Bridge bottom surface crack detection device

Abstract

The invention discloses a bridge bottom surface crack detection device, and relates to the technical field of bridge detection, the bridge bottom surface crack detection device comprises a walking detection mechanism and a plurality of steel cable guide rail mechanisms, the steel cable guide rail mechanisms are arranged in the width direction of a bridge, and each steel cable guide rail mechanism comprises a steel cable frame, a steel cable and a fixing plate; the wire rope is wound on the wire spool, one end of the wire rope is fixedly connected with the fixing plate, the wire rope is wound through the wire spool and used for being in a tightened state, the walking detection mechanism comprises a walking base, a detection bottom plate and two imaging detection assemblies, the walking base is used for walking on the wire rope, and the bottom of the detection bottom plate is connected to the top of the walking base through a stand column; the imaging detection assembly comprises a detection box and an industrial camera, the detection box is slidably arranged on the top face of the detection bottom plate, a hollow detection pipe is fixed to the top of the detection box, the industrial camera is installed in the detection box, crack detection of the bottom face of the bridge is achieved, manual participation is not needed in the detection process, and detection data are more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of bridge detection, and in particular to a bridge bottom surface crack detection device. Background Art

[0002] During the use of bridges, cracks will appear on the main cement body of the bridge due to vibration, natural weather, external forces and other reasons. Regular inspection of bridge cracks helps to understand the operating status of the bridge and improve the safety of the bridge. Since the surface of the bridge can support the movement of the detection equipment, it is easier to detect cracks on the surface of the bridge. However, the formation of bridge cracks is not only on the surface of the bridge, but also on the bottom of the bridge. Since the bottom of the bridge cannot support the movement of the detection equipment, the bottom surface detection of the bridge is often ignored. Once a large crack is formed, the best time for bridge repair has been missed. Therefore, it is also very important to detect cracks on the bottom of the bridge. At present, there are mostly two types of inspections for the bottom surface of bridges. One is to use a hanging basket to perform manual inspection and manually collect image data of the bottom surface of the bridge, which requires the cooperation of multiple groups of personnel, has low efficiency, high labor costs, and high risks. The other is to use drones equipped with inspection equipment to collect images. Due to the large weight and size of the inspection equipment, the requirements for drones are high, and there is also a high cost problem. At the same time, the wind under the bridge is strong, and the drone does not fly steadily under the wind, and cannot stably collect clear image data, and is also prone to the risk of falling. Therefore, it is necessary to design a device specifically for crack detection on the bottom surface of bridges. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a bridge bottom surface crack detection device to solve the deficiencies of the prior art.

[0004] The objective of the present invention is achieved through the following technical solutions: a bridge bottom surface crack detection device, comprising a walking detection mechanism and a steel cable guide rail mechanism, wherein a plurality of the steel cable guide rail mechanisms are arranged along the width direction of the bridge, wherein the steel cable guide rail mechanism comprises a steel cable frame, a steel cable and a fixed plate, wherein the steel cable frame and the fixed plate are respectively fixed at two ends of the bridge, wherein a winding drum is rotatably provided on the steel cable frame, wherein the steel cable is wound on the winding drum, wherein one end of the steel cable is fixedly connected to the fixed plate, wherein the steel cable is wound by the winding drum, so as to keep the steel cable in a taut state, wherein the walking detection mechanism comprises a walking base, a detection base plate and two groups of imaging detection components, wherein an installation groove is provided at the bottom of the walking base, wherein an upper walking shaft and a lower walking shaft are rotatably provided in the installation groove, and wherein the upper walking shaft has a The walking base has the freedom to move in the height direction, a plurality of upper V-shaped wheels are mounted on the upper walking shaft, a plurality of lower V-shaped wheels are mounted on the lower walking shaft, each of the steel cables is correspondingly provided with an upper V-shaped wheel and a lower V-shaped wheel, the steel cables are located in the walking space formed by the upper V-shaped wheels and the lower V-shaped wheels, the bottom of the detection base plate is connected to the top of the walking base through a column, the imaging detection component includes a detection box and an industrial camera, the detection box is slidably arranged on the top surface of the detection base plate, the moving direction of the detection box is perpendicular to the length direction of the steel cable, a hollow detection tube is fixed on the top of the detection box, the industrial camera is installed in the detection box, the lens of the industrial camera extends into the hollow detection tube, and a transparent baffle is installed on the top of the hollow detection tube.

[0005] Furthermore, one of the steel cable guide rail mechanisms is provided with a walking drive mechanism, and the walking drive mechanism includes two groups of steel cable drive assemblies, and the two groups of steel cable drive assemblies are respectively arranged on the fixed plate and the steel cable frame, and the steel cable drive assembly includes a rotatably arranged winding roller, on which a driving steel cable is wound, one end of the driving steel cable is connected to the walking base, and one end of the winding roller is transmission-connected to the output shaft of the driving motor, and the two groups of steel cable drive assemblies, one of which reels in the driving steel cable and the other releases the driving steel cable to pull the walking detection mechanism to move.

