Automatic sample centering device of tension testing machine

Abstract

The utility model provides an automatic sample centering device of a tensile testing machine, which comprises the tensile testing machine, a tensile shell is fixedly mounted at the top of the tensile testing machine, a sliding groove is formed in one side of the tensile shell, a fixed base is fixedly mounted on the inner wall of the bottom of the sliding groove, and a clamping groove is formed in the bottom of the fixed base. A sliding block base is installed on the inner side of the sliding groove in a sliding mode. Clamping shells are fixedly mounted on one side of the sliding block base and one side of the fixed base, clamping mechanisms are arranged on the inner sides of the two clamping shells, a centering shell is fixedly mounted on the outer side of the clamping shell located on the fixed base, and a centering mechanism is arranged on the inner side of the centering shell. According to the automatic sample centering device of the tensile testing machine, the sample can be clamped and prevented from loosening in a tensile test, the V-shaped groove is formed in one side of the clamp, the automatic sample centering device can adapt to samples in different shapes, sample centering can be rapidly and accurately completed, the preparation time before the test is greatly saved, and the test efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of tensile testing machines and relates to an automatic specimen centering device for tensile testing machines. Background Technology

[0002] A tensile testing machine, also known as a universal testing machine or electronic tensile testing machine, is an instrument used to test the mechanical properties of various materials, including tensile, compression, bending, and shear tests. Its main working principle involves a motor-driven transmission device that applies tensile or compressive force to the sample at a certain speed through a clamp. Simultaneously, a force sensor precisely measures the force applied to the sample, and a displacement sensor measures the deformation of the sample during the stress process. The machine's control system collects force and deformation data in real time and precisely controls and processes the test process according to a preset test plan and relevant standards. Ultimately, it obtains various mechanical property indicators of the material, such as tensile strength, yield strength, elongation, and elastic modulus. Tensile testing machines are widely used in material research and development, quality control, and performance testing in many fields, including metals, plastics, rubber, fibers, building materials, and automotive parts.

[0003] When performing tensile tests, the operator needs to manually place the sample on the fixture below and center it. However, the traditional manual centering method requires the operator to spend a lot of time adjusting the position of the sample to ensure centering accuracy, which greatly affects the test efficiency. Utility Model Content

[0004] The purpose of this invention is to provide an automatic specimen centering device for a tensile testing machine, which aims to solve the problem of excessive time wasted by manual centering.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an automatic specimen centering device for a tensile testing machine, comprising a tensile testing machine, a tensile housing fixedly installed on the top of the tensile testing machine, a sliding groove provided on one side of the tensile housing, a fixed base fixedly installed on the bottom inner wall of the sliding groove, and a slider base slidably installed on the inner side of the sliding groove; a clamping housing fixedly installed on one side of both the slider base and the fixed base, a clamping mechanism provided on the inner side of both clamping housings, a centering housing fixedly installed on the outer side of the clamping housing located on the fixed base, a centering mechanism provided on the inner side of the centering housing, and a centering hole provided on the top of the centering housing for placing the specimen.

[0006] A further feature of this invention is that a ball screw is rotatably mounted on the top inner wall of the sliding groove, and the slider base is threaded onto the ball screw.

[0007] By adopting the above technical solution, it is convenient to move the slider base by driving the ball screw.

[0008] A further feature of this invention is that a motor slot is provided inside the tensile housing, and a servo motor is fixedly installed on one inner wall of the motor slot, with the output shaft of the servo motor being fixedly connected to a ball screw.

[0009] By adopting the above technical solution, a servo motor can drive the ball screw to rotate.

[0010] A further feature of this invention is that a cylinder is fixedly installed on the bottom inner wall of each of the two clamp housings.

[0011] By adopting the above technical solution, it is convenient to clamp the sample by using a cylinder-driven clamping mechanism.

[0012] The present invention is further configured such that: the clamping mechanism includes a linkage base, two linkage columns, two cranks and two clamping assemblies; the linkage base is fixedly installed on the output end of the cylinder; the top of the linkage base is provided with a linkage groove; two linkage columns are fixedly installed on one inner wall of the linkage groove; cranks are rotatably sleeved on both linkage columns; and clamping assemblies are provided at one end of both cranks.

[0013] By adopting the above technical solution, it is convenient to move the corresponding clamp assembly by driving it through two cranks.

[0014] A further feature of this invention is that the clamp assembly includes a fixed post, a crank post, and a clamp. The fixed post is fixedly installed on one inner wall of the clamp housing, and the clamp is rotatably sleeved on the fixed post. A connecting groove is provided at one end of the clamp, and a crank post is fixedly installed on one inner wall of the connecting groove. The crank is rotatably sleeved on the crank post.

