Mobile laser ultrasonic testing device for large industrial facility defect detection

Abstract

The present application relates to a kind of mobile laser ultrasonic testing devices for large industrial facilities defect detection, with laser ultrasonic non-contact detection advantage, and can be stably supported in high operating environment in the surface of detection object, reduce shaking, improve detection accuracy and reliability.The device includes mobile base with wheels, liftable setting in the lifting support body of mobile base, setting in the front support body of its front, from the pair of support rods that protrude from front support body, and laser ultrasonic detector setting on front support body.Support rod front end contact and support the surface of detection object, detector generates ultrasonic wave by laser, to detect internal defect in non-contact mode, realize safe, efficient and stable field detection.

Description

Technical Field

[0001] This invention relates to a technology for defect detection of large industrial facilities, and more particularly to a mobile laser ultrasonic testing device with a movable structure that can stably suppress shaking that may occur during non-contact testing of large industrial facilities to ensure testing accuracy. Background Technology

[0002] Large industrial facilities such as petrochemical plants, storage tanks, and refining equipment are often subject to visual inspection or manual operation due to their structural characteristics of being located at high altitudes or occupying large areas. This presents limitations in terms of the safety of inspection personnel and the accuracy of inspections.

[0003] To overcome this limitation, in recent years, as exemplified by the "Ultrasonic Non-destructive Testing System Utilizing a Mobile Robot" disclosed in Korean Patent Publication No. 10-2024-0107833, the development of systems that enable testing equipment to move automatically and perform non-contact testing is being actively promoted.

[0004] However, when inspecting large industrial facilities with relatively high heights, even the slightest movement of the detector or supporting structure can make it difficult to obtain accurate detection signals, resulting in reduced reliability of inspection images and defect assessments.

[0005] For example, when the part being detected is located more than 10m above the ground, the support structure of the detector becomes unstable, and the influence of wind is also enhanced, which has a significant impact on the quality of the detection signal. This is especially fatal in laser-based non-contact detection methods.

[0006] [Existing Technical Documents] [Patent Documents] Korean Patent Publication No. 10-2024-0107833 (July 9, 2024) Summary of the Invention

[0007] Technical issues Therefore, the present invention is proposed to solve the various problems in the prior art as described above. The purpose of the present invention is to provide a mobile laser ultrasonic testing device that, while maintaining the advantages of non-contact testing using laser ultrasonic waves, can achieve stable contact and support of the structure of the object being tested even in high-altitude testing environments, thereby ensuring testing accuracy and reliability.

[0008] Technical solution To achieve the above objectives, the mobile laser ultrasonic testing device according to the present invention, as a mobile laser ultrasonic testing device for defect detection in large industrial facilities, is characterized in that it includes: a mobile base equipped with wheels for moving to the object to be tested; a lifting support body movably mounted on the mobile base; a front support body located in front of the lifting support body; a pair of support rods forming a pair and protruding forward side by side at the front support body, with their front ends contacting and supporting the surface of the object to be tested; and a laser ultrasonic detector mounted on the front support body, which irradiates a laser to generate laser ultrasonic waves without physical contact with the object to be tested, and uses the laser ultrasonic waves generated thereon to detect internal defects of the object to be tested in a non-contact manner.

[0009] One of its features is that the front end of the support rod is provided with an elastic contact member that deforms according to the surface shape of the object being detected to maximize the contact area.

[0010] In addition, it may be characterized in that a contact switch is provided at the front end of the support rod. When the elastic contact member comes into contact with the object to be detected and is pressed to a certain value or above, the contact switch is pressed together to generate a sensing signal.

[0011] In addition, the elastic contact member is characterized in that the front end is formed as a raised curved surface, which deforms according to the surface shape of the object being detected and makes the central part of the front end make priority contact. A receiving groove for accommodating the contact switch is formed in the central part of the rear end of the elastic contact member, so that the contact switch is pressed and switched by only a predetermined amount of pressure on the central part of the front end.

