Conversion tool for realizing compression test on tensile testing machine

Abstract

The invention relates to the technical field of material mechanical property testing equipment, and discloses a conversion tool for realizing a compression test on a tensile testing machine, which comprises an upper transfer assembly, a lower transfer assembly arranged at the bottom of the upper transfer assembly, and a sample positioning assembly arranged on the upper transfer assembly and the lower transfer assembly. Through the nested U-shaped conversion sleeve design of the upper and lower transmission assemblies, the upward tension of the tensile testing machine can be stably converted into the axial pressure on the sample, the upper and lower tension conversion sleeves can deflect around mutually perpendicular directions through a bidirectional orthogonal rotation connection structure, the sample is ensured to bear pure axial load all the time, the accuracy of the compression test is improved, and the test efficiency is improved. The sample positioning assembly can realize accurate centering of samples with different sizes, the precision of the tensile test is obviously improved, the whole structure is rapidly adapted to various tensile testing machines through a standardized threaded interface, and the numerical value measurement of the compression test is realized through the original sensor system of the tensile testing machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material mechanical property testing equipment, and in particular to a conversion tool for realizing compression testing on a tensile testing machine. BACKGROUND

[0002] Electronic universal testing machines and hydraulic universal testing machines are core equipment for material mechanical property testing (such as tensile strength, yield strength, elastic modulus, etc.), and their basic structures include a fixed crossbeam, a movable crossbeam controlled to move by a driving system, upper and lower clamps for clamping a sample, and a force sensor and a displacement / deformation measurement system.

[0003] The standard clamp design of a conventional testing machine is only suitable for tensile testing, and when the movable crossbeam moves downward, the upper and lower clamps are separated from each other, and it is impossible to apply a stable and effective compression force to the sample to be tested. Although an operator may sometimes use a simple pad or a self-made clamp for compression testing, such a temporary solution has poor centering and stability, the applied load is easy to deviate from the sample axis, causing the test data to be distorted or the sample to be abnormally damaged, and it is easy to cause the clamp to slide or overturn. Moreover, such a temporary solution cannot be accurately integrated with the force sensor and displacement measurement system of the testing machine, which seriously affects the accuracy and reliability of the test data. SUMMARY

[0004] In view of the above problems of the prior art, the present application is proposed.

[0005] Therefore, the present application aims to provide a conversion tool for realizing compression testing on a tensile testing machine.

[0006] To solve the above technical problems, the present application provides the following technical solutions: comprising,

[0007] an upper transmission assembly, a lower transmission assembly arranged at the bottom of the upper transmission assembly, and a sample positioning assembly arranged on the upper transmission assembly and the lower transmission assembly;

[0008] The upper transmission assembly and the lower transmission assembly cooperate to convert the tensile force of the tensile testing machine into compression force, and the sample positioning assembly is used for centering and positioning the sample to be tested.

[0009] As a preferred solution of the present application, the upper transmission assembly comprises an upper pulling piece, a first pin arranged at the bottom end of the upper pulling piece, and an upper tensile force conversion sleeve arranged on both ends of the first pin.

[0010] As a preferred solution of the conversion tool for realizing compression test on tensile testing machine, the lower transmission assembly comprises a lower tension conversion sleeve nested with the upper tension conversion sleeve, a second pin penetrating through both ends of the lower tension conversion sleeve, and a lower puller sleeved on the outer surface of the second pin.

[0011] As a preferred solution of the conversion tool for realizing compression test on tensile testing machine, the sample positioning assembly comprises two sample positioning holes penetrating through both ends of the upper tension conversion sleeve and the lower tension conversion sleeve respectively, positioning grooves respectively formed in the inner cavities of the upper tension conversion sleeve and the lower tension conversion sleeve, and sample positioning marks arranged on the inner surfaces of the positioning grooves.

[0012] As a preferred solution of the conversion tool for realizing compression test on tensile testing machine, the sample positioning assembly further comprises positioning nuts symmetrically arranged on the two sample positioning holes, and the positioning nuts are threadedly connected with the sample positioning holes.

[0013] As a preferred solution of the conversion tool for realizing compression test on tensile testing machine, the upper end of the upper puller and the lower end of the lower puller are respectively provided with threaded heads connected with the upper clamp and the lower clamp of the tensile testing machine.

[0014] As a preferred solution of the conversion tool for realizing compression test on tensile testing machine, the upper tension conversion sleeve and the lower tension conversion sleeve are both U-shaped, and the inner walls of the U-shaped sleeves are closely attached to each other and can slide relative to each other.