[0006] Furthermore, the travel drive mechanism also includes a tensioning mechanism, which includes a tensioning frame, a guide frame and a hydraulic push rod. The tensioning frame has the freedom to move radially along the winding roller. The guide frame is fixedly connected to the steel cable frame. The tensioning frame is located between the winding roller and the guide frame in the vertical direction. The tensioning frame and the guide frame are respectively rotatably provided with a tensioning wheel and a fixed pulley. The driving steel cable passes around the tensioning wheel and the fixed pulley in turn to connect to the walking base. The cylinder body of the hydraulic push rod is installed on the steel cable frame, and the telescopic shaft of the hydraulic push rod is connected to the tensioning frame.

[0007] Furthermore, the tensioning mechanism also includes a tensioning detection component, which includes a fixed sleeve, a pressure sensor, a pressure plate and a sliding block. The fixed sleeve is fixedly installed on the steel cable frame, and the tensioning frame is located between the fixed sleeve and the hydraulic push rod. The end of the fixed sleeve close to the tensioning frame is provided with a detection groove in the horizontal direction, and the pressure sensor is installed in the detection groove. The detection shaft of the pressure sensor is in contact with the pressure plate, and the end of the pressure plate away from the pressure sensor is connected to a spring, and the spring is connected to the sliding block. The sliding block is slidably adapted to the detection groove, and the end of the sliding block away from the spring contacts the tensioning frame.

[0008] Furthermore, the upper walking shaft and the lower walking shaft are arranged in multiple equal intervals along the length direction of the steel cable, and the walking base is provided with an inner cavity at both ends of the upper walking shaft, a screw rod is rotatably installed in the inner cavity, a lifting slider is threadedly mounted on the screw rod, and the lifting slider is slidably adapted to the inner cavity, and a vertical slide groove is provided on the side wall of the walking base at a position corresponding to the screw rod, and the end of the upper walking shaft passes through the vertical slide groove and is rotatably connected to the lifting slider.

[0009] Furthermore, a driving cavity is provided above the inner cavity of the walking base, a driving spindle is rotatably installed in the driving cavity, the driving spindle is perpendicular to the screw rod, the top end of the screw rod movably penetrates into the driving cavity and is connected to a first bevel gear, the first bevel gear meshes with a second bevel gear, the second bevel gear is mounted on the driving spindle, a motor is installed on the side wall of the walking base, and the output shaft of the motor is transmission-connected to the driving spindle.

[0010] Furthermore, a screw groove is opened on the detection base plate along its length direction, and a bidirectional threaded screw is rotatably installed in the screw groove. The two thread segments of the bidirectional threaded screw with opposite thread rotation directions are both threadedly mounted with screw sliders, and the detection boxes in the two groups of imaging detection components are respectively installed on the two screw sliders.

[0011] Furthermore, a through hole is opened at the top of the hollow detection tube along its own axial direction, a pressure sensor a is installed in the detection box, a detection rod is fixed to the bottom of the transparent baffle, the detection rod is movable through the through hole to contact the pressure axis of the pressure sensor a, a limit ring is fixedly sleeved on the detection rod, and the limit ring is contacted and arranged on the inner top wall of the detection box.

[0012] Furthermore, a blowing mechanism and a cleaning mechanism are respectively provided on both sides of the hollow detection tube, the blowing mechanism comprises a fan and an arc-shaped sealing plate, the fan is installed in the detection box, the air outlet end of the fan is connected with an air duct, the air duct passes through the detection box and is connected to the arc-shaped sealing plate, an arc-shaped air cavity is provided in the arc-shaped sealing plate, a plurality of exhaust holes are provided on the end face of the arc-shaped sealing plate close to the hollow detection tube, the exhaust holes are connected to the arc-shaped air cavity, the air outlet path of the arc-shaped sealing plate acts on the top surface of the transparent baffle, the cleaning mechanism comprises a cleaning motor, a cleaning shaft and a cleaning plate, the cleaning motor is installed in the detection box, the cleaning shaft is rotatably connected to the detection box, the cleaning shaft is in a 7-shape, one end of the cleaning shaft is drivingly connected to the output shaft of the cleaning motor, the other end of the cleaning shaft is connected to the cleaning plate, and a wiping sponge is provided at the bottom of the cleaning plate.

[0013] Furthermore, both ends of the bottom of the walking base are provided with disassembly grooves, and detachable sliders are slidably arranged in the disassembly grooves. Both ends of the lower walking shaft are rotatably connected to the two detachable sliders, and the detachable sliders are connected to the walking base by bolts.

