Rock wave speed non-destructive testing device and method based on dry coupling point contact

Abstract

This invention discloses a non-destructive testing device for rock wave velocity based on dry coupling point contact, comprising: a mounting frame; a placement mechanism disposed in the middle of the mounting frame, the placement mechanism forming a placement cavity; a detection mechanism including a first detection component and a second detection component, the first detection component and the second clamping component being respectively disposed on both sides of the mounting frame relative to the clamping cavity, the first detection component including a first ultrasonic probe, the second detection component including a second ultrasonic probe, the first ultrasonic probe and the second ultrasonic probe being movable in a direction of approaching or moving away from each other; and a ranging mechanism for detecting the distance between the first ultrasonic probe and the second ultrasonic probe. Compared with the prior art, this application can reduce the cross-sectional area of ​​the ultrasonic probe, thereby reducing the contact surface between it and the rock block, and thus allowing the ultrasonic probe to press firmly against the rock block, thereby reducing the distance between it and the rock block, and eliminating the dependence on liquid coupling agent.

Description

Technical Field

[0001] This invention relates to the field of rock physical and mechanical parameter testing technology, and in particular to a non-destructive testing device and method for rock wave velocity based on dry coupling point contact. Background Technology

[0002] Currently, using the ultrasonic pulse method to test the wave velocity of rocks is a core technology for obtaining their dynamic elastic modulus and assessing the integrity of rock masses. Traditional standard methods require processing rock samples into standard cylinders and applying coupling agents such as petroleum jelly or silicone oil between the probe and the rock sample.

[0003] Traditional methods have inherent drawbacks, such as the use of coupling agents contaminating samples and being cumbersome to operate, and they are not effective or even unusable on porous, highly absorbent, or high / low temperature rocks.

[0004] Therefore, there is an urgent need for a detection device that can directly test the wave velocity of rock blocks. Summary of the Invention

[0005] The present invention aims to solve the technical problems existing in the above-mentioned related technologies, and proposes a non-destructive testing device and method for rock block wave velocity based on dry coupling point contact, which can realize the automated wave velocity testing of rock blocks directly.

[0006] The solution to the technical problem of this invention is: In a first aspect, this application provides a non-destructive testing device for rock block wave velocity based on dry coupling point contact, comprising: Mounting rack; A placement mechanism is disposed in the middle of the mounting frame, and the placement mechanism forms a placement cavity; The testing mechanism includes a first testing component and a second testing component. The first testing component and the second clamping component are respectively disposed on both sides of the mounting frame relative to the clamping cavity. The first testing component includes a first ultrasonic probe, and the second testing component includes a second ultrasonic probe. The cross-sectional diameters of the first ultrasonic probe and the second ultrasonic probe are between 3 and 10 mm. The first ultrasonic probe and the second ultrasonic probe can move along the same straight line in a direction that approaches or moves away from each other. A ranging mechanism for detecting the distance between the first ultrasonic probe and the second ultrasonic probe.

[0007] This technical solution has at least the following beneficial effects: First, the rock block to be tested is placed into the placement cavity manually or with a robotic arm. Then, the first and second ultrasonic probes are activated and brought close together until they are firmly pressed against the rock block. This stabilizes the rock block within the placement cavity under the action of the first and second ultrasonic probes. Subsequently, a ranging mechanism measures the distance between the first and second ultrasonic probes, which is the propagation distance of the ultrasonic wave on the rock block. The initial arrival point of the longitudinal wave is automatically located in the initial segment of the waveform using the AIC (Akaike Information Criterion) method, and the propagation time Tp is calculated. Next, polarization analysis or wavelet transform is performed on the waveform to identify the transverse wave component perpendicular to the polarization direction of the longitudinal wave. The initial arrival point of the transverse wave is accurately determined using cross-correlation or thresholding methods, and the propagation time Ts is calculated. This facilitates the subsequent determination of rock block parameters based on the longitudinal and transverse waves of the ultrasonic waves.

[0008] This design reduces the cross-sectional area of ​​the ultrasonic probe, decreasing the contact area between it and the rock. This allows the ultrasonic probe to press firmly against the rock, reducing the distance between them and lowering the requirements for the flatness and parallelism of the rock surface. It also eliminates the dependence on liquid coupling agents.

