A sampling device for road subgrade detection

Abstract

The present invention discloses a sampling device for road subgrade detection, including a support plate assembly, rollers, a sample box, a controller assembly, and a sampling device. By providing the sampling device, a movable cover device is provided at the bottom of the sampling cylinder of the sampling device. A movable cover is placed inside the U-shaped frame of the movable cover device. After the sampling cylinder takes a sample, the movable cover is controlled to close to cover the bottom of the sampling cylinder, preventing the sample inside the sampling cylinder from easily falling off, ensuring that the sample inside the sampling cylinder does not fall during the process of moving the sampling cylinder to the sample box, and the movable cover device does not affect the sampling movement of the sampling cylinder. By providing the support plate assembly, the support plate assembly is used to support, limit, and control the movement of the sampling device, and multiple sample boxes are placed on the support plate assembly for separately storing road subgrade samples at different positions.

Description

Technical Field

[0001] The present invention relates to the field related to road detection, and specifically to a sampling device for road subgrade detection. Background Art

[0002] China's national strength has been significantly improved, and at the same time, people's living standards have also been improved. Therefore, people have put forward higher requirements in many aspects, and there are also new requirements for the quality of transportation in the process of urban development. In the process of continuous urban construction, in order to better promote economic development and meet people's needs, the number of urban municipal roads under construction is increasing continuously. In municipal road engineering, the test and detection work of municipal roads is an important link in the quality assessment and acceptance of municipal roads, and it also plays a great role in reducing construction costs and accelerating the project progress.

[0003] Existing road detection tests require the detection of road foundations, and drilling sampling equipment is often used for sampling. At present, the Chinese patent with the publication number CN110904941B discloses "A Sampling Structure for Road Subgrade Detection". The sampling structure for road subgrade detection includes a towing seat installed on a detection vehicle through a locking device, a detection device installed on the towing seat and used for detecting road cracks, a pair of sampling devices installed on the towing seat and used for collecting subgrade samples, and a pair of storage frames installed on the towing seat. The detection device includes an adjustment component for adjusting the detection range and a collection component installed on the adjustment component and used for collecting road crack data; the sampling device includes a driving component, a picking component installed on the driving component and used for sampling, and a discharging component installed on the towing seat and used for placing samples. The present invention overcomes the deficiencies of the prior art and provides a sampling structure and sampling method specifically for road subgrade detection, which solves the problems of small sample quantity and single structural function of existing sampling equipment.

[0004] For the above-mentioned sampling structure for road subgrade detection, the road subgrade is sampled by using a sampling cylinder. However, after the sampling cylinder samples the road subgrade, since the bottom of the sampling cylinder is hollowed out, the samples inside the sampling cylinder are likely to fall off before the sampling cylinder moves to the discharging area. Summary of the Invention

[0005] Therefore, in order to solve the above deficiencies, the present invention hereby provides a sampling device for road subgrade detection.

[0006] The present invention is implemented as follows: A sampling device for roadbed detection is constructed. The device includes a support plate assembly and a sampling device. The support plate assembly is used to support the sampling device and control its movement. Rollers are installed at the bottom of the support plate assembly. A sample box is provided on the right side of the middle of the top end of the support plate assembly. A controller assembly is fixed at the rear side of the top of the support plate assembly. The sampling device is installed on the top of the support plate assembly and is used to sample the roadbed.

[0007] Preferably, the support plate assembly includes a support plate, a connecting frame, a sampling through hole, a sample box placement groove, a slide rail, a support block, a first motor, a screw rod, and a movable plate. A connecting frame is fixed to the right end of the support plate. A sampling through hole is opened on the left side inside the support plate. A sample box placement groove is opened on the right side of the top end of the support plate. A slide rail is horizontally fixed to the top surface of the support plate. Support blocks are respectively fixed to the left and right ends of the front side of the top of the support plate, and a screw rod is arranged between the two support blocks. The screw rod is in transmission connection with the output shaft of the first motor. The screw rod horizontally penetrates the movable plate, and the inner wall of the movable plate is threadedly connected to the screw rod. The rear side of the movable plate is fixedly connected to the sampling device, and the bottom of the sampling device slides along the slide rail.

