A crack depth gauge

Abstract

The application relates to the field of building detection, in particular to a crack depth detector, which comprises a host computer, a transmitting transducer, a receiving transducer and an adjusting rod, the transmitting transducer and the receiving transducer are electrically connected with the host computer, the transmitting transducer and the receiving transducer are symmetrically distributed on the two sides of the adjusting rod with the central axis of the adjusting rod as the axis of symmetry and in mirror image according to a preset standard interval, and the detection ends of the transmitting transducer and the receiving transducer are provided with adsorption heads adsorbed on the building surface. The structure can improve the convenience and accuracy of crack testing, does not need to rely on manual marking of measurement points and manual adjustment of the measurement positions of the transmitting transducer and the receiving transducer, and effectively avoids movement of the transmitting transducer and the receiving transducer in the measurement process.

Description

Technical Field

[0001] This application relates to the field of building inspection, and in particular to a crack depth measuring instrument. Background Technology

[0002] Crack depth testing plays a crucial role in the field of structural health monitoring, as it is essential for the timely detection of potential safety hazards and the assessment of structural stability and durability. With the booming development of the construction industry, various types of building structures are emerging, increasing in scale and complexity, making the need for structural health monitoring increasingly urgent. The appearance of cracks can lead to a decrease in structural load-bearing capacity, potentially causing serious safety accidents. Therefore, accurate and reliable crack depth testing provides a scientific basis for the maintenance, reinforcement, and repair of building structures, ensuring their normal use and long-term safety. This makes crack depth testing technology one of the important means of ensuring building safety, as its accuracy and reliability are directly related to the quality and safety of the building. Common methods for crack depth testing include drilling and ultrasonic methods. The drilling method involves directly drilling holes in the building structure and determining the crack depth by measuring the hole depth; this method is simple and direct. Ultrasonic measurement using a crack depth sounder is also a common method. A traditional crack depth sounder consists of a transmitting transducer, a receiving transducer, and a main unit. Measurement points are marked on both sides of the crack using a measuring ruler at a standard distance. The transmitting and receiving transducers are then symmetrically arranged pairwise at these points on both sides of the crack for measurement. This method primarily utilizes the principle of ultrasonic crack depth measurement, based on the diffraction phenomenon that occurs when ultrasonic waves encounter cracks in media such as concrete. The crack depth is calculated by measuring the sound time difference and combining it with the wave velocity. This method is suitable for detecting relatively deep cracks, especially for building structures with only one measurable surface. However, existing crack depth sounders have significant drawbacks. On the one hand, for different standard distances, the main reliance is on manually marking measurement points and manually adjusting the measurement positions of the transmitting and receiving transducers. The operation process is cumbersome, and it is difficult to guarantee the accuracy of each adjustment. This not only reduces the testing efficiency but also affects the accuracy of the measurement results. On the other hand, since experienced personnel are required to closely attach the transmitting and receiving transducers to the building surface of the point to be measured, the transmitting and receiving transducers may move during the measurement process. It is impossible to ensure that the transmitting and receiving transducers are fixed, resulting in insufficient measurement accuracy. Utility Model Content

[0003] In order to improve the convenience and accuracy of crack testing, eliminate the need for manual marking of measurement points and manual adjustment of the measurement positions of the transmitting and receiving transducers, and effectively avoid the movement of the transmitting and receiving transducers during the measurement process, this application provides a crack depth sounder.

