A specimen centering fixture for a semi-circular bend test

Abstract

The utility model provides a kind of sample centering fixture for semicircular bending test, belong to material detection technical field, including bottom plate, it has a horizontal upper end face on it;Transverse positioning mechanism, it is located on the upper end face of bottom plate and is used to fix the transverse position of sample material;Longitudinal positioning mechanism, it includes two centering uprights longitudinally slidingly arranged on the upper end face of bottom plate, two abutting pieces are used to adjust the longitudinal position of sample material;Towing assembly, it is connected between two abutting pieces, and towing assembly is used to tow two abutting pieces relative sliding or opposite sliding;The utility model can adjust the position of sample material by longitudinal positioning mechanism cooperation transverse positioning mechanism, so that sample material can be located in the central position directly below loading assembly, and then the accuracy of test result can be effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of material testing equipment technology, specifically to a sample centering fixture for a semi-circular bending test. Background Technology

[0002] In the field of materials mechanical property testing, the semi-circular bending test is an important method for evaluating crack resistance. The accuracy of its test results is highly dependent on the centering accuracy of the specimen.

[0003] Publication number CN214201022U discloses a universal fixture for three-point bending and semi-circular bending tests of asphalt mixtures. This device can test semi-circular sample materials of different diameters.

[0004] Although the above-mentioned equipment can be used for testing, it only uses two sliders to position the two sides of the sample material of different diameters. It only achieves lateral (left-right) positioning through the two sliders and lacks precise control over the longitudinal (front-back) direction of the sample. This makes the sample prone to displacement during loading and affects the uniformity of load distribution. Utility Model Content

[0005] In view of this, the present invention provides a specimen centering fixture for a semi-circular bending test. The present invention can adjust the position of the specimen material by using a longitudinal positioning mechanism in conjunction with a transverse positioning mechanism, so that the specimen material is located in the center position directly below the loading component, thereby effectively ensuring the accuracy of the test results.

[0006] To solve the above-mentioned technical problems, this utility model provides a specimen centering fixture for a semi-circular bending test, including a base plate with a horizontal upper surface, and the base plate is a cuboid plate structure.

[0007] The lateral positioning mechanism, located on the upper surface of the base plate, is used to fix the lateral position of the sample material.

[0008] The longitudinal positioning mechanism includes two centrally located uprights that slide longitudinally on the upper surface of the base plate, and two abutting members for adjusting the longitudinal position of the sample material.

[0009] The traction assembly is connected between two abutting parts. The traction assembly is used to pull the two abutting parts to slide relative to each other or back to back. When the abutting parts slide relative to each other, they can abut against the front and rear ends of the sample material to make displacement.

[0010] The traction assembly includes a connecting rod hinged to the side of each abutment. The two connecting rods are of the same length, and the end of the connecting rod away from the central clamp can swing toward the side of the base plate and between the opposite abutment. The ends of the two connecting rods away from the abutment are connected to each other by hinge.

[0011] The connection between the two connecting rods has a hinge shaft, and the end of the hinge shaft is provided with a centering slide key. Pulling the centering slide key can pull the two abutting parts to move relative to each other or away from each other.

[0012] Each contact element includes a central upright rod slidably mounted on the base plate. The central upright rods are arranged vertically, and several rotating blades are hinged on the opposite surfaces of the two central upright rods. The end of the rotating blade away from the central upright rod can swing toward both ends of the base plate, and the rotating blade can move against the sample material.

[0013] The lateral positioning mechanism includes a first sliding groove on the upper surface of the base plate, and two support platforms that slide within the first sliding groove. The two support platforms slide relative to each other to clamp the sample material and fix its lateral position.

[0014] The base plate is also equipped with scale markings corresponding to the first slide groove, which facilitates the control of the movement distance and position of the support platform.

[0015] Two central uprights are symmetrically positioned along the first slide groove, and the central slide key is slidably placed within the first slide groove. The first slide groove can be used to guide and limit the central slide key.

[0016] The upper surface of the base plate is provided with a second sliding groove in the longitudinal direction. The second sliding groove and the first sliding groove are arranged perpendicularly and alternately. The central upright is slidably placed in the second sliding groove. Both the second sliding groove and the central upright are T-shaped structures.

[0017] The bottom of the base plate is also equipped with a connector, and the corresponding structure has an interface on the external structural component that is compatible with it. The connector can be inserted into the interface, which makes it easy to disassemble and install the clamping structure.

[0018] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0019] 1. Three-dimensional precise positioning technology:

[0020] By combining the lateral and longitudinal positioning mechanisms, the omnidirectional centering control of the sample material in the horizontal plane is achieved. The lateral positioning mechanism ensures precise left-right centering of the sample through the symmetrical sliding of the double support platforms within the first slide groove; the longitudinal positioning mechanism drives the centering upright to move along the second slide groove via a traction component, achieving automatic centering adjustment of the sample in the front-back direction, effectively solving the load eccentricity problem caused by the unidirectional positioning capability of traditional fixtures.

