A split hopkinson bar layering experiment concrete specimen preparation device and a use method thereof

Abstract

This invention belongs to the field of spallation testing, and relates to a concrete specimen preparation device and its usage method for the Hopkinson bar spallation test. The concrete specimen preparation device comprises an upper and lower cavities forming a container for holding the concrete specimen. The upper and lower cavities rotate horizontally. The vibration mechanism includes a vibratory pump that moves vertically and horizontally. Fan-shaped deflecting wheels are rotatably mounted on both sides of the vibratory pump. A slide rail is installed at the lower end of the vibratory pump, and a slider is slidably mounted in the slide rail. A fixed cover is installed below the slider via a universal joint shaft, and the fixed cover is located above the upper cavities. The method of using the concrete specimen preparation device involves injecting concrete and starting the vibratory pump. The vibratory pump drives the deflecting wheels to generate multi-directional centrifugal force, causing the vibratory pump to vibrate horizontally and vertically. This vibration is transmitted to the upper and lower cavities through the fixed cover to vibrate the concrete. This invention achieves multi-directional composite vibration, resulting in a uniform distribution of vibration energy circumferentially across the concrete specimen.

Description

Technical Field

[0001] This invention belongs to the field of Hopkinson bar delamination test technology, specifically relating to a device for preparing concrete specimens for the Hopkinson bar delamination test and its usage method. Background Technology

[0002] In the study of the dynamic mechanical behavior of materials under explosive impact loads, the Hopkinson bar delamination test is a core testing method for evaluating the tensile properties of brittle materials such as concrete. Because the compressive strength and tensile strength of concrete differ by orders of magnitude (tensile strength is only 5%-10% of compressive strength), the tensile wave reflection effect generated during shock wave propagation easily induces delamination failure in concrete. This characteristic makes the internal density of the concrete specimen a key factor affecting the reliability of experimental data.

[0003] In the existing technology, the preparation of Hopkinson bar layer crack specimens faces the following technical bottlenecks: (1) Large-sized concrete specimens (conventional length ≥ 500 mm) have significant gravity effects, and traditional vibration tables are difficult to achieve circumferential uniform energy transfer, resulting in a porosity dispersion of up to 15%-20% inside the concrete specimens; (2) The lack of coordinated control of rotational vibration makes it impossible to simultaneously eliminate the phenomenon of directional aggregation of air bubbles inside the concrete specimens. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a device and method for preparing concrete specimens for the Hopkinson bar delamination test. The technical solution adopted by this invention is as follows: A Hopkinson bar delamination test concrete specimen preparation device includes an upper receiving cavity, a lower receiving cavity, and a vibration mechanism. The upper and lower receiving cavities are fixedly connected to form a container for containing the concrete specimen. The upper and lower receiving cavities are capable of horizontal rotation. The vibration mechanism includes a vibration pump capable of moving up, down, left, and right. Fan-shaped deflecting wheels are rotatably installed on the front and rear sides of the vibration pump. A vertical slide rail is installed at the lower end of the vibration pump. A slider is slidably installed in the slide rail. A fixing cover is installed below the slider via a universal joint shaft. The fixing cover is located above the upper receiving cavity. A first positioning screw is threadedly connected to one side of the slide rail.

[0005] Preferably, the upper receiving cavity includes three upper receiving plates, and the lower receiving cavity includes three lower receiving plates. Both the upper and lower receiving plates are arc-shaped plates with a 120° arc. The first motor is located below the vibrating pump. Several fourth support columns are evenly distributed around the outer periphery of the first motor. A connecting block is fixedly installed at the upper end of the fourth support column. A transmission cylinder is rotatably installed inside the connecting block. A threaded rotating rod is rotatably installed inside the transmission cylinder. The lower end of the threaded rotating rod is connected to the output shaft of the first motor. A conveyor belt is embedded in the lower part of the transmission cylinder. The conveyor belt is connected to the output shaft of the second motor. A first connecting ring is fixedly installed around the outer periphery of the transmission cylinder. The first connecting ring is hinged to one end of three first transmission rods, which are equidistantly distributed along the circumference of the first connecting ring. The other end of the first transmission rod is hinged to a third transmission rod. A second sliding groove is opened at the lower part of the third transmission rod. The upper part of the threaded rotating rod is screwed to the second connecting ring. The upper ends of the three second transmission rods are hinged to the outer circumference of the second connecting ring. The lower end of the second transmission rod slides in cooperation with the second sliding groove of the third transmission rod. A connecting tray is fixedly installed at the upper end of the third transmission rod. A third spring is fixedly installed above the connecting tray. A lower receiving plate is fixedly installed at the upper end of the third spring. The upper receiving plate is fixedly installed above the lower receiving plate through a flange.