[0014] The beneficial effects of the present invention are: 1. The walking detection mechanism is supported by installing a steel cable, and the steel cable is tightened by a winding drum to reduce the shaking of the walking detection mechanism. The upper V-shaped wheel and the lower V-shaped wheel clamp the steel cable for walking, which has high stability and prevents the walking detection mechanism from tipping over and falling. The detection box can move along the width of the bridge, and cooperate with the walking base to have the freedom to walk along the length of the bridge, so that the industrial camera has a larger coverage area to complete the crack image acquisition of the bottom surface of the bridge and realize the crack detection of the bottom surface of the bridge. The detection process does not require human participation, with low cost, high safety, and more accurate detection data.

[0015] 2. The walking base is pulled by driving cables. Driving cables are connected at both ends of the moving direction of the walking base. One of the two driving cables is pulled and the other is reeled in. The pulling speed is greater than the reeling speed, thereby pulling the walking base forward and making the two driving cables in a taut state, making the walking base more stable and further reducing the shaking of the walking base under wind, so that the industrial camera can take clear and accurate images. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of a bridge bottom surface crack detection device of the present invention is shown in FIG. Figure 1 ; Figure 2 The structure of a bridge bottom surface crack detection device of the present invention is shown in FIG. Figure 2 ; Figure 3for Figure 2 Enlarged view of point A in the middle; Figure 4 It is a schematic diagram of the internal structure of a detection box in a bridge bottom surface crack detection device of the present invention; Figure 5 It is a structural schematic diagram of a walking base in a bridge bottom surface crack detection device of the present invention; Figure 6 This is a schematic diagram of the internal structure of a fixed sleeve in a bridge bottom surface crack detection device of the present invention; Figure 7 The structure of a bridge bottom surface crack detection device of the present invention is shown in FIG. Figure 3 ; Figure 8 The structure of a bridge bottom surface crack detection device of the present invention is shown in FIG. Figure 4 ; Fig. 9 The structure of a bridge bottom surface crack detection device of the present invention is shown in FIG. Figure 5 ; In the figure, 1-cable rack, 2-cable, 3-fixed plate, 4-winding drum, 5-walking base, 6-detection base plate, 7-installation slot, 8-upper walking shaft, 9-lower walking shaft, 10-upper V-shaped wheel, 11-lower V-shaped wheel, 12-column, 13-detection box, 14-industrial camera, 15-hollow detection tube, 16-transparent baffle, 17-winding roller, 18-driving cable, 19-driving motor, 20-tensioning frame, 21-guide frame, 22-hydraulic push rod, 23-tensioning wheel, 24-fixed pulley, 25-fixed sleeve, 26-pressure sensor, 27-pressure plate, 28-sliding block , 29-detection groove, 30-spring, 31-inner cavity, 32-screw, 33-lifting slider, 34-vertical slide groove, 35-drive cavity, 36-drive spindle, 37-first bevel gear, 38-second bevel gear, 39-motor, 40-screw groove, 41-bidirectional threaded screw, 42-screw slider, 43-through hole, 44-detection rod, 45-pressure sensor a, 46-limiting ring, 47-fan, 48-arc sealing plate, 49-air duct, 50-exhaust hole, 51-cleaning motor, 52-cleaning shaft, 53-cleaning plate, 54-disassembly groove, 55-removable slider. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0018] Embodiment 1 like Figures 1 to 9As shown, a bridge bottom surface crack detection device includes a walking detection mechanism and a steel cable guide mechanism. A plurality of steel cable guide mechanisms are arranged along the width direction of the bridge. The steel cable guide mechanism includes a steel cable frame 1, a steel cable 2 and a fixed plate 3. The steel cable frame 1 and the fixed plate 3 are respectively fixed at both ends of the bridge. A winding drum 4 is rotatably arranged on the steel cable frame 1. The steel cable 2 is wound on the winding drum 4. One end of the steel cable 2 is fixedly connected to the fixed plate 3. The steel cable 2 is wound by the winding drum 4 to keep the steel cable 2 in a taut state. The walking detection mechanism includes a walking base 5, a detection base plate 6 and two groups of imaging detection components. An installation