A fatigue test fixture suitable for multi-specimen

Abstract

The utility model relates to the field of fatigue test fixture discloses a kind of fatigue test fixture suitable for multiple specifications samples, including support frame, the upper portion of the support frame is connected with adjusting lever by thread sleeve, the lower portion of the adjusting lever is rotatably connected with extrusion plate, two groups of clamping plates are symmetrically arranged in the inside of support frame, adjusting mechanism is arranged in the outside of support frame, and the adjusting mechanism includes adjusting assembly;The adjusting assembly includes slide column that is slidably connected in the inner wall of support frame, the outside of the slide column is equipped with gasket, and the gasket is provided with multiple groups.In the utility model, the position of clamping plate can be adjusted by the cooperation of sliding groove and slide column, the arc-shaped clamping groove a and clamping groove b on both sides of the middle part of clamping plate can better fit the shape of different specifications samples, more uniform pressure can be provided when clamping sample, sliding or damage of sample due to improper clamping is avoided, the accuracy and reliability of test are improved, and meanwhile, the fixture does not need to be replaced.

Description

Technical Field

[0001] This utility model relates to the field of fatigue testing fixtures, and in particular to a fatigue testing fixture suitable for specimens of various specifications. Background Technology

[0002] In the field of materials mechanical property testing, fatigue testing is the core method for evaluating the fracture resistance of materials or components under alternating loads, and it is widely used in key fields such as aerospace, automotive manufacturing, and mechanical engineering. With the diversification of industrial products, the specifications of test samples exhibit significant differences, including but not limited to bars of different diameters, structural components with irregular cross-sections, and small-sized precision parts.

[0003] Traditional fixtures are typically designed for single-size specimens, such as fixed clamping spacing or only suitable for specific shapes (e.g., flat or rod-shaped). When testing cylindrical specimens of different diameters or small-sized specimens, frequent fixture changes or structural adjustments are required, resulting in low testing efficiency. To address this issue, a fatigue testing fixture suitable for multi-size specimens is proposed. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a fatigue testing fixture suitable for specimens of various specifications, aiming to solve the problems of "poor fixture specification adaptability, insufficient clamping stability and low operating efficiency" in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a fatigue testing fixture suitable for multi-specification specimens, comprising a support frame, an adjusting rod connected to the upper part of the support frame via a threaded sleeve, a pressing plate rotatably connected to the lower part of the adjusting rod, two sets of clamping plates symmetrically arranged on the inner side of the support frame, and an adjusting mechanism arranged on the outer side of the support frame, the adjusting mechanism comprising adjusting components;

[0006] The adjustment assembly includes a sliding column that is slidably connected to the inner wall of the support frame. A gasket is sleeved on the outer side of the sliding column. Multiple sets of gaskets are provided. A spring a is provided on the opposite side of two adjacent sets of gaskets. A slot b and a are respectively opened on both sides of the middle part of the clamping plate. A sliding groove is symmetrically opened through the outer side of the clamping plate. The sliding column slides on the inner side of the sliding groove.

[0007] As a further description of the above technical solution:

[0008] Both slot b and slot a are designed to be arc-shaped.

[0009] As a further description of the above technical solution:

[0010] The gasket contacts the outside of the clamp.

[0011] As a further description of the above technical solution:

[0012] The adjustment mechanism also includes a limiting component, which includes a connecting plate fixedly connected to the outside of the clamping plate. The connecting plate slides on the outside of the support frame. A limiting element is slidably connected to the inner wall of the connecting plate. The limiting element and the connecting plate are elastically connected by a spring b.

[0013] As a further description of the above technical solution:

[0014] The support frame has a slot on its outer side, and the limiting member is inserted into the slot.

[0015] As a further description of the above technical solution:

[0016] The slots are provided in multiple sets.

[0017] As a further description of the above technical solution:

[0018] The upper part of the limiting component is provided with a pull ring.

[0019] As a further description of the above technical solution:

[0020] The extrusion plate slides on the inner wall of the support frame, and the lower part of the extrusion plate contacts the surface of the clamping plate.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the position of the clamping plate can be adjusted by the cooperation of the sliding groove and the sliding column, so that the arc-shaped slots a and b on both sides of the middle of the clamping plate can better fit the shape of samples of different specifications. When clamping the sample, it can provide more uniform pressure, avoid the sample from sliding or being damaged due to improper clamping, improve the accuracy and reliability of the test, and at the same time, there is no need to replace the clamp.

