A dynamic test seat for seat belts and a dynamic test method for seat belts

Abstract

This application relates to the technical field of intelligent cockpit safety assessment, and specifically relates to a seat for dynamic testing of seat belts and a method for dynamic testing of seat belts. The seat for dynamic testing of seat belts includes a base, a backrest, a seat cushion, a first locking component, and a second locking component. The backrest is rotatably connected to the base; one end of the seat cushion is rotatably connected to the base, and the other end is rotatably connected to a leg rest; the first locking component includes a first locking screw and a first locking nut for fixing the backrest and the seat cushion; the second locking component includes a second locking screw and a second locking nut for fixing the leg rest and the seat cushion. By adjusting the seat state, the seat can be adjusted to a standard seat state or a zero-gravity seat state. Cooperating with the first locking component and the second locking component, it has reliable locking, occupies less space, and avoids interference during subsequent installation of the seat belt real vehicle points. At the same time, the dynamic testing method ensures that the passengers can receive good protection in different sitting postures.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent cockpit safety assessment, and particularly relates to a seat belt dynamic test seat and a seat belt dynamic test method. Background Art

[0002] With the development of vehicle technology, the degree of vehicle intelligence has been continuously improved, and people pay more attention to comfort. The intelligent cockpit has become the mainstream trend in the development of driverless vehicles. The biggest difference between the intelligent cockpit and the traditional cockpit is that the zero-gravity seat that is more ergonomic replaces the traditional seat, resulting in a significant change in the posture of the human body on the zero-gravity seat compared to the traditional seat. At present, the zero-gravity state of the seat has been defined as the standard operating condition for many vehicle models. However, the existing test standard GB 14166-2013 stipulates that the angle of the seat back of the seat belt dynamic rigid seat is 10°, so it is impossible to verify the restraint ability of the seat belt in the zero-gravity state of the seat, and there is no test method for the restraint ability of the seat belt in the zero-gravity state of the seat in the industry.

[0003] Therefore, there is an urgent need for a seat belt dynamic test seat and a seat belt dynamic test method that can detect the restraint ability of the seat belt in the zero-gravity state of the seat and comprehensively verify whether the seat belt is qualified. Summary of the Invention

[0004] The purpose of the present application is to provide a seat belt dynamic test seat and a seat belt dynamic test method for the above problems.

[0005] In a first aspect, the present application provides a seat belt dynamic test seat, including:

[0006] A base,

[0007] A backrest, the backrest is rotatably connected to the base;

[0008] A seat cushion, one end of the seat cushion is rotatably connected to the base, and the other end is rotatably connected to a leg rest;

[0009] A first locking component, the first locking component includes a first locking screw and a first locking nut. The first locking screw can pass through the backrest and the seat cushion and is threadedly connected to the backrest and the seat cushion. The first locking nut is threadedly connected to the first locking screw for fixing the backrest and the seat cushion;

[0010] A second locking component, the second locking component includes a second locking screw and a second locking nut. The second locking screw can pass through the leg rest and the seat cushion, and the second locking nut is threadedly connected to the second locking screw for fixing the leg rest and the seat cushion.

[0011] According to the technical solution provided by the embodiment of the present application, the first locking screw has a plurality of fixing parts and a plurality of connecting parts arranged in sequence. The connecting parts include a first connecting part and a second connecting part. The backrest is connected to the first connecting part, the seat cushion is connected to the second connecting part, and the first locking nut is connected to the fixing part to limit the backrest and the seat cushion.

[0012] According to the technical solution provided by the embodiment of the present application, the backrest and the seat cushion are threadedly connected to the first locking screw, and the thread directions of the fixing part and the connecting part are opposite.

[0013] According to the technical solution provided by the embodiment of the present application, the first locking nut includes a first part and a second part. The first part is provided with an internal thread for threadedly connecting with the first locking screw. The second part has a through hole with an inner diameter larger than the outer diameter of the first locking screw. The through hole can pass through the first locking screw so that the second part presses against the backrest or the seat cushion.