[0004] This application provides a crack depth sounder, including a main unit, a transmitting transducer, a receiving transducer, and an adjusting rod. Both the transmitting and receiving transducers are electrically connected to the main unit. The transmitting and receiving transducers are mirror-symmetrically distributed on both sides of the adjusting rod with a preset standard spacing, using the central axis of the adjusting rod as the axis of symmetry. The detection ends of both the transmitting and receiving transducers are equipped with adsorption heads that attach to the building surface. By adopting this technical solution, the transmitting and receiving transducers are mirror-symmetrically distributed on both sides of the adjusting rod with a preset standard spacing, avoiding the tedious operation of manually marking measurement points and adjusting measurement positions, and solving the problem of difficulty in ensuring accuracy during manual adjustment. This improves testing efficiency. Simultaneously, the precise setting of the preset standard spacing ensures that the transmitting and receiving transducers are accurately positioned in suitable measurement locations, guaranteeing the standardization of measurements and thus improving the accuracy of the measurement results. Furthermore, both the transmitting and receiving transducers are equipped with adsorption heads that attach to the building surface. During measurement, these adsorption heads firmly fix the transmitting and receiving transducers to the building surface, preventing movement and improving the accuracy of contact between the transducers and their detection ends. This avoids measurement data deviations caused by manual fixation or movement, effectively improving measurement accuracy. Preferably, the adjusting rod is divided into two or more individual rod segments, with adjacent segments hinged together. By adopting the above technical solution, the adjusting rod is divided into two or more individual rod segments, with adjacent segments hinged together, allowing for flexible bending and easy storage and carrying. Preferably, the adjusting rod is divided into two individual rod segments, which slide against each other via a telescopic structure. By adopting the above technical solution, the adjusting rod is divided into two individual rod segments, and these segments slide against each other via a telescopic structure. In actual crack depth measurements, different crack measurements may require different standard spacings. Traditional methods rely on manually marking measurement points and adjusting positions, which is cumbersome and difficult to guarantee accuracy. This telescopic structure design allows for flexible adjustment of the relative positions of the two rod segments according to actual needs, thereby changing the distance between the transmitting and receiving transducers to quickly and accurately reach the preset standard distance. This eliminates the need for repeated manual marking and adjustment, avoiding errors from manual operation and improving testing efficiency and measurement accuracy. Preferably, the telescopic structure includes a sleeve and telescopic balls. The sleeve is slidably connected to the two rod segments at both ends. The inner wall of the sleeve has a groove and several positioning holes, which are axially spaced at fixed intervals L. Telescopic balls are movably mounted on the outer walls of the two rod segments, sliding along the grooves to extend beyond any of the positioning holes.By adopting the above technical solution, since the two ends of the sleeve are slidably connected to the two rod segments, and the inner wall of the sleeve has a groove and several positioning holes spaced at fixed intervals L along the axis, the telescopic balls on the outer walls of the two rod segments can slide along the groove. When the telescopic balls slide to extend out of any positioning hole, the two rod segments can be relatively fixed at that position, realizing the adjustment and fixation of the rod length. This allows for quick and accurate adjustment of the distance between the transmitting and receiving transducers, avoiding the tedious operation of manually marking measurement points and adjusting positions, thus improving testing efficiency and the accuracy of measurement results. Preferably, there are four transmitting and four receiving transducers, all arranged at a fixed interval L along the axis of the adjusting rod. By adopting the above technical solution, when measuring crack depth, a scheme with four transmitting and four receiving transducers arranged at a fixed interval L along the axis of the adjusting rod is directly provided. Compared with a single set of transmitting and receiving transducers, this facilitates rapid testing of ultrasonic propagation data at different locations. Preferably, the adsorption head is a circular suction cup structure with an adapter hole at its center. The detection ends of the transmitting and receiving transducers can pass through the adapter hole and be interference-fitted with the suction cup. By adopting the above technical solution, the adsorption head uses a circular suction cup structure with an adapter hole at its center, through which the detection ends of the transmitting and receiving transducers pass and are interference-fitted with the suction cup. When the circular suction cup structure contacts the building surface, it forms a closed space. When the suction cup is pressed to expel the internal air, the external atmospheric pressure will press the suction cup firmly against the building surface, thus achieving a firm adsorption. This adsorption method allows the transmitting and receiving transducers to be stably fixed on the building surface at the measurement point during the measurement process, avoiding the problem of insufficient measurement accuracy caused by manual movement of the transmitting and receiving transducers, thereby improving the accuracy of the measurement. Preferably, both the transmitting transducer and the receiving transducer are rotatably mounted on the adjusting rod via an installation structure, and the adsorption heads at the detection ends of the transmitting and receiving transducers can be rotated to contact the building surface. By adopting the above technical solution, the transmitting and receiving transducers can be rotated around the adjusting rod via the installation structure. When it is necessary to inspect the building surface, the adsorption heads at the detection ends of the transmitting and receiving transducers can be flexibly rotated to contact the building surface, improving the convenience of inspection. Preferably, the installation structure includes a housing and a hinge seat. The housing has an internal cavity structure, the hinge seat is disposed on the surface of the adjusting rod, and the housing is hinged to the hinge seat. The transmitting and receiving transducers are fixedly mounted on the cavity structure of the housing. The housing has a through hole through which the detection ends of the transmitting and receiving transducers pass.By adopting the above technical solution, since the installation structure includes a shell with a cavity structure and a hinge seat on the surface of the adjusting rod, and the shell is hinged to the hinge seat, the transmitting transducer and the receiving transducer can be fixedly installed in the cavity structure of the shell, allowing the transmitting and receiving transducers to rotate with the hinge seat as a fulcrum. Furthermore, because the shell has a through hole through which the detection ends of the transmitting and receiving transducers pass, the adsorption head of the detection end can be rotated to contact the building surface. Preferably, the shell has a cable routing hole for wires to pass through. By adopting the above technical solution, the cable routing hole allows wires to pass through, avoiding messy wiring and preventing wires from tangling or interfering with other components during instrument use, thus ensuring the orderliness of the internal circuitry of the instrument and improving the overall stability and reliability of the instrument.

