Bridge expansion joint detection device

Abstract

The invention discloses a bridge expansion joint detection device, and belongs to the technical field of bridge detection. The device comprises a mobile carrier, a driving mechanism, a cleaning mechanism, a multi-dimensional detection mechanism, a data processing module, a wireless communication module and a power supply module. The moving carrier bears all the assemblies and moves along the expansion joint, and the driving mechanism provides power for device movement and cleaning mechanism operation. The cleaning mechanism is used for cleaning sundries in the expansion joint; the multi-dimensional detection mechanism integrates a laser displacement sensor, a high-definition industrial camera and an ultrasonic detection sensor, and synchronous detection of the width, the surface state and the internal defects of the expansion joint is achieved. The data processing module analyzes detection data in real time, data and position association is achieved in combination with GPS / Beidou positioning, the data and the position are transmitted to a remote platform through the wireless communication module, and the alarm module starts sound-light alarm when the disease exceeds the standard. According to the invention, multi-dimensional accurate detection of the expansion joint is realized, the detection efficiency and reliability are improved, and powerful support is provided for bridge maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge detection, in particular to a bridge expansion joint detection device. BACKGROUND

[0002] The bridge expansion joint is a key component of the bridge structure, which is used to adapt to the expansion and deformation of the beam body caused by temperature, load, concrete shrinkage and other factors. Its working state directly affects the driving comfort, bridge structure safety and service life. Common expansion joint diseases include: abnormal joint width (too wide or stuck), damaged water stop, type steel cracking, concrete anchoring area damage, accumulation of debris in the joint and internal steel corrosion, etc.

[0003] At present, the detection of bridge expansion joints mainly relies on manual visual inspection combined with simple tools (such as calipers, rulers, and crack observation instruments). This method has the following obvious defects: 1. Low efficiency and high labor intensity: manual detection along the expansion joint is slow, and it needs to close the traffic or occupy the lane, which has safety hazards; 2. Single detection dimension and strong subjectivity: usually only surface appearance inspection can be performed, it is difficult to quantify the joint width change trend, and it is impossible to detect hidden defects (such as cavities, voids, and internal cracks) inside the concrete or steel components in the joint; 3. Dispersed data, difficult to manage: detection data is mostly recorded manually, lacks accurate location information association, and it is difficult to form a systematic historical database for comparative analysis and trend prediction; 4. Cleaning degree affects accuracy: the expansion joint often accumulates sand, gravel and other debris, which seriously affects the accurate observation and measurement of the joint width and surface state.

[0004] In recent years, some detection devices based on vision or single sensor have appeared, but their functions are often single, or still need manual assistance for cleaning and positioning, and have not realized the full-process automation integration of pre-detection cleaning, multi-dimensional data synchronous acquisition, real-time processing and positioning uploading. There is still a lot of room for improvement in the comprehensiveness, intelligence and efficiency of detection. SUMMARY

[0005] The present application mainly aims at the above-mentioned problems existing in the prior art, and provides a bridge expansion joint detection device.

[0006] The purpose of the present application is mainly realized by the following scheme: A bridge expansion joint detection device, characterized in that it comprises a mobile carrier, a driving mechanism, a cleaning mechanism, a multi-dimensional detection mechanism, a data processing module, a wireless communication module and a power supply module. The mobile carrier is used to carry the components of the device and realize movement along the bridge expansion joint, and the bottom is provided with a set of rollers to facilitate smooth travel on the bridge deck. The driving mechanism is mounted on the moving carrier and can provide power for movement of the roller set and operation of the cleaning mechanism. The multi-dimensional detection mechanism includes a gap width detection unit, a surface state detection unit, and an internal defect detection unit. The gap width detection unit uses a laser displacement sensor to accurately measure the width value of the expansion joint. The surface state detection unit includes a high-definition industrial camera and an LED light supplement module to collect apparent images of the expansion joint and the concrete area on both sides. The internal defect detection unit uses an ultrasonic detection sensor to detect the compactness and cavities of the internal concrete of the expansion joint. The moving carrier is installed with a vertically arranged expansion component, and the multi-dimensional detection mechanism is integrated at the expansion end of the expansion component. The position of the detection sensor can be adjusted according to the structure height of different bridge expansion joints to ensure the optimal detection distance and angle. The data processing module is electrically connected with the multi-dimensional detection mechanism and the wireless communication module for receiving and processing various detection data in real time. The built-in image recognition algorithm and defect judgment model can automatically analyze and identify the collected images and analyze and judge the ultrasonic data. The wireless communication module is used to transmit the processed detection data, images, and position information to the remote monitoring platform in real time or at regular intervals and can receive the control instructions from the platform. The power supply module provides stable working power for all components of the device.