[0008] Preferably, the sampling device includes a top plate, a light rod, a slider, a movable cross plate, an electric push rod, a second motor, a sampling cylinder, and a movable cover plate device. Light rods are fixed to the bottom corners of the top plate. There are two sliders, and the two sliders are respectively fixed to the bottom ends of the front and rear light rods. The light rods vertically penetrate the inner corners of the movable cross plate. A second motor is fixed to the middle of the top end of the movable cross plate. A sampling cylinder is arranged in the middle of the bottom end of the movable cross plate, and the output shaft of the second motor at the bottom end is connected to the sampling cylinder. A movable cover plate device is arranged at the bottom end of the sampling cylinder, and the top end of the movable cover plate device is connected to the movable cross plate. The slider is sleeved outside the slide rail, and the slider slides horizontally along the outer wall of the slide rail. The slider is fixedly connected to the movable plate.

[0009] Preferably, the movable cover plate device includes a cover plate assembly, a support plate, a first limiting rod, a first spring, and a limiting ring. Support plates are fixed to the front and rear sides of the cover plate assembly. A first limiting rod is fixed to the top end of the support plate. A first spring is sleeved outside the first limiting rod. The top end of the first limiting rod penetrates the movable cross plate and is fixedly connected to the limiting ring, and the top of the support plate is elastically connected to the movable cross plate through the first spring. The cover plate assembly is arranged at the bottom of the sampling cylinder.

[0010] Preferably, the cover plate assembly includes a U-shaped frame, a chute, a movable cover plate, a convex block, a magnetic block, a second limiting rod, a second spring and an electromagnet. Chutes are provided on both the front and rear sides inside the U-shaped frame. A movable cover plate is inserted into the right side inside the U-shaped frame. Convex blocks are provided on the left sides of the front and rear ends of the movable cover plate, and the convex blocks are integrally formed with the movable cover plate. A magnetic block is embedded in the right side inside the convex block. The convex block is embedded into the chute. A second limiting rod is horizontally fixed inside the chute, and the second limiting rod horizontally penetrates through the convex block and the magnetic block. The right side of the magnetic block is elastically connected to the right inner wall of the chute through the second spring, and the second spring is sleeved outside the second limiting rod. Electromagnets are installed on the right sides of the front and rear ends inside the U-shaped frame. Both the front and rear sides of the U-shaped frame are fixedly connected to the support plate.

[0011] Preferably, the inner diameter of the sampling through hole is larger than the outer diameter of the sampling cylinder, and the sampling through hole and the sample box are arranged in the same horizontal straight line.

[0012] Preferably, there are two slide rails. The two slide rails are arranged parallel to the screw rod, the surface of the slide rail is smooth, and the inner wall of the slider fits with the slide rail.

[0013] Preferably, there are four first limiting rods. The four first limiting rods are all arranged vertically, and the inner wall of the movable cross plate fits with the first limiting rods.

[0014] Preferably, the length and width inside the U-shaped frame are both larger than the outer diameter of the sampling cylinder, and the inner wall of the U-shaped frame fits with the movable cover plate.

[0015] Preferably, the outer wall of the convex block fits with the inner wall of the chute, and the inner walls of the convex block and the magnetic block both fit with the second limiting rod.

[0016] The present invention has the following advantages: The present invention provides a sampling device for road subgrade detection by improvement. Compared with the same type of devices, the following improvements are made:

[0017] For the sampling device for road subgrade detection of the present invention, by providing a sampling device, a movable cover plate device is provided at the bottom of the sampling cylinder of the sampling device. A movable cover plate is arranged inside the U-shaped frame of the movable cover plate device. After the sampling cylinder samples, the movable cover plate is controlled to close to seal the bottom of the sampling cylinder, avoiding the easy dropping of the internal sample in the sampling cylinder, ensuring that the internal sample in the sampling cylinder will not drop during the process of moving the sampling cylinder to the sample box, and the movable cover plate device does not affect the sampling movement of the sampling cylinder.

[0018] For the sampling device for road subgrade detection of the present invention, by providing a support plate assembly, the sampling device is supported, limited and its movement is controlled through the support plate assembly, and multiple sample boxes are placed on the support plate assembly for respectively storing road subgrade samples at different positions. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural view of the present invention;

[0020] Figure 2 is a schematic structural view of the support plate assembly of the present invention;

[0021] Figure 3 is a schematic structural view of the sampling device of the present invention;

[0022] Figure 4 is a left view of the sampling device of the present invention;

[0023] Figure 5 is a schematic structural view of the movable cover plate device of the present invention;

[0024] Figure 6 is a schematic structural view of the cover plate assembly of the present invention;

[0025] Figure 7 is the present invention Figure 6 partial enlarged view of area A;

[0026] Figure 8 is a top sectional view of the internal structure of the cover plate assembly of the present invention.

