A flaw detection device for bridge construction

Abstract

The present invention relates to the technical field of bridge flaw detection equipment, and specifically relates to a flaw detection equipment for bridge construction, including an equipment housing. An adapter box is fixedly installed at the front end of the equipment housing. Two tension wheels are rotatably installed at both the front and rear ends of the equipment housing. The outer surface of the tension wheels is sleeved through a crawler tensioner. A plurality of magnetic blocks are arranged inside both the front and rear ends of the equipment housing. The magnetic blocks can magnetize the steel structure below the equipment housing. The inner end of the equipment housing is fixedly installed with a support frame through bolts. A plurality of matching plates are arranged at the inner end of the support frame. A spraying device is arranged inside the matching plates. An angle adjustment device is arranged inside the adapter box. The present invention can flexibly adjust the nozzle angle according to the curvature of the bent steel member or the cylindrical steel structure, ensure that the magnetic powder evenly covers the entire surface, avoid detection blind spots caused by mismatched angles, avoid the problem of uneven magnetic powder distribution, improve the visualization effect of defect detection, and make the defects appear more clearly.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge flaw detection equipment, and particularly to a flaw detection device for bridge construction. Background Art

[0002] During the bridge construction process, the quality of concrete structures and steel structures is directly related to the safety and service life of the bridge. Due to the influence of factors such as vehicle loads, wind loads, temperature changes, and environmental corrosion during the long-term use of the bridge, internal materials may have damages such as cracks, pores, inclusions, and welding defects. If these defects cannot be discovered and repaired in time, it may lead to a decrease in the bearing capacity of the bridge structure and even safety accidents. Therefore, it is of great significance to conduct flaw detection on the materials and welding parts during the bridge construction process.

[0003] After retrieval, it is found that the prior art publication number is CN216462601U, which discloses a non-destructive flaw detection device for large steel frame welding, including a flaw detection device box body. Moving structures are installed at the front and rear ends of the lower side of the flaw detection device box body. A flaw detection arm is installed on one side of the flaw detection device box body. A transmission motor, a storage battery, and a single-chip microcomputer are installed inside the flaw detection device box body. An electromagnet is installed on the lower side of the flaw detection device box body. A second gear is installed at the outer end of the transmission motor. The moving structure includes a shaft rod. A shaft rod seat is installed on the outer surface of the shaft rod. Clamping wheels are installed at both ends of the shaft rod. This solution is provided with a transmission structure, a wheel width adjustment structure, and an electromagnet adsorption structure. After being fixedly matched with the steel beam, the weld flaw detection on a certain distance of the steel beam can be completed, and it can be adapted to flaw detection on steel beams of different widths.

[0004] Therefore, based on the above retrieval and in combination with the existing technology, in the existing solutions, when detecting curved steel beams and cylindrical steel structures, due to uneven coverage of the flaw detection area, some defects are often difficult to appear, affecting the detection accuracy. In addition, due to the complex shape of steel components, it is often necessary to manually adjust the spraying direction frequently, increasing the operation difficulty. Traditional magnetic particle flaw detection equipment is mainly applicable to horizontal or downward detection. For steel beams at the top of the bridge, suspended steel structures, and complex welding joints, it usually requires manual high-altitude operations or the erection of scaffolding, increasing the construction safety risk. At the same time, affected by gravity, the distribution of magnetic powder on the top steel structure is uneven, making it difficult to ensure the flaw detection quality, and the magnetic powder is easy to disperse, not only wasting materials but also possibly being accidentally inhaled by the operator, endangering health. For this reason, we propose a flaw detection device for bridge construction. Summary of the Invention

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

[0006] To achieve the above object, the present invention provides the following technical solution: A flaw detection device for bridge construction, including a device housing. A fitting box is fixedly installed at the front end of the device housing. Two tension wheels are rotatably installed at both the front and rear ends of the device housing. The outer surface of the tension wheels is sleeved by a crawler tension. A plurality of magnetic blocks are arranged inside both the front and rear ends of the device housing. The magnetic blocks can magnetize the steel structure below the device housing. The inner end of the device housing is fixedly installed with a support frame through bolts. A plurality of fitting plates are arranged at the inner end of the support frame. The plurality of fitting plates are rotatably connected to each other. And a spraying device for spraying magnetic powder is arranged inside the fitting plate. The sprayed magnetic powder adheres to the outer surface of the magnetized steel structure. An angle adjustment device capable of adjusting the rotation arc of the fitting plate is arranged inside the fitting box. According to the actual situation, the rotation angle of the fitting plate is changed to realize spraying magnetic powder on the outer surface of the steel structure with different arcs. The magnetic powder will concentrate on the defective parts, making the defects visible.