[0023] 2. In this utility model, the connecting plate in the limiting component is fixed to the outside of the clamping plate. When the clamping plate is adjusted to a suitable position, the limiting component is inserted into the slot on the outside of the support frame under the action of spring b, locking the position of the clamping plate and preventing the clamping plate from shifting due to vibration and other factors during the fatigue test, thus ensuring the stability of the test. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the overall device in this utility model;

[0025] Figure 2 This is a three-dimensional structural diagram of the disassembled adjustment component in this utility model;

[0026] Figure 3 This is a three-dimensional structural diagram of the limiting component in this utility model.

[0027] Legend:

[0028] 1. Support frame; 2. Adjusting rod; 3. Clamping plate; 4. Adjusting assembly; 41. Sliding column; 42. Shim; 43. Spring a; 44. Slide groove; 45. Slot a; 46. Slot b; 5. Limiting assembly; 51. Connecting plate; 52. Limiting component; 53. Spring b; 54. Slot; 6. Pressing plate. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figures 1-3 This utility model provides an embodiment of a fatigue testing fixture suitable for multi-specification specimens, including a support frame 1, which serves as the basic frame of the fixture, bearing the installation and operation of all other components, and can be connected to fatigue testing equipment to perform fatigue testing on multi-specification specimens. An adjusting rod 2 is connected to the upper part of the support frame 1 via a threaded sleeve. The adjusting rod 2 is a threaded rod with a crossbar on it, facilitating rotation by the operator. Because the helix angle of the thread is less than the equivalent friction angle of the thread pair, the threaded transmission has self-locking properties, meaning that the adjusting rod 2 cannot be rotated by gravity or external force alone. A pressing plate 6 is rotatably connected to the lower part of the adjusting rod 2. The pressure plate 6 slides on the inner wall of the support frame 1, and the lower part of the extrusion plate 6 contacts the surface of the clamping plate 3. The clamping plate 3 is moved by the inner wall of the extrusion plate 6. Two sets of clamping plates 3 are symmetrically arranged on the inner side of the support frame 1. The surface of the clamping plate 3 is provided with grooves. The clamping plate 3 directly contacts the sample. By adjusting the spacing, samples of different widths can be clamped. At the same time, by adjusting the position of the clamping plate 3, it can better fit the shape of samples of different specifications, increase the contact area with the sample, and provide more uniform pressure when clamping the sample. It can prevent the sample from sliding or being damaged due to improper clamping, and improve the accuracy and reliability of the test. An adjustment mechanism is provided on the outer side of the support frame 1. The adjustment mechanism includes an adjustment component 4.

[0031] Reference Figures 1-3The adjusting assembly 4 includes a sliding column 41 that slides through and is slidably connected to the inner wall of the support frame 1 to restrict the clamping plate 3. A gasket 42 is fitted on the outer side of the sliding column 41, and the gasket 42 contacts the outer side of the clamping plate 3. Multiple sets of gaskets 42 are provided. A spring a43 is provided on the opposite side of two adjacent sets of gaskets 42. The elastic force of the spring a43 applies pressure to the gasket 42, causing the clamping plate 3 to reset. Simultaneously, it can limit the clamping plate 3 to a certain extent, preventing it from loosening. A slot b46 and a45 are respectively opened on both sides of the middle of the clamping plate 3. Both slot b46 and a45 are arc-shaped. The slots b46 and a45 have different dimensions and can be used to clamp samples with larger and smaller diameters, respectively. Slot a45 is a large arc shape, suitable for clamping samples with a diameter of 20-50mm; slot b46 is a small arc shape, suitable for samples with a diameter of 10-20mm, realizing "one clamp for multiple uses". When testing shaft parts of different diameters, the corresponding slot can be selected according to the sample size without changing the entire fixture. The outer side of the clamping plate 3 is symmetrically provided with sliding grooves 44. The sliding column 41 slides inside the sliding groove 44, and the clamping plate 3 can be moved through the sliding groove 44, so that the slot b46 or slot a45 can be moved to the middle of the support frame 1.

[0032] Reference Figures 1-3 The adjustment mechanism also includes a limiting component 5, which includes a connecting plate 51 fixedly connected to the outside of the clamping plate 3 for installing a limiting member 52. The connecting plate 51 slides on the outside of the support frame 1, and the limiting member 52 is slidably connected to the inner wall of the connecting plate 51, which can be inserted into the inner wall of the slot 54 to limit the clamping plate 3. The limiting member 52 and the connecting plate 51 are elastically connected by a spring b53. The spring b53 is used to provide elastic force to the limiting member 52, so that the limiting member 52 is kept inserted into the inner wall of the slot 54. The support frame 1 has a slot 54 on its outside, and the limiting member 52 is inserted into the slot 54. Multiple sets of slots 54 are provided. A pull ring is provided on the upper part of the limiting member 52 to facilitate the operator to pull the limiting member 52.