[0012] Additionally, it may be characterized by having a switch housing at the front end of the support rod, which houses the contact switch and elastically resets forward under the action of a rear spring. When the elastic contact member in contact with the object being detected is pressed, the switch housing retracts along with it, thereby pressing the contact switch and switching it. A protrusion is formed on the front of the switch housing that engages with the rear receiving groove of the elastic contact member, so that the elastic contact member can be detachably installed in the switch housing.

[0013] Additionally, the elastic contact member is a shape-adaptive elastic contact member, comprising: an elastic outer skin that can deform according to the shape of the object being detected; a pressure application line that can apply or release pressure to the interior of the elastic outer skin; and an adhesive member disposed on the bottom surface of the elastic outer skin to provide contact fixation force.

[0014] Additionally, the adhesive member is characterized by being made of a dielectrically responsive material whose rigidity changes with the application of an electric field, such that it deforms according to the shape of the object being tested when no electric field is applied, and its rigidity increases to maintain the deformed shape when an electric field is applied. Furthermore, when an electric field is applied, an electrostatic force is generated between the adhesive member and the object being tested to improve the contact fixing force.

[0015] In addition, it may be characterized in that the pressure application pipeline injects or discharges fluid into the elastic skin, causing the elastic skin to expand or contract according to the shape of the object being tested, and controlling the internal pressure to maintain the deformed shape.

[0016] Additionally, the shape-adaptive elastic contact member includes a spherical adsorption structure with multiple pores arranged in a certain pattern, so as to be able to adapt to the surface shape of the object being tested; the adsorption structure is configured to shrink and adhere to the surface of the object being tested when a vacuum is applied to generate an adsorption force, and to maintain the corresponding shape for a certain period of time while maintaining the vacuum state.

[0017] In addition, the shape-adaptive elastic contact member may also include a magnetorheological elastomer containing magnetic particles. The magnetorheological elastomer is formed into a pattern structure in which the magnetic particles are arranged in multiple strips at intervals. It is configured to deform freely according to the shape of the object being detected with low rigidity when no magnetic field is applied. If a magnetic field is applied, the magnetic particles are arranged to increase the rigidity of the elastomer, thereby keeping the deformed shape in a fixed state.

[0018] Additionally, the support rod may be configured such that its rear end is coupled to a slider that can move along a guide rail formed on the front support, so as to move forward and protrude or retract as the slider moves.

[0019] In addition, the slider is characterized in that it stops at a predetermined position according to the sensing signal of the contact switch provided at the front end of the support rod, and in the stopped state, it is controlled to cause the laser ultrasonic detector to irradiate a laser to generate laser ultrasonic waves.

[0020] In addition, it may be characterized in that a connecting member is provided between the pair of support rods to connect and integrate the two support rods, so as to prevent shaking or twisting during the detection process when the support rods protrude long toward the object to be detected.

[0021] Additionally, the front support is characterized by being composed of a frame structure, which includes a pair of guide rails for moving the support rod forward and backward, a slider that can move along each guide rail, and a connecting frame that connects the pair of guide rails to form a support structure.

[0022] Additionally, the connecting frame is characterized by being composed of a straight frame and a V-shaped frame that connect the pair of guide rails to each other, and the laser ultrasonic detector is fixedly mounted in a form that spans and is supported on the central protrusion of the straight frame and the V-shaped frame.

[0023] Invention Effects The mobile laser-ultrasonic inspection device according to the present invention can stably perform non-contact defect inspection using laser and ultrasonic waves on the outer surface of large industrial facilities.

[0024] In particular, even when the object being tested is located at a height, a pair of support rods remain in contact with the object being tested and stably support the testing device without wobbling, thereby ensuring the accuracy and repeatability of the detection signal.

[0025] In addition, an elastic contact member that can deform according to the shape of the object being tested is provided at the front end of the support rod, so that it can effectively fit even curved or irregular surfaces, and is linked with the switch structure used to sense whether it is in contact with the object being tested, thereby enabling control of the timing of detection and position alignment.