[0009] As a further improvement to the above technical solution, the first detection component includes a drive frame and a drive screw. The drive frame is slidably mounted on the mounting frame, the first ultrasonic probe is mounted on the drive frame, and the drive screw is rotatably mounted on the mounting frame and threadedly connected to the drive frame.

[0010] As a further improvement to the above technical solution, a disc spring assembly is provided on the drive frame, with one end of the disc spring assembly connected to the first ultrasonic probe and the other end connected to the drive frame.

[0011] As a further improvement to the above technical solution, the first detection component further includes a drive motor, which is mounted on the mounting bracket, and the output end of the drive motor is connected to the drive screw and can drive the drive screw to rotate.

[0012] As a further improvement to the above technical solution, the detection mechanism also includes a cleaning component, which includes a striking element. A plurality of the striking elements are arranged circumferentially on the drive frame along the straight line where the first ultrasonic probe outputs. The striking element has a striking end, which can reciprocate along the straight line where the first ultrasonic probe outputs.

[0013] As a further improvement to the above technical solution, the cleaning component also includes a blower, which is mounted on the drive frame.

[0014] As a further improvement to the above technical solution, the straight line where the output end of the blower is located intersects with the straight lines where the first ultrasonic probe and the second ultrasonic probe are located.

[0015] Secondly, this application also provides a non-destructive testing method for rock wave velocity based on dry coupling point contact, which is applied to the non-destructive testing device for rock wave velocity based on dry coupling point contact described in the first aspect, and includes: Place the rock block to be tested into the placement cavity; The first detection component is activated, causing it to move closer to the second detection component until the first ultrasonic probe comes into contact with the rock. The ultrasonic propagation path between the first and second ultrasonic probes is then measured using a ranging mechanism. Start the first and second ultrasonic probes; The arrival times of the transverse and longitudinal waves of the ultrasound were obtained. The wave velocity of the transverse wave and the wave velocity of the longitudinal wave of the ultrasonic wave are obtained.

[0016] Compared with the prior art, the present invention has the following significant advantages: (1) Truly non-destructive and widely applicable: No need to cut or grind rock samples, no need for coupling agent, perfectly preserves the original state of the rock, especially suitable for fragile, precious, irregular and field rock blocks.

[0017] (2) High precision and high reliability: accurate distance measurement eliminates path error; automatic waveform interpretation eliminates human reading time error; the results have good repeatability and the accuracy is comparable to standard test.

[0018] (3) High degree of automation and intelligence: From sample loading, clamping, distance measurement, excitation, collection, analysis, calculation to report generation, the whole process is automated, which greatly reduces the dependence on the professional technical experience of operators. Ordinary workers can operate it after a short training.

[0019] (4) Objective and traceable data: The original data is automatically uploaded and cannot be tampered with, which ensures the impartiality and scientific nature of the test results and provides authoritative data support for engineering quality acceptance and geological survey reports.

[0020] (5) Portable and efficient: The device is lightweight and modular, making it easy to carry to the field site and realize rapid screening and evaluation of rock mass quality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the rock block wave velocity non-destructive testing device based on dry coupling point contact according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the overall structure of the rock block wave velocity non-destructive testing device based on dry coupling point contact according to Embodiment 2 of the present invention.

[0023] Attached icon number 1. Mounting bracket; 2. Placement mechanism; 21. Placement cavity; 3. First detection component; 31. First ultrasonic probe; 4. Second detection component; 41. Second ultrasonic probe; 5. Drive frame; 6. Drive screw; 7. Disc spring assembly; 8. Cleaning component; 81. Impacting component; 82. Blowing component; 83. Dust removal frame; 84. Dust removal drive motor; 85. Transmission gear set. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0026] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0028] Traditional rock performance testing equipment typically uses the ultrasonic pulse method. Specifically, it measures the wave velocity of the ultrasonic wave after passing through the rock block to determine the dynamic elastic modulus of the rock block. In this process, the rock block is first processed into a cylinder, and a coupling agent is applied to it. Then, the ultrasonic probe is placed against the coupling agent, allowing the ultrasonic wave to propagate stably within the rock block through the coupling agent. However, for rock samples that are easily weathered and broken or small in size, sample preparation is difficult, and the sample preparation process itself disturbs the original physical state of the rock. Furthermore, the coupling agent is not effective for some porous, highly absorbent, or high / low temperature rock samples. Therefore, there is a need for a device that can perform rapid, non-destructive, coupling-free, and automated wave velocity testing on irregular rock blocks in a dry state.

