Bridge crack detection device

Abstract

The present invention relates to the technical field of bridge detection, and in particular to a bridge crack detection device, comprising a roller, a push rod and a scanning mechanism, wherein the roller is arranged to rotate around a first axis and is disposed below the bridge, and the roller is always in rolling contact with the lower surface of the bridge, and the extension direction of the first axis is consistent with the length direction of the bridge; the push rod is arranged to rotate around the first axis, the push rod is rotationally connected to the roller, and the push rod can slide in the radial direction of the roller, and the end of the push rod away from the first axis is always slidingly connected to the lower surface of the bridge, and the scanning mechanism is used to detect the bridge in the radial direction of the roller where the push rod is located. Through the coordinated arrangement of the roller and the bridge, the roller can move on the bridge in a direction perpendicular to the length direction of the bridge, and the scanning mechanism can detect the bridge on the path; when the scanning mechanism moves with the push rod, the distance between the scanning mechanism and the detected bridge remains basically unchanged, and the data measured by the scanning mechanism is relatively accurate.

Description

Technical Field

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

[0002] Cracks are a very common and representative type of bridge structural defect. Extensive data indicates that the vast majority of bridge defects are closely related to the initiation and development of cracks, with approximately 76% of bridge defects attributable to cracks.

[0003] However, current methods for detecting cracks on bridge undersides, both domestically and internationally, face numerous limitations. Traditional inspection methods primarily rely on large-scale mechanical equipment, such as lifting inspection vehicles, hanging basket inspection vehicles, and truss-type inspection vehicles. These vehicles carry inspectors who conduct direct visual observation of the bridge underside or manually operate small equipment to record crack information. This inspection model faces a series of challenges: First, the high cost of inspection. The purchase, maintenance, operation, and labor costs of large-scale equipment contribute to the high overall cost of inspection projects. Second, the equipment itself is often bulky and heavy, making transportation and operation extremely inconvenient, reducing the flexibility and efficiency of inspection work. Third, inspectors operate at high altitudes or in complex environments, posing significant risks to their personal safety. Finally, the quality of inspection results depends largely on subjective factors such as the inspector's professionalism, experience, and attention, making it difficult to ensure the accuracy, consistency, and stability of inspection data, and prone to missed detections and misjudgments. Summary of the Invention

[0004] Based on this, it is necessary to provide a bridge crack detection device to address the problems of large size, high cost of use, high risk for inspectors when operating the detection device, and low accuracy and consistency of detection results.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A bridge crack detection device is used to detect the surface of a flat bridge and a bridge with reinforcing ribs, and includes a driving mechanism, a measuring mechanism, a scanning mechanism and a supporting mechanism. The driving mechanism is slidingly arranged on the bridge along the length direction of the bridge. The measuring mechanism includes a roller, a push rod, a first power assembly and a second power assembly. The roller is rotated around a first axis and is arranged below the bridge, and the roller is always in rolling contact with the lower surface of the bridge. The extension direction of the first axis is consistent with the length direction of the bridge; the push rod is rotated around the first axis, the push rod is rotationally connected to the roller, and the push rod can slide along the radial direction of the roller. The length of the push rod extends along its sliding direction, and the end of the push rod away from the first axis is always slidingly connected to the lower surface of the bridge. The first power assembly is used to drive the roller to rotate around the first axis; the second power assembly is used to drive the push rod to slide on the lower surface of the bridge; the scanning mechanism is arranged on the push rod, and the scanning mechanism is used to detect the bridge over which the push rod slides; the supporting mechanism is used to enable the measuring mechanism to move with the driving mechanism.

[0007] The measuring mechanism has a first state and a second state. In the first state, the line connecting the contact position between the roller and the bridge and the contact position between the top rod and the bridge extends along the length direction of the bridge, the first power assembly and the second power assembly work simultaneously, and the distance moved by the top rod on the bridge is consistent with the distance moved by the roller on the bridge; in the second state, there is one and only one contact position between the roller and the bridge, and an angle is set between the extension direction of the line connecting the contact position between the roller and the bridge and the contact position between the top rod and the bridge and the length direction of the bridge, and the first power assembly stops working.