[0007] As a further scheme of the present invention, the angle adjustment device includes a grid. A plurality of height measuring strips are slidably installed at the inner end of the grid. The height measuring strips are all slidably connected to the inner end of the fitting box. A plurality of air delivery pumps are fixedly installed at the inner end of the fitting box. The extending end of the air delivery pump is fixedly connected to the height measuring strip. A locking rod penetrates through the inner end of the fitting box.

[0008] As a further scheme of the present invention, the locking rod is located on the right side of the grid. And a plurality of lock blocks are fixedly installed on the outer surface of the locking rod. A plurality of lock holes are opened at the right end of the height measuring strip. When the locking rod rotates, it drives the lock blocks to penetrate into the lock holes. A plurality of air bags are fixedly installed at the right end of the support frame. The air bags are located below the plurality of fitting plates. The air bags are connected to the air delivery pumps through air guide pipes.

[0009] As a further scheme of the present invention, the spraying device includes a material receiving pipe. The material receiving pipe is fixedly connected to the upper end of the fitting plate through bolts. A material conveying ring is slidably connected to the inner end of the material receiving pipe. An output pipe is fixedly connected to the outer surface of the material receiving pipe. And a fitting pipe penetrates through the inner end of the output pipe.

[0010] As a further scheme of the present invention, the fitting pipe and the output pipe are connected by an unlocking spring. A limit ring is fixedly installed at the bottom end of the fitting pipe. The limit ring is located below the output pipe, preventing the fitting pipe from detaching from the output pipe. Through the physical limitation of the limit ring, even during long-term operation or under external force, the fitting pipe can still be firmly connected inside the output pipe, preventing detachment due to vibration or pressure changes, and ensuring the continuous and stable operation of the flaw detection device.

[0011] As a further solution of the present invention, an upper lock cover is slidably connected to the upper end of the mating pipe. Both the front and rear ends of the left side of the upper lock cover are fixedly connected with passive rods. Triangular plates are slidably installed at both the front and rear ends of the output pipe. The triangular plates are fixedly connected with the material conveying ring, and the bottom end of the passive rod is slidably connected with the inclined plane of the triangular plate.

[0012] As a further solution of the present invention, a central rod is penetrated through the inner end of the mating pipe. A pushing plate is fixedly connected to the bottom end of the central rod. A squeezing spring is connected between the pushing plate and the mating pipe. A conical head is fixedly connected to the upper end of the central rod. A plurality of elastic plates are fixedly installed at the inner end of the mating pipe.

[0013] As a further solution of the present invention, one end of the elastic plate away from the mating pipe is clamped below the conical head, and a clamping plate is fixedly installed at the upper end of each elastic plate. A sleeve ring is fixedly connected to the inner bottom end of the upper lock cover, and the sleeve ring is sleeved on the outer surface of a plurality of clamping plates to realize the restriction of the elastic plate, prevent it from being deformed by external force at will, and further restrict the central rod to prevent the movement of the central rod.

[0014] As a further solution of the present invention, a magnetic powder box for loading magnetic powder is fixedly connected to the upper end of the equipment shell. A plurality of docking pipes are fixedly connected to the bottom end of the magnetic powder box. A plurality of spiral rods are rotatably installed at the inner end of the magnetic powder box, and the spiral rods respectively penetrate through the inside of the docking pipes. Through the spiral rod conveying structure, the magnetic powder can be evenly and continuously conveyed to the spraying device to prevent the magnetic powder from caking inside the magnetic powder box.

