A kind of hopkinson bar layer splitting experimental concrete test piece polishing device and method of use

Abstract

This invention belongs to the field of Hopkinson bar delamination testing, and relates to a grinding device and method for using concrete specimens in the Hopkinson bar delamination test. The grinding device includes grinding mechanisms for the left end face, circumferential surface, and right end face. In the circumferential surface grinding mechanism, first and second connecting rings are fitted onto both ends of a third drive shaft. Four drive rods are movably arranged on the outer circumference of the third drive shaft. A drive collar is screwed onto the circumferential surface of the left end of the second drive shaft. A third connecting ring is arranged on the outer circumference of the drive collar, and the third connecting ring is hinged to the drive rods. A first sliding groove is provided at the left end of the drive rod, and a first slider is arranged within the first sliding groove. An arc-shaped connecting block is arranged on the first slider, and a grinding disc is installed on the inner arc surface of the arc-shaped connecting block. The grinding device is used to grind the two end faces of the specimen using the left and right end face grinding mechanisms, and to grind the circumferential surface of the specimen using the circumferential surface grinding mechanism. This invention achieves automatic grinding of the entire circumference of the specimen, improving the uniformity of the specimen surface.

Description

Technical Field

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

[0002] The Hopkinson bar spalling test is an important tool for studying the dynamic mechanical behavior and spalling failure mechanism of brittle materials such as concrete under high strain rates. The experiment requires specimens with high-precision geometric dimensions and surface finish to ensure uniform propagation of stress waves within the specimen. This avoids stress concentration or waveform distortion caused by surface defects or dimensional deviations, which could affect the accuracy of key parameters such as the spalling threshold and dynamic strength.

[0003] However, existing concrete specimen grinding processes have significant shortcomings. Traditional methods rely heavily on manual operation, using sandpaper or hand-held grinders for surface treatment. The drawbacks include: (1) difficulty in precision control: manual grinding easily leads to substandard specimen surface flatness, and local unevenness or tilting may cause abnormal stress wave reflection; (2) low efficiency: concrete specimens have high hardness and wear quickly, and manual grinding is time-consuming and difficult to ensure the consistency of batch specimens; (3) poor adaptability: the Hopkinson bar test has strict requirements for parameters such as specimen length-to-diameter ratio and end face parallelism. Existing general grinding equipment lacks special fixtures, and the adjustment process is cumbersome; (4) environmental hazards: the dust pollution generated by grinding is serious and threatens the health of manual grinding personnel. Therefore, developing an automated grinding device specifically for concrete specimens in the Hopkinson bar delamination test, which combines high precision, high efficiency and environmental friendliness, has become a key technical requirement for improving the reliability of experimental data and promoting dynamic mechanics research. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a grinding device and method for using concrete specimens in the Hopkinson bar delamination test. The technical solution adopted by this invention is as follows: A grinding device for concrete specimens used in the Hopkinson bar delamination test includes a left end face grinding mechanism, a circumferential surface grinding mechanism, and a right end face grinding mechanism arranged from left to right. The circumferential surface grinding mechanism includes a third motor, a fourth motor, a third drive shaft, a second drive shaft, and grinding discs. The fourth motor is drivenly connected to the second drive shaft, and the third motor is drivenly connected to the third drive shaft. A first connecting ring is fitted onto the outer circumference of the right end of the third drive shaft, and a second connecting ring is fitted onto the outer circumference of the left end of the third drive shaft. Four drive rods are symmetrically and evenly distributed and movable around the outer circumference of the third drive shaft, with the right end of each drive rod hinged to the first connecting ring. The left end of the transmission rod is hinged to the second connecting ring; a thread is opened on the circumference of the left end of the second transmission shaft, and a transmission collar is screwed onto the threaded part. A third connecting ring is set on the outer circumference of the transmission collar, and the third connecting ring is hinged to the transmission rod; a first sliding groove is set on the left end of the transmission rod, and a first slider is slidably set in the first sliding groove. Multiple threaded holes are opened on the first slider, and a through groove is opened on one side of the first sliding groove corresponding to the threaded holes. An arc-shaped connecting block is fixedly set on the adjacent end face of the four first sliders, and a grinding disc is fixedly installed on the inner arc surface of the arc-shaped connecting block. The size of the cylinder formed by the grinding disc matches the size of the concrete specimen to be ground.

