Ultrasonic detection device capable of controlling coupling strength

Abstract

The utility model provides an ultrasonic testing device capable of controlling coupling strength, which belongs to the technical field of nondestructive testing and comprises a motor, an upper sliding plate, a compression stress detection mechanism, an ultrasonic sensor, a lead screw and a controller, the output end of the motor is connected with one end of the lead screw, and one end of the lead screw penetrates through the front end of the upper sliding plate and drives the upper sliding plate to move back and forth. The compression stress detection mechanism is arranged at the front end of the upper sliding plate and moves back and forth along with the upper sliding plate, the ultrasonic sensor is arranged at the front end of the compression stress detection mechanism, and the controller is connected with the compression stress detection mechanism, the ultrasonic sensor and the motor. The technical problems that due to the fact that the discreteness of coupling pressure applied by existing manual coupling is large, the qualification rate of single-time detection is insufficient, the detection requirement can be met only by repeating 3-5 times of coupling, and the detection efficiency is seriously restricted are solved, the detection precision is higher, and the cost is lower.

Description

Technical Field

[0001] This utility model relates to the field of nondestructive testing technology, and in particular to an ultrasonic testing device with controllable coupling force. Background Technology

[0002] Ultrasonic testing, as one of the core technologies in the field of non-destructive testing, is widely used in aerospace, energy pipelines, rail transportation, and building structural health monitoring. Its non-invasive and high-sensitivity characteristics make it the preferred solution for detecting internal structural defects such as cracks and voids. However, the signal quality of ultrasonic testing is closely related to the stability of the coupling interface pressure. When the coupling pressure between the probe and the object being tested fluctuates excessively, it significantly affects the acoustic transmittance, leading to a decrease in defect detection rate.

[0003] In existing technologies, manual coupling, which relies on the operator's experience to apply pressure, has systemic drawbacks: the coupling pressure applied by the operator is highly variable, resulting in insufficient pass rates for single tests. Typically, 3-5 repeated couplings are required to meet the testing requirements, severely limiting testing efficiency. Furthermore, current high-precision pressure control equipment is prohibitively expensive, hindering large-scale deployment. Utility Model Content

[0004] The purpose of this invention is to provide an ultrasonic testing device with controllable coupling force, which solves the technical problem that the coupling pressure applied by existing manual coupling has large dispersion, resulting in insufficient single-test pass rate, and usually requires 3-5 repeated couplings to meet the testing requirements, which seriously restricts the testing efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An ultrasonic testing device with controllable coupling force includes a telescopic motion device, an upper slide plate, a compression force detection mechanism, an ultrasonic sensor, and a controller. The telescopic motion device is connected to the upper slide plate and drives the upper slide plate to move back and forth. The compression force detection mechanism is located at the front end of the upper slide plate and moves back and forth with the upper slide plate. The ultrasonic sensor is located at the front end of the compression force detection mechanism. The controller is connected to the compression force detection mechanism, the ultrasonic sensor, and the upper slide plate.

[0007] Furthermore, the above solution also includes a fixing plate, with the motor fixedly mounted at one end of the fixing plate, and the lead screw passing through the fixing plate.

[0008] Furthermore, the compression force detection mechanism includes a spring column and a three-grip chuck. The three-grip chuck is located at the front end of the spring column, and the rear end of the spring column is fixedly connected to the upper slide plate.

[0009] Furthermore, the spring column includes a housing, a pressure sensor, and a spring. The pressure sensor is located inside the housing, one end of the spring is mounted on the pressure sensor, and the other end of the spring is connected to the chuck base of the three-jaw chuck. The chuck base is locked inside the housing, and the three-jaw chuck moves with the extension and retraction of the spring.

[0010] Furthermore, the above solution also includes a sliding support, which is slidably mounted at the bottom end of the fixed plate.

[0011] Furthermore, the sliding support is configured as an L-shaped structure, with a circular hole at the front end of the L-shaped structure. The ultrasonic sensor is positioned directly opposite the circular hole and can pass through it.

[0012] Furthermore, the telescopic motion device includes a motor and a lead screw. The output end of the motor is connected to one end of the lead screw, and the upper slide plate is connected to the sliding sleeve of the lead screw. The upper slide plate moves back and forth with the sliding sleeve of the lead screw. The sliding sleeve and lead screw can be purchased and installed directly, or a cylinder can be purchased as a substitute.

