Urban road surface flaw detector and terminal thereof

Abstract

The application discloses a kind of urban road surface flaw detector and its terminal in the detection instrument field, to overcome the defect that buffer assembly return direction is not specific in prior art, so that sensor is separated from contact with deflection basin, to overcome the above problems, the technical scheme includes the stable platform of being located above and the bearing station of being located below, stroke lever is wrapped with gravity hammer, the surface of bearing station is equipped with buffer assembly;The buffer assembly is sequentially divided into rubber layer, tension spring layer and point touch layer from top to bottom, the tension spring layer is with a plurality of sets of tension spring in opposition, the rubber layer has cylindrical protrusion, protrusion is enclosed rectangle matrix along the center of rubber layer, since the contact time of gravity hammer and rubber layer is larger, the return direction of tension spring is limited, so when tension spring returns, it can only return to the direction away from rubber layer, simultaneously increase the measurement time of first inductor, facilitate the correctness of data collection.

Description

Technical Field

[0001] This invention belongs to the field of testing instruments, specifically a road surface flaw detector and its terminal. Background Technology

[0002] With the increasing mileage of expressways in my country, the scientific management of expressways has received growing attention. Allowable deflection is a crucial indicator in pavement technical design. The falling weight deflectometer (FWD), a dynamic testing device, is gaining increasing acceptance for non-destructive testing of subgrade and pavement deflection, and significant progress has been made in its development and application. The FWD measures the dynamic deflection of the pavement and can inversely calculate its resilient modulus. my country's "Specifications for Field Testing of Highway Subgrade and Pavement" (Ⅲ059-95) has also listed the FWD as a deflection testing device, which is of significant practical importance for further developing and utilizing the FWD, fully leveraging its advantages, and accurately evaluating the structural condition of the pavement.

[0003] Due to their inherent design principles, the calibration parameters of the deflection and load sensors in a falling weight deflectometer can drift over time, leading to inaccurate test data. Without timely recalibration, the accuracy of the data cannot be guaranteed, directly impacting the impartiality of the testing process. As pavement deflection is a crucial indicator for evaluating road quality, accurate and reliable test data is essential, requiring manufacturers to possess accurate calibration platforms.

[0004] To overcome the above-mentioned defects, the existing technical solution with the publication number CN104313987A discloses a mobile calibration device for a falling weight deflectometer. In addition to the portability, economy and ease of use of the aforementioned mobile calibration device, this device has a simple calibration method with low computational load. The calibration coefficient between the calibration device and the output deflection of the deflectometer is the ratio of the two, which can achieve rapid and mobile calibration.

[0005] However, in the above scheme, the buffer layer component rebounds towards both ends after the pressure is removed. Given this rebound method, it may cause the sensor to lose contact with the sinker, or the entire device to rebound upwards, resulting in data errors. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide an urban road surface flaw detection detector that limits the return direction of the buffer component to increase measurement accuracy.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: A road surface flaw detector includes an upper stabilizing platform and a lower bearing platform, a vertical travel rod is connected between the stabilizing platform and the bearing platform, the travel rod is wrapped with a gravity hammer, and a buffer assembly is provided on the surface of the bearing platform.

[0008] The buffer assembly is divided into a rubber layer, a tension spring layer and a contact layer from top to bottom. The tension spring layer contains several opposing sets of tension springs. The rubber layer has cylindrical protrusions that form a rectangular matrix along the center of the rubber layer. The protrusions are located in the gaps of the tension springs, and the distance between the protrusions is less than half the height of the protrusions.

[0009] It also includes a rubber cup assembly located below the support platform, wherein the rubber cup assembly has a first sensor at its vertical central axis and the first sensor is located directly below the center of the rubber layer.

[0010] The above-mentioned scheme achieves the following beneficial effects: 1. Compared with the existing ultrasonic measurement technology, this scheme uses a gravity hammer to apply pressure to the bearing platform, thereby releasing the pulse load, which causes the road surface to deform instantaneously. The degree of deformation is then analyzed to form a deflection basin. The bearing capacity of the road surface is evaluated based on the deflection basin, and the road surface is tested for damage by comparing conventional data.

