A system for detecting the running-in of a turntable body of an automobile seat

Abstract

The application discloses a kind of automobile seat turntable body running-in detection system, belong to automobile seat assembly running-in detection field, it is by constructing dynamic axial alternating load exerting and two-stage running-in detection whole-process quality control closed loop architecture, in running-in process, exerting based on reference load fluctuation with time axial alternating load, both simulate random vibration working condition in real vehicle driving, again promote ball track full circumference surface and ball surface under different load state sufficient uniform running-in, overcome the defect of local contact stress concentration under constant load, uneven running-in, and carry out synchronous load running-in detection analysis, by real-time analysis torque response convergence tendency with load change, adaptive determination running-in end point, after reaching stable running-in state, switch to empty load final inspection stage, to verify dynamic running-in quality with unloading static parameter, realize from "dynamic loading-response convergence determination-unloading final inspection" whole-process closed loop quality control.

Description

Technical Field

[0001] This invention relates to the field of automotive seat assembly break-in testing, and more specifically, to an automotive seat turntable break-in testing system. Background Technology

[0002] The car seat turntable is a core component in MPVs, commercial vehicles and other models that enables the middle row seats to rotate. It typically includes a moving plate (fixed to the seat frame) and a fixed plate (fixed to the body or slide rail). The moving plate and the fixed plate rotate relative to each other through ball bearings and ball tracks (roll tracks).

[0003] After the turntable is assembled, there are microscopic unevenness and assembly tolerances on the contact surface between the ball track and the ball. If it is installed and used directly without treatment, it may cause jamming, abnormal noise during rotation, or even affect the service life due to uneven local stress. Therefore, the turntable needs to be run-in after assembly to make the contact surface between the ball track and the ball more smooth and matched.

[0004] A search revealed that, for example, Chinese patent CN217433931U discloses a running-in machine for an automotive seat slide rail turntable, comprising a support base, an upper support plate, a fixed upper plate, and a rotating lower plate. A pneumatic pump drives a rotating spindle to rotate the lower plate, thus achieving the running-in of the turntable. However, this type of traditional running-in equipment still has the following shortcomings: Lack of load application function to simulate actual load conditions: The turntable needs to bear the weight of the seat and the occupants in actual vehicle use. If only no-load rotation is adopted for break-in, it is impossible to simulate the break-in state under actual load conditions. As a result, the turntable after no-load break-in may still rotate poorly or make abnormal noises under actual vehicle loading conditions. Lack of online detection function: Conventional break-in machines only complete the break-in action and do not monitor key detection parameters such as torque, vibration, and noise in real time during the break-in process. They cannot automatically identify break-in abnormalities, nor do they involve the determination of the end point of the break-in process or the quality inspection after break-in.

[0005] To address this, a running-in testing system for automotive seat turntables is provided, designed to achieve standardized automatic running-in of the turntables under simulated load conditions, and to perform online testing of multiple characteristic parameters during and after the running-in process, thereby improving the quality and production efficiency of the turntable products. Summary of the Invention

[0006] The purpose of this invention is to address practical technical deficiencies, and a running-in testing system for automotive seat turntables is provided.

[0007] The objective of this invention can be achieved through the following technical solution: a running-in testing system for an automotive seat turntable, comprising running-in fixtures and a running-in testing system; The break-in fixture includes a frame assembly, a positioning assembly for fixing the fixed plate on the turntable, a rotary drive assembly for driving the moving plate on the turntable to rotate relative to the fixed plate, and a load application assembly for applying an axial alternating load to the moving plate. The break-in testing system includes: The dual-stage break-in acquisition module is used to acquire the torque response sequence of the moving plate, the load detection sequence characterizing the axial alternating load application state, the angular position sequence and vibration response sequence of the moving plate in real time during the rotation of the moving plate under load. It is also used to acquire the no-load torque value of the moving plate and the gap detection value between the fixed plate and the moving plate in the unloaded state. The dynamic adjustment module is used to adjust the control amount of the rotary drive source of the moving plate and the output control amount of the controllable force source based on the real-time feedback of the torque response sequence and the load detection sequence, so that the torque response sequence is maintained within the target torque range and the actual axial alternating load output of the controllable force source follows the changes of the preset dynamic load spectrum. The multi-parameter linkage detection module is used to perform load break-in detection and analysis during the continuous application of axial alternating load. It performs time-varying response characteristic analysis on the torque response sequence and the load detection sequence to determine whether the turntable has reached a stable break-in state. Meanwhile, the torque response sequence and the angular position sequence are compared by characteristic curves, and the torque response sequence and the vibration response sequence are compared by frequency components to identify abnormal states of the moving disk during the load rotation process. It is also used to perform a final no-load test analysis when the turntable has reached a stable running-in state: after the axial alternating load is unloaded, the no-load torque value and the gap detection value are compared with the preset qualified judgment range, and the quality judgment result is output.