[0015] By adopting the above technical solution, it is easy to restrict the movement trajectory of the clamp, so that it can only rotate around the fixed post.

[0016] A further feature of this invention is that a V-shaped groove is provided on one side of the clip.

[0017] By adopting the above technical solution, the sample can be clamped better.

[0018] A further feature of this invention is that four guide grooves are provided on the top inner wall of the centering shell, and guide metal blocks are slidably installed on the inner side of each of the four guide grooves.

[0019] By adopting the above technical solution, it is easy to restrict the movement trajectory of the four moving metal blocks.

[0020] The present invention is further configured such that: the centering mechanism includes four movable metal blocks, four centering metal blocks and four linkage bars; the bottom of each of the four guide metal blocks is fixedly installed with a movable metal block; the four movable metal blocks are slidably installed on the bottom inner wall of the centering housing; one side of each of the four movable metal blocks is fixedly installed with a centering metal block; linkage holes are provided on both sides of each of the four movable metal blocks; and corresponding linkage bars are slidably installed on the inner side of each of the multiple linkage holes.

[0021] By adopting the above technical solution, the corresponding moving metal block can be moved by the linkage bar.

[0022] A further feature of this invention is that a nut is fixedly inserted through one side of the centering shell, and a threaded rod is threadedly connected to the inner side of the nut. One end of the threaded rod, which extends into the centering shell, is rotatably connected to the corresponding movable metal block.

[0023] By adopting the above technical solution, it is convenient to move the corresponding moving metal block by driving the threaded rod.

[0024] This application includes at least one of the following beneficial technical effects:

[0025] 1. This application utilizes a clamping mechanism consisting of a linkage base and a clamp to clamp the sample, preventing it from coming loose during tensile testing. Furthermore, one side of the clamp is designed with a V-groove to accommodate samples of different shapes, thus increasing the applicability of the equipment.

[0026] 2. This application utilizes a centering mechanism consisting of a centering shell and a centering metal block, which enables rapid and accurate sample centering, greatly saving preparation time before the test and improving test efficiency. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0028] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0029] Figure 3 This is a three-dimensional cross-sectional view of the clamping mechanism of this utility model;

[0030] Figure 4 This is a three-dimensional cross-sectional schematic diagram of the centering mechanism of this utility model;

[0031] Figure 5 This is a three-dimensional structural disassembly diagram of the centering mechanism of this utility model.

[0032] The components are as follows: 1. Tensile testing machine; 2. Tensile housing; 3. Ball screw; 4. Slider base; 5. Servo motor; 6. Clamp housing; 7. Cylinder; 8. Linkage base; 9. Linkage column; 10. Crank; 11. Crank column; 12. Fixed column; 13. Clamp; 14. Centering housing; 15. Guide metal block; 16. Moving metal block; 17. Centering metal block; 18. Linkage bar; 19. Nut; 20. Threaded rod; 21. Fixed base. Detailed Implementation

[0033] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the automatic specimen centering device for a tensile testing machine according to this utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, used only to facilitate and clarify the illustration of the embodiments of this utility model. The same or similar reference numerals in the drawings represent the same or similar parts.

[0034] Reference Figure 1-5 An automatic specimen centering device for a tensile testing machine includes a tensile testing machine 1. A tensile housing 2 is fixedly installed on the top of the tensile testing machine 1. A sliding groove is provided on one side of the tensile housing 2. A fixed base 21 is fixedly installed on the bottom inner wall of the sliding groove. A slider base 4 is slidably installed on the inner side of the sliding groove. A clamping housing 6 is fixedly installed on one side of both the slider base 4 and the fixed base 21. A clamping mechanism is provided on the inner side of both clamping housings 6. A centering housing 14 is fixedly installed on the outer side of the clamping housing 6 located on the fixed base 21. A centering mechanism is provided on the inner side of the centering housing 14. A centering hole is provided on the top of the centering housing 14 for placing the specimen.

[0035] In this embodiment, a ball screw 3 is rotatably mounted on the top inner wall of the sliding groove, and a slider base 4 is threaded onto the ball screw 3, so that the slider base 4 can be moved by the ball screw 3.

[0036] In this embodiment, a motor slot is provided inside the tension housing 2, and a servo motor 5 is fixedly installed on one inner wall of the motor slot. The output shaft of the servo motor 5 is fixedly connected to the ball screw 3, and the ball screw 3 can be rotated by the servo motor 5.

[0037] In this embodiment, cylinders 7 are fixedly installed on the bottom inner walls of both clamp housings 6, so that the clamping mechanism can be driven by the cylinders 7 to clamp the sample.

