Ultrasonic phased array detection system and method for grid hollow structure

Abstract

The invention relates to a grid hollowed-out structure ultrasonic phased array detection system and method, and belongs to the technical field of composite material nondestructive testing. The grid hollowed-out structure ultrasonic phased array detection system comprises a rotating platform, a multi-degree-of-freedom scanning manipulator, a graded water immersion coupling system, an ultrasonic phased array detection module, a motion control system and an intelligent data analysis system, and the rotating platform drives a workpiece to rotate; the multi-degree-of-freedom scanning manipulator is used for carrying out axial translation and space attitude adjustment; the grading water immersion coupling system is used for carrying out local water immersion on a workpiece detection area, and the motion control system is used for generating a scanning path according to a workpiece three-dimensional model and geometrical characteristics of grid ribs and optimizing the track and posture of a multi-degree-of-freedom scanning manipulator; the intelligent data analysis system collects scanning data, reconstructs the scanning data into a complete workpiece three-dimensional image, identifies and marks defects, and automatically generates a detection result. Through the local water immersion and ultrasonic phased array technology, the problems of unstable acoustic coupling, serious signal interference, low detection coverage rate and the like can be solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nondestructive testing of composite materials, and particularly relates to a grid open structure ultrasonic phased array detection system and method. BACKGROUND

[0002] The grid open structure is a load-bearing structure based on high-modulus carbon fiber composite materials, and has the characteristics of good topological optimization of configuration and flexible design parameters. Such a structure can be flexibly designed by changing parameters such as grid spacing, angle, rib width and height, so as to meet different load-bearing and functional requirements. However, the existing quality evaluation method faces many challenges in analyzing the overall performance of the grid structure. In the aspect of defect nondestructive testing, the grid framework of the grid open structure, the difficulty of acoustic coupling caused by the detection state of the small cross section, the strong scattering signal intensity, the complex acoustic wave path and other problems restrict the high-precision and all-around detection and evaluation of the quality of the grid rib of the composite open structure, and the defect morphology cannot be accurately judged, resulting in insufficient nondestructive testing accuracy.

[0003] At present, the traditional ultrasonic detection method cannot meet the detection needs of such complex structures, and an efficient and accurate detection method is urgently needed to solve the above problems. SUMMARY

[0004] The purpose of the present application is to provide a grid open structure ultrasonic phased array detection system and method, which can solve the problems of unstable acoustic coupling, serious signal interference and low detection coverage in the prior art through local water immersion technology and ultrasonic phased array technology.

[0005] The above-mentioned purpose of the present application is mainly realized by the following technical scheme: A grid open structure ultrasonic phased array detection system, comprising a rotating platform, a multi-degree-of-freedom scanning manipulator, a hierarchical water immersion coupling system, an ultrasonic phased array detection module, a motion control system and an intelligent data analysis system, wherein, The rotating platform is used to drive the workpiece to rotate, and the torque change is monitored in real time during rotation, and the machine is automatically stopped for protection when abnormal resistance is detected; The multi-degree-of-freedom scanning manipulator is used to carry the ultrasonic phased array detection module, and can perform axial translation and spatial attitude adjustment according to the control signal of the motion control system; The hierarchical water immersion coupling system is used for local water immersion of the workpiece detection area; The ultrasonic phased array detection module is used for scanning the water immersion detection area of the workpiece; The motion control system is used to generate a scanning path according to the three-dimensional model of the workpiece and the geometric characteristics of the grid rib, and to optimize the trajectory and attitude of the multi-degree-of-freedom scanning manipulator, and to send a control signal to the multi-degree-of-freedom scanning manipulator; An intelligent data analysis system is used to collect the scanning data of the ultrasonic phased array detection module in real time, reconstruct the scanning data into a complete three-dimensional image of the workpiece, identify defects and mark them, and automatically generate a detection result.

