An agricultural soil sampling device

Abstract

The utility model belongs to soil sampling technical field especially relates to an agricultural soil sampling device, including support platform, the upper surface symmetry of support platform and is close to rear side position department fixed mounting is to the support arm of the shape of the character, the support arm in sliding installation has the support plate, the lower surface symmetry of support arm is fixed with hydraulic pressure jar, the telescopic rod bottom of hydraulic pressure jar and the upper surface of support plate are fixed, install soil sampling mechanism on the support plate, through setting up soil sampling mechanism, two sampling tubes are the design of folding, can freely separate after completing to soil sampling, solved the shortcoming that traditional sampling device is inconvenient to take out the soil or is easy to cause sudden dispersion in the process of taking out, and the device effectively guarantees the integrity of sampling soil.

Description

Technical Field

[0001] This utility model belongs to the field of soil sampling technology, and in particular relates to an agricultural soil sampling device. Background Technology

[0002] Agricultural soil sampling is a crucial step in obtaining soil physicochemical property data for agricultural production and research. Its accuracy and efficiency directly affect soil fertility assessment, precision fertilization decisions, and crop planting planning. Currently, the manual soil samplers widely used in the agricultural field generally suffer from the following problems: First, the sampling process relies on repeated manual insertion and removal, especially in clay soils or gravelly soil layers, where the sampling tube is easily clogged by soil particles, resulting in compromised sample integrity and difficulty in extraction. This requires a significant amount of time to clean the equipment, severely reducing fieldwork efficiency. For example, traditional semi-cylindrical samplers are prone to layer mixing during stratified sampling, while full-cylindrical samplers are difficult to completely expel samples due to high friction between the soil and the inner wall, requiring tools to forcibly peel them off. This not only damages the original soil structure but may also introduce human-caused contamination.

[0003] Secondly, existing devices generally lack precise depth control mechanisms, relying primarily on operator experience to determine sampling depth, which is susceptible to interference from changes in soil hardness. For example, in farmland with uneven texture, manual pressure makes it difficult to ensure consistent sampling depth each time, leading to a lack of comparability between different samples and affecting the accuracy of subsequent spatial variation analysis of soil nutrients. Furthermore, manual operation suffers from poor stability, especially when sampling multiple points in large-scale farmland, requiring multiple people to collaborate on drilling, sampling, and recording processes, resulting in high labor costs and low efficiency. In addition, traditional samplers have limited functionality and cannot simultaneously meet the needs of stratified soil sampling at different depths, preservation of undisturbed soil samples, and rapid switching of sampling specifications, making them ill-suited to the development trends of digital and refined management in modern agriculture. For instance, in soil testing and fertilizer recommendation scenarios, data deviations caused by uneven sampling point distribution or insufficient sample volume may cause fertilization plans to deviate from actual needs, affecting crop yield and soil ecological balance. Therefore, we propose an agricultural soil sampling device. Utility Model Content

[0004] The purpose of this invention is to provide an agricultural soil sampling device to solve the problems mentioned in the background art.

[0005] In view of this, the present invention provides an agricultural soil sampling device, comprising: A support platform is provided, on the upper surface of the support platform and near the rear side, a U-shaped support arm is fixedly installed, a support plate is slidably installed inside the support arm, hydraulic cylinders are symmetrically fixed on the lower surface of the support arm, the bottom end of the telescopic rod of the hydraulic cylinder is fixed to the upper surface of the support plate, and a soil sampling mechanism is installed on the support plate. A mobile positioning component is disposed on the lower surface of the support platform and is used to assist the support platform in moving or positioning itself above the soil. A pull rod is rotatably mounted at the front of the support platform. A limit assembly is symmetrically provided between the bottom of the pull rod and the support platform. The limit assembly is used to limit the rotation direction of the pull rod. The scale line is fixedly set on one side of the front wall of the support arm, and a pointer is fixedly installed on the front wall of the support plate near the scale line.

[0006] In this technical solution, the soil sampling mechanism includes: The motor is fixedly mounted on the upper surface of the support plate, and a transmission rod is rotatably mounted on the lower surface of the support plate. The output shaft of the support plate is coaxially fixed with the transmission rod. A nut is fixedly mounted on the bottom end of the transmission rod. A sampling tube with a semi-circular structure is provided on the lower surface of the nut. The top ends of the two sampling tubes are threaded into the threaded grooves at the bottom of the nut, and a drill bit is threaded to the bottom ends of the two sampling tubes.

