A compacting device for coarse-grained soil test blocks

Abstract

A compacting device for coarse-grained soil test blocks relates to a compacting device, wherein a knocking box is placed in the middle of the bottom of a frame, a compacting cylinder is arranged in the knocking box, one side of a swinging ball A contacts one side of a swinging ball B, the other side of the swinging ball B contacts the left end of a slide bar A, one side of a swinging ball C contacts one side of a swinging ball D, and the other side of the swinging ball C contacts the right end of a slide bar B; the present invention places the knocking box in the middle of the bottom of the frame, arranges a compacting cylinder in the knocking box, and two swinging balls are hung on the frame at positions on opposite sides of the knocking box. The four swinging balls use the Newton's pendulum principle to knock on the opposite sides of the compacting cylinder, thereby squeezing the coarse-grained soil and displacing and vibrating the coarse-grained soil to produce the coarse-grained soil test blocks, so that the produced compacts can simulate the influence of the resonance generated by high-speed railways and airports on the settlement of coarse-grained soil in actual use, making the experimental data more accurate.

Description

Technical Field

[0001] The invention relates to a compacting device, in particular to a compacting device for coarse-grained soil test blocks. Background Art

[0002] Coarse-grained soil, a term in engineering geology, refers to soil with a coarse-grained content greater than 50% in the sample. In the construction of airports with high-fill beneath high-speed rail tunnels, in order to save costs and increase soil quality, a large amount of coarse-grained soil needs to be filled and compacted to ensure its dry density and minimize the impact of settlement on the soil layer. In order to reduce transportation costs, local materials need to be used. However, for the sake of project quality, compaction tests need to be conducted on these locally sourced coarse-grained soils. During the test, test blocks need to be made and relevant data on the test blocks need to be tested. In order to minimize the impact of the resonance generated by the high-speed rail and the airport on the settlement of the coarse-grained soil, it is necessary to design a compaction device that can generate displacement and resonance to press the test blocks of the locally sourced coarse-grained soil. Summary of the Invention

[0003] In order to overcome the deficiencies in the background technology, the present invention discloses a compacting device for coarse-grained soil test blocks, which comprises a knocking box placed in the middle of the bottom of a frame, a compacting cylinder arranged in the knocking box, and two swinging balls hung on the frame at opposite sides of the knocking box. The four swinging balls utilize the Newton's cradle principle to knock on the opposite sides of the compacting cylinder, thereby squeezing the coarse-grained soil and displacing and vibrating the coarse-grained soil to produce the coarse-grained soil test blocks, thereby enabling the produced compacts to simulate the influence of the resonance generated by high-speed rail and airport on the settlement of the coarse-grained soil in actual use, thereby making the experimental data more accurate.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A compacting device for coarse-grained soil test blocks comprises a frame and a knocking box, the knocking box is placed in the middle of the bottom of the frame, a compacting cylinder is arranged in the knocking box, the compacting cylinder comprises a tube body, a tube cavity is arranged in the tube body, a slider A is slidably connected to the left end of the tube cavity, a slide bar A is provided at the center of the left side of the slider A, a slider B is slidably connected to the right end of the tube cavity, a slide bar B is provided at the center of the right side of the slider B, end covers are covered at both ends of the tube body, through holes are provided at the center of both end covers, the middle parts of the slide bar A and the middle parts of the slide bar B are slidably connected in the two through holes, the left end of the slide bar A extends to the left outside of the knocking box, and the right end of the slide bar B extends to the right outside of the knocking box, four parallel support shafts are arranged at intervals from left to right on the top of the frame, and the middle part of each support shaft is provided with a A ring is provided for rotation connection, and each end of the four swing rods is fixedly connected to the four rings. A swing ball A is provided at the other end of the leftmost swing rod, and a swing ball B is provided at the other end of the adjacent swing rod. One side of the swing ball A is in contact with one side of the swing ball B, and the other side of the swing ball B is in contact with the left end of the slide rod A. A swing ball D is provided at the other end of the rightmost swing rod, and a swing ball C is provided at the other end of the adjacent swing rod. One side of the swing ball C is in contact with one side of the swing ball D, and the other side of the swing ball C is in contact with the right end of the slide rod B. The straight line formed by the center of the swing ball A connecting the center of the swing ball B and the axis center of the slide rod A are in the same straight line, and the straight line formed by the center of the swing ball C connecting the center of the swing ball D and the axis center of the slide rod B are in the same straight line.

