A kind of embankment compactness punching quick soil taking device

Abstract

The present application relates to roadbed detection, in particular to a roadbed compaction degree punching rapid soil taking device. It comprises a sampling frame, a sampling assembly arranged on the sampling frame and a control system. The control system comprises a parameter acquisition module, a control unit and a power execution module connected with each other in sequence. The sampling assembly comprises a lifting driving element and a screw driving element. The screw driving element comprises a sampling hollow shaft rotatably connected with a moving plate and a screw disc arranged on the sampling hollow shaft. The parameter acquisition module acquires soil information in real time. The output instruction is obtained by real-time comparison of the parameter database of the control unit. The power execution module is started based on the output instruction to dynamically adjust the feeding speed of the lifting driving element and the rotating speed of the screw driving element. Based on the three-dimensional core parameters of "compaction degree-soil sample-moisture content", the downward feeding speed of the sampler and the screw soil taking rotating speed are dynamically adjusted to adapt to the dynamic changes of soil working conditions and solve the inherent defects of the existing fixed parameter sampling technology.

Description

Technical Field

[0001] This invention relates to roadbed testing, and more particularly to a rapid soil sampling device for drilling holes to measure roadbed compaction. Background Technology

[0002] As the core load-bearing structure of highway engineering, the compaction quality of the subgrade directly determines the highway's bearing capacity, deformation resistance, water stability, and post-construction settlement throughout its entire life cycle. Therefore, compaction degree, as a mandatory key control indicator for subgrade construction quality control, is crucial. The authenticity and accuracy of its test results are the core basis for subgrade engineering acceptance and quality assessment, and an important guarantee to avoid quality and safety hazards such as settlement, cracking, and collapse in the later stages of subgrade construction. According to JTG3450-2019 "Specifications for Field Testing of Highway Subgrade and Pavement", the core of compaction degree calculation is the ratio of the in-situ dry density of the subgrade soil measured by field sampling to the maximum dry density measured by the standard compaction test of the same soil sample in the laboratory. This requires that the soil sample taken on site must maintain a completely consistent compaction state, volume, and moisture content with the original subgrade, without any form of disturbance such as squeezing, stirring, dehydration, or crushing—that is, the in-situ representativeness of the soil sample is the fundamental prerequisite for reliable compaction degree test results.

[0003] Currently, the auger sampler is commonly used for on-site sampling of roadbed compaction. Its operation mode typically involves a fixed downward feed speed and a fixed auger rotation speed. While this mode is simple to operate and low in cost, it overlooks the inherent differences in the working conditions of the fill material at the roadbed construction site. In actual roadbed construction, there are three core variables that cannot be eliminated in the fill material of different road sections and layers: first, differences in compaction degree due to variations in compaction technology and construction control; second, differences in soil type (fine-grained soil, coarse-grained soil, etc.) and particle size distribution caused by the diverse sources of fill material; and third, fluctuations in moisture content caused by factors such as mixing precision, weather conditions, and paving time. These three variables directly determine the shear strength, cohesion, cutting resistance, and other engineering mechanical properties of the soil.

[0004] The existing fixed-parameter sampling mode is difficult to adapt to the dynamic changes in the aforementioned soil mechanical properties, resulting in many long-standing pain points in the industry: First, soil sample disturbance is severe, easily leading to problems such as squeezing and compression, dehydration, particle breakage, and sample leakage, causing distortion in the detection of moisture content and dry density, which in turn leads to deviations in compaction results and poses significant quality and safety hazards; Second, the sampling success rate is low. When facing high-compact, hard soil, the sampler is prone to stalling and blade damage. When facing soft plastic soil with high moisture content or loose coarse-grained soil, soil sample loss is likely, making it difficult to obtain complete samples and reducing testing efficiency; Third, manual operation relies on experience, and the human control error of feed speed and screw speed is large, resulting in poor reproducibility of test results under the same working conditions, which does not meet the requirements of standardization and impartiality in engineering testing. Summary of the Invention

[0005] To address the aforementioned problems in existing technologies, this invention provides a rapid soil sampling device for roadbed compaction drilling. By dynamically adjusting the downward feed speed of the sampler and the rotation speed of the spiral soil sampling mechanism based on the three-dimensional core parameters of "compaction degree-soil sample-moisture content", it adapts to dynamic changes in soil conditions, reduces soil sample disturbance, and improves detection accuracy and efficiency, thus overcoming the inherent defects of existing fixed parameter sampling technologies.

