Roadbed soil rebound modulus testing device

Abstract

The invention belongs to the technical field of subgrade soil rebound tests, and particularly discloses a subgrade soil rebound modulus testing device which comprises a bottom plate, two supporting frames are connected to one side of the upper end of the bottom plate, a top plate is connected to the two supporting frames, a lever arm is rotationally connected to the middle of the lower end of the top plate, and a leveling block is connected to one side of the outer wall of the lever arm. And one side of the lower end of the lever arm is rotationally connected with a pressurizing plate, one side of the lower end of the lever arm is rotationally connected with a lower pressing block, and one side of the lower end of the bottom plate is connected with a pushing assembly. The functions of automatic moving and positioning of the test cylinder, automatic placement of the bearing plate and the like are realized, and the problems of positioning deviation of the test cylinder and tedious test preparation at present are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of roadbed soil rebound test, and in particular relates to a roadbed soil rebound modulus test device. Background Art

[0002] Lime-soil roadbed is a roadbed structure formed by mixing lime and soil in a certain proportion, and then going through processes such as mixing, paving, and compacting. This structure combines the firmness of lime and the stability of soil, providing a solid foundation for the road. The roadbed soil rebound test is a test method used to determine the elastic deformation characteristics of roadbed soil under load. It is mainly used to evaluate the mechanical properties and bearing capacity of roadbed soil. This test simulates the effect of actual traffic load on roadbed soil, measures the deformation recovery ability of soil during loading and unloading, and thus determines its rebound modulus. The rebound test in the roadbed soil sampling test is an important detection method in road engineering. The rebound test can directly reflect the bearing capacity and deformation resistance of the soil base by measuring the rebound modulus of the soil base under load. The rebound modulus is a key parameter in pavement design, and its value directly affects the thickness design of the pavement structure layer. The rebound test results provide a scientific basis for pavement structure design. By actually testing the rebound modulus, the thickness of each layer of the pavement and the material selection can be more accurately determined to ensure the long-term performance of the pavement. The current roadbed soil rebound modulus test device has some technical defects. During the test piece positioning process, the operator needs to visually align the test tube to the bottom of the test block. This manual positioning method is prone to positioning deviation, resulting in the inability to accurately coincide with the central axis of the test tube and the test block. In addition, the load-bearing plate needs to be manually placed into the test tube during the test preparation stage. These cumbersome operating steps not only increase the test preparation time, but also reduce the test efficiency, affecting the accuracy and repeatability of the test results. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a roadbed soil rebound modulus test device.

[0004] To achieve the above objectives, the present invention provides a roadbed soil rebound modulus test device, comprising a base plate, two support frames are connected to one side of the upper end of the base plate, the two support frames are connected to a top plate, a lever arm is rotatably connected to the middle part of the lower end of the top plate, a leveling block is connected to one side of the outer wall of the lever arm, a pressure plate is rotatably connected to one side of the lower end of the lever arm, a lower pressure block is rotatably connected to one side of the lower end of the lever arm, a propulsion assembly is connected to one side of the lower end of the base plate, a shell is connected to both sides of the upper end of the base plate, support rods are connected to both sides of the upper end of the base plate, mounting blocks are connected to the upper parts of the outer walls of the two support rods, and one end of the two mounting blocks is connected to a dial gauge body.

[0005] In the above technical scheme, further, the propulsion assembly includes a frame, the frame is connected to one side of the lower end of the base plate, a first cylinder is connected to the middle of one side of the inner wall of the frame, one end of the first cylinder is connected to a moving block, the middle of both sides of the moving block are connected to guide blocks, the two sides of the inner wall of the frame corresponding to the two guide blocks are connected to guide rails, one side of the two guide blocks are respectively located inside the two guide rails and slide, the upper end of the frame and one side of the upper end of the base plate are provided with sliding grooves, and the middle of one side of the moving block is connected to a moving assembly.

[0006] In the above technical solution, further, the upper end of the moving block is connected to a second cylinder, the upper end of the second cylinder is connected to a support plate, the support plate is located inside the slide groove, the upper end of the support plate is connected to a test cylinder, and one side of the support plate is connected to a fixed component.

