Testing machine chuck for material deflection test and deflection test equipment

Abstract

The invention discloses a testing machine chuck used for a material deflection test and deflection test equipment. The testing machine chuck used for the material deflection test comprises a base, a clamping device and a clamping device, the clamping block is arranged on the base in a sliding mode, the clamping block comprises an arc-shaped lower clamping part which extends out of the base, and the clamping block eliminates stress concentration through the lower clamping part; and the driver is used for driving the clamping block to press the sample. The deflection test equipment comprises the testing machine chuck for the material deflection test. At the lower end of the joint of the sample and the clamping block, the testing machine chuck for the material deflection test adopts the arc-shaped lower clamping part to form an arc transition surface, so that stress concentration is avoided, and the problems of local damage, accelerated fatigue failure, brittleness increase, bearing capacity reduction and the like caused by the stress concentration are effectively improved; and the probability that the sample is pinched off is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of flexural testing, and in particular to a testing machine chuck and flexural testing equipment for material flexural testing. Background Art

[0002] Whether it is the tires of airplanes and cars, or the leather of leather shoes, they will undergo a long period of repeated bending during use. The flexural deformation performance of these specimens and structures under complex stress states will directly determine the safety and life of the tires and leather. Therefore, it is necessary to conduct flexural tests on these specimens and structures.

[0003] Therefore, corresponding bending test equipment has also been designed in the prior art. However, the prior bending test equipment has the following defects: during repeated bending, the sample is easily broken by using a conventional chuck, which affects the test results. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing flexural test equipment is prone to the phenomenon of sample pinching and breaking. The purpose is to provide a testing machine chuck and flexural test equipment for material flexural test to solve the above problem.

[0005] The present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a testing machine chuck for a material flexure test, comprising: base; A clamping block is slidably arranged on the base, the clamping block includes a lower clamping portion extending outside the base and in an arc shape, and the clamping block eliminates stress concentration through the lower clamping portion; and a driver, for driving the clamping block to press the specimen.

[0006] In one possible design, the base is provided with two independent and oppositely disposed pressure chambers, each of which is filled with a fluid medium; Correspondingly, two clamping blocks are provided and are slidably arranged on one of the pressure chambers respectively. The two clamping blocks are opposite to each other and form a test slot for clamping the sample; the lower clamping portion of the clamping block extends outside the base; Correspondingly, a sealing structure is provided at the connection between the pressure chamber and the clamping block.

[0007] In one possible design, the pressure chamber is configured as a cylindrical chamber, a square chamber, or a polygonal chamber.

[0008] In a possible design, the driver is a gas source or a liquid source, and the driver is connected to the base through an intermediate tube. Accordingly, the fluid medium in the pressure chamber is constructed as a gas medium or a liquid medium.

[0009] In a possible design, the clamping block includes a base and the lower clamping portion, the base is slidably disposed on the pressure chamber, and the lower clamping portion is connected to the base and extends outside the base.

[0010] In a possible design, the arc-shaped configuration of the lower clamping portion is a parabola, a catenary, an involute or a circular arc.

[0011] In a possible design, the base is connected to an upper clamping portion located inside the base and outside the pressure chamber, and the upper clamping portion and the lower clamping portion are arranged one above and one below.

[0012] In a possible design, two clamping blocks are provided and arranged opposite to each other on the base. Accordingly, the driver is used to drive the two clamping blocks to press against each other; accordingly, the lower clamping parts of the two clamping blocks are both arc-shaped, so that the two clamping blocks constitute a butterfly clamp.

[0013] In one possible design, specimens held by the jaws include leather, rubber, cloth, and plastic.

[0014] In a second aspect, the present invention provides a flexural test device, comprising the testing machine chuck for material flexural test.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: At the lower end of the connection between the specimen and the clamping block, the testing machine chuck for the material flexural test adopts an arc-shaped lower clamping part to form an arc transition surface to avoid stress concentration. Problems such as local damage, accelerated fatigue failure, increased brittleness, and decreased bearing capacity caused by stress concentration are effectively improved, and the probability of the specimen being clamped off is greatly reduced.

[0016] The driver uses an air source or a liquid source to drive the clamp to move and maintain pressure during the test, solving the problem of the sample slipping due to stretching and thinning.