[0011] Compared to existing technologies that use pulse load release, this technical solution uses a rectangular matrix of protrusions. When the protrusions are impacted by a gravity hammer, they flatten out. Since the distance between the protrusions is less than half the height of the protrusions, adjacent protrusions form interconnected flat pockets. At this time, the air pressure inside the flat pockets decreases due to the impact of the gravity hammer, creating a negative pressure. This negative pressure attracts the gravity hammer, increasing the contact time between the gravity hammer and the rubber layer, thereby mitigating the impact of the gravity hammer and extending its service life. At the same time, the increased contact time between the gravity hammer and the rubber layer restricts the return direction of the tension spring. Therefore, when the tension spring returns (with the moment when the gravity hammer is about to leave the rubber layer as the return node), it can only return in a direction away from the rubber layer. This further brings the first sensor of the cup assembly closer to the deformed road surface, improving the measurement accuracy. It also increases the measurement time of the first sensor, facilitating the correctness of data collection.

[0012] Compared with the existing technology that limits the single return stroke of the tension spring, this technical solution uses a cup assembly to protect the first sensor, thereby improving the service life of the first sensor.

[0013] Furthermore, one side of the protrusion has a circular hole, and the center of the rectangular matrix has a through hole. A guide tube, which is a flexible tube, connects the circular hole to the through hole.

[0014] Preferably, the round hole is located in the middle of the protrusion.

[0015] Beneficial effects: Compared with existing technologies that improve accuracy, this technical solution utilizes the circular hole and guide tube to operate the intake and exhaust time. The time operation is as follows: In this technical solution, since the rubber itself is elastic, when the rubber is squeezed, the airflow flows out of the through hole along the circular hole to realize the exhaust operation. Subsequently, due to the continuous compression of the protrusion, the through hole is closed. When the protrusion returns to its original position, the through hole opens. Under the influence of the internal negative pressure, the external atmospheric pressure enters the rectangular matrix through the through hole to fill it.

[0016] Furthermore, the stabilizing platform is equipped with an electromagnet that controls the lifting and lowering of the gravity hammer.

[0017] Beneficial effect: Facilitates the lifting and lowering of the electromagnet.

[0018] Furthermore, the cup assembly is reinforced with a reinforcing rib between itself and the support platform. The reinforcing rib converges along the support platform to the cup assembly, and the connection surface between the cup assembly and the reinforcing rib is covered with a metal layer.

[0019] Beneficial effect: Reinforcing ribs help extend the lifespan of the cup assembly.

[0020] Furthermore, the point contact layer includes an arc column connected to a tension spring, and the arc column makes point contact with the support platform.

[0021] Beneficial effects: Facilitates the conversion of surface torque to point torque transmission, enhancing penetration.

[0022] Furthermore, it includes a deformation sensor, a data processor, a memory, and an output device, wherein the number of deformation sensors is eight, and the deformation sensors are arranged in a straight line around the first sensor.

[0023] Beneficial effects: Data can be classified and stored, and the measurement range of the sensors can be divided into regions. When the wavelength of a certain region is in error, the region can be circled for crack repair. At the same time, the speed of pulse load transmission and the time it takes to reach the sensor can be used to mark the area. Circles can be drawn on a scaled map with the radius of the circle being the product of the speed and the time it takes to receive feedback from the sensor. The intersection of the two circles around two adjacent deformation sensors is the approximate range of the crack.

[0024] Furthermore, the data storage is connected in parallel with the memory, deformation sensor, central sensor, and output device, the output device including a display and a printer.

[0025] Beneficial effect: Facilitates the printing and analysis of data.

[0026] Furthermore, the travel lever is a hydraulic lever.

[0027] Beneficial effect: The height of the gravity hammer can be changed by using a hydraulic rod. Attached Figure Description

[0028] Figure 1 This is an overall schematic diagram of an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Connection diagram of a medium gravity hammer;

[0030] Figure 3 for Figure 1 Side view of the buffer assembly;

[0031] Figure 4 for Figure 3 Top view. Detailed Implementation

[0032] The following detailed description illustrates the specific implementation method:

