A rapid detection device for concrete hollowing

Abstract

The utility model relates to concrete detection equipment technical field especially relates to a kind of concrete hollowing rapid detection device.Its technical scheme includes: mainframe shell, the rear end of the mainframe shell is equipped with display screen, the front end central position of the mainframe shell is equipped with infrared camera, the periphery of the infrared camera is fixedly installed with annular partition frame, four sound wave receiving probes are symmetrically arranged in the both sides of the annular partition frame, and exciter is arranged in the middle position of four sound wave receiving probes.The utility model is equipped with synchronous control unit, realizes exciter and infrared camera time synchronization, makes sound wave and temperature parameter space-time matching, and heat sound coupling analysis unit is established by correlation analysis correlation model, uses hollowing area, sound wave reflection enhancement heating diffusion delay characteristic cross validation, overcomes the deficiency of single detection, improves identification accuracy and anti-interference ability, and is suitable for complex concrete structure detection.

Description

Technical Field

[0001] This utility model relates to the technical field of concrete testing equipment, and in particular to a rapid detection device for concrete hollow areas. Background Technology

[0002] In the field of concrete hollow detection, traditional methods are mainly divided into single acoustic wave detection and infrared thermal imaging detection. Single acoustic wave detection equipment relies on a vibrator to generate sound waves and receives reflected signals from a probe to determine hollow areas. However, it cannot combine temperature change information, resulting in low accuracy in identifying hollow areas in complex structures and poor anti-interference capabilities. Single infrared thermal imaging detection equipment only identifies hollow areas by collecting the temperature distribution on the concrete surface, making it difficult to capture the acoustic characteristics of the hollow area, and similarly suffers from insufficient identification accuracy.

[0003] Furthermore, traditional equipment lacks a synchronous control mechanism for the vibrator and infrared camera (if both are equipped), resulting in a mismatch between acoustic wave and temperature parameters in time and space, leading to poor data correlation. Additionally, traditional equipment lacks a dedicated isolation structure, allowing the heat radiation from the vibrator to easily interfere with the infrared camera, and signal crosstalk frequently occurs between the acoustic wave receiving probe and the thermal imaging module. In terms of stability, the connection between the acoustic wave receiving probe and the main body of traditional equipment is simple, lacking an elastic buffer structure, making it difficult to ensure stable contact with the concrete surface. The vibration force of the vibrator and operator hand tremors can severely affect detection accuracy, and the lack of ease of operation makes it difficult to meet the testing needs of complex concrete structures.

[0004] Therefore, we propose a rapid detection device for hollow concrete to solve the existing problems. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a rapid detection device for concrete hollow areas.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a rapid detection device for hollow concrete, comprising a main housing, a display screen at the rear end of the main housing, an infrared camera at the center of the front end of the main housing, an annular partition frame fixedly installed around the infrared camera, four acoustic wave receiving probes symmetrically arranged on both sides of the annular partition frame, and a vibrator arranged in the middle of the four acoustic wave receiving probes. The acoustic wave receiving probe is connected to the main unit housing via an elastic rod. An outer tube is fixedly connected to the rear end of the exciter. An inner rod is sleeved on the inner wall of the outer tube. The end of the inner rod away from the outer tube is locked to the inner wall of the main unit housing via a flange. A preload spring is fixedly connected to one end of the outer tube adjacent to the inner rod, and a rubber pad is fixedly connected to one end of the inner rod adjacent to the outer tube. The preload spring and the rubber pad are fixedly connected.

[0007] Preferably, the annular separator is made of heat-insulating material, and the height of the annular separator is higher than the lens of the infrared camera.

[0008] Preferably, the elastic rod includes a telescopic sleeve and a helical spring sleeved outside the telescopic sleeve.

[0009] Preferably, a mounting frame is fixedly installed on the outer side of the main unit housing, a spring rod is connected between the mounting frame and the grip frame, the grip frame is located at the front end of the display screen, and handles are provided on both sides of the grip frame, with control buttons provided on the inner side of the handles.

