A roadbed compaction detection sampling device for highway engineering

Abstract

The present invention discloses a sampling device for detecting the compaction of roadbed used in highway engineering, which relates to the field of roadbed sampling, and comprises a bearing box, one end of which is fixedly mounted with a hollow pipe, one side of which is rotatably mounted with a lifting assembly, part of which is arranged inside the bearing box, and the other part of which is arranged inside the hollow pipe. In the sampling process of the present invention, the presence of the lifting assembly ensures that the device can adapt to the roadbed of a highway with a high soil density, and the presence of the hollow pipe and the movable rod ensures that the sampling assembly built into the movable rod will only move on a vertical line, avoiding the problem of tilted moving route, ensuring the accuracy of soil sampling data, and at the same time, the overall use of a drill bit to break the soil reduces the destructiveness to the soil, thereby ensuring that the detection result is closer to the actual data and improving the reliability of the final result.

Description

Technical Field

[0001] The invention relates to the technical field of roadbed sampling, in particular to a roadbed compaction detection sampling device used in highway engineering. Background Art

[0002] The roadbed is the foundation of the track or road surface. It is a geotechnical structure formed by excavation or filling. After the roadbed is built, its compaction needs to be tested and sampled to ensure that the compaction degree of the roadbed soil meets the design requirements, thereby ensuring the strength and stability of the roadbed.

[0003] For example, "A sampling device for detecting the compaction degree of roadbed in highway engineering" with publication number CN115032509B specifically includes: a rotating shell, the top of which is connected to a telescopic hose, the bottom of which is connected to a protective cover, and the inner wall of the rotating shell is fixedly connected to a limiting device; a control device, which is arranged on the top of the telescopic hose, and one side of the control device is connected to a water inlet pipe; a rotating shaft, one end of which passes through the control device and the limiting device in sequence and extends to the inside of the protective cover, and the end of the rotating shaft located inside the protective cover is fixedly connected to a sampling drill bit; the limiting device includes: a fixing ring, the outer side of which is fixedly connected to the inner wall of the rotating shell.

[0004] However, in the prior art, since the roadbed compaction test must be based on the roadbed being fully compacted, no matter how effective the compaction is, the soil density of the roadbed must be higher than the normal soil density. The traditional sampling device mainly uses a drill to drill sampling holes in the roadbed and then conducts sampling. However, this process will destroy the original stability of the soil, causing the originally compacted soil to be broken up, which directly affects the data accuracy of the sampling results. Summary of the invention

[0005] The purpose of the present invention is to provide a roadbed compaction detection sampling device for highway engineering, so as to solve the problem that the traditional sampling device proposed in the above background technology mainly uses a drill to drill sampling holes in the roadbed and then conducts sampling. However, this process will destroy the original stability of the soil, causing the originally compacted soil to be broken up, thereby directly affecting the data accuracy of the sampling results.

[0006] To achieve the above object, the present invention provides the following technical solution: a roadbed compaction detection sampling device for highway engineering, comprising a bearing box, one end of which is fixedly mounted with a hollow pipe, one side of which is rotatably mounted with a lifting assembly, part of which is arranged inside the bearing box, and the other part of which is arranged inside the hollow pipe, the hollow pipe is arranged in a vertical state, and a sampling assembly is movably mounted inside the hollow pipe;

[0007] The lifting assembly includes a transmission shaft, a docking rod and a movable rod. A tooth groove is provided on one side of the movable rod, a docking groove is provided on the outer wall of the docking rod, the movable rod is located on one side of the docking rod, the movable rod is vertically arranged inside the hollow pipe, the docking rod is horizontally installed inside the bearing box, the docking rod and the movable rod are perpendicular to each other, the docking rod is meshed with the tooth groove on the outer wall of the movable rod through the arranged docking groove, one end of the docking rod is fixedly connected to one end of the transmission shaft, the other end of the transmission shaft is movably connected to a first reduction motor through a belt drive assembly, and the first reduction motor is fixedly installed on the outer wall of the bearing box.

[0008] Preferably, the interior of the docking rod is rotatably connected to a limiting rod, the other end of the limiting rod is fixedly connected to a positioning end head, and the positioning end head is fixedly mounted on the inner wall of the bearing box.

[0009] Preferably, the sampling assembly includes a pulley, a guide rod, a transmission rod and a sampling barrel, the guide rod is slidably connected inside the pulley, one end of the transmission rod is fixedly connected to one end of the guide rod, and the top of the sampling barrel is fixedly connected to the other end of the transmission rod.