[0017] Therefore, by solving the defects of the existing flexural test equipment, the success rate of the test is greatly improved, and it has strong application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings: Figure 1 The figure is a schematic diagram of the structure of a testing machine chuck used for material flexure testing.

[0019] Figure 2Schematic diagram of the structure of the clamping block.

[0020] Markings and corresponding parts names in the accompanying drawings: 1. Base; 101. Pressure chamber; 2. Clamping block; 201. Lower clamping part; 202. Base; 203. Upper clamping part; 3. Driver; 4. Sample; 5. Intermediate tube. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0022] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0023] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combinations and / or subcombinations. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0024] In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0025] Example: For existing bending test equipment, when the clamp presses the sample 4, the following phenomenon may occur: during repeated bending, the sample 4 is easily broken, resulting in test failure. For this reason, the existing bending test equipment is inconvenient to use and has poor practicality.

[0026] Therefore, this embodiment provides a testing machine chuck for material flexural test. At the lower end of the connection between the sample 4 and the clamping block 2, the testing machine chuck for material flexural test adopts an arc-shaped lower clamping part 201 to form an arc transition surface to avoid stress concentration. Problems such as local damage, accelerated fatigue failure, increased brittleness, and decreased bearing capacity caused by stress concentration are effectively improved, and the probability of the sample 4 being clamped off is greatly reduced.

[0027] Specifically: Figure 1 and Figure 2 As shown, in a first aspect, the present invention provides a testing machine chuck for a material flexure test, comprising: Base 1; A clamping block 2 is slidably disposed on the base 1. The clamping block 2 includes an arc-shaped lower clamping portion 201 extending outside the base 1. The clamping block 2 eliminates stress concentration through the lower clamping portion 201. And, the driver 3 is used to drive the clamping block 2 to press the sample 4.

[0028] The base 1 is used to connect the flexure test equipment. At the same time, the other components of the test machine chuck for material flexure test are connected as an organic whole through the base 1, thereby completing the flexure test. It is easy to understand that the base 1 can be constructed in any suitable shape.

[0029] The clamp 2 directly contacts the sample 4. For the sample 4, it can be divided into a compressed part that contacts the clamp 2 and a free part that does not contact the clamp 2. The compressed part is relatively evenly stressed and is not easily broken. The free part is not stressed, but stress concentration is likely to occur at the junction of the compressed part and the free part, that is, the edge of the clamp 2.

[0030] Due to the characteristics of the flexure test, stress concentration is more likely to occur at the lower end of the clamp block 2 during repeated flexure. Therefore, the lower portion of the clamp block 2, i.e., the lower clamping portion 201, is constructed in an arc shape to better distribute the stress of the specimen 4, eliminate sudden stress changes, reduce local stress peaks, and achieve smooth load transfer, thereby ensuring that the specimen 4 will not be broken.

[0031] The driver 3 is used to provide driving force so that the clamping block 2 presses the specimen 4, ensuring that the clamping force of the clamping block 2 meets the test requirements.

[0032] During operation, the clamp block 2 has a gap on its exterior, into which the operator inserts the upper end of the specimen 4. Actuator 3 is activated to move the clamp block 2, clamping the specimen 4 and then symmetrically securing the lower end. The clamping force should be adapted to the test requirements to prevent the specimen 4 from falling out. An initial load is applied, and the flexure test equipment is inspected and calibrated. Once verified, the flexure test equipment can be activated to conduct the flexure test using the chuck of the material flexure tester.

[0033] In a possible implementation, the base 1 is provided with two pressure chambers 101 that are independent of each other and arranged opposite to each other, and the pressure chambers 101 are filled with a fluid medium; Accordingly, two clamping blocks 2 are provided and are slidably disposed on one of the pressure chambers 101. The two clamping blocks 2 are opposite to each other and form a test slot for clamping the sample 4. The lower clamping portion 201 of the clamping block 2 extends outside the base 1. Correspondingly, a sealing structure is provided at the connection between the pressure chamber 101 and the clamping block 2 .

[0034] Based on the above design, pressure chamber 101 is filled with a fluid medium. When actuator 3 is activated, the pressure in pressure chamber 101 increases, and the fluid medium flows and pushes clamp 2 to slide, causing clamp 2 to press against specimen 4. The fluid medium can be a gaseous or liquid medium, which can maintain pressure during the test, preventing specimen 4 from slipping and avoiding test failure due to specimen 4 detaching from the chuck.

