Rigidity and fatigue testing device for front-end framework of flexible automobile

Abstract

The invention relates to a rigidity and fatigue testing device for a flexible automobile front-end framework. The rigidity and fatigue testing device comprises a first testing rack (1) and a second testing rack (2) which are arranged in parallel, the automobile front-end framework is mounted on one side, facing the second test bench (2), of the first test bench (1); the first test bench (1) is provided with a plurality of pneumatic loading mechanisms (4) used for carrying out a fatigue test and a rigidity test on the automobile front end framework (3). The second test bench (2) is provided with a plurality of electric loading mechanisms (5) used for carrying out a fatigue test and a rigidity test on the automobile front end framework. And the loading ends of the pneumatic loading mechanism (4) and the electric loading mechanism (5) abut against a to-be-tested point of the automobile front-end framework. Compared with the prior art, a plurality of pneumatic loading mechanisms and electric loading mechanisms are arranged in the rigidity and fatigue testing device for the front-end framework of the flexible automobile, so that synchronous amp can be realized; the fatigue amp of a non-synchronous force value; and rigidity loading.

Description

Technical Field

[0001] The invention relates to the field of mechanical performance testing of vehicle components, and in particular to a flexible automobile front end frame fatigue testing device. Background Art

[0002] As a load-bearing component, the front frame of the car needs to bear the gravity of various electrical components; and when the front cover of the car is opened and closed, the front frame of the car will bear the corresponding impact force. This requires the front frame assembly of the car to have corresponding fatigue resistance to better ensure that it maintains integrity within a certain number of impact forces. In order to better obtain the fatigue resistance of the front frame of the car made of different materials, it is necessary to design corresponding equipment to simulate the fatigue resistance of the front frame of the car.

[0003] The existing technology can only perform single-point stiffness loading, and cannot perform fatigue loading tests or multi-point synchronous and asynchronous loading. In addition, the device is immovable and cannot be moved to a high or low temperature environment box for use. Summary of the invention

[0004] The purpose of the present invention is to provide a flexible automobile front end frame stiffness and fatigue testing device in order to overcome at least one of the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A flexible automobile front frame stiffness and fatigue testing device comprises a first test bench and a second test bench arranged in parallel; the automobile front frame is installed on the side of the first test bench facing the second test bench;

[0007] The first test bench is equipped with multiple pneumatic loading mechanisms for fatigue and stiffness tests on the front frame of the car; the second test bench is equipped with multiple electric loading mechanisms for fatigue and stiffness tests on the front frame of the car; the test ends of the pneumatic loading mechanisms and electric loading mechanisms are in contact with the test points of the front frame of the car. Among them, the pneumatic loading mechanism focuses on fatigue and stiffness tests of fixed test points; the electric loading mechanism is located on the second test bench, and the electric loading points can be flexibly adjusted according to the different test points to achieve the reuse of the electric loading mechanism.

[0008] Furthermore, the pneumatic loading mechanism comprises a cylinder, and a sensor and an adapter which are sequentially arranged at the loading end of the cylinder, wherein the adapter is used to point to the loading end of the front frame of the automobile.

[0009] Furthermore, the pneumatic loading mechanism can be arranged on the first test bench according to the selection of the front frame of the automobile. In some embodiments of the present invention, a variety of connectors are arranged according to the needs of the installation of the pneumatic loading mechanism.

[0010] Furthermore, the loading accuracy of the cylinder is 0.05mm, the loading stroke is 0-50mm, and the operating temperature is -30 to +90°C.

[0011] Furthermore, the electric loading mechanism includes an electric cylinder, and a sensor and an adapter which are sequentially arranged at the loading end of the electric cylinder, wherein the adapter is used to point to the loading end of the front frame of the automobile.

[0012] Furthermore, the loading accuracy of the electric cylinder is less than ±2%, the stroke is 0-250 mm, and the working temperature is -30 to +90° C. In addition, the loading speed is 1.0 Hz and can be adjusted.

[0013] Furthermore, the electric loading mechanism is arranged in parallel on the second test bench and slides up and down along the slide rails arranged on the second test bench. In one embodiment of the present application, multiple electric loading mechanisms are arranged in parallel on the moving beam and move along with the moving beam moving up and down.

[0014] More specifically, the electric loading mechanism can rotate freely and be locked along the Z axis, can move freely forward and backward along the Z axis and can be locked, can rotate freely and be locked along the X axis, or can move freely and controllably up and down along the Y axis.

[0015] Furthermore, the sensor includes a force sensor and a displacement sensor.