[0006] The rotating platform comprises a workpiece automatic centering device and a flexible support roller for limiting axial movement of the workpiece during rotation, and a transition roller for reducing frictional resistance between the workpiece and the rotating platform.

[0007] The multi-degree-of-freedom scanning manipulator comprises a linear conveying table and a six-degree-of-freedom manipulator, the linear conveying table is arranged along the axial direction of the workpiece, the six-degree-of-freedom manipulator is arranged on the linear conveying table, and a probe clamp is arranged at the end of the six-degree-of-freedom manipulator for configuring the ultrasonic phased array detection module.

[0008] The hierarchical water immersion coupling system comprises an inner water tank and an outer water tank, the inner water tank is used to place the detection probe of the ultrasonic phased array detection module and coupling water, and the outer water tank is used to receive water overflowing from the inner water tank and perform self-cleaning, and the filtered water is returned to the inner water tank.

[0009] The temperature of the coupling water is 20±0.5℃, and the coupling water depth H is 0.2D+50mm, wherein D is the diameter of the workpiece.

[0010] The intelligent data analysis system automatically generates a detection report after the detection is completed, the detection report comprises workpiece basic information, detection parameter setting, defect distribution map, defect detailed list, qualification determination conclusion and detection process quality evaluation, and if the workpiece detection result is unqualified, the defect position is marked in the detection report.

[0011] A plurality of radial adjustable support points are arranged on the rotating platform, the radial adjustable support points are made of polyurethane, and a laser range finder is used to monitor the contact state of the workpiece and the radial adjustable support points, so that the deformation of the clamped workpiece is less than 0.1mm.

[0012] The ultrasonic phased array detection module adopts a phased array probe with a center frequency of 5-7.5MHz, adopts a fan-shaped scanning mode, the scanning angle range is 40°~70°, the scanning speed is 10-20mm / s, and the focusing depth is 10-25mm.

[0013] A grid hollow structure ultrasonic phased array detection method adopts the detection system, and specifically comprises the following steps: (1) initializing the detection system, and then installing the workpiece on the rotating platform; (2) moving the multi-degree-of-freedom scanning manipulator to the starting position, and immersing the detection probe of the ultrasonic phased array detection module into the coupling water; (3) Start the rotating platform to drive the workpiece to rotate at a set speed, and the ultrasonic phased array detection module starts to collect data. (4) After each rotation cycle is completed, the motion control system sends a control signal to the multi-degree-of-freedom scanning robot. The multi-degree-of-freedom scanning robot moves along the workpiece axis according to the preset step distance. After moving to the position, it continues to perform the next rotation scan until the entire workpiece is inspected. (5) The intelligent data analysis system collects the scanning data from the ultrasonic phased array detection module, reconstructs the scanning data into a complete three-dimensional image of the workpiece, identifies and marks defects, and automatically generates the detection results.

[0014] During the testing process, the following are monitored in real time: the temperature fluctuation of the coupling water, the load of the drive motors of the rotating platform and the multi-degree-of-freedom scanning robot, the motion positioning accuracy, and the validity of the test data. If any abnormality is detected, the testing is paused and the operator is prompted to intervene.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: (1) The present invention adopts a local water immersion method to form a stable water coupling layer in the detection area, so as to achieve effective acoustic coupling with the minimum amount of water, thereby avoiding interference and safety hazards to the moving mechanism and electrical circuits caused by overall water immersion. While ensuring detection accuracy, it improves the reliability and environmental adaptability of the system.

[0016] (2) The present invention significantly improves the resolution and accuracy of detection through ultrasonic phased array technology; the water circulation system provides a stable coupling environment and solves the problem of difficult acoustic coupling.