[0021] 2. Adaptive traction adjustment mechanism:

[0022] The traction assembly employs a double-connecting-rod hinged structure, achieving mechanical balance through the sliding of a central sliding key within the first groove. When the central sliding key is operated, the two connecting rods form an equal-arm lever system, ensuring that the two central uprights on both sides move synchronously towards or away from each other, with precise and controllable stroke. This design ensures uniform distribution of longitudinal positioning force, preventing sample distortion caused by unilateral force application.

[0023] 3. Stress dispersion:

[0024] The blade tip can adaptively swing with the surface contour of the sample, which increases the friction surface between the blade and the side of the sample material, while maintaining the sample's ability to deform freely during loading.

[0025] 4. Modular installation and quick integration:

[0026] The standardized connector at the bottom of the base plate allows for quick connection to the testing machine interface, achieving seamless integration between the fixture and the loading system. Combined with the graduated marking system on the base plate surface, operators can quickly perform coarse and fine adjustments to the initial position of the sample, significantly shortening test preparation time and improving testing efficiency.

[0027] 5. Multi-dimensional compatibility design:

[0028] The vertically staggered layout of the first and second slides ensures structural compactness while enabling independent operation of the lateral and longitudinal positioning mechanisms. The T-shaped slide structure ensures the sliding stability of the central upright and can adapt to the positioning requirements of samples of different thicknesses. Combined with the adjustable range of the support platform, the fixture is suitable for testing semi-circular samples with a wider diameter range. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a specimen centering fixture for a semi-circular bending test according to the present invention;

[0030] Figure 2 This is a top view of the structure of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Base plate; 101. Scale markings;

[0033] 200. Lateral positioning mechanism; 201. First slide groove; 202. Support platform;

[0034] 300. Longitudinal positioning mechanism; 301. Second slide rail;

[0035] 310. Abutting component; 311. Centered upright; 312. Rotating blade;

[0036] 320. Traction assembly; 321. Connecting rod; 322. Centering slide key. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-2 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0038] This embodiment provides a specimen centering fixture for a semi-circular bending test, such as... Figure 1 , 2 As shown: a rectangular base plate 100 is provided on the upper surface of the base plate 100, and a lateral positioning mechanism 200 and a longitudinal positioning mechanism 300 are provided. The lateral positioning mechanism 200 can be used to fix the sample material and adjust the position of the sample material on both sides. Then, the longitudinal positioning mechanism 300 can adjust the front and rear position of the sample material, so that the sample material is located in the center position directly below the loading component. Then, the loading component can be moved down to test the sample material.

[0039] Specifically, the lateral positioning mechanism 200 includes a first sliding groove 201 laterally disposed on the upper surface of the base plate 100, such as... Figure 1 , 2 As shown: Two support platforms 202 are slidably provided in the first groove 201, so that the two support platforms 202 can slide relative to each other to fix sample materials of different diameters. The bottom plate 100 is also provided with scale markings 101 on the side, which can be used to adjust the position of the support platforms 202 and thus indirectly control the position of the sample material.

[0040] Furthermore, the longitudinal positioning mechanism 300 includes a second groove 301 longitudinally disposed on the upper surface of the base plate 100, such as... Figure 2 As shown: the second slide groove 301 is arranged perpendicularly to the first slide groove 201 and is connected to the first slide groove 201. Two abutment members 310 are slidably provided in the second slide groove 301. The two abutment members 310 are symmetrically arranged along the first slide groove 201. When the two abutment members 310 slide relative to each other, the outer surface of the abutment members 310 can abut against the front and rear end faces of the sample material, thereby adjusting the front and rear position of the sample material. This allows the sample material to be located in the center position directly below the loading component.

[0041] Preferably, the abutment 310 includes a central upright 311 that is slidably placed within the second groove 301, such as... Figure 1 , 2As shown: Both the centering rod 311 and the second sliding groove 301 are T-shaped structures, meaning that the centering rod 311 will not tilt or fall out of the second sliding groove 301 during the sliding process. The top of the centering rod 311 is located below the bottom horizontal plane of the sample material, and the top of the opposite sides of the two centering rods 311 are hinged with multiple rotating blades 312. The rotating blades 312 can rotate on the side of the centering rod 311. In use, the rotating blades 312 need to be rotated to a vertical position or an upward tilting position, and the top horizontal plane of the rotating blades 312 needs to be higher than the bottom horizontal plane of the sample material. This ensures that the side of the rotating blades 312 can contact the front and rear end faces of the sample material when the centering rod 311 slides. Since the height position of the rotating blades 312 can be adjusted by rotation, it can contact sample materials of different diameters.