[0005] Preferably, the left end face grinding mechanism includes a second motor, a third support column, and a second grinding column. The third support column includes two F-shaped vertical plates arranged opposite each other. A second sliding groove is provided on the adjacent sides of the two F-shaped vertical plates. A second slider is slidably connected in the second sliding groove. A guide column groove is opened on the upper horizontal plate of the F-shaped vertical plates. The guide column is movably installed in the guide column groove. The lower end of the guide column is fixedly connected to the upper surface of the second slider. A horizontal transmission column is rotatably connected inside the second slider. A positioning ring is rotatably connected to the outer circumference of the transmission column through a fifth bearing. The second slider is clamped on the positioning ring. The right end of the transmission column is fixedly connected to the second grinding column. A support ring is fixedly installed on the outer circumference of the right end of the second grinding column. A support groove that cooperates with the support ring is opened on the left end of the arc-shaped connecting block. The left end of the transmission column is movably connected to the right end of the universal joint through a hinge structure. The left end of the universal joint is hingedly connected to the third slider in the third sliding groove. A clamping cylinder is fixedly installed at one end of the third sliding groove. The piston rod of the clamping cylinder is fixedly connected to the third slider.

[0006] Preferably, the right end face grinding mechanism includes a first motor and a first grinding column, the output shaft of the first motor is fixedly connected to the right end of the first transmission shaft, and the left end of the first transmission shaft is fixedly connected to the first grinding column.

[0007] Preferably, the right end of the transmission rod is hinged to the first connecting ring via the first connecting rod, the left end of the transmission rod is hinged to the second connecting ring via the second connecting rod, and the third connecting ring is hinged to the transmission rod via the third connecting rod.

[0008] Preferably, the third drive shaft is rotatably connected to the second drive shaft via a third bearing, the fourth motor is connected to the second drive shaft via a first belt drive assembly, and the third motor is connected to the third drive shaft via a second belt drive assembly.

[0009] Preferably, the output shaft of the second motor is rotatably connected to the upper part of the fourth support through the sixth bearing, and the output shaft of the second motor is fixedly connected to the center position of the back of the slide opening of the third slide.

[0010] Preferably, the first motor is fixedly mounted on the upper right side of the first support column, and the first drive shaft is rotatably connected to the first support column through the first bearing.

[0011] Preferably, the left end face grinding mechanism, the circumferential surface grinding mechanism, and the right end face grinding mechanism are fixedly mounted on the base of the long strip-shaped structure.

[0012] The aforementioned method of using a hopkinson bar spallation test concrete specimen grinding device includes the following steps: The control cylinder's action drives the third slider to move. The third slider self-adjusts within the third slide groove along with the universal joint. The universal joint moves the second slider to the right, causing the right end face of the second grinding column to align with the left end face of the concrete specimen. The second motor is activated, while the other motors remain locked. The third slide groove rotates, and the universal joint drives the second grinding column to rotate, grinding the left end face of the concrete specimen. The first motor is activated, while the other motors remain locked. The first transmission shaft drives the first grinding column to rotate, grinding the right end face of the concrete specimen. During end face grinding, the control cylinder continuously operates to provide clamping force. The third and fourth motors are started, while the other motors are locked. The third motor drives the third drive shaft to rotate, which in turn drives the first slider and the arc-shaped connecting block to rotate via the drive rod. The grinding discs are used to grind the circumferential surface of the concrete specimen. During the grinding process, the continuous operation of the fourth motor provides clamping force.

[0013] Preferably, before grinding, select an arc-shaped connecting block and a first slider that match the size of the concrete specimen, install the first slider into the first groove and slide it into place, place the concrete specimen in the cylindrical space enclosed by the arc-shaped connecting block and the grinding disc, start the fourth motor, and keep the other motors locked. The fourth motor controls the second drive shaft to rotate, causing the drive collar to move to the left, so that each drive rod drives the arc-shaped connecting block to close. The arc-shaped connecting block and the grinding disc clamp the circumferential surface of the concrete specimen. After the concrete specimen is installed, the right end face of the concrete specimen automatically fits against the left end face of the first grinding column. After grinding is completed, control the third and fourth motors to stop rotating, control the clamping cylinder to move the third slider, and use the third slider and universal joint to move the second slider to the left. Start the fourth motor to control the transmission sleeve to move to the right, so that the arc-shaped connecting block opens and the concrete specimen is taken out.

