A high and low temperature alternating sun visor assembly fatigue test system

Abstract

The application relates to the technical field of sunshields and discloses a high-low temperature alternating sunshield assembly anti-fatigue test system which comprises a sealed cabin body, cabinet doors are symmetrically hinged and installed at the front and back ends of the sealed cabin body, an air duct plate is installed at the upper end of the sealed cabin body, air cavities are symmetrically preset in the air duct plate, a baffle is symmetrically installed on the inner wall of the sealed cabin body, and a plurality of rectangular sunshield bodies are evenly distributed below the baffle. The high-low temperature alternating sunshield assembly anti-fatigue test system can effectively solve the two defects of the sunshield test system in the prior art, that is, the sunshield test system cannot simultaneously perform high-low temperature alternating and turnover load test, and is mostly used for normal temperature / constant temperature test schemes, and the schemes have a large deviation from the real vehicle working condition; and the sunshield test system only supports single X-axis direction turnover and cannot simulate Y-axis direction turnover and composite operations such as pulling, so that the anti-fatigue performance cannot be objectively evaluated.

Description

Technical Field

[0001] This invention relates to the field of sunshade technology, specifically to a fatigue testing system for a high and low temperature alternating sunshade assembly. Background Technology

[0002] The sun visor assembly is an interior functional component installed at the front of the vehicle's roof, consisting of a panel, an L-shaped pivot, a support bracket, and hooks. The sun visor can typically flip up and down around the X-axis and sideways around the Y-axis, and can be hovered at any position thanks to the frictional damping between the L-shaped pivot and the support bracket. In actual use, the sun visor's temperature inside the vehicle increases dramatically after being exposed to the sun in summer, and drops sharply in winter. It also experiences multiple temperature cycles during daily day and night, and must withstand repeated flipping operations by the driver during driving. Therefore, its flipping durability under alternating high and low temperatures is a core reliability indicator.

[0003] In response, this application designs a fatigue testing system for sun visor assemblies subjected to alternating high and low temperatures. Existing testing systems for sun visors have the following drawbacks: First, they cannot simultaneously test alternating high and low temperatures and dynamic torsional loads. Most systems use methods such as testing at room temperature after environmental aging or testing in a constant temperature range, which cannot simulate the real working conditions of simultaneously bearing torsional loads during dynamic temperature changes. This results in a large deviation between the fatigue life and failure modes obtained from the test and the actual situation in the vehicle. Second, most systems can only complete torsional tests in the single X-axis direction, and cannot simulate the asymmetric compound operations such as torsional and pull-out operations along the Y-axis direction during actual use by the driver. It is difficult to objectively evaluate the fatigue performance of the sun visor assembly under complex real working conditions. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a high and low temperature alternating sun visor assembly fatigue testing system. This system effectively solves two major deficiencies in existing sun visor testing systems: firstly, it cannot simultaneously perform high and low temperature alternating and flipping load tests, and mostly adopts room temperature / constant temperature testing schemes, resulting in a large deviation from actual vehicle operating conditions; secondly, it only supports flipping in a single X-axis direction and cannot simulate combined operations such as flipping and pulling in the Y-axis direction, making it difficult to objectively evaluate its fatigue resistance performance.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a fatigue testing system for a high and low temperature alternating sunshade assembly, comprising: The sealed chamber has cabinet doors that are symmetrically hinged at both the front and rear ends. An air duct plate is installed on the upper end of the sealed chamber. Air cavities are symmetrically pre-set inside the air duct plate. Partitions are symmetrically installed on the upper and lower walls of the sealed chamber. Several rectangular sunshade bodies are placed below the partitions. Fixing parts are provided on the partitions. A flip test part is provided on both the sealed chamber and the partitions. Among them, electric heating tubes are installed on the corresponding partitions on the inner walls of the left and right ends of the sealed chamber. There are several electric heating tubes installed, two of which are symmetrically distributed vertically, and the remaining two are symmetrically distributed front and back. The flip test section includes several vents located at the upper end of the partition. These vents are evenly distributed in a rectangular shape. The upper end of the partition also has an installation groove, which consists of two circular grooves on the left and right and a rectangular groove. The circular grooves have symmetrical clearance grooves on the front and back. The clearance grooves are rectangular in design and are connected to the corresponding vents. The installation groove is equipped with an alignment group, and the sealed chamber and the alignment group are jointly equipped with the flip test group.

[0006] Furthermore, the sunshade body is composed of a panel, an L-shaped pivot, a support seat, and a hook. The vertical section of the L-shaped pivot rotates through the support seat. A short shaft is integrally installed on the upper end of the panel corresponding to the hook through a notch. A connecting shaft is rotatably installed on the upper end of the panel away from the short shaft through a round hole. The connecting shaft is rotatably connected to the horizontal section of the L-shaped pivot.

[0007] Furthermore, the fixing part includes a fixing group located at the lower end of the partition. Several fixing groups are provided, and the several fixing groups are evenly distributed in a rectangle. The fixing group includes a mounting seat 1 and a mounting seat 2 respectively installed at the lower end of the partition. Mounting seat 1 is located on the inner side of the partition, and mounting seat 2 is located on the outer side of the partition. The upper end of the support shaft is fixedly connected to mounting seat 1. The lower end of the mounting seat has a clearance hole corresponding to the L-shaped rotating shaft. The upper end of the hook is fixedly connected to mounting seat 2.

[0008] Furthermore, the flipping test section also includes a limiting hole opened on the inner wall of the lower end of the mounting groove. Several limiting holes are opened, and the limiting holes are evenly distributed in a rectangular shape. The limiting holes on the left and right sides are designed to face opposite directions. The limiting hole is composed of a longitudinal section, an arc-shaped section and a transverse section. A support slide rod is slidably installed on the inner wall of the longitudinal section of the limiting hole. An electric gripper for automatically clamping the sunshade body is installed at the lower end of the support slide rod.

[0009] Furthermore, the alignment assembly includes support columns that are symmetrically rotated and installed on the inner wall of the mounting groove. Gear disks are fixedly fitted onto the outer walls of the two support columns, staggered vertically. Only a semi-circular area on the outer wall of the gear disk has a tooth structure, while the other semi-circular area has a smooth wall structure. The two gear disks are symmetrically arranged. Mating holes are provided on both the front and rear sides of the upper end of the gear disk. The mating holes consist of short arc segments, long arc segments, and straight segments. The outlet of the straight segment is connected to the mounting groove. The short arc segments on the front and rear mating holes are evenly distributed around the circumference. The short arc segments and long arc segments on the front and rear mating holes are both symmetrically designed.

