A sampling device for detecting the compaction degree of a municipal road subgrade

Abstract

The application discloses a kind of municipal road subgrade compactness detection sampling device, and the application relates to foundation sampling technical field.The present application includes outer tube, the inner side surface of outer tube and the outer side surface of inner tube limit sliding, the top of outer tube and the rotating end of the bottom of transmission assembly are fixedly connected, the top of inner tube and the telescopic end of the bottom of transmission assembly are fixedly connected, the inner side surface of broken assembly and the outer side surface of outer tube are fixedly connected, the device is placed in the sampling position of subgrade, outer tube and broken assembly, into roadbed, can break the soil block outside outer tube, to obtain a test block more easily, inner tube inserts into a test block, the soil layer at the interval between inner tube and outer tube collapses to the inner wall of outer tube, and the secondary test block in the inner tube will not be damaged, so that the obtained secondary test block is more complete, when subgrade compaction detection sampling, obtain undamaged secondary test block, obtain more accurate compaction detection data.

Description

Technical Field

[0001] This invention relates to the field of foundation sampling technology, and more specifically to a sampling device for detecting the compaction degree of municipal road subgrade. Background Technology

[0002] The roadbed refers to the strip-shaped structure built according to the route location and certain technical requirements, which serves as the foundation for the pavement and is the basis for railways and highways. After the roadbed is constructed, its compaction degree needs to be sampled and tested to ensure the safety of the roadbed. The existing technical method is to drill holes in the roadbed surface to take out test blocks. When the compaction degree test is conducted, the soil is relatively compacted, making it difficult to insert samples directly. When drilling, the soil is easily separated, affecting the compaction degree of the test blocks and thus affecting the sampling results. Moreover, after sampling, the test blocks are difficult to remove, and forcibly removing them can easily cause the test blocks to break, affecting the compaction degree test. Therefore, we propose a sampling device for compaction degree testing of municipal roadbeds. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a sampling device for testing the compaction degree of municipal road subgrade, comprising: A bracket, and a gasket disposed at the bottom of the bracket; The sampling mechanism has a double-layer structure for sampling more complete test blocks; The bracket is fixedly connected to the surface of the sampling mechanism, and the bottom of the bracket is fixedly connected to the surface of the pad. The sampling mechanism includes: The outer cylinder is equipped with a crushing component on its exterior, which is used to crush the compacted soil layer outside the primary test block. The inner cylinder, located inside the outer cylinder, is used for re-sampling of the primary test block; A transmission assembly for driving the outer cylinder to rotate to obtain a test block once, and for driving the inner cylinder to insert a test block once; The inner side of the outer cylinder slides and is limited by the outer side of the inner cylinder. The top of the outer cylinder is fixedly connected to the rotating end of the bottom of the transmission assembly. The top of the inner cylinder is fixedly connected to the telescopic end of the bottom of the transmission assembly. The inner side of the crushing assembly is fixedly connected to the outer side of the outer cylinder. The device is placed at the sampling position of the roadbed. The transmission assembly is started, and the transmission assembly drives the outer cylinder and the crushing assembly to rotate and feed, thereby obtaining a primary test block. The transmission assembly drives the inner cylinder to move again, and the inner cylinder slides into the outer cylinder to insert the primary test block, thereby obtaining a secondary test block. The outer cylinder and the crushing assembly are screwed into the roadbed, which can break the soil outside the outer cylinder, thereby obtaining the primary test block more easily. The inner cylinder inserts the primary test block, and the soil layer at the interval between the inner cylinder and the outer cylinder collapses towards the inner wall of the outer cylinder, while the secondary test block inside the inner cylinder is not destroyed, making the obtained secondary test block more complete. When sampling for compaction testing of the roadbed, the undamaged secondary test block is obtained, resulting in more accurate compaction test data.