[0027] Among them: support plate assembly - 1, roller - 2, sample box - 3, controller assembly - 4, sampling device - 5, support plate - 11, connecting frame - 12, sampling through - hole - 13, sample box placement groove - 14, slide rail - 15, support block - 16, first motor - 17, screw - 18, movable plate - 19, top plate - 51, smooth rod - 52, slider - 53, movable cross - plate - 54, electric push rod - 55, second motor - 56, sampling cylinder - 57, movable cover plate device - 58, cover plate assembly - 581, support plate - 582, first limit rod - 583, first spring - 584, limit ring - 585, U - shaped frame - 5811, chute - 5812, movable cover plate - 5813, convex block - 5814, magnetic block - 5815, second limit rod - 5816, second spring - 5817, electromagnet - 5818. Detailed Description of the Invention

[0028] The following will combine the attached Figures 1-8 to describe the present invention in detail. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] Please refer to Figure 1, a sampling device for road subgrade detection according to the present invention, comprising a support plate assembly 1 and a sampling device 5. The support plate assembly 1 is used for supporting and moving control of the sampling device 5. A roller 2 is installed at the bottom of the support plate assembly 1. A sample box 3 is arranged on the right side of the middle of the top of the support plate assembly 1. A controller assembly 4 is fixed at the rear of the top of the support plate assembly 1. The sampling device 5 is installed on the top of the support plate assembly 1, and the sampling device 5 is used for sampling the road subgrade.

[0030] Please refer to Figure 2 , a sampling device for road subgrade detection according to the present invention, the support plate assembly 1 includes a support plate 11, a connecting frame 12, a sampling through hole 13, a sample box placement groove 14, a slide rail 15, a support block 16, a first motor 17, a screw 18 and a movable plate 19. A connecting frame 12 is fixed at the right end of the support plate 11. A sampling through hole 13 is opened on the left side inside the support plate 11. A sample box placement groove 14 is opened on the right side of the top of the support plate 11. A slide rail 15 is horizontally fixed on the top surface of the support plate 11. Support blocks 16 are respectively fixed at the left and right ends of the front side of the top of the support plate 11, and a screw 18 is arranged between the two support blocks 16. The screw 18 is in transmission connection with the output shaft of the first motor 17. The screw 18 horizontally penetrates through the movable plate 19, and the inner wall of the movable plate 19 is threadedly connected with the screw 18. The rear side of the movable plate 19 is fixedly connected with the sampling device 5. The bottom of the sampling device 5 slides along the slide rail 15. The inner diameter of the sampling through hole 13 is larger than the outer diameter of the sampling cylinder 57, and the sampling through hole 13 and the sample box 3 are arranged in the same horizontal straight line, so that the sampling cylinder 57 samples the road subgrade through the sampling through hole 13, and the sampling cylinder 57 is horizontally moved to the top of the sample box 3 to place the sample in the sample box 3. There are two slide rails 15, and the two slide rails 15 are parallel to the screw 18, and the surface of the slide rail 15 is smooth. The inner wall of the slider 53 fits with the slide rail 15. The screw 18 drives the movable plate 19 to move horizontally, and the movable plate 19 drives the slider 53 to move horizontally along the slide rail 15.

[0031] Please refer to Figures 3-4, a sampling device for road subgrade detection according to the present invention, the sampling device 5 includes a top plate 51, a light rod 52, a slider 53, a movable transverse plate 54, an electric push rod 55, a second motor 56, a sampling cylinder 57 and a movable cover plate device 58. Light rods 52 are fixed at the bottom corners of the top plate 51. There are two sliders 53, and the two sliders 53 are respectively fixed at the bottom ends of the front and rear light rods 52. The light rods 52 vertically penetrate through the inner corners of the movable transverse plate 54. The middle part of the top end of the movable transverse plate 54 is fixed with a second motor 56. The middle part of the bottom end of the movable transverse plate 54 is provided with a sampling cylinder 57, and the output shaft at the bottom end of the second motor 56 is connected to the sampling cylinder 57. A movable cover plate device 58 is arranged at the bottom end of the sampling cylinder 57, and the top end of the movable cover plate device 58 is connected to the movable transverse plate 54. The slider 53 is sleeved outside the slide rail 15, and the slider 53 slides horizontally along the outer wall of the slide rail 15. The slider 53 is fixedly connected to the movable plate 19.