[0014] The beneficial effects of this invention are: This invention provides a grinding device and method for concrete specimens used in the Hopkinson bar delamination test. Through coordinated control of a clamping mechanism and a high-rigidity grinding component, it achieves precise adjustment of specimen dimensional accuracy (such as aspect ratio and end-face parallelism) and surface smoothness, effectively eliminating interference factors in stress wave propagation and ensuring the accuracy of dynamic mechanical parameters (such as delamination threshold and dynamic strength) measurements in the delamination test. During use, the invention employs an arc-shaped connecting block that matches the size of the concrete specimen. The grinding disc within the arc-shaped connecting block simultaneously grinds the circumferential surface of the specimen, improving surface uniformity and preventing surface cracks caused by uneven grinding. The use of this invention reduces occupational health risks associated with manual grinding and complies with green laboratory standards. 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 three-dimensional structural diagram of the polishing device according to an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 Full sectional view of the circumferential surface grinding mechanism; Figure 4 for Figure 3 A magnified view of a section at point B in the middle; Figure 5 for Figure 1 A three-dimensional structural diagram of the circumferential surface grinding mechanism; Figure 6 for Figure 5 A magnified view of a section at point C; Figure 7 for Figure 1 Schematic diagram of the structure of the transmission collar; Figure 8 for Figure 1 Top view of the grinding mechanism on the left side of the middle section; Figure 9 for Figure 8 A cross-sectional view along the DD direction; Figure 10This is a right view of the left end face grinding mechanism according to an embodiment of the present invention; Figure 11 for Figure 1 A schematic diagram of the structure of the first chute in the middle; In the diagram, 1 is the third slide groove, 2 is the guide post, 3 is the second slider, 4 is the first slider, 5 is the first slide groove, 6 is the third connecting rod, 7 is the second connecting rod, 8 is the transmission rod, 9 is the third transmission shaft, 10 is the second transmission shaft, 11 is the first support column, 12 is the first motor, 13 is the second motor, 14 is the fourth support column, 15 is the third support column, 16 is the second grinding column, 17 is the support ring, 18 is the arc-shaped connecting block, 19 is the transmission collar, and 20 is the third motor. 21 is the second support column, 22 is the base, 23 is the fourth motor, 24 is the first connecting rod, 25 is the first connecting ring, 26 is the first transmission shaft, 27 is the concrete specimen, 28 is the fixing screw, 29 is the first grinding column, 30 is the third connecting ring, 31 is the second connecting ring, (32) is the support groove, 33 is the grinding disc, 34 is the third slider, 35 is the universal joint, 36 is the transmission column, 37 is the positioning ring, 38 is the second slide groove, and 39 is the clamping cylinder. 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. Example 1

[0017] like Figure 1-11 As shown, a Hopkinson bar delamination test concrete specimen grinding device includes a right end face grinding mechanism, a circumferential surface grinding mechanism and a left end face grinding mechanism fixedly installed on a base 22. The base 22 is a long strip plate structure, which can be placed on the workshop floor.

[0018] The right-side end face grinding mechanism includes a first support column 11 fixedly installed at the right end of the base 22. A first motor 12 is fixedly installed on the upper right side of the first support column 11. The output shaft of the first motor 12 is fixedly connected to a first transmission shaft 26. Starting the first motor 12 can control the rotation of the first transmission shaft 26. The first transmission shaft 26 and the first support column 11 are rotatably connected through a first bearing, which is located on the upper part of the first support column 11. A first grinding column 29 is fixedly connected to the left end of the first transmission shaft 26.