[0015] As a further solution of the present invention, a spray pipe for spraying magnetic powder is penetrated through the inner end of the mating plate. An air spray pipe is fixedly connected to the inner end of the spray pipe. An output rod is penetrated through the inner end of the air spray pipe. A turbofan is fixedly installed on the outer surface of the output rod. A discharging brush for crushing the caked magnetic powder is fixedly installed at the upper end of the output rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The present invention can flexibly adjust the nozzle angle according to the radian of the bent steel member or the cylindrical steel structure, ensure that the magnetic powder evenly covers the entire surface, avoid the detection blind area caused by the angle mismatch, avoid the problem of uneven magnetic powder distribution, improve the visualization effect of defect detection, and make the defects appear more clearly;

[0018] 2. The present invention can work in an inverted state, enabling flaw detection at positions such as the top of a bridge, suspended steel structures, and complex welding joints, adapting to more complex construction scenarios. It uses air flow 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 changes in the equipment angle. At the same time, the magnetic powder spraying process is entirely inside the equipment housing, which can avoid the problem of magnetic powder drifting and causing operators to accidentally inhale it into the mouth.

[0019] 3. The present invention is equipped with a discharge brush, which can prevent magnetic powder from caking at the nozzle during operation, ensure smooth air flow for transporting magnetic powder, avoid nozzle blockage, and improve the continuous working ability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a flaw detection device for bridge construction;

[0021] Figure 2 It is a schematic structural diagram inside the equipment housing;

[0022] Figure 3 It is a schematic structural diagram of the angle adjustment device;

[0023] Figure 4 It is an exploded view of the crawler and the magnetic block;

[0024] Figure 5 It is a schematic structural diagram inside the magnetic powder box;

[0025] Figure 6 It is a schematic structural diagram inside the support frame;

[0026] Figure 7 It is a schematic structural diagram of the positional relationship between the mating plate and the airbag;

[0027] Figure 8 It is a schematic structural diagram of the spraying device;

[0028] Figure 9 It is a schematic internal structure diagram of the material receiving pipe and the output pipe;

[0029] Figure 10 It is a schematic internal structure diagram of the mating pipe;

[0030] Figure 11 It is a schematic internal structure diagram of the injection pipe;

[0031] Figure 12 It is a simplified diagram of the process of the reset hook lifting the clamping plate.

[0032] In the figure: 1. Equipment housing; 2. Magnetic powder box; 3. Magnetic block; 4. Adapter box; 5. Air filling pump; 6. Grid;

[0033] 101, height measurement strip; 102, air duct; 103, air pump; 104, lock block; 105, locking rod;

[0034] 201, crawler belt; 202, tensioning wheel; 203, driven wheel; 204, abutting belt; 205, transmission rod; 206, drive disc; 207, reciprocating rod;

[0035] 301, drive motor; 302, worm; 303, worm gear; 304, extrusion plate; 305, screw rod; 306, docking pipe;

[0036] 401, support frame; 402, mating plate; 403, airbag; 404, guide plate;

[0037] 501, output pipe; 502, feeding pipe; 503, partition plate; 504, unlocking spring; 505, upper lock cover; 506, mating pipe; 507, passive rod; 508, triangular plate; 509, feeding ring; 510, collar; 511, blocking spring; 512, clamping plate; 513, elastic plate; 514, pushing plate; 515, squeezing spring; 516, central rod; 517, reset hook;

[0038] 601, injection pipe; 602, air delivery pipe; 603, spiral head; 604, unloading brush; 605, air jet pipe; 606, output rod. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Embodiment 1: Please refer to Figure 1 , a flaw detection device for bridge construction, including a device housing 1. The front end of the device housing 1 is fixedly installed with an adapter box 4 through bolts. A handle is rotatably installed on the outer surface of the device housing 1 to facilitate the operator to lift it better. And two handles are fixedly welded on the upper end of the device housing 1 to facilitate the operator to hold and further operate the device;

[0041] As Figure 2 - Figure 5As shown in the figure, two tension wheels 202 are rotatably installed at both the front and rear ends of the equipment housing 1. The outer surface of the tension wheel 202 is tightly sleeved by a crawler 201. The crawler 201 is made of rubber, and multiple anti-slip bumps are arranged on the outer surface to further reduce the phenomenon of slipping after contacting the metal outer surface. Multiple magnets 3 are arranged inside both the front and rear ends of the equipment housing 1. The magnets 3 can magnetize the steel structure below the equipment housing 1. The inner end of the equipment housing 1 is fixedly installed with a support frame 401 through bolts. Multiple mating plates 402 are arranged at the inner end of the support frame 401. The mating plates 402 are rotatably connected to each other through a rotating shaft, and a spraying device for spraying magnetic powder is arranged inside the mating plate 402. The sprayed magnetic powder adheres to the outer surface of the magnetic steel structure to check whether there are cracks on the outer surface of the steel structure;

