Device applied to AI acoustic quality inspection and suitable for clamping fans of different models and using method of device

Abstract

The invention relates to the technical field of acoustic detection, in particular to a device applied to AI acoustic quality inspection and suitable for clamping fans of different models and a using method of the device. The device comprises a manipulator, a mounting block, a mounting frame, a tool base, a detachable flexible tool and an adjustable radio support module. The flexible tool has the beneficial effects that non-rigid clamping is achieved through a rubber bandage or an elastic clamping hook, the flexible tool is matched with system fans similar in structure but different in size, the whole set of clamp does not need to be replaced, and the production line switching time and the tool cost are reduced; the radio support module is independent of the clamping structure, the position adjustment of the radio support module does not depend on the fan installation state, and it is ensured that the acoustic sensor is located at the accurately reproduced position in each detection.

Description

Technical Field

[0001] This invention relates to the field of acoustic testing technology, and in particular to a device and its method of use for AI acoustic quality inspection and applicable to clamping different types of fans. Background Technology

[0002] With the deep integration of artificial intelligence and acoustic inspection technology, AI acoustic quality inspection is playing an increasingly important role in industrial manufacturing, especially in the quality control of electronic equipment such as system fans. Current technologies typically rely on mechanical clamping devices to fix the fan under test and use multi-angle rotation in conjunction with acoustic sensors to collect operating noise for defect identification and performance evaluation. However, current clamping devices generally employ a one-to-one dedicated tooling design, adapting only to a single fan model, resulting in poor equipment compatibility and high changeover costs. Furthermore, rigid limiting structures are prone to causing indentations or deformation of the fan casing, and may even introduce additional vibrations and abnormal noises, severely affecting the purity of the acoustic signal and the accuracy of the inspection results. Therefore, there is an urgent need for a flexible clamping device suitable for multiple fan models, with low noise interference, and allowing for rapid changeover.

[0003] The existing technology, patent CN113744756B, entitled "Equipment Quality Inspection and Audio Data Enhancement Method and Related Devices, Equipment, and Media," was published on August 16, 2024. This patent proposes an equipment quality inspection method based on acoustic feature extraction and a deep learning model. By constructing sample sub-spectral graphs to train the quality inspection model, it effectively improves the efficiency and accuracy of equipment audio quality inspection. However, this solution focuses on the audio signal processing algorithm level and does not address the clamping, positioning, and attitude adjustment mechanisms of the tested equipment (such as a fan) during the physical inspection process, completely ignoring the interference of the hardware clamping structure on the acoustic environment. Especially when dealing with fans of different sizes, shapes, or installation interfaces, the lack of universal, flexible, and non-destructive clamping methods makes it difficult to guarantee the consistency and repeatability of acoustic acquisition, limiting its generalization ability in actual production lines.

[0004] Therefore, it is necessary to design a device that can be used for AI acoustic quality inspection and is suitable for clamping different types of fans to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a device applicable to AI acoustic quality inspection and suitable for clamping different types of fans, so as to overcome the above-mentioned shortcomings of the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A device for AI acoustic quality inspection and suitable for clamping different types of fans includes a tooling base, a flexible tooling that can be detachably installed on the tooling base, and a microphone bracket module that is mounted on the tooling base and has an adjustable position. Its features are: The flexible tooling includes a base plate, a cross-shaped protrusion integrally formed in the center of the base plate, multiple sets of limiting pins arranged at equal intervals along the four arms of the cross-shaped protrusion, and rubber straps respectively fixed to the four edges of the base plate. The limiting pin is a cylindrical nylon pin with an external thread at its root, which is screwed into the pre-set threaded hole on the cross-shaped protrusion. The two ends of the rubber strap are respectively inserted into the binding grooves opened in the rubber fixing blocks at the four corners of the base plate, and are clamped and fixed by pressure plates and screws.

[0007] Preferably, the tooling base is a rectangular metal plate with studs at the four corners of its upper surface. The bottom of the flexible tooling is provided with nuts corresponding to the studs. After the nuts are embedded in the studs, they are pressed and fixed by wing nuts. A power connector is embedded on one end face of the tooling base.