[0032] Please refer to Figure 5 , a sampling device for road subgrade detection according to the present invention, the movable cover plate device 58 includes a cover plate assembly 581, a support plate 582, a first limiting rod 583, a first spring 584 and a limiting ring 585. Support plates 582 are fixed on both the front and rear sides of the cover plate assembly 581. A first limiting rod 583 is fixed at the top end of the support plate 582. A first spring 584 is sleeved outside the first limiting rod 583. The top end of the first limiting rod 583 penetrates through the movable transverse plate 54 and is fixedly connected to the limiting ring 585. And the top of the support plate 582 is elastically connected to the movable transverse plate 54 through the first spring 584. The cover plate assembly 581 is arranged at the bottom of the sampling cylinder 57. There are four first limiting rods 583. The four first limiting rods 583 are all vertically arranged, and the inner wall of the movable transverse plate 54 is in contact with the first limiting rod 583 to limit the movement track of the first limiting rod 583 and prevent the cover plate assembly 581 from shifting to block the movement of the sampling cylinder 57.

[0033] Please refer to Figures 6-8, A sampling device for road subgrade detection according to the present invention, the cover plate assembly 581 includes a U-shaped frame 5811, a chute 5812, a movable cover plate 5813, a convex block 5814, a magnetic block 5815, a second limiting rod 5816, a second spring 5817 and an electromagnet 5818. Chutes 5812 are provided on both the front and rear sides inside the U-shaped frame 5811. A movable cover plate 5813 is inserted into the right side inside the U-shaped frame 5811. On the left sides of the front and rear ends of the movable cover plate 5813, convex blocks 5814 are provided, and the convex blocks 5814 are integrally formed with the movable cover plate 5813. A magnetic block 5815 is embedded on the right side inside the convex block 5814. The convex block 5814 is embedded into the chute 5812. A second limiting rod 5816 is horizontally fixed inside the chute 5812, and the second limiting rod 5816 horizontally penetrates through the convex block 5814 and the magnetic block 5815. The right side of the magnetic block 5815 is elastically connected to the inner right side wall of the chute 5812 through a second spring 5817, and the second spring 5817 is sleeved outside the second limiting rod 5816. Electromagnets 5818 are installed on the right sides of the front and rear ends inside the U-shaped frame 5811. The front and rear sides of the U-shaped frame 5811 are fixedly connected to the support plate 582. The length and width inside the U-shaped frame 5811 are both larger than the outer diameter of the sampling cylinder 57, and the inner wall of the U-shaped frame 5811 is in contact with the movable cover plate 5813. After the movable cover plate 5813 is opened, the sampling cylinder 57 can penetrate downward through the U-shaped frame 5811. The outer wall of the convex block 5814 is in contact with the inner wall of the chute 5812, and the inner walls of the convex block 5814 and the magnetic block 5815 are both in contact with the second limiting rod 5816 to limit the movement track of the convex block 5814 and the magnetic block 5815, and further limit the movement track of the movable cover plate 5813.

[0034] The present invention provides a sampling device for road subgrade detection through improvement, and its working principle is as follows;

[0035] First, during use, connect the connecting frame 12 of the support plate assembly 1 to a road inspection vehicle, and the inspection vehicle drives this sampling device to move through the connecting frame 12;

[0036] Second, when sampling the road subgrade, first energize the electromagnet 5818, generate magnetic force through the electromagnet 5818 to adsorb the magnetic block 5815. The magnetic block 5815 drives the convex block 5814 to squeeze the second spring 5817 and move to the right along the second limiting rod 5816, and the convex block 5814 drives the movable cover plate 5813 to move to the right to open the U-shaped frame 5811;

[0037] Third, control the electric push rod 55 to push the movable cross plate 54 to slide downward along the optical rod 52. Since the bottom of the cover plate assembly 581 is supported by the support plate 11, when the movable cross plate 54 moves downward, it squeezes the first spring 584 to move downward along the first limiting rod 583. The movable cross plate 54 drives the sampling cylinder 57 at the bottom to move downward. The sampling cylinder 57 passes through the U-shaped frame 5811 and the sampling through hole 13 and extends to the bottom of the support plate 11. And control the second motor 56 to generate power to drive the sampling cylinder 57 to rotate through the output shaft to sample the roadbed.

