Automobile seat mechanical strength testing device

Abstract

This invention discloses a mechanical strength testing device for automobile seats, comprising a sealed testing chamber and a testing device, with the testing device installed inside the sealed testing chamber. The sealed testing chamber is equipped with a cooling device and a heating device. The testing device includes a vertical load indenter assembly and a friction testing motion mechanism. The friction testing motion mechanism can drive the seat fixing frame to reciprocate horizontally along the length and width directions of the testing device. The sealed testing chamber utilizes the cooling and heating devices to simulate extreme environments such as low and high temperatures. In testing the abrasion resistance of automobile seat fabrics and frames, as well as simulating the bumps during vehicle driving and testing the fatigue strength of the seat frame and filling under vibration, the device incorporates the influence of extreme temperature conditions on automobile seat fabrics and frames. The cooperation between the vertical load indenter assembly and the friction testing motion mechanism can also complete the testing of seat abrasion resistance, and integrates the combined effects of various loads on the seat.

Description

Technical Field

[0001] This invention belongs to the technical field of automotive seat testing equipment, specifically an automotive seat mechanical strength testing device. Background Technology

[0002] As a crucial passive safety component, the strength and performance of car seats directly impact occupant safety in collisions. Professional testing organizations conduct a series of strength and durability tests on car seat assemblies and their key components according to national and industry standards. These tests aim to verify structural integrity, energy absorption capacity, and dynamic response characteristics, ensuring compliance with regulatory requirements and design objectives. Key testing points include static load strength, dynamic impact performance, headrest strength, adjustment mechanism durability, and reliability assessment of materials and connections, providing a scientific basis for product design verification, quality control, and safety certification.

[0003] For example, Chinese invention patent CN120558590B discloses a car seat strength testing device, including a test bracket. A support box is fixedly installed on the upper end of one side of the test bracket. The bottom and front of the support box are open. A flip adjustment plate is rotatably installed on the front end of the inner cavity of the support box. The flip adjustment plate is rotatably connected to the support box via a round shaft. A docking plate is fixedly connected to the front side of the flip adjustment plate. A T-shaped slot is provided on the docking plate. An impact component is installed on the front side of the docking plate. A T-shaped insert is fixedly connected to the rear side of the impact component. When it is necessary to adjust the tilt angle of the impact component to use the car seat backrest... When adjusting the backrest angle, first, the pawl in the anti-loosening mechanism releases its lock on the ratchet; then, the first locking tooth block in the locking mechanism separates from the sector-shaped inner tooth plate, and the second locking tooth block separates from the gear; at this point, the tilting adjustment plate can be rotated up or down as needed. Chinese invention patent CN119064033B discloses a method and system for testing the safety performance of automotive seats, including: determining the basic components of the automotive seat, constructing a processing chain, introducing an assembly robotic arm and fixing processes; analyzing assembly distribution characteristics, combining torque data, evaluating structural strength in finite element software, and providing safety performance warnings. This solves the technical problem that a single testing item is insufficient to form a systematic evaluation of the overall safety performance of the automotive seat, neglecting the interaction between various seat components and its impact on the overall structural strength. By using torque datasets combined with finite element analysis software, and analyzing the mirror-symmetric and cross-symmetric distributions in the assembly distribution characteristics, the integrity and stability of the seat structure are evaluated, ensuring the systematic nature of the test results. This achieves accurate evaluation of seat performance and improves the objectivity and accuracy of the test results.

[0004] In addition to the aforementioned testing equipment and methods, the tests also include using a robotic arm to simulate the human body repeatedly entering and exiting the seat to test the abrasion resistance of the fabric and frame, and simulating the bumps during vehicle operation to test the fatigue strength of the seat frame and filling under vibration.