[0008] Preferably, the supporting mechanism includes a vertical rod, a horizontal rod and an abutment portion, one end of the vertical rod is connected to the driving mechanism, the horizontal rod is arranged at the end of the vertical rod away from the driving mechanism, and the horizontal rod is horizontally arranged below the bridge, the horizontal rod extends along a first direction, the first direction is the width direction of the bridge, and the abutment portion is slidably arranged on the horizontal rod along the first direction, for making the roller abut against the bridge, and at the same time providing resistance for the roller to move in the opposite direction when it moves forward on the bridge.

[0009] Preferably, there are two driving mechanisms, which are located on both sides of the bridge in the width direction, and there are two vertical rods, which are respectively connected to the two ends of the cross rod, and the two vertical rods correspond one-to-one to the two driving mechanisms.

[0010] Preferably, the vertical rods are hinged to the horizontal rods and the corresponding driving mechanisms respectively.

[0011] Preferably, the abutment portion includes a slider, a telescopic rod and a connecting rod, the slider is slidably arranged on the cross bar along the first direction, one end of the telescopic rod is fixedly installed on the slider, the telescopic rod is vertically arranged, and the telescopic rod is telescoped along the vertical direction, the connecting rod is fixedly installed on the end of the telescopic rod away from the slider, and the axis of the connecting rod is coaxial with the first axis, and the roller is sleeved on the connecting rod.

[0012] Preferably, the cross bar is provided with teeth extending along the length direction of the cross bar, a gear is provided in the slider, the gear meshes with the teeth on the cross bar, and a one-way mechanism is provided in the slider for controlling the slider to move in one direction when it moves from one end of the cross bar to the other end.

[0013] Preferably, the second power assembly includes a mounting frame, a guide rod, and a driving wheel. The mounting frame is slidably arranged on the top rod along the length direction of the top rod. A through groove is provided on the circumference of the top rod and penetrates the top rod along the axial direction of the roller. The guide rod is slidably arranged in the through groove along the length direction of the top rod. The guide rod can rotate around its own axis in the through groove. A second spring is provided in the through groove. The second spring is closer to the first axis than the guide rod. One end of the second spring is connected to the top rod, and the other end of the second spring is fixedly connected to the guide rod. There are two driving wheels, and the two driving wheels are rotatably arranged on the mounting frame. The extension direction of the rotation axis of the two driving wheels is consistent with the extension direction of the first axis. The two driving wheels are located on both sides of the top rod in the sliding direction of the driving mechanism, and the two driving wheels can contact the bridge.

[0014] Preferably, the measuring mechanism also includes a swivel, a positioning block and a third spring. The swivel is rotatably arranged on the end face of the roller, the swivel is coaxial with the roller, and the push rod passes through the swivel and is slidably connected to the swivel; the positioning block is fixedly mounted on the push rod, and the positioning block is located on the outside of the swivel, and a contact switch is provided on the outer peripheral surface of the swivel, and the positioning block can contact the contact switch. The third spring is sleeved on the push rod, and the end of the third spring close to the first axis is fixedly connected to the push rod, and the end of the third spring away from the first axis is in contact with the swivel.

[0015] Preferably, two measuring mechanisms are provided, and the two measuring mechanisms are respectively located at the two ends of the connecting rod. The scanning mechanism includes a mounting rod and a plurality of camera assemblies. The two ends of the mounting rod are respectively connected to the two top rods in the two measuring mechanisms, and the mounting rod is parallel to the first axis. The plurality of camera assemblies are evenly arranged on the mounting rod along the extension direction of the first axis for detecting the lower surface of the bridge.

[0016] Preferably, the end of the push rod away from the first axis is provided with a chamfer, the axis extension direction of the chamfer is consistent with the extension direction of the first axis, and a straight surface is opened on the chamfer, and the perpendicular line of the chamfer on the straight surface intersects with the first axis.

[0017] The beneficial effects of the present invention are as follows: through the coordinated arrangement of the roller and the bridge, when the first power component drives the roller to rotate, the roller can move on the bridge in a direction perpendicular to the length direction of the bridge, thereby driving the push rod and the scanning mechanism to move, and the scanning mechanism can detect the bridge on the path; through the coordinated arrangement of the push rod and the roller, and through the coordinated arrangement of the scanning mechanism and the push rod, when the scanning mechanism moves with the push rod, the distance between the scanning mechanism and the detected bridge remains basically unchanged, and the data measured by the scanning mechanism is relatively accurate; the roller is set, and when the roller contacts the reinforcement of the bridge, there will be two contact points between the roller and the bridge, the roller will change the direction of movement on the bridge, the measuring mechanism will switch from the first state to the second state, the roller will no longer move, the push rod will continue to move under the action of the second power component, and the scanning mechanism will scan the junction of the bridge and the reinforcement and the reinforcement, thereby increasing the working range of the scanning mechanism and improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a bridge crack detection device provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the partial structure of an abutment portion of a bridge crack detection device provided by an embodiment of the present invention;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 A schematic structural diagram of a swivel of a bridge crack detection device provided by an embodiment of the present invention;

