Multi-layer sampling device and method for soil analysis

Abstract

The invention relates to the technical field of soil multi-layer sampling, aims to solve the problems that a traditional soil sampling mode has great limitation and cannot comprehensively analyze soil, and particularly relates to a multi-layer sampling device and method for soil analysis, the multi-layer sampling device comprises a bottom plate, and four supports are fixedly connected to two sides of the top of the bottom plate; wherein a guide rod is fixedly connected between two supports, a threaded rod is movably connected between the other two supports through bearings, a mounting frame is arranged at the top of the bottom plate, a supporting frame is fixed to the top of the mounting frame through bolts, and a first hydraulic push rod and a second hydraulic push rod are fixedly connected to the bottom of the supporting frame; and a material taking assembly is arranged at the bottom end of the hydraulic push rod II through a transverse plate II. Compared with the prior art, the soil sampling device disclosed by the invention has the advantages that multi-layer and layered sampling can be carried out on soil, and a sample is sliced, so that more accurate soil information at different depth levels can be obtained, and meanwhile, the problem of application limitation of a traditional sampling mode is also solved.

Description

Technical Field

[0001] This invention relates to the field of multi-layer soil sampling technology, specifically to a multi-layer soil sampling device and method for soil analysis. Background Technology

[0002] By analyzing the chemical, physical, and biological properties of soil, we can assess indicators such as soil fertility, nutrient content, pH, and electrical conductivity, thereby understanding the soil quality. Soil analysis can also provide important guidance for agricultural production. Based on the results, appropriate fertilization programs, soil improvement measures, and planting management strategies can be determined to improve crop yield and quality. Analysis is crucial for sustainable agriculture and environmental management. Through the rational use and protection of soil resources, sustainable agricultural development can be achieved, reducing negative environmental impacts. In short, soil analysis is an important means of understanding soil conditions, guiding agricultural production, protecting the environment, planning land use, and achieving sustainable development. It provides key information on soil quality, nutrient status, and environmental health, helping to formulate reasonable management strategies and decisions.

[0003] Traditional soil sampling methods typically involve direct excavation. This method not only risks damaging the natural structure of the soil, leading to decreased aeration, water retention, and fertility, but also prevents multi-layered and stratified sampling. Consequently, it fails to obtain soil information at different depths, making it difficult to analyze the characteristics and changes of soil at each depth. This limits in-depth understanding of soil vertical distribution, soil structure, and chemical composition. Furthermore, direct excavation cannot be applied to soil physical property analysis or soil biological analysis. For example, when the focus of the analysis is on soil physical properties such as porosity, moisture content, and soil structure, direct excavation may damage these properties. When applied to certain soil biological analysis methods, such as measuring soil microbial communities and soil enzyme activity, direct excavation can interfere with or damage the microbial community.

[0004] To address the aforementioned technical shortcomings, a solution is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-layer sampling device and method for soil analysis, which solves the problems mentioned in the background art above.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-layer sampling device for soil analysis, comprising a base plate, four supports fixedly connected to the top two sides of the base plate, wherein a guide rod is fixedly connected between two of the supports, and a threaded rod is movably connected between the other two supports via bearings; a mounting frame is provided on the top of the base plate, and a support frame is fixedly fixed to the top of the mounting frame via bolts; a hydraulic push rod one and a hydraulic push rod two are fixedly connected to the bottom of the support frame; a spiral drill is fixedly installed at the bottom end of the hydraulic push rod one via a horizontal plate one, and a material collection component is provided at the bottom end of the hydraulic push rod two via a horizontal plate two;

[0007] The material handling assembly includes a connecting plate and a vertical plate. The connecting plate is fixedly connected to the bottom of the horizontal plate. The vertical plates are symmetrically fixedly connected to the bottom of the connecting plate. A housing is fixedly connected to the bottom of the vertical plate. A slide rail is fixedly connected to the inner side wall of the vertical plate. A miniature electric push rod is fixedly installed at the bottom center of the connecting plate. A lifting plate is fixedly connected to the bottom end of the miniature electric push rod. The two ends of the lifting plate slide in the corresponding slide rails. A motor is fixedly installed at the bottom end of the lifting plate. A polygonal limit block is fixedly connected to the bottom end of the motor.