[0006] Preferably, the upper end of the first support column is rotatably connected to the second support column via a first rotating shaft. A horizontal first fixing plate is fixedly installed above the second support column. A cylinder is fixedly installed on the outer end of the upper surface of the first fixing plate. The piston rod of the cylinder is fixedly connected to one end of the first connecting rod. The other end of the first connecting rod is hinged to one end of the second connecting rod and one end of the third connecting rod, respectively. The other ends of the second connecting rod and the third connecting rod are hinged to one end of the first slider base and one end of the second slider base, respectively. The adjacent sides of the first slider base and the second slider base are integrally formed with symmetrically arranged protruding plates. The outer end of the protruding plate is opened with a circular hole. A fixing shaft is fixedly installed on the first fixing plate at the position corresponding to the circular hole of the protruding plate. The fixing shaft passes through the circular hole of the protruding plate. A first sliding groove is provided on the upper part of the first slider base and the second slider base. A first clamp and a second clamp are slidably installed in the first sliding groove. The front ends of the first clamp and the second clamp are symmetrically opened with semi-circular grooves, which are adapted to the outer diameter of the concrete specimen.

[0007] Preferably, a rope buckle is fixedly installed on the outer periphery of the lower receiving plate, and a pair of second fixing buckles are symmetrically fixed on the outer side of the rope buckle and the upper surface of the connecting tray, with a second fixing rod inserted into the second fixing buckle.

[0008] Preferably, the fourth support column is inverted L-shaped.

[0009] Preferably, symmetrically arranged first fixing buckles are fixedly installed on one side of the upper end of the first support column and the lower end of the second support column, and a first fixing rod is inserted into a pair of first fixing buckles.

[0010] Preferably, horizontal threaded holes are symmetrically opened at the other end of the first slider base and the other end of the second slider base, and the second positioning screw is screwed into the threaded holes.

[0011] Preferably, a second horizontal fixing plate is fixedly installed at the upper end of the third support column, and two vertical connecting plates are symmetrically fixedly installed below the second fixing plate. A concave frame is movably arranged between the two connecting plates, with the opening of the concave frame facing downward. The two connecting plates are connected to the concave frame via a first horizontal sliding shaft. A first spring is fitted around the outer periphery of the first sliding shaft between the connecting plate and the concave frame. A vibration pump is fixedly installed in the concave frame, and a second vertical sliding shaft is fixedly installed in the concave frame. The vibration pump is slidably connected to the second sliding shaft, and a second spring is fitted on the second sliding shaft between the vibration pump and the concave frame.

[0012] The aforementioned method for using a concrete specimen preparation device for the Hopkinson bar delamination test includes the following steps: First, fix the upper receiving plate above the lower receiving plate using the flange. Then, inject concrete into the upper receiving plate. After the concrete is injected, move the fixing cover down until the fixing cover contacts the upper end of the upper receiving plate. When the vibratory pump is started, it drives the deflector wheels on both sides to generate multi-directional centrifugal force. The vibratory pump moves left and right and up and down, and the vibration is generated through the displacement. The vibration is transmitted to the upper and lower receiving cavities through the fixed cover to vibrate the concrete. Simultaneously start the vibratory pump and run the first and second motors. Control the rotation of the upper and lower receiving plates via the first, second, and third transmission rods to ensure that the vibration energy is evenly distributed around the circumference of the concrete specimen. After vibration is complete, turn off the vibratory pump, the first motor, and the second motor. After the concrete has solidified, lift the fixing cover upwards until it is far away from the upper end of the upper receiving plate. Remove the flange and take off the upper receiving plate. Adjust the extension length of the first and second clamps to the corresponding positions. Start the cylinder to retract the piston rod, clamp the upper part of the concrete specimen with the first and second clamps, start the first motor and lock the second motor, control the rotation of the threaded rod to move the second connecting ring downwards, and drive the lower end of the third transmission rod to move outwards to separate the lower receiving plate.

[0013] Preferably, the initial state of the preparation device is that the three upper receiving plates and the three lower receiving plates are in a combined state, and the inner surfaces of the upper and lower receiving plates are coated with concrete release agent.