[0007] In the above technical solution, further, the fixing assembly includes a fixing plate, the fixing plate is connected to one side of the support plate, the middle part of the upper end of the fixing plate is connected to a support plate, both sides of the support plate are connected to first electric telescopic rods, one end of two first electric telescopic rods are connected to clamping plates, one side of the two clamping plates are in contact with both sides of the outer wall of the test tube, a guide rod is fixedly connected to the middle part of one side of the support plate, and both ends of the guide rod respectively extend through and extend to one side of the two clamping plates.

[0008] In the above technical scheme, further, the moving component includes a push rod, the push rod is connected to the middle part of one side of the moving block, the middle part of one end of the push rod is connected to a card block, the outer wall of the card block is connected to a moving plate, the moving plate is provided with a groove corresponding to the card block, the card block is inserted into the groove, the lower part of one side of the moving plate is connected to a first block, the lower end of the first block is connected to one side of the lower end of the inner wall of the frame, and the lower end of the inner wall of the frame is connected to a second block on the side corresponding to the first block.

[0009] In the above technical solution, further, the upper end of the movable plate is connected to a slide plate, one end of the slide plate extends through one side of the frame, the lower end of the slide plate is connected to a rack plate, one side of the lower end of the rack plate is meshed with a driving gear, both ends of the driving gear are rotatably connected to both sides of the inner wall of the frame, and both sides of the outer wall of the driving gear are meshed with rack belts.

[0010] In the above technical solution, further, the frame is provided with an opening corresponding to the slide, and stabilizing blocks are connected to both sides of the inner wall of the opening. Stabilizing grooves are provided on both sides of the slide corresponding to the two stabilizing blocks. The two stabilizing blocks are respectively located in the two stabilizing grooves and slide, thereby improving the stability of the slide movement.

[0011] In the above technical solution, further, the upper ends of the two rack belts sequentially penetrate the frame and the bottom plate and extend to the inside of the two shells respectively, the upper ends of the inner walls of the two rack belts are meshed and connected with guide gears, the two ends of the two guide gears are respectively rotatably connected to the two sides of the inner walls of the two shells, and the upper part of one side of the two rack belts is connected with a supporting assembly.

[0012] In the above technical solution, further, the supporting assembly includes a slider, the number of the sliders is two, the two sliders are respectively connected to the upper part of one side of the two rack belts, one end of the two sliders respectively extends through and extends to one side of the two shells, one end of the two sliders is connected to the second electric telescopic rod, one end of the second electric telescopic rod is connected to a support block, one side of the upper end of the two support blocks is connected to a connecting plate, and a bearing plate is connected between the two connecting plates.

[0013] In the above technical solution, further, an insert block is connected to the middle of one side of the two support blocks, and slots are provided at the two connecting plates corresponding to the two insert blocks, and one end of the two insert blocks is respectively inserted into the two slots.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Through the push assembly, the test tube can automatically move to the bottom of the lower pressing block, avoiding the position error in manual operation. The guide block slides in the guide rail to ensure the smooth movement of the moving block and the support plate, preventing them from offsetting or shaking. The device realizes the automatic movement and positioning of the test tube, reducing the steps and time of manual operation. After the test is completed, the push assembly can be quickly reset to prepare for the next test, which significantly improves the test efficiency. Through the fixing assembly, the test tube is firmly clamped during the movement, avoiding tilting or deviation, improving the test accuracy, and the arc-shaped design of the clamping plate fits closely with the outer wall of the test tube, further enhancing the stability of the test tube; The moving assembly drives the supporting assembly to rise and fall smoothly through the meshing transmission of the rack plate and the driving gear, avoiding the shaking or deviation of the load-bearing plate during the movement. When the test tube is placed directly under the lower pressing block, the moving assembly automatically transports the load-bearing plate to the inside of the test tube, reducing the workload of the staff and ensuring the stability of the load-bearing plate position. The supporting assembly supports the carrier plate through the supporting block and the connecting plate to ensure that it is always in a horizontal state during the movement, avoiding tilting or deviation. The cooperation between the plug block and the slot further enhances the stability of the carrier plate during the up and down movement, preventing it from deflecting or shaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure proposed by the present invention; Figure 2 An overall cross-sectional view of the present invention; Figure 3 A schematic diagram of the installation structure of the rack belt proposed in the present invention; Figure 4 This is a schematic diagram of the installation structure of the fixing assembly proposed by the present invention; Figure 5 This is a schematic diagram of the installation structure of the slider proposed by the present invention; Figure 6 The present invention provides a schematic diagram of the installation structure of the dial gauge body; Figure 7 The present invention proposes Figure 2 Schematic diagram of the enlarged structure of A; Figure 8 This is a schematic diagram of the installation structure of the load-bearing plate proposed by the present invention; Fig. 9 This is a schematic diagram of the installation structure of the plug block proposed in the present invention.