[0008] Furthermore, two miniature electric push rods are fixedly installed inside the casing. A cover is provided between the two vertical plates. Insertion slots and through slots are sequentially provided at the bottom of the cover and the top of the casing. The output end of the miniature electric push rod 2 cooperates with the insertion slot through the through slot. An arc-shaped frame and a sealing plate are fixedly connected inside the cover. A push plate is fixedly connected to the side wall of the arc-shaped frame. An arc-shaped material holding frame is movably connected inside the cover through a bearing. The push plate is slidably connected inside the arc-shaped material holding frame.

[0009] Furthermore, a rotating block is movably connected to the top of the cover via a bearing, and the bottom end of the rotating block is fixedly connected to the top of the arc-shaped frame via a short shaft. A polygonal drive groove is provided on the top of the rotating block, and the polygonal limiting block cooperates with the polygonal drive groove.

[0010] Furthermore, a rotating frame is movably connected to the top of the base plate via a bearing, a motor for driving the rotating frame to rotate is installed at the bottom of the base plate, electric grippers are fixedly installed at both ends of the rotating frame, and a quick-freezing frame is slidably arranged on the top of the base plate.

[0011] Furthermore, a cutting assembly is provided on the top of the base plate. The cutting assembly includes a fixed frame and a double-track guide rail. A frame is fixedly installed on the top of the base plate. A hydraulic push rod three is fixedly installed on the top of the inner wall of the frame. A fixed frame is fixedly connected to the bottom end of the hydraulic push rod three. A double-track guide rail is symmetrically fixedly installed on the bottom end of the fixed frame. A slider is slidably connected to the outer track of the double-track guide rail.

[0012] Furthermore, a sliding frame is slidably connected within the inner rails of the two dual-track guide rails. A cutter is fixedly installed at the bottom of the sliding frame. A connecting frame is fixedly connected to the top of the dual-track guide rails. A bearing plate is fixedly connected to the side wall of the connecting frame. A second motor is fixedly installed at the top of the bearing plate. An eccentric wheel is provided at the bottom of the bearing plate. The output end of the second motor is fixedly connected to the top of the eccentric wheel. A drive block is slidably connected inside the sliding frame.

[0013] Furthermore, the top of the drive block is provided with an installation groove, the eccentric wheel is fixedly connected in the installation groove, the outer side wall of the slide frame is symmetrically rotatably connected with a connecting rod one, one end of the connecting rod one is rotatably connected with a connecting rod two, one end of the connecting rod two is rotatably connected with a connecting rod three, one end of the connecting rod three is rotatably connected with the slider, the top of the base plate is fixedly connected with an arc-shaped baffle plate, the side wall of the arc-shaped baffle plate is provided with multiple sets of cutting grooves at equal intervals, and the top of the arc-shaped baffle plate is fixedly installed with a housing two.

[0014] Furthermore, a second motor for driving the threaded rod to rotate is fixedly installed on the outer side of one of the supports, an external power supply is provided on the top of the base plate, one end of the mounting bracket is threadedly connected to the threaded rod, and the other end of the mounting bracket is slidably connected to the guide rod.

[0015] This invention also proposes a multi-layer sampling method for soil analysis, comprising the following steps:

[0016] Step 1: First, start the auger drill. The auger drills holes in the area to be sampled. After drilling is completed, the hydraulic push rod 2 drives the material taking component into the hole, and under the action of the threaded rod, the feed port of the arc-shaped material holding frame contacts the inner wall of the hole.

[0017] Step 2: Motor 1 drives the arc-shaped material collection frame to rotate through the cooperation of the polygonal limit block and the polygonal drive groove. The arc-shaped material collection frame rotates out of the cover. During the rotation, the arc-shaped material collection frame digs the soil on the inner wall of the hole and puts the excavated soil into the arc-shaped material collection frame until the feeding end of the arc-shaped material collection frame contacts the sealing plate. At this time, the arc-shaped material collection frame completes multi-layer sampling of the soil. Then, the hydraulic push rod 2 takes the sampled soil out of the hole.

[0018] Step 3: The electric gripper removes the arc-shaped material container filled with soil, along with its cover, from the vertical plate and places it in the quick-freezing frame for quick freezing, which helps the soil in the arc-shaped material container to solidify.