[0029] Therefore, this application provides a non-destructive testing device and method for rock block wave velocity based on dry coupling point contact.

[0030] Example 1: This application provides a non-destructive testing device for rock block wave velocity based on dry coupling point contact, referring to... Figure 1 It includes a mounting frame 1, a placement mechanism 2, a detection mechanism, and a ranging mechanism. The mounting frame 1 serves as the supporting base of the device. The placement mechanism 2 is a placement groove with a placement cavity 21 formed in the middle of the placement groove. The detection mechanism includes a first detection component 3 and a second detection component 4. The first detection component 3 includes a first ultrasonic probe 31, and the second detection component 4 includes a second ultrasonic probe 41. The cross-sectional diameters of the first ultrasonic probe 31 and the second ultrasonic probe 41 are between 3 and 10 mm. The first ultrasonic probe 31 and the second ultrasonic probe 41 can move along the same straight line in a direction that approaches or moves away from each other. The ranging mechanism is used to detect the distance between the first ultrasonic probe 31 and the second ultrasonic probe 41.

[0031] During rock block testing, the rock block to be tested is first placed into the placement cavity 21 manually or with a robotic arm. Then, the first ultrasonic probe 31 and the second ultrasonic probe 41 are activated and brought close together until both probes are firmly against the rock block. This stabilizes the rock block within the placement cavity 21 under the combined action of the probes. The ranging mechanism then measures the distance L between the probes, which is the propagation distance of the ultrasonic wave on the rock block. The initial point of the longitudinal wave is automatically located in the initial segment of the waveform using the AIC (Akaike Information Criterion) method, and the propagation time Tp is calculated. Next, polarization analysis or wavelet transform is performed on the waveform to identify the transverse wave component perpendicular to the longitudinal wave polarization direction. The first arrival point of the transverse wave is accurately determined using cross-correlation or thresholding methods, and the propagation time Ts is calculated. The values ​​Vp = L / Tp and Vs = L / Ts are automatically calculated. Furthermore, parameters such as the dynamic elastic modulus Ed and dynamic Poisson's ratio μd can be calculated using elastic dynamics formulas. Preferably, the placement cavity 21 has a V-shaped structure that is wider at the top and narrower at the bottom. The V-shaped groove design of the placement cavity 21 enables the rock to automatically center and stabilize in the groove when placed, which greatly simplifies the sample loading process and provides a preliminary benchmark for the alignment of the detection structure.

[0032] Preferably, the first ultrasonic probe 31 and the second ultrasonic probe 41 are respectively small-diameter transmitting and receiving piezoelectric ceramic probes to achieve near-point contact. Through this design, the cross-sectional area of ​​the ultrasonic probe is reduced, thereby reducing the contact area between it and the rock block. This allows the ultrasonic probe to press against the rock block, thereby reducing the distance between it and the rock block, reducing the requirements for the flatness and parallelism of the rock surface, and eliminating the dependence on liquid coupling agent.

[0033] The first ultrasonic probe 31 also includes a transmitting circuit, and the second ultrasonic probe 41 also includes a receiving, amplifying, and filtering circuit. The transmitting circuit is used to generate a high-voltage pulse to excite the probe, and the receiving, amplifying, and filtering circuit can preprocess the received weak ultrasonic signal.

[0034] Preferably, the mounting bracket 1 adopts a lightweight design and is made of aluminum alloy or engineering plastic to reduce the overall weight of the equipment and make it easy to carry.

[0035] Preferably, the ranging mechanism uses a high-precision digital displacement sensor, such as an optical grating ruler or a magnetic grating ruler, which can accurately measure the distance between two ultrasonic probes, thereby accurately measuring the surface of irregular rock blocks.

