An undisturbed soil collecting device for soil testing

Abstract

This utility model discloses an undisturbed soil sampling device for soil testing, relating to the field of soil sampling technology for soil testing. The technical solution includes a sampling frame with a threaded rod inserted into it. The threaded rod is driven by a drive device mounted on the sampling frame to rotate vertically upwards or downwards. The bottom end of the threaded rod is connected via a connector to an annular sampling cylinder for entering the soil. Several sets of blades are rotatably embedded in the inner wall of the annular sampling cylinder. The advantages of this utility model are: the drive device fixed to the leveling sampling frame automatically completes the insertion and extraction of the sampling cylinder, achieving semi-automatic operation, reducing human error, avoiding excavation of surrounding soil, and significantly minimizing the sampling damage area; the addition of embedded blades at the lower end of the annular sampling cylinder allows for rotational cutting of the soil connection after sampling, facilitating extraction. Simultaneously, the unfolding of the blades prevents the soil inside the cylinder from loosening or slipping, significantly improving the sampling success rate.

Description

Technical Field

[0001] This utility model relates to the field of soil collection technology for soil testing, and in particular to a device for collecting undisturbed soil for soil testing. Background Technology

[0002] In fields such as ecological environment and agricultural engineering, collecting soil samples for laboratory testing and analysis of various soil quality indicators is one of the main methods for obtaining soil quality data and assessing soil quality. In undisturbed soil refers to soil samples that retain their original structure, stratification, and density without alteration during the sampling process. It plays a crucial role in research areas such as soil bulk density monitoring, indoor simulation of soil erosion, nutrient content monitoring, and greenhouse gas emission characteristics.

[0003] Currently, undisturbed soil sampling typically employs methods such as the impact method, the pressing method, and the rotary method, inserting a soil sampler into the soil and then excavating the surrounding soil to retrieve the undisturbed soil column. To ensure that the soil inside and around the sampler maintains its natural structure and state, and is minimally disturbed during sampling, a rigid sampling ring must be inserted perpendicularly to the soil surface to quickly and accurately determine the sampling depth. More importantly, the removal of the soil column must minimize damage to the surrounding soil, especially when the undisturbed soil sampling depth is significant. However, current traditional undisturbed soil sampling devices and processes are often haphazard, neglecting the protection of the surrounding soil. Furthermore, the impact method can easily alter the structure of the undisturbed soil, resulting in soil detachment or insufficient sampling depth upon removal, greatly reducing the sampling success rate.

[0004] Currently, there have been many improvements and inventions regarding undisturbed soil collection devices and sampling methods, with improvements made in aspects such as the insertion method and structure of the sampling cylinder. For example, CN101726429B discloses a field soil undisturbed profile soil column sampling drill, comprising: an inner undisturbed soil cylinder connected by a spiral outer cylinder fixed sleeve located at the bottom of the drill; the rotation of the fixed shaft at the lower part of the power unit's gearbox drives the fixed sleeve and the inner undisturbed soil cylinder to rotate; the outer wall of the spiral outer cylinder has two rows of parallel plate-like spirals, and two spiral soil-cutting blades at the bottom. This invention achieves excavation of the surrounding soil while the sampling cylinder is inserted into the soil. CN112816248A discloses a sampling device and its method for in-situ drilling of undisturbed soil columns. The biggest feature of this invention is that the in-situ drilling of undisturbed soil columns uses an impact pick instead of manual labor, which is more convenient, faster, more efficient, and less labor-intensive than manual soil sampling. CN113640045A discloses a non-compression soil sampling device for investigating soil pollution. This invention adds a soil-filling belt and a protective bag to the traditional drilling pipe. The three-layer design of the drilling pipe, sampling pipe, and protective bag effectively avoids soil compression during sampling while maintaining the original soil's porosity, moisture content, and other physical parameters. However, this invention does not solve the problems of soil cutting inside the sampling tube after the sampler is inserted, protection of the soil around the sampling tube (from damage), and soil loosening and slipping when the sampling tube is removed (the main reason for low sampling success rate).