[0007] As a preferred embodiment, the moving carrier includes a plate body, the roller set includes two first rollers on the front side and a second roller in the middle of the back side, forming a stable three-point support structure. The first rollers are rotatably connected to the bottom front side of the plate body through first rotating shafts, and the second roller is rotatably connected to the middle of the back side of the plate body through a second rotating shaft. A handle is also installed on the back side of the upper surface of the plate body for manual pushing or carrying.

[0008] As preferred, the driving mechanism comprises an engine, a third rotating shaft, a fourth rotating shaft and a fifth rotating shaft. The output end of the engine is fixedly connected with the third rotating shaft. The side wall of the third rotating shaft and the fourth rotating shaft is respectively fixedly sleeved with a driving gear and a driven gear which are engaged with each other, and the outer side of the driving gear and the driven gear is covered with a protective cover, and the third rotating shaft and the fourth rotating shaft are both rotationally connected with the protective cover. One end of the third rotating shaft is fixedly sleeved with a first driving pulley, and one end of the fourth rotating shaft is fixedly sleeved with a second driving pulley. The side wall of the first rotating shaft is fixedly sleeved with a first driven pulley, and the fifth rotating shaft is rotationally connected with the moving carrier, and one end of the fifth rotating shaft is fixedly sleeved with a second driven pulley. The first driving pulley and the first driven pulley are connected through a first transmission belt, and the second driving pulley and the second driven pulley are connected through a second transmission belt. Through the gear and belt transmission system, the single engine simultaneously drives the walking roller and the cleaning mechanism.

[0009] As preferred, the cleaning mechanism comprises a cleaning disc and a flexible cleaning plate installed on the circumference of the cleaning disc. The middle part of the cleaning disc is coaxially fixedly sleeved on one end of the fifth rotating shaft, and the cleaning disc protrudes from the side of the moving carrier, so that it can extend into the expansion joint directly above. The flexible cleaning plate is uniformly circumferentially provided along the axis of the cleaning disc, and the bottom of the cleaning disc is lower than the walking surface of the roller set, so that the flexible cleaning plate can effectively sweep the loose debris in the joint and on the surface. It also comprises a dust suction assembly located on the rear side of the cleaning disc, comprising a dust collector fixedly installed on one side of the moving carrier, and the dust suction pipe of the dust collector can extend into the expansion joint for absorbing the fine dust swept up to prevent secondary pollution of the detection area. The cleaning disc, the dust suction assembly, the expansion assembly and the multi-dimensional detection mechanism integrated thereon are located on the same straight line, forming a continuous working flow of first sweeping, then dust suction and finally detection.

[0010] As preferred, the moving carrier is also provided with a positioning module, which adopts GPS / Beidou dual-mode positioning and is electrically connected with the data processing module, for real-time acquisition of geographic position information of the detection device, and accurate association and binding of the position information with the currently collected detection data and images.

[0011] As preferred, the gap width detection unit comprises at least two laser displacement sensors which are symmetrically arranged along the width direction of the expansion joint, and the average gap width can be more accurately calculated and the height difference of the two sides can be judged by measuring the distance change of the edges of the two sides of the gap.

[0012] As preferred, the data processing module is connected with a data storage unit, and the data storage unit is an SD card with a capacity not less than 100GB, supporting local redundant storage of detection data, facilitating data backup when the network is not good and post-export analysis.