[0019] Step 4: The arc-shaped material holding frame rotates, and under the action of the pusher plate, the collected soil is detached from the arc-shaped material holding frame. Under the action of the electric gripper, the soil is pressed against the arc-shaped baffle plate. The cutter in the material cutting component slices the frozen soil layer by layer through the cutting groove, thereby ensuring that the material of each soil layer does not mix with the material of other soil layers, thus preventing errors in sample analysis. Subsequently, the sliced ​​soil is placed one by one into the storage box and arranged in the corresponding storage box in order.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. When in use, this invention uses an arc-shaped material-holding frame that rotates out from the casing to flexibly excavate the soil on the inner wall of the hole, thereby achieving multi-layer and stratified soil sampling. This allows for the acquisition of soil information at different depths and more accurate analysis of the characteristics and changes of soil at each depth. This facilitates a deeper understanding of the vertical distribution, soil structure, and chemical composition of the soil, while also maximizing the integrity of the soil surface in the sampling area.

[0022] 2. In use, the quick-freezing frame utilizes the thermal conductivity of the arc-shaped material container to rapidly freeze and shape the soil within it, facilitating slicing by the cutter. Multiple cutting grooves are provided on the side wall of the arc-shaped baffle, allowing the cutter to slice the quick-frozen soil layer by layer according to the set cutting thickness under the action of the hydraulic push rod. The sliced ​​soil is then labeled and stored, ensuring that the material from each soil layer does not mix with that from other soil layers, thus preventing errors in sample analysis. This significantly improves the accuracy of research on soil physical properties and soil biological analysis.

[0023] 3. When in use, the miniature electric push rod one and miniature electric push rod two are flexibly clamped and released through the cover, and can be flexibly replaced under the action of electric grippers, which facilitates sampling and collection of soil in multiple areas and at multiple points. Attached Figure Description

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings;

[0025] Figure 1 This is a side view of the spiral drilling rig structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the chassis in this invention;

[0027] Figure 3 This is a schematic diagram of the external structure of the chassis in this invention;

[0028] Figure 4 This is a schematic diagram of the material cutting assembly structure in this invention;

[0029] Figure 5 This is a rear view of the overall structure of the present invention;

[0030] Figure 6 This is a top view of the pusher plate structure in this invention;

[0031] Figure 7 This is a schematic diagram of the arc-shaped baffle plate structure in this invention.

[0032] Attached reference numerals: 1. Base plate; 2. Support; 3. Guide rod; 4. Threaded rod; 5. Mounting bracket; 6. Support frame; 701. Hydraulic push rod one; 702. Hydraulic push rod two; 8. Spiral drill; 9. Material handling assembly; 901. Connecting plate; 902. Vertical plate; 903. Slide rail; 904. Miniature electric push rod one; 905. Lifting plate; 906. Motor one; 907. Polygonal limit block; 908. Cover; 909. Arc-shaped frame; 910. Sealing plate; 911. Push plate; 912. Arc-shaped material holding frame; 913. Rotating block; 914. Polygonal drive groove; 10. Chassis one; 11. Miniature electric push rod II; 12. Rotating frame; 13. Electric gripper; 14. Quick-freezing frame; 15. Material cutting assembly; 150. Cutter; 151. Fixing frame; 152. Double track guide rail; 153. Sliding frame; 154. Connecting frame; 155. Motor II; 156. Eccentric wheel; 157. Connecting rod I; 158. Connecting rod II; 159. Connecting rod III; 160. Arc-shaped baffle plate; 161. Cutting groove; 162. Slider; 163. Drive block; 16. Bearing plate; 17. Motor II; 18. External power supply; 19. Frame; 20. Hydraulic push rod III; 21. Chassis II. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] like Figures 1-7As shown, a multi-layer sampling device for soil analysis includes a base plate 1. Four supports 2 are fixedly connected to the top two sides of the base plate 1. A guide rod 3 is fixedly connected between two supports 2, and a threaded rod 4 is movably connected between the other two supports 2 through a bearing. A mounting frame 5 is provided on the top of the base plate 1. A support frame 6 is fixed to the top of the mounting frame 5 by bolts. A hydraulic push rod 1 701 and a hydraulic push rod 2 702 are fixedly connected to the bottom of the support frame 6. A spiral drill 8 is fixedly installed at the bottom end of the hydraulic push rod 1 through a horizontal plate 1, and a material collection component 9 is provided at the bottom end of the hydraulic push rod 2 through a horizontal plate 2.