[0004] Furthermore, the brackets are symmetrically arranged on both sides of the outer cylinder, and the two brackets are fixedly connected to the surface of the transmission component on the side closest to each other. The bottom of each bracket is provided with a pad, and the pad has a high density. The brackets support the device, which facilitates sampling of the roadbed. The high density of the pad has a large mass, which can lower the center of gravity of the device, thereby preventing the device from tipping over and preventing operators from being injured. It also allows sampling to be performed without the need for personnel to support it.

[0005] Furthermore, a sampling head is fixedly connected to the side of the outer cylinder away from the transmission assembly. The sampling head has a groove on the side away from the outer cylinder, and several grooves are evenly distributed around its circumference. The side of the sampling head away from the outer cylinder forms a tooth shape. The outer cylinder rotates and feeds, driving the sampling head to rotate and drill into the foundation. The several grooves make the sampling head form a tooth shape, which can more easily feed the soil layer, improve the drilling effect of the foundation, and thus improve the sampling efficiency of a single test block.

[0006] Furthermore, the crushing assembly includes crushing rings, several of which are arranged along the axial direction of the outer cylinder. The inner surface of each crushing ring is fixedly connected to the outer surface of the outer cylinder, and the crushing rings are inclined away from the sampling head. The crushing rings are arranged such that the sampling head drills a hole, and the crushing rings drill a larger hole, thereby facilitating the removal of the outer cylinder. The inclination of the crushing rings away from the sampling head allows the crushed foundation to be pulled out when the outer cylinder is removed, preventing too much crushed foundation from remaining in the gaps and preventing soil clods from being compacted and stuck, further ensuring the removal of the outer cylinder.

[0007] Furthermore, a groove is provided on the side of the crushing ring near the sampling head. Several grooves are provided along the circumference of the crushing ring, and grooves are provided on the surface of several crushing rings. By providing grooves, the friction efficiency with the foundation can be increased, thereby drilling into the foundation more quickly, further improving the crushing effect, and making the crushed foundation finer, thus avoiding blockage.

[0008] Furthermore, a strip is fixedly connected to the outer surface of the outer cylinder. The strip is spiral-shaped, and several strips are arranged along the circumference of the outer cylinder. The end of the strip near the sampling head passes through several crushing rings in sequence, and the surface of the strip is fixedly connected to the inner side of the crushing ring. During drilling, soil blocks fall into the top of the crushing ring, come into contact with the foundation, generate friction, and move relative to the strip, thereby crushing the soil blocks again and breaking them into smaller pieces, ensuring that the outer cylinder can be easily drilled in and removed.

[0009] Furthermore, the inner cylinder has a slope at one end inside the outer cylinder, and a pressing block is slidably connected to the slope of the inner cylinder. The side of the pressing block away from the inner cylinder is fixedly connected to the inner wall of the outer cylinder, and several pressing blocks are arranged along the circumference of the outer cylinder. The inner cylinder is driven into the outer cylinder and squeezed between itself and the pressing block, thereby compressing the inner cylinder. This makes the diameter of the secondary test block slightly smaller than the inner diameter of the inner cylinder. After the inner cylinder is removed from the outer cylinder, the squeezing of the pressing block is canceled, and the inner cylinder recovers, thereby creating a gap between the secondary test block and the inner cylinder. This allows the secondary test block to remain inside the borehole of the foundation after the inner cylinder is removed, eliminating the need to remove the secondary test block from inside the inner cylinder.

[0010] Furthermore, a spring is fixedly connected to the top of the inner wall of the inner cylinder, and a circular plate is fixedly connected to the side of the spring near the sampling head. The circular plate is elastic, and its surface is slidably connected to the inner wall of the inner cylinder. The circular plate is deformed by the compression of the inner cylinder. When the secondary test block enters the inner cylinder, the circular plate is compressed, and the spring contracts and deforms. After the outer cylinder is removed from the inner cylinder, the elastic force of the spring restoring its deformation drives the circular plate to slide inside the inner cylinder, thereby squeezing out the secondary test block and preventing the test block from getting stuck inside the inner cylinder.