[0017] (3) The present invention ensures that large workpieces are scanned in all directions without blind spots by the coordinated work of the rotating platform and the robot. The entire inspection process is completed automatically, reducing human intervention and improving inspection efficiency and consistency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the detection device of the present invention; Figure 2 This is a flowchart of the scanning process of the present invention. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: like Figure 1 As shown, the present invention discloses a mesh-hollow structure ultrasonic phased array detection system, comprising a rotating platform 1, a multi-degree-of-freedom scanning robot 2, a hierarchical water immersion coupling system 3, an ultrasonic phased array detection module 4, a motion control system 5, and an intelligent data analysis system 6, wherein... Rotary platform 1, driven by a servo motor and a precision reduction mechanism, can smoothly rotate workpieces with a maximum diameter of 3 meters. The rotation speed is continuously adjustable from 0.5 to 5 rpm, and the angular positioning accuracy reaches ±0.05°. The platform is equipped with an automatic workpiece centering device and flexible support rollers to ensure no axial movement of cylindrical workpieces of different specifications during rotation. Simultaneously, the transition roller design effectively reduces the frictional resistance between the workpiece and the platform. Torque changes are monitored in real time during rotation, and the machine automatically stops for protection when abnormal resistance is detected.

[0020] The multi-DOF scanning robot 2 possesses seven-axis motion capability. Specifically, it includes a linear conveyor table arranged along the workpiece axis and a six-DOF robotic arm mounted on it, enabling composite motion of "one axial translation + six spatial attitude adjustments." The maximum extension radius of its motion capability reaches 4.5 meters, with a repeatability better than 0.02mm. A dedicated probe holder is installed at the end of the robot, compatible with various models of ultrasonic phased array probes. The motion control system 5 automatically generates the scanning path based on the workpiece's CAD model and automatically optimizes the probe trajectory and attitude according to the geometric characteristics of the mesh ribs, ensuring that the probe and the inspection surface maintain a stable and optimal coupling state throughout the inspection process. This system is suitable for automated precision inspection of large-size, complex curved surface structures.

[0021] The graded water immersion coupling system 3 includes an inner water tank and an outer water tank. The inner water tank holds the probe and the coupling water, while the outer water tank receives water overflowing from the inner tank and self-cleans it via a pump. The filtered water is then pumped back into the inner water tank. The inner water tank is made of 316L stainless steel, and its volume can be adjusted according to the workpiece size. It has a built-in constant temperature control system that can stably control the coupling water temperature within the range of 20±0.5℃. The outer water tank is equipped with a multi-stage filtration device, including a primary stainless steel filter screen and a secondary precision ceramic filter element, which can effectively filter out suspended particles and impurities, ensuring that the water quality meets the requirements for ultrasonic coupling. The coupling water level is automatically adjusted according to the workpiece diameter using the formula H=0.2D+50mm, where H is the water depth and D is the workpiece diameter. This design can achieve the optimal immersion depth of the detection area for workpieces of different diameters, minimizing water consumption while ensuring coupling effect.

[0022] The ultrasonic phased array inspection module 4 adopts a 128-channel fully parallel architecture, supporting simultaneous reception of up to 32 channels. The system's operating frequency range is adjustable from 1-15MHz, allowing selection of the optimal frequency based on inspection requirements. The pulse repetition frequency can reach up to 10kHz, meeting high-speed scanning needs. The system incorporates various dedicated inspection techniques, including sector scanning and linear scanning, enabling optimized inspection of different types of defects.

[0023] The motion control system 5, based on a PLC and servo drive architecture and using EtherCAT bus communication, has a control cycle of 1ms and can achieve high-precision synchronization between the axial movement of the multi-degree-of-freedom scanning robot 2 and the rotary platform 1. The system integrates a multi-axis linkage control algorithm, achieving a step displacement accuracy of ±0.1mm for the multi-degree-of-freedom scanning robot 2. It supports adjustable speed and acceleration parameters and features collision detection and emergency stop protection. The step movement of the multi-degree-of-freedom scanning robot 2 is triggered by the encoder signal of the rotary table, ensuring the circumferential scanning integrity of each detection section.