[0036] The material handling assembly 9 includes a connecting plate 901 and a vertical plate 902. The connecting plate 901 is fixedly connected to the bottom of the horizontal plate 2, and the vertical plate 902 is symmetrically fixedly connected to the bottom of the connecting plate 901. The bottom of the vertical plate 902 is fixedly connected to the housing 10. The inner side wall of the vertical plate 902 is fixedly connected to the slide rail 903. A miniature electric push rod 904 is fixedly installed at the bottom center of the connecting plate 901. The bottom end of the miniature electric push rod 904 is fixedly connected to the lifting plate 905. The two ends of the lifting plate 905 slide in the corresponding slide rail 903. A motor 906 is fixedly installed at the bottom end of the lifting plate 905. A polygonal limit block 907 is fixedly connected to the bottom end of the motor 906.

[0037] Inside the casing 10, two miniature electric push rods 21 are fixedly installed. A cover 908 is provided between the two vertical plates 902. The bottom of the cover 908 and the top of the casing 10 are provided with a plug-in slot and a through slot in sequence. The output end of the miniature electric push rod 21 cooperates with the plug-in slot through the through slot. An arc-shaped frame 909 and a sealing plate 910 are fixedly connected inside the cover 908. A push plate 911 is fixedly connected to the side wall of the arc-shaped frame 909. An arc-shaped material holding frame 912 is movably connected inside the cover 908 through a bearing. The push plate 911 is slidably connected inside the arc-shaped material holding frame 912.

[0038] The top of the cover 908 is movably connected to the rotating block 913 via a bearing. The bottom end of the rotating block 913 is fixedly connected to the top of the arc frame 909 via a short shaft. The top of the rotating block 913 is provided with a polygonal drive groove 914, and the polygonal limit block 907 cooperates with the polygonal drive groove 914.

[0039] In the specific setup, hydraulic push rod 701 drives the auger drill 8 to move downwards, and the auger drill 8 drills a hole in the area to be sampled. After drilling is completed, the mounting frame 5 is driven to slide horizontally and stably under the action of threaded rod 4 and guide rod 3. The auger drill 8 moves out from above the drilled hole and moves the material taking component 9 to directly above the hole. Then, hydraulic push rod 702 is started. Hydraulic push rod 702 drives the vertical plate 902 to move downwards through the connecting plate 901 and completely enter the hole. Then, the mounting frame 5 is driven to move through threaded rod 4, so that the feed port of the arc-shaped material holding frame 912 contacts the inner wall of the hole.

[0040] Subsequently, motor 906, through the cooperation of polygonal limit block 907 and polygonal drive groove 914, drives the arc-shaped material holding frame 912 to rotate. The arc-shaped material holding frame 912 rotates out from the cover 908. During the rotation, the arc-shaped material holding frame 912 excavates the soil on the inner wall of the hole and allows the excavated soil to enter the arc-shaped material holding frame 912 until the feeding end of the arc-shaped material holding frame 912 contacts the sealing plate 910. At this time, the arc-shaped material holding frame 912 completes multi-layer sampling of the soil. At the same time, the sealing plate 910 seals the feeding end of the arc-shaped material holding frame 912. Then, hydraulic push rod 702 drives the arc-shaped material holding frame 912, which has completed sampling, to rise until it comes out of the hole. Then, under the action of threaded rod 4, it moves to a position close to the electric gripper 13.

[0041] The electric gripper 13 clamps and holds the outer wall of the cover 908. Then, the two miniature electric push rods 11 inside the chassis 10 are activated. The output end of the miniature electric push rod 11 disengages from the insertion slot at the bottom of the cover 908. At this time, the miniature electric push rod 11 releases its restriction on the cover 908. Then, the miniature electric push rod 904 located at the bottom of the connecting plate 901 drives the motor 906 and the polygonal limit block 907 to move upward synchronously through the lifting plate 905 until the polygonal limit block 907 disengages from the polygonal drive slot 914. It should be noted that the chassis 10 is equipped with a built-in power supply for powering the miniature electric push rod 904 and the miniature electric push rod 11. After the miniature electric push rod 904 and the miniature electric push rod 11 release their restriction on the cover 908, the electric gripper 13 clamps the outer wall of the cover 908 and removes it from between the two vertical plates 902.