[0026] Furthermore, the elastic contact component can be realized by a shape-adaptive structure. By using a vacuum adsorption structure or a magnetorheological elastomer, its shape can be fixed after contact, and it can maintain a stable fit under external vibration.

[0027] Therefore, the present invention provides a beneficial technical effect that can simultaneously ensure structural stability and detection reliability even in high-precision non-contact detection environments. Attached Figure Description

[0028] Figure 1 This is a diagram illustrating the usage status of a mobile laser ultrasonic testing device according to an embodiment of the present invention.

[0029] Figure 2 This is a side view illustrating the configuration of a mobile laser ultrasonic testing device according to an embodiment of the present invention.

[0030] Figure 3 This is a top view of a mobile laser ultrasonic testing device according to an embodiment of the present invention.

[0031] Figure 4 This is a partial side view illustrating the front support and support rod in a mobile laser ultrasonic testing device according to an embodiment of the present invention.

[0032] Figure 5 This is a bottom view illustrating the frame structure of the front support in a mobile laser ultrasonic testing device according to a modified embodiment of the present invention.

[0033] Figure 6This is a partial side view illustrating the deformation of an elastic contact member in a mobile laser ultrasonic testing apparatus according to a modified embodiment of the present invention.

[0034] Figure 7 This is a reference diagram illustrating the surface pattern of the adhesive member of the deformed elastic contact member in a mobile laser ultrasonic testing apparatus according to a modified embodiment of the present invention. Detailed Implementation

[0035] The mobile laser ultrasonic testing device according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention can be adapted to various modifications and has multiple forms; therefore, specific embodiments are shown in the drawings and described in detail in the text. However, this is not intended to limit the invention to a specific disclosed form, but should be understood to include all modifications, equivalents, and even substitutions within the scope of the inventive concept and technology. Similar reference numerals are used for similar constituent elements in the description of the drawings. In the accompanying drawings, the dimensions of structures are shown enlarged from the actual dimensions for clarity of the invention, or reduced from the actual dimensions for ease of understanding of the general structure.

[0036] Furthermore, terms such as "first," "second," etc., can be used to describe various constituent elements, but the constituent elements should not be limited by these terms. These terms are only used to distinguish one constituent element from another. For example, without departing from the scope of this invention, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element. On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Commonly used terms, such as those defined in dictionaries, should be interpreted as having the meaning consistent with their meaning in the relevant technical context, and should not be interpreted as having an idealized or overly formal meaning unless explicitly defined herein.

[0037] <Example> Figure 1 This is a diagram illustrating the usage status of a mobile laser ultrasonic testing device according to an embodiment of the present invention. Figure 2 This is a side view illustrating the configuration of a mobile laser ultrasonic testing device according to an embodiment of the present invention. Figure 3 This is a top view of a mobile laser ultrasonic testing device according to an embodiment of the present invention. Figure 4 This is a partial side view illustrating the front support and support rod in a mobile laser ultrasonic testing device according to an embodiment of the present invention.

[0038] As shown in the figure, the mobile laser ultrasonic testing device 100 according to an embodiment of the present invention includes a mobile base 110, a lifting support body 120, a front support body 140, a pair of support rods 142, and a laser ultrasonic detector 150 as its main components. It is configured to maintain the advantages of non-contact testing using laser ultrasonic waves, and to achieve stable support and precise testing even for the object 10 located at a height of about 10m or more above the ground, by adopting an anti-sway structure based on the support rods 142.

[0039] The mobile laser ultrasonic testing device according to an embodiment of the present invention will now be described in detail, focusing on the aforementioned constituent elements.

[0040] The movable base 110 is a basic structure that enables the device to be moved around the object being detected. It is configured to have multiple wheels 111 on its lower part so that the device can be easily moved to the detection position.

[0041] Upon reaching the detection position, in order to stop moving and maintain a stable posture, the wheel 111 may be equipped with a fixing device such as a locking device or a stop. This prevents the device from unstable shaking or positional displacement during the detection process.

