A centering device for tensile test specimens

Abstract

The utility model discloses a kind of centering devices of tensile test sample, belong to tensile test auxiliary technical field, including upper centering device and lower centering device, respectively to the upper part and lower part of sample parallel section are centered and limited;Upper centering device and lower centering device all include base, horizontal adjusting unit, vertical adjusting unit, rotary adjusting unit and centering block;Horizontal adjusting unit, vertical adjusting unit and rotary adjusting unit are all set on base;Base is detachably mounted on testing machine beam;Horizontal adjusting unit, vertical adjusting unit and rotary adjusting unit are respectively used for adjusting centering block in horizontal direction, vertical direction and circumferential direction.The utility model of a kind of centering devices of tensile test sample, can effectively solve the centering device of prior art when being centered to sample parallel section, require that tensile testing machine must satisfy the space required for centering device installation, and then caused tensile testing machine test space waste and other problems.

Description

Technical Field

[0001] This utility model belongs to the field of auxiliary technology for tensile testing. Specifically, it relates to a centering device for a tensile test specimen. Background Technology

[0002] Tensile testing is one of the fundamental methods for testing the mechanical properties of materials and is an important basis for product quality assessment, new material research and development, and process adjustment. During tensile testing, the tensile specimen is typically aligned using an alignment device mounted on a beam or clamp, i.e., alignment is achieved through the specimen clamping end. However, this method requires precision machining of the specimen clamping end. Without precision machining, the specimen may not be on the same axis, leading to deviations in test results and potentially causing deformation and damage to the alignment device. However, precision machining of the specimen clamping end undoubtedly increases the amount of machining required.

[0003] In recent years, researchers have begun to explore using the parallel segments of tensile specimens for alignment, as these segments require precision machining. Alignment using these parallel segments during tensile testing ensures the specimens are aligned on the same axis. While this method guarantees accurate specimen alignment, it places new demands on the testing space. The alignment device, mounted on the upper or lower beams or clamps, must be at a certain height to align with the parallel segments, requiring the tensile testing machine to accommodate this space. This results in wasted testing space and inconvenient operation. Utility Model Content

[0004] The purpose of this invention is to provide a centering device for tensile test specimens that addresses the aforementioned shortcomings. This solves the problems of existing centering devices requiring sufficient space within the tensile testing machine for installation when aligning the parallel sections of the specimen, leading to wasted testing space and inconvenient operation. To achieve the above objective, this invention provides the following technical solution: A centering device for a tensile test specimen includes an upper centering device and a lower centering device, which respectively center and limit the upper and lower portions of the parallel section of the specimen. Both the upper and lower centering devices include a base, a horizontal adjustment unit, a vertical adjustment unit, a rotation adjustment unit, and a centering block. The horizontal, vertical, and rotation adjustment units are all mounted on the base. The base is detachably mounted on the crossbeam of the testing machine. The horizontal, vertical, and rotation adjustment units are used to adjust the centering block in the horizontal, vertical, and circumferential directions, respectively.

[0005] Furthermore, the rotation adjustment unit includes a rotating base; the rotating base is rotatably connected to the base and can be stopped at any angle; the rotating base is fixedly connected to the vertical adjustment unit.

[0006] Furthermore, the vertical adjustment unit includes a sleeve and a vertical position adjustment rod; the bottom of the sleeve is fixedly connected to the rotating base and is perpendicular to the base; the diameter of the vertical position adjustment rod is similar to that of the sleeve and can slide up and down inside the sleeve; the side wall of the sleeve is provided with a threaded hole; the threaded hole is fitted with upper and lower locking bolts for fixing the vertical position adjustment rod.

[0007] Furthermore, the vertical position adjustment rod is equipped with a vertical position scale for precisely adjusting the position of the vertical position adjustment rod.

[0008] Furthermore, the horizontal adjustment unit includes a centering adjustment rod; the centering adjustment rod has a "T" shaped structure, with its wider end being a centering block; the centering block is a cuboid that can be in close contact with the sample.

[0009] Furthermore, the upper part of the vertical position adjusting rod is provided with a through hole; the through hole is horizontally set; the centering adjusting rod can slide horizontally in the through hole.

[0010] Furthermore, a fixing bolt is fitted at the top of the upper and lower position adjusting rod to fix the position of the centering adjusting rod on the upper and lower position adjusting rod.