[0005] Therefore, in view of the problems of large damage to the surrounding soil and low sampling success rate of traditional undisturbed soil sampling devices and methods, how to solve the problem of vertical entry of the sampling tube into the soil and rapid positioning of the sampling depth, avoiding soil excavation, and effective separation of soil inside the tube are urgent problems to be solved. Utility Model Content

[0006] To achieve the aforementioned objectives and address the aforementioned technical problems, this utility model provides a undisturbed soil sampling device for soil testing. This device aims to achieve the following objectives mentioned in the background art: avoiding errors such as sample tube tilting, insufficient depth, or excessive depth when using the artificial soil ring impact method to collect undisturbed soil, thus achieving rapid and accurate positioning of the sampling depth; preventing the undisturbed soil (sampling tube) from being removed through excavation after the sampling tube is inserted into the soil, and effectively separating the soil inside the sampling tube from the surrounding soil at the sampling depth; and avoiding or reducing the problem of soil loosening and slipping when the sampling tube is removed.

[0007] The technical solution is as follows: a soil sampling device for soil testing includes a sampling frame, on which a threaded rod is inserted. The threaded rod is driven by a driving device on the sampling frame to rotate vertically upward or vertically downward. The bottom end of the threaded rod is connected to an annular sampling cylinder for entering the soil through a connector. Several sets of blades are rotatably embedded in the inner wall of the annular sampling cylinder. The top outer end of the blades is connected to one end of a drive shaft that vertically penetrates the top of the annular sampling cylinder and extends to the top of the annular sampling cylinder.

[0008] The outer wall of the annular sampling tube is provided with graduation lines.

[0009] The lower outer side of the annular sampling tube is provided with an inclined edge that slopes inward from the outside, and the inclination angle of the inclined edge is 27-35°.

[0010] The inner wall of the annular sampling cylinder is provided with an annular embedding groove that can accommodate the blade. The bottom end of the drive shaft is located in the annular embedding groove. The blade rotates through the drive shaft, and part of the outer wall of the blade is housed in the annular embedding groove.

[0011] The connector includes a frame connected to the bottom of the threaded rod and several sets of support arms integrally arranged in a ring array on the outer wall of the frame. The support arms are located between two adjacent sets of transmission shafts. The bottom of the support arm is provided with a locking device. The locking device is detachably and fixedly connected to the support arm by bolts inserted into the support arm. The support arm is provided with several sets of screw holes for bolts to be inserted. The top of the annular sampling cylinder is provided with a concave groove that cooperates with the locking device.

[0012] The connector also includes several sets of frames integrally disposed on the outer wall of the frame, and each frame corresponds to a drive shaft.

[0013] A movable block is slidably provided inside the frame. A docking cylinder for inserting a drive shaft is rotatably inserted into the top of the movable block. A bearing is provided at the connection between the docking cylinder and the movable block. Both the upper and lower ends of the docking cylinder are hollow. The inner wall of the docking cylinder is engaged with the outer wall of the drive shaft. An adjusting screw is rotatably connected to one end of the movable block. The other end of the adjusting screw is threaded through the outer end of the frame and connected to a handwheel. A drive sprocket is sleeved on the outer wall of the docking cylinder.

[0014] The outer wall of the support arm is slidably fitted with a U-shaped frame. The U-shaped frame is connected to the frame body through a connecting elastic element. A tension sprocket is connected to the rotating shaft on the U-shaped frame. Several sets of driving sprockets and several sets of tension sprockets are connected by a chain for joint transmission. The inner side wall of the chain meshes with the outer wall of the driving sprocket, and the outer side wall of the chain meshes with the outer wall of the tension sprocket.

[0015] One of the U-shaped frames is equipped with a rotating device that drives the tension sprocket on its outer wall to rotate;

[0016] During chain drive, multiple sets of docking cylinders drive the corresponding drive shafts to rotate synchronously in the same direction, which in turn drives the corresponding blades to swing synchronously in the same direction.

[0017] The blade assembly includes a rotating seat connected to a drive shaft. Blade bodies are provided at the top of both ends of the rotating seat. A partition is fixedly provided in the middle of the inner cavity of the rotating seat. A hollow seat is fixedly provided in the inner cavity of the rotating seat above the partition. Arc-shaped sleeves are connected to both sides of the hollow seat. Arc-shaped rods adapted to their inner cavities are inserted into both ends of the arc-shaped sleeves. The arc-shaped sleeves and arc-shaped rods are coaxial with the annular sampling cylinder.