[0042] A lifting support body 120 is provided on the upper part of the movable base 110, which performs a supporting function so that the upper structure can be raised and lowered according to the height of the detection position. In this way, the movable base 110 stably supports the entire mobile laser ultrasonic detection device according to the embodiment of the present invention, providing a basis for the lifting function to operate.

[0043] In addition, the mobile base 110 of the present invention can be applied to large industrial facilities such as storage tanks or pipeline structures that need to be inspected over a large area, thereby enabling the inspection position to be changed freely and continuous inspection to improve work efficiency and ease of use.

[0044] The lifting support 120 is mounted on the movable base 110 and is constructed to be able to move up and down, so that the overall height of the device can be adjusted according to the position and height of the object being detected. This allows the front support 140 and the laser ultrasonic detector 150 to accurately reach the detection position of the object being detected.

[0045] The lifting support 120 may be composed of support rods 125 with a multi-stage sliding structure, wherein each stage of the support rods 125 is formed to be combined with each other to form a telescopic shape like a telescope. In particular, the lifting support 120 is configured such that multiple support rods 125 are inserted or withdrawn in stages along the vertical direction, and can be adjusted to the required height according to the detection position.

[0046] The support rods 125 constituting the lifting support body 120 are designed to have a certain cross-sectional strength to prevent swaying or bending that may occur during lifting and to ensure that the detection device can be stably supported in a fixed state. In addition, each support rod 125 is provided with a guide rail 141a, a locking device, or an anti-interference structure located on the inner or outer side to maintain alignment and stability during lifting and lowering.

[0047] The lifting support 120 can be driven by an electric motor, hydraulic cylinder, or pneumatic cylinder, and can also be operated manually as needed. The lifting support 120 ensures that it can be reached even when the object being tested is at a height of approximately 10 meters or more, enabling stable laser ultrasonic testing even in high-altitude testing environments.

[0048] The front support 140 is connected to the upper end of the lifting support 120, forming a structure that supports and guides a pair of support rods 142 and the laser ultrasonic detector 150. The front support 140 forms a structural foundation to stably configure the laser ultrasonic detector 150 and the support rods 142 according to the detection position and to maintain the alignment of the laser ultrasonic irradiation direction.

[0049] The front support 140 consists of a front-to-back guide rail 141a for moving a pair of support rods 142 forward and backward in the front-to-back direction, a slider 141b that moves along the corresponding guide rail 141a, and a connecting frame 142b that connects each guide rail 141a to maintain the rigidity of the overall frame.

[0050] The connecting frame 142b is composed of a straight frame 141d and a V-shaped frame 141c, each with a different function. The straight frame 141d is positioned along the front or rear of the guide rail 141a, guiding the movement of the slider 141b and maintaining a constant spacing between the guide rails 141a. In contrast, the V-shaped frame 141c is positioned at a sufficient distance from the straight frame 141d and along an oblique line, so as to more stably support the guide rail 141a structure formed along the longitudinal direction.

[0051] This provides a support structure that can stably fix the laser ultrasonic detector 150 without the need for an additional horizontal reinforcing frame. In particular, the laser ultrasonic detector 150 is configured to be supported across a central protrusion between the V-shaped frame 141C and the straight frame 141d.

[0052] This structure allows the laser ultrasonic detector 150 to be aligned with the center of the front support 140 and accurately positioned at the center of the spacing between the support rods 142. As a result, the laser ultrasonic waves can be precisely guided towards the center of the surface being inspected, improving the accuracy of the irradiation position and the reliability of the inspection.

[0053] The front support 140 is further supported by a rear-mounted intermediate support arm 130. The intermediate support arm 130 is linked to a cylinder or cylinder rod and can rotate vertically, thereby adjusting the angle of the front support 140. This structure of the intermediate support arm 130 not only suppresses structural sway but also allows for precise adjustment of the angle of the laser ultrasonic detector 150 according to the position of the object being detected.

[0054] As a result, the front support 140 comprehensively constitutes the sliding structure of the slider 141b, the centrally configured structure of the laser ultrasonic detector 150, and the angle adjustment structure, thereby providing a basis for effectively performing precise non-contact detection using laser ultrasonic waves.