[0008] Preferably, the receiver bracket module includes a rotating shaft perpendicularly passing through the side of the tooling base, a bushing sleeve sleeved on the outer circumference of the rotating shaft and slidable axially, an L-shaped mounting block welded and fixed to the outer wall of the bushing sleeve, a connecting block bolted to the end of the L-shaped mounting block, and a microphone mounted on the connecting block via a quick-release clip; both ends of the rotating shaft are supported in bearing seats on the upper and lower end faces of the tooling base by deep groove ball bearings; the upper end of the rotating shaft is provided with an external thread section, which, in conjunction with a locking nut, axially limits the bushing sleeve; the outer wall of the bushing is provided with a radial threaded hole, which, in conjunction with a set screw, locks the circumferential position of the bushing on the rotating shaft.

[0009] Preferably, at least one edge of the base plate is provided with a support block, and the upper surface of the support block is provided with an auxiliary limiting pin with the same structure as the limiting pin, for supporting the bottom edge of the small system fan.

[0010] Preferably, the flexible tooling further includes a base plate, a shaft fixed vertically to the upper surface of the base plate, a connecting bracket sleeved on the shaft, a plurality of springs evenly distributed along the circumference of the connecting bracket, and hooks connected to the free ends of each spring; one end of each spring is engaged in the annular groove of the outer edge of the connecting bracket by a fixing ring, and the other end is movably connected to the hook by a hinge shaft; the hook is S-shaped, and its inner side is provided with an arc-shaped contact surface for engaging in the slot of the outer edge of the system fan housing.

[0011] A method for using a device applied to AI acoustic quality inspection and suitable for clamping different types of fans includes the following steps: S1. Select the corresponding flexible fixture according to the external dimensions and interface type of the fan of the system under test. Align the nut at the bottom of the flexible fixture with the stud on the fixture base, push it in, and tighten the wing nut to complete the installation. S2. Loosen the locking nut on the rotating shaft and the set screw on the bushing in the radio bracket module, rotate the radio around the rotating shaft to a position away from the top of the flexible tooling, and slide it upward along the rotating shaft to the highest point to reserve space for the installation of the system fan; S3. Stretch the rubber strap outwards and place the system fan on the cross-shaped protrusion, so that the bottom surface of the system fan fits against the cross-shaped protrusion and its outer edge abuts against the corresponding limiting pin; if it is a small fan, then overlap part of its bottom edge with the bearing block and be laterally constrained by the auxiliary limiting pin; then release the rubber strap so that it presses the upper surface of the system fan with its own elasticity; for fans with slots, a second type of flexible tooling is used so that each hook automatically engages in the fan slot under the action of the spring; S4. Connect the power interface of the system fan to the power connector on the side of the tooling base to complete the electrical connection; S5. Adjust the receiver bracket module. First, move the bushing downward along the rotating shaft to a predetermined height. Then, rotate the L-shaped mounting block around the rotating shaft so that the receiver is located directly in front of the system fan outlet or at a specified acquisition angle. Finally, tighten the set screw and the locking nut. S6. Start the robotic arm, which drives the entire flexible fixture and system fan to rotate along the preset trajectory. At the same time, start the sound collector to collect acoustic signals from multiple angles and complete the AI ​​acoustic quality inspection process.

[0012] Preferably, in step S3, when the second type of flexible tooling is used, the connecting bracket can float slightly on the shaft column to adapt to the slot position deviation of fans with different diameters, and the spring provides a constant preload so that the hook always fits against the inner wall of the slot without generating rigid impact.