[0014] The beneficial effects of this invention are: 1. The present invention is equipped with a deflection wheel, which can be driven to rotate by a vibration pump to generate multi-directional centrifugal force. Combined with the elastic reset effect of the spring, it can realize multi-directional composite vibration of the sealed container, eliminating the phenomenon of directional aggregation of concrete air bubbles caused by traditional unidirectional vibration. 2. The present invention provides a horizontally rotatable container for holding concrete specimens, which can control the rotation of the concrete specimens during vibration in a closed container, thereby achieving a uniform distribution of vibration energy around the circumference of the concrete specimens. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the preparation apparatus according to an embodiment of the present invention; Figure 2 for Figure 1 Front view of the vibration mechanism in the image; Figure 3 for Figure 2 The left view; Figure 4 for Figure 3 A cross-sectional view of the slide rail section; Figure 5 for Figure 1 A schematic diagram of the structure of the first and second clamps in the image; Figure 6 for Figure 1 A schematic diagram of the dual-motor synchronous drive mechanism in the diagram; Figure 7 for Figure 6 A magnified view of a section at point A in the middle; Figure 8 for Figure 1 Front view of the first and second support columns in the structure; Figure 9 for Figure 6 Full sectional view of the threaded rotor section in the image; Figure 10 for Figure 6 A schematic diagram of the upper and lower receiving plates in the middle; In the diagram, 1 is the third support column, 2 is the deflection wheel, 3 is the slide rail, 4 is the universal joint shaft, 5 is the fixing cover, 6 is the first motor, 7 is the second motor, 8 is the vibration pump, 9 is the second fixing plate, 10 is the first spring, 11 is the connecting plate, 12 is the first clamp, 13 is the second clamp, 14 is the cylinder, 15 is the first fixing plate, 16 is the second support column, 17 is the first fixing rod, 18 is the first fixing buckle, 19 is the first support column, 20 is the base, 21 is the second spring, 22 is the first sliding shaft, 23 is the second sliding shaft, 24 is the slider, 25 is the first positioning screw, 26 is the concave frame, and 27 is the second positioning screw. 28 is the second slider base, 29 is the fixed shaft, 30 is the first slider base, 31 is the second connecting rod, 32 is the first connecting rod, 33 is the third connecting rod, 34 is the upper receiving plate, 35 is the flange, 36 is the lower receiving plate, 37 is the rope buckle, 38 is the third spring, 39 is the second connecting ring, 40 is the threaded rotating rod, 41 is the transmission cylinder, 42 is the first connecting ring, 43 is the connecting block, 44 is the fourth support column, 45 is the second fixing buckle, 46 is the second fixing rod, 47 is the first transmission rod, 48 is the connecting tray, 49 is the second transmission rod, 50 is the third transmission rod, 51 is the first rotating shaft, and 52 is the conveyor belt. Detailed Implementation

[0016] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] Example 1

[0018] like Figure 1-10As shown, a Hopkinson bar delamination test concrete specimen preparation device includes a clamping mechanism, a vibration mechanism, and a dual-motor synchronous drive mechanism. The clamping mechanism includes a base 20 and a first support column 19. The lower end of the first support column 19 is fixedly connected to the upper surface of the base 20. The upper end of the first support column 19 is rotatably connected to a second support column 16 via a first rotating shaft 51. Symmetrically arranged first fixing buckles 18 are fixedly installed on the upper end of the first support column 19 and the lower right end of the second support column 16. A first fixing rod 17 is inserted into each pair of first fixing buckles 18. The first fixing buckles 18 and the first fixing rod 17 cooperate to restrict the rotation of the second support column 16. A horizontally oriented first fixing plate 15 is fixedly installed above the second support column 16, and the first fixing plate 15 can rotate with the second support column 16. A cylinder 14 is fixedly installed on the outer end of the upper surface of the first fixed plate 15. The piston rod of the cylinder 14 is fixedly connected to one end of the first connecting rod 32. The other end of the first connecting rod 32 is hinged to one end of the second connecting rod 31 and one end of the third connecting rod 33, respectively. The other ends of the second connecting rod 31 and the third connecting rod 33 are hinged to one end of the first slider base 30 and one end of the second slider base 28, respectively. The adjacent sides of the first slider base 30 and the second slider base 28 are integrally formed with symmetrically arranged protruding plates. The outer end of the protruding plate has a round hole. A fixed shaft 29 is fixedly installed on the first fixed plate 15 at the position corresponding to the round hole of the protruding plate. The fixed shaft 29 passes through the round hole of the protruding plate. By extending and retracting the piston rod of the cylinder 14, the first slider base 30 and the second slider base 28 can rotate relative to the first fixed plate 15. A first sliding groove is provided on the upper part of the first slider base 30 and the second slider base 28. A first clamp 12 and a second clamp 13 are symmetrically arranged and slidably installed in the first sliding groove. The front ends of the first clamp 12 and the second clamp 13 are symmetrically provided with semi-circular grooves, which are adapted to the outer diameter of the concrete specimen. The other end of the first slider base 30 and the other end of the second slider base 28 are symmetrically provided with horizontal threaded holes. After the first clamp 12 and the second clamp 13 are adjusted and positioned in the first slider base 30 and the second slider base 28, the second positioning screw 27 is screwed into the threaded hole. The first clamp 12 and the second clamp 13 are fixed by the second positioning screw 27, and the extension length of the first clamp 12 and the second clamp 13 can be adjusted.