[0055] The support rod 142 protrudes forward from the front support body 140, is configured to contact the surface of the object being tested, and plays a key role in maintaining a constant relative position between the object being tested and the laser ultrasonic detector 150, and suppressing the shaking of the entire device during testing to improve testing accuracy. The support rods 142 are configured as a pair, each capable of moving forward and backward along left and right guide rails 141a formed on the front support body 140 via a slider 141b. Thus, the support rods 142 are configured to protrude forward to contact the surface of the object being tested during testing preparation, and to retract backward when testing is completed or in standby mode.

[0056] An elastic contact module 143, centered on an elastic contact member 143e, is provided at the front end of the support rod 142. This elastic contact member 143e can deform according to the surface shape of the object being tested to maximize the contact area. The front of the elastic contact member 143e is formed into a convex curved surface, allowing it to naturally conform to the curved or uneven surface of the object being tested and maintain a stable contact state during testing. In particular, the elastic contact member 143e is made of a polyurethane pad. Polyurethane material has excellent elastic deformation and recovery force under external loads, is not easily deformed under repeated contact, and has excellent durability and wear resistance, making it suitable for repeated testing environments.

[0057] A receiving groove E1 for accommodating a contact switch 143d is formed at the rear center of the elastic contact member 143e. A switch housing 143b, which internally houses the contact switch 143d, is inserted into this receiving groove E1. The switch housing 143b is configured to elastically return forward by means of a rear spring 143c supported by a stop member 143a. In the detection preparation state, if the elastic contact member 143e comes into contact with the object to be detected and is pressed to a certain value, the switch housing 143b retracts along with it, simultaneously pressing the internal contact switch 143d to generate a sensing signal. With this structure, the support rod 142 can electrically sense whether it is actually in contact with the object to be detected, and can control the laser irradiation timing of the laser ultrasonic detector 150 based on the sensed signal.

[0058] Furthermore, a protrusion D1 is formed on the front of the switch housing 143b to engage with the receiving groove E1 of the resilient contact member 143e. Therefore, the resilient contact member 143e can be detachably installed on the switch housing 143b. This structure allows for easy replacement of the resilient contact member 143e according to user needs and is compatible with various resilient contact members 143e depending on the material or surface shape of the object being detected.

[0059] To prevent swaying or twisting during the testing process and improve structural stability, a connecting member 142a is provided between the pair of support rods 142, connecting and integrating them. The connecting member 142a enables the pair of support rods 142 to move synchronously while maintaining a predetermined distance, thereby helping to maintain a stable contact force at the testing position and preventing twisting of the support structure.

[0060] The structure of this support rod 142 improves the accuracy and reliability of non-contact detection using laser and ultrasound by simultaneously satisfying the requirements of contact adaptability to various surface shapes of the object being detected, control linkage based on contact perception, and structural stability during detection.

[0061] The laser-ultrasonic detector 150 functions by generating ultrasonic waves using a laser and receiving these waves non-contactly to determine the presence of defects. This allows for non-destructive testing of internal defects without physical contact with the surface of the object being inspected. The laser-ultrasonic detector 150 uses a laser to momentarily irradiate the surface of the object with short, intense energy bursts, inducing a thermoelastic wave that is converted into an ultrasonic wave and propagates within the object. The propagating ultrasonic wave is reflected at defects or boundaries within the material, and the reflected waves are sensed non-contactly, thus imaging information about internal damage or defects.

[0062] The laser-ultrasonic detector 150 can consist of an ultrasonic generator based on a Q-switched laser and a receiving device including a continuous-wave laser interferometer or a laser Doppler vibrometer (LDV) sensor. These two devices are arranged at a certain interval on the same plane, thus enabling simultaneous scanning of the surface of the object being inspected. By sensing the ultrasonic waves propagating along the thickness direction in real time, ultrasonic propagation images or C-scan images can be generated based on time-domain or frequency-domain data, and various internal damages such as cross-sectional defects, delamination, and foreign object intrusion can be visualized. This laser-ultrasonic technology is effectively applicable to structures that are difficult to physically contact, curved surfaces, and high-temperature environments, and its applications are expanding across various industrial sectors.