[0013] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0014] This invention allows for precise force control within a specific range, flexibly adjusting the coupling force according to material properties to achieve excellent acoustic coupling, avoid coupling layer interference, and significantly improve detection accuracy and signal quality. It offers significant cost advantages, with substantial reductions in hardware costs. Precise force control reduces probe wear, lowering maintenance and replacement costs. It is highly adaptable, with a modular design compatible with mainstream probes. Dual adsorption modes adapt to complex working conditions, and adjustable coupling force accommodates different materials and complex environments, broadening the detection range. In terms of efficiency and stability, closed-loop control eliminates manual variation, significantly improving detection efficiency and quickly reaching optimal performance. It reduces preparation work, facilitates integration into automated detection processes, and improves production line efficiency and quality. Regarding ease of operation, the folding design of the sliding support and flexible fixing methods such as magnetic and vacuum adsorption make installation and storage more convenient compared to traditional fixing methods. From a system stability perspective, the built-in helical spring in the spring guide post increases flexibility, avoiding the risk of damage from rigid contact and improving overall stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the ultrasonic testing device of this utility model;

[0016] Figure 2 This is a schematic diagram of the lead screw structure of this utility model;

[0017] Figure 3 This is a structural diagram of the three-grip chuck and spring column of this utility model;

[0018] Figure 4 This is a diagram of the internal structure of the spring column of this utility model;

[0019] Figure 5 This is a structural diagram of the sliding support of this utility model;

[0020] Figure 6 This is a flowchart of the testing process of this utility model.

[0021] In the attached diagram, 1-motor, 2-upper slide plate, 3-spring column, 4-sliding support, 5-three-grip chuck, 6-ultrasonic sensor, 7-round hole, 8-lead screw, 9-pressure sensor, 10-spring, 11-chuck base. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of this utility model, and these aspects can be achieved even without these specific details.

[0023] like Figure 1-6 As shown, an ultrasonic testing device with controllable coupling force includes a telescopic motion device, an upper sliding plate 2, a compression force detection mechanism, an ultrasonic sensor 6, and a controller. The telescopic motion device is connected to the upper sliding plate 2 and drives the upper sliding plate 2 to move back and forth. The compression force detection mechanism is located at the front end of the upper sliding plate 2 and moves back and forth with the upper sliding plate 2. The ultrasonic sensor 6 is located at the front end of the compression force detection mechanism. The controller is connected to the compression force detection mechanism, the ultrasonic sensor 6, and the upper sliding plate 2. The upper sliding plate 2 moving forward drives the ultrasonic sensor 6 forward. If it rotates in the opposite direction, it drives the upper sliding plate 2 to move back, thus achieving back-and-forth movement. The upper sliding plate 2 is designed with an L-shaped structure. The telescopic motion device includes a motor 1 and a lead screw 8. The output end of the motor 1 is connected to one end of the lead screw 8, and the upper sliding plate 2 is connected to the sliding sleeve of the lead screw 8. The upper sliding plate 2 moves back and forth with the sliding sleeve of the lead screw 8. Alternatively, a cylinder or an existing electric push rod can be used instead of the telescopic motion device. The telescopic motion device is selected based on actual use and price requirements.

[0024] In this embodiment of the invention, a fixing plate is also included, with the motor 1 fixedly mounted at one end of the fixing plate, and the lead screw 8 passing through the fixing plate. The fixing plate is configured as a rectangular structure.

[0025] In this embodiment of the invention, the compression force detection mechanism includes a spring column 3 and a three-grip clamp 5. The three-grip clamp 5 is disposed at the front end of the spring column 3, and the rear end of the spring column 3 is fixedly connected to the upper sliding plate 2. The spring column 3 includes a housing, a pressure sensor 9, and a spring 10. The pressure sensor 9 is disposed inside the housing. One end of the spring 10 is disposed on the pressure sensor 9, and the other end of the spring 10 is connected to the chuck base 11 of the three-grip clamp 5. The chuck base 11 is clamped inside the housing, and the three-grip clamp 5 is moved and extended with the spring 10.

[0026] In this embodiment of the invention, a sliding support 4 is further included, which is slidably disposed at the bottom end of the fixed plate. The sliding support 4 is configured with an L-shaped structure, and a circular hole 7 is provided at the front end of the L-shaped structure. The ultrasonic sensor 6 is disposed directly opposite the circular hole 7, and the ultrasonic sensor 6 can pass through the circular hole 7.