[0005] Current automotive seat mechanical strength testing has several areas for improvement. For example, existing testing equipment, including tests on the abrasion resistance of fabrics and frames, and the fatigue strength of seat frames and fillings under vibration, is typically conducted at room temperature. This neglects the impact of extreme high and low temperatures on material properties, especially for polymer materials such as fabrics and fillings. Their mechanical properties change under extreme temperatures. For instance, in actual use environments, such as frigid winters or hot summers, when the vehicle is in motion but the interior temperature has not yet returned to a suitable level, seats may simultaneously experience friction and loads under extreme conditions. Mechanical strength tests conducted at room temperature cannot reflect the true strength of the seat under extreme environments. Secondly, existing automotive seat mechanical strength testing equipment is relatively limited in function. Each type of testing equipment typically only simulates one type of load or effect. However, in actual use environments, automotive seats experience multiple loads simultaneously. For example, during vehicle operation, the seat bears the weight of passengers, friction, and cyclic loads generated by vehicle vibrations. Existing automotive seat mechanical strength testing equipment often cannot simulate the combined effects of multiple loads on the seat. Summary of the Invention

[0006] This invention proposes a mechanical strength testing device for automobile seats, aiming to solve the problem that existing mechanical strength testing equipment for automobile seats cannot fully reflect the impact of high and low temperature environments on the mechanical strength of seats, as well as the combined effect of various loads on seats.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A mechanical strength testing device for an automobile seat includes a sealed testing chamber and a testing device, wherein the testing device is installed inside the sealed testing chamber.

[0009] The sealed test chamber is equipped with refrigeration and heating devices.

[0010] The testing device includes a test frame installed inside the sealed test chamber and a seat fixing frame for fixing the test seat. A vertical load indenter assembly is movably installed on the upper part of the test frame, and the vertical load indenter assembly extends above the seat fixing frame. A first linear actuator is connected between the test frame and the vertical load indenter assembly, and the first linear actuator can drive the vertical load indenter assembly to reciprocate in the vertical direction on the test frame.

[0011] A friction testing motion mechanism is connected between the seat fixing frame and the bottom of the sealed test chamber. The friction testing motion mechanism can drive the seat fixing frame to move horizontally back and forth along the length and width directions of the test device, respectively.

[0012] Preferably, the sealed test chamber includes a chamber body, a door is movably installed on one side of the chamber body, and observation windows are provided on the door and the side wall of the chamber body; a controller is provided on the outside of the chamber body, and a temperature sensor is installed inside the chamber body, and the temperature sensor, refrigeration device and heating device are electrically connected to the controller respectively.

[0013] Preferably, the refrigeration device is a compression refrigeration unit installed on the top of the cabin, the cold air outlet of the compression refrigeration unit is located on the inner wall of the cabin, and the heating device is an infrared heater installed on the inner wall of the cabin.

[0014] Preferably, the test frame includes a column fixedly installed at the bottom of the sealed test chamber, a crossbeam connected to the top of the column, the crossbeam extending horizontally above the seat fixing frame, a set of guide rods slidably installed on the crossbeam, the lower end of the guide rods being connected to the vertical load pressure head assembly, the first linear actuator being fixedly installed vertically at the lower part of the crossbeam, and the output end of the first linear actuator being connected to the vertical load pressure head assembly;

[0015] Preferably, the column includes an outer column fixedly installed at the bottom of the sealed test chamber, a telescopic column is movably inserted into the outer column, and the top of the telescopic column is connected to a crossbeam; a second linear actuator is connected between the telescopic column and the outer column, the second linear actuator being either a hydraulic cylinder or an electric cylinder; a support plate is connected to the outer wall of the telescopic column, and the support plate is capable of abutting against the top of the outer column.

[0016] Preferably, the first linear actuator is a pneumatic cylinder, and a force sensor is connected between the output end of the pneumatic cylinder and the vertical load pressure head assembly. The force sensor is electrically connected to the air source of the pneumatic cylinder through a controller.

[0017] The upper end of the guide rod extends out of the upper part of the crossbeam and is connected to a limit stop. A return spring is fitted on the outer wall of the upper part of the guide rod, and the two ends of the return spring abut against the limit stop and the crossbeam, respectively.

[0018] Preferably, the friction test motion mechanism includes a base fixedly installed at the bottom of the sealed test chamber, a first guide rail is installed on the base, a longitudinal moving seat is slidably installed on the first guide rail, and a longitudinal linear actuator is connected between the longitudinal moving seat and the base. The longitudinal linear actuator can drive the longitudinal moving seat to reciprocate linearly along the length direction of the test device on the first guide rail.