[0014] According to the technical solution provided by the embodiment of the present application, the seat for dynamic test of seat belt further includes a support base. The support base is placed under the seat cushion and is rotatably connected to the seat cushion to support the seat cushion.

[0015] In a second aspect, the present application provides a method for dynamic test of seat belt. The method uses the above-mentioned seat for dynamic test of seat belt, and the method includes:

[0016] Adjust the angle between the backrest and the seat cushion to a first preset angle range. When the dummy is in a standard sitting posture and the seat belt is fastened, perform a dynamic test to obtain a first set of evaluation indicators. Judge whether all the first set of evaluation indicators are less than the corresponding first set of preset safety values. If all the first set of evaluation indicators are less than the corresponding first set of preset safety values, the seat belt under test meets the dynamic performance requirements in the standard seat state;

[0017] Adjust the angle between the backrest and the seat cushion and the angle between the seat cushion and the leg rest so that the dummy is in a zero-gravity sitting posture. When the seat belt is fastened, perform a dynamic test to obtain a second set of evaluation indicators. Judge whether all the second set of evaluation indicators are less than the corresponding second set of preset safety values. If all the second set of evaluation indicators are less than the corresponding second set of preset safety values, the seat belt under test meets the dynamic performance requirements in the zero-gravity seat state;

[0018] If the seat belt under test meets the dynamic performance requirements in the standard seat state and meets the dynamic performance requirements in the zero-gravity seat state, the seat belt under test is qualified.

[0019] According to the technical solution provided by the embodiment of the present application, the first set of evaluation indicators at least includes the displacement of the chest of the first dummy and the displacement of the buttocks of the first dummy, and the first set of preset safety values at least includes the preset safety value of the displacement of the chest of the first dummy and the preset safety value of the displacement of the buttocks of the first dummy.

[0020] According to the technical solution provided by the embodiment of the present application, the first set of evaluation indicators further includes the real-time speed of the chest of the dummy, and the first set of preset safety values further includes the preset safety value of the real-time speed of the chest of the dummy;

[0021] If the displacement of the buttocks of the first dummy of the front-row dummy is less than the preset safety value of the displacement of the buttocks of the first dummy, and the displacement of the chest of the first dummy is greater than the preset safety value of the displacement of the chest of the first dummy, and if the real-time speed of the chest of the dummy is less than the preset safety value of the real-time speed of the chest of the dummy, then the tested seat belt meets the dynamic performance requirements under the standard seat state; if the real-time speed of the chest of the dummy is greater than the preset safety value of the real-time speed of the chest of the dummy, a restraint system experiment is carried out, and if there is no collision between the dummy and the hard object in front, then the tested seat belt meets the dynamic performance requirements under the standard seat state;

[0022] If the displacement of the buttocks of the first dummy of the rear-row dummy is less than the preset safety value of the displacement of the buttocks of the first dummy, and the displacement of the chest of the first dummy is greater than the preset safety value of the displacement of the chest of the first dummy, a restraint system experiment is carried out, and if there is no collision between the dummy and the hard object in front, then the tested seat belt meets the dynamic performance requirements under the standard seat state.

[0023] According to the technical solution provided by the embodiment of the present application, the second set of evaluation indicators at least includes the displacement of the chest of the second dummy, the displacement of the buttocks of the second dummy, the shoulder belt force, and the waist belt force, and the second set of preset safety values at least includes the preset safety value of the displacement of the chest of the second dummy, the preset safety value of the displacement of the buttocks of the second dummy, the safety value of the shoulder belt force, and the safety value of the waist belt force.