[0022] Figure 5 A schematic structural diagram of a scanning mechanism of a bridge crack detection device provided by an embodiment of the present invention;

[0023] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0024] Figure 7 The upper schematic diagram of a bridge crack detection device provided by an embodiment of the present invention installed on a bridge;

[0025] Figure 8 for Figure 7 Enlarged view of point C in the middle.

[0026] Among them: 100, roller; 101, push rod; 102, swivel; 103, positioning block; 104, third spring; 110, mounting frame; 111, guide rod; 112, driving wheel; 113, through slot; 114, contact switch; 115, first motor; 116, gear plate; 117, inner gear ring; 118, driving mechanism; 119, second spring; 120, mounting rod; 121, camera assembly; 201, vertical rod; 202, horizontal rod; 203, slider; 204, telescopic rod; 205, connecting rod; 206, chamfered corner; 207, straight surface; 301, bridge; 302, reinforcing rib. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention include direct and indirect connections (couplings) unless otherwise specified. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0029] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0030] like Figures 1 to 8As shown, an embodiment of the present invention provides a bridge crack detection device for detecting a flat bridge 301 and the surface of a bridge 301 provided with reinforcing ribs 302. The device includes a driving mechanism 118, a measuring mechanism, a scanning mechanism, and a supporting mechanism. The driving mechanism 118 is slidably disposed on the bridge 301 along the length direction of the bridge 301. The measuring mechanism includes a roller 100, a mandrel 101, a first power assembly, and a second power assembly. The roller 100 is rotatable about a first axis and is disposed below the bridge 301. The roller 100 is always in rolling contact with the lower surface of the bridge 301. The extension direction of the first axis is consistent with the length direction of the bridge 301. The top rod 101 is rotatably arranged around the first axis, and the top rod 101 is rotatably connected to the roller 100, and the top rod 101 can slide in the radial direction of the roller 100. The length of the top rod 101 extends along its sliding direction, and the end of the top rod 101 away from the first axis is always slidably connected to the lower surface of the bridge 301. The first power component is used to drive the roller 100 to rotate around the first axis; the second power component is used to drive the top rod 101 to slide on the lower surface of the bridge 301; the scanning mechanism is provided on the top rod 101, and the scanning mechanism is used to detect the bridge 301 over which the top rod 101 slides; the support mechanism is used to make the measuring mechanism move with the driving mechanism 118.

[0031] The measuring mechanism has a first state and a second state. In the first state, the line connecting the contact position between the roller 100 and the bridge 301 and the contact position between the top rod 101 and the bridge 301 extends along the length direction of the bridge 301, the first power assembly and the second power assembly work simultaneously, and the distance moved by the top rod 101 on the bridge 301 is consistent with the distance moved by the roller 100 on the bridge 301; in the second state, there is one and only one contact position between the roller 100 and the bridge 301, and an angle is set between the extension direction of the line connecting the contact position between the roller 100 and the bridge 301 and the contact position between the top rod 101 and the bridge 301 and the length direction of the bridge 301, and the first power assembly stops working.

[0032] By the coordinated arrangement of the roller 100 and the bridge 301, when the first power assembly drives the roller 100 to rotate, the roller 100 can move on the bridge 301 in a direction perpendicular to the length direction of the bridge 301, thereby driving the top rod 101 and the scanning mechanism to move, and the scanning mechanism can detect the bridge 301 on the path; by the coordinated arrangement of the top rod 101 and the roller 100, by the coordinated arrangement of the scanning mechanism and the top rod 101, when the scanning mechanism moves with the top rod 101, the distance between the scanning mechanism and the detected bridge 301 remains basically unchanged, and the scanning mechanism The data measured by the structure is relatively accurate; a roller 100 is set. When the roller 100 contacts the reinforcement 302 of the bridge 301, there will be two contact points between the roller 100 and the bridge 301, and the roller 100 will change the moving direction on the bridge 301. The measuring mechanism will switch from the first state to the second state, and the roller 100 will no longer move. The top rod 101 continues to move under the action of the second power component, and the scanning mechanism scans the junction between the bridge 301 and the reinforcement 302 and the reinforcement 302, thereby increasing the working range of the scanning mechanism and improving the detection accuracy.