[0038] In this embodiment, the clamping mechanism includes a linkage base 8, two linkage columns 9, two cranks 10, and two clamping assemblies. The linkage base 8 is fixedly installed on the output end of the cylinder 7. A linkage groove is opened on the top of the linkage base 8. Two linkage columns 9 are fixedly installed on one inner wall of the linkage groove. A crank 10 is rotatably sleeved on each of the two linkage columns 9. A clamping assembly is provided at one end of each of the two cranks 10, so that the corresponding clamping assembly can be moved by driving the two cranks 10.

[0039] In this embodiment, the clamp assembly includes a fixed post 12, a crank post 11, and a clamp 13. The fixed post 12 is fixedly installed on one inner wall of the clamp housing 6. The clamp 13 is rotatably sleeved on the fixed post 12. A connecting groove is provided at one end of the clamp 13. The crank post 11 is fixedly installed on one inner wall of the connecting groove. The crank 10 is rotatably sleeved on the crank post 11, which facilitates the restriction of the movement trajectory of the clamp 13, so that it can only rotate around the fixed post 12.

[0040] In this embodiment, a V-shaped groove is provided on one side of the clamp 13, which can better hold the sample.

[0041] In this embodiment, four guide grooves are provided on the top inner wall of the outer shell 14, and guide metal blocks 15 are slidably installed on the inner side of each of the four guide grooves to facilitate the restriction of the movement trajectory of the four moving metal blocks 16.

[0042] In this embodiment, the centering mechanism includes four movable metal blocks 16, four centering metal blocks 17, and four linkage bars 18. The bottom of each of the four guide metal blocks 15 is fixedly equipped with a movable metal block 16. The four movable metal blocks 16 are slidably installed on the bottom inner wall of the centering housing 14. The centering metal block 17 is fixedly installed on one side of each of the four movable metal blocks 16. Linkage holes are provided on both sides of each of the four movable metal blocks 16. Corresponding linkage bars 18 are slidably installed on the inner side of each linkage hole. The corresponding movable metal block 16 can be moved by the linkage bars 18.

[0043] In this embodiment, a nut 19 is fixedly inserted through one side of the centering housing 14, and a threaded rod 20 is threadedly connected to the inner side of the nut 19. One end of the threaded rod 20 extends into the centering housing 14 and is rotatably connected to the corresponding movable metal block 16, so that the corresponding movable metal block 16 can be moved by the threaded rod 20.

[0044] Working principle: During the tensile test, the operator places the sample in the centering hole on the centering housing 14, so that one end of the sample contacts the clamping housing 6 below. Then, the threaded rod 20 is rotated. The threaded rod 20 is threadedly connected to the nut 19. Since the nut 19 is fixed through one side of the centering housing 14, the threaded rod 20 moves axially when it rotates. The movement of the threaded rod 20 drives the corresponding moving metal block 16 to move. The movement of the moving metal block 16 drives the corresponding two linkage bars 18 to move. The movement of the two linkage bars 18 drives the corresponding moving metal block 16 to move. The movement of the two moving metal blocks 16 drives the corresponding linkage bars 18 to move. The movement of the two linkage bars 18 drives the same moving metal block 16 to move. At this time, all four moving metal blocks 16 move. At the same time, guide metal blocks 15 are fixedly installed on the top of each of the four moving metal blocks 16. The four guide metal blocks 15 are slidably installed in the corresponding guide grooves. The movement trajectory is restricted, allowing only forward and backward movement. The movement of the four moving metal blocks 16 drives the corresponding centering metal block 17 to adjust the position of the sample, placing it at the center of the clamp housing 6. Then, the servo motor 5 is activated, driving the ball screw 3 to rotate. The rotation of the ball screw 3 drives the slider base 4 to move to the designated position. At this time, both clamps 13 of the two clamping mechanisms are in contact with the sample. The two cylinders 7 are activated, driving the corresponding linkage base 8 to move. The movement of the two linkage bases 8 drives the corresponding two linkage columns 9 to move. The movement of the four linkage columns 9 drives the corresponding crank 10 to move. The movement of the four cranks 10 drives the corresponding crank column 11 to move, which in turn drives the corresponding clamp 13 to move. However, the four clamps 13 are respectively rotated and sleeved on the corresponding fixed column 12. Therefore, the four clamps 13 can only rotate around the corresponding fixed column 12 in a circular motion to clamp the sample. At this time, the operator can control the equipment to perform a tensile test.

[0045] This utility model provides an automatic specimen centering device for a tensile testing machine: it can clamp the specimen to prevent it from coming loose during the tensile test. One side of the clamp 13 is designed with a V-groove to accommodate specimens of different shapes, which increases the applicability of the equipment. It can also quickly and accurately center the specimen, greatly saving preparation time before the test and improving the test efficiency.