[0015] As a preferred solution of the conversion tool for realizing compression test on tensile testing machine, the upper puller is rotationally connected with the upper tension conversion sleeve through the first pin, and the lower puller is rotationally connected with the lower tension conversion sleeve through the second pin.

[0016] The conversion tool has the following advantages: the nested U-shaped conversion sleeves of the upper and lower transmission assemblies can stably convert the upward tension of the tensile testing machine into axial pressure on the sample, the bidirectional orthogonal rotation connection structure allows the upper and lower tension conversion sleeves to deflect around perpendicular directions, ensuring that the sample always bears pure axial load, improving the accuracy of compression test, the sample positioning assembly can accurately center different sizes of samples, significantly improving the precision of tensile test, the overall structure is quickly adapted to various tensile testing machines through standardized threaded interfaces, and the numerical measurement of compression test is realized through the original sensor system of the tensile testing machine. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without any creative effort, and the present application is not limited to the following disclosed embodiments.

[0018] Figure 1 It is an overall structure schematic diagram of the present application.

[0019] Figure 2 It is an upper transmission assembly structure schematic diagram of the present application.

[0020] Figure 3 It is a lower transmission assembly structure schematic diagram of the present application.

[0021] Figure 4 It is an upper pulling force conversion sleeve structure schematic diagram of the present application.

[0022] Figure 5 It is a positioning nut installation schematic diagram of the present application.

[0023] Figure 6 It is an overall structure explosion schematic diagram of the present application.

[0024] Figure 7 It is a sample positioning assembly use schematic diagram of the present application.

[0025] In the drawings: 1, upper transmission assembly; 101, upper pulling piece; 102, first pin; 103, upper pulling force conversion sleeve; 2, lower transmission assembly; 201, lower pulling force conversion sleeve; 202, second pin; 203, lower pulling piece; 300, sample positioning assembly; 301, sample positioning hole; 302, positioning nut; 303, positioning groove; 304, sample positioning mark. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0027] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the scope of the present application, therefore the present application is not limited to the following disclosed embodiments.

[0028] Second, the "one embodiment" or "an embodiment" referred to herein means a specific feature, structure, characteristic, or combination of features and / or characteristics described herein that can be included in at least one implementation of the present application. The various appearances of "in one embodiment" or "an embodiment" in the specification do not all refer to the same embodiment, although they can.

[0029] Third, the present application is described in detail in conjunction with the schematic diagram. In the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual production.

[0030] Embodiment 1

[0031] Reference Figures 1-3 For the first embodiment of the present application, a conversion tool for realizing compression test on a tensile testing machine is provided, which comprises.

[0032] The upper transmission assembly 1 and the lower transmission assembly 2 arranged at the bottom of the upper transmission assembly 1;

[0033] The upper transmission assembly 1 and the lower transmission assembly 2 can convert the tensile force of the tensile testing machine into pressure.

[0034] Specifically, the upper transmission assembly 1 comprises an upper pulling piece 101, a first pin 102 arranged at the bottom end of the upper pulling piece 101, and an upper tensile force conversion sleeve 103 sleeved on both ends of the first pin 102.

[0035] Further, the lower transmission assembly 2 comprises a lower tensile force conversion sleeve 201 nested with the upper tensile force conversion sleeve 103, a second pin 202 penetrating through both ends of the lower tensile force conversion sleeve 201, and a lower pulling piece 203 sleeved on the outer surface of the second pin 202.

[0036] Further, the top end of the upper pulling piece 101 and the bottom end of the lower pulling piece 203 are respectively provided with threaded heads connected with the upper clamp and the lower clamp of the tensile testing machine.

[0037] It should be noted that the tensile testing machine is provided with a force sensor for measuring tensile and compressive force and a displacement sensor for measuring the displacement of the movable cross beam. When compression test is performed, the related data can be accurately measured by means of various sensors on the tensile testing machine.

[0038] Among them, the upper tensile force conversion sleeve 103 and the lower tensile force conversion sleeve 201 are both U-shaped, and the inner walls of the U-shaped are closely fitted and can slide relative to each other.

[0039] It should be noted that the contact surface of the upper tension conversion sleeve 103 and the lower tension conversion sleeve 201 is a plane, which ensures the stability of force transmission when the tension is converted into pressure, prevents the two from sliding and deflecting, and affects the compression test accuracy. When the upper pulling piece 101 moves upward with the upper clamp of the tensile testing machine, it moves away from the lower pulling piece 203, at which time the upper tension conversion sleeve 103 moves upward synchronously, and the U-shaped inner cavity of the upper tension conversion sleeve 103 and the U-shaped inner cavity of the lower tension conversion sleeve 201 form a trend of moving close to each other. When the test sample is placed between the positioning grooves 303 in the inner cavities of the two, the nested sliding fit of the upper and lower tension conversion sleeves makes the inner cavity contact surface gradually compress the test sample, and then the upward tension of the tensile testing machine is converted into axial extrusion force on the test sample, realizing the loading process of the compression test.