[0008] Furthermore, the rotary drive assembly includes a rotary drive source and a rotating spindle, the rotating spindle passing through the central hole of the rotating disk and being fixedly installed by a connecting part.

[0009] Furthermore, the load application component is disposed above the frame assembly and includes a controllable force source and a rotating force application disk. The rotating force application disk is rotatably connected to the output end of the controllable force source via a slewing bearing shaft. The bottom of the rotating force application disk is inserted and installed into the mounting holes on the moving disk via a pair of plug-in parts.

[0010] Furthermore, the controllable force source is fixedly installed on the top by a fixed frame, and a lifting plate is provided at the lower part of the fixed frame, which is slidably connected to multiple support columns of the fixed frame. The output end of the controllable force source is fixed with a connecting sleeve that is fixedly sleeved with the lifting plate, and the bottom of the connecting sleeve is rotatably installed with the slewing bearing shaft.

[0011] Furthermore, the preset dynamic load spectrum is a time-series load command based on the fluctuation of a reference load sequence with a set frequency, a set amplitude, and a set waveform. The controllable force source outputs an axial force that changes with time according to the time-series load command. The set waveform includes at least one of a sine wave, a triangular wave, or a random wave.

[0012] Furthermore, the dynamic adjustment module controls the output of the controllable force source to follow the changes in the preset dynamic load spectrum, and the control accuracy satisfies that the amplitude error of the load detection sequence relative to the preset dynamic load spectrum is ≤ ±2kg. The dynamic adjustment module controls the rotation drive source to follow the changes in the preset dynamic load spectrum, and the control accuracy satisfies that the amplitude deviation of the torque response sequence is ≤3%.

[0013] Furthermore, the process of performing time-varying response characteristic analysis on the torque response sequence and load detection sequence to determine the break-in status of the turntable is as follows: Within a preset time window, the ratio of the amplitude change of the torque response sequence to the amplitude change of the load detection sequence is calculated as the load-torque response rate. When the fluctuation range of the load-torque response rate in each of the N consecutive time windows is less than the set threshold, N≥2, it is determined that the turntable has reached a stable running-in state.

[0014] Furthermore, the specific process for identifying abnormal states of the moving disk during load rotation includes: Using the rotation angle detection sequence as a reference axis, a characteristic curve of the torque response sequence as a function of rotation angle is established. Based on the characteristic curve, the jump amplitude of the torque response sequence at each rotation angle is obtained. When the jump amplitude of the torque response sequence at any angle position is greater than the preset jump amplitude threshold, it indicates that a transient step jump has occurred, and it is determined that the turntable is stuck. Fourier transform is performed on the torque response sequence and vibration detection sequence to extract spectral features. When the torque spectrum and vibration spectrum show peak sequence amplitudes at the same frequency position, and both peak sequence amplitudes exceed the corresponding preset threshold sequence, it is determined that the turntable has structural interference.

[0015] Furthermore, the qualified judgment interval of the torque response sequence under no-load condition is a preset torque response range, and the qualified judgment interval of the assembly gap detection value is a preset axial gap tolerance range. When the no-load torque value exceeds the acceptable range and the gap detection value exceeds the axial gap tolerance range, it is determined that there is abnormal wear on the ball track of the turntable. When the no-load torque value exceeds the acceptable range while the gap detection value is within the axial gap tolerance range, it is determined that the turntable has an abnormal surface condition. When the no-load torque value is within the acceptable range but the gap detection value exceeds the axial gap tolerance range, it is determined that the turntable has an abnormal dimensional fit. Conversely, if none of the above problems exist, the turntable is deemed to have passed the final inspection.