groove 7 is provided at the bottom of the walking base 5. An upper walking shaft 8 and a lower walking shaft 9 are rotatably arranged in the installation groove 7. The upper walking shaft 8 has an automatic function of moving along the height direction of the walking base 5. According to the degree, a plurality of upper V-shaped wheels 10 are mounted on the upper walking shaft 8, a plurality of lower V-shaped wheels 11 are mounted on the lower walking shaft 9, each steel cable 2 is correspondingly provided with an upper V-shaped wheel 10 and a lower V-shaped wheel 11, the steel cable 2 is located in the walking space formed by the upper V-shaped wheel 10 and the lower V-shaped wheel 11, the bottom of the detection base plate 6 is connected to the top of the walking base 5 through a column 12, the imaging detection component includes a detection box 13 and an industrial camera 14, the detection box 13 is slidably arranged on the top surface of the detection base plate 6, the moving direction of the detection box 13 is perpendicular to the length direction of the steel cable 2, a hollow detection tube 15 is fixed on the top of the detection box 13, the industrial camera 14 is installed in the detection box 13, the lens of the industrial camera 14 extends into the hollow detection tube 15, and the top of the hollow detection tube 15 is installed with Transparent baffle 16, multiple upper walking shafts 8 and lower walking shafts 9 are correspondingly arranged, and multiple upper walking shafts 8 and multiple lower walking shafts 9 are arranged at equal intervals along the length direction of the steel cable 2 to form multiple walking matching positions, so that the walking of the walking detection mechanism is more stable. The steel cable frame 1 and the fixed plate 3 are both fixed to the soil layer at both ends of the bridge by anchor casting, one end of the steel cable 2 is connected to the fixed plate 3, and the other end is wound on the winding drum 4. The steel cable 2 is wound or lowered by the winding drum 4, so that the length of the steel cable 2 is adapted to the length of the bridge. The steel cable 2 passes between the upper V-shaped wheel 10 and the lower V-shaped wheel 11, and the steel cable 2 is wound by the winding drum 4, so that the steel cable 2 is in a taut state, which greatly reduces the shaking of the steel cable 2, so that the shaking of the walking detection mechanism is smaller when walking, and the upper walking shaft 8 is turned to The upper V-shaped wheel 10 and the lower V-shaped wheel 11 are moved closer to the lower walking shaft 9, so that the upper V-shaped wheel 10 and the lower V-shaped wheel 11 contact the steel cable 2, so that the walking base 5 is installed on the steel cable 2 by clamping the steel cable 2, so that the walking base 5 can walk on the steel cable 2 while avoiding the walking base 5 from falling off the steel cable 2. Two groups of imaging detection components are arranged on the detection base plate 6. The moving directions of the detection boxes 13 in the two groups of imaging detection components are opposite, so that the two detection boxes 13 are symmetrically arranged on the detection base plate 6, so that the force is more uniform, which can effectively reduce the shaking of the walking base 5. The detection box 13 drives the industrial camera 14 to move along the width direction of the bridge. The two industrial cameras 14 jointly collect images of the bottom surface of the bridge, which improves the collection efficiency. When the image collection of this area is completed,The walking base 5 drives the detection box 13 to move forward for a distance and then stops. Then the detection box 13 drives the industrial camera 14 to collect images again. The image collection of the bottom surface of the bridge is completed in this cycle. By analyzing the information on the image, it is determined whether there are cracks on the bottom surface of the bridge, so that the cracks can be repaired in time. The entire detection process is automatic, with high efficiency, low shaking amplitude, high image acquisition efficiency, more accurate detection results, and lower cost. Secondly, the transparent baffle 16 is used to prevent dust or stones from entering the hollow detection tube 15 from the bottom of the bridge, which can well protect the industrial camera 14 from being affected during the detection process. In specific implementation, the winding drum 4 is driven by a brake motor and has a strong self-locking ability, which can keep the steel cable 2 taut.