[0010] Preferably, a limit block is fixedly installed at the bottom of the sampling cylinder, one end of the sampling cylinder is fixedly connected to a contact head, a through hole is opened inside the contact head, and the through hole is connected to the sampling cylinder.

[0011] Preferably, a cavity is provided inside the movable rod, and the sampling tube is rotatably mounted inside the cavity, and the axis of the sampling tube coincides with the axis of the cavity.

[0012] Preferably, a widening head is fixedly mounted on the bottom of the movable rod, the limiting block is located inside the widening head, and the contact head passes through the bottom of the widening head.

[0013] Preferably, a blocking block is rotatably connected to the outer wall of the transmission rod, the blocking block is fixedly mounted on the inner wall of the hollow pipe, and the blocking block is located above the movable rod.

[0014] Preferably, a second reduction motor is movably connected to the outer wall of the pulley via a belt transmission assembly, and the second reduction motor is fixedly mounted on the top of the bearing box.

[0015] Preferably, a limit ring is fixedly installed at the junction of the pulley and the guide rod, the limit ring and the guide rod are slidably connected, and a protective sleeve is fixedly connected to the lower surface of the limit ring, and the protective sleeve is sleeved on the outer wall of the transmission rod.

[0016] Preferably, a groove is provided at the junction of the pulley and the protective sleeve, a protrusion is fixedly mounted on the outer wall of the protective sleeve, a clamping groove is provided on the groove wall, and the protrusion is located inside the clamping groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, a hollow pipe is provided in the vertical direction, and the movable rod in the lifting assembly is built in the hollow pipe. During the sampling process, the first reduction motor drives the transmission shaft to drive the docking rod to drive the movable rod to move downward. The existence of the lifting assembly ensures that the device can adapt to the roadbed of a highway with a high soil density, and the existence of the hollow pipe and the movable rod ensures that the sampling assembly built in the movable rod will only move on a vertical line, avoiding the problem of tilted moving route, ensuring the accuracy of soil sampling data, and at the same time, no drill bit is used to break the soil as a whole, reducing the destructiveness to the soil, thereby ensuring that the test results are closer to the actual data and improving the reliability of the final results.

[0019] 2. In the present invention, a contact head is designed at the bottom of the sampling barrel, and the contact head as a whole presents a hollow conical structure. During the sampling operation, the second reduction motor drives the pulley, and then drives the transmission rod through the guide rod. At the same time, the limit block at the bottom of the sampling barrel is built into the widened head at the bottom of the movable rod, which greatly improves the structural stability of the sampling barrel. When the lifting assembly starts to push the sampling barrel downward, the sampling barrel itself will also maintain a rotating state. This rotational motion enables the sampling barrel to separate the soil from the soil layer along the moving route. In this process, the soil at the center of the contact head through hole is minimally damaged, so more accurate sample data can be provided. This design not only improves the sampling efficiency, but also makes the final analysis results more reliable.

[0020] 3. In the present invention, the pulley effectively drives the guide rod to rotate through the limit ring, ensuring that the guide rod can smoothly perform normal rotation operations, thereby enabling the guide rod to smoothly cut soil from the soil layer. At the same time, the guide rod itself also has the ability to move along the direction of the hollow pipe. In actual application, guide rods of different heights can be selected according to the different depth requirements of the roadbed to adapt to different working conditions. In addition, the design of the protective sleeve and the protrusion can not only ensure the structural stability of the guide rod, but also effectively prevent the guide rod from being misaligned during rotation and up and down movement. The presence of the blocking block can determine the highest point position of the movable rod, thereby effectively avoiding unnecessary contact between the movable rod and the pulley, ensuring the smooth operation of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a three-dimensional structural schematic diagram of a roadbed compaction detection sampling device used in highway engineering according to the present invention;

[0022] Figure 2 It is a front view of a roadbed compaction detection sampling device used in highway engineering according to the present invention;

[0023] Figure 3 It is a side view of a lifting assembly of a roadbed compaction detection sampling device for highway engineering according to the present invention;

[0024] Figure 4 A schematic diagram of the connection and structure of a sampling assembly and a lifting assembly of a sampling device for detecting compactness of roadbed used in highway engineering according to the present invention;

[0025] Figure 5 A bottom view of a sampling assembly and a lifting assembly of a sampling device for detecting the compactness of a roadbed used in a highway project according to the present invention;

[0026] Figure 6 It is a schematic diagram of the internal planar structure of a movable rod of a roadbed compaction detection sampling device for highway engineering according to the present invention;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of a sampling component of a roadbed compaction detection sampling device for highway engineering according to the present invention;

[0028] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of part A.