[0033] Working principle: When in use, according to the specifications of the sample, such as diameter and shape, pull the pull ring to make the limiting member 52 squeeze the spring b53 and disengage from the slot 54 to release the limiting of the clamping plate 3. At this time, the position of the clamping plate 3 can be adjusted so that the slot a45 or slot b46 on the clamping plate 3 moves to the middle of the support frame 1. When the clamping plate 3 is adjusted to the appropriate position, the connecting plate 51 moves with the clamping plate 3 to the target position. Release the pull ring, and the limiting member 52 automatically inserts into the slot 54 on the outside of the support frame 1 under the elastic force of the spring b53, rigidly locking the position of the clamping plate 3.

[0034] At this point, place the sample in the slots a45 or b46 on the middle and sides of the clamping plate 3. The large arc-shaped slot a45 is used to clamp samples with larger diameters, such as 20-50 mm, while the small arc-shaped slot b46 is used for samples with smaller diameters, such as 10-20 mm. The arc design ensures that the sample fits the surface of the sample and disperses the clamping force.

[0035] The operator rotates the crossbar on the adjusting rod 2, using the threaded sleeve drive to move the adjusting rod 2 downwards or upwards. The pressing plate 6 at the bottom of the adjusting rod 2 moves accordingly, pushing the clamping plate 3 to slide, changing the distance between the two sets of clamping plates 3 until the slot tightly fits the sample. The thread of the adjusting rod 2 engages with the threaded sleeve of the support frame 1, and the helix angle is less than the equivalent friction angle. After rotating to the position, it automatically locks to prevent the adjusting rod 2 from retracting due to external force.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fatigue testing fixture suitable for multi-specification specimens, comprising a support frame (1), characterized in that: The upper part of the support frame (1) is connected to an adjusting rod (2) by a threaded sleeve, and the lower part of the adjusting rod (2) is rotatably connected to a pressing plate (6). Two sets of clamping plates (3) are symmetrically arranged on the inner side of the support frame (1), and an adjusting mechanism is arranged on the outer side of the support frame (1). The adjusting mechanism includes an adjusting component (4). The adjustment assembly (4) includes a sliding column (41) that is slidably connected to the inner wall of the support frame (1). A pad (42) is sleeved on the outer side of the sliding column (41). Multiple sets of pads (42) are provided. A spring a (43) is provided on the opposite side of two adjacent sets of pads (42). A slot b (46) and a slot a (45) are respectively opened on both sides of the middle part of the clamping plate (3). A sliding groove (44) is symmetrically opened through the outer side of the clamping plate (3). The sliding column (41) slides inside the sliding groove (44).

2. The fatigue testing fixture suitable for multi-specification specimens according to claim 1, characterized in that: Both slot b (46) and slot a (45) are set to be arc-shaped.

3. A fatigue testing fixture suitable for multi-specification specimens according to claim 1, characterized in that: The gasket (42) contacts the outside of the clamp (3).

4. A fatigue testing fixture suitable for multi-specification specimens according to claim 1, characterized in that: The adjustment mechanism also includes a limiting component (5), which includes a connecting plate (51) fixedly connected to the outside of the clamp (3), the connecting plate (51) sliding on the outside of the support frame (1), and a limiting member (52) slidingly connected to the inner wall of the connecting plate (51), and the limiting member (52) and the connecting plate (51) elastically connected by a spring b (53).

5. A fatigue testing fixture suitable for multi-specification specimens according to claim 4, characterized in that: The support frame (1) has a slot (54) on its outer side, and the limiting member (52) is inserted into the slot (54).

6. A fatigue testing fixture suitable for multi-specification specimens according to claim 5, characterized in that: The slot (54) has multiple sets.

7. A fatigue testing fixture suitable for multi-specification specimens according to claim 4, characterized in that: The upper part of the limiting member (52) is provided with a pull ring.

8. A fatigue testing fixture suitable for multi-specification specimens according to claim 1, characterized in that: The extrusion plate (6) slides on the inner wall of the support frame (1), and the lower part of the extrusion plate (6) contacts the surface of the clamping plate (3).

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