[0019] A second guide rail is installed on the longitudinal moving seat, and a transverse moving seat is slidably installed on the second guide rail. The seat fixing frame is fixedly installed on the upper part of the transverse moving seat, and a transverse linear actuator is connected between the transverse moving seat and the longitudinal moving seat.

[0020] The longitudinal linear actuator and the transverse linear actuator are one of an electric cylinder, a hydraulic cylinder, or a pneumatic cylinder.

[0021] Preferably, a longitudinal limiting block is installed on the upper part of the base, and a longitudinal limiting rubber pad is installed on the side of the longitudinal moving seat facing the longitudinal limiting block, and the longitudinal limiting rubber pad can abut against the longitudinal limiting block;

[0022] A lateral limiting block is installed on the upper part of the longitudinal moving seat, and a lateral limiting rubber pad is installed on the side of the lateral moving seat facing the lateral limiting block. The lateral limiting rubber pad can abut against the lateral limiting block.

[0023] The lateral limiting rubber pad has a recessed hole, and a lateral limit switch is installed in the recessed hole, with the actuating end of the limit switch extending out of the recessed hole; the longitudinal limiting rubber pad has the same structure as the lateral limiting rubber pad, and a longitudinal limit switch is installed in the recessed hole of the longitudinal limiting rubber pad; the longitudinal limit switch and the lateral limit switch are electrically connected to the longitudinal actuator and the lateral linear actuator respectively through a controller.

[0024] Preferably, the vertical load pressure head assembly includes a first connecting plate, a second connecting plate, and a contact portion. The contact portion is fixedly installed on the lower part of the second connecting plate, and a hinge is fixedly installed on the upper part of the second connecting plate and hinged to the first connecting plate through the hinge. The upper part of the first connecting plate is connected to the guide rod and the output end of the first linear actuator. An angle adjustment mechanism is connected between the first connecting plate and the second connecting plate, and the angle adjustment mechanism is used to change the included angle between the first connecting plate and the second connecting plate.

[0025] Preferably, the tilt adjustment mechanism includes a nut seat and a lead screw. A set of third guide rails and a set of shaft supports are respectively installed on the lower part of the first connecting plate. The lead screw is rotatably mounted on the shaft supports. The nut seat is slidably mounted on the third guide rails and threadedly connected to the lead screw. During the rotation of the lead screw, it can drive the nut seat to move along the length direction of the testing device on the third guide rails. Connecting rods are respectively hinged at both ends of the nut seat. The other end of the connecting rod is hinged to the second connecting plate.

[0026] Beneficial effects:

[0027] Compared with the prior art, the present invention can achieve at least the following technical effects:

[0028] 1. This invention installs the testing device inside a sealed testing chamber. The sealed testing chamber uses refrigeration and heating devices to simulate extreme environments such as low temperature and high temperature. In testing items such as the abrasion resistance of car seat fabrics and frames, as well as simulating the bumps during vehicle driving and testing the fatigue strength of seat frames and fillings under vibration, it integrates the effects of extreme temperature conditions on car seat fabrics and frames, which is closer to the actual use environment of seats. This makes the test results more comprehensive and helpful in providing more comprehensive guidance for the design and manufacturing process of car seat materials and structures.

[0029] 2. The first linear actuator of the present invention can apply a static load to the seat under test by pushing the vertical load indenter assembly with constant pressure to test the seat frame and filling material's ability to withstand static loads; it can also reciprocate to apply a cyclic load to the seat under test. At the same time, by using the cooperation of the vertical load indenter assembly and the friction test motion mechanism, the wear resistance of the seat can also be tested. One device can complete multiple tests at once, solving the problems of equipment cost and time cost in testing.

[0030] 3. While conducting abrasion resistance tests, the vertical load indenter assembly of this invention can also apply constant static load and cyclic load to the seat, fully considering the combined effect of various different loads on the seat, which is closer to the actual use conditions of the seat. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0032] Figure 2 This is a schematic diagram of the test device structure of the present invention.

[0033] Figure 3 This is a schematic diagram of the test frame and vertical load indenter assembly of the present invention.

[0034] Figure 4 This is a schematic diagram of the friction testing motion mechanism of the present invention.

[0035] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0036] Figure 6 This is a schematic diagram of the vertical load pressure head assembly of the present invention.