[0016] In the figure: 1, bottom plate; 2, support frame; 3, top plate; 4, lever arm; 5, leveling block; 6, pressure plate; 7, lower pressure block; 8, frame; 9, first cylinder; 10, moving block; 11, slideway; 12, second cylinder; 13, support plate; 14, test tube; 15, fixed plate; 16, support plate; 17, first electric telescopic rod; 18, clamping plate; 19, guide rod; 20, push rod; 21, clamping block; 22 , moving plate; 23, groove; 24, first stopper; 25, second stopper; 26, slide plate; 27, rack plate; 28, driving gear; 29, rack belt; 30, housing; 31, guide gear; 32, slider; 33, second electric telescopic rod; 34, support block; 35, connecting plate; 36, bearing plate; 37, plug-in block; 38, slot; 39, support rod; 40, mounting block; 41, dial gauge body. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1-Figure 9 A roadbed soil rebound modulus test device shown in the figure comprises a bottom plate 1, two support frames 2 are connected to one side of the upper end of the bottom plate 1, the two support frames 2 are connected to a top plate 3, a lever arm 4 is rotatably connected to the middle of the lower end of the top plate 3, a leveling block 5 is connected to one side of the outer wall of the lever arm 4, a pressure plate 6 is rotatably connected to one side of the lower end of the lever arm 4, a lower pressure block 7 is rotatably connected to one side of the lower end of the lever arm 4, a propulsion assembly is connected to one side of the lower end of the bottom plate 1, both sides of the upper end of the bottom plate 1 are connected to a shell 30, both sides of the upper end of the bottom plate 1 are connected to support rods 39, the upper parts of the outer walls of the two support rods 39 are connected to mounting blocks 40, and one end of the two mounting blocks 40 are connected to a dial gauge body 41; The propulsion assembly includes a frame 8, which is connected to one side of the lower end of the bottom plate 1, a first cylinder 9 is connected to the middle of one side of the inner wall of the frame 8, one end of the first cylinder 9 is connected to a moving block 10, and the middle of both sides of the moving block 10 are connected to guide blocks, and the two sides of the inner wall of the frame 8 corresponding to the two guide blocks are connected to guide rails, and one side of the two guide blocks is respectively located inside the two guide rails for sliding, and the upper end of the frame 8 and the upper end of the bottom plate 1 are provided with a slide groove 11, and the middle of one side of the moving block 10 is connected to a moving assembly, and the upper end of the moving block 10 is connected to a second cylinder 12, and the upper end of the second cylinder 12 is connected to a support plate 13, the support plate 13 is located inside the slide groove 11, and the upper end of the support plate 13 is connected to a test cylinder 14, and one side of the support plate 13 is connected to a fixed assembly; The fixing assembly includes a fixing plate 15, the fixing plate 15 is connected to one side of the support plate 13, a support plate 16 is connected to the middle of the upper end of the fixing plate 15, first electric telescopic rods 17 are connected to both sides of the support plate 16, one end of two first electric telescopic rods 17 are connected to clamping plates 18, one side of the two clamping plates 18 is in contact with both sides of the outer wall of the test tube 14, a guide rod 19 is fixedly connected to the middle of one side of the support plate 16, and both ends of the guide rod 19 extend through and extend to one side of the two clamping plates 18 respectively; The test tube 14 containing the roadbed soil sample is placed above the support plate 13. At this time, the support plate 13 is higher than the base plate 1. The test tube 14 is fixed by a fixing assembly. Then, the moving block 10 is pushed to move toward the side of the moving plate 22 by the first cylinder 9, and then the support plate 13 slides inside the slide groove 11, driving the test tube 14 to move. When the support plate 13 moves to one end of the slide groove 11, the test tube 14 is directly below the lower pressing block 7, and the support plate 13 is driven downward by the second cylinder 12, so that the test tube 14 can be placed above the base plate 1.