[0006] The objective of this invention can be achieved through the following technical solutions: A rapid soil sampling device for roadbed compaction drilling includes a sampling frame, a sampling component mounted on the sampling frame, and a control system. The control system includes a parameter acquisition module, a control unit, and a power execution module that are electrically connected in sequence. The sampling component includes a lifting drive and a screw drive, with the screw drive mounted on a moving plate of the lifting drive. Both the lifting drive and the screw drive are connected to the power execution module. The screw drive includes a hollow sampling shaft rotatably connected to the moving plate and a spiral disk mounted on the hollow sampling shaft. The parameter acquisition module is located at one end of the hollow sampling shaft. Based on the real-time soil information acquired by the parameter acquisition module, the control unit compares the data with the parameter database in real time to obtain an output command. Based on the output command, the power execution module is activated to dynamically adjust the feed speed of the lifting drive and the rotation speed of the screw drive.

[0007] Preferably, the parameter acquisition module includes a capacitive moisture content sensor for acquiring soil moisture content, a conductivity sensor for acquiring soil conductivity and vibration density, and a vibration density sensor. The capacitive moisture content sensor, conductivity sensor, and vibration density sensor are respectively arranged in an embedded array along one end of the sampling hollow shaft. The soil type is determined based on the real-time soil moisture content and soil conductivity-vibration density coupling of each sensor.

[0008] Preferably, the parameter acquisition module further includes a penetration resistance sensor for detecting soil penetration resistance and a torque sensor for detecting soil cutting torque. The penetration resistance sensor is located at the lower end of the sampling hollow shaft, and the torque sensor is located between the sampling hollow shaft and the power output end of the screw drive component. Soil compaction data are formed by combining the data collected by the penetration resistance sensor and the torque sensor.

[0009] Preferably, the control unit is a PLC controller, whose built-in parameter database stores the optimal feed rate and screw speed matching data corresponding to different soil types, moisture content, and compaction degrees.

[0010] Preferably, the sampling frame further includes a fixed plate and movable wheels. The fixed plate is located at the lower part of the sampling frame, and the connecting ends of the movable wheels are symmetrically hinged to both sides of the fixed plate.

[0011] Preferably, the lifting drive component includes a guide rod, a threaded rod, and a movable plate. The guide rods are symmetrically arranged and their two ends are respectively fixed to the sampling frame and the fixed plate on the sampling frame. The threaded rod is vertically located between the guide rods and rotatably disposed on the sampling frame and connected to the output shaft of the lifting drive motor. The movable plate is slidably connected to the guide rod and threadedly engaged with the threaded rod. The movable plate has a through hole in the middle for the sampling hollow shaft to pass through.

[0012] Preferably, the helical drive component further includes a threaded drive motor, the moving plate has a through hole in the middle, and the sampling hollow shaft is located in the through hole and connected to the threaded drive motor.

[0013] The beneficial effects of this invention are as follows: 1. By capturing the dynamic changes in soil moisture content, type, and full-depth compaction in real time through the parameter acquisition module, and combining it with the standardized parameter database built into the control unit, the feed speed and screw speed can be closed-loop adaptively adjusted. This reduces disturbances such as soil sample squeezing, tearing, and leakage at the source, ensuring the in-situ representativeness of the soil sample, improving the accuracy of compaction test results, and can flexibly adapt to different types of subgrade soil and multi-layer soil conditions with different compaction states. It effectively solves the drawbacks of fixed parameter operation of existing subgrade compaction soil sampling devices.

[0014] 2. By adapting to dynamic soil parameters in real time, it avoids problems such as drill rod stalling and component damage, improving sampling success rate and on-site operation efficiency. The parameter database supports real-time updates and corrections, adapting to the construction needs of different regions and soil sources, realizing automated control of the soil sampling process, replacing the traditional fixed-setting operation mode, and ensuring the reproducibility of test results under the same working conditions. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention; Figure 3 This is a partial schematic diagram of the present invention; Figure 4 This is a flowchart of the control system of the present invention; Legend: 1. Sampling frame; 21. Fixed plate; 22. Moving plate; 23. Moving wheel; 31. Guide rod; 32. Threaded rod; 33. Lifting drive motor; 41. Threaded drive motor; 42. Sampling hollow shaft; 43. Spiral disk; 44. Positioning cylinder seat; 51. Capacitive moisture content sensor; 52. Conductivity sensor; 53. Vibration density sensor; 54. Penetration resistance sensor; 6. Control unit. Detailed Implementation