[0018] The end of the arc-shaped rod located outside the arc-shaped sleeve is connected to a side plate embedded in the side wall of the rotating seat and located below the blade body. The side plate and the partition are connected by an arc-shaped elastic element. A fan-shaped folding element is provided between the side plate and the partition and inside the arc-shaped sleeve and the arc-shaped elastic element. The hollow seat is connected to an air supply element.

[0019] The air supply component includes a first air vent groove located at the top of the drive shaft and connected to the hollow seat via a pipe. The top of the docking cylinder is connected to a flow divider via a rotary joint and a pipe. The flow divider is embedded in the frame and fixedly connected to the threaded rod. The threaded rod has a second air vent groove connected to the flow divider. The top of the threaded rod is connected to an air supply device that supplies gas to the second air vent groove via a rotary joint and an air supply pipe. The air supply pipe is also equipped with a vent valve.

[0020] An indicator is fixedly fitted on the outer wall of the drive shaft and below the frame. An indicator line is opened on the top of the outer wall of the annular sampling cylinder corresponding to the position of the indicator. When the indicator and the indicator line correspond, the inner end of the blade is facing the center of the annular sampling cylinder.

[0021] The sampling rack is equipped with electrical components that are electrically connected to the driving device. The electrical components include a power supply device and a control device.

[0022] The undisturbed soil sampling tube, based on traditional sampling devices, has been improved by replacing the previous manual hammering method of entering or removing the soil with an automated drive mechanism fixed to a rigid, easily leveled sampling frame. The adjustable leveling frame allows the sampling tube to enter the soil via the drive mechanism, with a threaded rod accurately determining the depth. This achieves semi-automation of undisturbed soil collection, reducing labor costs and effectively avoiding errors caused by insufficient or excessive sampling depth due to manual hammering, or sampling tube tilting. More importantly, after sampling, the sampling tube is automatically removed from the soil via the drive mechanism. Reversing the drive mechanism removes the sampling tube, eliminating the need for excavation of the surrounding soil and significantly reducing the area of ​​soil damage during sampling. The deployed blades at this point stabilize the soil and prevent slippage.

[0023] Based on the traditional annular sampling tube, an embedded blade is added to its lower end. This allows the soil inside the sampling tube to be cut off from the soil at the lower end by rotating the blade after the sampling tube is inserted to the target depth, making the sampling tube easy to remove. The unfolding of the blade also prevents the soil inside the tube from loosening or slipping when the sampling tube is removed, thus improving the sampling success rate.

[0024] The beneficial effects of the technical solution provided by this utility model embodiment are as follows: This solution provides an undisturbed soil collection device for soil testing, which can be applied to scenarios such as soil bulk density monitoring, soil erosion, nutrient content monitoring, greenhouse gas emission characteristics, soil quality assessment, and pollutant migration simulation research. Its advantages are mainly reflected in the following aspects:

[0025] (1) The insertion and extraction of the sampling tube are jointly completed by the drive device fixed on the sampling frame. The semi-automated sampling process can improve sampling efficiency and minimize damage to the surrounding soil. First, the rigid sampling frame can fix the insertion angle of the sampling tube and make the sampling depth positioning more convenient and accurate, avoiding invalid sampling problems caused by sampling tube tilting and inaccurate depth positioning; second, it avoids soil excavation, which is particularly effective for areas with limited sampling area and repeated sampling.

[0026] (2) The embedded blade at the lower end of the annular sampling tube can solve the problem that the soil inside the sampling tube and the soil at the lower end cannot be separated smoothly at the sampling depth (the difficulty of soil extraction without excavation: directly lifting it will likely result in insufficient soil extraction depth).

[0027] Furthermore, the blade assembly and air supply unit can support the soil inside the (blade assembly) cylinder, preventing it from loosening or even slipping during the lifting process, thus improving the sampling success rate. This device offers significant advantages for sampling deep soil columns. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0029] Figure 2 This is a top view of the structure of the annular sampling cylinder according to an embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of the connecting component in an embodiment of the present utility model.

[0031] Figure 4 This is a schematic diagram of the blade component in an embodiment of the present invention.