[0019] The vibration mechanism includes a third support column 1, the lower end of which is fixedly connected to the base 20. The third support column 1 and the first support column 19 are arranged opposite each other on the upper surface of the base 20. A horizontal second fixing plate 9 is fixedly installed on the upper end of the third support column 1. Two vertical connecting plates 11 are symmetrically fixedly installed below the second fixing plate 9. A concave frame 26 is movably arranged between the two connecting plates 11, with the opening of the concave frame 26 facing downward. The two connecting plates 11 are connected to the concave frame 26 by several horizontal first sliding shafts 22. One end of each first sliding shaft 22 is fixedly connected to the outside of the concave frame 26, and the other end is slidably connected to the connecting plate 11, allowing the concave frame 26 to move left and right relative to the connecting plate 11. A first spring 10 is fitted around the outer periphery of the first sliding shaft 22 between each connecting plate 11 and the concave frame 26. The two ends of the first spring 10 are fixedly connected to the connecting plate 11 and the concave frame 26, respectively. A vibratory pump 8 is fixedly installed in a concave frame 26. A vertical second sliding shaft 23 is also fixedly installed in the concave frame 26. The vibratory pump 8 is slidably connected to the second sliding shaft 23, allowing it to move up and down along the second sliding shaft 23. A second spring 21 is fitted onto the second sliding shaft 23 between the vibratory pump 8 and the concave frame 26. The two ends of the second spring 21 are fixedly connected to the concave frame 26 and the vibratory pump 8, respectively. During vibration, the first spring 10 and the second spring 21 restrict the position of the vibratory pump 8 and provide a certain degree of freedom. Deflecting wheels 2 are rotatably connected to the front and rear sides of the vibratory pump 8. The deflecting wheels 2 are fan-shaped and rotate with the vibration of the vibratory pump 8. When the deflecting wheels 2 rotate, they generate multi-directional centrifugal force, eliminating the directional aggregation of concrete air bubbles caused by traditional unidirectional vibration. A vertical slide rail 3 is fixedly installed at the lower end of the vibratory pump 8. A slider 24 is slidably connected in the slide rail 3. A fixed cover 5 is fixedly connected below the slider 24 via a universal joint shaft 4, allowing it to move up and down with the slider 24. The slide rail 3 is threaded on one side and a first positioning screw 25 is provided. After the slider 24 is adjusted and positioned in the slide rail 3, the first positioning screw 25 presses and fixes the slider 24, which can adjust the position of the fixed cover 5 relative to the vibration pump 8.