[0006] The compaction device for coarse-grained soil test blocks comprises a frame including a base plate, which has a square structure. Upward-extending columns are provided at the four corners of the top of the base plate. Cross beams are provided between the left column and the right column located at the front of the base plate, and between the left column and the right column located at the rear of the base plate. Connecting rods are provided between the two left columns and the two right columns, and four support shafts are spaced apart between the two cross beams.

[0007] The compacting device for the coarse-grained soil test block is provided with a square groove at the center position of the top of the base plate, and the lower end of the knocking box is placed in the square groove.

[0008] The compacting device for the coarse-grained soil test block is provided with handles A on the other two sides of the swing ball A, and handles B on the other two sides of the swing ball D.

[0009] The compacting device for the coarse-grained soil test block is provided with ball heads at the left end of the slide rod A and the right end of the slide rod B.

[0010] The materials of the coarse-grained soil test block compacting device, the swinging balls A, B, C and D are all made of stainless steel.

[0011] The compaction device for coarse-grained soil test blocks, the knocking box includes an upper box body and a lower box body, the thickness of the lower box body is greater than that of the upper box body, a semicircular groove A is provided at the bottom of the upper box body, and semicircular through grooves A that pass through the outside of the upper box body and are smaller than the diameter of the semicircular groove A are provided at the axial positions at both ends of the semicircular groove A, a semicircular groove B is provided at the top of the lower box body, and semicircular through grooves B that pass through the outside of the lower box body and are smaller than the diameter of the semicircular groove B are provided at the axial positions at both ends of the semicircular groove B. After the upper box body and the lower box body are buckled together, the semicircular grooves A and the semicircular grooves B form a compaction cylinder placement position, and the two semicircular through grooves A and the two semicircular through grooves B form sliding holes for the slide rods A and B to extend out of the outside of the knocking box.

[0012] The compacting device for coarse-grained soil test blocks comprises an upper box and a lower box which are hingedly connected via a hinge.

[0013] The compacting device for coarse-grained soil test blocks is provided with flanges at the edges of the bottom surfaces of both end covers, and semi-annular grooves are provided at the outer edges of both ends of the tube body, with both flanges placed in the two semi-annular grooves.

[0014] The compacting device for coarse-grained soil test blocks is characterized in that the knocking box and the compacting cylinder are both made of stainless steel.

[0015] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0016] The compacting device for coarse-grained soil test blocks described in the present invention places a knocking box in the middle of the bottom of a frame, arranges a compacting cylinder in the knocking box, and hangs two swinging balls on opposite sides of the knocking box on the frame. The four swinging balls utilize the Newton's cradle principle to knock on opposite sides of the compacting cylinder, which can not only compact the coarse-grained soil, but also simulate the influence of the resonance generated by the high-speed rail and the airport on the density of the coarse-grained soil, so that the manufactured compacts can simulate the influence of the resonance generated by the high-speed rail and the airport on the settlement of the coarse-grained soil in actual use, making the experimental data more accurate. The present invention has a reasonable structure, utilizes the transmission and feedback of the force in the Newton's cradle to form simulated displacement and resonance, has low cost, good effect, and is easy to operate, effectively solves the problems in construction, and has strong promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 Schematic diagram of the internal structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the knocking box and the compacting cylinder of the present invention;

[0020] Figure 4 This is a schematic diagram of the internal structure of the knock box of the present invention;

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the compacting cylinder of the present invention;

[0022] Figure 6 Schematic diagram of the three-dimensional structure of the frame of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of the present invention when used;

[0024] Figure 8 This is a schematic diagram of the structure of the swing ball A when the present invention is used;

[0025] Figure 9 This is a schematic diagram of the structure of the swing ball A hitting the slide bar A when the swing ball A falls when the present invention is used;

[0026] Figure 10 This is a schematic diagram of the structure of the swing ball D when the present invention is used;

[0027] Figure 11 This is a schematic structural diagram of the swing ball D hitting the slide bar B when it falls when the present invention is used.