[0011] Furthermore, the transmission assembly includes a rotating telescopic rod. The surface of the rotating telescopic rod is fixedly connected to the side of the two supports that are close to each other. A connecting plate is fixedly connected to the end of the rotating telescopic rod near the inner cylinder. The surface of the connecting plate is rotatably connected to the side of the two supports that are close to each other. A column is fixedly connected to the side of the connecting plate away from the rotating telescopic rod. The end of the column away from the connecting plate is fixedly connected to the side of the outer cylinder near the connecting plate. Several columns are arranged along the circumference of the connecting plate. When the rotating telescopic rod is activated, it rotates and extends simultaneously, causing the connecting plate to rotate and move, and causing the column and outer cylinder to rotate and move, thereby completing the drilling operation and obtaining a test block.

[0012] Furthermore, a telescopic column is provided at the interval between the connecting plate and the inner cylinder. The telescopic column is located at the axis of the inner cylinder, and both ends of the telescopic column are fixedly connected to the side of the connecting plate that is close to the inner cylinder. The inner cylinder is fixedly connected to the output end of the telescopic column. After the outer cylinder completes drilling, the telescopic column is activated, which drives the inner cylinder to insert a test block once, thereby obtaining a secondary test block. Then the telescopic column retracts, the inner cylinder leaves the outer cylinder, and the foundation sampling is completed.

[0013] The beneficial effects of this invention are as follows: 1. This invention, by setting up a sampling mechanism, an outer cylinder and a crushing component, screws the roadbed in, which can crush the soil blocks outside the outer cylinder, thereby making it easier to obtain primary test blocks. The inner cylinder inserts the primary test blocks, and the soil layer at the interval between the inner and outer cylinders collapses towards the inner wall of the outer cylinder, while the secondary test blocks inside the inner cylinder are not destroyed, making the obtained secondary test blocks more complete. When sampling for compaction testing of the roadbed, the undamaged secondary test blocks are obtained, resulting in more accurate compaction test data.

[0014] 2. This invention, by setting a sampling head with several grooves forming a toothed shape, can more easily feed the soil layer, improve the drilling effect on the foundation, and thus improve the sampling efficiency of a single test block. The setting of the crushing ring, with the sampling head drilling a hole and the crushing ring drilling a larger hole, facilitates the removal of the outer cylinder. Moreover, the crushing ring is set to the side away from the sampling head, which can pull out the crushed foundation when removing the outer cylinder, avoiding too much crushed foundation in the gaps and preventing soil blocks from being compacted and stuck, further ensuring the removal of the outer cylinder. By opening the groove, the friction efficiency with the foundation can be increased, thereby drilling into the foundation interior more quickly, further improving the crushing effect, and making the crushed foundation finer, avoiding blockage.

[0015] 3. This invention features an inner cylinder, into which the outer cylinder enters and is compressed by the extrusion block. This causes the inner cylinder to contract, resulting in the diameter of the secondary test block being slightly smaller than the inner diameter of the inner cylinder. After the outer cylinder is removed from the inner cylinder, the compression by the extrusion block is canceled, and the inner cylinder recovers, creating a gap between the secondary test block and the inner cylinder. This allows the secondary test block to remain inside the borehole in the foundation after the inner cylinder is removed, eliminating the need to remove the secondary test block from inside the inner cylinder. After the outer cylinder is removed from the inner cylinder, the spring's restoring elasticity causes the circular plate to slide inside the inner cylinder, thereby extruding the secondary test block and preventing it from getting stuck inside the inner cylinder.

[0016] 4. This invention, through the setting of a transmission component, causes the rotating telescopic rod to rotate and extend simultaneously, the connecting plate to rotate and move, driving the column and outer cylinder to rotate and move, completing the drilling operation and obtaining a primary test block. After the outer cylinder completes drilling, the inner cylinder inserts a primary test block to obtain a secondary test block. Subsequently, the telescopic column retracts, the inner cylinder leaves the outer cylinder, and the foundation sampling is completed. During sampling, the outer cylinder rotation sampling is quick and convenient, and the compaction degree of the sample is not affected before testing when the inner cylinder is inserted for sampling. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the sampling device for detecting the compaction degree of municipal road subgrade according to the present invention. Figure 2 This is a schematic diagram of the sampling mechanism structure of the present invention; Figure 3 This is a schematic diagram of the crushing component structure of the present invention; Figure 4 This is a schematic diagram of the crushing ring structure of the present invention; Figure 5 This is a schematic diagram of the extrusion block structure of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the inner cylinder of the present invention; Figure 7 This is a schematic diagram of the transmission component structure of the present invention; Figure 8 This is a schematic diagram of the telescopic column structure of the present invention.