[0033] In this embodiment, the support mechanism includes a vertical rod 201, a horizontal rod 202 and an abutment portion. One end of the vertical rod 201 is connected to the driving mechanism 118, and the horizontal rod 202 is arranged at the end of the vertical rod 201 away from the driving mechanism 118, and the horizontal rod 202 is horizontally arranged below the bridge 301. The horizontal rod 202 extends along a first direction, which is the width direction of the bridge 301. The driving mechanism 118 drives the horizontal rod 202 to move along the length direction of the bridge 301 through the vertical rod 201 to perform a comprehensive inspection of the bridge 301; the abutment portion is slidably arranged on the horizontal rod 202 along the first direction, which is used to make the roller 100 abut against the bridge 301, and at the same time provide the roller 100 with resistance to its reverse movement when it moves forward on the bridge 301. After the roller 100 contacts the reinforcement rib 302 of the bridge 301, the roller 100 can continue to rotate and move on the surface of the reinforcement rib 302 until it passes over the reinforcement rib 302, completing the inspection of the width direction of the bridge 301.

[0034] In this embodiment, there are two driving mechanisms 118, which are located on both sides of the bridge 301 in the width direction. There are two vertical rods 201, which are respectively connected to the two ends of the cross rod 202, and the two vertical rods 201 correspond one-to-one to the two driving mechanisms 118. Both ends of the cross rod 202 are provided with a driving mechanism 118, and the cross rod 202 is more stable, while improving the stability of the scanning mechanism detection.

[0035] In this embodiment, the vertical rod 201 is respectively hinged to the horizontal rod 202 and the corresponding driving mechanism 118, the driving mechanism 118 and the corresponding vertical rod 201 are rotatably connected, and the driving mechanism 118 and the vertical rod 201 are detachable, the two ends of the horizontal rod 202 are respectively rotatably connected to the corresponding vertical rod 201, and the extension direction of the rotation axis of the vertical rod 201 on the horizontal rod 202 is consistent with the extension direction of the first axis, which facilitates the disassembly and installation of the bridge crack detection device.

[0036] In another embodiment, the extension direction of the rotation axis of one vertical rod 201 on the horizontal rod 202 is the vertical direction, and the extension direction of the rotation axis of the other vertical rod 201 on the horizontal rod 202 is consistent with the extension direction of the first axis, providing different installation methods for the bridge crack detection device.

[0037] In this embodiment, the abutment portion includes a slider 203, a telescopic rod 204 and a connecting rod 205. The slider 203 is slidably arranged on the cross bar 202 along the first direction. One end of the telescopic rod 204 is fixedly installed on the slider 203. The telescopic rod 204 is vertically arranged, and the telescopic rod 204 is telescopic along the vertical direction. The telescopic rod 204 is divided into a fixed part and a movable part. The fixed part is fixedly installed on the slider 203, and the movable part is slidably arranged on the fixed part. A first spring is provided between the fixed part and the movable part. The first spring is always in a compressed state, providing a force for the roller 100 to approach the bridge 301; the connecting rod 205 is fixedly installed on the end of the telescopic rod 204 away from the slider 203, and the axis of the connecting rod 205 is coaxial with the first axis, and the roller 100 is sleeved on the connecting rod 205.

[0038] In this embodiment, the crossbar 202 is provided with teeth, which extend along the length of the crossbar 202. A gear is provided in the slider 203, which meshes with the teeth on the crossbar 202. A one-way mechanism is provided in the slider 203 for controlling the slider 203 to move in one direction when it moves from one end of the crossbar 202 to the other end. The one-way mechanism includes a cam, a rotating rod, two paddles and two fourth springs. The cam is rotatably provided in the slider 203, and the rotating rod is rotatably provided on the slider 203. Both ends of the rotating rod pass through the slider 203 and can respectively abut against the two vertical rods 201. The rotating rod is fixedly connected to the cam, one end of the two shift plates is rotatably set on the slider 203, and the two shift rods are located on both sides of the plane where the axis of the cam and the axis of the gear are located. Each fourth spring is connected to one end of one of the shift plates away from its own rotation axis. The fourth spring can push the corresponding shift plate to rotate and engage with the gear. The rotation of the cam can respectively abut against one of the shift rods and push the shift rod to disengage from the gear, thereby realizing the unidirectional rotation of the gear; when the cam abuts against one of the shift plates, the elastic force of the fourth spring corresponding to the shift plate will not push the cam to rotate in the opposite direction.