[0019] The circumferential surface grinding mechanism includes a second drive shaft 10 and a grinding disc 33. The second drive shaft 10 is fitted around the outer circumference of the first drive shaft 26, and the second drive shaft 10 and the first drive shaft 26 are rotatably connected via a second bearing. A fourth motor 23 is fixedly mounted below the first motor 12. The fourth motor 23 is connected to the second drive shaft 10 via a first belt drive assembly. Starting the fourth motor 23 controls the rotation of the second drive shaft 10 via the first belt drive assembly. A third drive shaft 9 is fitted around the outer circumference of the second drive shaft 10, and the third drive shaft 9 is rotatably connected to the second drive shaft 10 via a third bearing. A second support column 21 is located at the right end of the third drive shaft 9, and the second support column 21 is rotatably connected to the right end of the third drive shaft 9 via a fourth bearing, providing support for the third drive shaft 9. A third motor 20 is located below the second support column 21, and the third motor 20 is connected to the third drive shaft 9 via a second belt drive assembly. Starting the third motor 20 controls the rotation of the third drive shaft 9 via the second belt drive assembly. A first connecting ring 25 is provided on the upper left side of the second support column 21. The first connecting ring 25 is fixedly connected to the right end of the third transmission shaft 9 and can rotate with the third transmission shaft 9. A second connecting ring 31 is provided on the left side of the first connecting ring 25. The second connecting ring 31 is fixedly connected to the left end of the third transmission shaft 9 and can rotate with the third transmission shaft 9. Four transmission rods 8 are symmetrically and evenly distributed on the outer circumference of the third transmission shaft 9. The right end of each transmission rod 8 is hinged to the first connecting ring 25 through the first connecting rod 24, and the left end of each transmission rod 8 is hinged to the second connecting ring 31 through the second connecting rod (7). A thread is provided on the circumference of the left end of the second transmission shaft 10. A transmission sleeve 19 is screwed onto the threaded part and is threadedly connected to the second transmission shaft 10. A third connecting ring 30 is connected to the outer circumference of the transmission sleeve 19. The third connecting ring 30 is hinged to each transmission rod 8 through the third connecting rod 6. In use, the second drive shaft 10 is rotated by the fourth motor 23, thereby causing the transmission collar 19 to move left and right along the second drive shaft 10, controlling the opening and closing of each transmission rod 8. A first slide groove 5 is fixedly installed on the left end of each transmission rod 8, and the first slide groove 5 can move with each transmission rod 8. A first slider 4 is slidably disposed within the first slide groove 5. Each first slider 4 has multiple threaded holes, and the first slide groove 5 has a through groove corresponding to the position of the threaded holes. A fixing screw 28 passes through the through groove on the first slide groove 5 and is screwed into the threaded hole on the first slider 4. After the first slider 4 is in place in the first slide groove 5, it is pressed and fixed by tightening the fixing screw 28, improving the stability of the first slider 4. An arc-shaped connecting block 18 is fixedly installed on the adjacent end face of each first slider 4. The four arc-shaped connecting blocks 18 form a cylinder to accommodate the concrete specimen 27. A grinding disc 33 is fixedly installed on the inner arc surface of the arc-shaped connecting block 18. The grinding disc 33 is used to grind the circumferential surface of the concrete specimen 27. The size of the cylinder formed by the four grinding discs 33 matches the size of the concrete specimen 27 to be ground.