[0019] Furthermore, if Figures 1 to 5 As shown, both ends of the bottom of the walking base 5 are provided with disassembly grooves 54, and a detachable slider 55 is slidably arranged in the disassembly groove 54. The two ends of the lower walking shaft 9 are rotatably connected to the two detachable sliders 55, and the detachable slider 55 is connected to the walking base 5 by bolts. The detachable slider 55 is conveniently installed through the setting of the detachable slider 55, and then the walking detection mechanism is conveniently installed on the steel cable 2. The specific installation method is: first install the installation of the steel cable guide mechanism, and then install the walking detection mechanism, unscrew the bolts to remove the detachable slider 55 and the lower walking shaft 9, and then place the walking base 5 on the steel cable 2, so that the steel cable 2 is located in the V-shaped groove of the upper V-shaped wheel 10, and then install the lower walking shaft 9, fix the detachable slider 55 on the walking base 5 by bolts, and make the lower V-shaped wheel 11 cooperate with the upper V-shaped wheel 10 to clamp the steel cable 2 to complete the installation; when disassembling, first remove the detachable slider 55, then the steel cable 2 on the walking base 5 can be removed, and finally the steel cable guide mechanism can be disassembled, which is simple to operate and has high reliability.

[0020] Embodiment 2 In order to further reduce the shaking of the walking detection mechanism during walking, based on the first embodiment, as Figures 1 to 3As shown, a travel drive mechanism is arranged on one of the steel cable guide rail mechanisms, and the travel drive mechanism includes two sets of steel cable drive components, and the two sets of steel cable drive components are respectively arranged on the fixed plate 3 and the steel cable frame 1, and the steel cable drive component includes a rotatably arranged winding roller 17, and a driving steel cable 18 is wound on the winding roller 17, and one end of the driving steel cable 18 is connected to the travel base 5, and one end of the winding roller 17 is transmission-connected to the output shaft of the driving motor 19, and one of the two sets of steel cable drive components reels the driving steel cable 18, and the other releases the driving steel cable 18 to pull the travel detection mechanism to move, and the travel drive mechanism also includes a tensioning mechanism, and the tensioning mechanism The tensioning frame 20 comprises a tensioning frame 20, a guide frame 21 and a hydraulic push rod 22. The tensioning frame 20 has the freedom to move radially along the winding roller 17. The guide frame 21 is fixedly connected to the steel cable frame 1. The tensioning frame 20 is located between the winding roller 17 and the guide frame 21 in the vertical direction. The tensioning frame 20 and the guide frame 21 are respectively provided with a tensioning wheel 23 and a fixed pulley 24 for rotation. The driving steel cable 18 sequentially passes around the tensioning wheel 23 and the fixed pulley 24 to connect to the walking base 5. The cylinder body of the hydraulic push rod 22 is installed on the steel cable frame 1. The telescopic shaft of the hydraulic push rod 22 is connected to the tensioning frame 20. The walking base 5 is moved forward by dragging. The driving cable 18 that guides the walking base 5 to move forward is in a taut state through a tensioning mechanism, and the two sets of cable driving components cooperate with each other to realize the movement of the walking base 5, one of which drives the winding roller 17 to reel in the driving cable 18 and drags the walking base 5 forward, and the other driving motor 19 drives the winding roller 17 to lower the driving cable 18, so that the walking base 5 can move forward smoothly, and the winding speed is slightly greater than the lowering speed, so that the lowered driving cable 18 is in a taut state, so that both driving cables 18 are in a taut state, so that the walking base 5 moves forward in a dragging manner, and the driving cables 18 are in a taut state. The cable 18 is parallel to the steel cable 2, so that the driving walking path of the walking base 5 is a straight line, further reducing the shaking of the walking base 5, and controlling the shaking amplitude within the working range of the industrial camera 14, so that it can produce a clear image; the tensioning operation process is: when the walking base 5 stops and the industrial camera 14 performs image acquisition, the hydraulic push rod 22 pushes the tensioning wheel 23 to move, so that the tensioning wheel 23 tightens the driving steel cables 18 at both ends of the walking base 5. After the driving steel cables at both ends are tightened, the walking base 5 can be well limited, which greatly reduces the shaking amplitude of the walking base 5 and realizes the automatic acquisition of cracks on the bottom surface of the bridge.

[0021] Embodiment 3 Due to the processing error of the driving cable 18 and the operating error of the driving motor 19, the operating value set by the hydraulic push rod 22 may not guarantee the tension of the driving cable 18. Therefore, it is very important to automatically tension the driving cable 18 in real time. For this purpose, based on the second embodiment, as shown in FIG. Figures 1 to 6As shown, the tensioning mechanism also includes a tensioning detection component, which includes a fixed sleeve 25, a pressure sensor 26, a pressure plate 27 and a sliding block 28. The fixed sleeve 25 is fixedly installed on the steel cable rack 1, and the tensioning frame 20 is located between the fixed sleeve 25 and the hydraulic push rod 22. The end of the fixed sleeve 25 close to the tensioning frame 20 is provided with a detection groove 29 in the horizontal direction. The pressure sensor 26 is installed in the detection groove 29. The detection shaft of the pressure sensor 26 is contacted with a pressure plate 27. The end of the pressure plate 27 away from the pressure sensor 26 is connected to a spring 30. The spring 30 is connected to the sliding block 28. The sliding block 28 is slidably adapted to the detection groove 29. The end of the sliding block 28 away from the spring 30 contacts the tensioning frame 20. The hydraulic push rod 22 pushes the tensioning frame 20 to always act on the sliding block 28. The sliding block 28 compresses the spring 30, and the reaction force of the spring 30 acts on the pressure plate 27. On the plate 27, the pressure plate 27 acts on the pressure axis of the pressure sensor 26 to generate a pressure value, and the pressure value of the pressure sensor 26 is set. When the pressure value of the pressure plate 27 acting on the pressure sensor 26 is less than the preset value, the hydraulic push rod 22 pushes the tensioning frame 20 to continue to squeeze the sliding block 28, and the sliding block 28 moves the compression spring 30, so that the tensioning wheel 23 tightens the driving cable 18 until the pressure value detected by the pressure sensor 26 is equal to the preset value. The hydraulic push rod 22 stops, and the image acquisition work is performed at this time. Even if there is an error between the driving cable 18 and the driving motor 19, the pressure sensor 26 can monitor the tensioning pressure state of the driving cable 18 in real time to adjust it in real time, and the tensioning value of the driving cable 18 is greater than the error of the driving cable 18, so that the driving cable 18 can still maintain a strong tension state, so as to greatly reduce the shaking amplitude of the walking base 5.