[0019] When the test tube 14 is placed on the support plate 13, the two first electric telescopic rods 17 drive the clamping plates 18 to move toward the two sides of the test tube 14, so that the two clamping plates 18 clamp the two sides of the test tube 14. The clamping plates 18 are arranged in an arc-shaped structure corresponding to one side of the test tube 14, so as to ensure that the test tube 14 is located directly above the support plate 13. At the same time, the two clamping plates 18 can ensure the stability of the test tube 14 when it moves. The arc-shaped structure design of the clamping plates 18 enables it to fit tightly against the outer wall of the test tube 14, ensuring that the test tube 14 will not deviate or shake during the movement.

[0020] The moving assembly includes a push rod 20, which is connected to the middle part of one side of the moving block 10, a block 21 is connected to the middle part of one end of the push rod 20, a moving plate 22 is connected to the outer wall of the block 21, a groove 23 is provided at the moving plate 22 corresponding to the block 21, the block 21 is inserted into the groove 23, a first block 24 is connected to the lower part of one side of the moving plate 22, the lower end of the first block 24 is connected to one side of the lower end of the inner wall of the frame 8, a second block 25 is connected to the side of the lower end of the inner wall of the frame 8 corresponding to the first block 24, a slide plate 26 is connected to the upper end of the moving plate 22, one end of the slide plate 26 extends through to one side of the frame 8, a rack plate 27 is connected to the lower end of the slide plate 26, and a driving gear 28 is meshed and connected to the lower end of the rack plate 27. The two ends of 28 are rotatably connected with the two sides of the inner wall of the frame 8, and the two sides of the outer wall of the driving gear 28 are meshed with rack belts 29. The frame 8 is provided with an opening corresponding to the slide plate 26, and the two sides of the inner wall of the opening are connected with stabilizing blocks. Stabilizing grooves are provided at the two sides of the slide plate 26 corresponding to the two stabilizing blocks. The two stabilizing blocks are respectively located in the two stabilizing grooves and slide, and the stability of the movement of the slide plate 26 is improved. The upper ends of the two rack belts 29 pass through the frame 8 and the bottom plate 1 in sequence and extend to the inside of the two shells 30 respectively. The upper ends of the inner walls of the two rack belts 29 are meshed with guide gears 31. The two ends of the two guide gears 31 are respectively rotatably connected with the two sides of the inner walls of the two shells 30, and the upper part of one side of the two rack belts 29 is connected with a supporting assembly. The cooperation of the stabilizing block and the stabilizing groove ensures the stability of the slide plate 26 during the movement and prevents it from deflecting. When the propulsion assembly pushes the test tube 14 to move to the side of the moving plate 22, the push rod 20 and the block 21 on one side of the moving block 10 push the moving plate 22, and the moving plate 22 drives the slide plate 26 and the rack plate 27 to move to one side. When the rack plate 27 moves to one side, it drives the driving gear 28 to rotate counterclockwise. When the driving gear 28 rotates, it can drive the two rack belts 29 to transmit counterclockwise. The guide gears 31 on the upper ends of the inner walls of the two rack belts 29 rotate in meshing with them. The guide gears 31 are used to guide the rack belts 29. The transmission direction ensures the smooth lifting of the supporting assembly. When the rack belt 29 is driven, the supporting assembly on one side thereof is driven to move upward, and then the carrying plate 36 can be driven to move upward. When the moving plate 22 moves to the side of the first stopper 24, the first stopper 24 blocks the position of the moving plate 22, and the pushing assembly continues to move toward the side of the moving plate 22, thereby driving the push rod 20 and the card block 21 to continue to move toward the side of the moving plate 22. The card block 21 is made of a material with a certain elasticity, and can provide sufficient rigidity when pushing the moving plate 22. The card block 21 is connected to the inside of the groove 23, and the pushing assembly stops moving at this time. When the test cylinder 14 is placed on the bottom plate 1, the propulsion assembly is reset, and the moving block 10 moves toward the side of the first cylinder 9. Since the block 21 has been clamped into the groove 23, the moving plate 22 is driven to move when the moving block 10 moves toward the side of the first cylinder 9, and the driving gear 28 rotates clockwise, thereby driving the two rack belts 29 to transmit clockwise. When the rack belt 29 transmits clockwise, it drives the supporting assembly to move downward, and the lower part of the bearing plate 36 can be placed into the test cylinder 14. The lower part of the bearing plate 36 contacts the upper surface of the roadbed soil inside the test cylinder 14. At this time, the moving plate 22 moves to the side of the second stopper 25, and the second stopper 25 blocks the moving plate 22, while the propulsion assembly continues to move toward the side of the first cylinder 9, and then the block 21 moves out of the groove 23, and the block 21 and the push rod 20 continue to move with the moving block 10, and the block 21 and the push rod 20 are away from the moving plate 22.