[0042] Preferably, a traction assembly 320 is also connected between the two abutting members 310, such as... Figure 1 , 2 As shown: The traction assembly 320 includes connecting rods 321 hinged to the sides of each central upright 311. The two connecting rods 321 are of the same length and can swing with the hinge point as the center plane. The ends of the two connecting rods 321 away from the central upright 311 are connected by a hinge. The hinge point has a vertical hinge axis. Both connecting rods 321 can rotate around the hinge axis. That is, pulling the hinge axis can cause the two connecting rods 321 to rotate and move. In this way, the connecting rods 321 can pull the central upright 311 to move within the second slide groove 301, thereby achieving relative or opposite movement of the contact member 310. The bottom of the hinge axis is also connected to a central sliding key 322, which is located within the first slide groove 201. That is, the rotational displacement process of the two connecting rods 321 can be indirectly guided through the first slide groove 201 and the central sliding key 322.

[0043] It is worth mentioning that the bottom of the base plate 100 is also provided with a connector. The corresponding structure has an interface on the external structural component that is compatible with it. The connector can be inserted into the interface. Both the connector and the interface are polygonal columnar structures, so that the base will not rotate on the external structural component. In this embodiment, the cross-section of the connector and the interface are both rectangular structures.

[0044] Working principle:

[0045] In use, first place the sample material between the two support platforms, then slide the support platforms according to the scale markings to fix the sample material directly below the loading component. Then, move the centering slider, which will indirectly move the two centering uprights relative to each other through the connecting rod. This will allow the rotating blades to adjust the front and rear positions of the sample material against the front and rear ends, so that the sample material is located directly below the loading component in the center. Finally, after resetting the centering uprights by using the centering slider, you can control the loading component to test the sample material.

[0046] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A specimen centering fixture for a semi-circular bending test, comprising: The base plate (100) has a horizontal upper surface; A lateral positioning mechanism (200), located on the upper surface of the base plate (100), is used to fix the lateral position of the sample material; characterized in that: Also includes; The longitudinal positioning mechanism (300) includes two abutting members (310) that are longitudinally slidably disposed on the upper end surface of the base plate (100). The two abutting members (310) are used to adjust the longitudinal position of the sample material. A traction assembly (320) is connected between two abutments (310) for pulling the two abutments (310) to slide relative to each other or in opposite directions.

2. The specimen centering fixture for a semi-circular bending test as described in claim 1, characterized in that: The traction assembly (320) includes a connecting rod (321) hinged to the side of each abutment (310). The end of the connecting rod (321) away from the centering clamp can swing towards the side of the base plate and between the opposite abutment (310). The ends of the two connecting rods (321) away from the abutment (310) are connected to each other by hinge.

3. The specimen centering fixture for a semi-circular bending test as described in claim 2, characterized in that: The connection between the two connecting rods (321) has a hinge shaft with a central sliding key (322) at the end of the hinge shaft.

4. The specimen centering fixture for a semi-circular bending test as described in claim 3, characterized in that: Each abutment (310) includes a central upright (311) slidably disposed on the base plate (100). Several rotating blades (312) are also hinged on the opposite surfaces of the two central uprights (311). The end of the rotating blade (312) away from the central upright (311) can swing toward both ends of the base plate.

5. A specimen centering fixture for a semi-circular bending test as described in any one of claims 1-4, characterized in that: The lateral positioning mechanism (200) includes a first sliding groove (201) provided laterally on the upper surface of the base plate (100), and two support platforms (202) are slidably provided in the first sliding groove (201).

6. The specimen centering fixture for a semi-circular bending test as described in claim 5, characterized in that: The base plate (100) is also provided with scale markings (101) corresponding to the first slide groove (201).

7. A specimen centering fixture for a semi-circular bending test as described in claim 5, characterized in that: Two centrally located uprights (311) are symmetrically positioned along the first slide groove (201) and are slidably placed in the first slide groove (201) by a centrally located slide key (322).

8. A specimen centering fixture for a semi-circular bending test as described in claim 5, characterized in that: The upper surface of the base plate (100) is provided with a second sliding groove (301) in the longitudinal direction. The second sliding groove (301) and the first sliding groove (201) are arranged perpendicularly and staggered to each other. The central upright rod (311) is slidably placed in the second sliding groove (301).

9. A specimen centering fixture for a semi-circular bending test as described in any one of claims 1-4, characterized in that: The bottom of the base plate is also provided with a connector, and the corresponding structure has an interface on the external structural component that is compatible with it. The connector can be inserted into the interface.

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