[0028] In the figure: 1. crossbeam; 2. handle A; 3. upper box; 4. swing rod; 5. handle B; 6. column; 7. swing ball A; 8. swing ball B; 9. slide bar A; 10. lower box; 11. slide bar B; 12. swing ball C; 13. base plate; 14. swing ball D; 15. collar; 16. support shaft; 17. end cover; 18. flange; 19. semicircular groove A; 20. slider A; 21. tube body; 22. semicircular groove; 23. semicircular groove B; 24. test block; 25. slider B; 26. ball head; 27. semicircular through groove A; 28. semicircular through groove B; 29. ​​through hole; 30. tube cavity; 31. connecting rod; 32. square groove; 33. hinge. DETAILED DESCRIPTION

[0029] The present invention can be explained in more detail by the following examples. The present invention is not limited to the following examples. The purpose of the disclosure is to protect all changes and improvements within the scope of the present invention.

[0030] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0031] Combined with attachment Figures 1 to 6The compacting device for coarse-grained soil test blocks includes a frame and a knocking box, which is placed in the middle of the bottom of the frame. The frame includes a base plate 13, which is a square structure. Upward-extending columns 6 are provided at the four corners of the top of the base plate 13. A crossbeam 1 is provided between the left column 6 and the right column 6 located in the front of the base plate 13, and between the left column 6 and the right column 6 located in the rear of the base plate 13. A connecting rod 31 is provided between the two left columns 6 and the two right columns 6. Four support shafts 16 are spaced between the two crossbeams 1. A square groove 32 is provided at the center of the top of the base plate 13. The lower end of the knocking box is placed in the square groove 32. A compacting cylinder is provided in the knocking box. The compacting cylinder includes a tube body 21, and a tubular cavity 30 is provided in the tube body 21. A slider A20 is slidably connected to the left end of the tube cavity 30, a slider A9 is provided at the center of the left side of the slider A20, a slider B25 is slidably connected to the right end of the tube cavity 30, and a slider B11 is provided at the center of the right side of the slider B25. End covers 17 are covered at both ends of the tube body 21, and flanges 18 are provided at the edge of the bottom surface of each end cover 17. Semi-annular grooves 22 are provided on the outer edges of both ends of the tube body 21, and the two flanges 18 are placed in the two semi-annular grooves 22. A through-hole 29 is provided in the center of the end covers 17. The middle part of the slider A9 and the middle part of the slider B11 are slidably connected in the two through-holes 29. The left end of the slider A9 extends to the left outside of the knock box, and the right end of the slider B11 extends to the right outside of the knock box. The knock box includes an upper box The body 3 and the lower box body 10, the thickness of the lower box body 10 is greater than that of the upper box body 3, a semicircular groove A19 is provided at the bottom of the upper box body 3, and a semicircular through groove A27 that passes through the outside of the upper box body 3 and is smaller than the diameter of the semicircular groove A19 is provided at the axial position of both ends of the semicircular groove A19, a semicircular groove B23 is provided on the top of the lower box body 10, and a semicircular through groove B28 that passes through the outside of the lower box body 10 and is smaller than the diameter of the semicircular groove B23 is provided at the axial position of both ends of the semicircular groove B23. After the upper box body 3 and the lower box body 10 are buckled together, the semicircular groove A and the semicircular groove B23 form a compacting cylinder placement position, the two semicircular through grooves A27 and the two semicircular through grooves B28 form a sliding hole for the slide rod A9 and the slide rod B11 to extend out of the knocking box, and one side of the upper box body 3 and one side of the lower box body 10 are hinged by a hinge 33 Link, four parallel support shafts 16 are provided at intervals from left to right on the top of the frame, and a collar 15 is rotatably connected to the middle of each support shaft 16. One end of each of the four swing rods 4 is fixedly connected to the four collars 15. A swing ball A7 is provided at the other end of the leftmost swing rod 4, and a swing ball B8 is provided at the other end of the adjacent swing rod 4. One side of the swing ball A7 contacts one side of the swing ball B8, and the other side of the swing ball B8 contacts the left end of the slide rod A9. A swing ball D14 is provided at the other end of the rightmost swing rod 4, and a swing ball C12 is provided at the other end of the adjacent swing rod 4. One side of the swing ball C12 contacts one side of the swing ball D14, and the other side of the swing ball C12 contacts the right end of the slide rod B11.Handles A2 are located on the other sides of swing ball A7, and handles B5 are located on the other sides of swing ball D14. The straight line formed by the center of swing ball A7 connecting the center of swing ball B8 and the axis of slide bar A9 are aligned, and the straight line formed by the center of swing ball C12 connecting the center of swing ball D14 and the axis of slide bar B11 are aligned. Ball heads 26 are located at the left end of slide bar A9 and the right end of slide bar B11. Swing balls A7, B8, C12, and D14 are all made of stainless steel, as are the striking box and compacting cylinder.