[0021] The holding assembly includes a slider 32, the number of which is two. The two sliders 32 are respectively connected to the upper part of one side of the two rack belts 29, one end of the two sliders 32 respectively extends through the two sides of the housings 30, one end of the two sliders 32 is connected to the second electric telescopic rod 33, one end of the second electric telescopic rod 33 is connected to a support block 34, one side of the upper end of the two support blocks 34 is connected to a connecting plate 35, a bearing plate 36 is connected between the two connecting plates 35, an insert block 37 is connected to the middle part of one side of the two support blocks 34, and slots 38 are provided at the two connecting plates 35 corresponding to the two insert blocks 37, and one end of the two insert blocks 37 is respectively inserted into the inside of the two slots 38; The cooperation between the plug block 37 and the slot 38 ensures the stability of the load-bearing plate 36 during the up and down movement, and prevents it from shifting or shaking. By placing the two connecting plates 35 above the support block 34, the load-bearing plate 36 is supported by the two support blocks 34, and the two plug blocks 37 on one side of the support block 34 are respectively plugged into the slots 38 on one side of the two connecting plates 35, so as to improve the stability of the load-bearing plate 36 when it moves up and down. When the lower side of the load-bearing plate 36 contacts the upper surface of the roadbed soil inside the test tube 14, the two second electric telescopic rods 33 drive the two support blocks 34 to move toward the side of the shell 30, and the two plug blocks 37 follow the support blocks 34 to move toward the side of the shell 30. The plug blocks 37 are moved out of the slots 38 for subsequent testing. After the support block 34 moves toward the shell 30, the plug blocks 37 are disengaged from the slots 38, so that the load-bearing plate 36 can be pressed down freely, thereby ensuring the accuracy of the test.

[0022] When it is necessary to perform a rebound test on the roadbed soil, first place the sampled roadbed soil inside the test tube 14, and place the test tube 14 above the propulsion assembly. The propulsion assembly can automatically place the test tube 14 directly below the lower pressure block 7 to ensure the accuracy of the position of the test tube 14, and fix the test tube 14 above the propulsion assembly through the fixing assembly to ensure that the test tube 14 is displaced in the middle of the upper end of the propulsion assembly, while improving the stability of the test tube 14 when moving. The test tube 14 containing the roadbed soil is moved to directly below the lower pressure block 7 by the propulsion assembly, and then the fixing assembly releases the fixation of the test tube 14, and the second cylinder 12 drives the test tube 14 downward so that the bottom of the test tube 14 contacts the bottom plate 1, and while the propulsion assembly moves to one side, the moving assembly can drive the supporting assembly and the bearing plate 36 to move upward, so that when the test tube 14 moves to below the lower pressure block 7, the bearing plate can be pushed 36 moves upward to facilitate the placement of the test cylinder 14. When the propulsion assembly pushes the test cylinder 14 to the appropriate position, the propulsion assembly is reset, driving the bearing plate 36 to move downward, and then the bottom of the bearing plate 36 contacts the roadbed soil inside the test cylinder 14. When the bearing plate 36 contacts the roadbed soil, the supporting assembly is away from the bearing plate 36. The staff manually adjusts the micrometer body 41 on both sides so that the detection head below the micrometer body 41 contacts the top of the two connecting plates 35 respectively. The micrometer body 41 is used to measure the downward displacement of the bearing plate 36 to ensure the accuracy of the test. According to the expected rebound modulus of the roadbed soil, weights of appropriate weight are selected and stacked on the pressure plate 6, and then the lever arm 4 at one end of the pressure plate 6 tilts downward, driving the downward pressing block 7 to press the bearing plate 36 downward to apply pressure to the roadbed soil inside the test cylinder 14, and perform a rebound test on the roadbed soil in the test cylinder 14.