[0037] In the diagram: 1. Sealed test chamber; 11. Chamber body; 12. Chamber door; 13. Refrigeration device; 131. Cold air outlet; 14. Observation window; 15. Heating device; 16. Base plate; 2. Controller; 3. Friction test motion mechanism; 31. Base; 32. First guide rail; 33. Longitudinal moving seat; 34. Second guide rail; 35. Longitudinal linear actuator; 36. Lateral moving seat; 37. Lateral linear actuator; 381. Lateral limit stop; 382. Lateral limit rubber pad; 383. Lateral limit switch; 391. Lateral limit stop; 392. Lateral limit stop; 393. Lateral limit switch ; 4. Seat fixing frame; 5. First linear actuator; 51. Force sensor; 6. Test frame; 61. Column; 611. Outer column; 612. Telescopic column; 613. Second linear actuator; 614. Support plate; 62. Crossbeam; 63. Return spring; 64. Guide rod; 641. Limiting block; 7. Vertical load pressure head assembly; 71. First connecting plate; 72. Second connecting plate; 73. Contact part; 74. Tilt adjustment mechanism; 741. Third guide rail; 742. Nut seat; 743. Lead screw; 744. Connecting rod; 745. Shaft support; 746. Handwheel; 747. Hinge. Detailed Implementation

[0038] The invention will be further explained below with reference to specific implementation examples.

[0039] Please see Figure 1-6 This invention proposes a mechanical strength testing device for automobile seats, such as... Figure 1 As shown, the device includes a sealed test chamber 1 and a test device, with the test device installed inside the sealed test chamber 1;

[0040] The sealed test chamber 1 is equipped with a cooling device 13 and a heating device 15 to simulate extreme environments such as low temperature and high temperature. The cooling device 13 is used to reduce the temperature inside the sealed test chamber 1 to simulate an extreme low temperature environment of -60℃, and the heating device 15 is used to heat the air inside the sealed test chamber 1 to simulate an extreme high temperature environment of up to 60℃.

[0041] The specific structure of the testing device is as follows: Figure 2 As shown, the test includes a test frame 6 installed in a sealed test chamber 1 and a seat fixing frame 4 for fixing the test seat. A vertical load indenter assembly 7 is movably installed on the upper part of the test frame 6 and extends above the seat fixing frame 4. A first linear actuator 5 is connected between the test frame 6 and the vertical load indenter assembly 7. The first linear actuator 5 can drive the vertical load indenter assembly 7 to reciprocate in the vertical direction on the test frame 6.

[0042] During the test, the car seat assembly to be tested is fixedly mounted on the seat mounting bracket 4. The first linear actuator 5 drives the vertical load indenter assembly 7 to move downwards and contact the seat under test on the seat mounting bracket 4. The first linear actuator 5 can either push the vertical load indenter assembly 7 with constant pressure to apply a static load to the seat under test, testing the seat frame and filling's ability to withstand static loads; or it can reciprocate to cause the vertical load indenter assembly 7 to impact the seat under test, applying a cyclic load to test the fatigue resistance and durability of the seat frame and filling under cyclic loads. The first linear actuator 5 can be a pneumatic cylinder, hydraulic cylinder, or electric cylinder.

[0043] Furthermore, a friction test motion mechanism 3 is connected between the seat fixing frame 4 and the bottom of the sealed test chamber 1. The friction test motion mechanism 3 can drive the seat fixing frame 4 to reciprocate horizontally along the length and width directions of the test device, respectively.

[0044] While the vertical load indenter assembly 7 applies a vertical load to the upper part of the seat under test, the friction test motion mechanism 3 drives the seat fixing frame 4 to reciprocate horizontally along the length or width direction of the test device, or simultaneously move in a combined manner along the length and width directions. The vertical load indenter assembly 7 rubs against the seat, testing the durability of the seat fabric and filling under friction. During the test, the vertical load indenter assembly 7 can be applied to the surface of the seat under test with a constant pressure, or it can be applied to the seat under test with alternating pressure to test the durability of the seat fabric and filling under the combined action of cyclic load and friction.