[0036] Specifically, a magnetic scale is installed on the main body of the mounting bracket 1, a magnetic reading head is installed on one of the ultrasonic probes, and the other ultrasonic probe is set as a fixed reference point. When reading, the position of the magnetic reading head relative to the fixed reference point is read in real time, and the distance L between the first ultrasonic probe 31 and the second ultrasonic probe 41 can be obtained.

[0037] In some embodiments, the first detection component 3 further includes a drive frame 5 and a drive screw 6. The drive frame 5 is slidably mounted on the mounting frame 1, and the drive screw 6 is rotatably mounted on the mounting frame 1. The drive screw 6 is threadedly connected to the drive frame 5. A high-precision linear slide rail or guide post can be installed on the mounting frame 1 to guide the drive frame 5, thereby enabling the drive frame 5 to slide stably along a predetermined path and apply a controllable and constant clamping force to the rock block.

[0038] Furthermore, a knob is connected to one end of the drive screw 6 that protrudes from the mounting bracket 1, so that the user can turn the knob to drive the drive screw 6 to rotate, thereby driving the drive bracket 5 to slide on the mounting bracket 1.

[0039] In other embodiments, in order to further improve the automation level of the device and reduce the error of manual operation, the first detection component 3 also includes a drive motor. The drive motor is fixedly installed on the mounting frame 1, and the output end of the drive motor is connected to the drive screw 6. Through the precise rotation of the drive screw 6 by the drive motor, the drive frame 5 can be moved until the first ultrasonic probe 31 is pressed against the rock.

[0040] Furthermore, a force sensor can be integrated into the first ultrasonic probe 31. The force sensor is used to sense the change in force on the surface of the first ultrasonic probe 31. When the force sensor changes, that is, when the first ultrasonic probe 31 is pressed against the rock, the drive motor immediately stops moving, causing the drive frame 5 to stop moving, thus preventing the first ultrasonic probe 31 from being damaged by collision.

[0041] A disc spring assembly is provided between the first ultrasonic probe 31 and the thrust surface of the drive screw 6. One end of the disc spring assembly 7 is connected to the first ultrasonic probe 31 and the other end is connected to the drive frame 5. When the screw is rotated to make the drive frame 5 continue to rotate, the spring is compressed and generates elastic force. The introduction of the spring avoids the rock crushing or probe damage that may be caused by rigid drive, and can keep the pressure evenly distributed when the rock surface is slightly uneven.

[0042] The rock wave velocity non-destructive testing device based on dry coupling point contact also includes a control unit, which can be integrated into the device housing or connected to a portable industrial computer or tablet via cable. It includes: Main controller: such as ARM or FPGA chip, which coordinates the operation of the entire system.

[0043] Ultrasonic pulse transmitter / receiver card: generates a high-voltage narrow pulse to excite the transmitting probe and acquires the voltage signal transmitted from the receiving probe at a high rate (e.g., 100MS / s).

[0044] Stepper motor driver: controls the rotation of the drive motor to start the drive screw 6.

[0045] Intelligent analysis software: Built-in automatic wave velocity determination algorithm.

[0046] The control unit operates as follows: The test is started after the user places a rock.

[0047] The controller drives the probe modules to move towards each other until they contact the rock and reach the preset clamping force, while reading and locking the current path length L from the digital displacement measurement system.

[0048] Trigger ultrasonic wave emission and simultaneously acquire and store complete waveform signals containing longitudinal waves (P-waves) and transverse waves (S-waves).

[0049] Automatic interpretation: The software processes the waveform. First, it automatically locates the initial point of the P-wave in the initial segment of the waveform using the AIC (Akaike Information Criterion) picking method and calculates the propagation time Tp. Next, it performs polarization analysis or wavelet transform on the waveform to identify the S-wave component perpendicular to the polarization direction of the P-wave, and accurately determines the initial point of the S-wave using cross-correlation or thresholding methods, calculating the propagation time Ts. The entire process requires no manual intervention.

