Safety belt fixing point strength verification positioning device and method

Abstract

The invention discloses a safety belt fixing point strength verification positioning device and method. The device comprises a safety belt positioning clamp, the safety belt positioning clamp comprises two step-shaped steel plates, the two step-shaped steel plates are located on the two sides of an upper human body module and the two sides of a safety belt respectively and arranged in parallel at intervals, the safety belt is attached to the upper human body module, and the lower portions of the two step-shaped steel plates and the upper human body module are jointly connected through a first steel bar; the upper portions of the two step-shaped steel plates are connected through a second steel bar, and the part, located between the two step-shaped steel plates, of the second steel bar is a hook connecting part. The problem of simulation and test consistency of safety belt fixing point strength verification is solved, and the problem that early-stage verification of a design scheme is insufficient or later-stage scheme verification fails due to inconsistent verification methods is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile safety belt strength verification, and in particular relates to a safety belt fixing point strength verification and positioning device and method. Background Art

[0002] As an important means of transportation, the safety of automobiles is one of the most critical performances. Among them, seat belts are the most important passenger protection system and play an important role in reducing casualties. Therefore, the strength of the seat belt fixing points must be fully considered during the design phase of the automobile and must pass the test of the national standard GB14167 before formal production.

[0003] In the process of vehicle development, a combination of simulation and testing is generally used to verify the strength of seat belt anchor points. In the early design stage, simulation models are used for strength verification and improvement, and after the trial vehicle is completed, the actual vehicle is used for verification. How to ensure the consistency of simulation and testing and ensure that the two can verify each other is a problem that needs to be solved.

[0004] For example, patent CN113850003A provides a finite element analysis optimization method for seat belt fixing point strength, and publishes the general process and method of seat belt fixing point strength simulation analysis, which is divided into 4 steps, namely model building, model optimization, result analysis, and end; but it does not describe in detail the rules for how to place the human body module and the constraint state of the human body module in the simulation. The initial position and angle difference of the human body module have an important influence on the test results, and if there are certain differences between the simulation and the test, the value of the preliminary evaluation will be lost or the test verification will be unrepresentative.

[0005] Another example is patent CN201611122558.2, which provides a test device for the strength of the fixed points of automobile seat belts and discloses a test device that uses hydraulic thrust for verification, which is different from the traditional tensile verification device. However, it does not involve simulation methods, and requires investment and modification of test equipment, which is costly. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide a safety belt fixing point strength verification and positioning device and method.

[0007] The technical solution adopted by the present invention is: a safety belt fixing point strength verification and positioning device, including a safety belt positioning fixture, the safety belt positioning fixture includes two step-shaped steel plates, the two step-shaped steel plates are respectively located on both sides of the upper human body module and the safety belt and are arranged in parallel and spaced apart, the safety belt is covered on the upper human body module, the lower parts of the two step-shaped steel plates and the upper human body module are connected together by a first steel rod, the upper parts of the two step-shaped steel plates are connected by a second steel rod, and the part of the second steel rod located between the two step-shaped steel plates is a hook connection part.

[0008] In a further preferred structure, the first steel rod passes through the two stepped steel plates and both ends extend out of the stepped steel plates.

[0009] In a further preferred structure, the second steel rod passes through the two stepped steel plates and both ends extend out of the stepped steel plates.

[0010] In a further preferred structure, the length of the first steel rod is greater than the length of the second steel rod.

[0011] A further preferred structure is that the stepped steel plate includes a first fixing part, a connecting part and a second fixing part, the first fixing part, the connecting part and the second fixing part are connected in sequence, the first fixing part is used to be fixed to a first steel rod, the second fixing part is used to be fixed to a second steel rod, and the connecting part is used to connect the first fixing part and the second fixing part.

[0012] In a further preferred structure, the distance between two of the first fixing parts is greater than the distance between two of the second fixing parts.