[0038] Third, after the sampling cylinder 57 samples, control the electric push rod 55 to drive the movable cross plate 54 and the sampling cylinder 57 to move upward. After the sampling cylinder 57 moves to the top of the cover plate assembly 581, cut off the power supply to the electromagnet 5818. The elastic potential energy generated by the second spring 5817 pushes the convex block 5814 and the magnetic block 5815 to move leftward. The convex block 5814 drives the movable cover plate 5813 to move leftward, so that the movable cover plate 5813 covers the bottom of the sampling cylinder 57 to prevent the sample inside the sampling cylinder 57 from falling easily after sampling.

[0039] Fourth, then control the electric push rod 55 to drive the movable cross plate 54 and the sampling cylinder 57 to move upward. The movable cross plate 54 drives the first limiting rod 583 and the cover plate assembly 581 to move upward through the limiting ring 585, so that the cover plate assembly 581 moves with the sampling cylinder 57. Ensure that during the process of the sampling cylinder 57 moving to the sample box 3, the sample inside the sampling cylinder 57 will not fall. Then control the first motor 17 to generate power to drive the screw rod 18 to rotate through the output shaft. The rotation of the screw rod 18 drives the movable plate 19 to move rightward through the thread fit with the movable plate 19. And the movable plate 19 drives the slider 53 to move rightward along the slide rail 15. The slider 53 drives the sampling device 5 to move rightward, moves the sampling cylinder 57 to the top of the sample box 3, then energizes the electromagnet 5818 to open the movable cover plate 5813, and then control the second motor 56 to drive the sampling cylinder 57 to rotate, so that the roadbed sample in the sampling cylinder 57 falls into the sample box 3 to complete the sampling of the roadbed.

[0040] Fifth, by repeating the second to fourth steps, the roadbed sample can be sampled repeatedly.

[0041] The present invention provides a sampling device for road subgrade detection through improvement. By setting a sampling device 5, a movable cover plate device 58 is arranged at the bottom of the sampling cylinder 57 of the sampling device 5. A movable cover plate 5813 is arranged inside the U-shaped frame 5811 of the movable cover plate device 58. After the sampling cylinder 57 samples, the movable cover plate 5813 is controlled to close to cover the bottom of the sampling cylinder 57, avoiding the easy dropping of the internal sample in the sampling cylinder 57. It is ensured that during the process of moving the sampling cylinder 57 to the sample box 3, the internal sample in the sampling cylinder 57 will not drop, and the movable cover plate device 58 does not affect the sampling movement of the sampling cylinder 57. By setting a support plate assembly 1, the sampling device 5 is supported, limited, and its movement is controlled, and multiple sample boxes 3 are placed on the support plate assembly 1 for separately storing road subgrade samples at different positions.