[0024] The Intelligent Data Analysis Software 6 is equipped with a dedicated ultrasonic phased array analysis platform and adopts a 128-channel parallel processing architecture for real-time acquisition and processing of inspection data. The software features an automatic image stitching function, reconstructing segmented scan data into a complete 3D image of the workpiece. It incorporates an industry-standard automatic evaluation algorithm that can identify typical defects such as delamination and porosity, and annotate their location and dimensions. Inspection results automatically generate OK / NG judgments and communicate with the PLC via an OPC UA interface to achieve automatic sorting of qualified and unqualified products.

[0025] After the workpiece is hoisted into place, its bottom ribs form contact support with the rotating platform. Driven by a servo motor, the rotating platform drives the workpiece to rotate precisely around its axis. Simultaneously, a robotic arm mounted on a multi-axis joint carries an ultrasonic phased array probe, enabling multi-degree-of-freedom positioning along the workpiece's axial, radial, and circumferential directions. The motion control system 5 synchronously plans the rotation angle of the rotating platform and the robotic arm's motion trajectory, achieving full coverage of the relative scanning path between the probe and the inspected mesh ribs, thus completing the automated, high-precision inspection of large-sized cylindrical components.

[0026] Workpiece installation: After the workpiece is hoisted onto the inspection table, its bottom ribs contact the rotating platform, which then drives the workpiece to rotate around its axis. Simultaneously, a robotic arm carrying an ultrasonic phased array probe moves along the workpiece's axial and / or circumferential directions. Through the coordinated movement of the rotating platform and the robotic arm, continuous, full-coverage scanning of all rib areas of the mesh cylinder is achieved, making it particularly suitable for the automated inspection of large-sized, complex curved surface structures.

[0027] For coupling, a localized water immersion method is adopted. An inner water tank matching the workpiece size is set below the workpiece, and the water level in the tank is maintained at a local height that only submerges the rib area of ​​the workpiece, thereby forming a stable water coupling layer in the detection area. This design achieves effective acoustic coupling with minimal water volume, avoiding interference and safety hazards to the moving mechanism and electrical circuits caused by overall water immersion, and improving the system's reliability and environmental adaptability while ensuring detection accuracy.

[0028] Scanning process: The robotic arm extends into the workpiece to scan the portion that is partially submerged in water; After the underwater section is scanned, the rotating platform rotates the workpiece to a fixed angle. The robotic arm scans the workpiece again, repeating this process until the entire workpiece has been scanned.

[0029] Data processing: The ultrasound software performs mosaic processing on the scan data and provides judgment results based on the testing standards; After the test is completed, the software automatically analyzes the current test data. If the data is qualified, it displays "OK" and notifies the PLC to process it as a qualified product. If the data is unqualified, it displays "NG" and notifies the PLC to process it as a non-qualified product.

[0030] Environmental control: The equipment can be used in environments with a temperature range of 0-40℃ and a humidity level of ≤90%. The sink is made of stainless steel, and the frame is painted to ensure rust and dust prevention.

[0031] Preferred solution The height of the ultrasonic probe in the water tank is adjustable to accommodate workpieces of different sizes.

[0032] During the inspection, the system preparation and workpiece clamping are carried out first. The workpiece with the grid structure to be inspected is hoisted onto the rotating platform, and a multi-point support clamping scheme optimized by finite element analysis is adopted to ensure that the deformation of the workpiece is less than 0.1mm during the inspection process.

[0033] After system initialization, the corresponding detection process parameters are loaded. For carbon fiber composite mesh structures, a working frequency of 5-7.5MHz is typically selected, using a fan-shaped scanning mode, with the focusing depth set within the range of 10-25mm based on the mesh unit size. The scanning speed is set according to the required detection resolution, generally 10-20mm / s.