[0010] Preferably, the main control module is integrated inside the main housing, and the main control module includes a synchronization control unit, a thermo-acoustic coupling analysis unit, and a three-dimensional mapping unit.

[0011] Preferably, the synchronization control unit is configured as follows: Simultaneously, the vibrator is triggered to generate excitation sound waves and the infrared camera is activated to acquire a sequence of infrared thermal images of the concrete surface being tested.

[0012] Preferably, the thermoacoustic coupling analysis unit is configured as follows: Receives the acoustic wave signal from the acoustic wave receiving probe and the temperature data from the infrared camera; By analyzing the trigger time of the excitation sound wave, the sound wave signal can be obtained to obtain the sound wave propagation characteristic parameters; Analyze the infrared thermal image sequence to obtain temperature change characteristic parameters; By coupling the sound wave propagation characteristic parameters with the temperature change characteristic parameters through cross-correlation analysis, the hollow areas can be identified.

[0013] Preferably, the three-dimensional mapping unit is configured as follows: Receive the hollow identification result of the thermo-acoustic coupling analysis unit; The hollow drum identification results are superimposed with the spatial coordinates of the infrared thermal image sequence; Generate and output a 3D visualization model with hollow areas, where the hollow areas are distinguished from the normal areas by a preset color.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention achieves time synchronization between the vibrator and the infrared camera through a set synchronous control unit, enabling spatiotemporal matching of sound waves and temperature parameters. The thermoacoustic coupling analysis unit establishes a correlation model through cross-correlation analysis, and utilizes the characteristics of hollow areas, sound wave reflection enhancement, and heating diffusion delay for cross-verification. This overcomes the shortcomings of single detection, improves identification accuracy and anti-interference ability, and is suitable for the detection of complex concrete structures.

[0015] This invention utilizes a ring-shaped dividing frame to both block the transmission of heat radiation from the vibrator to the infrared camera and physically isolate the acoustic wave receiving probe from the thermal imaging module, preventing signal crosstalk. The retractable sleeve of the elastic rod and the helical spring, combined with the outer tube-inner rod, pre-compression spring, and rubber pad, form a dual stabilization mechanism, ensuring stable contact between the acoustic wave receiving probe and the concrete surface and absorbing vibration interference. The suspended grip structure, connected to the mounting frame and the grip frame by a spring rod, reduces the transmission of hand tremors. Combined with 3D visualization output, it balances detection accuracy and ease of operation, addressing the pain points of traditional equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the main structure of this utility model; Figure 3 This is a schematic diagram of the main control module structure of this utility model; Figure 4 This is a schematic diagram of the internal structure of the main body of this utility model; Figure 5 This is a cross-sectional structural diagram of the outer tube and inner rod of this utility model; Figure 6 This is a schematic diagram of the components of the main control module of this utility model.

[0017] Figure label: 1. Main unit housing; 2. Display screen; 3. Main control module; 4. Infrared camera; 5. Circular partition frame; 6. Acoustic wave receiving probe; 7. Elastic rod; 8. Vibrator; 9. Outer tube; 10. Inner rod; 11. Rubber pad; 12. Preload spring; 13. Flange; 14. Mounting frame; 15. Grip frame; 16. Spring rod; 17. Handle; 18. Control button; 19. Synchronization control unit; 20. Thermoacoustic coupling analysis unit; 21. Three-dimensional mapping unit. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1 like Figures 1-6 As shown, the present invention proposes a rapid detection device for concrete hollow areas, comprising a main housing 1, a display screen 2 at the rear end of the main housing 1, a main control module 3 integrated inside the display screen 2, an infrared camera 4 at the center of the front end of the main housing 1, an annular partition frame 5 fixedly installed around the infrared camera 4, four acoustic wave receiving probes 6 symmetrically arranged on both sides of the annular partition frame 5, a vibrator 8 at the middle of the four acoustic wave receiving probes 6, the acoustic wave receiving probes 6 being connected to the main housing 1 via elastic rods 7, an outer tube 9 fixedly connected to the rear end of the vibrator 8, an inner rod 10 sleeved on the inner wall of the outer tube 9, the end of the inner rod 10 away from the outer tube 9 being locked to the inner wall of the main housing 1 via a flange 13, a preload spring 12 fixedly connected to the end of the outer tube 9 adjacent to the inner rod 10, and a rubber pad 11 fixedly connected to the end of the inner rod 10 adjacent to the outer tube 9, the preload spring 12 being fixedly connected to the rubber pad 11.