[0010] Furthermore, the alignment assembly also includes transmission gears mounted on the inner wall of the lower end of the rectangular groove of the mounting slot, located on the front and rear sides respectively. The transmission gears have a stepped shaft structure, and the front and rear transmission gears are arranged in opposite directions, with the front transmission gear meshing with the right gear disk and the rear transmission gear meshing with the left gear disk.

[0011] Furthermore, the flipping test group includes several waist-shaped grooves located at the upper end of the partition. These waist-shaped grooves are evenly distributed in a rectangular shape. Magnetic push plates are symmetrically slidably installed on the upper end of the partition. Sliding shafts are symmetrically installed at the lower end of the magnetic push plates. The outer wall of the sliding shafts is slidably connected to the inner wall of the corresponding waist-shaped groove. Waist-shaped sliding holes are symmetrically opened at the upper end of the magnetic push plates. Waist-shaped limiting grooves are opened on the inner wall of the waist-shaped sliding holes. Magnetic sliding sleeves are fixedly sleeved on the upper side of the outer wall of the support sliding rod. The outer wall of the magnetic sliding sleeves is slidably connected to the inner wall of the waist-shaped limiting grooves.

[0012] Furthermore, the flip test group also includes bidirectional lead screws that are symmetrically rotated and installed on the outer walls of the left and right ends of the sealed chamber. The left and right threaded sections on the bidirectional lead screws are designed with opposite directions of rotation. The left and right magnetic push plates on the same partition are respectively threaded to the left and right threaded sections on the corresponding bidirectional lead screws. The left ends of the upper and lower bidirectional lead screws are connected by a transmission belt. A servo motor for driving the upper bidirectional lead screw to rotate is installed on the left end of the sealed chamber.

[0013] Furthermore, the flip test section also includes a drive shaft that is symmetrically installed through the sealed chamber, the air duct plate, and the upper and lower partitions. Several drive gears are fixedly sleeved on the outer wall of the corresponding drive shaft. A servo motor for driving the corresponding drive shaft to rotate is symmetrically installed at the upper end of the air duct plate.

[0014] Furthermore, fans are installed through the upper part of the air duct plate corresponding to the left and right air cavities. Cold air pipes are symmetrically installed at the front and back of the right end of the air duct plate, and the cold air pipes are connected to the corresponding air cavities. Several waist-shaped vents are opened at the lower end of the air duct plate corresponding to the left and right air cavities in a linear and uniform distribution. Several circular air holes are opened at the upper end of the sealed chamber corresponding to the left and right air cavities in a rectangular array in a uniform distribution.

[0015] The technical solution provided by this invention has the following advantages compared with the prior art: This invention provides a fatigue testing system for a high and low temperature alternating sunshade assembly. During the high and low temperature alternating environment construction phase, when the cooling program is executed, the cold air pipe delivers refrigerant to the symmetrically preset air cavities on the left and right sides of the air duct plate. The cold air is evenly blown into the sealed chamber through the waist-shaped vent at the lower end of the air duct plate and the circular air hole at the upper end of the sealed chamber. After passing through the vent on the partition plate, it flows evenly through the test area of ​​each sunshade body and then flows back, forming a complete circulating air duct to quickly reduce the temperature inside the chamber. When the heating program is executed, multiple sets of symmetrically distributed electric heating tubes radiate heat into the chamber from multiple directions, evenly raising the temperature inside the chamber through radiation and convection. During the temperature holding and change phases, the fan runs continuously, forcing air circulation. The symmetrical arrangement of heating elements and the uniform airflow design of the duct plate ensures a high degree of uniformity of the temperature field within the sealed chamber, solving the problems of large temperature gradients and uncontrollable temperature change rates in traditional test chambers. This avoids local overcooling or overheating, enabling precise construction and dynamic control of the high and low temperature alternating environment, and providing reliable environmental conditions for subsequent dynamic flip-load testing during high and low temperature alternation.

[0016] During the fatigue test of the flip-pull displacement, after the electric gripper precisely clamps the sunshade body, the servo motor drives the bidirectional lead screw to rotate, causing the two magnetic push plates on the same layer to move back and forth. The sliding shaft at the lower end of the magnetic push plate performs adaptive sliding compensation along the corresponding waist-shaped sliding groove. With the precise limiting and cooperation of the limiting hole, the mating hole and the waist-shaped sliding hole, the support slide rod drives the corresponding sunshade body to complete the Y-axis lateral flip test and axial pull displacement test in sequence through the electric gripper. The sliding stroke of the magnetic push plate can be adjusted in real time to realize the dynamic changes of the Y-axis flip speed frequency, flip angle and pull displacement speed and pull stroke. By combining the fixing part and the flipping test part, the simultaneous application of high and low temperature alternating environment and Y-axis flipping and pull-out combined load can be realized. This mainly makes up for the shortcoming of conventional flipping test equipment, which can only perform single axial flipping. Relying on the precise guidance of the arc section and lateral section of the limiting hole, the Y-axis flipping and axial pull-out displacement can be combined and automatically switched in the same continuous process. This realistically simulates the asymmetric combined operation of the driver flipping the sun visor to the side and pulling it out at the same time, providing a test scheme that is closer to the actual vehicle use conditions for a comprehensive evaluation of the fatigue resistance of the sun visor body. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1This is a schematic diagram of the three-dimensional structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of a partial three-dimensional cross-section in an embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of the partition and the flipping test section in an embodiment of the present invention; Figure 4 This is a schematic diagram of the three-dimensional separation of the partition and the flipping test section in an embodiment of the present invention; Figure 5 This is a schematic diagram of a partial three-dimensional cross-section of the magnetic push plate in an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the partition, sunshade body, and fixing part in an embodiment of the present invention; Figure 7 For the present invention Figure 6 A magnified structural diagram of section X in the middle; Figure 8 This is a three-dimensional structural diagram of the supporting slide bar, electric gripper, and alignment assembly in an embodiment of the present invention; Figure 9 This is a schematic diagram of a partial three-dimensional cross-section of the sealed chamber and the air duct plate in an embodiment of the present invention; Figure 10 This is a schematic diagram of the three-dimensional separation of the sealed chamber and the air duct plate in an embodiment of the present invention; Figure 11 This is a schematic diagram of the three-dimensional separation of the sunshade body in an embodiment of the present invention; Figure 12 This is a three-dimensional working state structural diagram of the flipping test unit controlling the sunshade body to flip laterally in an embodiment of the present invention; Figure 13 This is a three-dimensional working state structural diagram of the sunshade body when the flipping test unit controls the axial pulling displacement of the sunshade body in an embodiment of the present invention.