[0023] Working principle: When using the device, place the test tube 14 containing the roadbed soil sample on the support plate 13 of the propulsion assembly, and the first electric telescopic rod 17 pushes the clamping plate 18 to move to both sides of the test tube 14. The arc-shaped structure of the clamping plate 18 fits tightly against the outer wall of the test tube 14 to ensure that the test tube 14 will not deviate or shake during the movement. The first cylinder 9 pushes the moving block 10 to move to the side of the moving plate 22, driving the support plate 13 to slide in the slide groove 11. When the test tube 14 reaches the specified position, the second cylinder 12 pushes the support plate 13 downward to make the test tube 14 contact with the bottom plate 1. The fixing assembly releases the fixation of the test tube 14, and the test tube 14 is stably placed on the bottom plate 1 to ensure its accurate position. When the propulsion assembly pushes the test tube 14 to move toward one side of the housing 30, the push rod 20 and the block 21 push the moving plate 22 to move, driving the slide plate 26 and the rack plate 27 to move, and the rack plate 27 drives the driving gear 28 to rotate counterclockwise, and the driving gear 28 drives the supporting assembly to move upward through the rack belt 29, and lifts the carrying plate 36 to the top of the test tube 14. When the moving plate 22 moves to the position of the first stopper 24, the first stopper 24 blocks the moving plate 22 to stop it from moving. At this time, the propulsion assembly continues to move, but because the block 21 has been inserted into the groove 23, the elastic material of the block 21 enables it to withstand the thrust and maintain connection with the groove 23; When the test cylinder 14 is placed in place, the propulsion assembly is reset. Since the block 21 is still inserted into the groove 23, the moving block 10 pulls the moving plate 22 to move toward the first cylinder 9 side through the push rod 20 and the block 21. The moving plate 22 drives the slide plate 26 and the rack plate 27 to move. The rack plate 27 drives the gear 28 to rotate clockwise, thereby driving the rack belt 29 and the supporting assembly to move downward. When the moving plate 22 moves to the position of the second stopper 25, the second stopper 25 blocks the moving plate 22 to stop it from moving. At this time, the propulsion assembly continues to move toward the first cylinder 9 side, the block 21 disengages from the groove 23, and the push rod 20 and the block 21 continue to move with the moving block 10 to complete the reset. Weights of appropriate weight are stacked on the pressure plate 6. The weight of the weights is selected according to the expected rebound modulus of the roadbed soil. The weight of the weights causes the lever arm 4 at one end of the pressure plate 6 to tilt downward, driving the downward pressure block 7 to press the bearing plate 36 downward. The bearing plate 36 applies pressure to the roadbed soil inside the test tube 14 to simulate the actual pressure conditions. The downward displacement of the bearing plate 36 is measured by the micrometer body 41. The detection head of the micrometer body 41 is in contact with the connecting plate 35 to monitor the displacement change of the bearing plate 36 in real time. According to the measurement results, the rebound modulus of the roadbed soil is calculated to evaluate its rebound performance.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A roadbed soil rebound modulus test device, comprising a base plate (1), characterized in that: One side of the upper end of the bottom plate (1) is connected to two support frames (2), the two support frames (2) are connected to a top plate (3), the middle part of the lower end of the top plate (3) is rotatably connected to a lever arm (4), one side of the outer wall of the lever arm (4) is connected to a leveling block (5), one side of the lower end of the lever arm (4) is rotatably connected to a pressure plate (6), one side of the lower end of the lever arm (4) is rotatably connected to a lower pressure block (7), one side of the lower end of the bottom plate (1) is connected to a propulsion assembly, both sides of the upper end of the bottom plate (1) are connected to a shell (30), both sides of the upper end of the bottom plate (1) are connected to support rods (39), the upper parts of the outer walls of the two support rods (39) are connected to mounting blocks (40), and one end of the two mounting blocks (40) is connected to a dial gauge body (41).

2. A roadbed soil rebound modulus test device according to claim 1, characterized in that: The propulsion assembly comprises a frame (8), the frame (8) being connected to one side of the lower end of the base plate (1), a first cylinder (9) being connected to the middle of one side of the inner wall of the frame (8), one end of the first cylinder (9) being connected to a moving block (10), the middle of both sides of the moving block (10) being connected to guide blocks, guide rails being connected to two sides of the inner wall of the frame (8) corresponding to the two guide blocks, one side of the two guide blocks being respectively located inside the two guide rails for sliding, a sliding groove (11) being provided at the upper end of the frame (8) and one side of the upper end of the base plate (1), and a moving assembly being connected to the middle of one side of the moving block (10).