[0020] The left-side end-face grinding mechanism includes a second motor 13, a fourth support column 14, a third support column 15, and a second grinding column 16. The fourth support column 14 and the third support column 15 are fixedly installed on the left end of the base 22. The third support column 15 includes two F-shaped vertical plates arranged opposite each other. A second sliding groove 38 is provided on the adjacent sides of the two F-shaped vertical plates. A second slider 3 is slidably connected in the second sliding groove 38. A guide column groove is opened on the upper horizontal plate of the F-shaped vertical plates. The guide column 2 is movably installed in the guide column groove. The lower end of the guide column 2 is fixedly connected to the upper surface of the second slider 3. When the second slider 3 moves horizontally in the second sliding groove 38, it is guided and limited by the guide column 2. A horizontal transmission column 36 is rotatably connected to the center position inside the second slider 3. A positioning ring 37 is rotatably connected to the outer periphery of the transmission column 36 through a fifth bearing. The second slider 3 is fixedly engaged with the positioning ring 37, so that the positioning ring 37 and the transmission column 36 can move left and right with the second slider 3. The right end of the transmission column 36 is fixedly connected to the second grinding column 16, which can rotate with the transmission column 36. A support ring 17 is fixedly installed on the outer periphery of the right end of the second grinding column 16, and each arc-shaped connecting block 18 has a support groove (32) on its left end that cooperates with the support ring 17. A universal joint 35 is provided on the left end of the transmission column 36, and the left end of the transmission column 36 is movably connected to the right end of the universal joint 35 through a hinge structure. A third slide groove 1 is provided on the left side of the universal joint 35, and the left end of the universal joint 35 is movably connected to the third slider 34 in the third slide groove 1. A clamping cylinder 39 is fixedly installed at one end of the third slide groove 1, and the piston rod of the clamping cylinder 39 is fixedly connected to the third slider 34. The third slider 34 slides in the third slide groove 1 through the action of the clamping cylinder 39, thereby realizing the horizontal movement of the second grinding column 16. A second motor 13 is installed on the left side of the third slide 1 and mounted on the fourth support column 14. The output shaft of the second motor 13 is rotatably connected to the upper part of the fourth support column 14 through the sixth bearing. The fourth support column 14 is fixedly installed at the leftmost end of the base 22. The output shaft of the second motor 13 is fixedly connected to the center position of the back of the slide opening of the third slide 1. The second motor 13 can control the rotation of the third slide 1. During the rotation of the third slide 1, it can drive the transmission column 36 and the second grinding column 16 to rotate. Example 2

[0021] The method of using the Hopkinson bar delamination test concrete specimen grinding device described in Example 1 includes the following steps: 1. Fix concrete specimen 27.

[0022] Select an arc-shaped connecting block 18 and a first slider 4 that match the size of the concrete specimen 27. Install the first slider 4 into the first groove 5. Place the concrete specimen 27 into the cylindrical space enclosed by the arc-shaped connecting block 18 and the first slider 4. Start the fourth motor 23, while the other motors are locked. The fourth motor 23 controls the rotation of the second drive shaft 10, causing the drive collar 19 to move to the left. This causes each drive rod 8 to close the arc-shaped connecting block 18, and the grinding disc 33 on the inner surface of the arc-shaped connecting block 18 reliably clamps the circumferential surface of the concrete specimen 27. After the concrete specimen 27 is installed, the right end face of the concrete specimen 27 automatically aligns with the left end face of the first grinding column 29.

[0023] 2. Grind the left and right end faces of the concrete specimen.

[0024] The action of the clamping cylinder 39 drives the third slider 34 to move. During the movement, the third slider 34 self-adjusts in the third slide groove 1 with the universal shaft 35. The second slider 3 is moved to the right through the universal shaft 35. During the movement of the second slider 3, the support ring 17 is inserted into the support groove (32). Lubricant can be applied to the inner surface of the support ring 17 before insertion to reduce the friction between the support ring 17 and the support groove (32). With the continuous action of the clamping cylinder 39, the right end face of the second grinding column 16 is finally made to fit against the left end face of the concrete specimen 27. The guide column 2 plays a guiding role during the movement of the second slider 3. The second motor 13 is started, and the other motors are locked. The third slide groove 1 rotates and the second grinding column 16 is rotated through the universal shaft 35. The left end face of the concrete specimen 27 is ground by the second grinding column 16.

[0025] The first motor 12 is started, and the other motors are locked. The first grinding column 29 is driven to rotate through the first transmission shaft 26, and the right end face of the concrete specimen 27 is ground by the first grinding column 29.

[0026] During the end face grinding process, the clamping cylinder 39 is continuously operated to provide a certain clamping force to the second grinding column 16 to ensure the grinding effect on the left and right end faces of the concrete specimen 27.

[0027] 3. Grind the circumferential surface of the concrete specimen 27.