[0024] If the shoulder belt force is less than the safety value of the shoulder belt force and the waist belt force is less than the safety value of the waist belt force, and if the displacement of the chest of the second dummy and / or the displacement of the buttocks of the second dummy is greater than the corresponding preset safety value of the displacement of the chest of the second dummy and / or the preset safety value of the displacement of the buttocks of the second dummy, a restraint system experiment is carried out, and if there is no collision between the dummy and the hard object in front, then the tested seat belt meets the dynamic performance requirements under the zero-gravity seat state.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows: The present application provides a dynamic test seat for seat belts. By setting the backrest, seat cushion, and leg rest to be rotatably connected to the base, the seat state can be adjusted, enabling the seat to be adjusted to a standard seat state or a zero-gravity seat state. In cooperation with the first locking component and the second locking component, the locking is reliable, the occupied space is small, and interference during the subsequent installation of the seat belt on the actual vehicle is avoided.

[0026] The present application also provides a dynamic test method for seat belts. Even when the occupant adopts the zero-gravity seat state, the restraint ability of the seat belt can be well tested, improving the dynamic test method for seat belts and ensuring that the occupant can receive good protection in different sitting postures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the dynamic test seat for seat belts provided by the embodiment of the present application;

[0028] Figure 2 It is a schematic connection structure diagram of the seat cushion and the backrest with the base provided by the embodiment of the present application;

[0029] Figure 3 It is a schematic connection structure diagram of the leg rest and the seat cushion provided by the embodiment of the present application;

[0030] Figure 4 It is a schematic structural diagram of the first locking screw provided by the embodiment of the present application;

[0031] Figure 5 It is a schematic structural diagram of the second locking screw provided by the embodiment of the present application;

[0032] Figure 6 It is a schematic diagram of the standard seat condition state of the dynamic test seat for seat belts provided by the embodiment of the present application;

[0033] Figure 7 It is a schematic diagram of the zero-gravity seat condition state of the dynamic test seat for seat belts provided by the embodiment of the present application;

[0034] Figure 8 It is a flowchart of the dynamic test method for seat belts provided by the embodiment of the present application;

[0035] The text markings in the figure are indicated as:

[0036] 1. Base; 2. Backrest; 3. Seat cushion; 4. Leg rest;

[0037] 5. First locking component; 51. First locking screw; 511. First fixing part; 512. First connecting part; 513. Second fixing part; 514. Second connecting part; 515. Third fixing part; 516. Limiting part; 52. First locking nut;

[0038] 6. Second locking assembly; 61. Second locking screw; 611. Fourth fixing part; 612. Third connecting part; 613. Fifth fixing part; 62. Second locking nut;

[0039] 7. Support base. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative efforts shall fall within the scope protected by the present invention.

[0041] It should be noted that the terms used in the present invention are only for describing specific embodiments and do not limit the scope of the present application. As shown in the specification of the present invention, unless the context clearly indicates an exception, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include the plural. The term "comprise", "include" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method or device including a series of elements not only includes those elements but also other elements not expressly listed, or further includes elements inherent to such process, method or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method or device including the said element.

[0042] As Figure 1-7 shown, the present application provides a seat for dynamic testing of seat belts, which includes a base 1, a backrest 2, a seat cushion 3 and a leg rest 4. The backrest 2 is rotatably connected to the base 1; one end of the seat cushion 3 is rotatably connected to the base 1, and the other end is rotatably connected to the leg rest 4. The angles between the backrest 2 and the base 1, the seat cushion 3 and the base 1, and the leg rest 4 and the seat cushion 3 are adjusted to enable the seat to meet the requirements of a standard seat ( Figure 6 shown) and a zero-gravity seat ( Figure 7 ).

[0043] The seat for dynamic testing of seat belts provided by this application further includes a first locking component 5 and a second locking component 6. The first locking component 5 includes a first locking screw 51 and a first locking nut 52. The first locking screw 51 can pass through the backrest 2 and the seat cushion 3 and is threadedly connected to the backrest 2 and the seat cushion 3. The first locking nut 52 is threadedly connected to the first locking screw 51 for fixing the backrest 2 and the seat cushion 3. The second locking component 6 includes a second locking screw 61 and a second locking nut 62. The second locking screw 61 can pass through the leg rest 4 and the seat cushion 3. The second locking nut 62 is threadedly connected to the second locking screw 61 for fixing the leg rest 4 and the seat cushion 3. This locking method is reliable in locking and occupies less space, avoiding interference during subsequent installation of the seat belt at the actual vehicle position.

