Centering sample loading device for SHPB experiment

Abstract

The utility model provides a centering sample loader for an SHPB (split Hopkinson pressure bar) experiment, which relates to a centering structure and comprises an H-shaped plate and two semicircular plates. A semicircular plate with a downward opening is arranged above each side arm in the H-shaped plate; the two bottom ends of the semicircular plate are connected with the H-shaped plate through connecting columns correspondingly. A rectangular plate is arranged above a middle arm of the H-shaped plate; the rectangular plate is connected with the H-shaped plate through a guide driving structure A for driving the rectangular plate to move up and down; the semicircular plate, the H-shaped plate and the rectangular plate are symmetrical about a plane A; two clamping blocks are symmetrically arranged on the rectangular plate relative to the surface A; each clamping block is connected with the rectangular plate through a guide driving structure B which drives the clamping block to do linear reciprocating motion perpendicular to the surface A; according to the utility model, the centering efficiency can be effectively improved, and the defects existing during manual centering and sample clamping are avoided.

Description

Technical Field

[0001] The utility model relates to a centering structure, in particular to a SHPB experiment centering sample loader. Background Art

[0002] The SHPB experiment, or Split Hopkinson Pressure Bar experiment, is an experimental technique used to measure the stress-strain relationship of materials under dynamic impact loads.

[0003] This technology uses high-pressure gas to drive a bullet to hit the input rod, thereby generating an incident stress pulse in the input rod. When the incident wave propagates to the specimen, it pushes the specimen to begin to deform and generates a reflected stress pulse in the input rod. Another part of the pulse passes through the specimen into the transmission rod and propagates forward, which is called the transmitted wave. By recording the signals of the incident wave, reflected wave, and transmitted wave, the stress-strain relationship curve of the specimen can be obtained.

[0004] SHPB experiments are widely used in fields such as materials science, geological engineering, and civil engineering, and are particularly important in studying the dynamic mechanical properties of materials such as concrete and rock. For example, SHPB experiments can be used to study the mechanical response of materials under high-speed impact, which is crucial for understanding the behavior of materials under extreme conditions.

[0005] In the field of structural engineering, when using the SHPB test to measure the dynamic mechanical properties of concrete or rock specimens, it is necessary to load the sample between the reflection rod and the transmission rod of the SHPB equipment. For positive pressure samples, the sample, reflection rod and transmission rod are required to be coaxially distributed.

[0006] In the prior art, when positive pressure samples are loaded, they are mostly loaded manually. On the one hand, concrete samples are heavy, which leads to the disadvantage of large workload of manual loading. On the other hand, when loading samples manually, errors of eccentricity of samples, reflection rods and transmission rods are prone to occur, especially when the cross-sectional area of ​​the sample is smaller than the cross-sectional area of ​​the reflection rod and the transmission rod, which affects the accuracy of the experiment and has low loading efficiency. Utility Model Content

[0007] 1. Technical issues to be resolved

[0008] In view of the deficiencies of the prior art, the utility model provides a SHPB experiment centering sample loader to solve the technical problems existing in the manual sample loading in the prior art.

[0009] (II) Technical solution

[0010] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0011] The application provides a SHPB experiment centering sample loader, including an H-shaped plate and two semicircular plates;

[0012] Above each side arm of the H-shaped plate, there is a semi-circular plate with an opening facing downwards.

[0013] The two bottom ends of the semi-circular plate are respectively connected to the H-shaped plate through connecting columns.

[0014] Above the middle arm of the H-shaped plate, there is a rectangular plate.

[0015] The rectangular plate is connected to the H-shaped plate through a guiding drive structure A that drives its up and down movement.

[0016] The semi-circular plate, the H-shaped plate, and the rectangular plate are all symmetrical structures with respect to plane A.

[0017] On the rectangular plate, two clamping blocks are symmetrically arranged with respect to plane A.

[0018] Each of the clamping blocks is connected to the rectangular plate through a guiding drive structure B that drives its linear reciprocating movement perpendicular to plane A.

[0019] Furthermore, the guiding drive structure A includes a stud A, a handle A, and two guiding columns.