[0028] The third motor 20 and the fourth motor 23 are started, and the speed of the fourth motor 23 is finely adjusted. The other motors are locked. The third motor 20 drives the third transmission shaft 9 to rotate, which in turn drives the first slider 4 and the arc-shaped connecting block 18 to rotate via the transmission rod 8. The grinding disc 33 then grinds the circumferential surface of the concrete specimen 27. During the grinding process, the continuous operation of the fourth motor 23 provides a certain clamping force to the grinding disc 33 to ensure the grinding effect on the circumferential surface of the concrete specimen 27.

[0029] IV. Remove the polished concrete specimen 27.

[0030] After grinding, control the third motor 20 and the fourth motor 23 to stop rotating, control the clamping cylinder 39 to move the third slider 34, and through the third slider 34 and the universal joint 35, make the second slider 3 move to the left. Start the fourth motor 23 to control the transmission collar 19 to move to the right, so that the arc-shaped connecting block 18 opens and the concrete specimen 27 is taken out.

[0031] Through the above four steps, the entire circumference of the concrete specimen 27 was simultaneously ground.

[0032] 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.

[0033] 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 grinding device for concrete specimens used in the Hopkinson bar delamination test, comprising a left end face grinding mechanism, a circumferential surface grinding mechanism, and a right end face grinding mechanism arranged from left to right, characterized in that, The circumferential surface polishing mechanism includes a third motor (20), a fourth motor (23), a third transmission shaft (9), a second transmission shaft (10), and a polishing disc (33). The fourth motor (23) is connected to the second transmission shaft (10), and the third motor (20) is connected to the third transmission shaft (9). A first connecting ring (25) is fitted on the outer circumference of the right end of the third transmission shaft (9), and a second connecting ring (31) is fitted on the outer circumference of the left end of the third transmission shaft (9). Four transmission rods (8) are symmetrically and evenly distributed on the outer circumference of the third transmission shaft (9). The right end of the transmission rod (8) is hinged to the first connecting ring (25), and the left end of the transmission rod (8) is hinged to the second connecting ring (31). The second transmission shaft (10) A thread is opened on the left end circumference, and a transmission collar (19) is screwed into the threaded part. A third connecting ring (30) is set on the outer circumference of the transmission collar (19). The third connecting ring (30) is hinged to the transmission rod (8). A first sliding groove (5) is set on the left end of the transmission rod (8). A first slider (4) is slidably set in the first sliding groove (5). Multiple threaded holes are opened on the first slider (4). A through groove is opened on one side of the first sliding groove (5) corresponding to the threaded holes. An arc-shaped connecting block (18) is fixedly set on the adjacent end face of the four first sliders (4). A grinding disc (33) is fixedly installed on the inner arc surface of the arc-shaped connecting block (18). The size of the cylinder formed by the grinding disc (33) matches the concrete specimen (27) to be ground. The left end face grinding mechanism includes a second motor (13), a third support column (15), and a second grinding column (16). The third support column (15) includes two F-shaped vertical plates arranged opposite each other. A second slide groove (38) is provided on the adjacent sides of the two F-shaped vertical plates. A second slider (3) is slidably connected in the second slide groove (38). A guide column slide groove is opened on the upper horizontal plate of the F-shaped vertical plate. The guide column (2) is movably installed in the guide column slide groove. The lower end of the guide column (2) is fixedly connected to the upper surface of the second slider (3). The second slider (3) is rotatably connected to a horizontal transmission column (36). The outer periphery of the transmission column (36) is rotatably connected to a positioning ring ( ) through a fifth bearing. 37), the second slider (3) is mounted on the positioning ring (37), the right end of the transmission column (36) is fixedly connected to the second grinding column (16), the outer periphery of the right end of the second grinding column (16) is fixedly installed with the support ring (17), the left end of the arc-shaped connecting block (18) is opened with a support groove (32) that matches the support ring (17), the left end of the transmission column (36) is movably connected to the right end of the universal shaft (35) through a hinge structure, the left end of the universal shaft (35) is movably connected to the third slider (34) in the third slide groove (1) by hinge, one end of the third slide groove (1) is fixedly installed with a clamping cylinder (39), and the piston rod of the clamping cylinder (39) is fixedly connected to the third slider (34). The right end face grinding mechanism includes a first motor (12) and a first grinding column (29). The output shaft of the first motor (12) is fixedly connected to the right end of the first transmission shaft (26), and the left end of the first transmission shaft (26) is fixedly connected to the first grinding column (29).