[0005] In summary, this application includes at least one of the following beneficial technical effects:

[0006] 1. Since the transmitting and receiving transducers are distributed symmetrically on both sides of the adjusting rod at a preset standard spacing, their positional relationship is predetermined. There is no need to manually mark measurement points or adjust positions, which avoids the tedious process of manual operation and the problem of difficulty in ensuring accuracy, thereby improving testing efficiency and measurement accuracy.

[0007] 2. Because the detection ends of the transmitting and receiving transducers are equipped with adsorption heads, which can adhere to the building surface, the transmitting and receiving transducers can be prevented from moving during the measurement process, ensuring their fixation and thus improving measurement accuracy. Attached Figure Description

[0008] Figure 1 This is a structural diagram of a crack depth sounder according to Example 1;

[0009] Figure 2 This is a rear view of a crack depth sounder according to Embodiment 1;

[0010] Figure 3 yes Figure 2 AA cross-section view;

[0011] Figure 4 This is a structural diagram of a crack depth sounder according to Example 2;

[0012] Figure 5 This is a rear view of a crack depth sounder according to Embodiment 2;

[0013] Figure 6 This is a top view of the rod unit and telescopic ball structure of a crack depth sounder according to Embodiment 2;

[0014] Figure 7This is the structure of a crack depth sounder in Example 3.

[0015] Explanation of reference numerals in the attached drawings: 1. Main unit; 2. Transmitting transducer; 3. Receiving transducer; 4. Adjusting rod; 5. Adsorption head; 6. Mounting structure; 41. Single rod; 42. Hinge structure; 43. Telescopic structure; 431. Sleeve; 432. Telescopic ball; 4311. Positioning hole; 61. Housing; 62. Hinge seat; 611. Through hole; 612. Cable routing hole. Detailed Implementation

[0016] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0017] Example 1

[0018] This application provides a crack depth sounder, referring to... Figure 1 and Figure 2 The system includes a main unit 1, a transmitting transducer 2, a receiving transducer 3, and an adjusting rod 4. Transmitting transducer 2 and receiving transducer 3 are electrically connected to the main unit 1. This electrical connection allows the transmitting and receiving transducers 2 and 3 to accurately transmit measurement data to the main unit 1 for processing and analysis. Transmitting transducers 2 and 3 are mirror-symmetrically distributed on both sides of the adjusting rod 4, with the central axis as the axis of symmetry, according to a preset standard spacing. This arrangement ensures that the transmitting and receiving transducers 2 and 3 are in relative positions when measuring cracks, facilitating accurate crack depth measurement. Both transmitting and receiving transducers 2 and 3 have adsorption heads 5 at their detection ends, which adhere to the building surface. These adsorption heads 5 ensure stable contact between the transducers and the building surface, preventing movement during measurement and thus improving measurement accuracy.

[0019] Specifically, the main unit 1 is the control and data processing center of the entire crack depth sounder. It employs an integrated circuit design, which combines various functional modules to reduce the size and complexity of the equipment. Its casing protects the internal electronic components from external environmental influences, extending the lifespan of the main unit 1. The main unit 1 contains a processor, display screen, and storage module. The processor is responsible for calculating and analyzing the data transmitted from the transmitting transducer 2 and receiving transducer 3. The display screen provides a clear view of the measurement results for easy operator review, while the storage module stores the measurement data for subsequent analysis and processing.

[0020] Specifically, the transmitting transducer 2 is used to transmit ultrasonic signals, and it is generally made of materials such as piezoelectric ceramics. Piezoelectric ceramics have special physical properties; under the excitation of an electrical signal, they will generate mechanical vibrations, thereby emitting ultrasonic waves. The transmitting transducer 2 is usually cylindrical in shape, which facilitates installation and use.