[0013] As preferred, the device further comprises an alarm module, which is electrically connected with the data processing module. When the defect judgment model in the data processing module identifies that the disease level reaches the preset threshold, the alarm module will immediately remind the on-site staff through the sound and light alarm mode.

[0014] As preferred, the power supply module comprises a plurality of groups of rechargeable lithium battery groups and a charging interface, and the charging interface supports fast charging function to meet the endurance requirement of long-time field operation.

[0015] Compared with the prior art, the present application has the following beneficial technical effects: (1) The present application realizes multi-dimensional accurate detection and covers the full state of expansion joints. Through the cooperative work of the gap width detection unit, the surface state detection unit and the internal defect detection unit, the width data, surface damage information and internal defect situation of the expansion joint are obtained at one time, solving the problem of single detection dimension of the existing equipment. The symmetrical arrangement of the laser displacement sensor and the application of ultrasonic detection technology, combined with the algorithm optimization of the data processing module, significantly improve the accuracy and reliability of the detection data; (2) The present application improves the detection stability by automatic cleaning. A cleaning mechanism combining mechanical cleaning and dust collection is provided to completely remove stones, leaves and other sundries in the expansion joint before detection, avoiding interference of sundries on the detection sensor and image acquisition, and improving the accuracy of detection data from the source. The cleaning mechanism and the roller set share a set of driving mechanism, which simplifies the structure of the device and reduces the energy consumption; (3) The data processing module in the present application is built-in image recognition algorithm and defect judgment model, which can automatically analyze the detection data in real time without human intervention. Combined with GPS / Beidou dual-mode positioning, the detection data and position information are accurately associated. The wireless communication module realizes real-time interaction of data and remote monitoring platform, and the local large-capacity SD card ensures that the data is not lost, providing timely and complete data support for maintenance decision-making; (4) The present application is mobile and flexible, and the mobile carrier is designed through the cooperation of the roller set and the handle, which can realize stable movement along the expansion joint and is convenient for staff to assist in operation under complex working conditions. The setting of the expansion assembly makes the detection mechanism adaptable to expansion joints of different depths, and the multiple groups of rechargeable lithium battery groups and the fast charging function improve the endurance and outdoor adaptability of the device; (5) The setting of the alarm module in the present application can immediately remind the staff through sound and light alarm when serious diseases are detected, avoiding safety hazards caused by missed detection of diseases and improving the response speed of maintenance work. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the present application; Figure 2is a side view of the present application; Figure 3 is a structural schematic diagram of the driving mechanism in the present application; Figure 4 is a power supply schematic diagram of the power supply module in the present application.

[0017] Reference signs: 1 - telescopic assembly; 2 - plate body; 3 - first roller; 4 - second roller; 5 - first rotating shaft; 6 - second rotating shaft; 7 - handle; 8 - engine; 9 - third rotating shaft; 10 - fourth rotating shaft; 11 - fifth rotating shaft; 12 - driving gear; 13 - driven gear; 14 - protective cover; 15 - first driving pulley; 16 - second driving pulley; 17 - first driven pulley; 18 - second driven pulley; 19 - first transmission belt; 20 - second transmission belt; 21 - cleaning disc; 22 - flexible cleaning plate; 23 - dust collector; 24 - dust suction pipe; 25 - power supply module. DETAILED DESCRIPTION

[0018] The technical solutions of the present application will be further described in detail below by specific embodiments in combination with the drawings. It should be understood that the implementation of the present application is not limited to the following embodiments, and any form of variation and / or change made to the present application will fall within the protection scope of the present application.

[0019] As Figures 1-4 shown, the present application discloses a technical solution, a bridge expansion joint detection device, which comprises a mobile carrier, a driving mechanism, a cleaning mechanism, a multi-dimensional detection mechanism, a data processing module, a wireless communication module, a positioning module, an alarm module and a power supply module 25.