[0029] In the figure: 1. bearing box; 2. hollow pipe; 3. sampling assembly; 4. lifting assembly; 5. second reduction motor; 6. first reduction motor; 31. pulley; 32. guide rod; 33. limit block; 34. contact head; 35. transmission rod; 36. blocking block; 37. through hole; 38. sampling tube; 39. protective sleeve; 310. groove; 311. limit ring; 312. protrusion; 313. slot; 41. transmission shaft; 42. docking rod; 43. docking groove; 44. limit rod; 45. positioning end; 46. movable rod; 47. tooth groove; 48. cavity; 49. widening head. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown: a sampling device for detecting compaction of roadbed for highway engineering, comprising a bearing box 1, a hollow pipe 2 is fixedly installed at one end of the bearing box 1, a lifting assembly 4 is rotatably installed at one side of the bearing box 1, part of the lifting assembly 4 is arranged inside the bearing box 1, and the other part of the lifting assembly 4 is arranged inside the hollow pipe 2, the hollow pipe 2 is arranged in a vertical state, and a sampling assembly 3 is movably installed inside the hollow pipe 2;

[0032] The lifting assembly 4 includes a transmission shaft 41, a docking rod 42 and a movable rod 46. A tooth groove 47 is provided on one side of the movable rod 46, and a docking groove 43 is provided on the outer wall of the docking rod 42. The movable rod 46 is located on one side of the docking rod 42. The movable rod 46 is vertically arranged inside the hollow pipe 2, and the docking rod 42 is horizontally installed inside the bearing box 1. The docking rod 42 and the movable rod 46 are perpendicular to each other. The docking rod 42 is meshed and connected with the tooth groove 47 on the outer wall of the movable rod 46 through the arranged docking groove 43. One end of the docking rod 42 is fixedly connected to one end of the transmission shaft 41, and the other end of the transmission shaft 41 is movably connected to the first reduction motor 6 through the belt transmission assembly. The first reduction motor 6 is fixedly installed on the outer wall of the bearing box 1. The internal rotation of the docking rod 42 is connected to the limit rod 44, and the other end of the limit rod 44 is fixedly connected to the positioning end 45, and the positioning end 45 is fixedly installed on the inner wall of the bearing box 1.

[0033] In this embodiment, the lifting assembly 4 is used to control the height of the sampling assembly 3. The sampling assembly 3 is installed in the hollow pipe 2. A part of the lifting assembly 4 is arranged in the hollow pipe 2, and the other part is arranged inside the bearing box 1. While ensuring the stability of the power transmission structure, it does not affect the normal use of the sampling assembly 3.

[0034] In the process of collecting roadbed soil samples, it is necessary to operate the lifting component 4 and the sampling component 3 at the same time. In order to achieve this operation, the power source of the lifting component 4 is provided by the first reduction motor 6. The first reduction motor 6 transmits power to the transmission shaft 41 through the belt transmission component. One end of the transmission shaft 41 is connected to the docking rod 42. In this way, the transmission shaft 41 can push the docking rod 42 to move downward. The outer wall of the docking rod 42 is designed with linearly arranged tooth grooves 47. These tooth grooves 47 are meshed with the docking grooves 43 on the outer wall of the movable rod 46. This design ensures that the power can be smoothly transmitted from the transmission shaft 41 to the movable rod 46, so that the movable rod 46 can move downward smoothly to complete the collection of soil samples.

[0035] In the present invention, the docking rod 42 and the limiting rod 44 are closely connected by a rotational connection. This connection method ensures the flexibility and stability between the two. The limiting rod 44 is further firmly fixed on the corresponding position of the bearing box 1 through its positioning end 45. Such a design not only ensures the stability and reliability of the limiting rod 44, but also provides a solid support for the power transmission structure in the lifting component 4, thereby ensuring the stability of the entire transmission structure. During the operation of the lifting component 4, the movable rod 46 will move accordingly. In order to ensure that the moving route of the movable rod 46 is accurate, the hollow pipe 2 plays a key guiding role. The inner diameter of the hollow pipe 2 matches the outer diameter of the movable rod 46, so that the movable rod 46 can move smoothly along the predetermined route during the movement, thereby avoiding any possible offset or deviation. This precise guiding mechanism ensures the stability of the sampling component 3 during the movement, so that it can accurately perform sampling operations along the predetermined path, thereby improving the accuracy and reliability of the entire sampling process.