[0020] The top ends of the two guiding columns are respectively fixedly connected to the bottom of the rectangular plate, and the bottom ends penetrate through the H-shaped plate and are located below the H-shaped plate.

[0021] The stud A is arranged between the two guiding columns, is threadedly connected to the H-shaped plate, and its top end and bottom end are respectively located on the upper and lower sides of the H-shaped plate.

[0022] A handle A is installed at the bottom end of the stud A, and its top is in contact with the bottom of the rectangular plate.

[0023] The axes of the stud A and the two guiding columns are all located in plane A.

[0024] Furthermore, at the bottom of the rectangular plate, there is a groove group composed of two connecting grooves and a driving groove.

[0025] The top end of each guiding column is threadedly connected to the corresponding connecting groove.

[0026] The top end of the stud A is located in the driving groove.

[0027] Furthermore, at the top of the rectangular plate, there is also a groove group, and the two groove groups are symmetrically arranged with respect to the rectangular plate.

[0028] Furthermore, on both sides of the rectangular plate, there are centering diamond-shaped blocks.

[0029] The top tip of the diamond-shaped block is coplanar with the top of the rectangular plate and is located in plane A.

[0030] The bottom tip of the diamond-shaped block is coplanar with the bottom of the rectangular plate and is located in plane A.

[0031] Further, a scale is rotatably connected to the middle of the side wall of the rectangular plate; a guiding hole for the scale to pass through is formed on the H-shaped plate, and the bottom end of the scale passes through the guiding hole and is arranged below the H-shaped plate.

[0032] Further, a reading indication structure is installed on the H-shaped plate.

[0033] Further, the guiding drive structure B includes two guiding grooves, two guiding blocks, a stud B, a displacement groove, a driving block and a handle B;

[0034] Within the same guiding drive structure B:

[0035] The two guiding grooves are parallel to each other and perpendicular to plane A, and are both formed on the rectangular plate;

[0036] Each guiding groove is provided with a guiding block;

[0037] The top of each guiding block is fixedly connected to the corresponding clamping block;

[0038] The displacement groove is arranged between the two guiding grooves and is formed on the rectangular plate;

[0039] The displacement groove is provided with a driving block;

[0040] The top of the driving block is fixedly connected to the corresponding clamping block;

[0041] The side wall of the driving block facing away from the corresponding clamping block is in contact with the first end of the stud B arranged in the displacement groove;

[0042] The second end of the stud B penetrates through the displacement groove and is connected to a handle B arranged outside the rectangular plate, and the stud B is in threaded connection with the rectangular plate.

[0043] (III) Beneficial effects

[0044] A SHPB experiment centering sample loader provided by the present utility model has the following beneficial effects compared with the prior art:

[0045] By arranging a semi-circular plate, a connecting column, an H-shaped plate, etc., the rapid centering of a cylindrical specimen and a rod can be realized, avoiding the disadvantages during manual centering and clamping, improving the centering efficiency and accuracy, and facilitating ensuring the accuracy of experimental results. Description of the drawings

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0047] Figure 1 Schematic diagram of the structure of a SHPB experiment centering sample loader in a first state provided by the embodiment;

[0048] Figure 2 For Figure 1 Local enlarged view at A in

[0049] Figure 3 Schematic diagram of the structure of a SHPB experiment centering sample loader in a second state provided by the embodiment.

[0050] In the figure: 1. H-shaped plate, 2. Semi-circular plate, 3. Connecting column, 4. Rectangular plate, 5. Clamping block, 6. Stud A, 7. Handle A, 8. Guide post, 9. Connecting groove, 10. Driving groove, 11. Rhombic block, 12. Scale, 13. Indication structure, 14. Guide groove, 15. Stud B, 16. Displacement groove, 17. Handle B. Detailed implementation manners

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0052] To solve the problems of large workload and poor centering effect when manually centering the specimen during the SHPB experiment, the present application provides a SHPB experiment centering sample loader to solve the problems existing in the prior art.

[0053] To facilitate a clear understanding of the solution of the present application, the technical solutions of the present application will be introduced in detail below in combination with specific embodiments.