[0016] Furthermore, the force sensor has an accuracy of ±0.1% FS, a force range of 1-5 kN, and an operating temperature of -30 to +90° C. Preferably, the force can be 1 KN, 2 KN or 5 KN.

[0017] Furthermore, the displacement range of the displacement sensor is 0-50 mm, the accuracy is ±0.05 mm, the resolution is 0.5 μm, and the sampling period is 1 ms.

[0018] Furthermore, there are 1 to 5 pneumatic loading mechanisms; and there are 1 to 3 electric loading mechanisms.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] (1) The flexible automobile front frame stiffness and fatigue testing device designed by the present invention is provided with multiple pneumatic loading mechanisms and electric loading mechanisms, which can realize fatigue and stiffness loading of synchronous and asynchronous force values;

[0021] (2) The pneumatic loading mechanism and the electric loading mechanism in the flexible automobile front frame stiffness and fatigue testing device designed by the present invention can withstand working in a working environment of -30 to +90°C, and can realize stiffness and fatigue testing of the automobile front frame under high and low temperature conditions;

[0022] (2) The flexible automobile front frame stiffness and fatigue testing device designed by the present invention is light in weight and easy to move, and can be easily moved to any steel platform position to carry out loading tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the device designed for the present invention;

[0024] Figure 2 This is a schematic diagram of the front end frame of the automobile after assembly in Example 1;

[0025] Figure 3 This is a schematic diagram of the selection of the loading points of the front frame of the automobile in Example 1;

[0026] Figure 4 This is a schematic diagram of the front end frame of the automobile after assembly in Example 2;

[0027] Figure 5 This is a schematic diagram of the selection of the loading points of the front frame of the automobile in Example 2;

[0028] Figure 6 Schematic diagram of the electric loading mechanism in Examples 1 and 2;

[0029] Figure 7 It is a schematic diagram of the electric loading mechanism rotating along the Z axis in Examples 1 and 2;

[0030] Figure 8 It is a schematic diagram of the electric loading mechanism in Examples 1 and 2 moving forward and backward along the Z axis and freely rotating along the X axis;

[0031] Fig. 9 It is a schematic diagram of the electric loading mechanism moving up and down along the Y axis in Examples 1 and 2;

[0032] Fig.10 The connecting piece designed by the user in Examples 1 and 2 for connecting the pneumatic loading mechanism;

[0033] Numbers in the figure indicate: 1-first test bench; 2-second test bench; 3-front end frame of the vehicle; 4-pneumatic loading mechanism; 5-electric loading mechanism; 6-movable crossbeam. DETAILED DESCRIPTION

[0034] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0035] Example 1

[0036] A flexible automobile front frame stiffness and fatigue testing device, see Figure 1 , 2 , including a first test bench 1 and a second test bench 2 arranged in parallel; the front end frame of the automobile is installed on the side of the first test bench 1 facing the second test bench 2; the first test bench 1 is provided with a plurality of pneumatic loading mechanisms 4 for performing fatigue tests and stiffness tests on the front end frame 3 of the automobile; the second test bench 2 is provided with a plurality of electric loading mechanisms 5 relative to the pneumatic loading mechanisms 4 and for performing fatigue tests and stiffness tests on the front end frame of the automobile. In this embodiment, there are 3 pneumatic loading mechanisms 4 and 3 electric loading mechanisms 5. Because both the pneumatic loading mechanisms 4 and the electric loading mechanisms 5 in this embodiment can be moved, the number of loading points is greater than or equal to the sum of the number of pneumatic loading mechanisms 4 and electric loading mechanisms 5, such as Figure 3 As shown, the arrow in the figure is the loading point.

[0037] The pneumatic loading mechanism 4 includes a cylinder, and a sensor and an adapter which are sequentially arranged at the loading end of the cylinder. The loading accuracy of the cylinder is 0.05mm, the loading stroke is 0-50mm, and the working temperature is -30~+90℃.

[0038] Electric loading mechanism 5, see Figure 6-9 , electric cylinder 5-1, and sensor 5-2 and adapter 5-3 arranged at the loading end of the electric cylinder in sequence. The loading accuracy of the electric cylinder is <±2%, the stroke is 0-250mm, and the working temperature is -30~+90℃. The electric loading mechanism is arranged in parallel on the moving beam 6, and moves with the up and down movement of the moving beam 6. The electric loading mechanism can rotate freely and lock along the Z axis, can move freely forward and backward along the Z axis and can be locked, can rotate freely and lock along the X axis, or can move freely and controllably up and down along the Y axis.