[0044] The first locking screw 51 has a plurality of fixing parts and a plurality of connecting parts arranged in sequence. The connecting parts include a first connecting part 512 and a second connecting part 514. The backrest 2 is connected to the first connecting part 512, and the seat cushion 3 is connected to the second connecting part 514. The first locking nut 52 is connected to the fixing part to limit the backrest 2 and the seat cushion 3. Both ends of the first locking screw 51 are also provided with limiting parts 516. The cross-section of the limiting parts 516 is a square structure to prevent deflection.

[0045] As Figure 4 shown, the first locking screw 51 provided in this embodiment specifically includes a first limiting part, a first fixing part 511, a first connecting part 512, a second fixing part 513, a second connecting part 514, a third fixing part 515, and a second limiting part connected in sequence. The backrest 2 is threadedly connected to the first connecting part 512, and the first locking nut 52 connected to the first fixing part 511 and the second fixing part 513 is used to fix the backrest 2. The seat cushion 3 is threadedly connected to the second connecting part 514, and the first locking nut 52 connected to the second fixing part 513 and the third fixing part 515 is used to fix the seat cushion 3.

[0046] Furthermore, the thread direction of the fixing part is opposite to that of the connecting part. In this embodiment, the first connecting part 512 and the second connecting part 514 are right-handed threads, and the first fixing part 511, the second fixing part 513, and the third fixing part 515 are left-handed threads. The reverse-thread fastening method is used for locking. Compared with other fixing methods, it has reliable locking and occupies less space.

[0047] Each first locking nut 52 includes a first part and a second part. The first part is provided with an internal thread for threaded connection with the first locking screw 51. The second part has a through hole with an inner diameter larger than the outer diameter of the first locking screw 51. The through hole can pass through the first locking screw 51 so that the second part presses against the backrest 2 or the seat cushion 3 to be fixed, further reducing the offset of the backrest 2 and the seat cushion 3.

[0048] As Figure 5As shown, the second locking screw 61 is substantially the same as the first locking screw 51, including a plurality of fixing parts and connecting parts, wherein the connecting part is used to connect the leg rest 4. Specifically, the second locking screw 61 provided in this embodiment specifically includes a third limiting part, a fourth fixing part 611, a third connecting part 612, a fifth fixing part 613 and a fourth limiting part connected in sequence. The leg rest 4 is threadedly connected to the third connecting part 612, and the second locking nut 62 connected to the fourth fixing part 611 and the fifth fixing part 613 is used to fix the leg rest 4. The third connecting part 612 has a right-handed thread, and the fourth fixing part 611 and the fifth fixing part 613 have left-handed threads, and are locked by a reverse thread fastening method. Compared with other fixing methods, it has reliable locking and less occupied space. Similarly, the structure of each second locking nut 62 is the same as that of the first locking nut 52, and will not be elaborated here.

[0049] The seat belt dynamic test seat provided in this embodiment further includes a support seat 7. The support seat 7 is placed under the seat cushion 3 and is rotatably connected to the seat cushion 3 through a connecting rod. One section of the connecting rod is rotatably connected to the seat cushion 3, and the other end is rotatably connected to the connecting part on the support seat 7. The connection position between the connecting part and the bottom of the support seat 7 is adjustable, so as to realize the function of the support seat 7 supporting the seat cushion 3, and at the same time does not affect the rotation angle of the seat cushion 3.