[0033] The reference numerals in the accompanying drawings include: 1. Stable platform; 2. Bearing platform; 3. Stroke rod; 4. Electromagnet; 5. Gravity hammer; 6. Buffer assembly; 7. Rubber layer; 8. Tension spring layer; 9. Point contact layer; 10. Protrusion; 11. Circular hole; 12. Through hole; 13. Guide tube; 14. Arc column; 15. Leather cup assembly; 16. First sensor; 17. Reinforcing rib; 18. Ground; 19. Traction vehicle; 20. Deflection basin; 21. Deformation sensor. Example

[0034] The basic implementation examples are as follows: Figure 1 and attached Figure 2 As shown: A road surface flaw detector is connected to a tractor 19 on a driving ground 18, including a stabilizing platform 1 located above and a bearing platform 2 located below. A vertical travel rod 3 is connected between the stabilizing platform 1 and the bearing platform 2. The stabilizing platform 1 is equipped with an electromagnet 4 that controls the lifting and lowering of a gravity hammer 5. The travel rod 3 covers the gravity hammer 5. A buffer assembly 6 is provided on the surface of the bearing platform 2.

[0035] Please refer to Figure 3 and Figure 4 The buffer assembly 6 is divided into a rubber layer 7, a tension spring layer 8, and a point contact layer 9 from top to bottom. The tension spring layer 8 contains several opposing sets of tension springs. The rubber layer 7 has cylindrical protrusions 10, which form a rectangular matrix along the center of the rubber layer 7. The protrusions 10 are located in the gaps of the tension springs, and the distance between the protrusions 10 is less than half the height of the protrusions 10. One side of the protrusion 10 has a circular hole 11, and the center of the rectangular matrix has a through hole 12. A guide tube 13 is connected from the circular hole 11 to the through hole 12. The guide tube 13 is a flexible tube. The point contact layer 9 includes an arc column 14 that connects to the tension springs. The arc column 14 makes point contact with the support platform 2.

[0036] It also includes a cup assembly 15 located below the support platform 2. The cup assembly 15 has a first sensor 16 at its vertical central axis and is located directly below the center of the rubber layer 7. The cup assembly 15 and the support platform have a reinforcing rib 17. The reinforcing rib 17 converges along the support platform to the cup assembly 15, and the connection surface between the cup assembly 15 and the reinforcing rib 17 has a metal layer.

[0037] The specific implementation process is as follows: The operator first adjusts the lifting height of the gravity hammer 5 using a hydraulic rod, and then controls the descent of the gravity hammer 5 by turning on the electromagnet 4 and disconnecting the battery iron. During the descent, the gravity hammer 5 applies pressure to the bearing platform 2, thereby releasing the pulse load. The gravity hammer 5 presses down on the bearing platform 2, thereby causing instantaneous deformation of the road surface. During the deformation process, the ground 18 forms a deflection basin 20. Then, the bearing capacity of the road surface is evaluated based on the deflection basin 20, and whether the road surface is damaged is detected by comparing conventional data.

[0038] When the gravity hammer 5 contacts the rubber layer 7, the rubber layer 7 has a rectangular matrix formed by protrusions 10. Therefore, when the protrusions are impacted by the gravity hammer 5, they flatten. Since the distance between the protrusions 10 is less than half the height of the protrusions 10, adjacent protrusions form interconnected flat pockets. The gas inside the flat pockets flows into the guide pipe 13 through the through hole 12 and is discharged along the through circular hole 11. At this time, the flat pockets become concave bowl-shaped, facilitating the integration and output of airflow. The impact of the gravity hammer 5 reduces the air pressure inside the flat pockets, creating a negative pressure. This negative pressure counteracts the force of gravity. The attraction force generated by hammer 5 increases the contact time between the gravity hammer 5 and the rubber layer 7, thereby mitigating the impulse of the gravity hammer 5 and extending its service life. Simultaneously, the increased contact time between the gravity hammer 5 and the rubber layer 7 restricts the return direction of the tension spring. Therefore, when the tension spring returns (taking the instant the gravity hammer 5 is about to leave the rubber layer 7 as the return node), it can only return in a direction away from the rubber layer 7. This further brings the first sensor 16 of the cup assembly 15 closer to the deformed road surface, improving measurement accuracy and increasing the measurement time of the first sensor 16, facilitating accurate data collection. At the same time, the cup assembly 15 protects the first sensor 16, extending its service life.