[0020] During the testing process, the main housing 1 serves as the overall support structure. The integrated main control module 3 is responsible for coordinating the collaborative work of all components. The infrared camera 4 at the front center is used to collect infrared thermal images of the concrete surface being tested. The outer ring-shaped partition 5 physically isolates the infrared camera 4 from the four surrounding acoustic wave receiving probes 6 to avoid interference between acoustic waves and thermal imaging signals. The vibrator 8 generates excitation acoustic waves that act on the concrete surface. The acoustic wave receiving probes 6 maintain stable contact with the concrete surface through the buffering effect of the elastic rod 7, efficiently collecting reflected acoustic wave signals. The outer tube 9 at the rear end of the vibrator 8 is sleeved with the inner rod 10. The inner rod 10 is fixed to the inner wall of the main housing 1 through the flange 13. The preload spring 12 at the end of the outer tube 9 cooperates with the rubber pad 11 at the end of the inner rod 10 to absorb the recoil force of the vibrator 8 during operation and disperse the vibration energy to the main housing 1 through the outer tube 9-inner rod 10 structure, ensuring the overall testing stability. The display screen 2 at the rear end is used to display the test results in real time.

[0021] Example 2 like Figures 1-6As shown, the present invention proposes a rapid detection device for hollow concrete. Compared with Embodiment 1, this embodiment further includes: an annular partition frame 5 made of heat-insulating material, and its height is higher than the lens of the infrared camera 4. The heat-insulating material is selected from engineering plastics or glass fiber reinforced nylon, which can effectively block the heat radiation generated by the vibrator 8 during operation from being conducted to the infrared camera 4, avoiding thermal interference that affects the accuracy of the infrared thermal image. At the same time, the height of the annular partition frame 5 is higher than the lens of the infrared camera 4, forming a physical barrier to block thermal noise from the external environment, such as ambient temperature fluctuations and radiation from other heat sources. This further ensures the purity of the thermal imaging data by allowing the device to enter the acquisition range of the infrared camera 4.

[0022] The elastic rod 7 includes a telescopic sleeve and a helical spring fitted outside the telescopic sleeve. The telescopic sleeve provides the acoustic wave receiving probe 6 with axial displacement freedom, enabling it to adapt to the slight undulations of the concrete surface. The helical spring absorbs lateral vibrations and reduces probe tilting caused by shaking of the main housing 1 or unevenness of the concrete surface. The two work together to ensure that the acoustic wave receiving probe 6 always maintains a perpendicular contact with the concrete surface, ensuring the stability of acoustic wave signal acquisition and improving the signal-to-noise ratio.

[0023] A mounting frame 14 is fixedly installed on the outside of the main unit housing 1. A spring rod 16 is connected between the mounting frame 14 and the grip frame 15. The grip frame 15 is located at the front of the display screen 2, and handles 17 are provided on both sides of the grip frame 15. Control buttons 18 are provided on the inside of the handles 17. The mounting frame 14 and the grip frame 15 on the outside of the main unit housing 1 are connected by the spring rod 16 to form a floating grip structure.

[0024] When the operator grips the device through the handles 17 on both sides of the grip frame 15, the spring rod 16 can buffer the vibration generated by the natural shaking of the hand, and prevent the vibration from being transmitted to the main housing 1 and affecting the detection accuracy. The control button 18 on the inside of the handle 17 is directly electrically connected to the main control module 3, which makes it easy for the operator to quickly trigger the operation of components such as the vibrator 8 and the infrared camera 4 when holding it with one hand, so as to achieve real-time control.