[0063] The laser-ultrasonic detector 150 is mounted across the central protrusion of the straight frame 141d and the V-shaped frame 141C within the connecting frame 142b of the front support 140. This structure maintains the rigidity of the entire device while offering the advantages of a stable central position between the support rods 142, minimizing alignment errors between the irradiation direction and the object surface. In particular, the V-shaped frame 141C, while supporting the elongated guide rail 141a structure, provides the angle and space for fixing the laser-ultrasonic detector 150 without the need for an additional frame, thus offering advantages in structural simplicity and setup accuracy.

[0064] The laser ultrasonic detector 150 based on this structure and technology has the advantages of enabling precise non-contact inspection even at high locations in large industrial facilities or in inaccessible areas, and achieving high-resolution and high-reliability defect detection.

[0065] The aforementioned mobile laser ultrasonic testing device according to an embodiment of the present invention enables non-contact testing of the outer surface of large and tall industrial facilities such as storage tanks. It comprises a movable base, an adjustable height lifting support 120, a front support 140 for guiding support rods 142, a pair of support rods 142 for supporting the object to be tested, and a laser ultrasonic detector 150 that generates and receives laser ultrasonic waves based on lasers.

[0066] The mobile laser ultrasonic testing device according to embodiments of the present invention ensures structural stability and rigidity, enabling accurate and stable maintenance of the detection point even at heights exceeding 10 meters. Furthermore, the front end of the support rod 142 is equipped with an elastic contact member 143e based on a polyurethane pad, adaptable to curved surfaces, thereby maximizing the contact area with the object being tested and improving the accuracy of the detection signal. In addition, the combination of a switch structure for contact sensing, a connection structure between the support rods 142, and a frame-integrated laser ultrasonic detector 150 support method provides a hardware foundation for precise and stable non-contact laser ultrasonic testing.

[0067] Figure 6 This is a partial side view illustrating the deformation of the elastic contact member in a mobile laser ultrasonic testing device according to a modified embodiment of the present invention. Figure 7 This is a reference diagram illustrating the surface pattern of the adhesive member of the deformed elastic contact member in a mobile laser ultrasonic testing apparatus according to a modified embodiment of the present invention.

[0068] A shape-adaptive elastic contact member of a modified form may be provided at the front end of the support rod 142 according to the modified embodiment. This shape-adaptive elastic contact member can improve contact stability and fixing force while more actively adapting to the external shape.

[0069] like Figure 6 As shown, a shape-adaptive elastic contact member 240 is installed at the front end of the support rod 142. The elastic contact member 240 consists of an elastic outer skin 243a, a pressure application line 243b, and an adhesion member 243c.

[0070] The elastic outer skin 243a is made of highly elastic materials such as silicone, polyurethane, and EPDM, and is shaped into a hemispherical or curved surface to flexibly deform according to the curved shape of the object being tested. A pressure application line 243b is connected inside the elastic outer skin 243a to allow the injection or discharge of air or fluid. The pressure inside the elastic outer skin 243a is controlled by the pressure application line 243b, causing the outer skin to expand or contract to adapt to the shape of the object being tested.

[0071] If the internal pressure is maintained after pressure is applied, the elastic outer skin 243a can maintain its deformed shape for a certain period of time, which helps to fix the contact shape and ensure positional stability during the detection process. An adhesive member 243c is provided in front of the elastic outer skin 243a, which directly contacts the object being detected and provides an adhesive fixing force.

[0072] The adhesive component 243c may include a dielectric responsive adhesive material whose rigidity changes with the applied electric field, an electrostatic adhesive layer, or a vacuum adsorption structure, thereby enabling flexible adhesion initially and maintaining a fixed shape or improving contact stability through adsorption force after contact.