[0034] After the inspection begins, the multi-degree-of-freedom scanning robot 2 moves along a predetermined three-dimensional trajectory, while the rotating platform 1 rotates at set angles. The scanning path is automatically generated based on the workpiece's CAD model, and the system calculates the optimal probe posture in real time to ensure that the sound beam axis is always perpendicular to the inspection surface. Inspection data is acquired and transmitted to the analysis system in real time. The raw signal first undergoes digital filtering and wavelet noise reduction to suppress various interference noises. Then, time-frequency analysis methods are used to extract signal features, and feature fusion technology is used to enhance the defect signal. Finally, the signal is input into a trained deep learning model for defect identification and classification. The system can identify typical defects such as pores, delamination, and cracks, and accurately measure their size and location.

[0035] After inspection, the system automatically generates an inspection report, including a defect distribution map, dimensional measurement results, and pass / fail criteria. All data is stored in a database for easy access and review. Internal quality is assessed according to the requirements of GJB 2895-1997 "General Specification for Carbon Fiber Composite Laminates and Laminates," with internal quality grades divided into A, B, and C. For non-conforming workpieces, the system marks the specific defect locations for subsequent processing.

[0036] like Figure 2 As shown, the specific operation of the ultrasonic phased array detection method with a mesh-like hollow structure provided by the present invention is as follows: 1. System preparation and workpiece clamping Before testing begins, all modules of the system must be initialized. First, check the working status of the water circulation system, ensuring that the liquid levels in both the inner and outer water tanks are within the normal range, the water pump is operating normally, and the filtration system is working effectively. Inject deionized water into the inner water tank, and stabilize the water temperature within the range of 20±0.5℃ using the constant temperature control system. Based on the diameter D of the workpiece to be inspected, automatically calculate and set the coupling water depth H according to the formula H=0.2D+50mm to ensure the probe achieves optimal coupling effect.

[0037] The workpiece clamping employs a multi-point support scheme optimized using finite element analysis. A gantry crane smoothly lifts the workpiece onto a rotating platform, where it is positioned by contact with the platform via cylindrical reinforcing ribs. During clamping, three radially adjustable support points are initially installed at each end of the workpiece. These support points are made of polyurethane, providing sufficient support without damaging the workpiece surface. A laser rangefinder monitors the contact state between the workpiece and each support point to ensure that the workpiece deformation after clamping is less than 0.1 mm. For particularly precise workpieces, an online strain monitoring system can be used to monitor clamping stress in real time.

[0038] 2. System Parameter Settings After system initialization, the corresponding process parameters are set according to the workpiece material, structure, and inspection requirements. For typical carbon fiber composite mesh structures, a phased array probe with a center frequency of 5MHz is typically selected, using a fan-shaped scanning mode with a scanning angle range of 40°~70°. The focusing method is optimized based on the mesh cell size, generally setting the focal point at half the thickness of the mesh ribs. The pulse repetition frequency is set to 2kHz to ensure detection speed while avoiding signal aliasing.

[0039] Scan parameter settings include: ① Axial step distance: usually set to 80% of the effective width of the probe to ensure sufficient coverage overlap; ② Rotation indexing angle: Calculated based on the workpiece diameter and detection resolution requirements, and generally set between 5° and 15°; ③ Scanning speed: Taking into account both detection efficiency and signal quality, it is usually controlled within the range of 10-15 mm / s.

[0040] ④ The system supports parameter template function, which can save commonly used process parameters as preset schemes and call them directly during subsequent testing, improving work efficiency.

[0041] 3. Execution of the testing process The testing process operates in fully automatic mode. After starting the testing program, the system works according to the following procedure: The multi-degree-of-freedom scanning robot 2 first moves to the starting position, and the probe is accurately positioned by the quick-change device at the end of the robot. The robot slowly immerses the probe in the coupling water, and the contact state between the probe and the workpiece is monitored by a force sensor to ensure good coupling without putting excessive pressure on the workpiece.