[0019] The labels in the diagram represent: 1. Sealed chamber; 11. Heating element; 2. Air duct plate; 21. Fan; 22. Air conditioning pipe; 3. Partition; 4. Sunshade body; 41. Panel; 42. L-shaped pivot; 43. Support shaft; 44. Hook; 45. Short shaft; 46. Connecting shaft; 5. Fixing part; 51. Mounting seat one; 52. Mounting seat two; 6. Tilting test part; 61. Vent hole; 62. Mounting groove; 63. Limiting hole; 64. 65. Support slide bar; 66. Electric gripper; 67. Alignment assembly; 68. Support column; 69. Gear disk; 60. Mating hole; 61. Transmission gear; 62. Tilting test assembly; 63. Waist-shaped slide groove; 64. Magnetic push plate; 65. Waist-shaped sliding hole; 66. Waist-shaped limiting groove; 67. Magnetic sliding sleeve; 68. Bidirectional lead screw; 69. Servo motor one; 60. Slide shaft; 61. Transmission shaft; 62. Servo motor two. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. 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] The present invention will be further described below with reference to embodiments.

[0022] Example: Please see Figures 1-13 This invention provides a technical solution: a fatigue testing system for a high and low temperature alternating sunshade assembly, comprising: The sealed chamber 1 has cabinet doors that are symmetrically hinged at both ends. The upper end of the sealed chamber 1 is equipped with an air duct plate 2. The air duct plate 2 has air chambers that are symmetrically pre-set inside. The inner wall of the sealed chamber 1 is symmetrically equipped with partitions 3. Several rectangular sunshade bodies 4 are placed below the partitions 3. The partitions 3 are equipped with fixing parts 5. The sealed chamber 1 and the partitions 3 are both equipped with a flip test part 6. Among them, electric heating tubes 11 are installed on the inner walls of the left and right ends of the sealed chamber 1, corresponding to the partitions 3. Several electric heating tubes 11 are installed, with two electric heating tubes 11 distributed symmetrically up and down, and the remaining two electric heating tubes 11 distributed symmetrically front and back. The flip test section 6 includes a ventilation hole 61 located at the upper end of the partition 3. Several ventilation holes 61 are provided and are evenly distributed in a rectangular shape. The upper end of the partition 3 is also provided with an installation groove 62, which consists of two circular grooves on the left and right and a rectangular groove. The circular grooves are symmetrically provided with clearance grooves, which are rectangular in design and connected to the corresponding ventilation holes 61. The installation groove 62 is provided with an alignment group 66, and the sealed chamber 1 and the alignment group 66 are jointly provided with a flip test group 67.

[0023] The sunshade body 4 is composed of a panel 41, an L-shaped rotating shaft 42, a support 43, and a hook 44. The vertical section of the L-shaped rotating shaft 42 rotates through the support 43. A short shaft 45 is integrally installed on the upper end of the panel 41 corresponding to the hook 44 through a notch. A connecting shaft 46 is rotatably installed on the side of the upper end of the panel 41 away from the short shaft 45 through a round hole. The connecting shaft 46 is rotatably connected to the horizontal section of the L-shaped rotating shaft 42.

[0024] The fixing part 5 includes a fixing group located at the lower end of the partition 3. Several fixing groups are provided and are evenly distributed in a rectangular shape. The fixing group includes a first mounting seat 51 and a second mounting seat 52 respectively installed at the lower end of the partition 3. The first mounting seat 51 is located inside the partition 3, and the second mounting seat 52 is located outside the partition 3. The upper end of the support shaft seat 43 is fixedly connected to the first mounting seat 51. The lower end of the first mounting seat 51 has a clearance hole corresponding to the L-shaped rotating shaft 42. The upper end of the hook 44 is fixedly connected to the second mounting seat 52.

[0025] The flip test section 6 also includes a limiting hole 63 opened on the inner wall of the lower end of the mounting groove 62. Several limiting holes 63 are opened, and the several limiting holes 63 are evenly distributed in a rectangle. The limiting holes 63 on the left and right sides are designed to face opposite directions. The limiting hole 63 is composed of a longitudinal section, an arc section and a transverse section. A support slide rod 64 is slidably installed on the inner wall of the longitudinal section of the limiting hole 63. An electric gripper 65 for automatically clamping the sunshade body 4 is installed at the lower end of the support slide rod 64.

[0026] The alignment assembly 66 includes support columns 661 that are symmetrically rotated and installed on the inner wall of the mounting groove 62. Gear disks 662 are fixedly fitted onto the outer walls of the two support columns 661 in an alternating manner. Only a semi-circular area on the outer wall of the gear disk 662 has a tooth structure, while the other semi-circular area has a smooth wall structure. The two gear disks 662 are symmetrically arranged. The upper end of the gear disk 662 has mating holes 663 on both the front and rear sides. The mating holes 663 are composed of short arc segments, long arc segments, and straight segments. The outlet of the straight segment is connected to the mounting groove 62. The short arc segments on the two mating holes 663 are evenly distributed around the circumference. The short arc segments and long arc segments on the two mating holes 663 are symmetrically designed.

[0027] The alignment group 66 also includes transmission gears 664 rotatably mounted on the inner wall of the lower end of the rectangular groove of the mounting groove 62 on the front and rear sides respectively. The transmission gears 664 have a stepped shaft structure, and the front and rear transmission gears 664 are arranged in opposite directions. The front transmission gear 664 meshes with the right gear disk 662, and the rear transmission gear 664 meshes with the left gear disk 662.