[0032] When the compacting device for coarse-grained soil test blocks of the present invention is not in use, the swinging balls A7, B8, C12, and D14 are all in a vertical position due to gravity, the swinging rod 4 connected to their upper ends is in a vertical position, the lower end of the knocking box is placed in the square groove 32, the compacting cylinder is placed in the knocking box, the slide bars A9 and B11 are slightly extended out of the knocking box, one side of the swinging ball A7 contacts one side of the swinging ball B8, the other side of the swinging ball B8 contacts the left end of the slide bar A9, one side of the swinging ball C12 contacts one side of the swinging ball D14, the other side of the swinging ball C12 contacts the right end of the slide bar B11, and the sliders A20 and B25 are relatively close to each other.

[0033] When in use, open the knocking box, take out the compacting cylinder, remove the end cover 17 on one side, pull the slide bar A9 to separate the slider A20 from the tube cavity 30, load the required amount of coarse-grained soil into the tube cavity 30, then install the slider A20 and cover the end cover 17. Under the support of the coarse-grained soil, the slider A20 and the slider B25 are both located at the two ends of the tube cavity 30. Use a rope to hold the lower ends of the two swinging rods 4 on the left side to move the swinging balls A7 and B8 slightly to the left, and use a rope to hold the lower ends of the two swinging rods 4 on the right side to move the swinging balls C12 and D14 slightly to the right. Put the compacting cylinder into the knocking box, remove the two ropes, and combine with the attached Figure 7 At this time, although one side of the swing ball A7 contacts one side of the swing ball B8, and the other side of the swing ball B8 contacts the left end of the slide bar A9, the lower ends of the two swing bars 4 on the left side are tilted to the left; one side of the swing ball C12 contacts one side of the swing ball D14, and the other side of the swing ball C12 contacts the right end of the slide bar B11, and the lower ends of the two swing bars 4 on the right side are tilted to the right;