2. The hopkinson bar delamination test concrete specimen grinding device according to claim 1, characterized in that, The right end of the transmission rod (8) is hinged to the first connecting ring (25) via the first connecting rod (24), the left end of the transmission rod (8) is hinged to the second connecting ring (31) via the second connecting rod (7), and the third connecting ring (30) is hinged to the transmission rod (8) via the third connecting rod (6).

3. The hopkinson bar delamination test concrete specimen grinding device according to claim 2, characterized in that, The third drive shaft (9) is rotatably connected to the second drive shaft (10) through the third bearing. The fourth motor (23) is connected to the second drive shaft (10) through the first belt drive assembly. The third motor (20) is connected to the third drive shaft (9) through the second belt drive assembly.

4. The hopkinson bar delamination test concrete specimen grinding device according to claim 1, characterized in that, The output shaft of the second motor (13) is rotatably connected to the upper part of the fourth support (14) through the sixth bearing, and the output shaft of the second motor (13) is fixedly connected to the center position of the back of the groove opening of the third groove (1).

5. The hopkinson bar delamination test concrete specimen grinding device according to claim 1, characterized in that, The first motor (12) is fixedly installed on the upper right side of the first support column (11), and the first transmission shaft (26) is rotatably connected to the first support column (11) through the first bearing.

6. The hopkinson bar delamination test concrete specimen grinding device according to claim 1, characterized in that, The left end face grinding mechanism, the circumferential surface grinding mechanism and the right end face grinding mechanism are fixedly installed on the base (22) of the long strip plate structure.

7. The method of using the Hopkinson bar delamination test concrete specimen grinding device as described in claim 1, characterized in that, Includes the following steps: The control clamping cylinder (39) moves the third slider (34), which adjusts adaptively in the third slide groove (1) with the universal joint (35). The second slider (3) is moved to the right through the universal joint (35) so that the right end face of the second grinding column (16) is in contact with the left end face of the concrete specimen (27). The second motor (13) is started, and the other motors are locked. The third slide groove (1) rotates and the second grinding column (16) is rotated through the universal joint (35). The left end face of the concrete specimen (27) is ground through the second grinding column (16). The first motor (12) is started, and the other motors are locked. The first grinding column (29) is rotated through the first drive shaft (26). The right end face of the concrete specimen (27) is ground through the first grinding column (29). During the end face grinding process, the control clamping cylinder (39) continuously operates to provide clamping force. Start the third motor (20) and the fourth motor (23), while the other motors are locked. The third motor (20) drives the third transmission shaft (9) to rotate, which in turn drives the first slider (4) and the arc-shaped connecting block (18) to rotate via the transmission rod (8). The grinding disc (33) grinds the circumferential surface of the concrete specimen (27). During the grinding process, the fourth motor (23) provides clamping force through continuous operation.

8. The method of using the Hopkinson bar delamination test concrete specimen grinding device according to claim 7, characterized in that, Before grinding, select an arc-shaped connecting block (18) and a first slider (4) that match the size of the concrete specimen (27). Install the first slider (4) into the first groove (5) and slide the first slider (4) into place. Place the concrete specimen (27) into the cylindrical space formed by the arc-shaped connecting block (18) and the grinding disc (33). Start the fourth motor (23). All other motors are locked. The fourth motor (23) controls the second transmission shaft (10) to rotate, causing the transmission collar (19) to move to the left. This causes each transmission rod (8) to drive the arc-shaped connecting block (18) to close. The arc-shaped connecting block (18) and the grinding disc (33) clamp the circumferential surface of the concrete specimen (27). After the concrete specimen (27) is installed, the right end face of the concrete specimen (27) automatically fits against the left end face of the first grinding column (29). After grinding, control the third motor (20) and the fourth motor (23) to stop rotating, control the clamping cylinder (39) to move the third slider (34), and through the third slider (34) and the universal joint (35), make the second slider (3) move to the left. Start the fourth motor (23) to control the transmission collar (19) to move to the right, so that the arc-shaped connecting block (18) opens and the concrete specimen (27) is taken out.

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