[0025] The main control module 3 includes a synchronous control unit 19, a thermo-acoustic coupling analysis unit 20, and a three-dimensional mapping unit 21.

[0026] The synchronous control unit 19 is configured to simultaneously trigger the vibrator 8 to generate excitation sound waves and start the infrared camera 4 to acquire the infrared thermal image sequence of the concrete surface under test.

[0027] The synchronization control unit 19 in the main control module 3 is the core coordinating component. It triggers the vibrator 8 to generate excitation sound waves through a preset program and simultaneously starts the infrared camera 4 to start collecting infrared thermal image sequences of the concrete surface under test. This synchronization mechanism ensures that the generation of the excitation sound waves is completely consistent with the time origin of thermal imaging acquisition, laying the foundation for the spatiotemporal matching analysis of the sound wave signal and temperature data. The thermoacoustic coupling analysis unit 20 and the three-dimensional mapping unit 21 are responsible for data processing and result visualization, respectively, and work together with the synchronization control unit 19 to complete the entire process of hollow detection.

[0028] The thermo-acoustic coupling analysis unit 20 is configured to: receive the acoustic wave signal from the acoustic wave receiving probe 6 and the temperature data from the infrared camera 4; analyze the acoustic wave signal based on the trigger time of the excitation acoustic wave to obtain acoustic wave propagation characteristic parameters; analyze the infrared thermal image sequence to obtain temperature change characteristic parameters; and identify hollow areas by coupling the acoustic wave propagation characteristic parameters and temperature change characteristic parameters through cross-correlation analysis. The workflow of the thermo-acoustic coupling analysis unit 20 is as follows: Data reception: Simultaneously receive the acoustic signal collected by the acoustic receiving probe 6 and the temperature data output by the infrared camera 4; Acoustic wave parameter extraction: Based on the triggering time of the excitation acoustic wave, analyze the time domain (such as propagation speed and attenuation rate) and frequency domain (such as spectral distortion) characteristics of the acoustic wave signal to obtain acoustic wave propagation characteristic parameters; Temperature parameter extraction: Frame-by-frame analysis of the infrared thermal image sequence is performed to calculate the temperature change rate and peak temperature of each pixel on the concrete surface, thereby obtaining temperature change characteristic parameters. Coupling identification: A correlation model between sound wave propagation characteristic parameters and temperature change characteristic parameters is established through cross-correlation analysis. Due to the presence of an air layer inside the hollow area, sound wave reflection is enhanced and heat diffusion velocity is delayed, resulting in a significant correlation peak in the correlation model. Based on this, the hollow area can be accurately identified.

[0029] The 3D mapping unit 21 is configured to: receive the hollow area identification results from the thermoacoustic coupling analysis unit 20; superimpose the hollow area identification results with the spatial coordinates of the infrared thermal image sequence; generate and output a 3D visualization model with hollow area distribution, wherein the hollow area is distinguished from the normal area by a preset color. The working process of the 3D mapping unit 21 is as follows: Receive the hollow drum identification results (including the location and range of the hollow drum) output by the thermo-acoustic coupling analysis unit 20; Spatial coordinate overlay: The two-dimensional coordinates of the hollow drum identification result are precisely aligned with the spatial coordinate system of the infrared thermal image sequence to achieve spatial matching between the hollow drum information and the original thermal imaging data; 3D model generation: The depth information of the concrete surface is integrated (extracted from thermal image sequences or preset by algorithms) to construct a 3D visualization model containing the distribution of voids. The void areas are highlighted according to preset rules (such as red) to form a clear visual distinction from the normal areas. Output results: The 3D model is transmitted to the display screen 2 in real time, which intuitively presents the spatial location, size and distribution of the hollow area, making it easy for inspectors to interpret quickly.

