Fatigue test fixture for cross-shaped sample

Abstract

The utility model relates to the technical field of sample testing, and discloses a cross-shaped sample fatigue test fixture which comprises two chucks, and is characterized in that gaskets are arranged on the outer walls of the chucks, stabilizing assemblies are arranged in the chucks, adjusting assemblies are arranged at the tops of the chucks, and the adjusting assemblies are arranged on the outer walls of the chucks. The stabilizing assembly comprises a first nut and a second nut, the outer wall of the first nut and the outer wall of the second nut are rotationally connected into the gasket, a through hole is formed in the gasket, and the outer wall of the first nut is in threaded connection with the interior of the chuck. According to the utility model, a sample is placed between the two chucks, then the sample is fixed through the nut, the device is adjusted to a proper angle through the knob for testing, and detection is carried out through the temperature detector and the pressure detector, so that the cross-shaped sample can be stably and accurately clamped, and the device is suitable for various fatigue test scenes; and the test accuracy and reliability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sample test technical field especially, relate to a cross sample fatigue test fixture. BACKGROUND

[0002] In the research scope of material science, the in-depth exploration of material fatigue performance occupies the pivotal position. Especially for the cross sample with special structure, its fatigue test result is like a key, can open the door of many fields technical innovation and product optimization. In the field of aerospace, the design of key parts of aircraft depends on the accurate grasp of the fatigue performance of materials under complex stress environment, and the cross sample can simulate the stress condition of the complex structure such as the connection between wing and fuselage. In the automobile industry, the fatigue performance of the key parts of the engine and the connecting parts of the chassis also needs to be evaluated by the test of cross sample. Therefore, a cross sample fatigue test fixture with excellent performance has become the core tool to obtain accurate and reliable test data, and its performance directly affects the determination of the real fatigue characteristics of materials, and further affects the quality and safety of related products.

[0003] In the existing cross sample fatigue test field, the mechanical structure and technical principle adopted are relatively traditional. The common fixture is mainly in the form of simple clamp structure, which sets spring or bolt at the chuck part and uses mechanical force to fix the sample. Usually, the sample is placed in the preset clamping groove, and then the bolt is tightened to keep the sample relatively stationary by friction. From the technical principle level, this method mainly relies on static mechanical constraint, trying to maintain the stability of the sample during the test. However, this method is not enough when facing complex and diverse test requirements. Especially in terms of sample angle adjustment and stress direction simulation, it lacks sufficient flexibility and accuracy, and it is difficult to meet the requirements of modern material science research for multidimensional and high-precision testing.

[0004] However, the existing test fixture has a key problem, that is, it is difficult to flexibly adapt to different test requirements of force direction. The conventional axial fatigue sample is only applicable to the test scene that the clamping direction of both ends and the force direction of the sample are axial. However, in actual application, such as cross riveting plate material, cross bonding plate material and the like, the force direction in the actual working environment is complex and various, and is not simply axial force. The existing fixture cannot conveniently realize the fatigue test of the special angle of 90 degrees between the clamping direction and the force direction. This leads to that when the sample is tested, the stress state of the sample in the actual working condition cannot be truly restored, the test result has a large deviation, seriously affects the accurate evaluation of the material performance, makes the material selection, product design and the like based on the test result lack reliable basis, and causes a series of potential quality risks and safety hazards. Therefore, a cross sample fatigue test fixture is provided to solve the above problems. Practical new type content

[0005] In order to make up for the above shortcomings, the utility model provides a cross sample fatigue test fixture, aims at improving the problem that the conventional axial fatigue sample in the prior art is only applicable to the test that the clamping direction of both ends and the force direction of the sample are axial.

[0006] In order to realize the above purpose, the utility model adopts the following technical scheme:

[0007] A cross sample fatigue test fixture, comprising two chucks, the chuck outer wall is provided with a gasket, the chuck inside is provided with a stabilizing assembly, the chuck top is provided with an adjusting assembly;

[0008] The stabilizing assembly comprises a nut one and a nut two, the nut one and the nut outer wall are rotatably connected in the gasket inside, the gasket inside is provided with a through hole, the nut one outer wall is screw connected in the chuck inside, the nut two outer wall is screw connected in the other chuck inside, and the chuck outer wall is fixedly connected with a rubber pad;

[0009] As a further description of the above technical scheme:

[0010] The chuck inside is provided with a pressure detector, and the other chuck inside is provided with a temperature detector;

[0011] As a further description of the above technical scheme:

[0012] The gasket outer wall is fixedly connected with a goose neck pipe, and the goose neck pipe one end is fixedly connected with a spray head;

[0013] As a further description of the above technical scheme:

[0014] The adjusting assembly comprises a fixed shell, and the fixed shell outer wall is fixedly connected with the chuck outer wall.