[0017] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0018] Because most existing roadbed compaction sampling devices operate with fixed feed speed and fixed screw speed, they are difficult to adapt to the inherent fluctuations in soil compaction, soil type, and moisture content at the roadbed construction site. This can easily cause disturbances such as soil sample squeezing, grinding, and sample leakage, leading to systematic distortion of compaction test results. Furthermore, manual operation relies on experience, resulting in poor reproducibility of test results. In addition, even if existing technologies collect soil compaction, soil type, and moisture content data in advance, these parameters continue to change dynamically during the actual sampling process, making the traditional fixed parameter sampling mode unable to meet the standards.

[0019] In this regard, refer to Figures 1-4 As shown, this invention proposes a rapid soil sampling device for roadbed compaction drilling, comprising a sampling frame 1, a sampling component and a control system mounted on the sampling frame 1; the control system includes a parameter acquisition module, a control unit 6 and a power execution module connected in sequence to each other; the sampling component includes a lifting drive and a screw drive, the screw drive being mounted on a moving plate 22 of the lifting drive; both the lifting drive and the screw drive are connected to the power execution module; the screw drive includes a sampling hollow shaft 42 rotatably connected to the moving plate 22 and a spiral disk 43 mounted on the sampling hollow shaft 42; the parameter acquisition module is located at one end of the sampling hollow shaft 42; based on the real-time soil information acquired by the parameter acquisition module, the control unit 6 obtains output commands through real-time comparison with the parameter database, and the power execution module dynamically adjusts the feed speed of the lifting drive and the rotation speed of the screw drive based on the output commands.

[0020] Specifically, the sampling frame 1 is made of aluminum alloy and integrates a sampling component and a control system. The control system includes a parameter acquisition module, a control unit 6, and a power execution module that are electrically connected to each other via a CAN bus. The sampling component includes a lifting drive and a screw drive. The lifting drive can use existing technology, such as a transmission combination of a motor, screw, and guide column. The screw drive is fixedly mounted on the moving plate 22 of the lifting drive, and the moving plate 22 is slidably connected to the lifting drive. The control ends of both the lifting drive and the screw drive are electrically connected to the power execution module. The screw drive includes an alloy sampling hollow shaft 42 that is rotatably connected to the moving plate 22 via bearings, and a spiral disk 43 welded and fixed to the outer wall of the sampling hollow shaft 42. The parameter acquisition module is integrated into the sampling hollow shaft 42. The lower drill bit end of the spindle 42 is connected to the upper power connection end. During operation, the soil information collected in real time by the parameter acquisition module is compared with the built-in parameter database of the control unit 6 to generate standardized output commands. Based on the output commands, the power execution module is started to dynamically and synchronously adjust the axial feed speed of the lifting drive and the rotation speed of the drill rod of the screw drive. This solution solves the problems of fixed feed and speed of existing soil sampling devices, which are difficult to adapt to the dynamic changes of soil conditions, resulting in soil sample disturbance and detection distortion. It also addresses the problems of poor reproducibility and non-compliance with specifications caused by manual operation relying on experience. It realizes closed-loop adaptive speed regulation in the soil sampling process, ensures the in-situ representativeness of soil samples, improves the accuracy and standardization of compaction test results, and can adapt to the soil sampling needs of different roadbed conditions, thereby improving the efficiency of on-site sampling.