[0050] As Figure 8 shown, this embodiment also provides a seat belt dynamic test method, using the seat belt dynamic test seat as described above. The method includes:

[0051] Adjust the angle between the backrest 2 and the seat cushion 3 to the first preset angle range. When the dummy is in the standard sitting posture, fasten the seat belt and then conduct a dynamic test to obtain the first set of evaluation indicators. Judge whether the first set of evaluation indicators are all less than the corresponding first set of preset safety values. If the first set of evaluation indicators are all less than the corresponding first set of preset safety values, the seat belt under test meets the dynamic performance requirements in the standard seat state;

[0052] Adjust the angle between the backrest 2 and the seat cushion 3 and the angle between the seat cushion 3 and the leg rest 4 to make the dummy in the zero-gravity sitting posture. Fasten the seat belt and then conduct a dynamic test to obtain the second set of evaluation indicators. Judge whether the second set of evaluation indicators are all less than the corresponding second set of preset safety values. If the second set of evaluation indicators are all less than the corresponding second set of preset safety values, the seat belt under test meets the dynamic performance requirements in the zero-gravity seat state;

[0053] If the seat belt under test meets the dynamic performance requirements in the standard seat state and meets the dynamic performance requirements in the zero-gravity seat state, the seat belt under test is qualified.

[0054] Specifically, the first set of evaluation indicators includes at least the displacement of the chest of the first dummy and the displacement of the buttocks of the first dummy. Correspondingly, the first set of preset safety values includes at least the preset safety value of the chest displacement of the first dummy and the preset safety value of the buttocks displacement of the first dummy.

[0055] If the displacement of the buttocks of the first dummy is less than the preset safety value of the buttocks displacement of the first dummy and the displacement of the chest of the first dummy is less than the preset safety value of the chest displacement of the first dummy, the measured seat belt meets the dynamic performance requirements under the standard seat condition; if the displacement of the buttocks of the first dummy is greater than the preset safety value of the buttocks displacement of the first dummy, the measured seat belt does not meet the dynamic performance requirements under the standard seat condition. If the displacement of the buttocks of the first dummy is less than the preset safety value of the buttocks displacement of the first dummy and the displacement of the chest of the first dummy is greater than the preset safety value of the chest displacement of the first dummy, further verification is carried out in the following situations.

[0056] When measuring the performance of the rear seat belt, a restraint system experiment is carried out. If there is no collision between the rear dummy and the hard object in front, the measured seat belt meets the dynamic performance requirements under the standard seat condition; when measuring the performance of the front seat belt, the first set of evaluation indicators further includes the real-time speed of the dummy's chest. Correspondingly, the first set of preset safety values further includes the preset safety value of the real-time speed of the dummy's chest. If the real-time speed of the dummy's chest is less than the preset safety value of the real-time speed of the dummy's chest, the measured seat belt meets the dynamic performance requirements under the standard seat condition; if the real-time speed of the dummy's chest is greater than the preset safety value of the real-time speed of the dummy's chest, a restraint system experiment is carried out. If there is no collision between the front dummy and the hard object in front, the measured seat belt meets the dynamic performance requirements under the standard seat condition.

[0057] Specifically, the second set of evaluation indicators includes at least the displacement of the chest of the second dummy, the displacement of the buttocks of the second dummy, the shoulder belt force, and the waist belt force. At present, there is no unified regulation on the evaluation indicators under the zero-gravity seat condition in the industry. In this embodiment, the above four evaluation indicators are selected, and appropriate indicators can be incorporated into the second set of evaluation indicators according to the industry research situation in the future. Correspondingly, the second set of preset safety values includes at least the preset safety value of the chest displacement of the second dummy, the preset safety value of the buttocks displacement of the second dummy, the shoulder belt force safety value, and the waist belt force safety value. When confirming the second set of preset safety values, it can be obtained through CAE simulation or obtained according to the experimental results by designing a test matrix.