[0042] The rotary platform begins to rotate at a set speed at a constant speed, while the ultrasonic phased array system begins to acquire data. After each rotation cycle, the motion control system 5 sends a trigger signal to the multi-degree-of-freedom scanning robot 2, which then moves along the workpiece axis according to a preset step distance. Once in position, the rotary platform continues the rotational scanning for the next cycle, repeating this cycle until the entire workpiece is inspected.

[0043] During the testing process, the system monitors key parameters in real time: ① Monitor the temperature fluctuation of the coupling water using the temperature sensor in the water immersion probe; ② The load of the drive motors of the rotating platform and the multi-degree-of-freedom scanning robot 2 is monitored by a current sensor; ③ Ensure motion positioning accuracy through encoder feedback; ④ Evaluate the validity of the test data using an ultrasonic signal quality monitoring system.

[0044] When an abnormal situation is detected, such as poor coupling, excessive motion deviation, or degraded signal quality, the system will automatically pause the detection and prompt the operator to intervene.

[0045] 4. Data Processing and Analysis The acquired ultrasound data is transmitted to the analysis system in real time via a high-speed data bus. Data processing mainly includes the following steps: The raw signal first undergoes digital filtering, employing an adaptive filter to suppress various noise interferences. Then, time-frequency analysis is used to extract signal features, and feature fusion techniques are used to enhance the defect signal. The processed data is then input into a trained deep learning model for defect identification and classification.

[0046] The system's built-in defect recognition algorithm is trained on a large amount of actual inspection data and can accurately identify typical defects such as porosity, delamination, and cracks. For each detected defect, the system automatically records its three-dimensional position coordinates, equivalent size, orientation angle, and other characteristic parameters, and judges its compliance according to preset acceptance standards.

[0047] The inspection results are displayed visually in the form of 3D images, with different colored markers representing different types of defects. The system automatically generates an inspection report containing the following: ① Basic information about the workpiece (number, material, specifications, etc.); ② Detection parameter settings; ③Defect distribution map; ④ Detailed list of defects (location, size, type, etc.); ⑤ Pass / Fail determination conclusion; ⑥ Quality assessment of the testing process.

[0048] Through the specific embodiments described above, this invention enables efficient and accurate detection of mesh-like hollow structures, meeting the quality control requirements for composite material components in fields such as aerospace. The system boasts a high degree of automation, is easy to operate, and provides reliable detection results, demonstrating significant technical advantages and practical value.

[0049] The above description is only the best specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the protection scope of the present invention.

[0050] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A mesh-hollow structure ultrasonic phased array detection system, characterized in that: It includes a rotating platform (1), a multi-degree-of-freedom scanning robot (2), a hierarchical water immersion coupling system (3), an ultrasonic phased array detection module (4), a motion control system (5), and an intelligent data analysis system (6), among which, A rotating platform (1) is used to drive the workpiece to rotate. During the rotation, the torque change is monitored in real time, and the machine is automatically stopped for protection when abnormal resistance is detected. A multi-degree-of-freedom scanning robot (2) is used to carry an ultrasonic phased array detection module (4), which can perform axial translation and spatial posture adjustment according to the control signal of the motion control system (5); A graded water immersion coupling system (3) is used to perform local water immersion on the workpiece detection area; The ultrasonic phased array detection module (4) is used to scan the water immersion detection area of ​​the workpiece; The motion control system (5) is used to generate a scanning path and optimize the trajectory and posture of the multi-degree-of-freedom scanning robot (2) based on the geometric features of the workpiece's three-dimensional model and the mesh ribs, and to send control signals to the multi-degree-of-freedom scanning robot (2). The intelligent data analysis system (6) is used to collect the scanning data of the ultrasonic phased array detection module (4) in real time, reconstruct the scanning data into a complete three-dimensional image of the workpiece, identify and label defects, and automatically generate detection results.