[0039] In another embodiment, the one-way mechanism includes a third motor and two control switches. The output shaft of the third motor is fixedly connected to the gear. The rotation of the third motor drives the gear to rotate. The two control switches are arranged on the two surfaces of the slider 203 that are close to the two vertical rods 201 respectively. When the vertical rod 201 contacts a corresponding surface of the slider 203, the corresponding control switch is triggered, the third motor starts to reverse, and the slider 203 moves in the opposite direction on the horizontal rod 202.

[0040] In this embodiment, the second power assembly includes a mounting frame 110, a guide rod 111, a driving wheel 112 and a second motor. The mounting frame 110 is slidably arranged on the top rod 101 along the length direction of the top rod 101. A through groove 113 is provided on the circumference of the top rod 101, which penetrates the top rod 101 along the axial direction of the roller 100. The guide rod 111 is slidably arranged in the through groove 113 along the length direction of the top rod 101. The guide rod 111 can rotate around its own axis in the through groove 113. A second spring 119 is provided in the through groove 113. The second spring 119 is closer to the first axis than the guide rod 111. One end of the second spring 119 is connected to the top rod 101, and the other end of the second spring 119 is fixedly connected to the guide rod 111. There are two driving wheels 112, which are rotatably arranged on the mounting frame 110, and the extension direction of the rotation axis of the two driving wheels 112 is consistent with the extension direction of the first axis. 112 is located on both sides of the top rod 101 in the sliding direction of the driving mechanism 118. The two driving wheels 112 can contact the bridge 301. There are two second motors, and the two second motors are respectively connected to the two driving wheels 112. The second motor is used to drive the corresponding driving wheels 112 to rotate. The second spring 119 is always in a compressed state, and the two driving wheels 112 will first contact the bridge 301 relative to the top rod 101. When the top rod 101 contacts the bridge 301, there is friction between the two driving wheels 112 and the bridge 301. The rotation of the driving wheel 112 can drive the top rod 101 to slide on the bridge 301 through the friction between the bridge 301; when the contact surface between the top rod 101 and the bridge 301 is not perpendicular to the top rod 101, the mounting frame 110 rotates relative to the top rod 101 through the guide rod 111. At this time, the second spring 119 is twisted by the guide rod 111, providing a reset force for the mounting frame 110.

[0041] In this embodiment, the measuring mechanism further includes a rotating ring 102, a positioning block 103 and a third spring 104. The rotating ring 102 is rotatably arranged on the end surface of the roller 100. The rotating ring 102 is coaxial with the roller 100. The push rod 101 passes through the rotating ring 102 and is slidably connected to the rotating ring 102. The positioning block 103 is fixedly mounted on the push rod 101 and is located on the outside of the rotating ring 102. A contact switch 114 is provided on the outer peripheral surface of the rotating ring 102. The positioning block 103 can be in contact with the contact switch 114. The third spring 104 is sleeved on the push rod 101, and the end of the third spring 104 close to the first axis is fixedly connected to the push rod 101, and the end of the third spring 104 away from the first axis is in contact with the rotating ring 102; the first power assembly includes a first motor 115 and a gear plate 116, the first motor 115 is fixedly mounted on the telescopic rod 204, the gear plate 116 is fixedly mounted on the output shaft of the first motor 115, and the roller 100 is provided with an inner gear ring 117, which is aligned with the roller 100. The gear disc 116 is meshed with the inner gear ring 117; when the measuring mechanism is in the first state, the positioning block 103 contacts the contact switch 114, and the first motor 115 drives the roller 100 to rotate through the cooperation of the gear disc 116 and the inner gear ring 117, and the second motor drives the driving wheel 112 to rotate, and the driving wheel 112 drives the top rod 101 to move together with the roller 100; if the roller 100 encounters the intersection position of the bridge 301 and the reinforcement rib 302 during the movement and cannot contact the intersection position, due to The second motor drives the drive wheel 112 to continue rotating, and the push rod 101 slides on the roller 100 in the radial direction of the roller 100. The positioning block 103 disengages from the contact switch 114, and the first motor 115 stops. The roller 100 is stationary relative to the bridge 301. The push rod 101 can slide relative to the roller 100 while also driving the rotating ring 102 to rotate relative to the roller 100, thereby contacting the intersection of the bridge 301 and its reinforcement rib 302, making the scanning mechanism more comprehensive. Each time the rotating rod contacts the corresponding vertical rod 201, the second motor and the first motor 115 stop rotating, requiring a restart operation.