[0020] The dual-motor synchronous drive mechanism includes a first motor 6 and a second motor 7 fixedly mounted on the base 20. The first motor 6 is located below the vibration pump 8. Four fourth support columns 44 are evenly distributed around the outer periphery of the first motor 6. The fourth support columns 44 are inverted L-shaped. The lower end of the fourth support column 44 is fixedly connected to the base 20, and a connecting block 43 is fixedly mounted on the upper end of the fourth support column 44. The connecting block 43 is located directly above the first motor 6. A transmission cylinder 41 is rotatably mounted inside the connecting block 43 via bearings. A threaded rotating rod 40 is rotatably mounted inside the transmission cylinder 41 via bearings. The upper end of the threaded rotating rod 40 is provided with external threads at a position outside the transmission cylinder 41. The lower end of the threaded rotating rod 40 is fixedly connected to the output shaft of the first motor 6, and the first motor 6 can control the rotation of the threaded rotating rod 40. A conveyor belt 52 is embedded in the lower part of the transmission cylinder 41. The conveyor belt 52 is connected to the output shaft of the second motor 7, and the second motor 7 can control the rotation of the transmission cylinder 41. A first connecting ring 42 is fixedly installed on the outer periphery of the transmission cylinder 41. The first connecting ring 42 is hinged to one end of three first transmission rods 47, and each first transmission rod 47 is equidistantly distributed along the circumference of the first connecting ring 42. The other end of each first transmission rod 47 is hinged to a third transmission rod 50. A second sliding groove is provided at the lower part of each third transmission rod 50. A second connecting ring 39 is screwed onto the threaded part of the upper part of the threaded rotating rod 40. The upper ends of three second transmission rods 49 are hinged to the outer periphery of the second connecting ring 39. The lower end of each second transmission rod 49 slides in cooperation with the second sliding groove of the third transmission rod 50. When in use, the second connecting ring 39 descends, and the lower end of the third transmission rod 50 can be moved outward through the first transmission rods 47 and the second transmission rods 49. Each third transmission rod 50 has a connecting tray 48 fixedly installed at one end of its upper end. A third spring 38 is fixedly connected to the other end of the connecting tray 48. Each third spring 38 is a high-strength spring. A lower receiving plate 36 is fixedly installed at the upper end of the third spring 38. The lower receiving plate 36 is an arc-shaped plate with an arc of 120°. A rope buckle 37 is fixedly installed on the outer periphery of the lower receiving plate 36. A rope passes through the rope buckle 37 to fix the three lower receiving plates 36. The three lower receiving plates 36 enclose and form a lower receiving cavity. A pair of second fixing buckles 45 are symmetrically fixed on the outer side of the rope buckle 37 and the upper surface of the connecting tray 48. A second fixing rod 46 is inserted into the pair of second fixing buckles 45. An upper receiving plate 34 is fixedly connected to the upper receiving plate 36 through a flange 35. The upper receiving plate 34 is an arc-shaped plate with an arc of 120°. The three upper receiving plates 34 enclose and form an upper receiving cavity. In Embodiment 1 of the present invention, both the upper receiving plate 34 and the lower receiving plate 36 are arc-shaped plates with an arc of 120°, which facilitate demolding and can avoid damage to the edges of the concrete specimen during the demolding process.

[0021] Example 2

[0022] The method of using the Hopkinson bar delamination test concrete specimen preparation device described in Example 1 is as follows: the initial state of the preparation device is that the second fixing rod 46 is inserted into the pair of second fixing buckles 45, the three upper receiving plates 34 and the three lower receiving plates 36 are all in a combined state, and the inner surfaces of the upper receiving plates 34 and the lower receiving plates 36 are coated with concrete release agent.

[0023] First, the upper receiving plate 34 is fixedly installed above the lower receiving plate 36 via flange 35. A rope is threaded through the rope buckle 37 on the outer periphery of the lower receiving plate 36 to further secure the lower receiving plate 36, forming a sealed container structure with a lower receiving cavity and an upper receiving cavity. Concrete is poured into the upper receiving plate 34 from above. After the concrete is poured, the fixing cover 5 is moved down until it contacts the upper end of the upper receiving plate 34.

[0024] Remove the second fixing rod 46 and start the vibration pump 8. The vibration pump 8 drives the deflection wheels 2 on both sides to generate multi-directional centrifugal force. The vibration pump 8 moves left and right through the first spring 10 and moves up and down through the second spring 21. The displacement generates vibration (irregular shaking). The vibration is transmitted to the upper receiving plate 34 and the lower receiving plate 36 through the fixing cover 5 to vibrate the concrete.