[0018] In the diagram: 1. Support; 2. Gasket; 3. Sampling mechanism; 31. Outer cylinder; 32. Inner cylinder; 33. Transmission assembly; 331. Rotary telescopic rod; 333. Connecting plate; 334. Column; 335. Telescopic column; 34. Crushing assembly; 341. Crushing ring; 342. Tank; 343. Strip; 35. Sampling head; 36. Extrusion block; 37. Spring; 38. Circular plate. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0020] Example 1, please refer to Figures 1-4 This invention relates to a sampling device for testing the compaction degree of municipal road subgrade, comprising: The bracket 1 and the pad 2 disposed at the bottom of the bracket 1; Sampling mechanism 3, which has a double-layer structure, is used to sample a more complete test block; The bracket 1 is fixedly connected to the surface of the sampling mechanism 3, and the bottom of the bracket 1 is fixedly connected to the surface of the pad 2; Sampling mechanism 3 includes: The outer cylinder 31 is provided with a crushing component 34 on its exterior. The crushing component 34 is used to crush the compacted soil layer outside the primary test block. Inner cylinder 32, which is disposed inside outer cylinder 31, is used for re-sampling of the primary test block; The transmission assembly 33 is used to drive the outer cylinder 31 to rotate to obtain a test block once, and to drive the inner cylinder 32 to insert a test block once. The inner side of the outer cylinder 31 slides against the outer side of the inner cylinder 32. The top of the outer cylinder 31 is fixedly connected to the rotating end of the bottom of the transmission assembly 33. The top of the inner cylinder 32 is fixedly connected to the telescopic end of the bottom of the transmission assembly 33. The inner side of the crushing assembly 34 is fixedly connected to the outer side of the outer cylinder 31. The device is placed at the sampling position on the roadbed. The transmission assembly 33 is started, which drives the outer cylinder 31 and the crushing assembly 34 to rotate and feed, thereby obtaining a test block. The transmission assembly 33 then drives the inner cylinder 32 to move again, and the inner cylinder 32 slides into the outer cylinder. Inside cylinder 31, a primary test block is inserted to obtain a secondary test block. The outer cylinder 31 and the crushing component 34 are screwed into the roadbed, which can break the soil outside the outer cylinder 31, making it easier to obtain the primary test block. The inner cylinder 32 inserts the primary test block. The soil layer at the interval between the inner cylinder 32 and the outer cylinder 31 collapses towards the inner wall of the outer cylinder 31, while the secondary test block inside the inner cylinder 32 is not destroyed, making the obtained secondary test block more complete. When sampling for compaction testing of the roadbed, the undamaged secondary test block is obtained, resulting in more accurate compaction test data.

[0021] The brackets 1 are symmetrically arranged on both sides of the outer cylinder 31. The two brackets 1 are fixedly connected to the surface of the transmission component 33 on the side that is close to each other. The bottom of each bracket 1 is provided with a pad 2. The pad 2 has a high density. The brackets 1 support the device, which is convenient for sampling the roadbed. The pad 2 has a high density and a large mass, which can lower the center of gravity of the device, thereby preventing the device from tipping over and preventing the operator from being injured. It also allows sampling to be done without the need for personnel to support it.