[0035] Furthermore, with existing flexure testing equipment, during the flexure test, the specimen 4 gradually becomes thinner. This thinning specimen 4 is not held firmly by the chuck, and can easily slip from the chuck, leading to test failure. To address this issue, the use of a fluid medium allows the clamping block 2 to maintain constant pressure, ensuring that the specimen 4 does not slip.

[0036] It is worth noting that the pressure chamber 101 is sealed by the clamping block 2, which cooperates with the sealing structure. Based on this, leakage of the fluid medium is prevented and the fluid medium effectively transmits pressure to the clamping block 2, thereby driving the clamping block 2 to move. It is easy to understand that the sealing structure can adopt any suitable existing dynamic sealing structure.

[0037] In a possible implementation, the pressure chamber 101 is configured as a cylindrical chamber, a square chamber, or a polygonal chamber. Based on this, the pressure chamber 101 can be configured in any suitable shape to better adapt to different test requirements.

[0038] In one possible implementation, driver 3 utilizes either an air source or a liquid source, connected to base 1 via intermediate tube 5. Accordingly, the fluid medium in pressure chamber 101 is constructed as either a gaseous or liquid medium. The air source, i.e., an industrial power source, is an air compression system centered around an air compressor and an air source processor. This compressed air propels clamping block 2 to press against specimen 4. Similarly, the liquid source is a hydraulic power system using liquid as a medium, providing base 1 with a stable, high-pressure liquid, thereby propel clamping block 2 to press against specimen 4.

[0039] It is easy to understand that the gas source and liquid source can be any suitable existing equipment, with a wide range of options to adapt to different usage scenarios. The gas medium can be any suitable gas, and similarly, the liquid medium can be any suitable liquid.

[0040] It is easy to understand that the intermediate pipe 5 can be any suitable existing pipe to adapt to the driver 3 and the working environment, thereby ensuring the practicality of the testing machine chuck for material flexure testing.

[0041] In a possible implementation, the clamping block 2 includes a base 202 and the lower clamping portion 201 . The base 202 is slidably disposed on the pressure chamber 101 . The lower clamping portion 201 is connected to the base 202 and extends outside the base 1 .

[0042] Based on the above design, base 202 is configured to fit the shape of pressure chamber 101, improving the fit between clamp 2 and base 1 and enhancing the smoothness of movement of clamp 2. Lower clamping portion 201 is curved and serves as a circular transition surface to eliminate stress concentration and prevent specimen 4 from being broken.

[0043] In one possible implementation, the arc shape of the lower clamping portion 201 is a parabola, a catenary, an involute, or a circular arc. In addition to the aforementioned arc shapes, the lower clamping portion 201 can also be configured in any other suitable arc shape to better suit the working requirements and ensure that the sample 4 is not broken.

[0044] In one possible implementation, the base 202 is connected to an upper clamping portion 203 located within the base 1 and outside the pressure chamber 101. The upper clamping portion 203 is arranged above and below the lower clamping portion 201. Based on this, the provision of the upper clamping portion 203 further increases the contact area between the clamping block 2 and the specimen 4, improving the stability of the clamping of the specimen 4. When the clamping block 2 is reset, the simultaneous contact of the upper clamping portion 203 and the lower clamping portion 201 with the base 1 indicates that the clamping block 2 has been reset to its limit position, ensuring that the clamping block 2 moves synchronously as a whole and that the specimen 4 is evenly compressed.

[0045] In one possible implementation, two clamping blocks 2 are provided and arranged opposite to each other on the base 1. Accordingly, the driver 3 is used to drive the two clamping blocks 2 to press against each other; accordingly, the lower clamping portions 201 of the two clamping blocks 2 are both arc-shaped, so that the two clamping blocks 2 constitute a butterfly chuck.

[0046] Based on the above design scheme, extrusion on both sides is achieved by the cooperation of two clamps 2, or, if there is only one clamp 2, one clamp 2 presses the sample 4 and achieves unilateral extrusion. Therefore, by flexibly setting the number of clamps 2, that is, one clamp 2 or two clamps 2, the form of extruding the sample 4 can be changed, thereby completing different types of flexural tests.