[0032] The attached figures are labeled as follows: 1. Sampling frame; 2. Threaded rod; 3. Drive device; 4. Connector; 41. Frame; 42. Support arm; 43. Adjusting screw; 44. Connecting cylinder; 45. U-shaped frame; 46. Connecting elastic element; 47. Tensioning sprocket; 48. Chain; 49. Rotating device; 410. Locking device; 411. Screw hole; 412. Diverter seat; 5. Annular sampling cylinder; 6. Inclined edge; 7. Blade component; 71. Rotating seat; 72. Blade body; 73. Arc-shaped sleeve; 74. Arc-shaped rod; 75. Side plate; 76. Arc-shaped elastic element; 77. Fan-shaped folding component; 78. Hollow seat; 79. Partition plate; 8. Drive shaft; 9. Electrical component; 10. Gas supply pipe; 11. Gas supply device; 12. Indicator; 13. Indicator line. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are only for explaining this utility model and are not intended to limit it.

[0034] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Example 1

[0038] See Figures 1 to 4 This utility model provides a soil sampling device for soil testing, including a sampling frame 1, a threaded rod 2 inserted on the sampling frame 1, and the threaded rod 2 being driven by a driving device 3 on the sampling frame 1 to rotate vertically upward or vertically downward.

[0039] The bottom end of the threaded rod 2 is connected to an annular sampling cylinder 5 for entering the soil via a connector 4. Under the action of the threaded rod 2, the annular sampling cylinder 5 rotates downward to enter the soil or rotates upward to leave the soil. On the one hand, the sampling depth can be controlled, and on the other hand, the annular sampling cylinder 5 rotates as it is inserted into the soil to reduce the direct pressure on the soil. When leaving the soil, the annular sampling cylinder 5 rotates in the opposite direction and is pulled upward, which is quick and convenient.

[0040] The inner wall of the annular sampling tube 5 is rotatably embedded with several sets of blades 7. The blades 7 can be set 2-5cm below the lower edge of the inner wall of the annular sampling tube 5. The top outer end of the blade 7 is connected to one end of the drive shaft 8 that vertically penetrates the top of the annular sampling tube 5 and extends to the top of the annular sampling tube 5. After the annular sampling tube 5 is inserted into the soil to a specified depth, the drive shaft 8 is manually rotated. The drive shaft 8 drives one end of the blade 7, causing the other end to swing, thereby cutting the soil inside the annular sampling tube 5 and separating the bottom of the original soil inside the annular sampling tube 5 from the area.

[0041] Preferably, the lower outer side of the annular sampling tube 5 in this embodiment is provided with an inclined edge 6 that slopes inward from the outside. The inclined edge 6 has an inclination angle of 27-35°, preferably 30°, so that the annular sampling tube 5 can enter the soil.

[0042] Preferably, the inner wall of the annular sampling cylinder 5 in this embodiment is provided with an annular embedding groove that can accommodate the blade 7. The bottom end of the drive shaft 8 is located in the annular embedding groove. The blade 7 can be partially housed in the annular embedding groove by rotating the drive shaft 8, so that the soil can enter the annular sampling cylinder 5 during normal use.

[0043] Please see the appendix Figure 3

[0044] Preferably, the connector 4 in this embodiment includes a frame connected to the bottom of the threaded rod 2 and several sets of support arms 42 integrally arranged in a ring array on the outer wall of the frame. The support arms 42 are located between two adjacent sets of transmission shafts 8. The bottom of the support arm 42 is provided with a locking device 410. The locking device 410 is detachably fixed to the support arm 42 by bolts inserted into the support arm 42. The support arm 42 is provided with several sets of screw holes 411 for bolts to be inserted. The top of the annular sampling cylinder 5 is provided with a concave groove that cooperates with the locking device 410. The locking device 410 and the concave groove cooperate to allow the connector 4 to be detachably connected to the annular sampling cylinder 5. The position of the locking device 410 on the support arm 42 is adjusted by the cooperation of the several sets of screw holes 411 and bolts to install annular sampling cylinders 5 of different specifications. The locking device 410 is selected according to the actual situation, and it is sufficient to ensure that the support arm 42 and the annular sampling cylinder 5 are locked in both directions.