[0013] A method for verifying and locating a safety belt fixing point strength device, comprising the following steps:

[0014] Install the safety belt positioning fixture on the upper human body module, position the upper human body module and the safety belt as a whole, and rotate a certain angle from the vertical direction until the longitudinal central axis direction of the upper human body module is in the same plane as the D-Ring point and Buckle point of the safety belt, complete the connection of the fixed point of the safety belt, connect the hook connection part of the second steel bar to the iron chain model, preload the iron chain model with an initial force F0, tighten the safety belt positioning fixture and the iron chain model, keep a straight line, and apply a force F to the iron chain model in the direction specified for strength verification 极限 , 1g gravity is applied to the upper human body module, and the upper human body module finally reaches force balance, and the simulation strength verification begins.

[0015] Furthermore, the iron chain model is a force application module unit during simulation strength verification.

[0016] Furthermore, the value of F0 is 400N-600N.

[0017] Furthermore, the F 极限 Apply the maximum force that the seat belt anchorage point can withstand.

[0018] GB14167 clearly specifies the shapes and sizes of the upper and lower human body modules. Among them, because the lower human body module is placed on the seat, the hook can be directly connected to the loading point of the module, and a pulling force in a specified direction can be applied to the end of the hook for testing. The upper human body module is in a quasi-static equilibrium during the test. It is necessary to add a clamp to the module, apply a pulling force to the clamp, and form an overall balance of the three forces with the module gravity and the safety belt tension to complete the entire test. The present invention mainly clarifies a set of processes and methods for placing the upper human body module in a simulation and test environment using a clamp, which can make the simulation and test verification states consistent and ensure that the strength of the safety belt fixing point meets the national standard requirements.

[0019] Without changing the existing test equipment, the present invention can solve the problem of consistency between simulation and test for seat belt fixing point strength verification, avoid the problem of insufficient early verification of the design scheme or failure of later scheme verification due to inconsistent verification methods, and ensure that the scheme can pass the GB14167 requirements in one go.

[0020] The present invention designs a set of fixture solutions for seat belt fixed point testing without changing the existing test equipment. The fixture solution has the characteristics of simple structure, low cost, stability and reliability, and is convenient for simultaneous use of testing and simulation.

[0021] The simulation and test positioning method of the human body module of the present invention can solve the consistency problem of the strength verification of the safety belt fixing point, ensure the consistency of the verification accuracy, and avoid the problem of insufficient early verification of the design scheme or failure of late scheme verification caused by inconsistent verification methods between the test and the simulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the principle of the method of the present invention;

[0024] Figure 3 Schematic diagram of the loading force principle of an embodiment of the present invention.

[0025] In the figure, 1-upper human body module, 2-safety belt, 3-first steel rod, 4-second steel rod (41-hook connecting part), 5-step steel plate (51-first fixing part, 52-connecting part, 53-second fixing part). DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0027] Embodiment 1

[0028] like Figure 1 As shown, the present invention provides a safety belt fixing point strength verification and positioning device, including a safety belt positioning fixture, the safety belt positioning fixture includes two step steel plates 5, the two step steel plates 5 are respectively located on both sides of the upper human body module 1 and the safety belt 2 and are arranged in parallel and spaced apart, the safety belt 2 is attached to the upper human body module 1, the lower parts of the two step steel plates 5 and the upper human body module 1 are connected together by a first steel rod 3, the upper parts of the two step steel plates 5 are connected by a second steel rod 4, and the part of the second steel rod 4 located between the two step steel plates 5 is a hook connection part 41.

[0029] The first steel rod 3 passes through the two step-shaped steel plates 5 and both ends extend out of the step-shaped steel plates 5. The second steel rod 4 passes through the two step-shaped steel plates 5 and both ends extend out of the step-shaped steel plates 5. The length of the first steel rod 3 is greater than the length of the second steel rod 4.