[0028] The flip test group 67 includes a waist-shaped groove 671 opened at the upper end of the partition 3. Several waist-shaped grooves 671 are opened and are evenly distributed in a rectangular shape. Magnetic push plates 672 are symmetrically slidably installed on the upper end of the partition 3. Sliding shafts 678 are symmetrically installed at the lower end of the magnetic push plates 672. The outer wall of the sliding shafts 678 is slidably connected to the inner wall of the corresponding waist-shaped groove 671. Waist-shaped sliding holes 673 are symmetrically opened at the upper end of the magnetic push plates 672. Waist-shaped limiting grooves 674 are opened on the inner wall of the waist-shaped sliding holes 673. Magnetic sleeves 675 are fixedly sleeved on the upper side of the outer wall of the support rod 64. The outer wall of the magnetic sleeves 675 is slidably connected to the inner wall of the waist-shaped limiting grooves 674.

[0029] The flip test group 67 also includes bidirectional lead screws 676 that are symmetrically rotated and installed on the outer walls of the left and right ends of the sealed chamber 1. The left and right threaded sections of the bidirectional lead screws 676 are designed with opposite directions of rotation. The left and right magnetic push plates 672 located on the same partition 3 are respectively threaded to the left and right threaded sections of the corresponding bidirectional lead screws 676. The left ends of the upper and lower bidirectional lead screws 676 are connected by a transmission belt. A servo motor 677 for driving the upper bidirectional lead screw 676 to rotate is installed on the left end of the sealed chamber 1.

[0030] The flip test unit 6 also includes a drive shaft 68 that is symmetrically installed through the sealed chamber 1, the air duct plate 2 and the upper and lower partition plates 3. Several drive gears 664 are respectively fixedly sleeved on the outer wall of the corresponding drive shaft 68. The upper end of the air duct plate 2 is symmetrically installed with a servo motor 69 for driving the corresponding drive shaft 68 to rotate.

[0031] Fans 21 are installed through the upper end of the air duct plate 2 corresponding to the left and right air cavities. Cooling pipes 22 are symmetrically installed at the front and back of the right end of the air duct plate 2. The cooling pipes 22 are connected to the corresponding air cavities. Several waist-shaped vents are opened at the lower end of the air duct plate 2 corresponding to the left and right air cavities in a linear and uniform distribution. Several circular air holes are opened at the upper end of the sealed chamber 1 corresponding to the left and right air cavities in a rectangular array in a uniform distribution.

[0032] In practice: First, the sealed chamber 1, air duct plate 2, cooling pipe 22, heating element 11, and fan 21 in this application work together to provide a dynamically changing high and low temperature environment for the fatigue testing of the sunshade body 4. Through the cooperation of the fixing part 5 and the flipping test part 6, combined with the closed-loop temperature-changing cycle structure constructed by the sealed chamber 1 and air duct plate 2, this effectively compensates for the shortcomings of conventional sunshade body 4 testing equipment, which lacks Y-axis lateral flipping fatigue testing and shaft pull-out durability testing. Simultaneously, the longitudinal section structure of the limiting hole 63 adapts to the precise clamping of sunshade bodies 4 of different specifications, avoiding the fatigue life deviation caused by asynchronous environmental loads and dynamic loads, and the single X-axis flipping test condition in traditional sunshade body 4 fatigue testing methods. To address the issues of large discrepancies and failure modes not matching the actual vehicle, a simple reciprocating push mechanism can be used to perform a composite test of the X-axis reciprocating flipping of the sun visor body 4. This external mechanism operates independently of the testing equipment and does not interfere with the Y-axis lateral flipping and pull-out test actions of the flipping test section 6 in this application, and can be performed synchronously (there is sufficient space below the partition 3 between several sun visor bodies 4, so it will not interfere with the various components in this testing equipment). The core protection of this application is the Y-axis lateral flipping and rotating shaft pull-out test structure, as well as the coupled test scheme under high and low temperature alternating environment. The X-axis up-and-down flipping is only an expandable supporting function, and it can be implemented with existing technology, so it will not be described in this application.

[0033] The fixing unit 5 simulates the actual vehicle installation environment, providing standardized installation and fixing constraints for the sun visor body 4. This replicates the actual installation state of the vehicle roof, preventing misalignment from causing distortion of the shaft's stress conditions and ensuring that the fit of the sun visor body 4 is consistent with the actual vehicle throughout the testing cycle. The flipping test unit 6 drives the sun visor body 4 to perform a combined action simulating actual use: lateral flipping along the Y-axis and axial pulling along the shaft. Combined with the dynamic high and low temperature alternating environment inside the sealed chamber 1, this allows for precise fatigue durability testing of the sun visor body 4, achieving fully automated testing. Throughout the testing process, high-precision external sensors continuously collect and transmit data to the control system, enabling real-time online monitoring and recording of core parameters such as friction torque and hovering ability of various components of the sun visor body 4.

[0034] Furthermore, this application enables continuous, multi-dimensional fatigue testing actions. The motion trajectories of multiple actions are switched entirely through the alignment group 66. Without interrupting high or low temperature environments or disassembling samples, it can sequentially complete the full-motion tests of vertical flipping, lateral flipping, and shaft pulling, fully replicating the diverse operating procedures in daily driver use. It is worth emphasizing that the clamping constraint method of the fixing part 5 on the sun visor body 4 remains consistent throughout all test actions, replicating the rigid installation fit of the actual vehicle. The rigid connection between mounting seat 1 51 and mounting seat 2 52 replicates the installation constraint of the actual vehicle. During the test, the fixing part 5 remains stationary, with only the flipping test part 6 applying dynamic loads. The servo motor 677 at the left end of the sealed chamber 1, in conjunction with the bidirectional lead screw 676, drives the magnetic push plate 672 to reciprocate axially, providing a stable linear driving force for the Y-axis flipping and pulling tests. This ensures that the motion parameters of all stations are synchronized and consistent, providing a unified load benchmark for parallel testing of multiple samples. It is worth emphasizing that the magnetic attraction structure of the magnetic push plate 672 and the magnetic sliding sleeve 675 can provide a stable driving force while adapting to the positional changes of the support slide rod 64, avoiding motion interference, and ensuring smooth and reliable power transmission under different trajectories.

[0035] The support slide rod 64 has three layers of holes in a vertical direction: from top to bottom, the waist-shaped sliding hole 673 on the magnetic push plate 672, the mating hole 663 on the gear disk 662, and the limiting hole 63 on the partition plate 3. The rotation of the gear disk 662 enables the alignment and switching of different hole sections, and the horizontal movement of the magnetic push plate 672 provides the driving force. With the adaptive sliding of the magnetic sleeve 675 in the waist-shaped limiting groove 674, the support slide rod 64 moves smoothly along the trajectory of the limiting hole 63 without structural interference or jamming. The curvature center of the arc section of the limiting hole 63 and the long arc section of the mating hole 663 are consistent, ensuring the coaxiality of the flipping motion. The horizontal section of the limiting hole 63, the straight section of the mating hole 663, and the length direction of the waist-shaped sliding hole 673 remain parallel during the pulling stage, ensuring the smoothness of the straight pulling action.