[0058] This embodiment provides a setting scheme for the test matrix. The test method is a 50 km / h trolley simulated frontal collision test. During the entire collision process, only the seat belt restricts the dummy. By changing the force-limiting value of the seat belt or the maximum value of each evaluation indicator in the second set of evaluation indicators, the second set of preset safety values can be obtained.

[0059] If the displacement of the second dummy's chest is less than the preset safety value of the second dummy's chest displacement, the displacement of the second dummy's hip is less than the preset safety value of the second dummy's hip displacement, the shoulder belt force is less than the shoulder belt force safety value, and the waist belt force is less than the waist belt force safety value, then the tested seat belt meets the dynamic performance requirements in the zero-gravity seat state; if the shoulder belt force is greater than the shoulder belt force safety value and / or the waist belt force is greater than the waist belt force safety value, then the tested seat belt does not meet the dynamic performance requirements in the zero-gravity seat state; if the belt force is less than the shoulder belt force safety value, the waist belt force is less than the waist belt force safety value, the displacement of the second dummy's chest is greater than the corresponding preset safety value of the second dummy's chest displacement and / or the displacement of the second dummy's hip is greater than the preset safety value of the second dummy's hip displacement, a restraint system experiment is further carried out. If there is no collision between the dummy and the hard object in front, then the tested seat belt meets the dynamic performance requirements in the zero-gravity seat state.

[0060] The seat belt dynamic test method provided by this application can better test the restraint ability of the seat belt even when the occupant is in the zero-gravity seat state, improves the seat belt dynamic test method, and ensures that the occupant can receive good protection in different sitting postures.

[0061] Among them, before the test, the first set of preset safety values and the second set of preset safety values can be determined through the restraint system layout scheme of the developed vehicle model. Eight sets of seat belt assemblies are selected as test samples, and dynamic pre-aging treatment is carried out on test samples No. 1-8, including: retractor durability, buckle durability, salt spray test, dust test, etc. Test samples No. 1-2 are subjected to dynamic performance tests in the standard seat state to judge whether the displacement of the first dummy's hip is less than the preset safety value of the first dummy's hip displacement and whether the displacement of the first dummy's chest is less than the preset safety value of the first dummy's chest displacement. If it is satisfied, it meets the dynamic performance requirements in the standard seat state. If it is not satisfied, then test samples No. 3-4 are used for the restraint system experiment. If the restraint system result meets the requirements, it is determined to meet the dynamic performance requirements in the standard seat state. If the restraint system does not meet the requirements, it is determined to be unqualified. Test samples No. 5-6 are subjected to dynamic performance tests in the zero-gravity seat state to judge whether the displacement of the second dummy's chest is less than the preset safety value of the second dummy's chest displacement, whether the displacement of the second dummy's hip is less than the preset safety value of the second dummy's hip displacement, whether the shoulder belt force is less than the shoulder belt force safety value, and whether the waist belt force is less than the waist belt force safety value. If it is satisfied, it meets the dynamic performance requirements in the zero-gravity seat state. If it does not meet the requirements, test samples No. 7-8 are used for restraint system verification. If the restraint system result meets the requirements, it is determined to meet the dynamic performance requirements in the zero-gravity seat state. If the restraint system does not meet the requirements, it is determined to be unqualified.

[0062] If the seat belt meets the dynamic requirements in both the standard seat state and the zero-gravity seat state at the same time, it is determined that the seat belt meets the development requirements of this vehicle model and is a qualified product.