[0042] Example 2

[0043] like Figures 1-7 As shown, a rotating frame 12 is movably connected to the top of the base plate 1 via a bearing, a motor for driving the rotating frame 12 to rotate is installed at the bottom of the base plate 1, electric grippers 13 are fixedly installed at both ends of the rotating frame 12, and a quick-freezing frame 14 is slidably arranged on the top of the base plate 1.

[0044] A cutting assembly 15 is provided on the top of the base plate 1. The cutting assembly 15 includes a fixed frame 151 and a double track guide rail 152. A frame 19 is fixedly installed on the top of the base plate 1. A hydraulic push rod 20 is fixedly installed on the top of the inner wall of the frame 19. The bottom end of the hydraulic push rod 20 is fixedly connected to the fixed frame 151. The bottom end of the fixed frame 151 is symmetrically fixedly installed with the double track guide rail 152. A slider 162 is slidably connected to the outer track of the double track guide rail 152.

[0045] A sliding frame 153 is slidably connected to the inner rails of two double-track guide rails 152. A cutter 150 is fixedly installed at the bottom of the sliding frame 153. A connecting frame 154 is fixedly connected to the top of the double-track guide rails 152. A bearing plate 16 is fixedly connected to the side wall of the connecting frame 154. A second motor 155 is fixedly installed at the top of the bearing plate 16. An eccentric wheel 156 is provided at the bottom of the bearing plate 16. The output end of the second motor 155 is fixedly connected to the top of the eccentric wheel 156. A drive block 163 is slidably connected inside the sliding frame 153.

[0046] The top of the drive block 163 is provided with an installation groove, and the eccentric wheel 156 is fixedly connected in the installation groove. The outer side wall of the slide frame 153 is symmetrically rotatably connected with a connecting rod 157. One end of the connecting rod 157 is rotatably connected with a connecting rod 2 158. One end of the connecting rod 2 158 is rotatably connected with a connecting rod 3 159. One end of the connecting rod 3 159 is rotatably connected to the slider 162. The top of the base plate 1 is fixedly connected with an arc-shaped baffle plate 160. The side wall of the arc-shaped baffle plate 160 is provided with multiple sets of cutting grooves 161 at equal intervals. The top of the arc-shaped baffle plate 160 is fixedly installed with a housing 21.

[0047] It should be noted that the interior of chassis 21 also houses a miniature electric push rod 904, a lifting plate 905, a motor 906, and a polygonal limit block 907.

[0048] One of the supports 2 has a motor 17 fixedly installed on its outer side to drive the threaded rod 4 to rotate. An external power supply 18 is provided on the top of the base plate 1. One end of the mounting bracket 5 is threadedly connected to the threaded rod 4, and the other end of the mounting bracket 5 is slidably connected to the guide rod 3.

[0049] In the specific setup, after the electric gripper 13 clamps the cover 908 and removes it from the vertical plate 902, the motor drives the rotating frame 12 to rotate 180 degrees. At this time, the arc-shaped material holding frame 912 containing multiple layers of soil is rotated to a position close to the quick-freezing frame 14, while the unused arc-shaped material holding frame 912 without soil moves to a position close to the vertical plate 902. The unused arc-shaped material holding frame 912 is placed between the two vertical plates 902 under the action of the electric gripper 13, and is re-fixed under the action of the micro electric push rod 1 904 and the micro electric push rod 2 11, so as to collect soil from other positions in the hole and reduce detection errors.

[0050] Subsequently, the quick-freezing frame 14 cools and quick-freezes the soil in the arc-shaped material container 912. It should be noted that the arc-shaped material container 912 is made of stainless steel, which has strong thermal conductivity and rust resistance. The quick-freezing frame 14 quickly freezes the moisture in the soil in the arc-shaped material container 912, thereby fixing the soil in the arc-shaped material container 912.

[0051] After being quick-frozen, the soil is transferred to the position of the arc-shaped baffle plate 160. Then, the miniature electric push rod 904 in the second housing 21 drives the motor 906 and the polygonal limit block 907 to descend synchronously through the lifting plate 905 until the polygonal limit block 907 is embedded in the polygonal drive groove 914. The motor 906 drives the arc-shaped material frame 912 to rotate through the cooperation of the polygonal limit block 907 and the polygonal drive groove 914. Under the action of the push plate 911, the soil is detached from the arc-shaped material frame 912 and pressed against the arc-shaped baffle plate 160 by the electric gripper 13.