[0046] It should also be noted that all terms such as "set up" and similar descriptive words in this application (especially the specification) indicate that two structures have or exist a connection relationship. However, the specific means by which the two are connected are not limited in detail, and are usually conventional connection methods. That is, the means should be understood as prior art and do not need to be elaborated. For example, "m is set up with n" only indicates that structure m has structure n, and whether the two are connected by welding, riveting, adhesive, or integral molding is within the scope of protection of this application. Similarly, "x is rotatably set up with y" only indicates that y and x can rotate relative to each other, and whether the two are connected by a bearing, or whether y directly passes through x and is rotatably connected to x, or other feasible methods, are all within the scope of protection of this application.

[0047] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. An automatic specimen centering device for a tensile testing machine, characterized in that, The tensile testing machine (1) is provided with a tensile housing (2) fixedly installed on the top of the tensile testing machine (1). A sliding groove is provided on one side of the tensile housing (2). A fixed base (21) is fixedly installed on the bottom inner wall of the sliding groove. A slider base (4) is slidably installed on the inner side of the sliding groove. A clamping shell (6) is fixedly installed on one side of both the slider base (4) and the fixed base (21). A clamping mechanism is provided on the inner side of both clamping shells (6). A centering shell (14) is fixedly installed on the outer side of the clamping shell (6) located on the fixed base (21). A centering mechanism is provided on the inner side of the centering shell (14). A centering hole is opened on the top of the centering shell (14). The centering hole is used to place the sample.

2. The automatic specimen centering device for a tensile testing machine according to claim 1, characterized in that, A ball screw (3) is rotatably mounted on the top inner wall of the sliding groove, and the slider base (4) is threaded onto the ball screw (3).

3. The automatic specimen centering device for a tensile testing machine according to claim 2, characterized in that, The tension housing (2) has a motor slot inside, and a servo motor (5) is fixedly installed on one side of the inner wall of the motor slot. The output shaft of the servo motor (5) is fixedly connected to the ball screw (3).

4. The automatic specimen centering device for a tensile testing machine according to claim 1, characterized in that, Cylinders (7) are fixedly installed on the bottom inner walls of both clip housings (6).

5. The automatic specimen centering device for a tensile testing machine according to claim 4, characterized in that, The clamping mechanism includes a linkage base (8), two linkage columns (9), two cranks (10) and two clamping assemblies. The linkage base (8) is fixedly installed on the output end of the cylinder (7). A linkage groove is opened on the top of the linkage base (8). Two linkage columns (9) are fixedly installed on the inner wall of one side of the linkage groove. Cranks (10) are rotatably sleeved on both linkage columns (9). A clamping assembly is provided at one end of each of the two cranks (10).

6. The automatic specimen centering device for a tensile testing machine according to claim 5, characterized in that, The clamp assembly includes a fixed post (12), a crank post (11), and a clamp (13). The fixed post (12) is fixedly installed on one inner wall of the clamp housing (6). The clamp (13) is rotatably sleeved on the fixed post (12). A connecting groove is provided at one end of the clamp (13). The crank post (11) is fixedly installed on one inner wall of the connecting groove. The crank (10) is rotatably sleeved on the crank post (11).

7. The automatic specimen centering device for a tensile testing machine according to claim 6, characterized in that, A V-shaped groove is provided on one side of the clip (13).

8. The automatic specimen centering device for a tensile testing machine according to claim 1, characterized in that, The top inner wall of the centering shell (14) is provided with four guide grooves, and guide metal blocks (15) are slidably installed on the inner side of each of the four guide grooves.

9. The automatic specimen centering device for a tensile testing machine according to claim 8, characterized in that, The centering mechanism includes four movable metal blocks (16), four centering metal blocks (17), and four linkage bars (18). The bottom of each of the four guide metal blocks (15) is fixedly equipped with a movable metal block (16). The four movable metal blocks (16) are slidably installed on the bottom inner wall of the centering housing (14). The centering metal block (17) is fixedly installed on one side of each of the four movable metal blocks (16). Linkage holes are opened on both sides of each of the four movable metal blocks (16). Corresponding linkage bars (18) are slidably installed on the inner side of each linkage hole.

10. The automatic specimen centering device for a tensile testing machine according to claim 9, characterized in that, A nut (19) is fixedly inserted through one side of the centering shell (14), and a threaded rod (20) is threadedly connected to the inner side of the nut (19). One end of the threaded rod (20) extends into the centering shell (14) and is rotatably connected to the corresponding movable metal block (16).

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