[0022] Embodiment 4 Based on the third embodiment, Figures 1 to 5As shown, the upper walking shaft 8 and the lower walking shaft 9 are arranged at equal intervals along the length direction of the steel cable 2, and the walking base 5 is provided with an inner cavity 31 at both ends of the upper walking shaft 8, and a screw rod 32 is rotatably installed in the inner cavity 31, and a lifting slider 33 is threadedly sleeved on the screw rod 32, and the lifting slider 33 is slidably adapted to the inner cavity 31, and a vertical slide groove 34 is opened on the side wall of the walking base 5 at the position corresponding to the screw rod 32, and the end of the upper walking shaft 8 passes through the vertical slide groove 34 and is rotatably connected to the lifting slider 33, and the walking base 5 is provided with a driving cavity 35 above the inner cavity 31, and a driving main shaft 36 is rotatably installed in the driving cavity 35, and the driving main shaft 36 is perpendicular to the screw rod 32, and the top end of the screw rod 32 movably penetrates into the driving cavity 35 and is connected to a first bevel gear 37, and the first bevel gear 37 meshes with the second bevel gear 38, and the second bevel gear 38 is sleeved on the driving main shaft 36, a motor 39 is installed on the side wall of the walking base 5, and the output shaft of the motor 39 is connected to the driving main shaft 36. When all the steel cables 2 are inserted between the corresponding upper V-shaped wheels 10 and the lower V-shaped wheels 11, the motor 39 drives the driving main shaft 36 to rotate, and the driving main shaft 36 drives the screw rod 32 to rotate through the engagement of the first bevel gear 37 and the second bevel gear 38. Since the lifting slider 33 slides and fits in the inner cavity 31, the rotational freedom is limited, so that the lifting slider 33 moves linearly along the axial direction of the screw rod 32, and the lifting slider 33 drives all the upper walking shafts 8 to move downward close to the lower walking shaft 9, so that the upper V-shaped wheel 10 and the lower V-shaped wheel 11 clamp the steel cable 2, thereby stably installing the walking base 5 on the steel cable 2, and the rotation of the upper walking shaft 8 and the lower walking shaft 9 enables the walking base 5 to walk on the steel cable 2 to collect the crack image of the bottom surface of the bridge.

[0023] Furthermore, a screw groove 40 is provided on the detection base plate 6 along its length direction, and a bidirectional threaded screw 41 is rotatably installed in the screw groove 40. The two thread segments of the bidirectional threaded screw 41 with opposite thread rotation directions are threadedly mounted with screw sliders 42. The detection boxes 13 in the two groups of imaging detection components are respectively installed on the two screw sliders 42. A screw motor is installed at one end of the detection base plate 6. The output shaft of the screw motor is connected to the bidirectional threaded screw 41, and the bidirectional threaded screw 41 is driven to rotate by the screw motor. Since the threads on the two screw sliders 42 have opposite rotation directions, the moving directions of the two screw sliders 42 are opposite, thereby making the moving directions of the two detection boxes 13 opposite. The two industrial cameras 14 move from the middle position of the bridge to both sides for image acquisition, which improves the acquisition efficiency, makes the force on the walking base 5 more uniform, and reduces the shaking amplitude.

[0024] Embodiment 5 During the detection process, dust and soil on the bottom surface of the bridge will fall on the transparent baffle 16, which will cause the image acquisition to be blocked and affect the effect of image acquisition. Therefore, based on the fourth embodiment, as shown in FIG. Figures 1 to 4As shown, a through hole 43 is formed on the top of the hollow detection tube 15 along its axial direction, a pressure sensor a45 is installed in the detection box 13, a detection rod 44 is fixed to the bottom of the transparent baffle 16, the detection rod 44 moves through the through hole 43 to contact the pressure axis of the pressure sensor a45, a limit ring 46 is fixedly sleeved on the detection rod 44, and the limit ring 46 is contacted and arranged on the inner top wall of the detection box 13, and a blower mechanism and a cleaning mechanism are respectively arranged on both sides of the hollow detection tube 15, the blower mechanism includes a fan 47 and an arc-shaped sealing plate 48, the fan 47 is installed in the detection box 13, and the fan 47 The air outlet end is connected with an air duct 49, and the air duct 49 passes through the detection box 13 and is connected to the arc-shaped sealing plate 48. An arc-shaped air cavity is arranged in the arc-shaped sealing plate 48. A plurality of exhaust holes 50 are opened on the end surface of the arc-shaped sealing plate 48 close to the hollow detection tube 15. The exhaust holes 50 are connected to the arc-shaped air cavity. The air outlet path of the arc-shaped sealing plate 48 acts on the top surface of the transparent baffle 16. The cleaning mechanism includes a cleaning motor 51, a cleaning shaft 52 and a cleaning plate 53. The cleaning motor 51 is installed in the detection box 13, and the cleaning shaft 52 is rotatably connected to the detection box 13. The cleaning shaft 52 is 7-shaped, and one end of the cleaning shaft 52 is connected to the cleaning motor 5 1 is connected to the output shaft of the cleaning shaft 52, and the other end of the cleaning shaft 52 is connected to the cleaning plate 53. A wiping sponge is arranged at the bottom of the cleaning plate 53. The fan 47 passes the wind into the arc-shaped wind cavity through the wind pipe 49, and then blows it out from the exhaust hole 50. The dust falling on the transparent baffle 16 is blown down by blowing, so as to ensure that the dust does not block the image acquisition of the industrial camera 14. When soil or stones fall on the transparent baffle 16, the soil or stones cannot be blown down by blowing. At this time, the soil or stones will cause the transparent baffle 16 to squeeze the pressure sensor a45, and the feedback signal value of the pressure sensor a45 is set. If the pressure is greater than the feedback signal value, the air cannot blow the debris off, while the pressure value is less than the feedback signal value, the debris on the transparent baffle 16 can be blown off. When the actual pressure value is greater than the feedback signal value, the cleaning mechanism starts, and the cleaning motor 51 drives the cleaning shaft 52 to rotate, so that the cleaning shaft 52 drives the cleaning plate 53 to rotate. During the rotation of the cleaning plate 53, the wiping sponge will be driven to wipe the transparent baffle 16 in a circular manner. While removing the impurities on the transparent baffle 16, the dust adhering to the transparent baffle 16 can also be wiped off, thereby ensuring the cleanliness of the transparent baffle 16 and ensuring that the image acquisition is not affected by debris.