[0030] The stepped steel plate 5 includes a first fixing portion 51, a connecting portion 52 and a second fixing portion 53. The first fixing portion 51, the connecting portion 52 and the second fixing portion 53 are connected in sequence. The first fixing portion 51 is used to be fixed to the first steel bar 3, the second fixing portion 53 is used to be fixed to the second steel bar 4, and the connecting portion 52 is used to connect the first fixing portion 51 and the second fixing portion 53. The distance between the two first fixing portions 51 is greater than the distance between the two second fixing portions 53.

[0031] Embodiment 2

[0032] like Figure 2 As shown, the present invention provides a method for verifying and locating a safety belt fixing point strength device, comprising the following steps:

[0033] Install the safety belt positioning fixture on the upper human body module 1, position the upper human body module 1 and the safety belt 2 as a whole, and rotate a certain angle from the vertical direction until the longitudinal central axis direction of the upper human body module 1 and the D-Ring point and Buckle point of the safety belt 2 are in the same plane ( Figure 2 ), complete the connection of the fixed point of the safety belt 2, connect the hook connection part 41 of the second steel bar 4 with the iron chain model, preload the iron chain model with an initial force F0, tighten the safety belt positioning fixture and the iron chain model, keep a straight line, and apply a force F to the iron chain model in the direction specified for strength verification. 极限 , 1g gravity is applied to the upper human body module 1, and the upper human body module 1 finally reaches force balance, and the simulation strength verification begins.

[0034] GB14167 clearly stipulates the size of the upper human module 1, but the loading force of the strength test of the fixed point of the safety belt 2 is achieved by using a hydraulic cylinder to drive the iron chain. Therefore, a set of safety belt positioning fixtures for connecting the iron chain model (bar unit) with the upper human module 1 is designed, which consists of two 1cm thick stepped steel plates 5 with holes, two first steel bars 3 with threads at the ends, a second steel bar 4 and four nuts. The structure is simple and easy to operate. When in use, the first steel bar 3 is passed through the wide end of the stepped steel plate 5 and the connection hole of the upper human module 1, and fixed with two nuts; the second steel bar 4 is passed through the narrow end of the stepped steel plate 5, and the two ends of the steel bar are fixed with nuts. The hook connection part 41 is used to connect the iron chain hook, and the steel plates on both sides are used for positioning to prevent the hook from sliding.

[0035] In the experiment, the upper human body module 1 is suspended under the combined action of the loading force, gravity, and seat belt tension, achieving a quasi-static balance. In order to ensure the consistency between the simulation and the experiment, it is necessary to establish an upper human body module 1 and a seat belt positioning fixture of the same size in the simulation model, and to clarify the positioning method. Research has found that in the simulation, the initial placement angle of the upper human body module 1 has an important influence on its rapid balance and the smooth progress of the simulation analysis. The specific steps are as follows:

[0036] Establish kinematic pair: According to the actual situation, the first steel rod 3, the second steel rod 4 and the safety belt positioning fixture are fixedly connected and move as a whole. Establish a rotational kinematic pair between the safety belt positioning fixture and the upper human body module 1, and the direction of the rotation axis is consistent with the first steel rod 3 and the second steel rod 4.

[0037] Module angle confirmation: Take the upper body module 1 and the safety belt positioning fixture as a whole, and rotate them a certain angle from the vertical direction until the longitudinal center axis direction of the upper body module 1 is in the same plane with the D-Ring point and Buckle point of the safety belt.

[0038] Seat belt modeling: Establish a seat belt model along the upper human body module 1, and complete the fixed point connection and seat belt inspection to ensure that the seat belt has no defects such as wrinkles and rolling.

[0039] Load application: Figure 3 As shown, connect the second steel bar 4 with the chain model (bar unit), preload a force of 500N (perpendicular to the plane where the line connecting the D-Ring point and the Buckle point is located, and at an angle of 10°±5° to the horizontal plane), so that the safety belt positioning fixture and the chain model are tightened to maintain a straight line. Finally, apply a force of 13500N to the chain model in the specified direction (perpendicular to the plane where the line connecting the D-Ring point and the Buckle point is located, and at an angle of 10°±5° to the horizontal plane), and apply a gravity of 1g to the upper human body module 1. The module finally reaches a force balance, and the simulation strength verification can be officially started.