[0063] It should also be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. Unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A seat belt dynamic testing method, characterized in that: The method adopts a seat belt dynamic test seat, and the seat belt dynamic test seat comprises: Base (1), A backrest (2), the backrest (2) being rotatably connected to the base (1); A seat cushion (3), one end of the seat cushion (3) being rotatably connected to the base (1), and the other end of the seat cushion (3) being rotatably connected to a leg support (4); A first locking assembly (5), the first locking assembly (5) comprising a first locking screw (51) and a first locking nut (52), the first locking screw (51) being capable of passing through the backrest (2) and the seat cushion (3) and being threadedly connected to the backrest (2) and the seat cushion (3), the first locking nut (52) being threadedly connected to the first locking screw (51) and being used to fix the backrest (2) and the seat cushion (3); a second locking assembly (6), the second locking assembly (6) comprising a second locking screw (61) and a second locking nut (62), the second locking screw (61) being capable of passing through the leg support (4) and the seat cushion (3), the second locking nut (62) being threadedly connected to the second locking screw (61) for fixing the leg support (4) and the seat cushion (3), The method comprises: The angle between the backrest (2) and the seat cushion (3) is adjusted to a first preset angle range, the dummy is in a standard sitting position, and a dynamic test is performed after the seat belt is fastened, a first group of evaluation indicators are obtained, and it is determined whether the first group of evaluation indicators are all less than the corresponding first group of preset safety values. If the first group of evaluation indicators are all less than the corresponding first group of preset safety values, then the tested seat belt meets the dynamic performance requirements under the standard seat state; Adjusting the angle between the backrest (2) and the seat cushion (3), and adjusting the angle between the seat cushion (3) and the leg support (4), so that the dummy is in a zero-gravity sitting posture, and performing a dynamic test after fastening the seat belt to obtain a second group of evaluation indicators, and judging whether the second group of evaluation indicators are all less than the corresponding second group of preset safety values. If the second group of evaluation indicators are all less than the corresponding second group of preset safety values, then the tested seat belt meets the dynamic performance requirements in the zero-gravity seat state; If the seat belt under test meets the dynamic performance requirements in the standard seat state and meets the dynamic performance requirements in the zero-gravity seat state, the seat belt under test is qualified.

2. The seat belt dynamic testing method according to claim 1, characterized in that: The first group of evaluation indicators at least includes a first dummy chest displacement and a first dummy hip displacement, and the first group of preset safety values ​​at least includes a first dummy chest displacement preset safety value and a first dummy hip displacement preset safety value.

3. The seat belt dynamic testing method according to claim 2, characterized in that: The first group of evaluation indicators also includes the real-time speed of the dummy chest, and the first group of preset safety values ​​also includes the preset safety value of the real-time speed of the dummy chest; The first dummy hip displacement of the front row dummy is less than the first dummy hip displacement preset safety value, and the first dummy chest displacement is greater than the first dummy chest displacement preset safety value. If the real-time speed of the dummy chest is less than the real-time speed preset safety value, the tested seat belt meets the dynamic performance requirements under the standard seat state; if the real-time speed of the dummy chest is greater than the real-time speed preset safety value, a restraint system test is performed, and the dummy does not collide with the hard object in front, then the tested seat belt meets the dynamic performance requirements under the standard seat state; The first dummy hip displacement of the rear dummy is less than the preset safety value of the first dummy hip displacement, and the first dummy chest displacement is greater than the preset safety value of the first dummy chest displacement. When the restraint system test is performed and the dummy does not collide with the hard object in front, the tested seat belt meets the dynamic performance requirements under the standard seat state.

4. The seat belt dynamic testing method according to claim 1, characterized in that: The second group of evaluation indicators at least includes the second dummy chest displacement, the second dummy hip displacement, the shoulder strap force and the waist belt force, and the second group of preset safety values ​​at least includes the second dummy chest displacement preset safety value, the second dummy hip displacement preset safety value, the shoulder strap force safety value and the waist belt force safety value.

5. The seat belt dynamic testing method according to claim 4, characterized in that: The shoulder strap force is less than the shoulder strap force safety value, and the waist belt force is less than the waist belt force safety value. If the sum of the second dummy's chest displacement or the second dummy's hip displacement is greater than the corresponding sum of the second dummy's chest displacement preset safety value or the second dummy's hip displacement preset safety value, a restraint system test is performed, and the dummy does not collide with the hard object in front, then the tested seat belt meets the dynamic performance requirements under the zero-gravity seat state.

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