A hopkinson pressure bar guard

Abstract

This utility model relates to the technical field of mechanical property testing devices, and more particularly to a Hopkinson bar protection device. It includes an incident rod and a transmission rod horizontally mounted on a base. A protective cover is fitted over the opposite ends of the incident rod and transmission rod. The protective cover is horizontally movable and tilted. A guide plate is provided at the lower end of the protective cover, and a debris collection bag is fitted onto the guide plate. In use, the protective cover is first moved to one side. After the sample is clamped by the incident rod and transmission rod, the protective cover is moved to the sample position and covers the sample. The radial circumference of the sample fragments is contained by the protective cover, thus preventing sample fragments from flying and facilitating debris collection and cleaning. Furthermore, the protective cover is movable and does not affect the clamping and placement of the sample.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical property testing devices, and in particular to a Hopkinson bar protection device. Background Technology

[0002] The Hopkinson bar test is one of the core methods for testing the dynamic mechanical properties of materials. The specimen (usually a cylinder) is clamped between the end faces of an incident bar and a transmission bar. A projectile is fired, impacting the incident bar and generating an elastic stress pulse (incident wave). This pulse propagates along the incident bar to the specimen cross-section. Part of the stress wave is reflected back to the incident bar (reflected wave), and part of the stress wave passes through the specimen and is transmitted to the transmission bar (transmitted wave). Strain gauges attached to the incident and transmission bars record the time history signals of the incident, reflected, and transmitted waves, respectively.

[0003] Despite the maturity and widespread application of SHPB technology, it still faces some significant drawbacks in practical operation, namely the risk of specimen fragmentation. This is the most prominent safety hazard when conducting dynamic compression tests on brittle materials (such as ceramics, rocks, concrete, certain intermetallic compounds, and high-strength alloys) or tough materials that have reached their failure limits. Under high strain rate loads, specimens often undergo severe brittle fracture or pulverization. The high-speed fragments generated by the fracture can violently scatter in all directions from the narrow gap between the incident and transmission rods. The scattering fragments pose a serious risk of personal injury and equipment damage to experimental personnel and nearby equipment. Moreover, the fragments scattered on the test bench, rod surfaces, and even inside precision instruments are time-consuming and labor-intensive to clean up, affecting experimental efficiency.

[0004] Therefore, this utility model provides a Hopkinson bar protection device to reduce the safety hazards caused by sample breakage and splashing, and improve experimental safety. Utility Model Content

[0005] The purpose of this invention is to solve the problems existing in the prior art by proposing a Hopkinson's bar protection device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A Hopkinson's bar protection device includes an incident bar and a transmission bar horizontally arranged on a base. The incident bar and the transmission bar are covered with a protective cover at opposite ends. The protective cover is horizontally movable and is inclined. A guide plate is provided at the lower end of the protective cover, and a debris collection bag is fitted on the guide plate.

[0008] Preferably, the guide plate has a 7-shaped structure, and the scrap collection bag is fitted onto the vertical part of the guide plate.

[0009] Preferably, the vertical part of the guide plate is provided with a support ring to expand the opening of the scrap collection bag.

[0010] Preferably, the scrap collection bag is attached to the support ring by Velcro.

[0011] Preferably, the lower end of the protective cover is provided with two sets of supports spaced apart, and each set of supports has a slider on both sides of its lower end. The sliders on the same side of the two sets of supports are slidably connected to a slide rail that is horizontally placed on the base.

[0012] Preferably, the protective cover is further provided with a ring cutter, and the ring cutter is provided with a handle extending from the upturned end of the protective cover.

[0013] Preferably, the ring cutter has a double-layer ring frame on the side facing the raised end of the protective cover.

[0014] Compared with the prior art, this utility model provides a Hopkinson's stress bar protection device, which has the following beneficial effects:

[0015] 1. In use, the protective cover is first moved aside. After the sample is clamped by the incident rod and the transmission rod, the protective cover is moved to the sample position and placed over the sample. The radial circumference of the sample fragments is covered by the protective cover, which can prevent the sample fragments from flying and facilitate the collection and cleaning of the debris. Moreover, the protective cover is movable and does not affect the clamping and placement of the sample.

[0016] 2. When using this utility model, the handle is held and the ring frame is pushed. The ring blade moves inside the protective cover, thereby scraping off the debris stuck to the inner wall of the protective cover and guiding the debris to fall into the debris collection bag for easy collection of residue.

[0017] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the left side of this utility model.

[0019] Figure 2 This is a three-dimensional axial view of the right side of this utility model.

[0020] Figure 3 This is a front view schematic diagram of the present invention.

[0021] Figure 4 This is a frontal cross-sectional view of the present invention.

[0022] Figure 5 This is a schematic diagram of the assembly of the ring cutter, ring holder, and shank of this utility model.

[0023] In the diagram: 1. Slide rail; 2. Support; 3. Protective cover; 4. Incident rod; 5. Transmission rod; 6. Guide plate; 7. Support ring; 8. Scrap collection bag; 9. Velcro; 10. Ring frame; 11. Ring cutter; 12. Handle rod. Detailed Implementation

[0024] The following will refer to the appendix in the embodiments of this utility model. Figure 1-5 The technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0025] Example 1: To address the problems existing in the prior art, this embodiment provides a Hopkinson's pressure bar protection device, including an incident rod 4 and a transmission rod 5 horizontally arranged on a base. The base is provided with multiple sets of supports corresponding to the incident rod 4 and the transmission rod 5, which horizontally support the incident rod 4 and the transmission rod and provide horizontal guidance (not shown in the attached figures). The above are the basic components for realizing the Hopkinson's pressure bar experimental device; however, other basic components may be used, including but not limited to these, to complete the experiment.