[0042] As Figure 4 , specifically, there are multiple magnets 3, which are arranged inside the crawler 201, and two adjacent magnets 3 are slidably connected to each other. Among them, guide rails are arranged at the sliding connection parts of each magnet 3 to prevent the two approaching magnets 3 from attracting each other, resulting in the inability to move up and down independently. When the crawler 201 moves on the outer surface of the steel structure, the magnets 3 are adsorbed on the outer surface of the steel material under the action of magnetic force and are isolated by the crawler 201. The design of multiple magnets 3 is to ensure that when the crawler 201 passes through rough parts, there will be no phenomenon of tipping up, so that the magnets 3 are always adsorbed on the outer surface of the steel structure.

[0043] When it is necessary to detect the outer surface of a steel structure with a certain curvature, in order to make the magnetic powder spray more evenly, an angle adjustment device for adjusting the rotation angle of the mating plate 402 is arranged inside the adapter box 4. The rotation angle of the mating plate 402 is changed according to the actual situation to spray magnetic powder on the outer surface of the steel structure with different curvatures, so as to maximize the magnetic powder coverage efficiency. 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. Local magnetic force leakage will occur at the defect position, resulting in the deviation of magnetic force lines 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 detect the outer surface of the steel.

[0044] Please refer to Figure 3 、 Figure 6 、 Figure 7, the angle adjustment device includes a grid 6. A plurality of height measuring bars 101 are slidably installed at 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 at the inner end of the adapter box 4. The extending end of the air pump 103 is fixedly connected to the height measuring bar 101 by bolts. A locking rod 105 is inserted through the inner end of the adapter box 4. The locking rod 105 is located on the right side of the grid 6. 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, it drives the locking blocks 104 to penetrate into the locking holes 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, which is convenient for the operator to rotate the locking rod 105;

[0045] A plurality of air bags 403 are fixedly installed at the right end of the support frame 401. The air bags 403 are located below the plurality of mating plates 402 and are fixedly connected to them by an adhesive. A support plate is fixedly installed at the bottom end of the air bag 403, and the support plate is fixedly connected to the support frame 401, so that the air bag 403 will not extend downward when it expands. The air bag 403 is connected to the air pump 103 through a conduit 102. Specifically, fixed shafts are fixedly installed on the outer surfaces of the mating plates 402 at both ends. An activity groove is opened at the inner end of the support frame 401. The fixed shafts are inserted into the interior of the activity groove, so that the mating plates 402 at both ends can rotate and reciprocate;

[0046] More specifically, a part of air is pre-retained inside the air bag 403. If the height measuring bar 101 moves upward, the air pump 103 will deliver gas through the conduit 102 into the air bag 403 to make the air bag 403 expand, and then push up the mating plate 402 among them. Since the plurality of mating plates 402 are rotatably connected to each other, at this time, the connection state between the mating plates 402 presents a shape similar to an arc. Then when the height measuring bar 101 moves downward, the gas inside the air bag 403 will be pumped back into the air pump 103. At this time, the air bag 403 deflates and drives the mating plate 402 to move downward. At this time, the mutually rotatably connected mating plates 402 are in a concave arc shape to realize the detection of the outer surface of different planar steel structures.

[0047] Example 2: Please refer to Figure 2 、 Figure 5, A flaw detection device for bridge construction. Based on Example 1, a magnetic powder box 2 for loading magnetic powder is fixedly welded to the upper end of the equipment shell 1. A sealing cover is threadedly sleeved on the right end of the magnetic powder box 2. By unscrewing the sealing cover, a sufficient amount of magnetic powder can be added to the inside of the magnetic powder box 2 to enable continuous supply during the detection process. A plurality of docking pipes 306 are fixedly connected to the bottom end of the magnetic powder box 2. A plurality of spiral rods 305 are rotatably installed inside the magnetic powder box 2, and the spiral rods 305 are respectively inserted into the inside of the docking pipes 306. When the spiral rods 305 rotate, the magnetic powder inside the magnetic powder box 2 is transported to the inside of the docking pipes 306. Specifically, rotating rods are fixedly welded to the upper ends of the spiral rods 305, and worm wheels 303 are fixedly welded to the upper ends of the rotating rods. A worm 302 is rotatably installed inside the magnetic powder box 2, and the worm 302 meshes with the worm wheel 303. The left end of the magnetic powder box 2 is fixedly connected to a driving motor 301 by bolts, and the output end of the driving motor 301 is fixedly connected to the worm 302;