[0020] The mobile carrier is used to carry the components of the device and realize stable movement along the bridge expansion joint, and the bottom thereof is provided with a roller set; the mobile carrier comprises a plate body 2, and the roller set adopts a "two front and one rear" layout form, specifically two first rollers 3 on the left and right sides of the front side and a second roller 4 in the middle of the rear side, which can improve the guidance and stability of the device when moving along the expansion joint; the first roller 3 is rotationally connected to the bottom of the front side of the plate body 2 through a first rotating shaft 5, and the second roller 4 is rotationally connected to the middle of the rear side of the plate body 2 through a second rotating shaft 6; a handle 7 is also installed on the upper surface of the rear side of the plate body 2, which facilitates the auxiliary control of the device movement by the staff under special working conditions.

[0021] The driving mechanism is installed on the moving carrier to provide power for the rotation of the roller set and the operation of the cleaning mechanism. The driving mechanism comprises an engine 8, a third rotating shaft 9, a fourth rotating shaft 10 and a fifth rotating shaft 11. The output end of the engine 8 is fixedly connected with the third rotating shaft 9. The side walls of the third rotating shaft 9 and the fourth rotating shaft 10 are respectively fixedly sleeved with a driving gear 12 and a driven gear 13 which are engaged with each other. The power is branched by gear transmission. The driving gear 12 and the driven gear 13 are covered with a protective cover 14 on the outer side, which is used to prevent dust and sundries from interfering with the gear transmission and to improve the safety of the device. The third rotating shaft 9 and the fourth rotating shaft 10 are both rotatably connected to the protective cover 14 to ensure the stability of rotation. One end of the third rotating shaft 9 is fixedly sleeved with a first driving pulley 15. One end of the fourth rotating shaft 10 is fixedly sleeved with a second driving pulley 16. The side wall of the first rotating shaft 5 is fixedly sleeved with a first driven pulley 17. The fifth rotating shaft 11 is rotatably connected to the moving carrier, and one end of the fifth rotating shaft 11 is fixedly sleeved with a second driven pulley 18. The first driving pulley 15 and the first driven pulley 17 are connected by a first transmission belt 19 to realize the transmission of power to the first roller 3. The second driving pulley 16 and the second driven pulley 18 are connected by a second transmission belt 20 to realize the transmission of power to the cleaning mechanism.

[0022] The cleaning mechanism is used to remove sundries in the expansion joint before detection to avoid interference with the detection accuracy. The cleaning mechanism comprises a mechanical cleaning assembly and a dust collection assembly. The mechanical cleaning assembly comprises a cleaning disc 21 and a flexible cleaning plate 22 installed on the circumferential surface of the cleaning disc 21. The middle part of the cleaning disc 21 is coaxially fixedly sleeved on one end of the fifth rotating shaft 11, and the cleaning disc 21 protrudes from the side of the moving carrier to ensure accurate butt joint with the expansion joint. The flexible cleaning plate 22 is evenly circumferentially arranged along the axis of the cleaning disc 21 and is made of rubber material, which can effectively clean the sundries and avoid damaging the expansion joint structure. The bottom of the cleaning disc 21 is lower than the running surface of the roller set to ensure that the flexible cleaning plate 22 can clean the inside of the expansion joint. The dust collection assembly is located at the rear side of the cleaning disc 21 and is used to suck and remove the fine sundries remaining after mechanical cleaning. The dust collection assembly comprises a dust collector 23 fixedly installed on one side of the moving carrier. The suction pipe 24 of the dust collector 23 can extend into the expansion joint to realize accurate dust collection. The cleaning disc 21, the dust collection assembly and the expansion assembly 1 are located on the same straight line to ensure that the cleaned area can be immediately detected to improve the detection efficiency.