[0036] It should also be noted that the alignment group 66 plays a crucial role in power switching and motion guidance throughout the entire testing process. The intermittent rotation of the meshing transmission between the gear disk 662 and the transmission gear 664, through the special trajectory of the mating hole 663, converts the rotational motion into selective displacement of the support slide rod 64 within the limiting hole 63. When the support slide rod 64 slides within the longitudinal section of the limiting hole 63, it will drive the electric gripper 65 to move synchronously along the longitudinal section until the electric gripper 65 reaches the intersection of the longitudinal section and the arc section. When the confluence is directly opposite the center of the plate 41, the electric gripper 65 automatically closes and clamps the plate 41. When the support slide rod 64 slides further within the arc-shaped section of the limiting hole 63, the electric gripper 65 drives the plate 41 to rotate laterally around the vertical section of the L-shaped rotating shaft 42. When sliding in the transverse section, a pull-out displacement along the axial direction of the L-shaped rotating shaft 42 will be generated simultaneously. This process is completely determined by the phase of the gear disk 662 and the stroke of the magnetic push plate 672, without the need for additional reversing actuators, making the structure compact and reliable.

[0037] In addition, the electric heating tube 11 can provide radiant heating from multiple directions inside the cabin, ensuring rapid temperature rise under high-temperature conditions; the cold air delivered by the cold air pipe 22 is homogenized by the air duct plate 2 and diffused throughout the entire area, ensuring uniform temperature drop under low-temperature conditions; the fan 21 drives the air to flow continuously along the circulating air duct, which can effectively reduce the temperature difference between different areas inside the cabin, ensuring that all sunshade bodies 4 are under the same environmental load. The use of heating and cooling units in conjunction with the full-area circulating air duct can effectively suppress temperature fluctuations inside the sealed cabin 1, ensure the temperature control accuracy during high and low temperature alternation, and ensure the accuracy of environmental load loading.

[0038] In the initial state, the magnetic push plate 672 is located at the initial positions of the left and right ends of the bidirectional lead screw 676, the gear disk 662 is at the initial alignment angle, the support slide rod 64 is located at the starting position within the longitudinal section of the limiting hole 63, the electric gripper 65 is in the open and ready-to-grip state, the front and rear cabinet doors of the sealed chamber 1 are both in the open state, the electric heating tube 11 is in the power-off cooling state, the valve of the cold air pipe 22 is in the closed state, the fan 21 is in the stopped state, and the temperature inside the sealed chamber 1 is the same as the room temperature.

[0039] During the clamping and initial positioning stage of the sunshade body 4, the operator first installs several sunshade bodies 4 in sequence. Specifically, the operator fixes the upper end of the support seat 43 on the plate 41 to the mounting base 51, and inserts the vertical section of the L-shaped rotating shaft 42 into the preset clearance hole of the mounting base 51 to achieve rotational support. Then, the operator fixes the upper end of the hook 44 of the sunshade body 4 to the mounting base 52, and controls the short shaft 45 to engage with the hook 44, thus completing the stable mounting of the sunshade body 4 under the partition 3. After several sunshade bodies 4 are clamped, the operator closes several cabinet doors on the sealed compartment 1. It should be noted that the hooks 44 on the left and right sun visor bodies 4 face opposite directions to ensure that the subsequent flipping of the left and right sun visor bodies 4 will not cause interference. Furthermore, since mounting seat 1 51 is located inside the partition 3 and mounting seat 2 52 is located outside the partition 3, this layout completely simulates the fixed installation method of the sun visor assembly in the roof of a real vehicle. Even if the sun visor body 4 is subjected to alternating stresses of high and low temperatures and repeated flipping loads in subsequent tests, its clamping stability will not be affected, effectively solving the problem of boundary condition distortion caused by the clamping method of traditional testing equipment not matching the real vehicle.

[0040] Several sets of mounting base 1 51 and mounting base 2 52 can simultaneously load multiple sun visor bodies 4 for parallel testing. Samples can be loaded on both the upper and lower partitions 3, making full use of the internal space of the sealed chamber 1. The mounting base 1 51 and mounting base 2 52 simulate the fixed installation environment of the actual vehicle roof, ensuring that the boundary conditions of the sun visor body 4 during the testing process are highly consistent with the actual use state. In addition, through the preset and adaptation of the longitudinal section length of the limiting hole 63, universal clamping and alignment of sun visor bodies 4 of different lengths can be achieved, ensuring that the electric gripper 65 is always clamped in the most balanced position in the middle of the plate body 41, laying the foundation for the stability and repeatability of subsequent Y-axis flipping and pulling tests.

[0041] During the high and low temperature alternating environment construction phase, after the sunshade body 4 is clamped and positioned, the high and low temperature alternating test environment is constructed according to the preset temperature cycle curve. If the cooling program is executed, the cold air pipe 22 delivers the refrigerant to the air chambers symmetrically preset on the left and right sides of the air duct plate 2. The cold air is evenly blown into the interior of the sealed chamber 1 through several waist-shaped vents at the lower end of the air duct plate 2 and several circular air holes at the upper end of the sealed chamber 1. It passes through several vent holes 61 on the partition plate 3, flows evenly through several test areas of the sunshade body 4, and then flows back to form a complete circulating air duct, so that the temperature inside the sealed chamber 1 is rapidly reduced to the preset low temperature value. If the heating program is executed, several electric heating tubes 11 on the inner walls of the left and right ends of the sealed chamber 1 are simultaneously energized and heated. The electric heating tubes 11, which are symmetrically distributed up and down and front and back, radiate heat into the chamber from multiple directions to avoid local temperature differences and ensure that the electric heating tubes 11 can evenly raise the temperature inside the sealed chamber 1 to the preset high temperature value through radiation and convection.