[0036] In addition, the presence of the hollow pipe 2 and the movable rod 46 ensures that the sampling component 3 built into the movable rod 46 will only move on a vertical line, avoiding the problem of tilted moving route, thereby ensuring the accuracy of soil sampling data. At the same time, no drill bit is used to break the soil as a whole, reducing the destructiveness to the soil, thereby ensuring that the test results are closer to the actual data and improving the reliability of the final results.

[0037] Embodiment 2: According to Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the sampling assembly 3 includes a pulley 31, a guide rod 32, a transmission rod 35 and a sampling barrel 38. The guide rod 32 is slidably connected to the inside of the pulley 31, one end of the transmission rod 35 is fixedly connected to one end of the guide rod 32, the top of the sampling barrel 38 is fixedly connected to the other end of the transmission rod 35, a limit block 33 is fixedly installed at the bottom of the sampling barrel 38, one end of the sampling barrel 38 is fixedly connected to a contact head 34, a through hole 37 is opened inside the contact head 34, and the through hole 37 is connected to the sampling barrel 38. The sample tube 38 is connected, and a cavity 48 is opened inside the movable rod 46. The sampling tube 38 is rotatably installed inside the cavity 48. The axis of the sampling tube 38 coincides with the axis of the cavity 48. A widening head 49 is fixedly installed at the bottom of the movable rod 46. The limit block 33 is located inside the widening head 49. The contact head 34 passes through the bottom of the widening head 49. The outer wall of the pulley 31 is movably connected to the second reduction motor 5 through a belt transmission assembly. The second reduction motor 5 is fixedly installed on the top of the carrying box 1.

[0038] In this embodiment, the power source of the sampling assembly 3 is provided by the second reduction motor 5. During the sampling process, the second reduction motor 5 drives the pulley 31 through the belt transmission assembly to achieve the purpose of driving the guide rod 32 to rotate. The guide rod 32 drives the sampling tube 38 through the transmission rod 35, so that the contact head 34 at the bottom of the sampling tube 38 rotates at a high speed. A through hole 37 is opened inside the contact head 34 to allow soil to enter the sampling tube 38.

[0039] During the high-speed rotation of the contact head 34, the soil in the end thereof can be separated from the surrounding soil layer. With the use of the lifting assembly 4, soil samples on the moving route can be obtained in sequence. The soil sample passes through the through hole 37 and enters the interior of the sampling tube 38. The soil at the center of the through hole 37 is least damaged, which can ensure the accuracy of the sample data.

[0040] A widened head 49 is designed at the bottom of the movable rod 46. The main function of the widened head 49 is to accommodate and fix the limit block 33. The existence of the limit block 33 has a dual role: first, it ensures that the sampling barrel 38 and the movable rod 46 can maintain a synchronous movement state, so that the sampling barrel 38 can maintain a consistent movement trajectory with the movable rod 46 when sampling or other operations are performed; secondly, the existence of the limit block 33 can also ensure the stability of the sampling barrel 38, and prevent it from shaking up and down in the cavity 48 of the movable rod 46, which not only improves the positioning accuracy of the sampling barrel 38, but also ensures the stability and reliability of the entire sampling process.

[0041] Embodiment 3: According to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, a blocking block 36 is rotatably connected to the outer wall of the transmission rod 35, and the blocking block 36 is fixedly installed on the inner wall of the hollow pipe 2. The blocking block 36 is located above the movable rod 46, and a limiting ring 311 is fixedly installed at the intersection of the pulley 31 and the guide rod 32. The limiting ring 311 and the guide rod 32 are slidingly connected, and a protective sleeve 39 is fixedly connected to the lower surface of the limiting ring 311. The protective sleeve 39 is sleeved on the outer wall of the transmission rod 35, and a groove 310 is provided at the intersection of the pulley 31 and the protective sleeve 39. A protrusion 312 is fixedly installed on the outer wall of the protective sleeve 39, and a slot 313 is provided on the groove wall of the groove 310, and the protrusion 312 is located inside the slot 313.