[0050] Calculation and Output: Automatically calculates Vp=L / Tp and Vs=L / Ts. It can further calculate parameters such as the dynamic elastic modulus Ed and dynamic Poisson's ratio μd based on elastic dynamics formulas. Data Upload: The system automatically uploads the raw waveform, length L, time Tp / Ts, calculation results, test time, and location information to the cloud database via a built-in Wi-Fi / 4G module, which includes encryption. The cloud server automatically generates a PDF test report, which users can view or download via their terminals.

[0051] In some embodiments, the first detection component 3 and the second detection component 4 have the same structure and are symmetrically arranged with respect to the placement mechanism 2, so that the ultrasonic probes on the first detection component 3 and the second detection component 4 can stably abut against the rock.

[0052] Example 2 A non-destructive testing method for rock wave velocity based on dry coupling point contact is applied to a rock wave velocity non-destructive testing device based on dry coupling point contact in the first aspect, which includes: Place the rock block to be tested into the placement cavity 21; The first detection component 3 is activated, causing it to move closer to the second detection component 4 until the first ultrasonic probe 31 comes into contact with the rock. The ultrasonic propagation path between the first ultrasonic probe 31 and the second ultrasonic probe 41 is measured using a ranging mechanism. Start the first ultrasonic probe 31 and the second ultrasonic probe 41; The arrival times of the transverse and longitudinal waves of the ultrasound were obtained. The wave velocity of the transverse wave and the wave velocity of the longitudinal wave of the ultrasonic wave are obtained.

[0053] The implementation principle of this invention's non-destructive testing method for rock wave velocity based on dry coupling point contact is as follows: The operator places an irregular rock block into a V-shaped groove and manually or automatically drives the right probe module to move. Under the constant pressure provided by the spring, the left and right point contact probes are in close contact with both sides of the rock. A digital displacement sensor accurately measures the propagation path length L in real time. An integrated unit controls ultrasonic excitation and acquisition, and uses an intelligent algorithm to automatically determine the propagation time of the P-wave and S-wave from the waveform, thereby calculating the wave velocity. All data is automatically uploaded to ensure the objectivity and traceability of the results.

[0054] Example 3 Because the collected rocks may contain dirt and dust, in order to remove the dirt and dust from the rocks, in this embodiment, the detection mechanism also includes a cleaning component 8. The first detection component 3 and the second detection component 4 are both equipped with the cleaning component 8. The cleaning component 8 includes a striking element 81. Multiple striking elements 81 are arranged circumferentially on the drive frame 5 along the straight line where the output direction of the first ultrasonic probe 31 is located. The striking element 81 has a striking end, which can reciprocate along the straight line where the output direction of the first ultrasonic probe 31 is located. By striking the rocks with the striking end, dirt and other materials are shaken off the rocks, reducing the medium between the ultrasonic probe on the first detection component 3 and the rocks, so that the ultrasonic waves are not affected by other substances when passing through the rocks.

[0055] Furthermore, the striking component 81 includes a vibratory hammer, and a dust removal frame 83 is mounted on the drive frame 5. The dust removal frame 83 is rotatably sleeved on the drive frame 5, so that the vibratory hammer can strike the rock block circumferentially. Multiple vibratory hammers are arranged on the dust removal frame 83 along the circumference of the drive frame 5. The drive frame 5 is provided with a drive assembly for driving the dust removal frame 83 to rotate. In this embodiment, the dust removal drive component includes a dust removal drive motor 84 and a transmission gear set 85. The dust removal drive motor 84 drives the dust removal frame 83 to rotate on the drive frame 5 through the transmission gear set 85, so that multiple vibratory hammers can continuously strike the rock block around the detection point without damaging the position in contact with the first ultrasonic wave.

[0056] The cleaning component 8 also includes a blower 82, which is mounted on the drive frame 5. After the dirt and other materials are shaken apart, the dirt and dust are blown away by the blower 82. Specifically, the blower 82 can be an air duct, which is mounted on the drive frame 5.