[0034] Combined with attachment Figure 8 and attached Figure 9The operator pulls the two handles A2, causing the swing ball A7 to move in an arc to the left with the leftmost support shaft 16 as the center. When the swing ball A7 reaches a certain height, the operator releases the two handles A2. Relying on the gravitational potential energy generated by the swing ball A7's own weight, the swing ball A7 moves in an arc to the right with the leftmost support shaft 16 as the center, and violently hits the swing ball B8. After receiving this potential energy, the swing ball B8 transfers the potential energy to the slide rod A9 (the setting of the ball head on the left end of the slide rod A9 enables the slide rod A9 to effectively receive the force transmitted by the swing ball B8). After receiving the transmitted force, the slide rod A9 pushes the slider As A20 moves to the right, one side of the swinging ball C12 contacts one side of the swinging ball D14, and the other side of the swinging ball C12 contacts the right end of the slide bar B11. Therefore, under the action of the deadweight of the swinging balls C12 and D14, they provide some support to the slide bar B25. Under the clamping force of the slide bars A20 and B25, the coarse-grained soil is squeezed by the moving slide bar A20. When the coarse-grained soil is squeezed to a certain limit, the unexhausted potential energy transmitted by the swinging ball A7 continues to be transferred to the slide bar B25, and then to the swinging balls C12 and D14 through the slide bar B11.

[0035] According to the principle of Newton's cradle, the swing ball D14 will slightly bounce to the right with the rightmost support shaft 16 as the center of the circle and move in an arc (because the sliders A20 and B25 consume a lot of potential energy when squeezing the coarse-grained soil). The slightly bounced swing ball D14 will generate new gravitational potential energy. Under the action of this potential energy, the swing ball D14 will move in an arc to the left with the rightmost support shaft 16 as the center of the circle. Because the bounce height is not high enough, the swing ball D14 slightly hits the swing ball C12. After receiving this potential energy, the swing ball C12 transfers the potential energy to the slider B11, and the slider B11 receives the potential energy. The force transmitted pushes slider B25 to the left. Since one side of swing ball A7 contacts one side of swing ball B8, and the other side of swing ball B8 contacts the left end of slide bar A9, the weight of swing balls A7 and B8 provides some support to slider A20. Under the clamping force of sliders A20 and B25, the coarse-grained soil is slightly squeezed by the moving slider B25. When the coarse-grained soil is squeezed to a certain limit, the unexhausted potential energy transmitted by swing ball D14 continues to be transmitted to slider A20, and then to swing balls B8 and A7 through slide bar A9.

[0036] The swinging ball A7 will transfer the remaining force back to the swinging ball D14 again, and the cycle will repeat until the potential energy is completely consumed.

[0037] Combined with attachment Figure 10 and attached Figure 11The operator pulls the two handles B5, causing the swing ball D14 to move in an arc to the right with the rightmost support shaft 16 as the center. When the swing ball D14 reaches a certain height, the operator releases the two handles B5. Relying on the gravity potential energy generated by the swing ball D14's own weight, the swing ball D14 moves in an arc to the left with the rightmost support shaft 16 as the center, and violently hits the swing ball C12. After receiving this potential energy, the swing ball C12 transfers the potential energy to the slider B11 (the setting of the ball head on the right end of the slider B11 enables the slider B11 to effectively receive the force from the swing ball C12). The slider B11 receives the The force transmitted pushes slider B25 to the left. Because one side of swing ball A7 contacts one side of swing ball B8, and the other side of swing ball B8 contacts the left end of slide bar A9, the weight of swing balls A7 and B8 provides some support to slider A20. Under the clamping force of sliders A20 and B25, the coarse-grained soil is squeezed by the moving slider B25. When the coarse-grained soil is squeezed to a certain limit, the unexhausted potential energy transmitted by swing ball D14 continues to be transmitted to slider A20, and then to swing balls B8 and A7 through slide bar A9.