[0025] While starting the vibration pump 8, the first motor 6 and the second motor 7 are run synchronously. The upper receiving plate 34 and the lower receiving plate 36 are rotated through the first transmission rod 47, the second transmission rod 49 and the third transmission rod 50, so that the vibration energy is evenly distributed around the circumference of the concrete specimen. After vibration is completed, the vibration pump 8, the first motor 6 and the second motor 7 are turned off. After the concrete has solidified, the second fixing rod 46 is installed, the rope in the rope buckle 37 is removed, and the fixing cover 5 is lifted upward until the fixing cover 5 is away from the upper end of the upper receiving plate 34. After removing the upper receiving plate 34 from the flange 35, adjust the extension lengths of the first clamp 12 and the second clamp 13 to the corresponding positions using the second positioning screw 27. Then, start the cylinder 14 to retract the piston rod, clamp the upper part of the concrete specimen using the first clamp 12 and the second clamp 13, start the first motor 6, lock the second motor 7, control the threaded rotating rod 40 to rotate, causing the second connecting ring 39 to move downwards, driving the lower end of the third transmission rod 50 to move outwards, separating the lower receiving plate 36. Remove the first fixing rod 17, rotate the second support column 16, and transfer the concrete specimen to another position.

[0026] In the embodiments of the present invention, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0027] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A device for preparing concrete specimens for the Hopkinson bar delamination test, comprising an upper receiving cavity, a lower receiving cavity, and a vibration mechanism, wherein the upper receiving cavity and the lower receiving cavity are fixedly connected to form a container for receiving concrete specimens, characterized in that, The upper and lower accommodating cavities can rotate horizontally. The vibration mechanism includes a vibration pump (8) that can move up, down, left, and right. The front and rear sides of the vibration pump (8) are respectively equipped with fan-shaped deflection wheels (2). The lower end of the vibration pump (8) is equipped with a vertical slide rail (3). A slider (24) is slidably installed in the slide rail (3). A fixing cover (5) is installed below the slider (24) through a universal connecting shaft (4). The fixing cover (5) is located above the upper accommodating cavity. A first positioning screw (25) is threadedly connected to one side of the slide rail (3). The upper receiving cavity includes three upper receiving plates (34), and the lower receiving cavity includes three lower receiving plates (36). Both the upper receiving plates (34) and the lower receiving plates (36) are arc-shaped plates with a 120° arc. The first motor (6) is located below the vibrating pump (8). Several fourth support columns (44) are evenly distributed around the outer periphery of the first motor (6). A connecting block (43) is fixedly installed on the upper end of the fourth support column (44). A transmission cylinder (41) is rotatably installed inside the connecting block (43). A threaded rotating rod (40) is rotatably installed inside the transmission cylinder (41). The lower end of the threaded rotating rod (40) is connected to the output shaft of the first motor (6). A conveyor belt (52) is embedded in the lower part of the transmission cylinder (41). The conveyor belt (52) is connected to the output shaft of the second motor (7). A first connecting ring (42) is fixedly installed on the outer periphery of the transmission cylinder (41). The ring (42) is hinged to one end of three first transmission rods (47), and the first transmission rods (47) are equidistantly distributed around the first connecting ring (42). The other end of the first transmission rod (47) is hinged to the third transmission rod (50). The lower part of the third transmission rod (50) has a second sliding groove. The upper part of the threaded rotating rod (40) is screwed to the second connecting ring (39). The outer circumference of the second connecting ring (39) is hinged to the upper ends of the three second transmission rods (49). The lower end of the second transmission rod (49) slides with the second sliding groove of the third transmission rod (50). The upper end of the third transmission rod (50) is fixedly installed with a connecting tray (48). The upper part of the connecting tray (48) is fixedly installed with a third spring (38). The upper end of the third spring (38) is fixedly installed with a lower receiving plate (36). The upper receiving plate (34) is fixedly installed above the lower receiving plate (36) through a flange (35). The upper end of the third support column (1) is fixedly installed with a second horizontal fixing plate (9). Two vertical connecting plates (11) are symmetrically fixedly installed below the second fixing plate (9). A concave frame (26) is movably set between the two connecting plates (11), with the opening of the concave frame (26) facing downward. The two connecting plates (11) are connected to the concave frame (26) through a first horizontal sliding shaft (22). A first spring (10) is fitted around the outer periphery of the first sliding shaft (22) between the connecting plate (11) and the concave frame (26). A vibration pump (8) is fixedly installed in the concave frame (26). A second vertical sliding shaft (23) is fixedly installed in the concave frame (26). The vibration pump (8) is slidably connected to the second sliding shaft (23). A second spring (21) is fitted on the second sliding shaft (23) between the vibration pump (8) and the concave frame (26).