[0045] Preferably, the connector 4 in this embodiment also includes several sets of frames 41 integrally disposed on the outer wall of the frame. The frames 41 correspond one-to-one with the drive shafts 8. That is, if there are four sets of drive shafts 8, then there are also four sets of frames 41. A movable block is slidably disposed inside the frame 41. A docking cylinder 44 for the drive shaft 8 to be inserted is rotatably inserted into the top of the movable block. A bearing is provided at the connection between the docking cylinder 44 and the movable block. The upper and lower ends of the docking cylinder 44 are hollow. The inner wall of the docking cylinder 44 is engaged with the outer wall of the drive shaft 8.

[0046] One end of the movable block is rotatably connected to the adjusting screw 43 via a bearing. The other end of the adjusting screw 43 is threaded through the outer end of the frame 41 and connected to a handwheel. After replacing the annular sampling cylinder 5 of different specifications, the position of the movable block can be adjusted by rotating the adjusting screw 43 according to the position of the drive shaft 8 on the replaced annular sampling cylinder 5, so that the docking cylinder 44 corresponds to the drive shaft 8.

[0047] The outer wall of the docking cylinder 44 is fitted with a drive sprocket, and the outer wall of the support arm 42 is slidably fitted with a U-shaped frame 45. The U-shaped frame 45 is connected to the frame body by a connecting elastic element 46, such as a spring. A tension sprocket 47 is connected to the rotating shaft on the U-shaped frame 45. Several sets of drive sprockets and several sets of tension sprockets 47 are connected by a chain 48 for joint transmission. Specifically, the inner side wall of the chain 48 meshes with the outer wall of the drive sprocket, and the outer side wall of the chain 48 meshes with the outer wall of the tension sprocket 47. With this arrangement, when the position of the docking cylinder 44 and the drive sprocket is changed by changing the moving block, the U-shaped frame 45 can adaptively adjust under the action of the connecting elastic element 46 to ensure the tension of the chain 48.

[0048] One of the U-shaped frames 45 is equipped with a rotating device 49 that drives the outer wall tension sprocket 47 to rotate. The rotating device 49 is, for example, a servo motor.

[0049] When the chain 48 is driven, multiple sets of docking cylinders 44 drive the corresponding drive shafts 8 to rotate synchronously in the same direction, and then the drive shafts 8 drive the corresponding blade pieces 7 to swing synchronously in the same direction.

[0050] Please see the appendix Figure 4

[0051] Preferably, the blade component 7 in this embodiment includes a rotating seat 71 connected to the drive shaft 8. Both ends of the rotating seat 71 are provided with blade bodies 72 so that the rotating seat 71 can cut the soil located in the annular sampling cylinder 5 as it swings with the drive shaft 8.

[0052] A partition 79 is fixedly provided in the middle of the inner cavity of the rotating seat 71. A hollow seat 78 is fixedly provided in the inner cavity of the rotating seat 71 above the partition 79. Both sides of the hollow seat 78 are connected to an arc-shaped sleeve 73. Arc-shaped rods 74 adapted to the inner cavity are inserted into both ends of the arc-shaped sleeve 73. The arc-shaped sleeve 73 and the arc-shaped rods 74 are coaxial with the annular sampling cylinder 5. The end of the arc-shaped rod 74 located outside the arc-shaped sleeve 73 is connected to a side plate 75 embedded in the side wall of the rotating seat 71 and located below the blade body 72. The side plate 75 and the partition 79 are connected by an arc-shaped elastic element 76, such as an arc-shaped spring. A fan-shaped folding element 77 is provided between the side plate 75 and the partition 79 and inside the arc-shaped sleeve 73 and the arc-shaped elastic element 76. The hollow seat 78 is connected to an air supply element.

[0053] After the blade 7 cuts the soil inside the annular sampling cylinder 5, in order to prevent the undisturbed soil collected inside the annular sampling cylinder 5 from falling downwards and being damaged when the annular sampling cylinder 5 rotates upwards, the blade body 72 is adjusted to a designated position via the drive shaft 8, and gas is injected into the hollow seat 78 via the air supply component. The gas enters the arc-shaped sleeve 73 and drives the arc-shaped rod 74 to move. The arc-shaped rod 74 drives the side plate 75 to unfold the fan-shaped folding piece 77. The unfolded fan-shaped folding piece 77 closes the area between two adjacent rotating seats 71, which provides a certain bottom support for the undisturbed soil collected inside the annular sampling cylinder 5 and prevents it from falling, thereby improving the quality and integrity of the collected undisturbed soil.