[0054] Embodiment

[0055] Combined with the attached Figures 1-3, this embodiment provides a SHPB experiment centering sample loader, which includes a semi-circular plate 2 for hanging on the ends of two rods. The semi-circular plate 2 has an opening facing downwards and is hung on the corresponding rods. The inner diameter of the semi-circular plate 2 is the same as the outer diameter of the rods. When hanging, a lubricating layer can be coated on the inner walls of the two to facilitate later clamping.

[0056] It also includes a horizontally arranged H-shaped plate 1. Above each side arm of the H-shaped plate 1, there is a semi-circular plate 2. The bottom ends of each semi-circular plate 2 are respectively connected to the corresponding side arm of the H-shaped plate 1 through a connecting column 3. As shown in the figure, the connection positions are symmetrically arranged, thus ensuring the convenience of later clamping.

[0057] The connection length between the connecting column 3 and the H-shaped plate 1 can also be set to an adjustable and detachable relationship, so that the length of the connecting column 3 between the semi-circular plate 2 and the H-shaped plate 1 can be adjusted when needed, thereby performing corresponding specimen installation and facilitating later disassembly.

[0058] To support the specimen, a rectangular plate 4 is provided above the middle arm of the H-shaped plate 1, and the rectangular plate 4 is connected to the H-shaped plate 1 through a guiding drive structure A that drives it to move up and down.

[0059] That is to say, the rectangular plate 4 can effectively rise and fall, so as to meet the clamping requirements of specimens of different sizes.

[0060] In this embodiment, the guiding drive structure A includes a stud A6, a handle A7, and two guiding columns 8.

[0061] Among them, the top ends of the two guiding columns 8 are respectively fixedly connected to the bottom of the rectangular plate 4, and the bottom ends penetrate through the H-shaped plate 1 and are arranged below the H-shaped plate 1 for guiding and limiting the H-shaped plate 1.

[0062] The stud A6 is arranged between the two guiding columns 8 and is threadedly connected to the H-shaped plate 1. Its top end and bottom end are respectively arranged on the upper and lower sides of the H-shaped plate 1, and a handle A7 is installed at the bottom end of the stud A6, and its top is in contact with the bottom of the rectangular plate 4.

[0063] That is to say, by screwing the handle A7, the stud A6 can be driven to rotate, so that the rectangular plate 4 rises or falls, thereby adjusting the height of the rectangular plate 4 and further adjusting the position of the specimen on it.

[0064] To reduce the adjustment difficulty of the equipment, the semi-circular plate 2, the H-shaped plate 1, and the rectangular plate 4 are all symmetric structures with respect to plane A.

[0065] Refer to Appendix Figure 1 and 3 , plane A is a vertical plane, and the axes of the two rods are in plane A. Thus, the midline of the rectangular plate 4 in the extending direction of the rods is the vertical plane where the rod axis is located, which is convenient for centering the specimen according to this.

[0066] In order to facilitate the clamping of the specimen coaxially distributed with the rod, two clamping blocks 5 are symmetrically arranged on the rectangular plate 4 with respect to the plane A, and each clamping block 5 is connected to the rectangular plate 4 through a guiding and driving structure B that drives it to linearly reciprocate perpendicular to the plane A.

[0067] That is, each wire driving structure B drives the corresponding clamping block 5 to clamp the specimen between them, making the vertical plane where the center line of the specimen lies coplanar with the plane A. Then, after adjusting the position of the specimen up and down by driving the guiding and driving structure B, the centering of the specimen can be achieved.

[0068] In this embodiment, the guiding and driving structure B includes two guiding grooves 14, two guiding blocks, a stud B15, a displacement groove 16, a driving block, and a handle B17. Among them, within the same guiding and driving structure B: the two guiding grooves 14 are parallel to each other and perpendicular to the plane A, and are both opened on the rectangular plate 4. And a guiding block is arranged in each guiding groove 14, and the top of each guiding block is fixedly connected to the corresponding clamping block 5.

[0069] Thus, the corresponding clamping block 5 can be guided and limited.