[0042] During both the temperature holding and changing phases, the two fans 21 on the left and right must be kept running continuously to force air to circulate between the air cavity of the sealed chamber 1 and the air duct plate 2, ensuring the uniformity of the temperature field inside the sealed chamber 1 and avoiding local overcooling or overheating. This enables the precise construction and dynamic control of the high and low temperature alternating environment. The uniform air supply design of the symmetrically arranged electric heating tubes 11 and the air duct plate 2 ensures the high uniformity of the temperature field inside the sealed chamber 1, solving the problems of large temperature gradient and uncontrollable temperature change rate in traditional test chambers. This provides reliable environmental conditions for the subsequent synchronous dynamic flip load test during the high and low temperature alternating process.

[0043] During the clamping and alignment stage, once the ambient temperature inside the sealed chamber 1 reaches the preset test conditions and stabilizes, the clamping and alignment action can be performed to complete the precise clamping and positioning of the sunshade body 4 before testing. Specifically, the front and rear servo motors 69 first drive the corresponding drive shafts 68 to rotate. The drive shafts 68 will drive the connected upper and lower drive gears 664 to rotate synchronously. Both the front and rear drive gears 664 will drive the corresponding gear disks 662 to rotate through gear transmission. Since the left and right gear disks 662 are symmetrically arranged, their rotation directions must be opposite until they rotate synchronously to the clamping and alignment position. During this process, the short arc segment of the mating hole 663 is precisely aligned with the longitudinal segment of the limiting hole 63 to achieve limiting engagement, forming a linear motion trajectory channel. The support slide rod 64 drives the electric gripper 65 to slide from the inner side of the longitudinal section of the limiting hole 63 to the outer side of the longitudinal section (the intersection of the longitudinal section and the arc section). When the electric gripper 65 moves with the support slide rod 64 to the intersection of the longitudinal section and the arc section of the limiting hole 63, the electric gripper 65 will be directly facing the middle position of the plate 41. At this time, control the electric gripper 65 to close and clamp the plate 41, thus completing the clamping and alignment work. Through the adjustable adaptation design of the longitudinal section of the limiting hole 63, it can be compatible with sunshade body 4 of different length specifications, and achieve precise clamping of the middle of the plate 41, ensuring accurate load application position and uniform clamping force.

[0044] It should be noted that when the left and right gear disks 662 rotate synchronously to the clamping and alignment position, the straight segment on the mating hole 663 will be aligned with the transverse segment on the limiting hole 63 and connected to each other. The long arc segment on the mating hole 663 will coincide with the curvature center of the arc segment on the limiting hole 63. The arc paths are precisely aligned and connected to each other. The gear disk 662 will rotate from the previous tilted state to the aligned state, and the magnetic push plate 672 will stay at the initial position. The length direction of the waist-shaped sliding hole 673 will be parallel and aligned with the longitudinal segment of the limiting hole 63 and connected to each other.

[0045] During the fatigue test of the flip-pull displacement, after the electric gripper 65 precisely clamps the sunshade body 4, the servo motor 677 controls the connected bidirectional lead screw 676 to rotate. Under the transmission action of the transmission belt, the upper and lower bidirectional lead screws 676 will rotate synchronously. At this time, the bidirectional lead screw 676 will drive the two left and right magnetic push plates 672 on the same partition 3 to move away from each other. During this period, the front and rear sliding shafts 678 at the lower end of the magnetic push plate 672 will perform adaptive sliding compensation along the corresponding waist-shaped sliding groove 671. Under the precise limiting action of the limiting hole 63, the mating hole 663 and the waist-shaped sliding hole 673, the support slide rod 64 will drive the corresponding sunshade body 4 to perform the Y-axis lateral flip test action and the axial pull displacement test action in sequence through the electric gripper 65.

[0046] Y-axis lateral flip test action: Under the coordinated guidance of the limiting hole 63, the mating hole 663 and the waist-shaped sliding hole 673, the support slide rod 64 will enter the arc segment trajectory from the intersection of the longitudinal section and the arc segment on the limiting hole 63. During this process, the support slide rod 64 will drive the electric gripper 65 to slide along the arc segment. Since the connecting shaft 46 is rotatably connected to the horizontal section of the L-shaped rotating shaft 42, the guiding effect of the arc segment trajectory drives the plate 41 to laterally flip around the vertical section of the L-shaped rotating shaft 42, that is, to rotate around the Y-axis, thereby simulating the usage scenario of the driver flipping the sun visor towards the side window.

[0047] It should be noted that during this process, the gear disk 662 maintains the alignment state of the flipping station, and the long arc segment of the mating hole 663 and the arc segment of the limiting hole 63 keep their curvature centers coincide, and the arc path is precisely aligned. When the support slide rod 64 moves along the arc trajectory, there is no radial interference. Moreover, since the waist-shaped sliding hole 673 is a long strip structure, its length direction can adapt to the lateral displacement generated by the arc movement of the support slide rod 64. The magnetic sliding sleeve 675 will perform adaptive sliding compensation along the length direction of the hole in the waist-shaped limiting groove 674, so that the support slide rod 64 slides smoothly along the arc segment, thereby driving the sunshade body 4 to complete the lateral flipping action around the Y axis.

[0048] Axial pull-out displacement test action: When the support slide rod 64 continues to enter the transverse section from the arc section on the limit hole 63 under the coordinated guidance of the limit hole 63, the mating hole 663 and the waist-shaped sliding hole 673, under the horizontal guidance of the transverse section, the support slide rod 64 will drive the plate 41 to generate a horizontal displacement along the L-shaped rotating shaft 42 through the electric gripper 65. During this process, the connecting shaft 46 will perform adaptive sliding compensation along the inner wall of the circular hole at the upper end of the plate 41, thereby simulating the operation of the driver pulling out or pushing back the sun visor from the roof installation position. The stroke of the plate 41 pull-out displacement is determined by the length of the transverse section of the limit hole 63. During the pull-out process, the straight section outlet of the mating hole 663 is connected to the vent 61 through the clearance groove to ensure that the support slide rod 64 slides smoothly and without interference in the transverse section.

[0049] It should be noted that during this process, the end of the straight section of the mating hole 663 is connected to the clearance groove and the vent hole 61 on the mounting groove 62, providing sufficient movement space for the support slide rod 64 without structural interference. Furthermore, the Y-axis lateral flipping test action and the axial pull-out displacement test action of the sun visor body 4 are not executed independently. The sliding stroke of the magnetic push plate 672 can be adjusted in real time to realize the dynamic changes of the Y-axis flipping speed frequency, flipping angle, pull-out displacement speed, and pull-out stroke, realistically simulating the complex operation of the driver flipping the sun visor laterally and pulling it out to different positions simultaneously.