[0054] Preferably, the air supply component in this embodiment includes a first air vent groove located at the top of the drive shaft 8 and connected to the hollow seat 78 via a pipe. The top of the docking cylinder 44 is connected to a diverter seat 412 via a rotary joint and a pipe. The diverter seat 412 is embedded in the frame and fixedly connected to the threaded rod 2. The threaded rod 2 has a second air vent groove connected to the diverter seat 412. The top of the threaded rod 2 is connected to an air supply device 11 that supplies gas to the second air vent groove via a rotary joint and an air supply pipe 10. It should be noted that the air supply pipe 10 also has a vent valve. By opening the vent valve, gas can be discharged so that the arc-shaped rod 74 can drive the side plate 75 and the fan-shaped folding piece 77 to reset under the action of the arc-shaped elastic member 76.

[0055] Preferably, in this embodiment, an indicator 12 is fixedly sleeved on the outer wall of the drive shaft 8 and below the frame 41. An indicator line 13 is opened on the top of the outer wall of the annular sampling cylinder 5 corresponding to the position of the indicator 12. When the indicator 12 and the indicator line 13 correspond, the inner end of the blade 7 faces the center of the annular sampling cylinder 5. It should be noted that the inner ends of multiple sets of blades 7 do not contact each other. The position of the blade 7 can be determined by the user through the indicator 12 and the indicator line 13. At this time, the air supply device 11 can be turned on so that the fan-shaped folding piece 77 can be unfolded to provide bottom support and protection, so that the fan-shaped folding piece 77 can provide optimal support and protect the original soil performance.

[0056] Preferably, the outer wall of the annular sampling cylinder 5 in this embodiment is provided with scale lines (not shown in the figure) to control the sampling depth.

[0057] Preferably, the sampling rack 1 in this embodiment is provided with an electrical component 9 that is electrically connected to the driving device 3. The electrical component 9 includes a power supply device and a control device.

[0058] The method for using the undisturbed soil sampling device for soil testing includes the following steps:

[0059] S1. After selecting the original soil sampling location, place the sampling device horizontally, remove surface debris and ensure that there are no visible stones, then install the annular sampling tube 5, and fix it to the sampling frame 1 by cooperating with the locking device 410 through the concave groove at the top of the annular sampling tube 5.

[0060] S2. Use the drive device 3 to push the threaded rod 2 downwards, and slowly rotate the annular sampling cylinder 5 and insert it into the soil. Determine whether the sampling depth has been reached according to the scale line on the annular sampling cylinder 5.

[0061] S3. After the required depth is reached, the drive shaft 8 is used to drive the blade 7 to rotate, cutting the soil inside the annular sampling cylinder 5 from the surrounding soil.

[0062] S4. The drive device 3 rotates in the opposite direction, lifting the annular sampling cylinder 5 upwards;

[0063] S5. After being lifted, the rotating blade 7 is in a folded state, which can unload the original soil.

[0064] Example 2

[0065] Based on Embodiment 1, the driving device 3 includes a gear 1 that is rotatably mounted on the sampling frame 1 via a bearing, the gear 1 being threaded onto the outer wall of the threaded rod 2, and a gear 2 that meshes with the gear 1 and is driven to rotate by a motor. When the motor drives the gear 2, the gear 2 drives the gear 1, and the gear 1 drives the threaded rod 2 to rotate upward or downward through the threads on its inner wall.

[0066] This design utilizes the principle of gear transmission to achieve vertical movement of the threaded rod via motor drive. It is easy to operate, improves data collection efficiency, and reduces the labor intensity of manual operation.

[0067] Example 3

[0068] Based on Embodiment 1, unlike Embodiment 2, the driving device 3 includes a ring body rotatably sleeved on the outer wall of the threaded rod 2 and a hydraulic telescopic device connecting the ring body and the sampling frame 1. The sampling frame 1 has a threaded hole through which the threaded rod 2 passes. When the hydraulic telescopic device drives the ring body to move the threaded rod 2 up and down, the threaded rod 2 and the threaded hole cooperate to rotate. The driving device can be selected according to the actual situation. This is the prior art and will not be described in detail here.