[0023] The multi-dimensional detection mechanism is used for comprehensively obtaining the width data, surface state and internal defect information of the expansion joint, and includes a gap width detection unit, a surface state detection unit and an internal defect detection unit; a vertically arranged expansion assembly 1 is installed on a mobile carrier, and the multi-dimensional detection mechanism is integrated at the expansion end of the expansion assembly 1, the height of the detection mechanism is adjusted through the expansion of the expansion assembly 1, and the detection requirements of expansion joints with different depths are adapted; the gap width detection unit adopts a laser displacement sensor, includes at least two laser displacement sensors, and is symmetrically arranged along the width direction of the expansion joint, and the width detection precision is improved through multi-sensor data fusion; the surface state detection unit includes a high-definition industrial camera and an LED light supplementing module, the high-definition industrial camera is used for collecting the surface image of the expansion joint, the LED light supplementing module is used for providing a stable light source when the light is insufficient, and the image definition is ensured; the internal defect detection unit adopts an ultrasonic detection sensor, and the detection of internal defects such as cavities and cracks of the expansion joint is realized through the emission and reception of ultrasonic waves.

[0024] The data processing module is electrically connected with the multi-dimensional detection mechanism, the positioning module, the wireless communication module, the alarm module and the data storage unit, is a core control component of the device, has a built-in image recognition algorithm and a defect judgment model, can process the surface image collected by the high-definition industrial camera, identify diseases such as surface damage and cracks, analyze the width data collected by the laser displacement sensor and the internal defect data collected by the ultrasonic detection sensor, and has a data storage unit connected therewith, the data storage unit is an SD card with a capacity not less than 100 GB, supports local data storage and export, and avoids data loss.

[0025] The positioning module adopts GPS / Beidou dual-mode positioning, is electrically connected with the data processing module, is used for real-time acquisition of detection position information, and stores the position information and corresponding detection data in association, realizes accurate positioning of the disease position, and provides a position basis for subsequent maintenance.

[0026] The wireless communication module is used for realizing bidirectional transmission of detection data and position information and a remote monitoring platform, a worker can real-time view the detection data through the remote monitoring platform, and can send a control instruction to the device to realize remote control.

[0027] The alarm module is electrically connected with the data processing module, preset disease thresholds of different levels are set, when the data processing module judges that the detected disease level reaches the preset threshold, the alarm module reminds the on-site worker to handle in time through a sound and light alarm mode.

[0028] The power supply module 25 provides a stable working power supply for each component of the device, includes a plurality of rechargeable lithium battery groups and a charging interface, the charging interface supports a fast charging function, prolongs the endurance time of the device, and meets the long-time outdoor detection requirement.

[0029] In this embodiment, the plate body 2 of the mobile carrier is made of high-strength aluminum alloy material, which not only ensures the carrying capacity but also reduces the weight of the device.

[0030] The first roller 3 and the second roller 4 are both made of rubber material.

[0031] The engine 8 of the driving mechanism is a small gasoline engine with a power of 2.5 kW.

[0032] The flexible cleaning plate 22 of the cleaning mechanism is made of nitrile rubber with a Shore hardness of 60, ensuring that it can clean deep into the expansion joint.

[0033] The dust collector 23 is an industrial-grade dust collector with a power of 1.2 kW, and the dust suction pipe 24 is a flexible metal hose with a dust suction port at the end with a width of 80 mm, suitable for different widths of expansion joints.

[0034] The expansion assembly 1 of the multi-dimensional detection mechanism selects an electric push rod with a stroke of 300 mm, with a load capacity not less than 5 kg; the gap width detection unit uses two LK-G80 laser displacement sensors with a measurement accuracy of ±0.01 mm, symmetrically arranged along the width direction of the expansion joint with a spacing of 100 mm; the high-definition industrial camera of the surface state detection unit selects an MV-CA050-10GM camera with a resolution of 50 million pixels, and the LED fill light module uses a 10W ring-shaped fill light to ensure that clear images can still be obtained on cloudy days or at night; the internal defect detection unit uses an UT3000 ultrasonic detection sensor with a detection depth of 500 mm and a resolution of 0.1 mm.