[0042] In this embodiment, the blocking block 36 is used to determine the highest position of the movable rod 46 to prevent the movable rod 46 from contacting the pulley 31 during the upward movement. A limiting ring 311 is provided at the intersection of the pulley 31 and the guide rod 32 to ensure that the pulley 31 can drive the guide rod 32 to rotate without affecting the upward and downward movement of the guide rod 32.

[0043] A protective sleeve 39 is provided at the bottom of the limiting ring 311. The protective sleeve 39 is installed in the groove 310 of the pulley 31 to expand the contact range with the guide rod 32, thereby ensuring that the guide rod 32 is in a vertical state. The protrusion 312 is embedded in the card slot 313, which can play a role in determining the position of the protective sleeve 39.

[0044] In actual application, guide rods 32 of different heights can be selected to adapt to different working conditions according to the different depth requirements of the roadbed. In addition, the design of the protective sleeve 39 and the protrusion 312 can not only ensure the structural stability of the guide rod 32, but also effectively prevent the guide rod 32 from being misaligned during rotation and up and down movement.

[0045] The use method and working principle of the device: when obtaining soil samples of the roadbed, the bearing box 1 is installed on the bracket and deployed to the roadbed, and then the first reduction motor 6 and the second reduction motor 5 are started at the same time, the first reduction motor 6 drives the lifting component 4, and the second reduction motor 5 drives the sampling component 3;

[0046] The first reduction motor 6 drives the transmission shaft 41 through the belt transmission assembly, and drives the docking rod 42 at one end of the transmission shaft 41 to push the movable rod 46 downward through the cooperation of the tooth groove 47 and the docking groove 43. The movable rod 46 synchronously drives the sampling tube 38 through the limit block 33, so that the sampling tube 38 enters the deep soil layer, and the guide rod 32 also moves downward along the direction of the protective sleeve 39;

[0047] The second reduction motor 5 drives the pulley 31 through the belt transmission assembly to achieve the purpose of driving the guide rod 32 to rotate. The guide rod 32 drives the sampling barrel 38 through the transmission rod 35, so that the contact head 34 at the bottom of the sampling barrel 38 rotates at a high speed. A through hole 37 is provided inside the contact head 34 to allow soil to enter the sampling barrel 38. During the high-speed rotation of the contact head 34, the soil in its end can be separated from the surrounding soil layer. With the use of the lifting assembly 4, soil samples on the moving route can be obtained in sequence. The soil sample passes through the through hole 37 and enters the interior of the sampling barrel 38. The soil located at the center of the through hole 37 is least damaged, which can ensure the accuracy of the sample data;

[0048] The blocking block 36 is used to determine the highest position of the movable rod 46 to prevent the movable rod 46 from contacting the pulley 31 during the upward movement. A limit ring 311 is set at the intersection of the pulley 31 and the guide rod 32 to ensure that the pulley 31 can drive the guide rod 32 to rotate while not affecting the up and down movement of the guide rod 32. The widened head 49 at the bottom of the movable rod 46 is used to accommodate the limit block 33 to ensure that the sampling tube 38 and the movable rod 46 remain in a state of synchronous movement, and the existence of the limit block 33 can ensure the stability of the sampling tube 38 and prevent it from shaking up and down in the cavity 48 of the movable rod 46.