[0045] In this embodiment, the sealing test chamber 1 includes a chamber body 11, a base plate 16 is installed at the bottom of the chamber body 11, and the entire test device is installed on the base plate 16; a door 12 is movably installed on one side of the chamber body 11, and both the door 12 and the chamber body 11 are provided with a layer of thermal insulation material, and a sealing ring is provided between the door 12 and the chamber body 11; before the test begins and after the test is completed, the door 12 is opened, so that one side of the sealing test chamber 1 is in a fully open state, so that the seat to be tested can be fixed on or removed from the test device; during the test, the door 12 is in a closed state, so that the sealing test chamber 1 forms a closed environment, so as to better control the temperature inside the sealing test chamber 1;

[0046] In this embodiment, observation windows 14 are also provided on the side walls of the door 12 and the body 11, so that the situation inside the sealed test chamber 1 can be clearly observed during the test.

[0047] Furthermore, to more accurately control the temperature inside the sealed test chamber 1, this device also includes a controller 2, which is installed on the outside of the chamber 11. Simultaneously, a temperature sensor is installed inside the chamber 11. The temperature sensor, the cooling device 13, and the heating device 15 are electrically connected to the controller 2 to form a closed-loop control. The temperature sensor detects the temperature inside the sealed test chamber 1, and the controller 2 controls the output power of the cooling device 13 and the heating device 15 based on the feedback from the temperature sensor, thereby stabilizing the temperature inside the sealed test chamber 1 at the set target temperature. In addition, the controller 2 can also control the pressure, speed, and direction of the first linear actuator 5. The specific control process is a mature technology in the field and will not be described in detail in this embodiment.

[0048] In this embodiment, the refrigeration device is a compressor refrigeration unit installed on the top of the cabin 11. The cold air outlet 131 of the compressor refrigeration unit is located on the inner wall of the cabin 11. The heating device 15 is an infrared heater installed on the inner wall of the cabin 11, which can better simulate the process of the sun irradiating the vehicle interior to heat up.

[0049] The specific structure of test fixture 6 is as follows Figure 3 As shown, the test chamber includes a column 61 fixedly installed at the bottom of the sealed test chamber 1, a crossbeam 62 connected to the top of the column 61, the crossbeam 62 extending horizontally above the seat mounting frame 4, a set of guide rods 64 slidably installed on the crossbeam 62, the lower end of the guide rods 64 being connected to the vertical load pressure head assembly 7, a first linear actuator 5 fixedly installed in the lower part of the crossbeam 62 in the vertical direction, and the output end of the first linear actuator 5 being connected to the vertical load pressure head assembly 7.

[0050] Furthermore, the column 61 includes an outer column 611 fixedly installed at the bottom of the sealed test chamber 1, a telescopic column 612 movably inserted into the outer column 611, and the top of the telescopic column 612 connected to the crossbeam 62; a second linear actuator 613 is connected between the telescopic column 612 and the outer column 611, the second linear actuator 613 being either a hydraulic cylinder or an electric cylinder; a support plate 614 is connected to the outer wall of the telescopic column 611, and the support plate 614 can abut against the top of the outer column 611.

[0051] To ensure the response speed of the first linear actuator 5, its stroke should not be too large. Furthermore, to facilitate the installation and removal of the tested seat, the column 61 in this embodiment is designed as a height-adjustable telescopic mechanism. When the tested seat needs to be installed or removed, the second linear actuator 613 raises the telescopic column 612, thus maintaining sufficient space between the lower end of the vertical load pressure head assembly 7 and the tested seat. During testing, the second linear actuator 613 moves the vertical load pressure head assembly 7 downwards via the telescopic column and crossbeam 62, ensuring the distance between the vertical load pressure head assembly 7 and the tested seat is within the range formed by the first linear actuator. The support plate 614 abuts against the top of the outer column 611, providing both limiting and support. Simultaneously, the second linear actuator 613 achieves self-locking through hydraulic pressure or the engagement of a screw nut to counteract the reaction force of the seat on the vertical load pressure head assembly 7.

[0052] Specifically, in this embodiment, the first linear actuator is a pneumatic cylinder, and a force sensor 51 is connected between the output end of the pneumatic cylinder and the vertical load pressure head assembly. The force sensor 51 is electrically connected to the air source of the pneumatic cylinder through the controller 2.