[0035] The data processing module uses a microprocessor with a model number of STM32H743, which has a built-in surface defect recognition algorithm based on deep learning and an ultrasonic defect judgment model, with a data processing speed not less than 100 Mbps; the data storage unit selects an industrial-grade SD card with a capacity of 128 GB, supporting high-speed reading and writing; the wireless communication module uses a 4G / 5G dual-mode communication module to ensure that data transmission can still be achieved in remote areas; the positioning module selects a GPS / Beidou dual-mode positioning module with a model number of UBLOXM8T, with a positioning accuracy of ±1 m; the alarm module includes a red LED warning light and a buzzer, with an alarm volume not less than 85 dB; the power supply module 25 uses two groups of 12V / 10Ah rechargeable lithium battery packs in parallel, with a total capacity of 20Ah, and the charging interface supports QC3.0 fast charging protocol, allowing continuous operation for more than 8 hours after full charging.

[0036] The working process of the present application is as follows: 1. Preparation stage: The staff pushes the device to the starting detection position of the bridge expansion joint through the handle 7, adjusts the height of the expansion assembly 1, so that each sensor of the multi-dimensional detection mechanism is accurately connected with the expansion joint; sends a start instruction to the device through the remote monitoring platform, and the power supply module 25 supplies power to each component.

[0037] 2. Cleaning stage: the engine 8 starts to drive the third rotating shaft 9 to rotate, which drives the fourth rotating shaft 10 to rotate through the meshing of the driving gear 12 and the driven gear 13; the fourth rotating shaft 10 drives the fifth rotating shaft 11 to rotate through the second driving pulley 16 and the second transmission belt 20, and then drives the cleaning disc 21 to rotate, and the flexible cleaning plate 22 mechanically cleans the stones, leaves and other sundries in the expansion joint; at the same time, the dust collector 23 starts to work, and the suction pipe 24 extends into the expansion joint to suck and remove the small sundries left after mechanical cleaning, ensuring that the detection area is free of sundries interference.

[0038] 3. Moving and detecting stage: the third rotating shaft 9 drives the first rotating shaft 5 to rotate through the first driving pulley 15 and the first transmission belt 19, so that the first roller 3 rotates, and the device moves at a constant speed along the bridge expansion joint under the guidance of the second roller 4, and the moving speed can be adjusted by the rotating speed of the engine 8, and the default moving speed is 0.5 m / s; during the moving process, the two laser displacement sensors collect the width data of the expansion joint in real time, the high-definition industrial camera continuously collects the surface image of the expansion joint under the cooperation of the LED light compensation module, and the ultrasonic detection sensor detects the internal defects of the expansion joint in real time; the positioning module synchronously obtains the position information of each detection point and transmits the position information to the data processing module.

[0039] 4. Data processing and feedback stage: the data processing module processes the detection data transmitted by the laser displacement sensor, high-definition industrial camera and ultrasonic detection sensor in real time, identifies surface damage, internal cracks and other diseases through built-in algorithms, and judges the severity of the diseases in combination with the preset disease level threshold; the processed detection data, position information and disease judgment result are transmitted to the remote monitoring platform through the wireless communication module, and stored in the local SD card; if the disease level reaches the preset threshold, the alarm module starts immediately, the red LED warning light flashes, and the buzzer emits an alarm sound, reminding the on-site staff to handle it in time.

[0040] 5. End stage: when the device moves to the end detection position of the expansion joint, the detection is automatically stopped, the staff turns off the device through the remote monitoring platform or on-site operation, pushes the device to the designated storage position, and backs up the detection data in the SD card to provide basis for subsequent maintenance work.

[0041] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A bridge joint detector apparatus, characterized by: The device comprises a mobile carrier, a driving mechanism, a cleaning mechanism, a multi-dimensional detection mechanism, a data processing module, a wireless communication module and a power supply module (25); The mobile carrier is used for carrying components of the device and moving along the bridge expansion joint, and the bottom of the mobile carrier is provided with a set of rollers; The driving mechanism is installed on the mobile carrier and can drive the rollers and the cleaning mechanism to operate; The multi-dimensional detection mechanism comprises a gap width detection unit, a surface state detection unit and an internal defect detection unit, the gap width detection unit adopts a laser displacement sensor, the surface state detection unit comprises a high-definition industrial camera and an LED light supplementing module, and the internal defect detection unit adopts an ultrasonic detection sensor, a vertically arranged expansion component (1) is installed on the mobile carrier, and the multi-dimensional detection mechanism is integrated at the expansion end of the expansion component (1); The data processing module is electrically connected with the multi-dimensional detection mechanism and the wireless communication module, is used for receiving and processing detection data, and is provided with an image recognition algorithm and a defect judgment model; The wireless communication module is used for realizing bidirectional transmission of detection data and a remote monitoring platform; The power supply module (25) provides working power supply for components of the device.