[0052] Subsequently, the hydraulic push rod 20 drives the cutting assembly 15 below to move downward synchronously and starts the motor 155. The motor 155 drives the eccentric wheel 156 to rotate. The rotation of the eccentric wheel 156 drives the drive block 163 to slide horizontally within the slide frame 153. Under the action of the eccentric wheel 156 and the drive block 163, the slide frame 153 slides back and forth on the inner wall of the double track guide rail 152. During the sliding process, the slide frame 153 drives the slider 162 to slide back and forth along the outer track of the double track guide rail 152 through the cooperation of the connecting rod 157, the connecting rod 258 and the connecting rod 359. During the back and forth sliding process, the slide frame 153 drives the cutter 150 to slide back and forth.

[0053] like Figure 4 As shown, the cutting edge of the cutter 150 is configured as an arc-shaped opening that matches the outer wall of the arc-shaped material holding frame 912;

[0054] like Figure 7 As shown, the side wall of the arc-shaped baffle plate 160 has multiple sets of cutting grooves 161, which facilitates the cutter 150 to slice the quick-frozen soil layer by layer according to the set cutting thickness under the action of the hydraulic push rod 20, thereby ensuring that the material of each soil layer will not mix with the material of other soil layers, thus preventing errors in sample analysis.

[0055] The soil slices were then placed one by one into storage boxes and arranged in order within their respective storage containers.

[0056] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0057] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-layer sampling device for soil analysis, characterized in that, The base plate (1) has four supports (2) fixedly connected to the top two sides. A guide rod (3) is fixedly connected between two of the supports (2), and a threaded rod (4) is movably connected between the other two supports (2) through a bearing. The base plate (1) has a mounting frame (5) on its top. A support frame (6) is fixed to the top of the mounting frame (5) by bolts. A hydraulic push rod one (701) and a hydraulic push rod two (702) are fixedly connected to the bottom of the support frame (6). A spiral drill (8) is fixedly installed at the bottom of the hydraulic push rod one (701) through a horizontal plate one. A material picking component (9) is provided at the bottom of the hydraulic push rod two (702) through a horizontal plate two. The material handling assembly (9) includes a connecting plate (901) and a vertical plate (902). The connecting plate (901) is fixedly connected to the bottom of the horizontal plate. The vertical plate (902) is symmetrically fixedly connected to the bottom of the connecting plate (901). The bottom of the vertical plate (902) is fixedly connected to a housing (10). The inner sidewall of the vertical plate (902) is fixedly connected to a slide rail (903). A miniature electric push rod (904) is fixedly installed at the bottom center of the connecting plate (901). A lifting plate (905) is fixedly connected to the bottom end of the miniature electric push rod (904). The two ends of the lifting plate (905) slide in the corresponding slide rails (903). A motor (906) is fixedly installed at the bottom end of the lifting plate (905). A polygonal limit block (907) is fixedly connected to the bottom end of the motor (906).

2. The multi-layer sampling device for soil analysis according to claim 1, characterized in that, Two miniature electric push rods (11) are fixedly installed inside the casing (10). A cover (908) is provided between the two vertical plates (902). The bottom of the cover (908) and the top of the casing (10) are sequentially provided with a plug-in slot and a through slot. The output end of the miniature electric push rod (11) is engaged with the plug-in slot through the through slot. An arc-shaped frame (909) and a sealing plate (910) are fixedly connected inside the cover (908). A push plate (911) is fixedly connected to the side wall of the arc-shaped frame (909). An arc-shaped material holding frame (912) is movably connected inside the cover (908) through a bearing. The push plate (911) is slidably connected inside the arc-shaped material holding frame (912).

3. The multi-layer sampling device for soil analysis according to claim 2, characterized in that, The top of the cover (908) is movably connected to a rotating block (913) via a bearing. The bottom end of the rotating block (913) is fixedly connected to the top of the arc frame (909) via a short shaft. A polygonal drive groove (914) is provided on the top of the rotating block (913). The polygonal limit block (907) cooperates with the polygonal drive groove (914).

4. The multi-layer sampling device for soil analysis according to claim 1, characterized in that, The top of the base plate (1) is movably connected to a rotating frame (12) via a bearing. A motor for driving the rotating frame (12) to rotate is installed at the bottom of the base plate (1). Electric grippers (13) are fixedly installed at both ends of the rotating frame (12). A quick-freezing frame (14) is slidably arranged on the top of the base plate (1).