[0022] A sampling head 35 is fixedly connected to the side of the outer cylinder 31 away from the transmission component 33. The sampling head 35 has a groove on the side away from the outer cylinder 31, and several grooves are evenly distributed around its circumference. The side of the sampling head 35 away from the outer cylinder 31 forms a tooth shape. The outer cylinder 31 rotates and feeds, driving the sampling head 35 to rotate and drill into the foundation. The several grooves make the sampling head 35 form a tooth shape, which can more easily feed the soil layer, improve the drilling effect of the foundation, and thus improve the sampling efficiency of the primary test block.

[0023] The crushing assembly 34 includes crushing rings 341, several of which are arranged along the axial direction of the outer cylinder 31. The inner side of the crushing rings 341 is fixedly connected to the outer surface of the outer cylinder 31, and the crushing rings 341 are inclined away from the sampling head 35. The crushing rings 341 are arranged such that the sampling head 35 drills a hole, and the crushing rings 341 drill a larger hole, which facilitates the removal of the outer cylinder 31. The inclination of the crushing rings 341 away from the sampling head 35 can pull out the crushed foundation when the outer cylinder 31 is removed, avoiding too much crushed foundation in the gaps and preventing soil blocks from being compacted and stuck, further ensuring the removal of the outer cylinder 31.

[0024] A groove 342 is provided on the side of the crushing ring 341 near the sampling head 35. Several grooves 342 are provided along the circumference of the crushing ring 341, and grooves 342 are provided on the surface of several crushing rings 341. By providing grooves 342, the friction efficiency with the foundation can be increased, thereby penetrating the foundation more quickly, further improving the crushing effect, and making the crushed foundation finer, thus avoiding blockage.

[0025] A strip 343 is fixedly connected to the outer surface of the outer cylinder 31. The strip 343 is spiral-shaped and several strips 343 are arranged along the circumference of the outer cylinder 31. The end of the strip 343 near the sampling head 35 passes through several crushing rings 341 in sequence. The surface of the strip 343 is fixedly connected to the inner side of the crushing ring 341. During drilling, soil blocks fall into the top of the crushing ring 341. The soil blocks come into contact with the foundation and generate friction, resulting in relative movement between the soil blocks and the strip 343, thereby crushing the soil blocks again and breaking them into smaller pieces, ensuring that the outer cylinder 31 can be easily drilled in and removed.

[0026] Example 2, please refer to Figures 1-8The inner cylinder 32 has a slope at one end inside the outer cylinder 31, and a pressing block 36 is slidably connected to the slope of the inner cylinder 32. The side of the pressing block 36 away from the inner cylinder 32 is fixedly connected to the inner wall of the outer cylinder 31, and several pressing blocks 36 are arranged along the circumference of the outer cylinder 31. The inner cylinder 32 is driven into the outer cylinder 31, and a pressing is generated between it and the pressing block 36, thereby compressing the inner cylinder 32. This makes the diameter of the secondary test block slightly smaller than the inner diameter of the inner cylinder 32. After the inner cylinder 32 is removed from the outer cylinder 31, the pressing of the pressing block 36 is canceled, and the inner cylinder 32 is restored, thereby creating a gap between the secondary test block and the inner cylinder 32. This allows the secondary test block to remain inside the borehole of the foundation after the inner cylinder 32 is removed, so that it is not necessary to remove the secondary test block from inside the inner cylinder 32.

[0027] A spring 37 is fixedly connected to the top of the inner wall of the inner cylinder 32. A circular plate 38 is fixedly connected to the side of the spring 37 near the sampling head 35. The circular plate 38 is elastic and its surface is slidably connected to the inner wall of the inner cylinder 32. The circular plate 38 is deformed by the compression of the inner cylinder 32. When the secondary test block enters the inner cylinder 32, the circular plate 38 is compressed, and the spring 37 is deformed. After the outer cylinder 31 is removed from the inner cylinder 32, the elastic force of the spring 37 restores its deformation and drives the circular plate 38 to slide inside the inner cylinder 32, thereby squeezing out the secondary test block and preventing the test block from getting stuck inside the inner cylinder 32.