[0042] In another embodiment, the contact switch 114 is electrically connected to the two control switches respectively, that is, when the positioning block 103 is disengaged from the contact switch 114, the first motor 115 and the third motor stop rotating at the same time.

[0043] In this embodiment, two measuring mechanisms are provided, and the two measuring mechanisms are respectively located at the two ends of the connecting rod 205. The scanning mechanism includes a mounting rod 120 and a plurality of camera components 121. The two ends of the mounting rod 120 are respectively connected to the two top rods 101 in the two measuring mechanisms, and the mounting rod 120 is parallel to the first axis. The plurality of camera components 121 are evenly arranged on the mounting rod 120 along the extension direction of the first axis for detecting the lower surface of the bridge 301. The plurality of camera components 121 can simultaneously detect the bridge 301 between the two rollers 100, thereby improving the detection efficiency.

[0044] In this embodiment, a chamfer 206 is provided at one end of the push rod 101 away from the first axis, and the axis extension direction of the chamfer 206 is consistent with the extension direction of the first axis, and a straight surface 207 is provided on the chamfer 206, and the perpendicular line of the chamfer 206 on the straight surface 207 intersects with the first axis. The chamfer 206 is provided, and when encountering a bridge 301 with a reinforcing rib 302, the distance between the end face of the push rod 101 and the junction of the bridge 301 and the reinforcing rib 302 can be reduced, so as to ensure the consistency of the distance between the camera assembly 121 and the detection surface, thereby improving the accuracy of the detection result; the straight surface 207 is provided on the chamfer 206, while reducing the error, so that when the push rod 101 passes through the edge of the reinforcing rib 302, the contact pressure between the push rod 101 and the reinforcing rib 302 is increased, thereby avoiding the push rod 101 from sliding on the reinforcing rib 302 relative to the roller 100, thereby further improving the accuracy of the detection result.

[0045] The working principle of the bridge crack detection device provided in the above embodiment is as follows:

[0046] First, the slider 203 is mounted on the crossbar 202 and positioned near the end of the crossbar 202. Then, a driving mechanism 118 is connected to a vertical rod 201. A rope is tied to the other vertical rod 201. Then, the crossbar 202 is placed under the bridge 301 and the driving mechanism 118 connected to the vertical rod 201 is placed at the edge of the bridge 301 so that the driving mechanism 118 can move along the length of the bridge 301. At this time, the slider 203 is 3 will not slide on the horizontal bar 202. Then, the other end of the rope connected to the vertical bar 201 is tied to the drone, and the drone is controlled to fly under the bridge 301 with the rope, so that the rope can be passed from the other side of the bridge 301. The rope is pulled up to pull the vertical bar 201 up and connect it to another driving mechanism 118. The driving mechanism 118 is also placed on the edge of the bridge 301. At this time, the horizontal bar 202 is located directly below the bridge 301 and parallel to the bridge 301 under the action of the two vertical bars 201.

[0047] At this time, the roller 100 contacts the lower surface of the bridge 301, the telescopic rod 204 is compressed, the top rod 101 also contacts the bridge 301, the positioning block 103 contacts the contact switch 114, and the third spring 104 is stretched, providing the top rod 101 with force to continue to approach the bridge 301; the first motor 115 and the second motor are controlled to start, the first motor 115 drives the gear plate 116 to rotate, and the gear plate 116 drives the roller 100 to rotate by engaging with the gear ring, and the roller 100 rolls on the bridge 301 and moves in the first direction. The second motor drives the corresponding driving wheel 112 to rotate, and the driving wheel 112 rotates to drive the top rod 101 to slide on the bridge 301 along the first direction with the direction of the roller 100. The speed of the roller 100 is consistent with the speed of the top rod 101. As the roller 100 and the top rod 101 move, the camera component 121 detects the bridge 301 on the moving path.