[0053] The upper end of the guide rod 64 extends out of the upper part of the crossbeam 62 and is connected to the limit block 641. A return spring 63 is fitted on the outer wall of the guide rod 64 on the upper part of the crossbeam 62. The two ends of the return spring 63 abut against the limit block 641 and the crossbeam 62 respectively.

[0054] When the air source supplies air to the pneumatic cylinder, the pneumatic cylinder drives the vertical load pressure head assembly 7 to move downward, and at the same time the return spring 63 is compressed. After the air source is disconnected, the return spring 63 drives the vertical load pressure head assembly 7 to return upward. The controller 2 controls the air intake volume and air intake pressure of the pneumatic cylinder according to the feedback of the force sensor 51, and then controls the load applied by the vertical load pressure head assembly 7 to the seat being tested.

[0055] The specific structure of friction test motion mechanism 3 is as follows: Figure 4 As shown, it includes a base 31 fixedly installed at the bottom of the sealed test chamber 1, a first guide rail 32 installed on the base 31, a longitudinal moving seat 33 slidably installed on the first guide rail 32, and a longitudinal linear actuator 35 connected between the longitudinal moving seat 33 and the base 31. The longitudinal linear actuator 35 can drive the longitudinal moving seat 33 to reciprocate linearly along the length direction of the test device on the first guide rail 32.

[0056] A second guide rail 34 is installed on the longitudinal moving seat 33, and a transverse moving seat 36 is slidably installed on the second guide rail 34. The seat fixing frame 4 is fixedly installed on the upper part of the transverse moving seat 36, and a transverse linear actuator 37 is connected between the transverse moving seat 36 and the longitudinal moving seat 33.

[0057] The longitudinal linear actuator 35 and the transverse linear actuator 37 are one of an electric cylinder, a hydraulic cylinder, or a pneumatic cylinder.

[0058] A longitudinal limiting block 381 is installed on the upper part of the base 31, and a longitudinal limiting pad 382 is installed on the side of the longitudinal moving seat 33 facing the longitudinal limiting block 381. The longitudinal limiting pad 382 can abut against the longitudinal limiting block 381.

[0059] A lateral limiting block 391 is installed on the upper part of the longitudinal moving seat 33, and a lateral limiting rubber pad 392 is installed on the side of the lateral moving seat 36 facing the lateral limiting block 391. The lateral limiting rubber pad 392 can abut against the lateral limiting block 391.

[0060] like Figure 5 As shown, a recessed hole is provided on the lateral limiting rubber pad 392, and a lateral limit switch 393 is installed in the recessed hole of the lateral limiting rubber pad 392, with the actuating end of the limit switch 393 extending out of the recessed hole; the structure of the longitudinal limiting rubber pad 382 is the same as that of the lateral limiting rubber pad 392, and a longitudinal limit switch 383 is installed in the recessed hole of the longitudinal limiting rubber pad 382; the longitudinal limit switch 383 and the lateral limit switch 393 are electrically connected to the longitudinal actuator 35 and the lateral linear actuator 37 respectively through the controller 2.

[0061] When the lateral limit pad 392 contacts the lateral limit block 391, the lateral limit switch 393 is triggered, and the controller 2 controls the lateral linear actuator 37 to change the direction of movement; similarly, when the longitudinal limit block 381 contacts the longitudinal limit pad 382, ​​the longitudinal limit switch 383 is triggered, and the longitudinal linear actuator 35 changes direction.

[0062] like Figure 6 As shown, the vertical load pressure head assembly 7 includes a first connecting plate 71, a second connecting plate 72, and a contact part 73. The contact part 73 can simulate the shape of the human buttocks and thighs. It has a rigid skeleton that is rigidly connected to the second connecting plate 72 inside. The skeleton is covered with flexible materials such as silicone, and the outermost layer is covered with fabric material that simulates clothing. The contact part 73 is fixedly installed on the lower part of the second connecting plate 72. A hinge 747 is fixedly installed on the upper part of the second connecting plate 72 and is hinged to the first connecting plate 71 through the hinge 747. The upper part of the first connecting plate 71 is connected to the guide rod 64 and the output end of the first linear actuator 5. An angle adjustment mechanism 74 is connected between the first connecting plate 71 and the second connecting plate 72. The angle adjustment mechanism 74 is used to change the angle between the first connecting plate 71 and the second connecting plate 72 in order to adapt to the tilt angle of the force-bearing surface of different seats.