[0021] Because soil type differences affect the sampling parameters of soil sampling devices, relying solely on manual prediction before sampling or post-sampling laboratory testing can lead to a mismatch between speed adjustment parameters and the actual soil sample type. Furthermore, since roadbeds typically consist of multiple soil layers, it is difficult to determine the characteristics of the soil layer corresponding to the actual sampling depth during the sampling process. This can easily result in a mismatch between the optimal cutting speed of the soil layer and the actual cutting speed during sampling. This is particularly problematic for special roadbed fills such as coarse-grained soils and highly plastic clays, which can easily cause disturbances such as soil sample tearing, tube adhesion, and particle breakage. Therefore, to enable real-time determination of soil type based on the sampling process, the parameter acquisition module includes a capacitive moisture content sensor 51 for collecting soil moisture content, a conductivity sensor 52 for collecting soil conductivity, and a vibration density sensor 53 for collecting soil vibration density. These three types of sensors are arranged in an embedded array along the circumferential direction of the tube wall at the lower end of the sampling hollow shaft 42. The sensor probes are flush with the inner wall of the sampling hollow shaft 42, without protrusions or depressions. During operation, the capacitive moisture content sensor 51 collects real-time soil volumetric moisture content data, the conductivity sensor 52 collects real-time soil ionic conductivity data, and the vibration density sensor 53 collects... The system collects soil vibration response characteristic values ​​in real time. Based on the real-time data collected by three types of sensors, the control unit 6 determines the in-situ soil type at the sampling location in real time through a preset soil moisture content-conductivity-vibration density coupling algorithm. This enables in-situ real-time accurate identification of soil type, providing a reliable soil type basis for accurate matching of speed adjustment parameters. It significantly improves the adaptability of the device to different types of roadbed fill, reduces the sampling disturbance risk of different soil samples from the source, ensures the structural integrity of the soil samples, and solves the problem that existing technologies are unable to identify soil type in real time during sampling, resulting in mismatch between speed adjustment parameters and soil sample characteristics, and large disturbance during sampling of special soil samples.

[0022] To address the issue that existing soil sampling devices struggle to obtain real-time in-situ soil compaction data across the entire sampling depth, relying solely on single-point surface testing or pre-input compaction data before sampling, these methods only represent surface compaction. For multi-layered soil subgrades, real-time compaction data fails to reflect fluctuations in compaction across the sampling depth, leading to difficulties in adapting speed control parameters to variations in deep soil compaction. For high-compaction, hard soil, drill rod stalling and component damage are common; for low-compaction, loose soil, sample loss and structural damage are frequent. To this end, the parameter acquisition module also includes a penetration resistance sensor 54 for detecting soil penetration resistance and a torque sensor for detecting soil cutting torque. The penetration resistance sensor 54 uses a wear-resistant alloy probe, embedded in the lower end of the sampling hollow shaft 42 at the drill bit end face, with the probe flush with the drill bit end face. The torque sensor uses a flange-type torque transmitter, rigidly connected at both ends to the upper end of the sampling hollow shaft 42 and the power output end of the screw drive component via high-strength bolts. During operation, the penetration resistance sensor 54 collects real-time axial penetration resistance data of the soil, and the torque sensor collects real-time torque data of the drill rod rotation cutting. The control unit 6, based on a preset penetration resistance... - The torque coupling calibration model calculates in-situ soil compaction data across the entire sampling depth range in real time; it enables continuous real-time detection of soil compaction across the entire sampling depth range, providing a full-process compaction basis for dynamic adjustment of speed parameters. It is adaptable to soils with different compaction states, such as high and low compaction, improving sampling success rate and reducing soil sample disturbance during sampling. This solves the problem that existing technologies cannot obtain dynamic soil compaction data across the entire sampling depth range in real time, leading to speed parameters that cannot adapt to deep soil compaction fluctuations, causing equipment overload damage and soil sample loss due to disturbance. It also solves the problem that surface single-point compaction detection data is not representative enough and cannot support dynamic speed adjustment throughout the entire process.

[0023] To achieve automated and standardized adaptive speed regulation in the soil sampling process, the control unit 6 employs an industrial-grade PLC controller. Its built-in storage module contains a standardized parameter database. This database stores optimal feed speed and screw rotation speed matching data for different soil types, soil moisture content, and soil compaction degrees, calibrated through numerous indoor standard compaction tests and in-situ sampling tests. All matching data strictly adhere to the synchronous feed principle of screw soil sampling, meaning the axial lifting speed generated by the rotating screw blades is consistent with the axial feed speed of the drill rod. Simultaneously, it supports real-time parameter updates and corrections to adapt to the construction needs of different regions and soil sources. During operation, the PLC controller receives real-time soil data from the parameter acquisition module, calls the built-in parameter database for real-time comparison, and generates standardized speed regulation output commands, which are then transmitted to the power execution module. Furthermore, it is important to emphasize that real-time data updates based on the parameter acquisition module's acquisition frequency enable dynamic adjustments during the sampling process, achieving standardized and automated matching of soil sampling speed parameters. This solves the problem of structural disturbance in soil samples caused by speed parameters in existing soil sampling devices not conforming to the synchronous feed principle.