[0048] A pressing plate 304 is slidably connected to the inside of the magnetic powder box 2, and the rotating rod is inserted into the inside of the pressing plate 304. An air pump 5 is fixedly installed on the right end inside the equipment shell 1 by bolts. A jet head is fixedly connected to the upper end inside the magnetic powder box 2, and the jet head is connected to the output end of the air pump 5 through an air pipe. Subsequently, the output end of the air pump 5 outputs high-speed gas, which then sprays out from the jet head to push the pressing plate 304 to move and squeeze the magnetic powder inside the magnetic powder box 2, so as to realize continuous supply of magnetic powder when the equipment shell 1 is turned over to detect the outer surface of the steel structure.

[0049] As Figure 6 - Figure 10 shown, the spraying device includes a receiving pipe 502, which is fixedly connected to the upper end of the matching plate 402 by bolts. The upper end of the receiving pipe 502 is fixedly connected to the bottom end of the docking pipe 306. A feeding ring 509 is slidably connected to the inside of the receiving pipe 502. An output pipe 501 is fixedly connected to the outer surface of the receiving pipe 502, and a matching pipe 506 is inserted into the inside of the output pipe 501. The matching pipe 506 is connected to the output pipe 501 through a unlocking spring 504. A limiting ring is fixedly installed at the bottom end of the matching pipe 506, and the limiting ring is located below the output pipe 501 to further prevent the matching pipe 506 from disengaging from the output pipe 501. An upper locking cover 505 is slidably connected to the upper end of the matching pipe 506. Passive rods 507 are fixedly connected to the front and rear ends on the left side of the upper locking cover 505. Triangular plates 508 are slidably installed at the front and rear ends of the output pipe 501. The triangular plates 508 are fixedly connected to the feeding ring 509, and the bottom end of the passive rod 507 is slidably connected to the inclined plane of the triangular plate 508. A rhombic block is fixedly welded to the bottom end of the passive rod 507, and a rhombic groove is formed on the inclined plane of the triangular plate 508. The rhombic block is slidably connected in the rhombic groove, making it difficult for the passive rod 507 to fall off;

[0050] Then when the material feeding ring 509 moves to the right, and under the action of the sliding connection between the triangular plate 508 and the passive rod 507, the upper locking cover 505 moves upward. Specifically, the upper locking cover 505 can only move up and down a short distance at the upper end of the mating pipe 506. When the triangular plate 508 moves to the rightmost side of the output pipe 501, the passive rod 507 is pushed upward by the slope surface of the triangular plate 508, so that the mating pipe 506 moves to the topmost end of the output pipe 501. At this time, the material feeding ring 509 moves to directly below the mating pipe 506;

[0051] A central rod 516 is inserted through the inner end of the mating pipe 506. The bottom end of the central rod 516 is fixedly connected by bolts to a material pushing plate 514. The material pushing plate 514 and the mating pipe 506 are connected by an extrusion spring 515. Specifically, the elastic coefficient of the extrusion spring 515 is less than that of the unlocking spring 504. The upper end of the central rod 516 is fixedly welded with a conical head. A plurality of elastic plates 513 are fixedly installed at the inner end of the mating pipe 506. The elastic potential energy of the elastic plates 513 is less than the elastic force of the extrusion spring 515. And the end of the elastic plate 513 away from the mating pipe 506 is clamped below the conical head. Clamping plates 512 are fixedly installed at the upper ends of the elastic plates 513. A sleeve ring 510 is fixedly welded to the inner bottom end of the upper locking cover 505. And the sleeve ring 510 is sleeved on the outer surfaces of the plurality of clamping plates 512 to restrict the elastic plates 513, prevent them from being deformed by external forces randomly, and further restrict the central rod 516 to prevent the central rod 516 from moving further;

[0052] As Figure 10 、 Figure 12 shown, specifically, a plurality of reset hooks 517 are fixedly installed at the inner end of the sleeve ring 510, and the reset hooks 517 correspond to the clamping plates 512. Slots are opened at one ends of the clamping plates 512 close to the central rod 516.