[0040] Preferably, the upper pulling piece 101 is rotationally connected to the upper tension conversion sleeve 103 through the first pin 102, and the lower pulling piece 203 is rotationally connected to the lower tension conversion sleeve 201 through the second pin 202.

[0041] It should be noted that the rotational connection direction of the upper pulling piece 101 and the upper tension conversion sleeve 103 in the upper transmission assembly 1 is perpendicular to the rotational connection direction of the lower pulling piece 203 and the lower tension conversion sleeve 201 in the lower transmission assembly 2. When there is a small angle deviation between the upper clamp and the lower clamp of the tensile testing machine, the upper tension conversion sleeve 103 and the lower tension conversion sleeve 201 can freely swing around two perpendicular directions, compensating for installation errors and ensuring that the test sample always bears pure axial pressure. The two-way rotational freedom allows the test sample to automatically fine-tune its position during the compression process, reducing eccentric loads caused by misalignment of the clamps.

[0042] In use, first screw the threaded head at the top end of the upper pulling piece 101 into the upper clamp of the tensile testing machine, then screw the threaded head at the bottom end of the lower pulling piece 203 into the lower clamp, complete the installation of the tooling, then place the test sample S between the upper tension conversion sleeve 103 and the lower tension conversion sleeve 201, start the tensile testing machine, the upper clamp moves upward to drive the upper pulling piece 101 to rise synchronously, the lower clamp is fixed, the upper tension conversion sleeve 103 moves upward with the upper clamp and slides with the lower tension conversion sleeve 201, the inner cavities of the two gradually approach and extrude the test sample S, then the compression test of the test sample S can be carried out. During the compression test, the force sensor of the tensile testing machine measures the compression force in real time, the displacement sensor measures the displacement of the upper clamp, and the testing machine control system tests and records data according to the set compression test standard (such as ISO 604, ASTM D695, and GB / T 1041, etc.). During the test, if there is an angle deviation between the clamps, the vertical rotation structure of the upper and lower pulling pieces and the conversion sleeves can automatically compensate, so that the test sample S always bears axial pressure, avoiding additional bending moments.

[0043] In summary, through the nested sliding and vertical rotation design of the upper and lower transmission assemblies, the stable conversion of tensile force to compression force of the tensile testing machine is realized, the accuracy of the compression test pressurization direction is ensured, the bidirectional rotation structure effectively compensates the installation error, reduces the influence of eccentric load on the test results, the threaded head can be quickly adapted to the testing machine clamp, and the force sensor and displacement measurement system of the testing machine can be effectively and accurately integrated, which greatly improves the compression test precision and the equipment versatility.

[0044] Embodiment 2

[0045] With reference to Figures 4-7 For the second embodiment of the present application, which is different from the first embodiment, the embodiment provides a sample positioning assembly 3 on the basis of embodiment 1, further improving the accuracy of sample clamping.

[0046] Further, the device further comprises a sample positioning assembly 3 arranged on the upper transmission assembly 1 and the lower transmission assembly 2, and the sample positioning assembly 3 is used for centering and positioning the sample to be tested.

[0047] Further, the sample positioning assembly 3 comprises two sample positioning holes 301 respectively penetrating the upper and lower tensile force conversion sleeves 103 and 201, positioning grooves 303 respectively arranged in the inner cavities of the upper and lower tensile force conversion sleeves 103 and 201, and sample positioning marks 304 arranged on the inner surfaces of the positioning grooves 303.

[0048] Preferably, the sample positioning assembly 3 further comprises positioning nuts 302 symmetrically arranged on the two sample positioning holes 301, and the positioning nuts 302 are threadedly connected with the sample positioning holes 301.

[0049] It should be noted that the positioning groove 303 is used for preliminary centering and positioning of the sample to be tested S, the positioning nut 302 is threadedly connected with the positioning groove 303, and is used for fine adjustment of the position of the sample to be tested S. When the nut 302 is rotated, the end of the nut 302 pushes the sample to be tested S to move in the positioning groove 303, and accurate centering is performed. In the centering process, the sample positioning marks 304 on the inner surface of the positioning groove 303 can be used as positioning marks.