[0040] During the test, the chain model and the safety belt 2 can be connected to the upper human body module 1 first, and then the upper human body module 1 is placed in a position on the same plane as the D-Ring point and Buckle point of the safety belt, and a tension of 500N is applied. After the upper human body module 1 overcomes gravity and gradually stabilizes, a tension of 13500N can be loaded to officially start the test.

[0041] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A safety belt fixing point strength verification and positioning device, characterized in that: The invention comprises a safety belt positioning fixture, wherein the safety belt positioning fixture comprises two stepped steel plates (5), the two stepped steel plates (5) are respectively located on both sides of an upper human body module (1) and a safety belt (2) and are arranged in parallel and spaced apart, the safety belt (2) is attached to the upper human body module (1), the lower parts of the two stepped steel plates (5) and the upper human body module (1) are connected together by a first steel rod (3), the upper parts of the two stepped steel plates (5) are connected by a second steel rod (4), and the part of the second steel rod (4) located between the two stepped steel plates (5) is a hook connection part (41).

2. A safety belt fixing point strength verification and positioning device according to claim 1, characterized in that: The first steel rod (3) passes through the two stepped steel plates (5) and has two ends extending out of the stepped steel plates (5).

3. A safety belt fixing point strength verification and positioning device according to claim 1, characterized in that: The second steel rod (4) passes through the two stepped steel plates (5) and has two ends extending out of the stepped steel plates (5).

4. A safety belt fixing point strength verification and positioning device according to claim 1, characterized in that: The length of the first steel rod (3) is greater than the length of the second steel rod (4).

5. A safety belt fixing point strength verification and positioning device according to claim 1, characterized in that: The stepped steel plate (5) comprises a first fixing portion (51), a connecting portion (52) and a second fixing portion (53); the first fixing portion (51), the connecting portion (52) and the second fixing portion (53) are connected in sequence; the first fixing portion (51) is used to be fixed to a first steel rod (3); the second fixing portion (53) is used to be fixed to a second steel rod (4); and the connecting portion (52) is used to connect the first fixing portion (51) and the second fixing portion (53).

6. A safety belt fixing point strength verification and positioning device according to claim 5, characterized in that: The distance between the two first fixing portions (51) is greater than the distance between the two second fixing portions (53).

7. A method for verifying and locating a safety belt fixing point strength according to claim 1, characterized in that: The following steps are involved: The safety belt positioning fixture is installed on the upper human body module (1), and the upper human body module (1) and the safety belt (2) are positioned as a whole. The upper human body module (1) and the safety belt (2) are rotated at a certain angle from the vertical direction until the longitudinal central axis direction of the upper human body module (1) and the D-Ring point and Buckle point of the safety belt (2) are in the same plane, and the fixed point connection of the safety belt (2) is completed. The hook connection part (41) of the second steel rod (4) is connected to the iron chain model, and the iron chain model is preloaded with an initial force F0, so that the safety belt positioning fixture and the iron chain model are tightened and kept in a straight line, and a force F is applied to the iron chain model in the direction specified for strength verification. 极限 , a gravity of 1g is applied to the upper human body module (1), and the upper human body module (1) finally reaches a force balance, and the simulation strength verification begins.

8. A method for verifying and locating a safety belt fixing point strength according to claim 7, characterized in that: The iron chain model is a force application module unit during simulation strength verification.

9. A method for verifying and locating a safety belt fixing point strength according to claim 7, characterized in that: The value of F0 is 400N-600N.

10. A method for verifying and locating a safety belt fixing point strength according to claim 7, characterized in that: The F 极限 Apply force to the maximum limit that the seat belt anchorage point can withstand.

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