5. A multi-layer sampling device for soil analysis according to claim 1, characterized in that, A cutting assembly (15) is provided on the top of the base plate (1). The cutting assembly (15) includes a fixed frame (151) and a double track guide rail (152). A frame (19) is fixedly installed on the top of the base plate (1). A hydraulic push rod three (20) is fixedly installed on the top of the inner wall of the frame (19). The bottom end of the hydraulic push rod three (20) is fixedly connected to the fixed frame (151). The bottom end of the fixed frame (151) is symmetrically fixedly installed with double track guide rails (152). A slider (162) is slidably connected in the outer track of the double track guide rail (152).

6. The multi-layer sampling device for soil analysis according to claim 5, characterized in that, A sliding frame (153) is slidably connected to the inner rails of the two double-track guide rails (152). A cutter (150) is fixedly installed at the bottom of the sliding frame (153). A connecting frame (154) is fixedly connected to the top of the double-track guide rails (152). A bearing plate (16) is fixedly connected to the side wall of the connecting frame (154). A second motor (155) is fixedly installed at the top of the bearing plate (16). An eccentric wheel (156) is provided at the bottom of the bearing plate (16). The output end of the second motor (155) is fixedly connected to the top of the eccentric wheel (156). A drive block (163) is slidably connected inside the sliding frame (153).

7. A multi-layer sampling device for soil analysis according to claim 6, characterized in that, The top of the drive block (163) is provided with an installation groove, the eccentric wheel (156) is fixedly connected in the installation groove, the outer side wall of the slide frame (153) is symmetrically rotatably connected with a connecting rod one (157), one end of the connecting rod one (157) is rotatably connected with a connecting rod two (158), one end of the connecting rod two (158) is rotatably connected with a connecting rod three (159), one end of the connecting rod three (159) is rotatably connected with a slider (162), the top of the base plate (1) is fixedly connected with an arc-shaped baffle plate (160), the side wall of the arc-shaped baffle plate (160) is provided with multiple sets of cutting grooves (161) at equal intervals, and the top of the arc-shaped baffle plate (160) is fixedly installed with a housing two (21).

8. A multi-layer sampling device for soil analysis according to claim 1, characterized in that, One of the supports (2) is fixedly mounted on the outside of a motor (17) for driving the threaded rod (4) to rotate. An external power supply (18) is provided on the top of the base plate (1). One end of the mounting bracket (5) is threadedly connected to the threaded rod (4), and the other end of the mounting bracket (5) is slidably connected to the guide rod (3).

9. A multi-level sampling method for soil analysis, employing a multi-level sampling device for soil analysis as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: First, start the auger drill (8). The auger drill (8) drills in the area to be sampled. After the drilling is completed, the hydraulic push rod 2 (702) drives the material taking component (9) into the hole, and under the action of the threaded rod (4), the feed port of the arc-shaped material holding frame (912) contacts the inner wall of the hole. Step 2: Motor 1 (906) drives the arc-shaped material holding frame (912) to rotate through the cooperation of the polygonal limit block (907) and the polygonal drive groove (914). The arc-shaped material holding frame (912) rotates out from the cover (908). During the rotation, the arc-shaped material holding frame (912) digs the soil on the inner side wall of the hole and puts the excavated soil into the arc-shaped material holding frame (912) until the feeding end of the arc-shaped material holding frame (912) contacts the sealing plate (910). At this time, the arc-shaped material holding frame (912) completes multi-layer sampling of the soil. Then, the hydraulic push rod 2 (702) takes the sampled soil out of the hole. Step 3: The electric gripper (13) removes the arc-shaped material container (912) containing soil along with the cover (908) from the vertical plate (902) and places it in the quick-freezing frame (14) for quick-freezing, so that the soil in the arc-shaped material container (912) is shaped. Step 4: The arc-shaped material holding frame (912) rotates and, under the action of the push plate (911), the soil sampled is detached from the arc-shaped material holding frame (912). Under the action of the electric gripper (13), the soil is pressed against the arc-shaped baffle plate (160). The cutter (150) in the cutting component (15) slices the frozen soil layer by layer through the cutting groove (161), thereby ensuring that the material of each soil layer does not mix with the material of other soil layers, thus preventing errors in sample analysis. Subsequently, the sliced ​​soil is placed one by one in the storage box and arranged in the corresponding storage box in order.

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