[0030] Working principle: When operators conduct concrete hollowness detection, they first grasp the handles 17 on both sides of the grip frame 15 with both hands. At this time, the spring rod 16 between the mounting frame 14 and the grip frame 15 forms a suspended grip structure, which can initially buffer the vibration caused by natural hand shaking and prevent the vibration from being transmitted to the main housing 1 and affecting the subsequent detection accuracy. After preparation, the operator starts the equipment through the control button 18 inside the handle 17. The control button 18 is directly electrically connected to the main control module 3 integrated inside the main housing 1, which can quickly trigger each component to enter the working state. The synchronization control unit 19 in the main control module 3 then plays a core coordinating role, simultaneously triggering the vibrator 8 to generate excitation sound waves through a preset program, and simultaneously activating the infrared camera 4 at the center of the front end of the main housing 1, so that it begins to collect the infrared thermal image sequence of the concrete surface being tested. This synchronization mechanism ensures that the generation of the excitation sound wave and the time origin of the thermal imaging acquisition are completely consistent, laying the foundation for subsequent data processing. When the excitation sound wave generated by the vibrator 8 acts on the concrete surface, it generates a recoil force. At this time, the sleeve structure between the outer tube 9 and the inner rod 10, which are fixedly connected to the rear end of the vibrator 8, begins to function. The end of the inner rod 10 away from the outer tube 9 is locked to the inner wall of the main housing 1 through the flange 13. The preload spring 12 at the end of the outer tube 9 adjacent to the inner rod 10 and the rubber pad 11 at the end of the inner rod 10 adjacent to the outer tube 9 cooperate to absorb the recoil force of the vibrator 8 during operation and disperse the vibration energy to the main housing 1 through the outer tube 9-inner rod 10 structure, ensuring the stability of the overall detection. While the vibrator 8 is working, four acoustic wave receiving probes 6, symmetrically arranged on both sides of the annular partition frame 5, begin to collect reflected acoustic wave signals. The acoustic wave receiving probe 6 is connected to the main housing 1 via an elastic rod 7. The elastic rod 7 consists of a telescopic sleeve and a helical spring fitted around it. The telescopic sleeve provides the acoustic wave receiving probe 6 with axial displacement freedom, allowing it to adapt to the slight undulations of the concrete surface. The helical spring absorbs lateral vibrations, reducing probe tilting caused by shaking of the main housing 1 or unevenness of the concrete surface. Together, they ensure that the acoustic wave receiving probe 6 always maintains perpendicular contact with the concrete surface, improving the signal-to-noise ratio of the acoustic wave signal. When the infrared camera 4 acquires infrared thermal image sequences, its peripherally fixed annular separator 5 plays a crucial role. The annular separator 5 is made of engineering plastics or heat-insulating materials such as fiberglass-reinforced nylon, effectively blocking the heat radiation generated by the vibrator 8 during operation from being conducted to the infrared camera 4. Furthermore, its height is higher than the lens of the infrared camera 4, forming a physical barrier that prevents thermal noise from the external environment from entering the acquisition range of the infrared camera 4, ensuring the purity of the thermal imaging data. Meanwhile, the annular separator 5 physically isolates the infrared camera 4 from the surrounding acoustic wave receiving probe 6, preventing mutual interference between the acoustic wave and thermal imaging signals. Subsequently, the thermoacoustic coupling analysis unit 20 in the main control module 3 begins to work, synchronously receiving the acoustic wave signal collected by the acoustic wave receiving probe 6 and the temperature data output by the infrared camera 4.Using the trigger time of the excitation sound wave as a benchmark, the thermoacoustic coupling analysis unit 20 analyzes the time and frequency domain characteristics of the sound wave signal to obtain sound wave propagation characteristic parameters. It then performs frame-by-frame analysis of the infrared thermal image sequence, calculating the temperature change rate and peak temperature of each pixel on the concrete surface to obtain temperature change characteristic parameters. Furthermore, it establishes a correlation model between the two through cross-correlation analysis. The presence of an air layer in the hollow area leads to enhanced sound wave reflection and delayed heat diffusion, resulting in a significant correlation peak in the correlation model, thus accurately identifying the hollow area. Finally, the three-dimensional mapping unit 21 receives the hollow area identification result output by the thermoacoustic coupling analysis unit 20, precisely aligns the two-dimensional coordinates of the hollow area identification result with the spatial coordinate system of the infrared thermal image sequence, and integrates the depth information of the concrete surface to construct a three-dimensional visualization model containing the hollow area distribution. The hollow area is highlighted with a specific color according to preset rules, forming a clear visual distinction from the normal area. The three-dimensional model is transmitted in real time to the display screen 2 at the rear of the main unit housing 1, intuitively presenting the spatial location, size, and distribution pattern of the hollow areas, facilitating rapid interpretation by inspection personnel.