[0016] Compared with the prior art, the advantages of this invention are: This invention applies an axial alternating load to the rotating disc during the turntable break-in process to simulate the actual vehicle load conditions. This overcomes the problem of running stiffness that occurs after no-load break-in and when loaded. The axial alternating load is a dynamic load spectrum based on the fluctuation of the reference load over time. This causes the contact stress amplitude between the balls and raceways of the turntable to continuously change during the load application process. The balls generate slight axial movement and raceway contact position migration under the dynamic changes of vertical load. This promotes more thorough and uniform break-in of the entire circumference surface of the raceway and the spherical surface of the balls under different load conditions, overcoming the problem of uneven contact surface break-in in constant load break-in. After the turntable is broken in by the dynamic alternating load, it can maintain low and stable rotational resistance in both no-load final inspection and loaded actual vehicle conditions. This effectively improves the rotational smoothness of the turntable throughout its entire life cycle.

[0017] The test is conducted in two stages: load break-in testing and analysis, and no-load final inspection and analysis. Specifically: Dynamic axial alternating load provides physical excitation for load break-in detection and analysis. Only under the condition of continuous change of load amplitude can the change trend of load-torque response rate truly reflect the micro-convergence process of the turntable break-in contact surface. Load break-in detection and analysis provides intelligent endpoint for dynamic loading. As the contact surface gradually becomes smooth and matched, the response rate tends to stabilize, thereby determining whether the turntable has reached a stable break-in state. The no-load final inspection analysis is performed after the turntable has reached a stable running-in state. The no-load torque value of the moving plate after unloading and the fit clearance value between the fixed plate and the moving plate are used to verify the quality effect of dynamic running-in. The entire running-in inspection process is closely linked to each other, and together they realize a closed loop of quality control from "dynamic loading → response convergence judgment → unloading final inspection". Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the running-in fixture of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention, which uses a positioning component to fix the turntable. Figure 3 This is a schematic diagram of the fixing structure between the rotating spindle and the rotating disk of the present invention. Figure 4 This is a schematic diagram of the structure of the present invention during the break-in process; Figure 5 This is a partial cross-sectional view of the present invention during the break-in process; Figure 6 This is a schematic diagram of the data flow of each module in the system of the present invention.

[0019] Explanation of the labels in the diagram: Frame assembly; 11. Bracket; 12. Break-in support; 13. Transverse guide rail; Turntable; 21. Fixed plate; 22. Moving plate; 221. Center hole; 222. Mounting hole; Positioning components; 41. Rotary drive assembly; 42. Rotary drive source; 43. Rotating spindle; 44. Connecting part; 5. Load application component; 51. Controllable force source; 52. Slewing bearing shaft; 53. Connecting sleeve; 54. Rotary force application plate; 55. Insertion part. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Example 1: This invention discloses a car seat turntable break-in detection system. Please refer to [link / reference]. Figures 1-5 This includes running-in fixtures and running-in testing systems; The break-in fixture includes a frame assembly 1, a positioning assembly 3 for fixing the fixed plate 21 on the turntable 2, a rotary drive assembly 4 for driving the moving plate 22 on the turntable 2 to rotate relative to the fixed plate 21, and a load application assembly 5 for applying axial alternating load to the moving plate 22. The turntable 2 of the car seat includes a moving plate 21 and a fixed plate 22, with balls and ball tracks (roll tracks) provided between the moving plate 21 and the fixed plate 22. The frame assembly 1 includes a bracket 11, transverse guide rails 13 mounted on both sides of the upper end of the bracket 11, and a break-in support 12 mounted on a pair of transverse guide rails 13. The break-in support 12 is used to support the turntable 2. The positioning assembly 3 has four positions distributed at the four corners of the break-in support 12 to fix the fixed plate 21 of the turntable 2 placed on the break-in support 12. The pair of transverse guide rails 13 can drive the turntable to move horizontally for loading and unloading. The rotary drive assembly 4 includes a rotary drive source 41 and a rotary spindle 42. The rotary spindle 42 passes through the center hole 221 of the moving disk 22 and is fixedly installed by the connecting part 23. The connecting part 23 includes two mounting flanges that are threadedly detachably fitted onto the rotating spindle 42. The lower mounting flange is first fixed to the rotating spindle 42. The turntable 2 is placed on the break-in support 12 so that the center hole 221 passes through the rotating spindle 42. Then, the other mounting flange is installed. The two mounting flanges are respectively aligned with the upper and lower end faces of the center hole 221 and fixed with bolts to complete the positioning of the turntable 22 and the rotating spindle 42.