[0027] Motor 1 uses a 42 motor with a step angle of 1.8°. Combined with a lead screw, the push rod stroke is 60mm, and the theoretical positioning accuracy is... 0.05mm, maximum thrust 50N. Uses a motor driver board, which can be connected to an STM32 controller. The controller is an STM32 minimum system. The STM32 minimum system mainly controls the rotation angle of the lead screw based on the detected pressure sensor readings.

[0028] The pressure sensor is a full-bridge strain gauge sensor, which is amplified by the HX711 module and input to the controller for real-time return of the coupled pressure. The sliding support 4 uses a 6061 aluminum alloy frame and is equipped with interfaces for a magnetic adsorption module and a vacuum adsorption module at the bottom, supporting quick installation. In the non-working state, the support can be folded; in the working state, the support is pulled out and fixed to the surface of the object being measured by magnetic adsorption or vacuum adsorption.

[0029] Workflow:

[0030] ①Preparation before coupling

[0031] When not in operation, the device is in a folded state. Before coupling, the sliding support 4 of the device needs to be pulled out, the probe (ultrasonic sensor 6) connected, the magnetic adsorption module or vacuum adsorption module installed, and then fixed to the surface of the object being measured. At this time, the spring column 3 is in a naturally extended state, and the probe is 30mm away from the surface being measured.

[0032] ②Start coupling

[0033] The lead screw 8 extends at a speed of 2 mm / s. After the ultrasonic probe contacts the surface being measured, the spring column is compressed, triggering the pressure closed-loop control: the pressure sensor 9 collects the pressure signal in real time → the controller calculates the pressure deviation and outputs a pulse signal → the motor dynamically adjusts the displacement of the push rod until the pressure stabilizes within ±5% of the set value.

[0034] ③ Complete coupling

[0035] After the pressure stabilizes, the operator completes the signal acquisition process. Once acquisition is complete, the lead screw 8 retracts, the probe moves away from the object being measured, and the spring column 3 returns to its extended state.

[0036] Any matters not covered in this utility model are common knowledge.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An ultrasonic testing device with controllable coupling strength, characterized in that: The utility model relates to a kind of compression force detection device, including telescopic motion device, upper slide (2), compression force detection mechanism, ultrasonic sensor (6) and controller, telescopic motion device is connected with upper slide (2), and upper slide (2) is driven to move back and forth arrangement, compression force detection mechanism is arranged at the front end of upper slide (2), and moves back and forth along with upper slide (2), ultrasonic sensor (6) is arranged at the front end of compression force detection mechanism, controller is connected with compression force detection mechanism, ultrasonic sensor (6) and upper slide (2) respectively.

2. The device according to claim 1, wherein the coupling force is controllable. It also includes a fixed plate, motor (1) is fixedly arranged at one end of the fixed plate, and lead screw (8) is arranged through the fixed plate.

3. The device according to claim 1, wherein the coupling force is controllable. Compression force detection mechanism includes spring column (3) and three grab chuck (5), three grab chuck (5) is arranged at the front end of spring column (3), and the rear end of spring column (3) is fixedly connected with upper slide (2).

4. The device according to claim 3, wherein the device is characterized by: Spring column (3) includes shell, pressure sensor (9) and spring (10), pressure sensor (9) is arranged inside the shell, one end of spring (10) is arranged on pressure sensor (9), the other end of spring (10) is connected with chuck base (11) of three grab chuck (5), chuck base (11) is clamped in the shell, and three grab chuck (5) is arranged with spring (10) telescopic movement.

5. The device according to claim 2, wherein the device is characterized by: It also includes sliding support (4), and sliding support (4) is slidably arranged at the bottom end of the fixed plate.

6. The device according to claim 5, wherein the device is configured to control the coupling force. Sliding support (4) is arranged as L-shaped structure, and the front end of L-shaped structure is provided with round hole (7), ultrasonic sensor (6) is arranged opposite round hole (7), and ultrasonic sensor (6) can pass through round hole (7).

7. The device according to claim 1, wherein the device is characterized by: Telescopic motion device includes motor (1) and lead screw (8), the output end of motor (1) is connected with one end of lead screw (8), and upper slide (2) is connected with the sliding sleeve of lead screw (8), and upper slide (2) is arranged with the sliding sleeve of lead screw (8) to move back and forth.

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