2. The apparatus for preparing concrete specimens for the Hopkinson bar delamination test according to claim 1, characterized in that, The upper end of the first support column (19) is rotatably connected to the second support column (16) via the first rotating shaft (51). A horizontal first fixing plate (15) is fixedly installed above the second support column (16). A cylinder (14) is fixedly installed on the outer end of the upper surface of the first fixing plate (15). The piston rod of the cylinder (14) is fixedly connected to one end of the first connecting rod (32). The other end of the first connecting rod (32) is hinged to one end of the second connecting rod (31) and one end of the third connecting rod (33). The other ends of the second connecting rod (31) and the third connecting rod (33) are respectively connected to one end of the first slider base (30) and the second slider. One end of the base (28) is hinged. The first slider base (30) and the second slider base (28) are integrally formed with symmetrical convex plates on adjacent sides. The outer end of the convex plate has a round hole. The first fixing plate (15) is fixedly set with a fixing shaft (29) corresponding to the round hole of the convex plate. The fixing shaft (29) passes through the round hole of the convex plate. The first slider base (30) and the second slider base (28) are provided with a first sliding groove. The first clamp (12) and the second clamp (13) are slidably installed in the first sliding groove. The front end of the first clamp (12) and the second clamp (13) are symmetrically opened with semi-circular grooves. The semi-circular grooves are adapted to the outer diameter of the concrete specimen.

3. The apparatus for preparing concrete specimens for the Hopkinson bar delamination test according to claim 1, characterized in that, A rope buckle (37) is fixedly installed on the outer periphery of the lower receiving plate (36). A pair of second fixing buckles (45) are symmetrically fixed on the outer side of the rope buckle (37) and the upper surface of the connecting tray (48). A second fixing rod (46) is inserted into the second fixing buckle (45).

4. The apparatus for preparing concrete specimens for the Hopkinson bar delamination test according to claim 3, characterized in that, The fourth support column (44) is inverted L-shaped.

5. The apparatus for preparing concrete specimens for the Hopkinson bar delamination test according to claim 2, characterized in that, First fixing buckles (18) are symmetrically arranged and fixedly installed on one side of the upper end of the first support column (19) and the lower end of the second support column (16). First fixing rods (17) are inserted into a pair of first fixing buckles (18).

6. The apparatus for preparing concrete specimens for the Hopkinson bar delamination test according to claim 5, characterized in that, The other end of the first slider base (30) and the other end of the second slider base (28) are symmetrically provided with horizontal threaded holes, and the second positioning screw (27) is screwed into the threaded holes.

7. The method of using the Hopkinson bar delamination test concrete specimen preparation device as described in claim 2, characterized in that, Includes the following steps: First, fix the upper receiving plate (34) above the lower receiving plate (36) through the flange (35), then inject concrete into the upper receiving plate (34). After the concrete is injected, move the fixing cover (5) down until the fixing cover (5) contacts the upper end of the upper receiving plate (34). Start the vibratory pump (8), which drives the deflection wheels (2) on both sides to generate multi-directional centrifugal force. The vibratory pump (8) moves left and right and up and down, generating vibration through the displacement. The vibration is transmitted to the upper and lower accommodating cavities through the fixed cover (5) to vibrate the concrete. While starting the vibratory pump (8), the first motor (6) and the second motor (7) are run synchronously. The upper receiving plate (34) and the lower receiving plate (36) are controlled to rotate through the first transmission rod (47), the second transmission rod (49) and the third transmission rod (50), so that the vibration energy is evenly distributed around the concrete specimen. After vibration is completed, the vibratory pump (8) and the first motor (6) and the second motor (7) are turned off. After the concrete solidifies, the fixing cover (5) is lifted upward until the fixing cover (5) is far away from the upper end of the upper receiving plate (34). ; Remove the flange (35) and take off the upper receiving plate (34). After adjusting the extension length of the first clamp (12) and the second clamp (13) to the corresponding position, start the cylinder (14) to retract the piston rod. Clamp the upper part of the concrete specimen through the first clamp (12) and the second clamp (13). Start the first motor (6) and lock the second motor (7). Control the threaded rotating rod (40) to rotate so that the second connecting ring (39) moves down and drives the lower end of the third transmission rod (50) to move outward and separate the lower receiving plate (36).

8. The method of using the Hopkinson bar delamination test concrete specimen preparation device according to claim 7, characterized in that, The initial state of the preparation device is that the three upper receiving plates (34) and the three lower receiving plates (36) are in a combined state, and the inner surfaces of the upper receiving plates (34) and the lower receiving plates (36) are coated with concrete release agent.

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