Claims

1. A bridge bottom surface crack detection device, characterized in that: The invention comprises a walking detection mechanism and a steel cable guide mechanism, wherein a plurality of the steel cable guide mechanisms are arranged along the width direction of the bridge, wherein the steel cable guide mechanism comprises a steel cable frame (1), a steel cable (2) and a fixing plate (3), wherein the steel cable frame (1) and the fixing plate (3) are respectively fixed at two ends of the bridge, wherein a winding drum (4) is rotatably arranged on the steel cable frame (1), wherein the steel cable (2) is wound on the winding drum (4), wherein one end of the steel cable (2) is fixedly connected to the fixing plate (3), wherein the steel cable (2) is wound through the winding drum (4) so ​​as to put the steel cable (2) in a taut state, wherein the walking detection mechanism comprises a walking base (5), a detection base plate (6) and two groups of imaging detection components, wherein a mounting groove (7) is provided at the bottom of the walking base (5), wherein an upper walking shaft (8) and a lower walking shaft (9) are rotatably arranged in the mounting groove (7), wherein the upper walking shaft (8) has the degree of freedom to move along the height direction of the walking base (5), and wherein a plurality of An upper V-shaped wheel (10), a plurality of lower V-shaped wheels (11) are mounted on the lower walking shaft (9), each of the steel cables (2) is provided with a corresponding upper V-shaped wheel (10) and a lower V-shaped wheel (11), the steel cables (2) are located in a walking space formed by the upper V-shaped wheels (10) and the lower V-shaped wheels (11), the bottom of the detection base plate (6) is connected to the top of the walking base (5) via a column (12), and the imaging detection component comprises a detection box (13) and an industrial camera (14), the detection box (13) is slidably arranged on the top surface of the detection base plate (6), the moving direction of the detection box (13) is perpendicular to the length direction of the steel cable (2), a hollow detection tube (15) is fixed on the top of the detection box (13), the industrial camera (14) is installed in the detection box (13), the lens of the industrial camera (14) extends into the hollow detection tube (15), and a transparent baffle (16) is installed on the top of the hollow detection tube (15).

2. A bridge bottom surface crack detection device according to claim 1, characterized in that: A travel drive mechanism is arranged on one of the steel cable guide rail mechanisms, and the travel drive mechanism comprises two groups of steel cable drive assemblies, and the two groups of steel cable drive assemblies are respectively arranged on the fixed plate (3) and the steel cable frame (1), and the steel cable drive assembly comprises a rotatably arranged winding roller (17), and a driving steel cable (18) is wound on the winding roller (17), one end of the driving steel cable (18) is connected to the travel base (5), and one end of the winding roller (17) is transmission-connected to the output shaft of the driving motor (19), and one of the two groups of steel cable drive assemblies winds up the driving steel cable (18) and the other releases the driving steel cable (18) to pull the travel detection mechanism to move.

3. A bridge bottom surface crack detection device according to claim 2, characterized in that: The travel drive mechanism further comprises a tensioning mechanism, which comprises a tensioning frame (20), a guide frame (21) and a hydraulic push rod (22); the tensioning frame (20) has the freedom to move radially along the winding roller (17); the guide frame (21) is fixedly connected to the steel cable frame (1); the tensioning frame (20) is located between the winding roller (17) and the guide frame (21) in the vertical direction; a tensioning wheel (23) and a fixed pulley (24) are rotatably provided on the tensioning frame (20) and the guide frame (21), respectively; the driving steel cable (18) passes through the tensioning wheel (23) and the fixed pulley (24) in sequence to connect to the travel base (5); the cylinder body of the hydraulic push rod (22) is mounted on the steel cable frame (1); and the telescopic shaft of the hydraulic push rod (22) is connected to the tensioning frame (20).