[0013] The beneficial effects of this invention are as follows: This technical solution is compatible with system fans of various sizes and structures through modular flexible tooling design and quick replacement mechanism; it uses non-rigid contact rubber straps for fixing, avoiding indentation on the fan housing or introducing structural vibration; the radio bracket module is independent of the clamping structure, and its position adjustment does not depend on the fan installation state, ensuring that the acoustic sensor is in the accurate reproduction position in each detection; the power connector is integrated into the tooling base, realizing integrated power supply and clamping, reducing external cable interference; Flexible tooling, with its replaceable limit pin layout and elastic strap / hook structure, can adapt to system fans with similar structures but different sizes, without the need to replace the entire set of fixtures, thus reducing production line changeover time and tooling costs. Both the rubber straps and the nylon retaining pins are non-metallic flexible materials, which do not produce metallic collision sounds during contact, and the strap pressure is evenly distributed to avoid micro-deformation of the shell caused by local stress concentration. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a device for AI acoustic quality inspection and applicable to clamping different types of fans according to the present invention; Figure 2 This is a schematic diagram of a tooling base for a device of the present invention applied to AI acoustic quality inspection and suitable for clamping different types of fans; Figure 3 This is a schematic diagram of the first type of structural tooling for a device of the present invention applied to AI acoustic quality inspection and applicable to clamping different types of fans; Figure 4 This is a schematic diagram of a second type of structural tooling for a device of the present invention applied to AI acoustic quality inspection and applicable to clamping different types of fans; Figure 5 This is an assembly diagram of the first type of fan for a device of the present invention that is applied to AI acoustic quality inspection and is suitable for clamping different types of fans; Figure 6 This is an assembly diagram of a second type of fan for a device of the present invention that is applied to AI acoustic quality inspection and is suitable for clamping different types of fans; Figure 7 This is an assembly diagram of a third type of fan for an AI acoustic quality inspection device applicable to clamping different types of fans according to the present invention; In the diagram: 1. Robotic arm; 2. Mounting block; 3. Mounting bracket; 4. Tooling base; 5. Flexible tooling; 6. Radio receiver bracket module; 41. Stud; 51. Nut; 43. Power connector; 61. Shaft; 62. Bushing; 63. L-shaped mounting block; 64. Connecting block; 65. Sound collector; 5a. Type I flexible tooling; 5b. Type II flexible tooling; 52. Cross-shaped protrusion; 53. Limit pin; 54. Rubber strap; 57. Shaft column; 58. Connecting bracket; 59. Spring component; 60. Hook. Detailed Implementation

[0015] Reference Figures 1 to 7A device for AI acoustic quality inspection and suitable for clamping different types of fans includes a robotic arm 1, a mounting block 2, a mounting frame 3, a tooling base 4, a flexible tooling 5, and a microphone bracket module 6. The robotic arm 1 is a six-axis servo robotic arm with a standard flange on its end effector, which is fixedly connected to the mounting block 2 by bolts. The mounting block 2 has two locating pin holes and multiple threaded holes. The mounting frame 3 has two locating pins and matching through holes at corresponding positions on its bottom. During assembly, the locating pins are first inserted into the locating pin holes of the mounting block 2, and then screws are passed through the through holes of the mounting frame 3 and screwed into the threaded holes of the mounting block 2, thereby achieving a rigid connection between the mounting frame 3 and the mounting block 2.

[0016] The mounting bracket 3 is bolted to a rectangular metal tooling base 4. At the four corners of the upper surface of the tooling base 4, studs 41 extending laterally or longitudinally are respectively provided. The studs 41 have an inverted T-shaped cross-section and are used to fit the nuts 51 at the bottom of the flexible tooling 5. The nuts 51 of the flexible tooling 5 match the shape of the studs 41. During assembly, the nuts 51 are slid into the predetermined position along the studs 41, and then a wing nut is inserted above the studs 41. By tightening the wing nut, the pressure plate presses against the upper surface of the nuts 51, thereby fixing the flexible tooling 5 to the tooling base 4.

[0017] A power connector 43 is embedded on one end face of the fixture base 4. The power connector 43 has multiple electrode contacts inside. The electrode leads pass through the cable channel inside the fixture base 4 from the rear end of the power connector 43 and are led out from the bottom of the fixture base 4 to connect to an external power supply module to provide working power to the fan under test.