[0021] Specifically, the receiving transducer 3 is used to receive ultrasonic signals propagating through the building structure. Its working principle is the opposite of that of the transmitting transducer 2. When it receives an ultrasonic signal, it converts it into an electrical signal and transmits it to the host 1. The structure of the receiving transducer 3 is similar to that of the transmitting transducer 2, but it has different requirements in terms of performance indicators such as sensitivity to ensure that it can accurately receive weak ultrasonic signals.

[0022] Specifically, both the transmitting transducer 2 and the receiving transducer 3 have an adsorption head 5 embedded in their detection ends. The adsorption head 5 ensures a tight fit between the transmitting transducer 2 and the receiving transducer 3 and the building surface. It is made of rubber, which has good elasticity and adsorption properties. The adsorption head 5 is shaped like a circular suction cup. This circular suction cup structure allows for better sealing with the building surface, enhancing the adsorption force. An adapter hole 51 is located at the center of the circular suction cup structure. The detection ends of the transmitting transducer 2 and the receiving transducer 3 can pass through the adapter hole 51. Because the outer walls of the detection ends of the transmitting transducer 2 and the receiving transducer 3 have annular grooves, one end of the adapter hole 51 of the suction cup fits onto the outer wall of the detection end. The suction cup fits snugly into the annular groove, forming an interference fit. This interference fit ensures good contact between the detection end and the building surface, enabling accurate transmission and reception of ultrasonic signals. In other embodiments of metal building surface applications, the adsorption head 5 can also be replaced by other structures with adsorption functions, such as a magnetic adsorption device. The magnetic adsorption device can be magnetically adsorbed onto the building surface, which can also achieve the fixation of the transducer.

[0023] Reference Figure 1 and Figure 3 Specifically, both the transmitting transducer 2 and the receiving transducer 3 are rotatably mounted on the adjusting rod 4 via the mounting structure 6. The mounting structure 6 includes a housing 61 and a hinge seat 62. The housing 61 has an internal cavity structure, within which the transmitting transducer 2 and the receiving transducer 3 are fixedly mounted, thus protecting the transducers. The hinge seat 62 is located on the surface of the adjusting rod 4, and the housing 61 is hinged to the hinge seat 62, allowing the housing 61 to rotate around the hinge seat 62. The housing 61 has a through hole 611 through which the detection ends of the transmitting transducer 2 and the receiving transducer 3 protrude to contact the building surface. Through this mounting structure 6, the adsorption heads 5 of the detection ends of the transmitting transducer 2 and the receiving transducer 3 can be rotated to contact the building surface, and applying a certain pressure can ensure that the detection ends are tightly attached to the building surface.

[0024] The housing 61 is provided with a cable routing hole 612 for wires to pass through. The cable routing hole 612 is designed to facilitate the connection of wires between the transmitting transducer 2 and the receiving transducer 3 and the host 1, and can also provide a certain degree of protection for the wires to prevent them from being damaged during use.

[0025] Specifically, in this embodiment, the adjusting rod 4 has a cuboid structure, divided into two rod segments 41, which are hinged together by a hinge structure 42. The hinge structure 42 uses a hinged joint, allowing adjacent rod segments 41 to be folded. Specifically, in this embodiment, there are four transmitting transducers 2 and four receiving transducers 3, arranged at a fixed interval L along the axial direction of the adjusting rod 4. This arrangement allows for simultaneous measurements at multiple locations, greatly improving measurement efficiency. In this embodiment, the fixed interval L is 25mm, and the preset standard distance between the closest pair of transmitting transducers 2 and receiving transducers 3 is 100mm. Thus, with the crack as the axis, i.e., the central axis of the adjusting rod 4, the transducers on both sides are at standard distances of 50mm, 75mm, 100mm, and 125mm from the crack, respectively.

[0026] These components work together: the main unit 1 controls the transmitting transducer 2 to emit ultrasonic signals, and the receiving transducer 3 receives the signals propagating through the building structure and transmits them back to the main unit 1 for processing. The adjusting rod 4 ensures that the transmitting transducer 2 and the receiving transducer 3 are distributed at a preset standard spacing, making the measurement results more accurate. The adsorption head 5 keeps the transducer in stable contact with the building surface, preventing the transducer from moving during the measurement process, thus achieving accurate and efficient crack depth measurement.