[0042] The above shows and describes the basic principles, main features, and advantages of the present invention. Moreover, the standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the records in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art. Coupled with the circuit connection adopting the conventional connection method in the prior art, details are not described herein again.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sampling device for roadbed detection, characterized in that, it includes: A support plate assembly (1) for supporting and controlling the movement of the sampling device (5). A roller (2) is installed at the bottom of the support plate assembly (1). A sample box (3) is arranged on the right side of the middle of the top of the support plate assembly (1). A controller assembly (4) is fixed at the rear side of the top of the support plate assembly (1); A sampling device (5) installed on the top of the support plate assembly (1) for sampling the roadbed; The sampling device (5) includes a top plate (51), a light rod (52), a slider (53), a movable cross plate (54), an electric push rod (55), a second motor (56), a sampling cylinder (57) and a movable cover plate device (58). Light rods (52) are fixed at the bottom corners of the top plate (51). There are two sliders (53), and the two sliders (53) are respectively fixed at the bottom ends of the front and rear light rods (52). The light rods (52) vertically penetrate the inner corners of the movable cross plate (54). A second motor (56) is fixed in the middle of the top of the movable cross plate (54). A sampling cylinder (57) is arranged in the middle of the bottom of the movable cross plate (54), and the output shaft at the bottom of the second motor (56) is connected to the sampling cylinder (57). A movable cover plate device (58) is arranged at the bottom of the sampling cylinder (57), and the top of the movable cover plate device (58) is connected to the movable cross plate (54). The slider (53) is sleeved on the outer side of the slide rail (15), and the slider (53) slides horizontally along the outer wall of the slide rail (15). The slider (53) is fixedly connected to the movable plate (19); The movable cover plate device (58) includes a cover plate assembly (581), a support plate (582), a first limit rod (583), a first spring (584) and a limit ring (585). Support plates (582) are fixed on both the front and rear sides of the cover plate assembly (581). A first limit rod (583) is fixed at the top of the support plate (582). A first spring (584) is sleeved on the outer side of the first limit rod (583). The top of the first limit rod (583) penetrates the movable cross plate (54) and is fixedly connected to the limit ring (585), and the top of the support plate (582) is elastically connected to the movable cross plate (54) through the first spring (584). The cover plate assembly (581) is arranged at the bottom of the sampling cylinder (57); The cover plate assembly (581) includes a U-shaped frame (5811), a chute (5812), a movable cover plate (5813), a bump (5814), a magnetic block (5815), a second limiting rod (5816), a second spring (5817), and an electromagnet (5818). Chutes (5812) are provided on both the front and rear sides inside the U-shaped frame (5811). A movable cover plate (5813) is inserted into the right side inside the U-shaped frame (5811). Bumps (5814) are provided on the left sides of the front and rear ends of the movable cover plate (5813), and the bumps (5814) and the movable cover plate (5813) are integrally formed. A magnetic block (5815) is embedded in the right side inside the bump (5814). The bump (5814) is embedded into the chute (5812). A second limiting rod (5816) is fixedly arranged horizontally inside the chute (5812), and the second limiting rod (5816) horizontally penetrates through the bump (5814) and the magnetic block (5815). The right side of the magnetic block (5815) is elastically connected to the right inner side wall of the chute (5812) through a second spring (5817), and the second spring (5817) is sleeved outside the second limiting rod (5816). Electromagnets (5818) are installed on the right sides of the front and rear ends inside the U-shaped frame (5811). The front and rear sides of the U-shaped frame (5811) are fixedly connected to the support plate (582).

2. The sampling device for road subgrade detection according to claim 1, wherein: The support plate assembly (1) includes a support plate (11), a connecting frame (12), a sampling through hole (13), a sample box placement groove (14), a slide rail (15), a support block (16), a first motor (17), a screw rod (18), and a movable plate (19). A connecting frame (12) is fixed to the right end of the support plate (11). A sampling through hole (13) is provided on the left side inside the support plate (11). A sample box placement groove (14) is provided on the right side of the top end of the support plate (11). A slide rail (15) is fixedly arranged horizontally on the top surface of the support plate (11). Support blocks (16) are respectively fixed to the left and right ends of the front side of the top of the support plate (11), and a screw rod (18) is arranged between the two support blocks (16). The screw rod (18) is in transmission connection with the output shaft of the first motor (17). The screw rod (18) horizontally penetrates through the movable plate (19), and the inner wall of the movable plate (19) is in threaded connection with the screw rod (18). The rear side of the movable plate (19) is fixedly connected to the sampling device (5). The bottom of the sampling device (5) slides along the slide rail (15).

3. The sampling device for road subgrade detection according to claim 2, wherein: The inner diameter of the sampling through hole (13) is larger than the outer diameter of the sampling cylinder (57), and the sampling through hole (13) and the sample box (3) are arranged in the same horizontal straight line.

4. The sampling device for road subgrade detection according to claim 2, wherein: There are two slide rails (15) provided, the two slide rails (15) are arranged in parallel with the screw rod (18), and the surface of the slide rail (15) is smooth, and the inner wall of the slider (53) fits with the slide rail (15).

5. The sampling device for road subgrade detection according to claim 1, characterized in that: There are four first limiting rods (583) provided, the four first limiting rods (583) are all arranged vertically, and the inner wall of the movable cross plate (54) fits with the first limiting rod (583).

6. The sampling device for road subgrade detection according to claim 1, characterized in that: The length and width inside the U-shaped frame (5811) are both larger than the outer diameter of the sampling cylinder (57), and the inner wall of the U-shaped frame (5811) fits with the movable cover plate (5813).

7. The sampling device for road subgrade detection according to claim 1, characterized in that: The outer wall of the convex block (5814) fits with the inner wall of the sliding groove (5812), and the inner walls of the convex block (5814) and the magnetic block (5815) both fit with the second limiting rod (5816).

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