[0018] The receiver bracket module 6 is located in the central area of ​​the fixture base 4. This module includes a rotating shaft 61 that passes vertically through the side of the fixture base 4. The upper and lower ends of the rotating shaft 61 are supported by deep groove ball bearings in bearing seats on the upper and lower end faces of the fixture base 4, allowing the rotating shaft 61 to rotate freely around its own axis. A bushing 62 is fitted around the outer circumference of the rotating shaft 61, with a clearance fit between the inner hole of the bushing 62 and the outer circle of the rotating shaft 61, allowing the bushing 62 to slide axially along the rotating shaft 61. An L-shaped mounting block 63 is welded and fixed to the outer wall of the bushing 62. The vertical section of the L-shaped mounting block 63 is fixedly connected to the bushing 62, and the horizontal section has a threaded hole at its end, through which a connecting block 64 is bolted. The front end of the connecting block 64 has a quick-release buckle structure, through which the receiver 65 is mounted on the connecting block 64. The upper end of the rotating shaft 61 is machined with an external thread section, on which a locking nut is screwed. When the bushing 62 slides along the rotating shaft 61 to the required height, the locking nut is tightened so that its lower end face presses against the upper end face of the bushing 62, thereby limiting the axial displacement of the bushing 62. In addition, the outer wall of the bushing 62 is also provided with a radially penetrating threaded hole. A set screw is screwed into this threaded hole. When the L-shaped mounting block 63 rotates around the rotating shaft 61 to the required angle, the set screw is tightened so that its end presses against the outer circumferential surface of the rotating shaft 61, thereby locking the circumferential position of the bushing 62. The radio bracket module 6 uses POM damping material to isolate / decouple vibration, suppress resonance, and provide stable support.

[0019] The flexible fixture 5 described in this invention has two structural implementations, each corresponding to different types of system fans. The first type of flexible fixture 5a includes a base plate, a cross-shaped protrusion 52 integrally formed at the center of the base plate, multiple sets of limiting pins 53 evenly spaced along the four arms of the cross-shaped protrusion 52, and rubber straps 54 fixed to the four edges of the base plate. The limiting pins 53 are made of cylindrical nylon with external threads at their roots, screwed into pre-set threaded holes on the cross-shaped protrusion 52. The number and position of the limiting pins 53 can be adjusted according to the bottom contour of the fan to be tested. The rubber straps 54 are made of highly elastic silicone material, with both ends inserted into binding grooves opened in the rubber fixing blocks at the four corners of the base plate, and clamped and fixed by pressure plates and screws. This allows the rubber straps 54 to be in a relaxed state in their natural state, facilitating stretching and covering the upper surface of the fan. The base plate has a support block extending from at least one edge. The upper surface of the support block is provided with an auxiliary limit pin with the same structure as the limit pin 53, which is used to support part of the bottom edge of the small system fan and prevent it from tipping over due to the shift of the center of gravity.

[0020] The second type of flexible tooling 5b includes a base plate, a shaft 57 vertically fixed to the center of the upper surface of the base plate, a connecting bracket 58 sleeved on the shaft 57, several springs 59 evenly distributed circumferentially along the connecting bracket 58, and hooks 60 connected to the free ends of each spring 59. The shaft 57 is a metal cylinder with a stepped structure at its upper end. The inner hole of the connecting bracket 58 is fitted around the outer circumference of the shaft 57 and can float slightly axially on the shaft 57. The outer edge of the connecting bracket 58 has an annular groove. One end of the spring 59 is engaged in the annular groove by a fixing ring, and the other end is movably connected to the hook 60 by a hinge shaft. The hook 60 is S-shaped with an arc-shaped contact surface on its inner side for engaging into the slot on the outer edge of the system fan housing. The spring 59 is in a compressed state in its natural state, so that the hook 60 always applies an outward elastic force. When the fan is placed on the base plate, the hook 60 automatically engages into the fan slot under the action of the spring 59, thereby achieving circumferential constraint on the fan.

[0021] In actual operation, firstly, select the corresponding flexible fixture 5 according to the external dimensions and interface type of the fan of the system under test. If it is a standard-sized fan without a slot structure, select the first type of flexible fixture 5a; if it is a system fan with an outer edge slot, select the second type of flexible fixture 5b. After selecting the flexible fixture 5, align the nut 51 at its bottom with the stud 41 on the fixture base 4, push it along the stud 41 to the predetermined installation position, and then tighten the wing nut to firmly fix the flexible fixture 5 on the fixture base 4. Next, loosen the locking nut and set screw in the radio bracket module 6 so that the bushing 62 can slide freely along the rotating shaft 61, and the L-shaped mounting block 63 can rotate around the rotating shaft 61. At this time, rotate the microphone 65 around the rotating shaft 61 to a position away from the flexible fixture 5, and slide it upward along the rotating shaft 61 to the highest point to reserve sufficient space for subsequent fan installation.