[0026] To prevent the sample from shattering and scattering, this design includes two symmetrically arranged, parallel slide rails 1 on the base, secured to the base with screws. Two sets of supports 2 are spaced apart on the two slide rails 1, with sliders bolted to the bottom of each support 2. A protective cover 3 is fixedly mounted on the upper end of both supports 2. The cooperation between the sliders and the slide rails 1 allows the protective cover 3 to slide along the incident rod 4.

[0027] Based on the above technical solution:

[0028] In use, first move the protective cover 3 aside. After the sample is clamped by the incident rod 4 and the transmission rod 5, move the protective cover 3 to the sample position and cover the sample. The radial circumference of the sample fragments is covered by the protective cover 3, which can prevent the sample fragments from flying and facilitate the collection and cleaning of debris. Moreover, the protective cover 3 is movable and does not affect the clamping and placement of the sample.

[0029] In this embodiment, the protective cover 3 is tilted so that the sample fragments slide down and are easy to collect.

[0030] In this embodiment, a guide plate 6 is provided at the lower end of the protective cover 3. The guide plate 6 has a symmetrical "7"-shaped structure. A support ring 7 is provided at the vertical part of the guide plate 6, and a debris collection bag 8 is fitted on the support ring 7. The support ring 7 opens the opening of the debris collection bag 8. In this way, the broken debris slides down inside the protective cover 3 and falls into the debris collection bag 8 along the guide plate 6, making cleaning more convenient.

[0031] In this embodiment, the inner ring of the opening of the scrap collection bag 8 is provided with a Velcro 9 rough surface, and the outer edge of the support ring 7 is provided with a Velcro 9 hook surface. By sticking the Velcro 9 rough surface and the hook surface together, the scrap collection bag 8 is fitted onto the support ring 7.

[0032] In this embodiment, the opening of the scrap collection bag 8 can be directly tied to the outer edge of the support ring 7 with a cable tie.

[0033] In this embodiment, the opening of the scrap collection bag 8 can be fitted with a rubber rope and a tightening spring, thereby clamping it to the outer edge of the support ring 7.

[0034] In Example 2, a further embodiment of this solution, after the sample breaks apart, it remains inside the protective cover 3. To facilitate the removal of the fragments into the debris collection bag 8, a double-layer ring frame 10 is also embedded inside the protective cover 3. The double-layer ring frame 10 includes two discs connected by a sleeve, the diameter of which allows the incident rod 4 and the transmission rod 5 to pass through unimpeded. The discs are embedded inside the protective cover 3, with their outer edges abutting against the inner wall of the protective cover 3. Friction damping is provided at the contact surface between the ring frame 10 and the inner wall of the protective cover 3 to prevent easy slippage. A handle 12 is provided on the disc end face away from the debris collection bag 8 for external pushing; a ring cutter 11 is provided on the disc end face facing the debris collection bag 8 to scrape away the debris adhering to the inner wall of the protective cover 3.

[0035] Based on the above technical solution:

[0036] When in use, hold the handle 12 to push the ring frame 10, and the ring cutter 11 moves inside the protective cover 3, thereby scraping off the debris stuck to the inner wall of the protective cover 3 and guiding the debris to fall into the debris collection bag 8 for easy collection of residue.

[0037] In this embodiment, the ring cutter 11 can also be a ring-shaped brush with bristles pressed against the inner wall of the protective cover 3.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A Hopkinson's pressure bar protection device, comprising an incident rod (4) and a transmission rod (5) horizontally arranged on a base, characterized in that, The incident rod (4) and the transmission rod (5) are covered by a protective cover (3) at opposite ends. The protective cover (3) can move horizontally and is set at an angle. A guide plate (6) is provided at the lower end of the protective cover (3), and a scrap collection bag (8) is fitted on the guide plate (6).

2. The Hopkinson's stroke protection device according to claim 1, characterized in that, The guide plate (6) has a 7-shaped structure, and the scrap collection bag (8) is fitted on the vertical part of the guide plate (6).

3. The Hopkinson's stroke protection device according to claim 2, characterized in that, The vertical part of the guide plate (6) is provided with a support ring (7) for the opening of the scrap collection bag (8).

4. The Hopkinson's stroke protection device according to claim 3, characterized in that, The scrap collection bag (8) is attached to the support ring (7) by Velcro (9).

5. The Hopkinson's stroke protection device according to claim 1, characterized in that, The lower end of the protective cover (3) is provided with two sets of supports (2) spaced apart. Both sides of the lower end of the two sets of supports (2) are provided with sliders. The sliders on the same side of the two sets of supports (2) are slidably connected to a slide rail (1) that is horizontally placed on the base.

6. The Hopkinson's stroke protection device according to claim 1, characterized in that, The protective cover (3) is also provided with a ring cutter (11), and the ring cutter (11) is provided with a handle (12) extending from the upturned end of the protective cover (3).

7. The Hopkinson's stroke protection device according to claim 6, characterized in that, The ring cutter (11) has a double-layer ring frame (10) on the side facing the raised end of the protective cover (3).

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