[0048] When the roller 100 contacts the reinforcement rib 302 of the bridge 301 during the forward movement, the roller 100 continues to rotate and moves on the bridge 301 in a direction away from the lower surface of the bridge 301. At this time, the roller 100 is separated from the lower surface of the bridge 301, and the top rod 101 is still in contact with the lower surface of the bridge 301 under the action of the third spring 104. The top rod 101 and the rotating ring 102 slide relative to each other, the positioning block 103 is separated from the contact switch 114, the first motor 115 stops rotating, the roller 100 no longer moves, the driving wheel 112 continues to drive the top rod 101 to slide on the bridge 301, and the third spring 104 pulls the top rod 101 to slide on the bridge 301. The rod 101 moves along the radial direction of the roller 100 away from the connecting rod 205, and at the same time, the top rod 101 drives the swivel 102 to rotate relative to the roller 100; when the two driving wheels 112 pass the intersection of the bridge 301 and the reinforcing rib 302, the driving wheel 112 will contact the reinforcing rib 302 under the action of the second spring 119, and the driving wheel 112 drives the top rod 101 to slide on the reinforcing rib 302. At this time, the top rod 101 gradually approaches the contact position between the roller 100 and the reinforcing rib 302, and the top rod 101 slides in the opposite direction relative to the swivel 102, the third spring 104 is stretched, and the positioning block 103 approaches the contact switch 114.

[0049] After the positioning block 103 contacts the contact switch 114, the extension direction of the line connecting the contact position of the push rod 101 and the reinforcing rib 302 and the contact position of the roller 100 and the reinforcing rib 302 is consistent with the extension direction of the first axis. The first motor 115 is started, and the roller 100 moves together with the push rod 101 again.

[0050] When the push rod 101 moves on the reinforcing rib 302 to the edge of the reinforcing rib 302, the roller 100 also contacts the edge of the reinforcing rib 302. If the edge of the reinforcing rib 302 is steep, the roller 100 and the push rod 101 will rotate around the edge of the reinforcing rib 302, and the straight surface 207 on the push rod 101 will abut against the edge of the reinforcing rib 302. The push rod 101 will not slide relative to the edge when rotating around the edge of the reinforcing rib 302 until the roller 100 rolls forward on the reinforcing rib 302 again.

[0051] When the roller 100 moves from one side of the bridge 301 to the other, the rotating rod on the slider 203 will abut against the corresponding vertical rod 201, and the rotation of the rotating rod will drive the cam to rotate. The rotation of the cam will push the paddle originally engaged with the gear to rotate and move away from the gear, and the other paddle will be engaged with the gear under the action of the corresponding fourth spring, and the direction of rotation of the gear will change. At the same time, the second motor and the first motor 115 stop rotating; then the two driving mechanisms 118 are started, and the two driving mechanisms 118 drive the cross bar 202 to move a certain distance along the length direction of the bridge 301 through the vertical rod 201, and then the first motor 115 and the second motor are started in reverse, and the roller 100 and the driving wheel 112 continue to move on the bridge 301.

[0052] When encountering a bridge pier, the bridge 301 crack detection device only needs to be disassembled, and then assembled after crossing the pier to continue the detection. The entire process does not require the operator to stand under the bridge 301 to observe, which ensures the personal safety of the operator and improves the accuracy of the detection data.