[0022] The fan is then installed: For the first type of flexible fixture 5a, the operator stretches the rubber straps 54 on all four sides to create sufficient space, then places the system fan on the cross-shaped protrusion 52, ensuring the bottom surface of the fan fits against the cross-shaped protrusion 52 and its outer edge abuts against the corresponding limiting pin 53. For small fans, part of their bottom edge can overlap the support block 55 and be laterally restrained by the auxiliary limiting pin 56. After positioning, the rubber straps 54 are released, allowing them to retract and press against the upper surface of the fan using their own elasticity, forming a non-rigid clamping. For the second type of flexible fixture 5b, the system fan is placed on the base plate, aligning its outer edge slots with the hooks 60. Due to the constant elastic force provided by the spring 59, the hooks 60 automatically retract inward and engage in the slots after contacting them, completing circumferential fixation and achieving flexible clamping. During this process, the connecting bracket 58 can slightly float on the shaft 57 to accommodate the slot position deviations of fans with different diameters.

[0023] After the fan is installed, connect its power interface to the power connector 43 on the side of the fixture base 4 to complete the electrical connection. Then adjust the receiver bracket module 6: first, move the bushing 62 downwards along the rotating shaft 61 to the predetermined height, which is set according to the fan outlet position and the required sound collection distance; then rotate the L-shaped mounting block 63 around the rotating shaft 61 so that the receiver 65 is located directly in front of the system fan outlet or at the specified collection angle; finally, tighten the set screw and lock nut in sequence to lock the spatial position of the receiver 65. At this time, the entire device is in a ready-to-test state.

[0024] The robotic arm 1 is activated and controlled to move the mounting block 2, mounting frame 3, tooling base 4, and flexible tooling 5 along a preset trajectory, causing the clamped system fan to rotate or oscillate in space along a set path. During this process, the microphone 65 remains in a fixed position, continuously collecting acoustic signals from the fan in different postures. Since the microphone bracket module 6 is independent of the clamping structure, its position adjustment does not depend on the fan's installation state, and the robotic arm 1 uses a combination of a low-noise servo motor and a harmonic reducer, the mechanical noise generated during operation is less than 25 dB(A), which will not interfere with the acoustic acquisition. The collected acoustic signals are transmitted to the AI ​​analysis system to determine whether the fan has abnormal noise, imbalance, or other acoustic defects, completing the AI ​​acoustic quality inspection process.

[0025] Specifically, after installing the first type of flexible fixture 5a, the operator stretches the rubber straps 54 on all four sides with both hands to open them into a sufficiently large opening (e.g., an opening greater than 120 mm) to accommodate the fan under test. The square fan is then placed on the cross-shaped protrusion 52. The four arms of the cross-shaped protrusion 52 conform to the central reinforcing rib area on the bottom surface of the fan, providing basic support. Simultaneously, four sets of limiting pins 53 are pre-screwed into the four arms of the cross-shaped protrusion 52 according to the bottom edge contour of the fan model. The nylon end faces of the limiting pins 53 contact the edge of the fan's bottom shell, forming a non-rigid lateral constraint. If the object being tested is a smaller 80 mm fan, part of its bottom edge can overlap the support block 55, with auxiliary limiting pins 56 restricting its lateral displacement to prevent overturning due to a shift in the center of gravity. After the rubber strap 54 is released, the highly elastic silicone material is evenly pressed onto the surface of the fan top cover by its own rebound force, forming a three-point flexible clamping - that is, the bottom is supported by the cross-shaped protrusion 52, the side is limited by the limiting pin 53, and the top is pressed by the rubber strap 54. The three work together to achieve stable clamping, and there is no hard metal contact at all contact points, avoiding indentation or inducing structural resonance.

[0026] When switching to the second type of flexible tooling 5b for clamping a 92 mm circular centrifugal fan, the operator places the fan vertically on the base plate, aligning its outer annular groove with the three circumferentially distributed hooks 60. Since the spring 59 is in a pre-compressed state under natural conditions, the hooks 60 are radially open when not subjected to external force. During the fan's downward press, the arc-shaped contact surface of the hook 60 contacts the inner wall of the groove and contracts inward under force, further compressing the spring 59. Once the hook 60 is fully inserted into the groove, it automatically springs back and locks in place under the restoring force of the spring. The connecting bracket 58 is sleeved on the shaft 57 and can float within a ±2 mm axial range to compensate for the groove height tolerance of different batches of fans (typically ±0.5 mm), ensuring that the hooks 60 are always effectively embedded in the groove without generating over-positioning stress. This structure achieves circumferential adaptive clamping through elastic preload, eliminating the need for manual adjustment. Furthermore, the L-shaped structure and hinged design of the hook 60 allow for slight rotation during insertion, further enhancing its tolerance to slot position deviations.