[0053] As Figure 2 、 Figure 5 、 Figure 8As shown, more specifically, a plurality of passive wheels 203 are rotatably installed on both the front and rear sides of the inner end of the device housing 1. The outer surface of the passive wheels 203 is tightly sleeved through a contact belt 204. A plurality of grooves are formed on the outer surface of the contact belt 204. The contact belt 204 is attached to the outer surface of the crawler 201. The anti-slip protrusions on the outer surface of the crawler 201 are embedded in the grooves on the outer surface of the contact 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 through a bolt. The end of the transmission rod 205 away from the passive wheel 203 is fixedly welded to a driving disk 206. One end of the driving disk 206 away from the center of the circle is rotatably connected to a reciprocating rod 207 through a rotating shaft. Between two adjacent triangular plates 508, they are fixedly connected through a guiding plate 404. The guiding plate 404 is made of a bendable metal material and can bend following the rotation angle of the mating plate 402. The reciprocating rod 207 and the guiding plate 404 are connected through a universal joint. When the passive wheel 203 rotates, it drives the driving disk 206 to rotate through the transmission rod 205, and then drives the guiding plate 404 to reciprocate through the reciprocating rod 207.

[0054] Please refer to Figure 8 , Figure 11 , when the inner end of the mating plate 402 is provided with a spray pipe 601 for spraying magnetic powder. When the mating plate 402 rotates, the spray pipe 601 can follow and change the spraying angle. The inner end of the spray pipe 601 is fixedly connected to an air spray pipe 605. The outer surface of the air spray pipe 605 is fixedly connected to an air delivery pipe 602. The input end of the air delivery pipe 602 is fixedly connected to the output end of the air filling pump 5. The inner end of the air spray pipe 605 is provided with an output rod 606. A vortex fan is fixedly installed on the outer surface of the output rod 606. And a discharging brush 604 for crushing agglomerated magnetic powder is fixedly installed at the upper end of the output rod 606. The discharging brush 604 is located above the air spray pipe 605. A spiral head 603 is fixedly installed at the upper end of the output rod 606. When the agglomerated magnetic powder passes through the spiral head 603, the rotating spiral head 603 can quickly crush it;

[0055] As Figure 9 - Figure 11As shown in the figure, specifically, a notch of the same size as the spiral head 603 is provided at the right end of the material feeding ring 509, so that the material feeding ring 509 can move above the injection pipe 601 without resistance. A rectangular notch is provided at the upper right of the material feeding ring 509. After the material pushing plate 514 moves downward, the limit distance of the downward movement of the material feeding ring 509 will not exceed the height of the rectangular notch, avoiding damage to the device caused by the collision of the material pushing plate 514 by the material feeding ring 509. More specifically, a partition plate 503 is fixedly welded to the left end of the material feeding ring 509. After the material feeding ring 509 moves to the right, the partition plate 503 can block the material receiving pipe 502, preventing the magnetic powder inside the material receiving pipe 502 from reaching the left side of the material feeding ring 509, resulting in the failure of the material feeding ring 509 to return to its normal position. The length of the partition plate 503 is greater than the length of the output pipe 501.

[0056] The working principle of the present invention is:

[0057] During use, push the height measuring bar 101 to a suitable height, rotate the locking rod 105 by turning the knob, and fix the height measuring bar 101. At this time, between multiple matching plates 402, through the expansion and contraction of the airbag 403, a suitable arc is formed. Subsequently, place the device on the outer surface of the steel structure. Under the action of the attraction force, the magnet 3 tightly adheres the crawler 201 to the outer surface of the steel structure, and push the equipment shell 1 to move through the grip. The air filling pump 5 is started and enters the inside of the air injection pipe 605 through the air delivery pipe 602. As the air is ejected, the vortex fan on the outer surface of the air injection pipe 605 rotates rapidly, and drives the unloading brush 604 and the spiral head 603 to rotate;