[0047] Optionally, when two clamping blocks 2 are provided, one clamping block 2 remains stationary, and the other clamping block 2 slides and presses the sample 4. That is, unilateral extrusion is achieved by the two clamping blocks 2, thereby expanding the use and function of the embodiment of the two clamping blocks 2.

[0048] Accordingly, if the two clamps 2 move synchronously, that is, they slide synchronously and press the specimen 4, a single driver 3 can be provided to push both clamps 2 to slide synchronously. Alternatively, two drivers 3 can be provided, each used to push one of the clamps 2 to slide, so that both clamps 2 slide synchronously. Conversely, if the two clamps 2 move asynchronously, their centerlines may not align with the centerline of the device after clamping, resulting in eccentricity. Therefore, synchronized movement of the clamps 2 is preferred.

[0049] In one possible implementation, the sample 4 clamped by the clamp block 2 includes leather, rubber, cloth, and plastic. It is easy to understand that the sample 4 can also be made of any other suitable material to expand the use range of the testing machine clamp for material flexure testing and improve practicality.

[0050] In a second aspect, the present invention provides a flexure testing device comprising the aforementioned testing machine chuck for material flexure testing. Based on this, the flexure testing device can also include any other suitable functional modules, further enriching its functionality to meet diverse operational requirements and enhancing practicality. As will be readily understood, the functional modules can be selected from any suitable existing equipment, providing a wide range of options.

[0051] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A testing machine chuck for material flexure testing, characterized in that: include: Base (1); A clamping block (2) is slidably arranged on the base (1), the clamping block (2) comprises a lower clamping portion (201) extending outside the base (1) and having an arc shape, and the clamping block (2) eliminates stress concentration through the lower clamping portion (201); And, a driver (3) for driving the clamping block (2) to press the specimen (4).

2. The testing machine chuck for material flexure testing according to claim 1, characterized in that: The base (1) is provided with two pressure chambers (101) which are independent of each other and arranged opposite to each other, and the pressure chambers (101) are filled with a fluid medium; Accordingly, two clamping blocks (2) are provided and are respectively slidably arranged on one of the pressure chambers (101), and the two clamping blocks (2) are opposite to each other and form a test slot for clamping the sample (4); the lower clamping portion (201) of the clamping block (2) extends outside the base (1); Correspondingly, a sealing structure is provided at the connection between the pressure chamber (101) and the clamping block (2).

3. The testing machine chuck for material flexure testing according to claim 2, characterized in that: The pressure chamber (101) is constructed as a cylindrical chamber, a square chamber or a polygonal chamber.

4. The testing machine chuck for material flexure testing according to claim 2, characterized in that: The driver (3) is a gas source or a liquid source, and the driver (3) is connected to the base (1) through the intermediate tube (5). Accordingly, the fluid medium in the pressure chamber (101) is a gas medium or a liquid medium.

5. The testing machine chuck for material flexure testing according to any one of claims 1 to 4, characterized in that: The clamping block (2) comprises a base (202) and the lower clamping portion (201), the base (202) being slidably arranged on the pressure chamber (101), and the lower clamping portion (201) being connected to the base (202) and extending outside the base (1).

6. The testing machine chuck for material flexure testing according to claim 5, characterized in that: The arc structure of the lower clamping portion (201) is a parabola, a catenary, an involute or a circular arc.

7. The testing machine chuck for material flexure testing according to claim 6, characterized in that: An upper clamping portion (203) located inside the base (1) and outside the pressure chamber (101) is connected to the base (202), and the upper clamping portion (203) and the lower clamping portion (201) are arranged one above the other.

8. The testing machine chuck for material flexure testing according to claim 7, characterized in that: Two clamping blocks (2) are provided and are arranged opposite to each other on the base (1). Accordingly, the driver (3) is used to drive the two clamping blocks (2) to press against each other; accordingly, the lower clamping portions (201) of the two clamping blocks (2) are both arc-shaped, so that the two clamping blocks (2) form a butterfly clamp.

9. The testing machine chuck for material flexure testing according to claim 1, characterized in that: The specimens (4) held by the clamps (2) include leather, rubber, cloth and plastic.

10. A flexure test device, characterized in that: A testing machine chuck for a material flexure test comprising the chuck according to any one of claims 1 to 9.

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