[0027] After the fan is fixed, its power plug is inserted into the power connector 43 on the side of the fixture base 4. The electrode contacts are automatically connected, and the external power supply module supplies power to the fan through the internal cable channel of the fixture base 4, avoiding the risk of vibration noise or entanglement of exposed cables during the movement of the robot arm 1. Then, the operator loosens the locking nut and set screw in the receiver bracket module 6, moves the microphone 65 up to the highest position along the rotating shaft 61, and rotates the L-shaped mounting block 63 to avoid the fan installation area. After the fan is in place, the bushing 62 is moved down along the rotating shaft 61 to a distance of 50 mm from the fan outlet (this distance is set according to the acoustic near-field acquisition specifications), and the microphone 65 is aligned with the air outlet direction by rotating the L-shaped mounting block 63. At this time, the set screw is tightened so that its end is pressed against the outer circle of the rotating shaft 61 to lock the circumferential angle; then the locking nut 51 is tightened to press the upper end face of the bushing 62 to achieve axial positioning. This dual locking mechanism ensures that the position of the microphone 65 remains constant during subsequent detection, with a repeatability error of less than ±0.5°, meeting the AI ​​model's requirements for spatial consistency of acoustic signals.

[0028] After the robotic arm 1 is activated, its six-axis servo system drives the mounting block 2 to move the entire clamping unit in three-dimensional space according to the preset program. For example, it swings around the Y-axis ±30° and rotates continuously around the Z-axis 360°, simulating the multi-angle working posture of the fan in the actual equipment. During this process, the sound receiver module 6 is fixed at the center of the tooling base 4 and does not move with the robotic arm 1. The sound collector 65 remains stationary and only receives acoustic signals from the fan body. Since the robotic arm 1 uses a combination of harmonic reducer and low-noise servo motor, its measured operating noise is less than 25 dB(A), which is far lower than the normal operating noise of the fan (usually 35–50 dB(A)). Therefore, it will not be mixed with background noise to interfere with the extraction of original voiceprint features. The collected multi-angle audio data is transmitted to the back-end AI analysis system via a high-speed data line. By comparing it with the sub-spectral graph of the standard sample, it identifies whether there are defects such as bearing noise, blade imbalance, or resonance peak shift.

[0029] The advantages of this invention are that, through modular flexible tooling design and quick replacement mechanism, it is compatible with system fans of various sizes and structures; non-rigid contact rubber straps are used for fixing, avoiding indentation on the fan housing or introducing structural vibration; the radio bracket module is independent of the clamping structure, and its position adjustment does not depend on the fan installation state, ensuring that the acoustic sensor is in the accurate reproduction position in each test; the power connector is integrated into the tooling base, realizing integrated power supply and clamping, reducing interference from external cables; Flexible tooling, with its replaceable limit pin layout and elastic strap / hook structure, can adapt to system fans with similar structures but different sizes, without the need to replace the entire set of fixtures, thus reducing production line changeover time and tooling costs. Both the rubber straps and the nylon retaining pins are non-metallic flexible materials, which do not produce metallic collision sounds during contact, and the strap pressure is evenly distributed to avoid micro-deformation of the shell caused by local stress concentration.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for AI acoustic quality inspection and applicable to clamping different types of fans, comprising a tooling base, a flexible tooling detachably mounted on the tooling base, and a microphone support module mounted on the tooling base and with adjustable position, characterized in that: The flexible tooling includes a base plate, a cross-shaped protrusion integrally formed in the center of the base plate, multiple sets of limiting pins arranged at equal intervals along the four arms of the cross-shaped protrusion, and rubber straps respectively fixed to the four edges of the base plate. The limiting pin is a cylindrical nylon pin with an external thread at its root, which is screwed into the pre-set threaded hole on the cross-shaped protrusion. The two ends of the rubber strap are respectively inserted into the binding grooves opened in the rubber fixing blocks at the four corners of the base plate, and are clamped and fixed by pressure plates and screws.