[0024] For roadbed compaction sampling operations, which are mostly conducted in the field roadbed construction section, the measuring points are scattered and the working ground is uneven. Traditional sampling frames are mostly fixed structures, and multiple measuring points need to be moved manually, resulting in low transfer efficiency. Sampling frames with fixed wheels have a small contact area between the wheels and the ground during operation, which can easily cause the frame to tilt and sway, making it impossible to ensure the verticality of the sampling, and even causing technical problems such as drill rod deflection damage and soil sample disturbance. To address this, the sampling frame 1 also includes a fixed plate 21 and solid rubber casters 23. The fixed plate 21 is horizontally welded and fixed to the lower part of the sampling frame 1. The connecting ends of the casters 23 are symmetrically arranged on the left and right sides of the fixed plate 21. When relocating, the casters 23 are lowered to move the device. During sampling, the casters 23 are used as fulcrums to rotate the entire soil sampling device, so that the head of the device is in contact with the ground during the original relocation operation. This ensures the horizontality of the sampling frame 1, guarantees the verticality of the sampling and the in-situ integrity of the soil sample, and solves the problems of inconvenient relocation and transportation of traditional sampling frames 1, easy tilting and shaking of the frame during operation, and inaccurate verticality of the sampling. It achieves a balance between the convenience of device relocation and the stability of sampling operation, and improves on-site operation efficiency.

[0025] To ensure the accuracy of the sampling depth control of the roadbed soil sampling device, the lifting drive mechanism includes two symmetrically arranged guide rods 31, a threaded rod 32, and a moving plate 22. The two guide rods 31 are vertically symmetrically arranged, with their upper and lower ends fixed to the top of the sampling frame 1 and the fixed plate 21 at the bottom of the sampling frame 1, respectively. The threaded rod 32 is vertically located within the center distance between the two guide rods 31, and its upper end is rotatably mounted on the top of the sampling frame 1 via a bearing. The upper end of the threaded rod 32 is coaxially connected to the output shaft of the lifting drive motor 33. The moving plate 22 is slidably connected to the guide rods 31 on both sides. The center position of the moving plate 22 forms a threaded transmission engagement with the threaded rod 32 via a ball screw nut. A circular through hole is provided in the middle for the vertical passage of the sampling hollow shaft 42. The lifting drive motor 33 is electrically connected to the power execution module. The combination of symmetrical guide rods 31 and threaded rods 32 ensures the straightness and smooth operation of the lifting of the moving plate 22. The threaded rods 32 enable the axial feed speed to be precisely matched with the dynamic speed adjustment command of the control system, strictly ensuring the synchronous matching of the feed speed and the screw speed. This structurally reduces soil sample disturbance caused by unstable feed, improves the control accuracy of sampling depth, and solves the problems of inaccurate feed speed control, poor matching with screw speed causing soil sample disturbance, and insufficient control accuracy of sampling depth in traditional lifting drive mechanisms.

[0026] To ensure stable sampling by the soil sampling device, a symmetrical screw drive component is used, including a screw drive servo motor. A circular through hole is opened in the middle of the moving plate 22, and the sampling hollow shaft 42 is vertically inserted into the through hole. The screw drive motor 41 is fixed on the upper surface of the moving plate 22, and its output shaft is coaxially fixedly connected to the upper end of the sampling hollow shaft 42. The control end of the screw drive motor 41 is electrically connected to the power execution module, and can move up and down synchronously with the moving plate 22 along the guide rod 31. This solves the problem of the difficulty in matching the screw speed and the axial feed speed, and realizes synchronous feeding of the screw soil sampling.

[0027] To reduce interference during auger soil sampling, a positioning cylinder seat 44 is also included, which is installed on the fixed plate 21. The middle part has a channel, and the bottom of the auger disc 43 is located in the channel of the positioning cylinder seat 44. In addition, the bottom surface of the positioning cylinder seat 44 is parallel to the grounding quarter point of the moving wheel 23. During the sampling operation, the weight of the entire device can suppress the soil around the sampling point, reducing interference to the roadbed surface during the sampling operation. At the same time, the positioning cylinder seat 44 itself can restrict the auger disc 43.