[0022] The load application component 5 is located above the frame component 1 and includes a controllable force source 51 and a rotating force application disk 54. The rotating force application disk 54 is rotatably connected to the output end of the controllable force source 51 via a slewing bearing shaft 52. The bottom of the rotating force application disk 54 is inserted and installed into the mounting holes 222 on the moving disk 22 via a pair of plug-in parts 55. The controllable force source 51 is fixedly installed on the top of 1 by a fixed frame. The lower part of the fixed frame is provided with a lifting plate that is slidably connected to multiple support columns of the fixed frame. The output end of the controllable force source 51 is fixed with a connecting sleeve 53 that is fixedly sleeved with the lifting plate. The bottom of the connecting sleeve 53 is rotatably connected to the slewing bearing shaft 52, which makes the rotating force-applying disk 54 rotate synchronously with the moving disk 22 to ensure the separation of the static force application of the controllable force source 51 and the rotational force-applying disk 54. The axial force output by the controllable force source 51 is transmitted to the rotating force-applying disk 54 through the slewing bearing shaft 52, and then applied to the moving disk 22; while the rotational motion of the moving disk 22 is absorbed by the rolling elements of the axial slewing bearing shaft 52 and is not transmitted to the controllable force source 51.

[0023] Example 2: Please refer to Figure 6 The break-in testing system of the present invention also includes a two-stage break-in acquisition module, a dynamic adjustment module, and a multi-parameter linkage detection module: The two-stage break-in acquisition module includes multiple sensors, such as torque sensors, load sensors, angle sensors, vibration sensors, and gap sensors, for real-time acquisition of multi-dimensional detection parameters. This includes real-time acquisition of the torque response sequence of the moving disk 22, the load detection sequence characterizing the axial alternating load application state, the angular position sequence and vibration response sequence of the moving disk 22 during the rotation of the moving disk under load, and also includes acquisition of the no-load torque value of the moving disk 22 and the gap detection value between the fixed disk 21 and the moving disk 22 under the unloaded state. The dynamic adjustment module is connected to the running-in fixture and the dual-stage running-in acquisition module. It is used to adjust the control amount of the rotation drive source of the moving plate 22 and the output control amount of the controllable force source 51 based on the real-time feedback of the torque response sequence and the load detection sequence, so that the torque response sequence is maintained within the preset target range and the actual axial alternating load output of the controllable force source 51 follows the changes of the preset dynamic load spectrum. The target torque range is 10-12 N·m, which is the process target range within which the actual torque of the rotary drive source needs to be maintained during the break-in process; the preset dynamic load spectrum is a time-series load command based on the fluctuation of the reference load sequence with a set frequency, set amplitude and set waveform; the controllable force source 51 outputs the axial force that changes with time according to the time-series load command; wherein, the set waveform includes at least one of sine wave, triangular wave or random wave, and the reference load sequence is 75 kg; The dynamic adjustment module's control precision for the controllable force source 51 meets the following requirement: the amplitude error of the load detection sequence relative to the preset dynamic load spectrum is ≤2kg. The dynamic adjustment module's adjustment precision for the rotary drive source 41 ensures that the amplitude deviation of the torque response sequence is ≤3%, and the torque control precision defines the maximum permissible error of the actual torque deviating from this target range.