2. The mesh-hollow structure ultrasonic phased array detection system according to claim 1, characterized in that: The rotating platform (1) includes an automatic workpiece centering device and flexible support rollers to limit the axial movement of the workpiece during rotation, and also includes transition rollers to reduce the frictional resistance between the workpiece and the rotating platform (1).

3. The mesh-hollow structure ultrasonic phased array detection system according to claim 1, characterized in that: The multi-degree-of-freedom scanning robot (2) includes a linear conveyor and a six-degree-of-freedom robot arm. The linear conveyor is arranged along the workpiece axis, and the six-degree-of-freedom robot arm is arranged on the linear conveyor. A probe clamp is provided at the end of the six-degree-of-freedom robot arm for configuring an ultrasonic phased array detection module (4).

4. The ultrasonic phased array detection system with a mesh-like hollow structure according to claim 1, characterized in that: The graded water immersion coupling system (3) includes an inner water tank and an outer water tank. The inner water tank is used to place the detection probe of the ultrasonic phased array detection module (4) and the coupling water. The outer water tank is used to receive the water overflowing from the inner water tank and perform self-cleaning, and return the filtered water to the inner water tank.

5. The mesh-hollow structure ultrasonic phased array detection system according to claim 4, characterized in that: The temperature of the coupling water is 20±0.5℃, and the coupling water depth is H=0.2D+50mm, where D is the diameter of the workpiece.

6. The mesh-hollow structure ultrasonic phased array detection system according to claim 1, characterized in that: The intelligent data analysis system (6) automatically generates a test report after the test is completed. The test report includes basic information of the workpiece, test parameter settings, defect distribution map, detailed list of defects, qualification judgment conclusion and quality assessment of the test process. If the test result of the workpiece is unqualified, the defect location is marked in the test report.

7. The ultrasonic phased array detection system with a mesh-like hollow structure according to claim 1, characterized in that: The rotating platform (1) is provided with multiple radially adjustable support points. The radially adjustable support points are made of polyurethane. The contact state between the workpiece and the radially adjustable support points is monitored by a laser rangefinder, so that the workpiece deformation after clamping is less than 0.1 mm.

8. The ultrasonic phased array detection system with a mesh-like hollow structure according to claim 1, characterized in that: The ultrasonic phased array detection module (4) uses a phased array probe with a center frequency of 5-7.5MHz, adopts a fan-shaped scanning mode, has a scanning angle range of 40°~70°, a scanning speed of 10-20mm / s, and a focusing depth of 10-25mm.

9. A method for detecting ultrasonic phased arrays with a mesh-like hollow structure, characterized in that: The detection system according to any one of claims 1 to 8 specifically includes the following steps: (1) Initialize the detection system and then install the workpiece on the rotating platform (1); (2) Move the multi-degree-of-freedom scanning robot (2) to the starting position and immerse the detection probe of the ultrasonic phased array detection module (4) into the coupling water; (3) Start the rotating platform (1) to drive the workpiece to rotate at a set speed, and the ultrasonic phased array detection module (4) starts to collect data; (4) After each rotation cycle is completed, the motion control system (5) sends a control signal to the multi-degree-of-freedom scanning robot (2). The multi-degree-of-freedom scanning robot (2) moves along the workpiece axis according to the preset step distance. After moving to the position, it continues to perform the next cycle of rotation scanning until the entire workpiece is inspected. (5) Intelligent data analysis system (6) collects ultrasonic phased array detection module (4) scan data, reconstructs the scan data into a complete three-dimensional image of the workpiece, identifies and marks defects, and automatically generates detection results.

10. The method for detecting a mesh-hollow structure ultrasonic phased array according to claim 9, characterized in that: During the testing process, the following are monitored in real time: the temperature fluctuation of the coupling water, the load of the drive motors of the rotating platform (1) and the multi-degree-of-freedom scanning robot (2), the motion positioning accuracy, and the validity of the testing data. If an abnormality is detected, the testing is paused and the operator is prompted to intervene.

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