[0038] According to the principle of Newton's cradle, the swinging ball A7 will move in an arc to the left with the leftmost support shaft 16 as the center (because the sliders A20 and B25 consume a lot of potential energy when squeezing the coarse-grained soil). The slightly bounced swinging ball A7 will generate new gravitational potential energy. Under the action of this potential energy, the swinging ball A7 moves in an arc to the right with the leftmost support shaft 16 as the center. Because the bounce height is not high enough, the swinging ball A7 slightly hits the swinging ball B8. After receiving this potential energy, the swinging ball B8 transfers the potential energy to the slider A9. After receiving the transmitted force, the slider A9 pushes the slider A 20 moves to the right. Since one side of the swing ball C12 contacts one side of the swing ball D14, and the other side of the swing ball C12 contacts the right end of the slide bar B11, the weight of the swing balls C12 and D14 provides some support to the slide bar B25. Under the clamping of the slide bars A20 and B25, the coarse-grained soil is slightly squeezed by the moving slide bar A20. When the coarse-grained soil is squeezed to a certain limit, the unexhausted potential energy transmitted by the swing ball A7 continues to be transmitted to the slide bar B25, and then to the swing balls C12 and D14 through the slide bar B11.

[0039] The swinging ball D14 will transfer the remaining force back to the swinging ball A7 again, and the cycle will repeat until the potential energy is completely consumed.

[0040] The operator first pulls the two handles A2, then pulls the two handles B5, then pulls the two handles A2, then pulls the two handles B5, and the operation continues in a cycle;

[0041] Since the sliders A20 and B25 consume a lot of potential energy when squeezing the coarse-grained soil, the Newton's cradle effect brought about by the first pulling of the two handles A2 is not very obvious. The coarse-grained soil moves to the right in the tube cavity 30 under the pressure of the slider A20. After the first pulling of the two handles A2, the Newton's cradle effect brought about by pulling the two handles B5 is obviously better than the first pulling. After pulling the two handles B5, the coarse-grained soil moves to the left in the tube cavity 30 under the pressure of the slider B25.

[0042] As the number of pulling increases, the coarse-grained soil is squeezed and becomes increasingly dense, and the Newton's cradle effect produced each time gradually increases. The bounce height of the swinging ball D14 caused by pulling the two handles A2 gradually increases compared to the previous pulling of the two handles A2. The bounce height of the swinging ball A7 caused by the rebound of the swinging ball D14 also gradually increases compared to the pulling of the two handles A2. The amplitude of the coarse-grained soil moving to the right after pulling the two handles A2 and the coarse-grained soil moving to the left due to the rebound of the swinging ball D14 also gradually increases compared to the previous pulling of the two handles A2. The same effect is achieved when pulling the two handles B5. After a certain number of times, the coarse-grained soil becomes more compact in the tube cavity 30, and finally a test block 24 is formed. The production of this test block 24 not only uses extrusion, but also displacement and vibration to simulate its operating conditions, so that the manufactured compact can simulate the influence of the resonance generated by the high-speed rail and the airport on the settlement of the coarse-grained soil in actual use, making the experimental data more accurate.

[0043] The parts not described in detail in this invention are prior art.

Claims

1. A compacting device for a coarse-grained soil test block, comprising a frame and a knocking box, wherein the knocking box is placed in the middle of the bottom of the frame, and a compacting cylinder is arranged in the knocking box, wherein the compacting cylinder comprises a tube body (21), wherein a tube cavity (30) is arranged in the tube body (21), a slider A (20) is slidably connected to the left end of the tube cavity (30), a slide bar A (9) is arranged at the center of the left side of the slider A (20), a slider B (25) is slidably connected to the right end of the tube cavity (30), and a slider B (25) is arranged at the center of the right side of the slider B (25). Slider B (11) is covered with end caps (17) at both ends of the tube body (21), and a through hole (29) is provided in the center of each end cap (17). The middle of the slider A (9) and the middle of the slider B (11) are slidably connected in the two through holes (29). The left end of the slider A (9) extends to the left outside of the knock box, and the right end of the slider B (11) extends to the right outside of the knock box. Four parallel support shafts (16) are provided at intervals from left to right on the top of the frame. In the middle of each support shaft (16) The four swing rods (4) are all rotatably connected with a collar (15), and one end of each of the four swing rods (4) is fixedly connected to the four collars (15). A swing ball A (7) is provided at the other end of the leftmost swing rod (4), and a swing ball B (8) is provided at the other end of the adjacent swing rod (4). One side of the swing ball A (7) contacts one side of the swing ball B (8), and the other side of the swing ball B (8) contacts the left end of the slide rod A (9). A swing ball D (14) is provided at the other end of the rightmost swing rod (4), and a swing ball D (14) is provided at the other end of the swing rod (4). The other end of the adjacent swing rod (4) is provided with a swing ball C (12), one side of the swing ball C (12) contacts one side of the swing ball D (14), and the other side of the swing ball C (12) contacts the right end of the slide bar B (11). The straight line formed by the center of the swing ball A (7) connecting the center of the swing ball B (8) and the axis of the slide bar A (9) are in the same straight line, and the straight line formed by the center of the swing ball C (12) connecting the center of the swing ball D (14) and the axis of the slide bar B (11) are in the same straight line.