[0070] The displacement groove 16 is arranged between the two guiding grooves 14 and is parallel to them, and is opened on the rectangular plate 4. And a driving block is arranged in the displacement groove 16, and at the same time, the top of the driving block is fixedly connected to the corresponding clamping block 5.

[0071] The side wall of the driving block facing away from the corresponding clamping block 5 is attached to the first end of the stud B15 arranged in the displacement groove 16, and the second end of the stud B15 penetrates through the displacement groove 16 and is connected to the handle B17 arranged outside the rectangular plate 4, and the stud B15 is threadedly connected to the rectangular plate 4.

[0072] That is, by rotating the handle B17, the stud B15 can be driven to rotate, so that the corresponding clamping block 5 clamps the specimen or releases the specimen.

[0073] The working principle of the above device is as follows:

[0074] Place the cylindrical specimen on the rectangular plate 4. At this time, the axis of the specimen is horizontal, and the center line of the specimen has been drawn by a marker pen in advance, that is, a rectangle is drawn on the outer wall of the specimen, and the axis of the specimen is coplanar with the plane where the rectangle is located.

[0075] Then, by rotating the handle B17, the corresponding clamping block 5 is used to adjust the position of the specimen on the rectangular plate 4, so that the plane where the rectangle is located is coplanar with the plane A and is clamped and limited by the two clamping blocks 5. Then, by rotating the handle B17, the position of the rectangular plate 4 is adjusted to make the axis of the specimen collinear with the axis of the rod. After that, drive the two rods to clamp the specimen. After the clamping is completed, screw the connecting column 3 to separate the two semi-circular plates 2 from the H-shaped plate 1, complete the disassembly of the device, and then the SHPB experiment can be carried out.

[0076] In some embodiments, in order to facilitate the disassembly and assembly of the rectangular plate 4 and avoid the influence of the guide posts 8 and the like on the clamping of the specimen, a groove group composed of two connecting grooves 9 and a driving groove 10 is also provided at the bottom of the rectangular plate 4. The top end of each guide post 8 is threadedly connected to the corresponding connecting groove 9, and the top end of the stud A6 is arranged in the driving groove 10.

[0077] That is, the driving groove 10 helps to quickly position the guide post 8 and can limit it, while the connecting groove 9 can quickly realize the quick connection between the guide post 8 and the rectangular plate 4.

[0078] In some embodiments, such as Figure 3 , in order to be able to perform an experiment in which the axis of the specimen is perpendicular to the axis of the rod and is bisected by the axis of the rod, a groove group is also provided at the top of the rectangular plate 4. The two groove groups are symmetrically arranged with respect to the rectangular plate 4.

[0079] That is, when the rectangular plate 4 is turned over so that its top is facing up, the plane at the bottom of the rectangular plate 4 can be used to support the specimen with its axis vertically arranged, and the setting of the two groove groups will not cause the connection relationship between the guide post 8 and the like and the rectangular plate 4 to affect the centering of the specimen.

[0080] When performing such a clamping operation, first make the rectangle drawn on the specimen coincide with the surface A, and then adjust the height through the wire driving structure A until the axis of the specimen is bisected by the axis of the rod (at this time, the rectangle drawn on the specimen is coplanar with the surface A), and then perform the clamping and disassembly of the equipment.

[0081] In some embodiments, in order to quickly make the rectangle drawn on the specimen coplanar with the surface A, centering diamond blocks 11 are also provided on both side portions of the rectangular plate 4; wherein, the top tip of the diamond block 11 is coplanar with the top of the rectangular plate 4 and is arranged in the surface A, and the bottom tip of the diamond block 11 is coplanar with the bottom of the rectangular plate 4 and is arranged in the surface A.

[0082] That is, when the tops of the two diamond blocks 11 are both in contact with and coplanar with the rectangle drawn on the specimen, the position placement of the specimen can be quickly completed, thereby improving the specimen clamping efficiency.

[0083] In some embodiments, in order to facilitate the quick centering of the specimen, a scale 12 is also rotatably connected to the middle of the side wall of the rectangular plate 4; a guiding hole for the scale 12 to pass through is provided on the H-shaped plate 1, and the bottom end of the scale 12 passes through the guiding hole and is arranged below the H-shaped plate 1.