[0063] Specifically, the tilt adjustment mechanism includes a nut seat 742 and a lead screw 743. A set of third guide rails 741 and a set of shaft supports 745 are respectively installed on the lower part of the first connecting plate 71. The lead screw 743 is rotatably mounted on the shaft support 745. The nut seat 742 is slidably mounted on the third guide rail 741 and threadedly connected to the lead screw 743. One end of the lead screw 743 is connected to a handwheel 746. When the lead screw 743 is rotated by the handwheel 746, the nut seat 742 can be driven to move along the length direction of the test device on the third guide rail 741. The two ends of the nut seat 742 are respectively hinged to connecting rods 744. The other end of the connecting rods 744 is hinged to the second connecting plate 72. When the nut seat 742 moves on the third guide rail 741, it pushes the second connecting plate 72 to rotate along the hinge through the connecting rods 744, thereby changing the angle of the contact part 73.

[0064] In the description of this invention, the term "a plurality of" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] In the description of this invention, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this invention, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for testing the mechanical strength of an automobile seat, characterized in that, It includes a sealed test chamber (1) and a test device, wherein the test device is installed inside the sealed test chamber (1); The sealed test chamber (1) is equipped with a refrigeration device (13) and a heating device (15). The testing device includes a test frame (6) installed in the sealed test chamber (1) and a seat fixing frame (4) for fixing the test seat. A vertical load indenter assembly (7) is movably installed on the upper part of the test frame (6) and extends above the seat fixing frame (4). A first linear actuator (5) is connected between the test frame (6) and the vertical load indenter assembly (7). The first linear actuator (5) can drive the vertical load indenter assembly (7) to reciprocate in the vertical direction on the test frame (6). A friction test motion mechanism (3) is connected between the seat fixing frame (4) and the bottom of the sealed test chamber (1). The friction test motion mechanism (3) can drive the seat fixing frame (4) to move horizontally back and forth along the length and width directions of the test device, respectively.

2. The automotive seat mechanical strength testing device according to claim 1, characterized in that, The sealed test chamber (1) includes a chamber body (11), a door (12) is movably installed on one side of the chamber body (11), and an observation window (14) is provided on the side wall of the door (12) and the chamber body (11); a controller (2) is provided on the outside of the chamber body (11), and a temperature sensor is installed inside the chamber body (11). The temperature sensor, the refrigeration device (13) and the heating device (15) are electrically connected to the controller (2) respectively.

3. The automotive seat mechanical strength testing device according to claim 2, characterized in that, The refrigeration device is a compression refrigeration unit installed on the top of the cabin (11), and the cold air outlet (131) of the compression refrigeration unit is located on the inner wall of the cabin (11). The heating device (15) is an infrared heater installed on the inner wall of the cabin (11).

4. The automotive seat mechanical strength testing device according to claim 1, characterized in that, The test frame (6) includes a column (61) fixedly installed at the bottom of the sealed test chamber (1). A crossbeam (62) is connected to the top of the column (61). The crossbeam (62) extends horizontally above the seat fixing frame (4). A set of guide rods (64) is slidably installed on the crossbeam (62). The lower end of the guide rods (64) is connected to the vertical load pressure head assembly (7). The first linear actuator (5) is fixedly installed in the lower part of the crossbeam (62) in the vertical direction. The output end of the first linear actuator (5) is connected to the vertical load pressure head assembly (7).

5. The automotive seat mechanical strength testing device according to claim 4, characterized in that, The column (61) includes an outer column (611) fixedly installed at the bottom of the sealed test chamber (1), a telescopic column (612) is movably inserted inside the outer column (611), and the top of the telescopic column (612) is connected to the crossbeam (62); a second linear actuator (613) is connected between the telescopic column (612) and the outer column (611), and the second linear actuator (613) is one of a hydraulic or electric cylinder; a support plate (614) is connected to the outer wall of the telescopic column (612), and the support plate (614) can abut against the top of the outer column (611).