2. The device for AI acoustic quality inspection and applicable to clamping different types of fans according to claim 1, characterized in that: The tooling base is a rectangular metal plate with studs at the four corners of its upper surface. The bottom of the flexible tooling is provided with nuts corresponding to the studs. The nuts are inserted into the studs and then pressed and fixed by wing nuts. A power connector is embedded on one end face of the tooling base.

3. The device for AI acoustic quality inspection and applicable to clamping different types of fans according to claim 1, characterized in that: The receiver bracket module includes a rotating shaft perpendicularly passing through the side of the tooling base, a bushing sleeve sleeved on the outer circumference of the rotating shaft and slidable axially, an L-shaped mounting block welded and fixed to the outer wall of the bushing sleeve, a connecting block bolted to the end of the L-shaped mounting block, and a microphone mounted on the connecting block via a quick-release clip; both ends of the rotating shaft are supported in bearing seats on the upper and lower end faces of the tooling base by deep groove ball bearings; the upper end of the rotating shaft is provided with an external thread section, which, in conjunction with a lock nut, axially limits the bushing sleeve; the outer wall of the bushing is provided with a radial threaded hole, which, in conjunction with a set screw, locks the circumferential position of the bushing on the rotating shaft.

4. The device for AI acoustic quality inspection and applicable to clamping different types of fans according to claim 1, characterized in that: At least one edge of the base plate is provided with a support block, and the upper surface of the support block is provided with an auxiliary limiting pin with the same structure as the limiting pin, for supporting the bottom edge of the small system fan.

5. The device for AI acoustic quality inspection and applicable to clamping different types of fans according to claim 1, characterized in that: The flexible tooling also includes a base plate, a shaft fixed vertically to the upper surface of the base plate, a connecting bracket sleeved on the shaft, a plurality of springs evenly distributed along the circumference of the connecting bracket, and hooks connected to the free ends of each spring; one end of each spring is engaged in the annular groove of the outer edge of the connecting bracket by a fixing ring, and the other end is movably connected to the hook by a hinge shaft; the hook is S-shaped and has an arc-shaped contact surface on its inner side for engaging in the slot of the outer edge of the system fan housing.

6. The method of using the device for AI acoustic quality inspection and applicable to clamping different types of fans according to claims 1-5, characterized in that: Includes the following steps: S1. Select the corresponding flexible fixture according to the external dimensions and interface type of the fan of the system under test. Align the nut at the bottom of the flexible fixture with the stud on the fixture base, push it in, and tighten the wing nut to complete the installation. S2. Loosen the locking nut on the rotating shaft and the set screw on the bushing in the radio bracket module, rotate the radio around the rotating shaft to a position away from the top of the flexible tooling, and slide it upward along the rotating shaft to the highest point to reserve space for the installation of the system fan; S3. Stretch the rubber strap outwards and place the system fan on the cross-shaped protrusion, so that the bottom surface of the system fan fits against the cross-shaped protrusion and its outer edge abuts against the corresponding limiting pin; if it is a small fan, its bottom edge is attached to the bearing block and laterally restrained by the auxiliary limiting pin; then release the rubber strap so that it presses the upper surface of the system fan with its own elasticity; for fans with slots, a second type of flexible tooling is used so that each hook automatically engages in the fan slot under the action of the spring; S4. Connect the power interface of the system fan to the power connector on the side of the tooling base to complete the electrical connection; S5. Adjust the receiver bracket module. First, move the bushing downward along the rotating shaft to a predetermined height. Then, rotate the L-shaped mounting block around the rotating shaft so that the receiver is located directly in front of the system fan outlet or at a specified acquisition angle. Finally, tighten the set screw and the locking nut. S6. Start the robotic arm, which drives the entire flexible fixture and system fan to rotate along the preset trajectory. At the same time, start the sound collector to collect acoustic signals from multiple angles and complete the AI ​​acoustic quality inspection process.

7. The method of using the device for AI acoustic quality inspection and applicable to clamping different types of fans according to claim 6, characterized in that: In step S3, when the second type of flexible tooling is used, the connecting bracket can float slightly on the shaft column to adapt to the slot position deviation of fans with different diameters. The spring provides a constant preload so that the hook always fits against the inner wall of the slot without generating rigid impact.

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