[0027] The implementation principle of this embodiment is as follows: The crack depth sounder of this embodiment consists of a host 1, a transmitting transducer 2, a receiving transducer 3, an adjusting rod 4, and an adsorption head 5. The host 1 serves as the control and data processing center, integrating a processor, a display screen, and a storage module to realize data calculation, result display, and storage. The transmitting transducer 2 uses a piezoelectric ceramic cylinder to emit ultrasonic waves, and the receiving transducer 3 converts them into electrical signals and transmits them back to the host 1. The two are mirror-symmetrically distributed with the central axis of the adjusting rod 4 as the axis of symmetry. The four sets of transducers are fixedly spaced at 25mm intervals along the axial direction of the adjusting rod 4. The components are arranged with a first group spacing of 100mm, forming multi-level ranging of 50mm, 75mm, 100mm, and 125mm to improve measurement efficiency. The detection end is equipped with a rubber annular suction cup adsorption head 5, which is embedded in the annular groove of the transducer through interference fit to ensure a tight fit with the building surface. For metal scenes, a magnetic adsorption device can be used instead. The transducer can be flipped and installed on the adjustment rod 4 via the housing 61 and the hinge seat 62. The wiring hole 612 of the housing 61 protects the wire connection. The hinge structure 42 of the adjustment rod 4 enables flexible adjustment. All components work together to achieve efficient and accurate measurement of crack depth.

[0028] Example 2

[0029] The difference between this embodiment and Embodiment 1 is that, referring to... Figure 4 and Figure 5The adjusting rod 4 is divided into two rod segments 41. The two rod segments 41 are connected by a telescopic structure 43 to form a telescopic fit. Specifically, refer to... Figure 6 The telescopic structure 43 includes a sleeve 431 and a telescopic ball 432. The sleeve 431 is slidably connected to two rod segments 41 at both ends. The inner wall of the sleeve 431 has a groove and several positioning holes 4311, spaced axially at fixed intervals L. The telescopic ball 432 is movably mounted on the outer wall of each rod segment 41, and can slide along the groove. When the telescopic ball 432 slides out of any positioning hole 4311, the relative position of the two rod segments 41 is fixed, thus adjusting the length of the adjusting rod 4. The telescopic ball 432 is generally made of metal with a smooth surface, allowing it to slide smoothly within the groove. The bottom of the telescopic ball 432 is mounted to the adjusting rod 4 via an elastic reset structure. Pressing the telescopic ball 432 retracts it into the positioning hole 4311, allowing it to move along the groove. When the telescopic ball 432 slides to the positioning hole 4311, the elastic reset structure pushes the telescopic ball 432 out of the positioning hole 4311. There are four positioning holes 4311.

[0030] This embodiment requires only one set of transmitting transducers 2 and receiving transducers 3. The transmitting transducers 2 and receiving transducers 3 are mirror-symmetrically distributed on both sides of the adjusting rod 4 with the central axis of the adjusting rod 4 as the axis of symmetry, according to a preset standard spacing. The preset standard spacing in this embodiment is the test spacing between the transmitting transducers 2 and receiving transducers 3 when they are fully retracted into the sleeve 431. The fixed spacing L is 25mm. That is to say, every time the transmitting transducers 2 and receiving transducers 3 extend, the distance from the central axis of the sleeve 431 increases by 25mm. Finally, with the crack as the axis, that is, the central axis of the adjusting rod 4 as the axis, the distances of the transducers on both sides from the crack are 50mm, 75mm, 100mm, and 125mm respectively. The positions of the four positioning holes 4311 correspond to the standard distances of 50mm, 75mm, 100mm, and 125mm respectively.

[0031] The implementation principle of this embodiment is as follows: The adjusting rod 4 of the crack depth sounder in this embodiment adopts a two-section rod unit 41 and a telescopic structure 43. The telescopic structure 43 is slidably connected to the two-section rod unit 41 through a sleeve 431. The sleeve 431 is provided with four positioning holes 4311 and a sliding groove with an axial spacing of 25mm. The metal telescopic ball 432 on the rod unit 41 is installed through an elastic reset structure. Pressing the telescopic ball 432 can make it retract into the sliding groove and slide along the sleeve 431. After release, the telescopic ball 432 pops out and is locked into the positioning hole 4311 to achieve length fixation. The transmitting and receiving transducers 3 are mirror-distributed with the central axis of the adjusting rod 4 as the axis of symmetry. Their initial test spacing is the preset value when fully retracted into the sleeve 431. Each time it extends outward through the positioning hole 4311, the distance of the transducer from the central axis increases by 25mm. The four positioning holes 4311 correspond to the standard measurement distances of 50mm, 75mm, 100mm and 125mm on both sides of the crack, respectively, thereby realizing flexible adjustment of the length of the adjusting rod 4 and multi-level precise positioning of the transducer.