[0039] This technical solution utilizes the circular hole 11 and guide tube 13 to operate the time of air intake and exhaust. The time operation is as follows: In this technical solution, since the rubber itself is elastic, when the rubber is squeezed, the airflow flows out of the through hole 12 along the circular hole 11 to realize the exhaust operation. Subsequently, due to the continuous compression of the protrusion 10, the through hole 12 is closed. When the protrusion 10 returns to its original position, the through hole 12 opens. Under the influence of the internal negative pressure, the external atmospheric pressure enters the rectangular matrix through the through hole 12 to fill it, thereby relieving the negative pressure of the flat pocket.

[0040] The operator then controls the hydraulic rod to lift the gravity hammer 5, and then uses the electromagnet 4 to energize it, thereby keeping the gravity hammer 5 stable. In this state, the operator can adjust the height to change the descent stroke of the gravity hammer 5, so as to measure multiple sets of data as a control group to ensure the accuracy of the data. Example

[0041] The difference between this embodiment and the above embodiment is that this embodiment discloses an urban road surface flaw detection terminal including a deformation sensor 21, a data processor, a memory, and an output device. The number of deformation sensors 21 is 8, and the deformation sensors 21 are connected to a measuring beam. The deformation sensors 21 are arranged in a straight line around the first sensor 16. The data memory is connected in parallel with the memory, deformation sensors 21, central sensor, and output device. The output device includes a display and a printer. The stroke rod 3 is a hydraulic rod.

[0042] The specific implementation process is as follows: Adjust the mass and height of the gravity hammer 5 and control the load of the hammer to level four. Then, arrange measuring points on the road surface. When arranging the measuring points, lower the side beam to facilitate the equal distribution of the measuring points. Then, load the measured data into the memory. The operator classifies the memory and then compares the theoretical value with the actual value. When the wavelength range of the actual value is much lower than the theoretical value, the error area is divided according to the sensor feedback information. This area is circled for crack repair. At the same time, the speed of pulse load transmission and the time of transmission to the sensor can be marked. Draw a circle on the scale map. The radius of the circle is the product of the speed and the time of receiving the sensor feedback. The two adjacent deformation sensors 21 are the center of the circle. When the two circles intersect, it is the approximate range of the crack.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A road surface flaw detection detector, characterized in that: It includes an upper stabilizing platform and a lower bearing platform, with a vertical travel rod connecting the stabilizing platform and the bearing platform. The travel rod is wrapped with a gravity hammer, and the surface of the bearing platform is provided with a buffer assembly. The buffer assembly is divided into a rubber layer, a tension spring layer, and a point contact layer from top to bottom. The tension spring layer contains several opposing sets of tension springs. The rubber layer has cylindrical protrusions that form a rectangular matrix along the center of the rubber layer. The protrusions are located in the gaps of the tension springs, and the distance between the protrusions is less than half the height of the protrusion. One side of each protrusion has a circular hole, and the center of the rectangular matrix has a through hole. A guide tube, which is a flexible tube, connects the circular hole to the through hole. The point contact layer includes an arc column that connects to the tension springs, and the arc column makes point contact with the support platform. Because the protrusions form a rectangular matrix, they flatten when impacted by a gravity hammer. Since the distance between the protrusions is less than half the height of the protrusions, adjacent protrusions form interconnected flat pockets. The gas in the flat pockets flows into the guide tube through the round holes and is discharged along the through holes. Due to the continuous compression of the protrusions, the through holes are closed. When the protrusions return to their original position, the through holes open. Under the influence of the internal negative pressure, the external atmospheric pressure enters the rectangular matrix through the through holes and fills it. It also includes a rubber cup assembly located below the support platform, wherein the rubber cup assembly has a first sensor at its vertical central axis and the first sensor is located directly below the center of the rubber layer.

2. The urban road surface flaw detection detector according to claim 1, characterized in that: The stabilizing platform is equipped with an electromagnet that controls the lifting and lowering of the gravity hammer.

3. The urban road surface flaw detection detector according to claim 1, characterized in that: The cup assembly is reinforced with a reinforcing rib between itself and the support platform. The reinforcing rib converges along the support platform to the cup assembly, and the connection surface between the cup assembly and the reinforcing rib has a metal layer.

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