[0028] Therefore, in conjunction with the above, this solution embeds multiple sensors within the sampling hollow shaft 42 and sets up a control system to achieve dynamic acquisition of moisture content and compaction during the sampling process, providing real-time feedback on changes in soil sample state, and providing dynamic data support for dynamic speed correction. This forms a complete acquisition system of "static initial acquisition - dynamic process feedback," which differs from the existing simple static acquisition mode and solves the shortcomings of traditional detection methods in terms of non-real-time performance. Compared with the traditional method of using portable detectors to collect static parameters before sampling, this solution addresses the difficulty of adapting traditional static acquisition to the differences in moisture content and compaction of each soil layer in the multi-layered soil subgrade, as well as to the actual working conditions of dynamic changes in the compaction parameters of each soil layer in the subgrade.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A rapid soil sampling device for roadbed compaction drilling, characterized in that: The system includes a sampling frame, a sampling component mounted on the sampling frame, and a control system. The control system comprises a parameter acquisition module, a control unit, and a power execution module that are electrically connected in sequence. The sampling component includes a lifting drive and a spiral drive, with the spiral drive mounted on a moving plate of the lifting drive. Both the lifting drive and the spiral drive are connected to the power execution module. The spiral drive includes a sampling hollow shaft rotatably connected to the moving plate and a spiral disk mounted on the sampling hollow shaft. The parameter acquisition module is located at one end of the sampling hollow shaft. Based on the real-time soil information acquired by the parameter acquisition module, the system compares the data with the parameter database of the control unit in real time to obtain an output command. Based on the output command, the power execution module is activated to dynamically adjust the feed speed of the lifting drive and the rotation speed of the spiral drive.

2. The rapid soil sampling device for roadbed compaction drilling according to claim 1, characterized in that: The parameter acquisition module includes a capacitive moisture content sensor for acquiring soil moisture content, a conductivity sensor for acquiring soil conductivity and vibration density, and a vibration density sensor. The capacitive moisture content sensor, conductivity sensor, and vibration density sensor are respectively arranged in an embedded array along one end of the sampling hollow shaft. The soil type is determined based on the real-time soil moisture content and soil conductivity-vibration density coupling of each sensor.

3. The rapid soil sampling device for roadbed compaction drilling according to claim 2, characterized in that: The parameter acquisition module also includes a penetration resistance sensor for detecting soil penetration resistance and a torque sensor for detecting soil cutting torque. The penetration resistance sensor is located at the lower end of the sampling hollow shaft, and the torque sensor is located between the sampling hollow shaft and the power output end of the screw drive component. Soil compaction data are formed by combining the data collected by the penetration resistance sensor and the torque sensor.

4. The rapid soil sampling device for roadbed compaction drilling according to claim 1, characterized in that: The control unit is a PLC controller, whose built-in parameter database stores the optimal feed rate and screw speed matching data corresponding to different soil types, moisture content, and compaction degrees.

5. The rapid soil sampling device for roadbed compaction drilling according to claim 1, characterized in that: The sampling frame also includes a fixed plate and moving wheels. The fixed plate is located at the lower part of the sampling frame, and the connecting ends of the moving wheels are symmetrically hinged to both sides of the fixed plate.

6. The rapid soil sampling device for roadbed compaction drilling according to claim 1, characterized in that: The lifting drive component includes a guide rod, a threaded rod, and a movable plate. The guide rods are symmetrically arranged and their two ends are respectively fixed to the sampling frame and the fixed plate on the sampling frame. The threaded rod is vertically located between the guide rods and rotatably mounted on the sampling frame and connected to the output shaft of the lifting drive motor. The movable plate is slidably connected to the guide rod and threadedly engaged with the threaded rod. The movable plate has a through hole in the middle for the sampling hollow shaft to pass through.

7. The rapid soil sampling device for roadbed compaction drilling according to claim 1, characterized in that: The spiral drive also includes a threaded drive motor. The moving plate has a through hole in the middle, and the sampling hollow shaft is located in the through hole and connected to the threaded drive motor.

8. The rapid soil sampling device for roadbed compaction drilling according to claim 5, characterized in that: It also includes a positioning cylinder installed on a fixed plate, with a channel in the middle, and the bottom of the spiral disk located in the channel of the positioning cylinder seat.

9. The rapid soil sampling device for roadbed compaction drilling according to claim 3, characterized in that: The penetration resistance sensor is elliptical.

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