3. A roadbed soil rebound modulus test device according to claim 2, characterized in that: The upper end of the moving block (10) is connected to a second cylinder (12), the upper end of the second cylinder (12) is connected to a support plate (13), the support plate (13) is located inside the slide groove (11), the upper end of the support plate (13) is connected to a test cylinder (14), and one side of the support plate (13) is connected to a fixing component.

4. A roadbed soil rebound modulus test device according to claim 3, characterized in that: The fixing assembly comprises a fixing plate (15), the fixing plate (15) being connected to one side of the support plate (13), a support plate (16) being connected to the middle of the upper end of the fixing plate (15), first electric telescopic rods (17) being connected to both sides of the support plate (16), one end of two first electric telescopic rods (17) being connected to clamping plates (18), one side of the two clamping plates (18) being in contact with both sides of the outer wall of the test tube (14), a guide rod (19) being fixedly connected to the middle of one side of the support plate (16), and both ends of the guide rod (19) respectively extending through one side of the two clamping plates (18).

5. A roadbed soil rebound modulus test device according to claim 2, characterized in that: The moving assembly comprises a push rod (20), the push rod (20) being connected to the middle of one side of the moving block (10), a clamping block (21) being connected to the middle of one end of the push rod (20), a moving plate (22) being connected to the outer wall of the clamping block (21), a groove (23) being provided on the moving plate (22) corresponding to the clamping block (21), the clamping block (21) being plugged into the groove (23), a first block (24) being connected to the lower part of one side of the moving plate (22), a lower end of the first block (24) being connected to one side of the lower end of the inner wall of the frame (8), and a second block (25) being connected to the lower end of the inner wall of the frame (8) corresponding to the first block (24).

6. A roadbed soil rebound modulus test device according to claim 5, characterized in that: The upper end of the movable plate (22) is connected to a slide plate (26), one end of the slide plate (26) extends through one side of the frame (8), the lower end of the slide plate (26) is connected to a rack plate (27), one side of the lower end of the rack plate (27) is meshingly connected to a driving gear (28), both ends of the driving gear (28) are rotatably connected to both sides of the inner wall of the frame (8), and both sides of the outer wall of the driving gear (28) are meshingly connected to rack belts (29).

7. A roadbed soil rebound modulus test device according to claim 6, characterized in that: The frame (8) is provided with an opening at a position corresponding to the slide plate (26), and stabilizing blocks are connected to both sides of the inner wall of the opening. Stabilizing grooves are provided at both sides of the slide plate (26) corresponding to the two stabilizing blocks. The two stabilizing blocks are respectively located in the two stabilizing grooves for sliding, and the stability of the movement of the slide plate (26) is improved.

8. A roadbed soil rebound modulus test device according to claim 6, characterized in that: The upper ends of the two rack belts (29) sequentially penetrate the frame (8) and the bottom plate (1) and extend into the interior of the two shells (30) respectively; the upper ends of the inner walls of the two rack belts (29) are meshedly connected with guide gears (31); the two ends of the two guide gears (31) are rotatably connected to the inner walls of the two shells (30) respectively; and the upper part of one side of the two rack belts (29) is connected to a supporting assembly.

9. A roadbed soil rebound modulus test device according to claim 8, characterized in that: The supporting assembly comprises a slider (32), the number of the sliders (32) being two, the two sliders (32) being respectively connected to the upper part of one side of two rack belts (29), one end of the two sliders (32) respectively extending through one side of two housings (30), one end of the two sliders (32) being connected to a second electric telescopic rod (33), one end of the second electric telescopic rod (33) being connected to a support block (34), one side of the upper end of the two support blocks (34) being connected to a connecting plate (35), and a bearing plate (36) being connected between the two connecting plates (35).

10. A roadbed soil rebound modulus test device according to claim 9, characterized in that: An insert block (37) is connected to the middle of one side of the two support blocks (34), and slots (38) are provided on the two connection plates (35) corresponding to the two insert blocks (37). One end of the two insert blocks (37) is respectively inserted into the two slots (38).

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