[0069] The hydraulic telescopic device allows for adjustment of the force according to different soil conditions, resulting in more stable and accurate soil sampling. It is highly adaptable and improves the success rate and accuracy of sampling.

[0070] Example 4

[0071] Based on Example 1, the annular sampling cylinder 5 has a certain wall thickness. Except for the installation positions of the blade 7 and the drive shaft 8, which have a certain space, the rest is solid to increase its mechanical strength and avoid deformation.

[0072] The structure of the annular sampling tube was strengthened to avoid deformation during the sampling process, thus ensuring the stability of the sampling tube and the integrity of the sample.

[0073] Example 5

[0074] Based on Embodiment 1, the inner wall of the docking cylinder 44 is provided with protrusions, and the upper end of the outer wall of the drive shaft 8 is provided with a groove to accommodate the protrusions. While not affecting the separation of the docking cylinder 44 and the drive shaft 8, when the drive shaft 8 enters the docking cylinder 44, the rotation of the docking cylinder 44 can drive the drive shaft 8 to rotate.

[0075] This design simplifies the transmission structure, making the rotation of the blade more stable and improving the accuracy and efficiency of sampling.

[0076] Example 6

[0077] Based on Example 1, the gas supply device 11 is, for example, an induced draft fan, which can be fixed on the sampling frame 1. When the induced draft fan is working, it supplies gas through the gas supply pipe 10 and the rotary joint into the ventilation slot 2. Then the gas enters the diversion seat 412, and then enters each docking cylinder 44, the ventilation slot 1 and the hollow seat 78 through the pipe and the rotary joint.

[0078] By supplying air through a blower, the collected undisturbed soil can be effectively supported and protected, preventing damage during the extraction process and improving the integrity and quality of the sample.

[0079] Example 7

[0080] Based on Embodiment 1, a power supply device, such as a storage battery, provides power to the electrical components of this application, and a control device is used to control the operation of the electrical components in this application.

[0081] Using a battery as the power supply improves the portability and adaptability of the equipment, enabling the data collection device to be used in field environments without power, thus expanding its application scope.

[0082] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An undisturbed soil collecting device for soil testing, characterized by, Includes a sampling frame (1), on which a threaded rod (2) is inserted. The threaded rod (2) is driven to rotate vertically upward or downward by a driving device (3) on the sampling frame (1). The bottom end of the threaded rod (2) is connected to an annular sampling cylinder (5) for entering the soil via a connector (4). The inner wall of the annular sampling cylinder (5) is rotatably embedded with several sets of blades (7). The top outer end of the blades (7) is connected to one end of a drive shaft (8) that vertically penetrates the top of the annular sampling cylinder (5) and extends to the top of the annular sampling cylinder (5). The outer wall of the annular sampling tube (5) is provided with scale lines.

2. The undisturbed soil collection device for soil testing according to claim 1, characterized by The lower outer side of the annular sampling tube (5) is provided with an inclined edge (6) that slopes inward from the outside, and the inclination angle of the inclined edge (6) is 27-35°.

3. The undisturbed soil sampling device for soil testing according to claim 1, characterized in that, The inner wall of the annular sampling cylinder (5) is provided with an annular embedding groove that can accommodate the blade (7). The bottom end of the drive shaft (8) is located in the annular embedding groove. The blade (7) rotates through the drive shaft (8), and part of the outer wall of the blade (7) is housed in the annular embedding groove.

4. The undisturbed soil collection device for soil testing according to claim 1, characterized by, The connector (4) includes a frame connected to the bottom of the threaded rod (2) and several sets of support arms (42) integrally arranged in a ring array on the outer wall of the frame. The support arms (42) are located between two adjacent sets of transmission shafts (8). The bottom of the support arm (42) is provided with a locking device (410). The locking device (410) is detachably and fixedly connected to the support arm (42) by bolts inserted into the support arm (42). The support arm (42) is provided with several sets of screw holes (411) for bolts to be inserted. The top of the annular sampling cylinder (5) is provided with an inner recessed groove that cooperates with the locking device (410).