[0011] Furthermore, the centering adjustment rod is equipped with a front and rear position scale for precise adjustment of the position of the centering adjustment rod.

[0012] Furthermore, both sides of the base are fitted with fixing bolts for engaging with the crossbeam of the testing machine to fix the base onto the crossbeam.

[0013] Furthermore, the centering blocks of the upper centering device and the lower centering device are respectively aligned with the upper and lower portions of the parallel section of the sample, and the line connecting the centering blocks of the upper centering device and the lower centering device is parallel to the axial test force of the testing machine.

[0014] The beneficial effects of this utility model are: This utility model discloses a centering device for tensile test specimens. By making the upper and lower position adjustment rods and the centering adjustment rod adjustable, it positions the tensile specimen along its parallel length, achieving precise centering. Furthermore, after centering, the centering device can be adjusted away from the test space, thus enabling accurate testing of the tensile specimens while effectively solving the problem of existing centering devices occupying test space. The overall structure is simple and easy to operate, reducing processing costs and improving testing efficiency. Attached Figure Description

[0015] Figure 1 This is a front view of the upper or lower centering device of this utility model; Figure 2 This is a side view of the upper centering device or the lower centering device of this utility model; In the attached diagram: 1. Up and down position adjustment rod; 2. Centering locking bolt; 3. Centering adjustment rod; 4. Centering block; 5. Up and down position scale; 6. Sleeve; 7. Up and down locking bolt; 8. Base; 9. Fixing bolt; 10. Front and rear position scale; 11. Rotating base. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0017] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0019] In the description of this utility model, "multiple" means two or more.

[0020] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0021] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0022] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] Example 1 See attached Figures 1-2 This embodiment discloses a centering device for a tensile test specimen, including an upper centering device and a lower centering device with identical structures. These two devices respectively center and limit the upper and lower portions of the parallel section of the specimen. Specifically, both the upper and lower centering devices include a base 8. The base 8 is designed to fit the crossbeam structure of the testing machine, and symmetrical fixing bolts 9 are arranged on both sides of its bottom. These fixing bolts 9 are threadedly connected to the base 8, allowing for detachable installation of the base 8 and the crossbeam of the testing machine by rotating the fixing bolts 9. During installation, the base 8 of the upper centering device is fixed to the back of the upper crossbeam of the testing machine, and the base 8 of the lower centering device is fixed to the back of the lower crossbeam of the testing machine. Threaded holes are machined at corresponding positions on the upper and lower crossbeams of the testing machine to engage with the fixing bolts 9 for a secure connection, while simultaneously ensuring a tight fit between the base 8 and the surface of the crossbeam, without any loosening or tilting.

[0024] In one embodiment, both the upper centering device and the lower centering device include a rotation adjustment unit, which is the core component for realizing circumferential adjustment. The rotation base 11 is embedded inside the base 8 and adopts a rotatable connection structure. Specifically, it can be achieved through bearing engagement or precision sliding engagement, ensuring that the rotation base 11 can rotate freely 360 degrees within the base 8 and can be stably stopped at any angle without the need for additional positioning buckles to maintain the current angle position.

[0025] In one embodiment, both the upper and lower centering devices include a vertical adjustment unit, which comprises a sleeve 6 and a vertical position adjustment rod 1. The upper part of the rotating base 11 is fixedly connected to the bottom of the sleeve 6, preferably by welding or bolting, to ensure the firmness of the connection and prevent relative displacement during adjustment. When circumferential adjustment of the device is required, the operator can directly twist the sleeve 6 by hand. The sleeve 6, through its fixed connection with the rotating base 11, drives the entire vertical adjustment unit, horizontal adjustment unit, and centering block 4 to rotate synchronously, thereby achieving circumferential position adjustment of the centering block 4. The sleeve 6 has a hollow columnar structure. After its bottom is fixedly connected to the rotating base 11, the entire sleeve 6 is vertically distributed with the base 8, ensuring that the sliding direction of the vertical position adjustment rod 1 is perpendicular to the base 8. The diameter of the vertical position adjustment rod 1 is approximately equal to the inner diameter of the sleeve 6, and the two are fitted with a clearance, allowing the vertical position adjustment rod 1 to slide smoothly up and down inside the sleeve 6, achieving stepless adjustment in the height direction. A through threaded hole is provided on the side wall of the sleeve 6. This threaded hole is threadedly engaged with the upper and lower locking bolts 7. One end of the upper and lower locking bolts 7 passes through the threaded hole and can tightly abut against the side wall of the upper and lower position adjusting rod 1. When the upper and lower position adjusting rod 1 slides to the target height, the upper and lower locking bolts 7 are tightened, and the upper and lower position adjusting rod 1 is fixed by the friction between the bolts and the side wall of the adjusting rod.