[0024] The multi-parameter linkage detection module, connected to the dual-stage break-in acquisition module, is used to perform load break-in detection analysis and no-load final detection analysis. The load break-in test analysis is performed during the continuous application of axial alternating load. The torque response sequence and the load test sequence are analyzed for time-varying response characteristics to determine whether the turntable has reached a stable break-in state. The specific determination is as follows: Within a preset time window, the ratio of the amplitude change of the torque response sequence to the amplitude change of the load detection sequence is calculated as the load-torque response rate. When the fluctuation range of the load-torque response rate in each of the N consecutive time windows is less than the set threshold, N≥2, it is determined that the turntable has reached a stable running-in state; otherwise, the continuous application and detection of axial alternating load will continue. During the break-in process, an axial alternating load based on the time fluctuation of the reference load is applied, causing the contact stress amplitude between the ball and the raceway to change continuously. This results in a slight axial movement of the ball and a migration of the raceway contact position, promoting full and uniform break-in of the entire circumferential surface of the raceway and the spherical surface of the ball under different load conditions. This overcomes the defects of local contact stress concentration and uneven break-in under constant load, and avoids under-break-in or over-break-in caused by differences in the initial state of the workpiece. Simultaneously, it simulates random vibration conditions during actual vehicle operation, enabling the turntable to maintain low and stable rotational resistance under both no-load final inspection and loaded actual vehicle conditions. Based on this, it uses axial alternating load as physical excitation and adaptively determines the break-in end point by analyzing the convergence trend of torque response with load changes in real time, replacing the open-loop control method with a fixed number of cycles. Meanwhile, during the continuous break-in process, the torque response sequence and the angular position sequence are compared by characteristic curves, and the torque response sequence and the vibration response sequence are compared by frequency components to identify abnormal states of the moving disc during the load rotation process. The specific process for identifying abnormal states of the moving disk during load rotation includes: Using the rotation angle detection sequence as a reference axis, a characteristic curve of the torque response sequence as a function of rotation angle is established. Based on the characteristic curve, the jump amplitude of the torque response sequence at each rotation angle is obtained. When the jump amplitude of the torque response sequence at any angle position is greater than the preset jump amplitude threshold, which is 0.3 N·m, it indicates that a transient step jump has occurred, and it is determined that the turntable is stuck. Fourier transform is performed on the torque response sequence and vibration detection sequence to extract spectral features. When the torque spectrum and vibration spectrum show peak sequence amplitudes at the same frequency position, and both peak sequence amplitudes exceed the corresponding preset thresholds, it is determined that there is structural interference on the turntable. Here, structural interference refers to periodic abnormal contact or impact caused by abnormal local contact between the ball track and the ball bearings or between the moving plate and the fixed plate. By constructing two independent anomaly detection channels, different types of mechanical faults are identified in the spatial and frequency domains, respectively: by comparing torque-angle curves, transient jumps at specific angular positions are extracted, mapping ball jamming at a certain point in the ball track (e.g., machining burrs, foreign objects), and locating the rotation angle at which the fault occurs, facilitating maintenance; while by comparing torque-vibration spectrum, synchronous peaks at the same frequency position are extracted, mapping periodic structural interference impacts (cage impact, ball collision damage), thereby identifying periodic structural interference and distinguishing random noise; The multi-parameter linkage detection module is also used to perform a final no-load test analysis when the turntable is determined to have reached a stable running-in state: after the axial alternating load is unloaded, the dynamic running-in quality is verified by the static parameters (no-load torque value and fit clearance value) after unloading. Specifically, the no-load torque value and clearance detection value are compared with the preset qualified judgment range, and the quality judgment result is output. The acceptable range for the torque response sequence under no-load conditions is the preset torque response range, preferably 10-12 N·m. The acceptable range for the assembly clearance detection value is the preset axial clearance tolerance range. When the no-load torque value exceeds the acceptable range and the gap detection value exceeds the axial gap tolerance range, it is determined that there is abnormal wear on the ball track of the turntable. When the no-load torque value exceeds the acceptable range while the gap detection value is within the axial gap tolerance range, it is determined that the turntable has an abnormal surface condition. When the no-load torque value is within the acceptable range but the clearance detection value exceeds the axial clearance tolerance range, it is determined that the turntable has an abnormal dimensional fit. Conversely, if none of the above problems exist, the turntable is deemed to have passed the final inspection.

[0025] This application involves multiple types of thresholds, set values, and judgment conditions, all of which are pre-set process parameters and judgment conditions. These are flexibly set and adjusted according to the actual process requirements such as the turntable's model specifications, material characteristics, surface treatment process, assembly accuracy level, design service life requirements, and production cycle time. They can also be adapted to meet the needs of various production scenarios by modifying them according to the quality standards and process specifications of different products.

[0026] The above are merely preferred embodiments of the present invention; however, 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 technical scope disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A system for detecting the break-in period of an automotive seat turntable, characterized in that: This includes break-in fixtures and break-in testing systems; The break-in fixture includes a frame assembly (1), a positioning assembly (3) for fixing the fixed plate (21) on the turntable (2), a rotary drive assembly (4) for driving the moving plate (22) on the turntable (2) to rotate relative to the fixed plate (21), and a load application assembly (5) for applying an axial alternating load to the moving plate (22). The break-in testing system includes: The dual-stage break-in acquisition module is used to acquire the torque response sequence of the moving disk (22), the load detection sequence characterizing the axial alternating load application state, the angular position sequence and vibration response sequence of the moving disk (22) in real time during the rotation of the moving disk (22) under load. It is also used to acquire the no-load torque value of the moving disk (22) and the gap detection value between the fixed disk (21) and the moving disk (22) under the unloaded state. The dynamic adjustment module is used to adjust the rotation drive source control quantity of the moving plate (22) and the output control quantity of the controllable force source (51) according to the real-time feedback of the torque response sequence and the load detection sequence, so that the torque response sequence is maintained within the target torque range and the actual axial alternating load output of the controllable force source (51) follows the preset dynamic load spectrum. The multi-parameter linkage detection module is used to perform load break-in detection and analysis during the continuous application of axial alternating load. It performs time-varying response characteristic analysis on the torque response sequence and the load detection sequence to determine whether the turntable has reached a stable break-in state. Meanwhile, the torque response sequence and the angular position sequence are compared by characteristic curves, and the torque response sequence and the vibration response sequence are compared by frequency components to identify abnormal states of the moving disk during the load rotation process. It is also used to perform no-load final inspection analysis when the turntable is determined to have reached a stable running-in state: after the axial alternating load is unloaded, the no-load torque value and the gap detection value are compared with the preset qualified judgment range, and the quality judgment result is output.