[0015] As a further description of the above technical solutions:

[0016] The fixed shell is rotationally connected with a connecting column inside, and one end of the connecting column is fixedly connected with a rotating knob;

[0017] As a further description of the above technical solutions:

[0018] The other end of the rotating knob is fixedly connected with a worm wheel, and a worm is rotationally connected inside the fixed shell and engaged with the worm wheel;

[0019] As a further description of the above technical solutions:

[0020] The worm is fixedly connected with a rotating column outside, and the rotating column is rotationally connected inside the chuck;

[0021] As a further description of the above technical solutions:

[0022] The rotating column is fixedly connected with a rotating column outside, and the rotating column is fixedly connected with a clamping block at the top.

[0023] The utility model has the following beneficial effects:

[0024] In the utility model, the sample is placed between the two chucks, then the nut is passed through the corresponding gasket fixedly and adjusted through the internal through hole, the sample is fixed, then the rotating knob is rotated, the rotating column is driven to rotate through the rotating knob cooperating with the worm and the worm wheel, the device is adjusted to the appropriate angle, then the device is fixed in the measuring tool through the clamping block for testing, and the temperature detector and the pressure detector are detected, when the temperature is too high, the nozzle is started, the sample is cooled through the nozzle, so that the cross-shaped sample can be stably and accurately clamped, which is suitable for various fatigue test scenes, and the fatigue test can be realized when the clamping direction and the stress direction are 90 degrees, such as cross riveting plate, cross bonding plate and the like, the problem that the conventional axial fatigue test sample is only suitable for the test when the clamping direction of both ends and the stress direction of the sample are axial is solved, and the accuracy and reliability of the test are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A three-dimensional schematic view of a cross-shaped sample fatigue test clamp is provided for the utility model;

[0026] Figure 2 A structure schematic view of a chuck of a cross-shaped sample fatigue test clamp is provided for the utility model;

[0027] Figure 3 A structure schematic view of a gasket of a cross-shaped sample fatigue test clamp is provided for the utility model;

[0028] Figure 4 A structure diagram of the inside of the fixed shell of the cross-shaped sample fatigue test fixture is provided.

[0029] Legend:

[0030] 1, chuck; 2, fixed shell; 3, rotating column; 4, clamping block; 5, rotating column; 6, goose neck pipe; 7, rubber pad; 8, gasket; 9, nut one; 10, nut two; 11, spray head; 12, rotating knob; 13, connecting column; 14, worm; 15, worm wheel; 16, temperature detector; 17, pressure detector; 18, through hole. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] Reference Figure 1 - Figure 3The utility model provides a kind of embodiment: a cross sample fatigue test fixture, it adopts high-strength alloy material, this alloy is treated by special heat treatment process, with excellent strength and toughness, can keep stable structure under the condition of long-term complex stress bearing, grommet 8 is provided on the outer wall of chuck 1, grommet 8 also selects high-strength and wear-resistant alloy material, and it forms firm cooperation with chuck 1, chuck 1 is provided with adjusting assembly in inside, chuck 1 top is provided with adjusting assembly, and adjusting assembly includes nut one 9 and nut two 10, and nut one 9 and nut two 10 are made of high-strength stainless steel, and its thread is processed by high accuracy, ensure that it can be smoothly and accurately adjusted in the process of rotating, nut one 9 and nut two 10 outer wall are rotationally connected in grommet 8 inside, through hole 18 is set in grommet 8 inside, nut one 9 outer wall is screw-connected in chuck 1 inside, nut two 10 outer wall is screw-connected in another chuck 1 inside, chuck 1 bottom is fixedly connected with rubber pad 7, and rubber pad 7 adopts high elasticity, low hardness high-quality rubber, with good buffering performance and antiskid effect, can effectively protect sample, while ensuring that sample does not displace in testing process, chuck 1 is provided with pressure detector 17 in inside, another chuck 1 is provided with temperature detector 16 in inside, grommet 8 outer wall is fixedly connected with goose neck pipe 6, one end of goose neck pipe 6 is fixedly connected with spray head 11, and spray head 11 adopts corrosion-resistant plastic material, can uniformly spray cooling medium on sample surface, realizes rapid cooling, adjusting assembly includes fixed shell 2, and fixed shell 2 adopts high-strength aluminum alloy material, reduces overall weight while ensuring structural strength, fixed shell 2 outer wall is fixedly connected in chuck 1 outer wall, fixed shell 2 inside is rotationally connected with connecting column 13, one end of connecting column 13 is fixedly connected with knob 12, and knob 12 adopts ergonomics design, convenient for operator to hold and rotate, another end of knob 12 is fixedly connected with worm wheel 15, fixed shell 2 inside is rotationally connected with worm 14, and worm 14 is engaged with worm wheel 15, worm 14 outer wall is fixedly connected with rotating column 5, and rotating column 5 outer wall is rotationally connected in chuck 1 inside, rotating column 5 outer wall is fixedly connected with rotating column 3, and the clamping block 4 fixedly connected in the top of rotating column 3 adopts antiskid rubber material, can stably clamp sample, while avoiding damage to sample, rotating column 3 top is fixedly connected with clamping block 4.