4. A bridge bottom surface crack detection device according to claim 3, characterized in that: The tensioning mechanism further comprises a tensioning detection component, which comprises a fixing sleeve (25), a pressure sensor (26), a pressure plate (27) and a sliding block (28). The fixing sleeve (25) is fixedly mounted on the steel cable rack (1). The tensioning frame (20) is located between the fixing sleeve (25) and the hydraulic push rod (22). An end of the fixing sleeve (25) close to the tensioning frame (20) is provided with a detection groove (29) in a horizontal direction. The pressure sensor (26) is mounted in the detection groove (29). A detection shaft of the pressure sensor (26) is provided in contact with the pressure plate (27). An end of the pressure plate (27) away from the pressure sensor (26) is connected to a spring (30). The spring (30) is connected to the sliding block (28). The sliding block (28) is slidably adapted to the detection groove (29). An end of the sliding block (28) away from the spring (30) contacts the tensioning frame (20).

5. The bridge bottom surface crack detection device according to claim 1, characterized in that: A plurality of upper walking shafts (8) and lower walking shafts (9) are arranged at equal intervals along the length direction of the steel cable (2); the walking base (5) is provided with inner cavities (31) at both ends of the upper walking shaft (8); a screw rod (32) is rotatably installed in the inner cavity (31); a lifting slider (33) is threadedly sleeved on the screw rod (32); the lifting slider (33) is slidably adapted to the inner cavity (31); a vertical slide groove (34) is provided on the side wall of the walking base (5) at a position corresponding to the screw rod (32); an end of the upper walking shaft (8) passes through the vertical slide groove (34) and is rotatably connected to the lifting slider (33).

6. A bridge bottom surface crack detection device according to claim 5, characterized in that: The walking base (5) is provided with a driving cavity (35) above the inner cavity (31), a driving main shaft (36) is rotatably installed in the driving cavity (35), the driving main shaft (36) is perpendicular to the screw rod (32), the top end of the screw rod (32) movably penetrates into the driving cavity (35) and is connected to a first bevel gear (37), the first bevel gear (37) meshes with a second bevel gear (38), the second bevel gear (38) is sleeved on the driving main shaft (36), and a motor (39) is installed on the side wall of the walking base (5), the output shaft of the motor (39) is drivingly connected to the driving main shaft (36).

7. A bridge bottom surface crack detection device according to claim 1, characterized in that: The detection base plate (6) is provided with a screw groove (40) extending through it along its length direction, a bidirectional threaded screw (41) is rotatably mounted in the screw groove (40), two threaded sections of the bidirectional threaded screw (41) with opposite thread rotation directions are both threadedly sleeved with screw sliders (42), and the detection boxes (13) in the two groups of imaging detection assemblies are respectively mounted on the two screw sliders (42).

8. The bridge bottom surface crack detection device according to claim 1, characterized in that: A through hole (43) is formed on the top of the hollow detection tube (15) along its axial direction, a pressure sensor a (45) is installed in the detection box (13), a detection rod (44) is fixed to the bottom of the transparent baffle (16), the detection rod (44) is movable through the through hole (43) to contact the pressure axis of the pressure sensor a (45), a limit ring (46) is fixedly sleeved on the detection rod (44), and the limit ring (46) is arranged to contact the inner top wall of the detection box (13).

9. A bridge bottom surface crack detection device according to claim 8, characterized in that: A blowing mechanism and a cleaning mechanism are respectively provided on both sides of the hollow detection tube (15), the blowing mechanism comprising a blower (47) and an arc-shaped sealing plate (48), the blower (47) being installed in the detection box (13), the air outlet end of the blower (47) being connected to an air duct (49), the air duct (49) passing through the detection box (13) and being connected to the arc-shaped sealing plate (48), an arc-shaped air cavity being provided in the arc-shaped sealing plate (48), a plurality of exhaust holes (50) being provided on the end surface of the arc-shaped sealing plate (48) close to the hollow detection tube (15), the exhaust holes (50) being connected to the arc-shaped air cavity, The air outlet path of the arc-shaped sealing plate (48) acts on the top surface of the transparent baffle (16); the cleaning mechanism comprises a cleaning motor (51), a cleaning shaft (52) and a cleaning plate (53); the cleaning motor (51) is installed in the detection box (13); the cleaning shaft (52) is rotatably connected to the detection box (13); the cleaning shaft (52) is in a 7-shape; one end of the cleaning shaft (52) is drivingly connected to the output shaft of the cleaning motor (51); the other end of the cleaning shaft (52) is connected to the cleaning plate (53); and a wiping sponge is arranged at the bottom of the cleaning plate (53).

10. The bridge bottom surface crack detection device according to claim 1, characterized in that: Both ends of the bottom of the walking base (5) are provided with disassembly grooves (54), and removable sliders (55) are slidably arranged in the disassembly grooves (54). Both ends of the lower walking shaft (9) are rotatably connected to the two removable sliders (55), and the removable sliders (55) are connected to the walking base (5) via bolts.

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