[0039] The electric loading mechanism 5 is arranged in parallel on the second test bench 2 , and slides up and down along a slide rail provided on the second test bench 2 .

[0040] The sensors in the pneumatic loading mechanism 4 and the electric loading mechanism 5 include a force sensor and a displacement sensor. The accuracy of the force sensor is ±0.1% FS, the force range is 1-5kN, and the operating temperature is -30~+90℃. The displacement range of the displacement sensor is 0-50mm, the accuracy is ±0.05mm, the resolution is 0.5μm, and the sampling period is 1ms.

[0041] Working principle:

[0042] In this embodiment, after the front-end frame 3 of the automobile is installed on the first test bench 1 according to the entrustment of the OEM, the pneumatic loading mechanism 4 and the electric loading mechanism 5 are installed according to the requirements of the OEM and the points where the stiffness and fatigue tests are required. Among them, the base of the electric loading mechanism 5 can be fine-tuned and rotated in three directions of X, Y, and Z to achieve fine-tuning settings after the large position is confirmed, so that it can reach the specified required position more accurately.

[0043] When performing a stiffness test, the adapters of the pneumatic loading mechanism 4 and the electric loading mechanism 5 need to be brought into contact with the test point, and then loaded until the force sensor reaches the test value, and the test time is waited for. If the force sensor does not show a change in reading, the stiffness test of the front frame 3 of the vehicle passes, otherwise it means that the stiffness test fails. The fatigue test is a stiffness test performed for a specified number of times. If the force sensor reading changes after completing the specified number of times, it means that the fatigue test fails, otherwise it passes.

[0044] Example 2

[0045] Implementation Example 2 is basically the same as Implementation Example 1, except that the selection of the test points in this embodiment is different from that in the implementation example, so the installation of the pneumatic loading mechanism 4 in this embodiment is also different from that in Implementation Example 1.

[0046] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A flexible automobile front frame stiffness and fatigue testing device, characterized in that: It comprises a first test bench (1) and a second test bench (2) arranged in parallel; the front end frame of the automobile is installed on the side of the first test bench (1) facing the second test bench (2); The first test bench (1) is provided with a plurality of pneumatic loading mechanisms (4) for performing fatigue tests and stiffness tests on the front end frame (3) of the automobile; the second test bench (2) is provided with a plurality of electric loading mechanisms (5) for performing fatigue tests and stiffness tests on the front end frame of the automobile; The loading ends of the pneumatic loading mechanism (4) and the electric loading mechanism (5) are in contact with the points to be tested on the front frame of the automobile.

2. A flexible automobile front frame stiffness and fatigue testing device according to claim 1, characterized in that: The pneumatic loading mechanism (4) comprises a cylinder, and a sensor and a switching joint which are sequentially arranged at the loading end of the cylinder.

3. A flexible automobile front frame stiffness and fatigue testing device according to claim 2, characterized in that: The loading accuracy of the cylinder is 0.05mm, the loading stroke is 0-50mm, and the working temperature is -30 to +90°C.

4. A flexible automobile front frame stiffness and fatigue testing device according to claim 1, characterized in that: The electric loading mechanism (5) comprises an electric cylinder (5-1), and a sensor (5-2) and an adapter (5-3) which are sequentially arranged at the loading end of the electric cylinder.

5. A flexible automobile front end frame stiffness and fatigue testing device according to claim 4, characterized in that: The loading accuracy of the electric cylinder is less than ±2%, the stroke is 0-250mm, and the working temperature is -30 to +90°C.

6. A flexible automobile front frame stiffness and fatigue testing device according to claim 1, characterized in that: The electric loading mechanism (5) is arranged in parallel on the second test bench (2) and slides up and down along a slide rail provided on the second test bench (2).

7. A flexible automobile front frame stiffness and fatigue testing device according to claim 2 or 4, characterized in that: The sensor comprises a force sensor and a displacement sensor.

8. A flexible automobile front frame stiffness and fatigue testing device according to claim 7, characterized in that: The force sensor has an accuracy of ±0.1% FS, a force range of 1-5 kN, and an operating temperature of -30 to +90°C.

9. A flexible automobile front frame stiffness and fatigue testing device according to claim 7, characterized in that: The displacement sensor has a displacement range of 0-50 mm, an accuracy of ±0.05 mm, a resolution of 0.5 μm, and a sampling period of 1 ms.

10. A flexible automobile front frame stiffness and fatigue testing device according to claim 7, characterized in that: The number of the pneumatic loading mechanisms (4) is 1 to 5; the number of the electric loading mechanisms (5) is 1 to 3.

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