[0050] By employing the fixed part 5 and the flipping test part 6 in conjunction, the simultaneous application of high and low temperature alternating environment and Y-axis flipping and pulling combined load can be achieved, which mainly makes up for the shortcoming of conventional flipping test equipment that can only perform single axial flipping. Through the precise guidance of the arc-shaped segment and the lateral segment of the limiting hole 63, the Y-axis flipping and axial pulling displacement can be combined and automatically switched in the same continuous process, which can realistically simulate the asymmetric combined operation of the driver flipping the sun visor to the side and pulling it out simultaneously, providing a test scheme that is closer to the actual vehicle use conditions for the comprehensive evaluation of the fatigue resistance of the sun visor body 4.

[0051] During the real-time monitoring and data acquisition phase, throughout the entire high and low temperature alternation and Y-axis flipping and pulling test cycle, high-precision external sensors are required to collect the Y-axis lateral flipping torque and shaft pulling force in real time. The system continuously monitors the friction damping attenuation trend, lateral flipping angle, and hovering position changes at the mating points of the L-shaped shaft 42, support 43, and connecting shaft 46. This comprehensively evaluates the attenuation law of the sun visor's lateral hovering retention capability. All monitoring data are stored synchronously according to the test stage and used to calculate and analyze key performance indicators such as changes in lateral flipping friction torque, axial pulling resistance, attenuation of hovering retention capability, and shaft wear of the sun visor assembly. This allows for uninterrupted online acquisition of core performance parameters in a closed high and low temperature environment, without interrupting the continuous testing process by opening the enclosure. It enables real-time tracking of performance degradation laws under Y-axis flipping and shaft pulling conditions, providing continuous and accurate data support for fatigue life analysis and failure mode determination.

[0052] During the test completion and reset unloading phase, after completing the preset set of continuous test actions and temperature change cycles, the servo motor 677 controls the connected bidirectional lead screw 676 to rotate in the reverse direction. Under the transmission action of the transmission belt, the upper and lower bidirectional lead screws 676 will rotate synchronously. At this time, the bidirectional lead screw 676 will drive the two left and right magnetic push plates 672 on the same partition 3 to move closer to each other and return to the initial position. Then, the two servo motors 69 drive the corresponding gear disks 662 to reset to the initial angle. At this time, the support slide rod 64 will drive the electric gripper 65 to return to its original position and slide to the starting position in the longitudinal section of the limit hole 63. Then, the electric gripper 65 can be controlled to release the sunshade body 4. Then, the electric heating tube 11 is controlled to stop working, the cold air pipe 22 stops outputting cold air, and the left and right... Fan 21 runs continuously until the temperature inside the sealed chamber 1 drops to room temperature. Finally, the operator opens several cabinet doors of the sealed chamber 1 in sequence and takes out the tested sunshade body 4. Then, appearance inspection, structural re-inspection, and performance re-testing can be carried out. If any of the characteristic parameters extracted during the test exceed the limit, the sunshade body 4 is determined to be a defective product. If multiple indicators are within the qualified threshold range, the sunshade body 4 is determined to be a qualified product. This achieves fully automated shutdown and reset, reducing the intensity of manual operation. The temperature inside the sealed chamber 1 automatically drops to room temperature before the cabinet doors are opened, ensuring operational safety. The two core tests of Y-axis flipping and pulling can be completed in a single clamping. After the test is completed, the next batch of samples can be quickly switched, improving the continuous operation efficiency of the equipment and the test turnover speed.

[0053] It is worth emphasizing that when the support slide rod 64 drives the electric gripper 65 and the sun visor body 4 to perform a Y-axis lateral flipping action, the support slide rod 64 and the electric gripper 65 will also perform a lateral flipping action simultaneously with the lateral flipping of the sun visor body 4, and their orientation will change. Throughout the entire process of reciprocating flipping and axial pulling displacement test action, the electric gripper 65 will maintain the same relative orientation with the sun visor body 4. When the support slide rod 64 drives the electric gripper 65 to return to its original position and slide to the starting position in the longitudinal section of the limiting hole 63, under the magnetic attraction force generated by the magnetic sleeve 675 relative to the magnetic push plate 672, the support slide rod 64 will drive the electric gripper 65 to return to its initial state and maintain a stable orientation. Without external force interference, there will be no positional shift, which facilitates the next loading and clamping work during cyclic testing. Finally, it is worth emphasizing that the high and low temperature alternating working temperature range in this application is set to -40 degrees Celsius to 85 degrees Celsius, covering the extreme temperature conditions of actual use of automotive interior parts. Among them, the magnetic push plate 672 and the magnetic sliding sleeve 675 are made of high and low temperature resistant permanent magnet materials. In the temperature range of -40 degrees Celsius to 85 degrees Celsius, the magnetic performance decay rate of the material meets the test requirements, the magnetic attraction driving force remains stable, and there will be no problems such as insufficient magnetic force, detachment or power transmission failure due to high and low temperature alternation. The test process is reliable.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fatigue testing system for a high and low temperature alternating sunshade assembly, characterized in that, include: The sealed chamber (1) has cabinet doors that are hinged symmetrically at both ends. The upper end of the sealed chamber (1) has an air duct plate (2). The air duct plate (2) has air chambers that are symmetrically pre-set inside. The inner wall of the sealed chamber (1) has partitions (3) that are symmetrically installed on the upper and lower sides. Several rectangular sunshade bodies (4) are placed below the partitions (3). The partitions (3) have fixing parts (5). The sealed chamber (1) and the partitions (3) have a flip test part (6). Among them, electric heating tubes (11) are installed on the corresponding partitions (3) on the inner walls of the left and right ends of the sealed chamber (1). There are several electric heating tubes (11), two of which are symmetrically distributed vertically, and the remaining two are symmetrically distributed front and back. The flip test section (6) includes a ventilation hole (61) located at the upper end of the partition (3). Several ventilation holes (61) are provided, and the ventilation holes (61) are evenly distributed in a rectangular shape. The upper end of the partition (3) is also provided with an installation groove (62). The installation groove (62) is composed of two circular grooves on the left and right and a rectangular groove. The circular groove is symmetrically provided with a clearance groove. The clearance groove is rectangular and is connected to the corresponding ventilation hole (61). The installation groove (62) is provided with an alignment group (66). The sealed chamber (1) and the alignment group (66) are jointly provided with a flip test group (67). The flipping test section (6) also includes a limiting hole (63) opened on the inner wall of the lower end of the mounting groove (62). The limiting hole (63) is composed of a longitudinal section, an arc section and a transverse section. A support slide rod (64) is slidably installed on the inner wall of the longitudinal section of the limiting hole (63). An electric gripper (65) for automatically clamping the sunshade body (4) is installed at the lower end of the support slide rod (64). The alignment group (66) includes support columns (661) that are symmetrically rotated on the inner wall of the mounting groove (62). Gear disks (662) are fixedly mounted on the outer walls of the two support columns (661) in an alternating manner. Mating holes (663) are provided on the front and rear sides of the upper end of the gear disks (662). The mating holes (663) are composed of short arc segments, long arc segments and straight segments. Transmission gears (664) are rotatably mounted on the inner wall of the lower end of the rectangular groove of the mounting groove (62) on the front and rear sides respectively. The flip test group (67) includes a waist-shaped sliding groove (671) opened at the upper end of the partition (3). A magnetic push plate (672) is symmetrically slidably installed on the upper end of the partition (3). A waist-shaped sliding hole (673) is symmetrically opened at the upper end of the magnetic push plate (672). A waist-shaped limiting groove (674) is opened on the inner wall of the waist-shaped sliding hole (673). A magnetic sliding sleeve (675) is fixedly sleeved on the upper side of the outer wall of the support slide rod (64). The outer wall of the magnetic sliding sleeve (675) is slidably connected to the inner wall of the waist-shaped limiting groove (674).