[0053] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A bridge crack detection device for detecting the surface of a flat bridge or a bridge with reinforcement ribs, characterized in that: include: A driving mechanism, a measuring mechanism, a scanning mechanism and a supporting mechanism. The driving mechanism is slidingly arranged on the bridge along the length direction of the bridge. The measuring mechanism includes a roller, a push rod, a first power assembly and a second power assembly. The roller is arranged below the bridge and rotates around a first axis, and the roller is always in rolling contact with the lower surface of the bridge. The extension direction of the first axis is consistent with the length direction of the bridge. The push rod is rotatably arranged around the first axis, the push rod is rotationally connected to the roller, and the push rod can slide along the radial direction of the roller. The length of the push rod extends along its sliding direction. The end of the push rod away from the first axis is always slidingly connected to the lower surface of the bridge. The first power assembly is used to drive the roller to rotate around the first axis. The second power assembly is used to drive the push rod to slide on the lower surface of the bridge. The scanning mechanism is arranged on the push rod, and the scanning mechanism is used to detect the bridge over which the push rod slides. The supporting mechanism is used to enable the measuring mechanism to move with the driving mechanism. The measuring mechanism has a first state and a second state. In the first state, a line connecting the contact position between the roller and the bridge and the contact position between the push rod and the bridge extends along the length of the bridge. The first power assembly and the second power assembly operate simultaneously, and the distance moved by the push rod on the bridge is consistent with the distance moved by the roller on the bridge. In the second state, there is one and only one contact point between the roller and the bridge, and an angle is formed between the extending direction of the line connecting the contact point between the roller and the bridge and the contact point between the top rod and the bridge and the length direction of the bridge, and the first power assembly stops working; The support mechanism includes a vertical rod, a horizontal rod, and an abutment portion. One end of the vertical rod is connected to the driving mechanism. The horizontal rod is provided at the end of the vertical rod away from the driving mechanism and is horizontally provided below the bridge. The horizontal rod extends in a first direction, which is the width direction of the bridge. The abutment portion is slidably provided on the horizontal rod in the first direction, and is used to make the roller abut against the bridge, while providing resistance to the roller moving in the opposite direction when it moves forward on the bridge. There are two driving mechanisms, which are located on both sides of the bridge width direction. There are two vertical rods, which are respectively connected to the two ends of the crossbar, and the two vertical rods correspond to the two driving mechanisms one by one. There are two measuring mechanisms, which are respectively located at the two ends of the connecting rod. The scanning mechanism includes a mounting rod and multiple camera assemblies. The two ends of the mounting rod are respectively connected to the two top rods in the two measuring mechanisms, and the mounting rod is parallel to the first axis. Multiple camera assemblies are evenly arranged on the mounting rod along the extension direction of the first axis for detecting the lower surface of the bridge.

2. A bridge crack detection device according to claim 1, characterized in that: The vertical rods are respectively hinged to the horizontal rods and the corresponding driving mechanisms.

3. The bridge crack detection device according to claim 1, characterized in that: The abutment portion includes a slider, a telescopic rod and a connecting rod. The slider is slidably arranged on the cross bar along a first direction. One end of the telescopic rod is fixedly installed on the slider. The telescopic rod is vertically arranged and telescopically extends and retracts along the vertical direction. The connecting rod is fixedly installed on the end of the telescopic rod away from the slider, and the axis of the connecting rod is coaxial with the first axis. The roller is sleeved on the connecting rod.

4. A bridge crack detection device according to claim 3, characterized in that: The crossbar is provided with teeth extending along the length of the crossbar. A gear is provided in the slider, which meshes with the teeth on the crossbar. The slider is provided with a one-way mechanism for controlling the slider to move in one direction when it moves from one end of the crossbar to the other end.

5. The bridge crack detection device according to claim 1, characterized in that: The second power assembly includes a mounting frame, a guide rod, and a driving wheel. The mounting frame is slidably arranged on the top rod along the length direction of the top rod. A through groove is provided on the circumference of the top rod and penetrates the top rod along the axial direction of the roller. The guide rod is slidably arranged in the through groove along the length direction of the top rod. The guide rod can rotate around its own axis in the through groove. A second spring is provided in the through groove. The second spring is closer to the first axis than the guide rod. One end of the second spring is connected to the top rod, and the other end of the second spring is fixedly connected to the guide rod. There are two driving wheels, and the two driving wheels are rotatably arranged on the mounting frame. The extension direction of the rotation axis of the two driving wheels is consistent with the extension direction of the first axis. The two driving wheels are located on both sides of the top rod in the sliding direction of the driving mechanism, and the two driving wheels can contact the bridge.

6. The bridge crack detection device according to claim 1, characterized in that: The measuring mechanism also includes a swivel, a positioning block and a third spring. The swivel is rotatably arranged on the end face of the roller, the swivel is coaxial with the roller, and the push rod passes through the swivel and is slidably connected to the swivel; the positioning block is fixedly installed on the push rod, and the positioning block is located on the outside of the swivel, and a contact switch is provided on the outer peripheral surface of the swivel, and the positioning block can contact the contact switch. The third spring is sleeved on the push rod, and the end of the third spring close to the first axis is fixedly connected to the push rod, and the end of the third spring away from the first axis is in contact with the swivel.

7. The bridge crack detection device according to claim 1, characterized in that: A chamfer is provided at one end of the push rod away from the first axis, the axis extension direction of the chamfer is consistent with the extension direction of the first axis, and a straight surface is opened on the chamfer, and the vertical line of the chamfer on the straight surface intersects with the first axis.

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