[0028] The transmission assembly 33 includes a rotating telescopic rod 331. The surface of the rotating telescopic rod 331 is fixedly connected to the side of the two supports 1 that are close to each other. A connecting plate 333 is fixedly connected to the end of the rotating telescopic rod 331 near the inner cylinder 32. The surface of the connecting plate 333 is rotatably connected to the side of the two supports 1 that are close to each other. A column 334 is fixedly connected to the side of the connecting plate 333 away from the rotating telescopic rod 331. The end of the column 334 away from the connecting plate 333 is fixedly connected to the side of the outer cylinder 31 near the connecting plate 333. Several columns 334 are arranged around the circumference of the connecting plate 333. When the rotating telescopic rod 331 is started, the rotating telescopic rod 331 rotates and extends, driving the connecting plate 333 to rotate and move, driving the column 334 and the outer cylinder 31 to rotate and move, thereby completing the drilling operation and obtaining a test block.

[0029] A telescopic column 335 is provided at the interval between the connecting plate 333 and the inner cylinder 32. The telescopic column 335 is located at the axis of the inner cylinder 32, and both ends of the telescopic column 335 are fixedly connected to the side of the connecting plate 333, i.e. the inner cylinder 32, which is close to each other. The inner cylinder 32 is fixedly connected to the output end of the telescopic column 335. After the outer cylinder 31 completes drilling, the telescopic column 335 is activated, which drives the inner cylinder 32 to insert a test block once, thereby obtaining a secondary test block. Then the telescopic column 335 retracts, and the inner cylinder 32 leaves the outer cylinder 31, completing the sampling of the foundation.

[0030] In use, the rotating telescopic rod 331 is activated. The rotating telescopic rod 331 rotates and extends simultaneously, causing the connecting plate 333 to rotate and move, which in turn causes the column 334 and outer cylinder 31 to rotate and move. The outer cylinder 31 rotates and feeds, causing the sampling head 35 to rotate and drill into the foundation. The sampling head 35 drills a hole, and the breaking ring 341 drills a larger hole. Soil blocks fall onto the top of the breaking ring 341. The soil blocks come into contact with the foundation, generating friction and relative movement with the strip 343, thus further breaking the soil blocks into smaller pieces, completing the drilling operation and obtaining... After the outer cylinder 31 completes drilling, the telescopic column 335 is activated, and the inner cylinder 32 enters the outer cylinder 31. The inner cylinder 32 inserts into the first test block, and compression occurs between it and the extrusion block 36, causing the inner cylinder 32 to contract. The circular plate 38 is deformed by the compression of the inner cylinder 32. The second test block enters the inner cylinder 32, and the circular plate 38 is compressed. The spring 37 contracts and deforms. Then the telescopic column 335 contracts, and the inner cylinder 32 leaves the outer cylinder 31. The elastic force of the spring 37 restoring its deformation causes the circular plate 38 to slide inside the inner cylinder 32, thereby squeezing out the second test block and completing the foundation sampling.

[0031] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A sampling device for testing the compaction degree of municipal road subgrade, characterized in that, include: A bracket (1) and a pad (2) disposed at the bottom of the bracket (1); The sampling mechanism (3) has a double-layer structure for sampling a more complete test block; The bracket (1) is fixedly connected to the surface of the sampling mechanism (3), and the bottom of the bracket (1) is fixedly connected to the surface of the pad (2). The sampling mechanism (3) includes: The outer cylinder (31) is provided with a crushing component (34) on its exterior, which is used to crush the compacted soil layer outside the primary test block; The inner cylinder (32) is located inside the outer cylinder (31) and is used to resample the primary test block; The transmission assembly (33) is used to drive the outer cylinder (31) to rotate to obtain a test block once, and to drive the inner cylinder (32) to insert a test block once; The inner side of the outer cylinder (31) is limited to slide against the outer side of the inner cylinder (32). The top of the outer cylinder (31) is fixedly connected to the rotating end of the bottom of the transmission assembly (33). The top of the inner cylinder (32) is fixedly connected to the telescopic end of the bottom of the transmission assembly (33). The inner side of the crushing assembly (34) is fixedly connected to the outer side of the outer cylinder (31). The device is placed at the sampling position of the roadbed.