[0026] In one embodiment, to achieve precise vertical positioning, a vertical position scale 5 is engraved on the vertical position adjusting rod 1, which is set along the length of the vertical position adjusting rod 1. The operator can quickly adjust the vertical position adjusting rod 1 of the upper and lower centering devices to the corresponding height by referring to the scale of the vertical position scale 5, based on the height dimensions of the parallel section of the sample, ensuring that the centering block 4 of the upper centering device is aligned with the upper part of the parallel section of the sample, and the centering block 4 of the lower centering device is aligned with the lower part of the parallel section of the sample.

[0027] In one embodiment, both the upper and lower centering devices include a horizontal adjustment unit. This unit adjusts the centering block 4 horizontally to ensure it is tightly fitted and aligned with the parallel section of the sample. The unit includes a centering adjustment rod 3 and the centering block 4. The centering adjustment rod 3 has a "T" shape, with the wider end integrally formed or fixedly connected to the centering block 4. The centering block 4 is designed as a cuboid, with a width greater than that of the centering adjustment rod 3. This increases the contact area with the parallel section of the sample, improving the stability of the centering and preventing sample displacement due to an insufficiently small contact point. A horizontally oriented through hole is provided at the top of the upper position adjustment rod 1. The shape of this through hole perfectly matches the cross-sectional shape of the centering adjustment rod 3. After passing through this through hole, the centering adjustment rod 3 can slide freely horizontally, enabling stepless adjustment of the centering block 4 in the front-to-back direction. The top of the vertical adjustment rod 1 is provided with a threaded hole, which is threadedly engaged with the centering locking bolt 2. The lower end of the centering locking bolt 2 passes through the threaded hole and abuts against the upper surface of the centering adjustment rod 3. After the centering adjustment rod 3 is adjusted to the target position, the centering locking bolt 2 is tightened. The pressure of the bolt fixes the position of the centering adjustment rod 3, preventing it from sliding during the test.

[0028] In one embodiment, to achieve precise horizontal adjustment, a front-to-back position scale 10 is engraved on the centering adjustment rod 3. This scale is set along the length of the centering adjustment rod 3 and is consistent with the sliding direction of the through hole. The operator can refer to the scale of the front-to-back position scale 10 to fine-tune the front-to-back position of the centering adjustment rod 3 so that the end face of the centering block 4 is in close contact with the side of the parallel section of the sample.

[0029] The centering blocks 4 of the upper and lower centering devices are aligned with the upper and lower parts of the parallel section of the specimen, respectively. Since the two devices have identical structures and adjustment methods, synchronous adjustment ensures that the line connecting the two centering blocks 4 is parallel to the axial test force direction of the testing machine. This dual-point centering method can limit the specimen from both upper and lower positions, effectively preventing lateral displacement or torsion of the specimen during tensile testing. It ensures that the geometric center of the specimen remains coaxial with the axial test force center of the testing machine, avoiding test errors caused by eccentric tension.

[0030] Specific implementation principle: The base 8 of the upper centering device is installed on the back of the upper crossbeam of the testing machine using fixing bolts 9 on both sides, and the base 8 of the lower centering device is installed on the back of the lower crossbeam of the testing machine. Ensure that the base 8 is firmly fixed without any loosening, and that the entire device is located outside the testing space. According to the installation direction of the sample and the testing requirements, the sleeve 6 is twisted to drive the rotating base 11 to rotate within the base 8, adjusting the circumferential position of the upper and lower centering devices so that the orientation of the centering block 4 corresponds to the side of the parallel section of the sample. After adjustment, the rotating base 11 can maintain its current angle. Referring to the upper and lower position scale 5, the upper and lower position adjusting rods 1 of the upper and lower centering devices are adjusted so that the centering block 4 of the upper centering device is aligned with the upper part of the parallel section of the sample, and the centering block 4 of the lower centering device is aligned with the lower part of the parallel section of the sample. After adjustment, the upper and lower locking bolts 7 are tightened to fix the height of the upper and lower position adjusting rods 1. ; Referring to the front and rear position scale 10, adjust the centering adjustment rods 3 of the upper and lower centering devices respectively, so that the end faces of the two centering blocks 4 are in close contact with the sides of the parallel section of the specimen, and the centers of the two centering blocks 4 are on the same horizontal line as the center of the parallel section of the specimen. After adjustment, tighten the centering locking bolts 2 to fix the position of the centering adjustment rods 3. Clamp both ends of the specimen in the upper and lower clamps of the testing machine respectively. During clamping, ensure that the upper and lower parts of the parallel section of the specimen are in contact with the centering blocks 4 of the upper and lower centering devices respectively. Start the tensile testing machine, and the upper and lower clamps of the testing machine apply axial tension. After the test, loosen the centering locking bolts 2 of the upper and lower centering devices and push the centering adjustment rods 3 back to the initial position. Loosen the upper and lower locking bolts 7 and retract the upper and lower position adjustment rods 1 into the sleeve 6. Twist the sleeve 6 to remove the entire adjustment mechanism from the test space of the equipment without occupying test space. The operation of each adjustment unit is simple and convenient, requiring no complicated tools or professional skills, which significantly improves the testing efficiency.