[0032] Example 3

[0033] The difference between this embodiment and Embodiment 1 is that: (Refer to...) Figure 7 The adjusting rod 4 is a simple cuboid structure of fixed length. There are four transmitting transducers 2 and four receiving transducers 3, arranged at fixed intervals L along the axial direction of the adjusting rod 4. The fixed interval L is 25mm. The distance between the transmitting transducer 2 and the receiving transducer 3 closest to the central axis of the adjusting rod 4 is 100mm. That is, with the central axis of the fixed-length adjusting rod 4 as the axis, the distances of the transducers on both sides from the crack are, respectively, 50mm, 75mm, 100mm, and 125mm (standard measurement distances). The fixed-length adjusting rod 4 has a simple and stable structure.

[0034] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A crack depth sounder, characterized in that, The device includes a host (1), a transmitting transducer (2), a receiving transducer (3), and an adjusting rod (4). The transmitting transducer (2) and the receiving transducer (3) are electrically connected to the host (1). The transmitting transducer (2) and the receiving transducer (3) are symmetrically distributed on both sides of the adjusting rod (4) with the central axis of the adjusting rod (4) as the axis of symmetry and according to a preset standard spacing. The detection ends of the transmitting transducer (2) and the receiving transducer (3) are equipped with adsorption heads (5) that are adsorbed onto the building surface.

2. The crack depth sounder according to claim 1, characterized in that, The adjusting rod (4) is divided into two or more rod units (41), and adjacent rod units (41) are hinged together by a hinge structure (42).

3. The crack depth sounder according to claim 1, characterized in that, The adjusting rod (4) is divided into two rod units (41), and the two rod units (41) slide against each other through the telescopic structure (43).

4. A crack depth sounder according to claim 3, characterized in that, The telescopic structure (43) includes a sleeve (431) and a telescopic ball (432). The two ends of the sleeve (431) are slidably connected to the two rod segments (41) respectively. The inner wall of the sleeve (431) is provided with a groove and a number of positioning holes (4311). The positioning holes (4311) are arranged axially at fixed intervals L. The outer walls of the rod segments (41) at both ends are movably provided with telescopic balls (432). The telescopic balls (432) slide along the groove to extend out of any one of the positioning holes (4311).

5. A crack depth sounder according to claim 2, characterized in that, There are four transmitting transducers (2) and four receiving transducers (3), and the four transmitting transducers (2) and the four receiving transducers (3) are arranged at a fixed interval L along the axial direction of the adjusting rod (4).

6. A crack depth sounder according to claim 1, characterized in that, The adsorption head (5) is a circular suction cup structure. An adapter hole (51) is provided in the center of the circular suction cup structure. The detection ends of the transmitting transducer (2) and the receiving transducer (3) can pass through the adapter hole (51) and be interference-fitted with the suction cup.

7. A crack depth sounder according to claim 1, characterized in that, The transmitting transducer (2) and the receiving transducer (3) are both rotatably mounted on the adjusting rod (4) via the mounting structure (6), and the adsorption heads (5) at the detection ends of the transmitting transducer (2) and the receiving transducer (3) can be rotatably rotated to contact the building surface.

8. A crack depth sounder according to claim 7, characterized in that, The mounting structure (6) includes a housing (61) and a hinge seat (62). The housing (61) has a cavity structure inside. The hinge seat (62) is disposed on the surface of the adjusting rod (4). The housing (61) is hinged to the hinge seat (62). The transmitting transducer (2) and the receiving transducer (3) are fixedly disposed in the cavity structure of the housing (61). The housing (61) has a through hole (611). The detection ends of the transmitting transducer (2) and the receiving transducer (3) pass through the through hole (611).

9. A crack depth sounder according to claim 8, characterized in that, The housing (61) is provided with a cable hole (612) for wires to pass through.

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