[0058] When the equipment shell 1 moves, it drives the abutting belt 204 to rotate through the crawler 201. Subsequently, the abutting belt 204 drives the passive wheel 203 to rotate. When the passive wheel 203 rotates, it drives the driving disk 206 to rotate through the transmission rod 205, thereby realizing the reciprocating movement of the guide plate 404 driven by the reciprocating rod 207. Before that, as the spiral rod 305 inside the magnetic powder box 2 rotates, the magnetic powder is conveyed into the inside of the material feeding ring 509. After the magnetic powder is extruded, the gap between the magnetic powders becomes smaller, and a phenomenon of partial caking occurs. 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 material feeding ring 509 to move. At this time, the material feeding ring 509 transports the internal magnetic powder above the injection pipe 601;

[0059] When the triangular plate 508 moves, the passive rod 507 is pushed upward through the ramp surface. At this time, the upper locking cover 505 begins to move upward, and the mating tube 506 is pushed upward by the elastic force of the unlocking spring 504. At this time, the upward movement speed of the mating tube 506 is the same as that of the upper locking cover 505. When the limiting ring at the bottom end of the mating tube 506 contacts the inner end of the output tube 501, the movement process of the mating tube 506 at this time ends. However, the upper locking cover 505 will still move upward and drive the collar 510 to move upward, so that it disengages from the sleeved card plate 512;

[0060] Meanwhile, the material conveying ring 509 has become parallel to the mating tube 506 and the injection tube 601. At this time, the elastic force of the material extrusion spring 515 begins to be released, and it pushes the material pushing plate 514 to move downward, pushing the magnetic powder inside the material conveying ring 509 above the unloading brush 604. Subsequently, the agglomerated magnetic powder will be brushed off by the unloading brush 604. Then, under the action of the air flow, the magnetic powder can quickly adhere to the outer surface of the steel structure. Even when the equipment shell 1 is in the process of inspecting the steel structure upside down, the magnetic powder can still adhere to the outer surface of the steel structure, making the flaw detection process more convenient;

[0061] Then, when the material conveying ring 509 resets, the triangular plate 508 moves to the left and presses the upper locking cover 505 downward through the passive rod 507. At this time, as the upper locking cover 505 moves downward, it presses the elastic plate 513 downward by virtue of the blocking spring 511 (at this time, the elastic plate 513 and the card plate 512 are in an inclined state). The end of the elastic plate 513 away from the mating tube 506 moves downward. When the upper locking cover 505 moves downward, it also pushes the mating tube 506 downward (at this time, the collar 510 is above the card plate 512 but is not sleeved on the outer surface of the card plate 512). At this time, the elastic plate 513 gradually approaches the conical head above the central rod 516. Subsequently, the card plate 512 passes by the conical head. At this time, the card plate 512 is still in an inclined state (as Figure 12 shown), and at this time, the reset hook 517 has been clamped in the card slot on the outer surface of the card plate 512;

[0062] Subsequently, when waiting for the next upward movement of the collar 510, it pulls the card plate 512 to the vertical state through the reset hook 517. Immediately afterwards, the card plate 512 disengages from the reset hook 517. Subsequently, the collar 510 is sleeved on the outer surface of the card plate 512 again and clamps the conical head above the central rod 516 again. Then, the above steps are repeated to realize the process of continuously detecting the defects on the outer surface of the steel structure.

[0063] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes 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 the front and rear ends of the device shell (1); the outer surface of the tension wheel (202) is tensioned by a track (201); a plurality of magnetic blocks (3) are arranged inside 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 a plurality of A 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, and an angle adjustment device capable of adjusting the rotational arc of the matching plates (402) is arranged inside the adapter box (4), and the rotational angle of the matching plates (402) is adjusted according to actual conditions to spray magnetic powder on the outer surface of the steel structure with different arcs, and the magnetic powder is concentrated at the defective position, thereby making the defect visible; 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); 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).

2. 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).

3. A flaw detection device for bridge construction according to claim 2, 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 prevent the matching tube (506) from escaping from the output tube (501).

4. A flaw detection device for bridge construction according to claim 3, 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).

5. A flaw detection device for bridge construction according to claim 4, 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).

6. A flaw detection device for bridge construction according to claim 5, 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). A ring (510) is fixedly connected to the inner bottom end of the locking cover (505), 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).

7. A flaw detection device 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).

8. 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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