5. The undisturbed soil collection device for soil testing according to claim 4, characterized in that, The connector (4) also includes several sets of frames (41) integrally disposed on the outer wall of the frame, and the frames (41) correspond one-to-one with the drive shaft (8); A movable block is slidably provided inside the frame (41). A docking cylinder (44) for inserting the drive shaft (8) is rotatably inserted into the top of the movable block. A bearing is provided at the connection between the docking cylinder (44) and the movable block. The upper and lower ends of the docking cylinder (44) are hollow. The inner wall of the docking cylinder (44) is engaged with the outer wall of the drive shaft (8). An adjusting screw (43) is rotatably connected to one end of the movable block. The other end of the adjusting screw (43) is threaded through the outer end of the frame (41) and connected to a handwheel. A drive sprocket is sleeved on the outer wall of the docking cylinder (44). The outer wall of the support arm (42) is slidably fitted with a U-shaped frame (45). The U-shaped frame (45) is connected to the frame body through a connecting elastic element (46). A tension sprocket (47) is connected to the rotating shaft on the U-shaped frame (45). Several sets of driving sprockets and several sets of tension sprockets (47) are connected by a chain (48) for joint transmission. The inner side wall of the chain (48) meshes with the outer wall of the driving sprocket, and the outer side wall of the chain (48) meshes with the outer wall of the tension sprocket (47). One of the U-shaped frames (45) is equipped with a rotating device (49) that drives the tension sprocket on its outer wall to rotate; When the chain (48) is driven, multiple sets of docking cylinders (44) drive the corresponding drive shafts (8) to rotate synchronously in the same direction, and then the drive shafts (8) drive the corresponding blades (7) to swing synchronously in the same direction.

6. The undisturbed soil sampling device for soil testing according to claim 5, characterized in that, The blade component (7) includes a rotating seat (71) connected to the drive shaft (8). Both ends of the rotating seat (71) are provided with blade bodies (72). A partition (79) is fixedly provided in the middle of the inner cavity of the rotating seat (71). A hollow seat (78) is fixedly provided in the inner cavity of the rotating seat (71) above the partition (79). Both sides of the hollow seat (78) are connected to arc-shaped sleeves (73). Both ends of the arc-shaped sleeves (73) are inserted with arc-shaped rods (74) that are adapted to their inner cavities. The arc-shaped sleeves (73) and the arc-shaped rods (74) are coaxial with the annular sampling cylinder (5). The arc-shaped rod (74) is connected at one end outside the arc-shaped sleeve (73) to a side plate (75) embedded in the side wall of the rotating seat (71) and located below the blade body (72). The side plate (75) is connected to the partition plate (79) by an arc-shaped elastic element (76). A fan-shaped folding element (77) is provided between the side plate (75) and the partition plate (79) and inside the arc-shaped sleeve (73) and the arc-shaped elastic element (76). The hollow seat (78) is connected to an air supply element.

7. The undisturbed soil sampling device for soil testing according to claim 6, characterized in that, The air supply component includes a ventilation slot 1 located on the top of the drive shaft (8) and connected to the hollow seat (78) via a pipe. The top of the docking cylinder (44) is connected to a diverter seat (412) via a rotary joint and a pipe. The diverter seat (412) is embedded in the frame and fixedly connected to the threaded rod (2). The threaded rod (2) has a ventilation slot 2 connected to the diverter seat (412). The top of the threaded rod (2) is connected to an air supply device (11) that supplies gas to the ventilation slot 2 via a rotary joint and an air supply pipe (10). The air supply pipe (10) is also equipped with a vent valve.

8. The undisturbed soil collection device for soil testing according to claim 1, characterized by An indicator (12) is fixedly sleeved on the outer wall of the drive shaft (8) and below the frame (41). An indicator line (13) is opened on the top of the outer wall of the annular sampling cylinder (5) corresponding to the position of the indicator (12). When the indicator (12) and the indicator line (13) correspond, the inner end of the blade (7) faces the center of the annular sampling cylinder (5).

9. The undisturbed soil collection device for soil testing according to claim 1, characterized by, The sampling rack (1) is provided with an electrical device (9) that is electrically connected to the driving device (3). The electrical device (9) includes a power supply device and a control device.

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