[0073] therefore, Figure 6 The shape-adaptive elastic contact member 240 shown is a structure that integrates the shape deformation and fixation of the elastic outer skin 243a, the stability of the adhesion force, and the contact sensing function, and is configured to simultaneously improve the contact precision and detection reliability in the detection environment.

[0074] According to a modified embodiment, the shape-adaptive elastic contact member 240 includes a magnetorheological elastomer containing magnetic particles internally, such as... Figure 7 As shown, it can be formed into a structure in which magnetic particles are arranged in multiple strip patterns at certain intervals.

[0075] Magnetorheological elastomers are typically based on polymer materials such as silicone rubber, polyurethane, and PDMS, with ferrous or iron oxide magnetic particles (e.g., Fe3O4, Fe) dispersed within them. These magnetic particles are not uniformly distributed but arranged in multiple vertical stripes, allowing for a more significant change in stiffness before and after the application of a magnetic field. In this structure, the interaction between the magnetic particles is weak when no magnetic field is applied, and the entire elastomer maintains low stiffness, thus enabling free deformation according to the curved or irregular surface shape of the object being tested.

[0076] Therefore, upon initial contact, it can adhere to a large area while providing a gentle contact and uniformly conforming to the shape of the object being tested. Conversely, if a magnetic field is applied, the magnetic particles within each strip align along the magnetic field lines, forming a microscopic particle structure within the elastomer. Consequently, the shear stiffness of the elastomer increases dramatically, fixing it in a state where it is not easily deformed even under external pressure.

[0077] In other words, it allows the deformed shape to be preserved intact and maintains a stable contact position without wobbling during detection. Compared to existing uniform magnetorheological structures with fully distributed magnetic particles, this strip-patterned structure can induce a rapid and strong stiffness amplification response when a magnetic field is applied, while maintaining lower initial stiffness. This is particularly effective for environments where the object being detected changes repeatedly, and for surface detection environments with diverse curvatures.

[0078] Therefore, including Figure 7The shape-adaptive elastic contact member 240 of the pattern structure shown achieves the following dual functions: it can actively conform to the surface shape of irregular structures and maintain a fixed state using a magnetic field. This helps to further improve the accuracy and reliability of laser ultrasonic non-contact detection devices.

[0079] The preferred embodiments of the present invention have been described above, but various variations, modifications, and equivalents are possible. Clearly, the present invention can be appropriately modified and applied in the same way. Therefore, the foregoing description is not intended to limit the scope of the invention as defined by the following patent claims.

[0080] [Symbol Explanation] 110: Mobile base; 120: Lifting support body 130: Middle support arm; 140: Front support body 143: Flexible contact module; 150: Laser ultrasonic detector

Claims

1. A mobile laser-ultrasonic inspection device for defect detection in large industrial facilities, comprising: A mobile base equipped with wheels to allow it to move to the object being detected; A lifting support body, which is vertically and vertically mounted on the movable base; A front support body is disposed in front of the lifting support body; A pair of support rods, which form a pair and protrude forward side by side at the front support body, and whose front ends contact and support the surface of the object to be tested; and A laser ultrasonic detector is mounted on the front support and generates laser ultrasonic waves by irradiating a laser without physical contact with the object being tested. The generated laser ultrasonic waves are then used to detect internal defects in the object being tested in a non-contact manner.

2. The mobile laser ultrasonic testing device according to claim 1, characterized in that, The front end of the support rod is provided with an elastic contact member that deforms according to the surface shape of the object being detected to maximize the contact area.

3. The mobile laser ultrasonic testing device according to claim 2, characterized in that, A contact switch is provided at the front end of the support rod. When the elastic contact member comes into contact with the object being detected and is pressed to a certain value or above, the contact switch is pressed together to generate a sensing signal.

4. The mobile laser ultrasonic testing device according to claim 3, characterized in that, The front of the elastic contact member is formed as a convex curved surface, which deforms according to the surface shape of the object being detected and allows the central part of the front to make preferential contact. A receiving groove for accommodating the contact switch is formed at the rear center of the elastic contact member, so that the contact switch can be pressed and switched by a predetermined amount of pressure at the front center alone.