[0057] The straight line where the output end of the blower 82 is located intersects with the straight line where the first ultrasonic probe 31 and the second ultrasonic probe 41 are located. By adopting the above technical solution, after being struck, the soil on the rock is loosened and the tightness of the bond between the soil and the rock decreases. At this time, the drive frame 5 is moved to make the blower 82 and the first ultrasonic probe 31 move synchronously until the straight line where the output end of the first ultrasonic probe 31 is located and the straight line where the blower 82 is located intersect on the rock. Under these circumstances, the interaction between the sound field and the flow field is enhanced. The ultrasonic waves and the high-speed airflow work together to remove the dust particles on the surface of the rock.

[0058] Furthermore, a cleaning component 8 is also provided at the second detection component 4 to clean the area where the second detection component 4 contacts the rock block.

[0059] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A non-destructive testing device for rock block wave velocity based on dry coupling point contact, characterized in that, include: Mounting bracket (1); A placement mechanism (2) is disposed in the middle of the mounting frame (1), and the placement mechanism (2) has a placement cavity (21); The testing mechanism includes a first testing component (3) and a second testing component (4). The first testing component (3) and the second clamping component are respectively disposed on both sides of the mounting frame (1) relative to the clamping cavity. The first testing component (3) includes a first ultrasonic probe (31), and the second testing component (4) includes a second ultrasonic probe (41). The cross-sectional diameters of the first ultrasonic probe (31) and the second ultrasonic probe (41) are between 3 and 10 mm. The first ultrasonic probe (31) and the second ultrasonic probe (41) can move along the same straight line in a direction that approaches or moves away from each other. A ranging mechanism for detecting the distance between the first ultrasonic probe (31) and the second ultrasonic probe (41).

2. The rock block wave velocity non-destructive testing device based on dry coupling point contact according to claim 1, characterized in that, The first detection component (3) includes a drive frame (5) and a drive screw (6). The drive frame (5) is slidably mounted on the mounting frame (1). The first ultrasonic probe (31) is mounted on the drive frame (5). The drive screw (6) is rotatably mounted on the mounting frame (1). The drive screw (6) is threadedly connected to the drive frame (5).

3. The rock block wave velocity non-destructive testing device based on dry coupling point contact according to claim 2, characterized in that, The drive frame (5) is provided with a disc spring assembly (7), one end of which is connected to the first ultrasonic probe (31) and the other end is connected to the drive frame (5).

4. The rock block wave velocity non-destructive testing device based on dry coupling point contact according to claim 2, characterized in that, The first detection component (3) also includes a drive motor, which is mounted on the mounting bracket (1). The output end of the drive motor is connected to the drive screw (6) and can drive the drive screw (6) to rotate.

5. The rock block wave velocity non-destructive testing device based on dry coupling point contact according to claim 2, characterized in that, The detection mechanism also includes a cleaning component (8), which includes a striking element (81). Multiple striking elements (81) are arranged circumferentially on the drive frame (5) along the straight line where the output direction of the first ultrasonic probe (31) is located. The striking element (81) has a striking end, which can reciprocate along the straight line where the output direction of the first ultrasonic probe (31) is located.

6. The rock block wave velocity non-destructive testing device based on dry coupling point contact according to claim 5, characterized in that, The cleaning component (8) also includes a blower (82) mounted on the drive frame (5).

7. The rock block wave velocity non-destructive testing device based on dry coupling point contact according to claim 6, characterized in that, The straight line at the output end of the blower (82) intersects with the straight lines at the first ultrasonic probe (31) and the second ultrasonic probe (41).

8. A non-destructive testing method for rock block wave velocity based on dry coupling point contact, characterized in that, It is applied to a rock block wave velocity nondestructive testing device based on dry coupling point contact as described in any one of claims 1-4, comprising: The rock block to be tested is placed into the placement cavity (21); Activate the first detection component (3) so that the first detection component (3) moves toward the direction of the second detection component (4) until the first ultrasonic probe (31) comes into contact with the rock block. Use the ranging mechanism to measure the ultrasonic propagation path between the first ultrasonic probe (31) and the second ultrasonic probe (41) at this time. Start the first ultrasonic probe (31) and the second ultrasonic probe (41); The arrival times of the transverse and longitudinal waves of the ultrasound were obtained. The wave velocity of the transverse wave and the wave velocity of the longitudinal wave of the ultrasonic wave are obtained.

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