[0049] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A roadbed compaction detection sampling device for highway engineering, comprising a bearing box (1), characterized in that: A hollow pipe (2) is fixedly mounted on one end of the carrying box (1), a lifting assembly (4) is rotatably mounted on one side of the carrying box (1), a portion of the lifting assembly (4) is arranged inside the carrying box (1), and another portion of the lifting assembly (4) is arranged inside the hollow pipe (2), the hollow pipe (2) is arranged in a vertical state, and a sampling assembly (3) is movably mounted inside the hollow pipe (2); The lifting assembly (4) comprises a transmission shaft (41), a docking rod (42) and a movable rod (46); a tooth groove (47) is provided on one side of the movable rod (46); a docking groove (43) is provided on the outer wall of the docking rod (42); the movable rod (46) is located on one side of the docking rod (42); the movable rod (46) is vertically arranged inside the hollow pipe (2); the docking rod (42) is horizontally installed inside the bearing box (1); the docking rod (42) and the movable rod (46) are perpendicular to each other; the docking rod (42) is meshedly connected with the tooth groove (47) on the outer wall of the movable rod (46) through the docking groove (43); one end of the docking rod (42) is fixedly connected to one end of the transmission shaft (41); the other end of the transmission shaft (41) is movably connected to a first reduction motor (6) through a belt transmission assembly; the first reduction motor (6) is fixedly installed on the outer wall of the bearing box (1); The docking rod (42) is internally rotatably connected to a limit rod (44); the other end of the limit rod (44) is fixedly connected to a positioning end head (45); the positioning end head (45) is fixedly mounted on the inner wall of the carrying box (1); the sampling assembly (3) comprises a pulley (31), a guide rod (32), a transmission rod (35) and a sampling barrel (38); the guide rod (32) is slidably connected to the inside of the pulley (31); one end of the transmission rod (35) is fixedly connected to one end of the guide rod (32); the top of the sampling barrel (38) is fixedly connected to the other end of the transmission rod (35); the bottom of the sampling barrel (38) is fixedly mounted with a limit block (33); one end of the sampling barrel (38) is fixedly connected to the sampling barrel (38); A contact head (34) is provided inside the contact head (34), and a through hole (37) is provided inside the contact head (34), and the through hole (37) is connected to a sampling tube (38); a cavity (48) is provided inside the movable rod (46), and the sampling tube (38) is rotatably mounted inside the cavity (48), and the axis of the sampling tube (38) coincides with the axis of the cavity (48); a widening head (49) is fixedly mounted on the bottom of the movable rod (46), and the limit block (33) is located inside the widening head (49), and the contact head (34) passes through the bottom of the widening head (49); a blocking block (36) is rotatably connected to the outer wall of the transmission rod (35), and the blocking block (36) is fixedly mounted on the inner wall of the hollow pipe (2), and the blocking block (36) is located above the movable rod (46); the outer wall of the pulley (31) is movably connected to a second reduction motor (5) through a belt transmission assembly; the second reduction motor (5) is fixedly installed on the top of the bearing box (1); a limit ring (311) is fixedly installed at the intersection of the pulley (31) and the guide rod (32); the limit ring (311) and the guide rod (32) are slidably connected; the lower surface of the limit ring (311) is fixedly connected to a protective sleeve (39); the protective sleeve (39) is sleeved on the outer wall of the transmission rod (35); a groove (310) is provided at the intersection of the pulley (31) and the protective sleeve (39); a convex block (311) is fixedly installed on the outer wall of the protective sleeve (39); 2), a slot (313) is provided on the slot wall of the groove (310), and the protrusion (312) is located inside the slot (313). During the sampling process, the second reduction motor (5) drives the pulley (31) through another belt transmission component to achieve the purpose of driving the guide rod (32) to rotate. The guide rod (32) drives the sampling tube (38) through the transmission rod (35), so that the contact head (34) at the bottom of the sampling tube (38) rotates at a high speed. A through hole (37) is provided inside the contact head (34) to allow soil to enter the sampling tube (38). During the high-speed rotation of the contact head (34), the soil in the end thereof can be separated from the surrounding soil layer. In conjunction with the use of the lifting component (4), soil samples on the moving route are obtained in sequence.The soil sample passes through the through hole (37) and enters the interior of the sampling tube (38). The soil at the center of the through hole (37) is least damaged, thereby ensuring the accuracy of the sample data. A widened head (49) is designed at the bottom of the movable rod (46). The main function of the widened head (49) is to accommodate and fix the limit block (33). The existence of the limit block (33) has a dual function: first, it ensures that the sampling tube (38) and the movable rod (46) can maintain a synchronous movement state, so that the sampling tube (38) can maintain a consistent movement trajectory with the movable rod (46) when sampling or other operations are performed; second, the existence of the limit block (33) can also ensure the stability of the sampling tube (38) and prevent it from shaking up and down in the cavity (48) of the movable rod (46), which not only improves the positioning accuracy of the sampling tube (38), but also ensures the stability and reliability of the entire sampling process; The blocking block (36) is used to determine the highest position of the movable rod (46) to prevent the movable rod (46) from contacting the pulley (31) during the upward movement. A limiting ring (311) is provided at the intersection of the pulley (31) and the guide rod (32) to ensure that the pulley (31) can drive the guide rod (32) to rotate without affecting the upward and downward movement of the guide rod (32). A protective sleeve (39) is provided at the bottom of the limiting ring (311). The protective sleeve (39) is installed in the groove (310) of the pulley (31) to expand the contact range with the guide rod (32).

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