2. The bridge expansion joint detection apparatus of claim 1, wherein: The mobile carrier comprises a plate body (2), the set of rollers comprises two first rollers (3) arranged on the left and right sides of the front side and a second roller (4) arranged at the middle of the rear side, the first rollers (3) are rotationally connected to the bottom of the front side of the plate body (2) through first rotating shafts (5), and the second roller (4) is rotationally connected to the middle of the rear side of the plate body (2) through a second rotating shaft (6); A handle (7) is further installed on the rear side of the upper surface of the plate body (2).

3. The bridge expansion joint detection apparatus of claim 1, wherein: The driving mechanism comprises an engine (8), a third rotating shaft (9), a fourth rotating shaft (10) and a fifth rotating shaft (11), the output end of the engine (8) is fixedly connected with the third rotating shaft (9), the side walls of the third rotating shaft (9) and the fourth rotating shaft (10) are fixedly provided with a driving gear (12) and a driven gear (13) that are in mesh with each other, the outer sides of the driving gear (12) and the driven gear (13) are covered with a protective cover (14), and the third rotating shaft (9) and the fourth rotating shaft (10) are rotationally connected to the protective cover (14); One end of the third rotating shaft (9) is fixedly provided with a first driving pulley (15), one end of the fourth rotating shaft (10) is fixedly provided with a second driving pulley (16), the side wall of the first rotating shaft (5) is fixedly provided with a first driven pulley (17), the fifth rotating shaft (11) is rotationally connected to the mobile carrier, one end of the fifth rotating shaft (11) is fixedly provided with a second driven pulley (18), the first driving pulley (15) and the first driven pulley (17) are connected through a first transmission belt (19), and the second driving pulley (16) and the second driven pulley (18) are connected through a second transmission belt (20).

4. A bridge joint detector according to claim 3, wherein: The cleaning mechanism comprises a cleaning disc (21) and flexible cleaning plates (22) installed on the circumferential surface of the cleaning disc (21), the middle part of the cleaning disc (21) is coaxially fixedly sleeved on one end of the fifth rotating shaft (11), the cleaning disc (21) protrudes from the side of the moving carrier, the flexible cleaning plates (22) are uniformly circumferentially arranged along the axis of the cleaning disc (21), and the bottom of the cleaning disc (21) is lower than the running surface of the roller set; The device further comprises a dust suction assembly, the dust suction assembly is located at the rear side of the cleaning disc (21) and comprises a dust collector (23) fixedly installed on one side of the moving carrier, a dust suction pipe (24) of the dust collector (23) can extend into the expansion joint, and the cleaning disc (21), the dust suction assembly and the expansion joint assembly (1) are located on the same straight line.

5. The bridge joint detector of claim 1, wherein: The moving carrier is further provided with a positioning module, the positioning module adopts GPS / Beidou dual-mode positioning, is electrically connected with the data processing module, is used for acquiring detection position information and is associated with detection data.

6. The bridge joint detector of claim 1, wherein: The gap width detection unit comprises at least two laser displacement sensors and is symmetrically arranged along the width direction of the expansion joint.

7. The bridge joint detector of claim 1, wherein: The data processing module is connected with a data storage unit, the data storage unit is an SD card with a capacity not less than 100 GB, supports local data storage and export.

8. The bridge joint detector of claim 1, wherein: The device further comprises an alarm module, the alarm module is electrically connected with the data processing module, when it is detected that the disease level reaches a preset threshold, a staff member is reminded through an audible and visual alarm mode.

9. The bridge joint detector of claim 1, wherein: The power supply module (25) comprises a plurality of groups of rechargeable lithium battery groups and a charging interface, and the charging interface supports a fast charging function.

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