[0050] In use, the sample S to be tested is placed in the positioning groove 303 for preliminary centering, then the two sets of positioning nuts 302 are respectively installed in the sample positioning holes 301 on both sides of the upper and lower tension conversion sleeves 103 and 201, and the positioning nuts 302 on both sides of one of the tension conversion sleeves are simultaneously tightened until the positioning nuts 302 on both sides gently abut against the sample S to be tested, completing the positioning in one direction. Similarly, the positioning nuts 302 on the other tension conversion sleeve are tightened to complete the positioning in the other direction. During the centering process, the sample positioning mark 304 serves as a positioning identification aid to confirm that the sample is centered and has no deviation, and then the tensile testing machine is started to drive the upper clamp to rise and preliminarily pressurize the sample S to be tested, and then the two sets of positioning nuts 302 are removed, and the subsequent loading process is the same as that of Example 1.

[0051] In summary, based on Example 1, Example 2 adds a sample positioning assembly 3, uses the positioning groove 303 to preliminarily center the sample S to be tested, and cooperates with the threaded fine adjustment of the positioning nuts 302 and the auxiliary identification of the sample positioning mark 304 to accurately complete the centering of the sample in two mutually perpendicular directions, significantly improving the clamping accuracy, enhancing the adaptability of the device to samples of different specifications, and further ensuring the reliability and accuracy of the compression test data.

[0052] Importantly, it should be noted that the constructions and arrangements of the present application shown in the various exemplary embodiments are illustrative only. Although only a few embodiments have been described in detail in this disclosure, many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be altered or varied. Accordingly, all such modifications are intended to be included within the scope of the present application. The order or sequence of any process or method steps can be changed or re-sequenced without departing from the generality of the application. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes, and omissions can be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present application. Accordingly, the present application is not limited to particular embodiments described, but extends to various modifications that nevertheless fall within the scope of the appended claims.

[0053] Furthermore, in order to provide a concise description of illustrative embodiments, not all features of an actual implementation can be described (that is, not all implementations can also be described with respect to the best mode, and implementations can be practiced with or without the equivalent of the features in the description, included for notation, not limitation, of the claimed invention).

[0054] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalent replaced without departing from the spirit and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A conversion tooling for performing compression tests on a tensile testing machine, characterized in that: include, The upper transfer component (1), the lower transfer component (2) disposed at the bottom of the upper transfer component (1), and the sample positioning component (3) disposed on the upper transfer component (1) and the lower transfer component (2); The upper transfer component (1) and the lower transfer component (2) work together to convert the tensile force of the tensile testing machine into pressure, and the sample positioning component (3) is used to center and position the sample to be tested.

2. The conversion tooling for performing compression tests on a tensile testing machine according to claim 1, characterized in that: The upper transmission component (1) includes an upper pull member (101), a first pin (102) disposed at the bottom end of the upper pull member (101), and upper pull force conversion sleeves (103) respectively sleeved on both sides of the first pin (102).

3. A conversion tooling for performing compression tests on a tensile testing machine according to claim 2, characterized in that: The lower transmission component (2) includes a lower force conversion sleeve (201) nested with the upper force conversion sleeve (103), a second pin (202) penetrating both ends of the lower force conversion sleeve (201), and a lower pull member (203) sleeved on the outer surface of the second pin (202).

4. A conversion tooling for performing compression tests on a tensile testing machine according to claim 3, characterized in that: The sample positioning assembly (3) includes two sample positioning holes (301) that pass through both ends of the upper tension conversion sleeve (103) and the lower tension conversion sleeve (201), positioning grooves (303) that are respectively opened in the inner cavities of the upper tension conversion sleeve (103) and the lower tension conversion sleeve (201), and a sample positioning mark (304) provided on the inner surface of the positioning groove (303).

5. A conversion tooling for performing compression tests on a tensile testing machine according to claim 4, characterized in that: The sample positioning assembly (3) further includes positioning nuts (302) symmetrically arranged on the two sample positioning holes (301), and the positioning nuts (302) are threadedly engaged with the sample positioning holes (301).

6. A conversion tooling for performing compression tests on a tensile testing machine according to claim 5, characterized in that: The top end of the upper pull member (101) and the bottom end of the lower pull member (203) are respectively provided with threaded heads that connect to the upper and lower clamp interfaces of the tensile testing machine.

7. A conversion tooling for performing compression tests on a tensile testing machine according to claim 6, characterized in that: Both the upper tension conversion sleeve (103) and the lower tension conversion sleeve (201) are U-shaped, and their U-shaped inner walls fit tightly together and can slide relative to each other.

8. A conversion tooling for performing compression tests on a tensile testing machine according to claim 7, characterized in that: The upper pull member (101) is rotatably connected to the upper pull force conversion sleeve (103) via the first pin (102), and the lower pull member (203) is rotatably connected to the lower pull force conversion sleeve (201) via the second pin (202).

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