2. The sampling device for detecting the compaction degree of municipal road subgrade according to claim 1, characterized in that: The brackets (1) are symmetrically arranged on both sides of the outer cylinder (31). The two brackets (1) are fixedly connected to the surface of the transmission assembly (33) on the side that is close to each other. The bottom of each bracket (1) is provided with a pad (2), and the pad (2) has a high density.

3. The sampling device for detecting the compaction degree of municipal road subgrade according to claim 2, characterized in that: A sampling head (35) is fixedly connected to the side of the outer cylinder (31) away from the transmission assembly (33). The sampling head (35) has a groove on the side away from the outer cylinder (31), and the groove of the sampling head (35) is evenly distributed around its circumference. The side of the sampling head (35) away from the outer cylinder (31) is toothed.

4. The sampling device for detecting the compaction degree of municipal road subgrade according to claim 3, characterized in that: The crushing component (34) includes a crushing ring (341), and several crushing rings (341) are arranged along the axial direction of the outer cylinder (31). The inner side of the crushing ring (341) is fixedly connected to the outer surface of the outer cylinder (31), and the crushing ring (341) is inclined to the side away from the sampling head (35).

5. A sampling device for detecting the compaction degree of municipal road subgrade according to claim 4, characterized in that: The crushing ring (341) has a groove (342) on the side near the sampling head (35). Several grooves (342) are provided along the circumference of the crushing ring (341), and the surface of several crushing rings (341) is provided with grooves (342).

6. A sampling device for detecting the compaction degree of municipal road subgrade according to claim 5, characterized in that: A strip (343) is fixedly connected to the outer surface of the outer cylinder (31). The strip (343) is spiral in shape, and several strips (343) are arranged along the circumference of the outer cylinder (31). Several crushing rings (341) are sequentially passed through one end of the strip (343) near the sampling head (35), and the surface of the strip (343) is fixedly connected to the inner side of the crushing ring (341).

7. A sampling device for detecting the compaction degree of municipal road subgrade according to claim 6, characterized in that: The inner cylinder (32) has a slope at one end inside the outer cylinder (31), and the slope of the inner cylinder (32) is slidably connected to an extrusion block (36). The side of the extrusion block (36) away from the inner cylinder (32) is fixedly connected to the inner wall of the outer cylinder (31), and several extrusion blocks (36) are arranged along the circumference of the outer cylinder (31).

8. A sampling device for detecting the compaction degree of municipal road subgrade according to claim 7, characterized in that: A spring (37) is fixedly connected to the top of the inner wall of the inner cylinder (32). A circular plate (38) is fixedly connected to the side of the spring (37) near the sampling head (35). The circular plate (38) is elastic and its surface is slidably connected to the inner wall of the inner cylinder (32).

9. A sampling device for detecting the compaction degree of municipal road subgrade according to claim 8, characterized in that: The transmission assembly (33) includes a rotating telescopic rod (331). The surface of the rotating telescopic rod (331) is fixedly connected to the side of the two supports (1) that are close to each other. A connecting plate (333) is fixedly connected to the end of the rotating telescopic rod (331) that is close to the inner cylinder (32). The surface of the connecting plate (333) is rotatably connected to the side of the two supports (1) that are close to each other. A column (334) is fixedly connected to the side of the connecting plate (333) that is away from the rotating telescopic rod (331). The end of the column (334) that is away from the connecting plate (333) is fixedly connected to the side of the outer cylinder (31) that is close to the connecting plate (333). Several columns (334) are arranged along the circumference of the connecting plate (333).

10. A sampling device for detecting the compaction degree of municipal road subgrade according to claim 9, characterized in that: A telescopic column (335) is provided at the interval between the connecting plate (333) and the inner cylinder (32). The telescopic column (335) is located at the axis of the inner cylinder (32), and both ends of the telescopic column (335) are fixedly connected to the side of the connecting plate (333) that is close to the inner cylinder (32), and the inner cylinder (32) is fixedly connected to the output end of the telescopic column (335).

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