2. The automotive seat turntable break-in testing system according to claim 1, characterized in that: The rotary drive assembly (4) includes a rotary drive source (41) and a rotary spindle (42), the rotary spindle (42) passing through the center hole (221) of the moving disk (22) and being fixedly installed by the connecting part (23).

3. The automotive seat turntable break-in testing system according to claim 1, characterized in that: The load application component (5) is located above the frame assembly (1) and includes a controllable force source (51) and a rotating force application disk (54). The rotating force application disk (54) is rotatably connected to the output end of the controllable force source (51) via a slewing bearing shaft (52). The bottom of the rotating force application disk (54) is inserted and installed into the mounting holes (222) on the moving disk (22) via a pair of plug-in parts (55).

4. The automotive seat turntable break-in testing system according to claim 3, characterized in that: The controllable force source (51) is fixedly installed on the top of the frame assembly (1) by a fixed frame. A lifting plate is provided at the bottom of the fixed frame and is slidably connected to multiple support columns of the fixed frame. The output end of the controllable force source (51) is fixed with a connecting sleeve (53) that is fixedly sleeved with the lifting plate. The bottom of the connecting sleeve (53) is rotatably installed with the slewing bearing shaft (52).

5. The automotive seat turntable break-in testing system according to claim 4, characterized in that: The preset dynamic load spectrum is a time-series load command based on the fluctuation of a reference load sequence with a set frequency, set amplitude and set waveform. The controllable force source (51) outputs an axial force that changes with time according to the time-series load command. The set waveform includes at least one of a sine wave, a triangular wave or a random wave.

6. The automotive seat turntable break-in testing system according to claim 1, characterized in that: The process of performing time-varying response characteristic analysis on the torque response sequence and load detection sequence to determine the break-in status of the turntable is as follows: Within a preset time window, the ratio of the amplitude change of the torque response sequence to the amplitude change of the load detection sequence is calculated as the load-torque response rate. When the fluctuation range of the load-torque response rate in each of the N consecutive time windows is less than the set threshold, N≥2, it is determined that the turntable has reached a stable running-in state.

7. The automotive seat turntable break-in testing system according to claim 6, characterized in that: The specific process for identifying abnormal states of the moving disk during load rotation includes: Using the rotation angle detection sequence as a reference axis, a characteristic curve of the torque response sequence as a function of rotation angle is established. Based on the characteristic curve, the jump amplitude of the torque response sequence at each rotation angle is obtained. When the jump amplitude of the torque response sequence at any angle position is greater than the preset jump amplitude threshold, it indicates that a transient step jump has occurred, and it is determined that the turntable is stuck. Fourier transform is performed on the torque response sequence and vibration detection sequence to extract spectral features. When the torque spectrum and vibration spectrum show peak sequence amplitudes at the same frequency position, and both peak sequence amplitudes exceed the corresponding preset threshold sequence, it is determined that the turntable has structural interference.

8. The automotive seat turntable break-in testing system according to claim 7, characterized in that: The qualified judgment interval of the torque response sequence under no-load condition is a preset torque response range, and the qualified judgment interval of the assembly gap detection value is a preset axial gap tolerance range. When the no-load torque value exceeds the acceptable range and the gap detection value exceeds the axial gap tolerance range, it is determined that there is abnormal wear on the ball track of the turntable. When the no-load torque value exceeds the acceptable range while the gap detection value is within the axial gap tolerance range, it indicates that the surface of the turntable is in an abnormal condition. When the no-load torque value is within the acceptable range but the gap detection value exceeds the axial gap tolerance range, it is determined that the turntable has an abnormal dimensional fit. Conversely, if none of the above problems exist, the turntable is deemed to have passed the final inspection.

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