2. The fatigue testing system for a high and low temperature alternating sunshade assembly according to claim 1, characterized in that: The sunshade body (4) is composed of a plate (41), an L-shaped rotating shaft (42), a support (43) and a hook (44). The vertical section of the L-shaped rotating shaft (42) rotates through the support (43). A short shaft (45) is integrally installed on the upper end of the plate (41) corresponding to the hook (44) through a notch. A connecting shaft (46) is rotatably installed on the side of the upper end of the plate (41) away from the short shaft (45) through a round hole. The connecting shaft (46) is rotatably connected to the horizontal section of the L-shaped rotating shaft (42).

3. The fatigue testing system for a high and low temperature alternating sunshade assembly according to claim 2, characterized in that: The fixing part (5) includes a fixing group located at the lower end of the partition (3). There are several fixing groups, which are evenly distributed in a rectangle. The fixing group includes a mounting seat one (51) and a mounting seat two (52) respectively installed at the lower end of the partition (3). The mounting seat one (51) is located inside the partition (3), and the mounting seat two (52) is located outside the partition (3). The upper end of the support shaft seat (43) is fixedly connected to the mounting seat one (51). The lower end of the mounting seat one (51) has a clearance hole corresponding to the L-shaped rotating shaft (42). The upper end of the hook (44) is fixedly connected to the mounting seat two (52).

4. The fatigue testing system for a high and low temperature alternating sunshade assembly according to claim 1, characterized in that: The limiting holes (63) are provided in a plurality of rectangular uniform distributions, and the limiting holes (63) on the left and right sides are designed to face opposite directions.

5. The fatigue testing system for a high and low temperature alternating sunshade assembly according to claim 1, characterized in that: The outer wall of the gear disk (662) has only a semi-circular area with tooth structure and the other semi-circular area with smooth wall structure. The two gear disks (662) are arranged symmetrically from left to right. The outlet of the straight section on the mating hole (663) is connected to the mounting groove (62). The short arc sections on the front and rear mating holes (663) are evenly distributed around the circumference. The short arc sections and long arc sections on the front and rear mating holes (663) are both symmetrically designed from front to back.

6. The fatigue testing system for a high and low temperature alternating sunshade assembly according to claim 1, characterized in that: The transmission gear (664) has a stepped shaft structure. The front and rear transmission gears (664) are arranged in opposite directions, with the front transmission gear (664) meshing with the right gear disk (662) and the rear transmission gear (664) meshing with the left gear disk (662).

7. The fatigue testing system for a high and low temperature alternating sunshade assembly according to claim 1, characterized in that: The waist-shaped slide groove (671) is provided in several ways. The several waist-shaped slide grooves (671) are evenly distributed in a rectangular shape. The flip test group (67) also includes a slide shaft (678) symmetrically installed at the lower end of the magnetic push plate (672). The outer wall of the slide shaft (678) is slidably connected to the inner wall of the corresponding waist-shaped slide groove (671).

8. The fatigue testing system for a high and low temperature alternating sunshade assembly according to claim 7, characterized in that: The flip test group (67) also includes a bidirectional lead screw (676) that is symmetrically rotated and installed on the outer walls of the left and right ends of the sealed chamber (1). The two threaded sections on the bidirectional lead screw (676) are designed with opposite directions of rotation. The two magnetic push plates (672) on the left and right sides of the same partition (3) are respectively threaded to the two threaded sections on the corresponding bidirectional lead screw (676). The left ends of the two bidirectional lead screws (676) are connected by a transmission belt. A servo motor (677) for driving the upper bidirectional lead screw (676) to rotate is installed on the left end of the sealed chamber (1).

9. The fatigue testing system for a high and low temperature alternating sunshade assembly according to claim 6, characterized in that: The flip test section (6) also includes a drive shaft (68) that is symmetrically installed on the sealed chamber (1), the air duct plate (2) and the upper and lower partitions (3). Several drive gears (664) are respectively fixedly sleeved on the outer wall of the corresponding drive shaft (68). The upper end of the air duct plate (2) is symmetrically installed with a servo motor (69) for driving the corresponding drive shaft (68) to rotate.

10. The fatigue testing system for a high and low temperature alternating sunshade assembly according to claim 9, characterized in that: The upper end of the air duct plate (2) is equipped with a fan (21) through the two air cavities on the left and right. The right end of the air duct plate (2) is symmetrically equipped with a cold air pipe (22) which is connected to the corresponding air cavity. The lower end of the air duct plate (2) is equipped with several waist-shaped air vents that are linearly and evenly distributed in the two air cavities on the left and right. The upper end of the sealed chamber (1) is equipped with several circular air holes that are evenly distributed in a rectangular array in the two air cavities on the left and right.

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