6. The automotive seat mechanical strength testing device according to claim 4, characterized in that, The first linear actuator is a pneumatic cylinder. A force sensor (51) is connected between the output end of the pneumatic cylinder and the vertical load pressure head assembly. The force sensor (51) is electrically connected to the air source of the pneumatic cylinder through the controller (2). The upper end of the guide rod (64) extends out of the upper part of the crossbeam (62) and is connected to the limit block (641). A return spring (63) is fitted on the outer wall of the upper part of the guide rod (64) and the crossbeam (62). The two ends of the return spring (63) abut against the limit block (641) and the crossbeam (62) respectively.

7. The automotive seat mechanical strength testing device according to claim 1, characterized in that, The friction test motion mechanism (3) includes a base (31) fixedly installed at the bottom of the sealed test chamber (1), a first guide rail (32) is installed on the base (31), a longitudinal moving seat (33) is slidably installed on the first guide rail (32), and a longitudinal linear actuator (35) is connected between the longitudinal moving seat (33) and the base (31). The longitudinal linear actuator (35) can drive the longitudinal moving seat (33) to reciprocate linearly along the length direction of the test device on the first guide rail (32). A second guide rail (34) is installed on the longitudinal moving seat (33), and a transverse moving seat (36) is slidably installed on the second guide rail (34). The seat fixing frame (4) is fixedly installed on the upper part of the transverse moving seat (36), and a transverse linear actuator (37) is connected between the transverse moving seat (36) and the longitudinal moving seat (33). The longitudinal linear actuator (35) and the transverse linear actuator (37) are one of an electric cylinder, a hydraulic cylinder or a pneumatic cylinder.

8. The automotive seat mechanical strength testing device according to claim 7, characterized in that, A longitudinal limiting block (381) is installed on the upper part of the base (31), and a longitudinal limiting pad (382) is installed on the side of the longitudinal moving seat (33) facing the longitudinal limiting block (381). The longitudinal limiting pad (382) can abut against the longitudinal limiting block (381). A transverse limiting block (391) is installed on the upper part of the longitudinal moving seat (33), and a transverse limiting rubber pad (392) is installed on the side of the transverse moving seat (36) facing the transverse limiting block (391). The transverse limiting rubber pad (392) can abut against the transverse limiting block (391). The transverse limiting pad (392) is provided with a recessed hole, and a transverse limit switch (393) is installed in the recessed hole of the transverse limiting pad (392), with the actuating end of the transverse limit switch (393) extending out of the recessed hole; the structure of the longitudinal limiting pad (382) is the same as that of the transverse limiting pad (392), and a longitudinal limit switch (383) is installed in the recessed hole of the longitudinal limiting pad (382); the longitudinal limit switch (383) and the transverse limit switch (393) are electrically connected to the longitudinal actuator (35) and the transverse linear actuator (37) respectively through the controller (2).

9. The automotive seat mechanical strength testing device according to claim 4, characterized in that, The vertical load pressure head assembly (7) includes a first connecting plate (71), a second connecting plate (72), and a contact part (73). The contact part (73) is fixedly installed on the lower part of the second connecting plate (72). A hinge (747) is fixedly installed on the upper part of the second connecting plate (72) and is hinged to the first connecting plate (71) through the hinge (747). The upper part of the first connecting plate (71) is connected to the guide rod (64) and the output end of the first linear actuator (5). An angle adjustment mechanism (74) is connected between the first connecting plate (71) and the second connecting plate (72). The angle adjustment mechanism (74) is used to change the included angle between the first connecting plate (71) and the second connecting plate (72).

10. The automotive seat mechanical strength testing device according to claim 9, characterized in that, The tilt adjustment mechanism includes a nut seat (742) and a lead screw (743). A set of third guide rails (741) and a set of shaft supports (745) are respectively installed on the lower part of the first connecting plate (71). The lead screw (743) is rotatably mounted on the shaft support (745). The nut seat (742) is slidably mounted on the third guide rail (741) and threadedly connected to the lead screw (743). During the rotation of the lead screw (743), it can drive the nut seat (742) to move along the length direction of the test device on the third guide rail (741). The two ends of the nut seat (742) are respectively hinged to connecting rods (744). The other end of the connecting rods (744) is hinged to the second connecting plate (72).

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