2. The compacting device for coarse-grained soil test blocks according to claim 1 is characterized in that: The frame includes a base plate (13), which is a square structure. Upward-extending columns (6) are provided at the four corners of the top of the base plate (13). A crossbeam (1) is provided between the left column (6) and the right column (6) located at the front of the base plate (13), and between the left column (6) and the right column (6) located at the rear of the base plate (13). A connecting rod (31) is provided between the two left columns (6) and the two right columns (6). Four support shafts (16) are arranged between the two crossbeams (1) at intervals.

3. The compacting device for coarse-grained soil test blocks according to claim 2, characterized in that: A square groove (32) is provided at the center position of the top of the base plate (13), and the lower end of the knock box is placed in the square groove (32).

4. The compacting device for coarse-grained soil test blocks according to claim 1 is characterized in that: Handles A (2) are provided on the other two sides of the swing ball A (7), and handles B (5) are provided on the other two sides of the swing ball D (14).

5. The compacting device for coarse-grained soil test blocks according to claim 1 is characterized in that: The left end of the slide bar A (9) and the right end of the slide bar B (11) are both provided with ball heads (26).

6. The compacting device for coarse-grained soil test blocks according to claim 1, characterized in that: The swing ball A (7), the swing ball B (8), the swing ball C (12) and the swing ball D (14) are all made of stainless steel.

7. The compacting device for coarse-grained soil test blocks according to claim 1, characterized in that: The knock box comprises an upper box body (3) and a lower box body (10), wherein the thickness of the lower box body (10) is greater than that of the upper box body (3), a semicircular groove A (19) is provided at the bottom of the upper box body (3), and a semicircular through groove A (27) is provided at the axis position of both ends of the semicircular groove A (19) and passes through the outside of the upper box body (3) and is smaller than the diameter of the semicircular groove A (19), a semicircular groove B (23) is provided at the top of the lower box body (10), and a semicircular groove B (23) is provided at the axis position of both ends of the semicircular groove A (19). A semicircular through groove B (28) is provided at the axis position of both ends of the groove B (23), which passes through the outside of the lower box body (10) and is smaller than the diameter of the semicircular groove B (23). After the upper box body (3) and the lower box body (10) are buckled together, the semicircular groove A and the semicircular groove B (23) form a compacting cylinder placement position, and the two semicircular through grooves A (27) and the two semicircular through grooves B (28) form a sliding hole for the slide rod A (9) and the slide rod B (11) to extend out of the knocking box.

8. The compacting device for coarse-grained soil test blocks according to claim 7, characterized in that: One side of the upper box body (3) and one side of the lower box body (10) are hingedly connected via a hinge (33).

9. The compacting device for coarse-grained soil test blocks according to claim 1, characterized in that: A flange (18) is provided at the edge of each bottom surface of the two end covers (17), and a semi-annular groove (22) is provided at the outer edge of both ends of the tube body (21), and the two flanges (18) are both placed in the two semi-annular grooves (22).

10. The compacting device for coarse-grained soil test blocks according to claim 1, characterized in that: The knock box and compacting cylinder are made of stainless steel.

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