[0031] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rapid detection device for hollow concrete, comprising a main housing (1), characterized in that: The rear end of the main unit housing (1) is provided with a display screen (2), and the front center of the main unit housing (1) is provided with an infrared camera (4). An annular partition frame (5) is fixedly installed around the infrared camera (4). Four sound wave receiving probes (6) are symmetrically arranged on both sides of the annular partition frame (5), and an exciter (8) is arranged in the middle of the four sound wave receiving probes (6). The acoustic wave receiving probe (6) is connected to the main housing (1) via an elastic rod (7). The rear end of the vibrator (8) is fixedly connected to an outer tube (9). An inner rod (10) is sleeved on the inner wall of the outer tube (9). The end of the inner rod (10) away from the outer tube (9) is locked to the inner wall of the main housing (1) via a flange (13). A preload spring (12) is fixedly connected to one end of the outer tube (9) near the inner rod (10), and a rubber pad (11) is fixedly connected to one end of the inner rod (10) near the outer tube (9). The preload spring (12) is fixedly connected to the rubber pad (11).

2. The rapid detection device for concrete hollow areas according to claim 1, characterized in that: The annular partition (5) is made of heat-insulating material, and the height of the annular partition (5) is higher than the lens of the infrared camera (4).

3. The rapid detection device for concrete hollow areas according to claim 1, characterized in that: The elastic rod (7) includes a telescopic sleeve and a helical spring sleeved outside the telescopic sleeve.

4. The rapid detection device for concrete hollow areas according to claim 1, characterized in that: A mounting frame (14) is fixedly installed on the outside of the main unit housing (1). A spring rod (16) is connected between the mounting frame (14) and the grip frame (15). The grip frame (15) is located at the front end of the display screen (2). Handles (17) are provided on both sides of the grip frame (15). A control button (18) is provided on the inside of the handle (17).

5. The rapid detection device for concrete hollow areas according to claim 1, characterized in that: The main control module (3) is integrated inside the main housing (1). The main control module (3) includes a synchronization control unit (19), a thermo-acoustic coupling analysis unit (20), and a three-dimensional mapping unit (21).

6. The rapid detection device for concrete hollow areas according to claim 5, characterized in that: The synchronization control unit (19) is configured as follows: Simultaneously, the vibrator (8) is triggered to generate excitation sound waves and the infrared camera (4) is activated to collect the infrared thermal image sequence of the concrete surface being tested.

7. The rapid detection device for concrete hollow areas according to claim 6, characterized in that: The thermoacoustic coupling analysis unit (20) is configured as follows: Receives the acoustic signal from the acoustic receiving probe (6) and the temperature data from the infrared camera (4); By analyzing the trigger time of the excitation sound wave, the sound wave signal can be obtained to obtain the sound wave propagation characteristic parameters; Analyze the infrared thermal image sequence to obtain temperature change characteristic parameters; By coupling the sound wave propagation characteristic parameters with the temperature change characteristic parameters through cross-correlation analysis, the hollow areas can be identified.

8. A rapid detection device for concrete hollow areas according to claim 5, characterized in that: The three-dimensional mapping unit (21) is configured as follows: Receive the hollow drum identification result from the thermo-acoustic coupling analysis unit (20); The hollow drum identification results are superimposed with the spatial coordinates of the infrared thermal image sequence; Generate and output a 3D visualization model with hollow areas, where the hollow areas are distinguished from the normal areas by a preset color.

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