[0084] Combined with the attached Figure 1 , the top end of the scale 12 is rotatably connected to the side wall of the adjacent diamond block 11, so that when the rectangular plate 4 is turned over, the position of the scale 12 will not change and the height will also remain the same, thereby improving the accuracy of later readings.

[0085] For the convenience of reading the scale 12, a reading indication structure 13 is also installed on the H-shaped plate 1.

[0086] Thus, the upward height or downward height of the specimen can be quickly obtained, and then quick centering can be achieved.

[0087] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A SHPB experiment centering sample loader, characterized in that: It includes an H-shaped plate and two semicircular plates; A semicircular plate with an opening facing downward is provided above each side arm of the H-shaped plate; The two bottom ends of the semicircular plate are respectively connected to the H-shaped plate through connecting columns; A rectangular plate is provided above the middle arm of the H-shaped plate; The rectangular plate is connected to the H-shaped plate through a guide drive structure A that drives it up and down; The semicircular plate, H-shaped plate and rectangular plate are all symmetrical structures about surface A; Two clamping blocks are symmetrically arranged on the rectangular plate about surface A; Each of the clamping blocks is connected to the rectangular plate via a guide driving structure B that drives it to perform linear reciprocating motion perpendicular to the surface A.

2. A SHPB experiment centering sample loader according to claim 1, characterized in that: The guide drive structure A comprises a stud A, a handle A and two guide posts; The top ends of the two guide posts are respectively fixedly connected to the bottom of the rectangular plate, while the bottom ends penetrate the H-shaped plate and are arranged below the H-shaped plate; The stud A is arranged between the two guide pillars and is threadedly connected to the H-shaped plate, and its top end and bottom end are respectively arranged on the upper and lower sides of the H-shaped plate; A handle A is installed at the bottom end of the stud A, and the top of the handle A fits the bottom of the rectangular plate; The axes of the stud A and the two guide posts are all arranged in the plane A.

3. A SHPB experiment centering sample loader according to claim 2, characterized in that: The bottom of the rectangular plate is provided with a groove group consisting of two connecting grooves and one driving groove; The top end of each guide post is threadedly connected to the corresponding connection groove; The top end of the stud A is arranged in the driving groove.

4. A SHPB experiment centering sample loader according to claim 3, characterized in that: A groove group is also formed on the top of the rectangular plate, and the two groove groups are symmetrically arranged with respect to the rectangular plate.

5. The SHPB experiment centering sample loader according to claim 1, characterized in that: Both sides of the rectangular plate are provided with diamond blocks for centering; The top tip of the rhombus block is coplanar with the top of the rectangular plate and is arranged in plane A; The bottom tip of the rhombus block is coplanar with the bottom of the rectangular plate and is arranged in plane A.

6. A SHPB experiment centering sample loader according to claim 1, characterized in that: A ruler is also rotatably connected to the middle of the side wall of the rectangular plate; a guide hole for the ruler to pass through is opened on the H-shaped plate, and the bottom end of the ruler passes through the guide hole and is arranged below the H-shaped plate.

7. A SHPB experiment centering sample loader according to claim 6, characterized in that: A reading indicating structure is installed on the H-shaped plate.

8. The SHPB experiment centering sample loader according to claim 1, characterized in that: The guide drive structure B comprises two guide grooves, two guide blocks, a stud B, a displacement groove, a drive block and a handle B; In the same guide drive structure B: The two guide grooves are parallel to each other and perpendicular to the surface A, and are both opened on the rectangular plate; A guide block is provided in each guide groove; The top of each guide block is fixedly connected to the corresponding clamping block; The displacement groove is arranged between the two guide grooves and is opened on the rectangular plate; A driving block is provided in the displacement slot; The top of the driving block is fixedly connected to the corresponding clamping block; The driving block is away from the side wall of the corresponding clamping block and is in contact with the first end of the stud B provided in the displacement groove; The second end of the stud B passes through the displacement slot and is connected to a handle B arranged outside the rectangular plate, and the stud B is threadedly connected to the rectangular plate.

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