5. The mobile laser ultrasonic testing device according to claim 4, characterized in that, A switch housing is provided at the front end of the support rod, inside which the contact switch is housed. The switch housing elastically returns to its original position under the action of a rear spring. When the elastic contact member in contact with the object being detected is pressed, the switch housing retracts accordingly, thereby pressing the contact switch and switching it. A protrusion is formed on the front of the switch housing, which engages with the rear receiving groove of the resilient contact member, thereby allowing the resilient contact member to be detachably mounted on the switch housing.

6. The mobile laser ultrasonic testing device according to claim 2, characterized in that, The elastic contact member is a shape-adaptive elastic contact member, which includes: an elastic outer skin that can deform according to the shape of the object being detected; a pressure application line that can apply or release pressure to the interior of the elastic outer skin; and an adhesive member disposed on the bottom surface of the elastic outer skin to provide contact fixation force.

7. The mobile laser ultrasonic testing device according to claim 6, characterized in that, The adhesive member is made of a dielectric responsive material whose rigidity changes with the application of an electric field, so that it deforms according to the shape of the object being tested when no electric field is applied, and its rigidity increases to maintain the deformed shape when an electric field is applied. Furthermore, when an electric field is applied, an electrostatic force is generated between the member and the object being tested to improve the contact fixation force.

8. The mobile laser ultrasonic testing device according to claim 6, characterized in that, The pressure application line injects or discharges fluid into the elastic outer skin, causing the elastic outer skin to expand or contract according to the shape of the object being tested, and controls the internal pressure to maintain the deformed shape.

9. The mobile laser ultrasonic testing device according to claim 6, characterized in that, The shape-adaptive elastic contact member includes a spherical adsorption structure with multiple pores arranged in a certain pattern, so as to adapt to the surface shape of the object to be detected; the adsorption structure is configured to shrink and adhere to the surface of the object to be detected when a vacuum is applied to generate an adsorption force, and maintain the corresponding shape for a certain period of time while maintaining the vacuum state.

10. The mobile laser ultrasonic testing device according to claim 6, characterized in that, The shape-adaptive elastic contact member also includes a magnetorheological elastomer containing magnetic particles. The magnetorheological elastomer is formed as a pattern structure in which magnetic particles are arranged in multiple strips at intervals. It is configured to deform freely according to the shape of the object being tested with low rigidity when no magnetic field is applied. If a magnetic field is applied, the magnetic particles are arranged to increase the rigidity of the elastomer, thereby keeping the deformed shape in a fixed state.

11. The mobile laser ultrasonic testing device according to claim 1, characterized in that, The support rod is configured such that its rear end is coupled to a slider that can move along a guide rail formed on the front support, so as to move forward and protrude or retract as the slider moves.

12. The mobile laser ultrasonic testing device according to claim 11, characterized in that, The slider stops at a predetermined position based on the sensing signal from the contact switch located at the front end of the support rod, and in the stopped state, it is controlled to cause the laser ultrasonic detector to irradiate a laser to generate laser ultrasonic waves.

13. The mobile laser ultrasonic testing device according to claim 11, characterized in that, A connecting member is also provided between the pair of support rods to connect the two support rods and integrate them into one unit, so as to prevent shaking or twisting during the detection process when the support rods protrude long towards the object being detected.

14. The mobile laser ultrasonic testing device according to claim 11, characterized in that, The front support is composed of a frame structure, which includes a pair of guide rails for moving the support rod forward and backward, a slider that can move along each guide rail, and a connecting frame that connects the pair of guide rails to form a support structure.

15. The mobile laser ultrasonic testing device according to claim 14, characterized in that, The connecting frame consists of a straight frame and a V-shaped frame that connect the pair of guide rails to each other. The laser ultrasonic detector is fixedly installed in a configuration that spans and is supported on the central protrusion of the straight frame and the V-shaped frame.

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