[0031] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

Claims

1. A centering device for a tensile test specimen, characterized in that: It includes an upper centering device and a lower centering device, which respectively center and limit the upper and lower parts of the parallel section of the sample; the upper centering device and the lower centering device each include a base (8), a horizontal adjustment unit, a vertical adjustment unit, a rotation adjustment unit and a centering block (4); the horizontal adjustment unit, the vertical adjustment unit and the rotation adjustment unit are all set on the base (8); the base (8) is detachably installed on the crossbeam of the testing machine; the horizontal adjustment unit, the vertical adjustment unit and the rotation adjustment unit are respectively used to adjust the centering block (4) in the horizontal direction, the vertical direction and the circumferential direction.

2. The centering device for a tensile test specimen according to claim 1, characterized in that: The rotation adjustment unit includes a rotating base (11); the rotating base (11) is rotatably connected to the base (8) and can be stopped at any angle; the rotating base (11) is fixedly connected to the vertical adjustment unit.

3. The centering device for a tensile test specimen according to claim 2, characterized in that: The vertical adjustment unit includes a sleeve (6) and an up-down position adjustment rod (1); the bottom of the sleeve (6) is fixedly connected to the rotating base (11) and is perpendicular to the base (8); the diameter of the up-down position adjustment rod (1) is similar to that of the sleeve (6) and can slide up and down inside the sleeve (6); the side wall of the sleeve (6) is provided with a threaded hole; the threaded hole is fitted with an upper and lower locking bolt (7) for fixing the up-down position adjustment rod (1).

4. The centering device for a tensile test specimen according to claim 3, characterized in that: The upper and lower position adjustment rod (1) is provided with an upper and lower position scale (5) for precisely adjusting the position of the upper and lower position adjustment rod (1).

5. The centering device for a tensile test specimen according to claim 3, characterized in that: The horizontal adjustment unit includes a centering adjustment rod (3); the centering adjustment rod (3) has a "T" shaped structure, and its wider end is a centering block (4); the centering block (4) is a cuboid that can be in close contact with the sample.

6. The centering device for a tensile test specimen according to claim 5, characterized in that: The upper part of the vertical position adjustment rod (1) is provided with a through hole; the through hole is horizontally set; the centering adjustment rod (3) can slide horizontally in the through hole.

7. The centering device for a tensile test specimen according to claim 5, characterized in that: The top of the upper and lower position adjusting rod (1) is fitted with a fixing bolt (9) to fix the position of the centering adjusting rod (3) on the upper and lower position adjusting rod (1).

8. The centering device for a tensile test specimen according to claim 5, characterized in that: The centering adjustment rod (3) is provided with a front and rear position scale (10) for precise adjustment of the position of the centering adjustment rod (3).

9. The centering device for a tensile test specimen according to claim 1, characterized in that: The base (8) is fitted with fixing bolts (9) on both sides, which are used to cooperate with the crossbeam of the testing machine to fix the base (8) on the crossbeam of the testing machine.

10. The centering device for a tensile test specimen according to claim 1, characterized in that: The centering blocks (4) of the upper centering device and the lower centering device are aligned with the upper and lower parts of the parallel section of the sample, respectively, and the line connecting the centering blocks (4) of the upper centering device and the lower centering device is parallel to the axial test force of the testing machine.

Images