[0033] Specifically, in the detection work of the cross-shaped sample, each step needs to be operated accurately to ensure the accuracy and reliability of the detection results. First, the cross-shaped sample is placed between the two clamps 1 and fixed through the gasket 8. In order to avoid scratching the sample during clamping, rubber pads 7 are specially arranged at the contact part. The rubber pads 7 are made of high-quality rubber with high elasticity and low friction coefficient, which has good buffering and protection effect. Then, the nuts 9 and 10 pass through the sample and the through hole 18 in the gasket 8, and enter the corresponding clamp 1. The through hole 18 is a long hole which can adjust the position of the sample, and the adaptability is better. Then, through professional tools, the sample is firmly fixed in the clamp 1 by the fastening force of the nuts. Subsequently, according to the actual test requirements and the expected simulation working conditions, the operator needs to rotate the knob 12. The knob 12 is closely connected with the connecting column 13, and the rotation of the knob 12 will drive the connecting column 13 to rotate synchronously. The other end of the connecting column 13 is fixed with the worm gear 15, so as to drive the worm gear 15 to rotate. Since the worm gear 15 and the worm 14 are meshed, the rotation of the worm gear 15 will drive the worm 14 to rotate. The rotation of the worm 14 further drives the rotating column 5 to rotate, and the rotating column 5 is connected with the rotating column 3, so as to finally realize the rotation of the rotating column 3, so as to adjust the sample to different angles to meet the diversified test scene requirements. During the whole test process, the temperature detector 16 and the pressure detector 17 continuously play a role, and the change of pressure and temperature is monitored in real time. Once the temperature detector 16 detects that the internal temperature is too high, the system will immediately start the spray head 11, which will quickly spray cooling gas on the sample to ensure that the sample always maintains in the appropriate temperature range, and ensures the stability of the sample in the test process, laying a solid foundation for obtaining accurate test data.

[0034] Working principle: when detecting the cross-shaped sample, place it between the two clamps 1, contact with the sample through the rubber pad 7 to protect it from being scratched, and fix it through the gasket 8. Then, pass the nuts 9 and 10 through the sample and the through hole 18 into the corresponding clamp 1, and then rotate to fix the sample. Then, according to the test situation, rotate the knob 12 to drive the connecting column 13 to rotate, and then drive the worm gear 15 to rotate through the connecting column 13 to drive the meshed worm 14 to rotate, so as to drive the rotating column 5 to rotate, and then drive the rotating column 3 to rotate through the rotating column 5 to correspond to different angles. Then, detect the pressure and temperature through the temperature detector 16 and the pressure detector 17, and start the spray head 11 according to the internal temperature. When the temperature is too high, the spray head 11 sprays cooling gas on the sample to maintain the appropriate temperature and ensure the stability of the sample.

[0035] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A cross-shaped sample fatigue testing fixture, comprising two clamps (1), characterized in that: The outer wall of the chuck (1) is provided with a pad (8), the inside of the chuck (1) is provided with a stabilizing component, and the top of the chuck (1) is provided with an adjusting component; The stabilizing component includes a first nut (9) and a second nut (10). The outer walls of the first nut (9) and the second nut (10) are rotatably connected to the inside of the washer (8). The inside of the washer (8) is provided with a through hole (18). The outer wall of the first nut (9) is threadedly connected to the inside of the chuck (1). The outer wall of the second nut (10) is threadedly connected to the inside of another chuck (1). A rubber pad (7) is fixedly connected to the outer wall of the chuck (1).

2. The cross-shaped sample fatigue testing fixture according to claim 1, characterized in that: The chuck (1) is equipped with a pressure detector (17), and the other chuck (1) is equipped with a temperature detector (16).

3. The cross-shaped sample fatigue testing fixture according to claim 2, characterized in that: The outer wall of the clamp (1) is fixedly connected to a gooseneck tube (6), and one end of the gooseneck tube (6) is fixedly connected to a nozzle (11).

4. The cross-shaped sample fatigue testing fixture according to claim 3, characterized in that: The adjustment assembly includes a fixed housing (2), the outer wall of which is fixedly connected to the outer wall of the clamp (1).

5. A cross-shaped sample fatigue testing fixture according to claim 4, characterized in that: The fixed outer shell (2) is rotatably connected to a connecting column (13), and a knob (12) is fixedly connected to one end of the connecting column (13).

6. A cross-shaped sample fatigue testing fixture according to claim 5, characterized in that: The other end of the knob (12) is fixedly connected to a worm gear (15), and a worm (14) is rotatably connected inside the fixed housing (2), and the worm (14) meshes with the worm gear (15).

7. A cross-shaped sample fatigue testing fixture according to claim 6, characterized in that: The outer wall of the worm (14) is fixedly connected to a rotating column (5), and the outer wall of the rotating column (5) is rotatably connected inside the chuck (1).

8. A cross-shaped sample fatigue testing fixture according to claim 7, characterized in that: A rotating column (3) is fixedly connected to the outer wall of the rotating column (5), and a clamping block (4) is fixedly connected to the top of the rotating column (3).

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