[0007] In this technical solution, multiple drill teeth are fixedly installed on the lower surface of the drill bit at both the inner and outer sides, arranged in an alternating pattern.

[0008] In this technical solution, the mobile positioning component includes: Two support legs are symmetrically and fixedly installed on the lower surface of the support platform near the front side. The bottom end of each support leg is fixedly installed with a caster wheel. Electric push rods are symmetrically fixed on the lower surface of the support platform near the rear side. The bottom end of the telescopic rod of each electric push rod is provided with a positioning cone.

[0009] In this technical solution, a mudguard is provided between the electric push rod and the positioning cone. The upper and lower surfaces of the mudguard are fixed to the bottom end of the electric push rod and the top end of the positioning cone, respectively. The diameter of the mudguard is 5-15 cm.

[0010] In this technical solution, multiple grips are fixedly installed on the rear side wall and the left and right side surfaces of the support arm, and a rectangular groove is opened on the upper surface of the support arm, in which a level is fixedly installed.

[0011] In this technical solution, the limiting component includes: The protrusion is fixedly installed at the axis at the bottom of the pull rod. The upper surface of the support platform is provided with a rotating groove that can accommodate the rotation of the pull rod. The inner wall of the rotating groove is symmetrically provided with circular grooves that are adapted to the protrusion. The circumferential side wall of the protrusion is provided with a sliding groove. A limiting block with a T-shaped cross-section is slidably installed in the sliding groove, and the other end of the limiting block passes through the sliding groove and extends to the outside. A spring is provided in the sliding groove. A thread is provided at the opening of the sliding groove. A fastening knob is threaded at the opening of the sliding groove. The circumferential side wall of the circular groove is provided with multiple limiting holes that are evenly distributed in a circle.

[0012] The beneficial effects of this utility model are: 1. This agricultural soil sampling device, by setting up a soil sampling mechanism, has two sampling tubes designed to be joined together. After the soil sampling is completed, they can be freely separated, which solves the shortcomings of traditional sampling devices that are not convenient to remove the soil or are prone to sudden dispersion during the removal process. This device effectively ensures the integrity of the sampled soil.

[0013] 2. This agricultural soil sampling device, by setting scale lines and pointers, allows the sinking distance of the soil sampling mechanism to be observed during the sinking sampling process. This solves the problem that traditional soil sampling devices cannot guarantee consistent sampling depth each time, effectively ensuring the comparability between different samples and not affecting the accuracy of subsequent spatial variation analysis of soil nutrients.

[0014] 3. This agricultural soil sampling device can be operated by a single person and is easy to fix, disassemble, move and position. It solves the shortcomings of poor device stability and high labor costs in the sampling process of traditional manual devices. At the same time, it improves the problem of the single function of traditional samplers and meets the needs of soil stratification sampling at different depths, preservation of original soil samples and rapid switching of sampling specifications. It can adapt to the development trend of digital and refined management in modern agriculture. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is a schematic diagram of the sampling tube in this utility model; Figure 4 This is a schematic diagram of the drill bit structure in this utility model; Figure 5 This is one of the structural schematic diagrams of the limiting component in this utility model; Figure 6 This is the second structural schematic diagram of the limiting component in this utility model.

[0016] The markings in the diagram are as follows: 1. Support platform; 2. Support arm; 3. Support plate; 4. Hydraulic cylinder; 5. Motor; 6. Transmission rod; 7. Nut; 8. Sampling tube; 9. Drill bit; 10. Drill teeth; 11. Support leg; 12. Caster wheel; 13. Electric push rod; 14. Mudguard; 15. Positioning cone; 16. Handle; 17. Rectangular groove; 18. Level; 19. Scale line; 20. Pointer; 21. Pull rod; 22. Rotary groove; 23. Circular groove; 24. Limiting hole; 25. Protrusion; 26. Slide groove; 27. Limiting block; 28. Spring; 29. ​​Fastening knob. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0018] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0019] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0021] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0022] Example 1: Please see Figure 1 - Figure 6 As shown, this embodiment provides an agricultural soil sampling device, including: A support platform 1 is provided. A U-shaped support arm 2 is fixedly installed on the upper surface of the support platform 1 near the rear side. A support plate 3 is slidably installed inside the support arm 2. A hydraulic cylinder 4 is symmetrically fixed on the lower surface of the support arm 2. The bottom end of the telescopic rod of the hydraulic cylinder 4 is fixed to the upper surface of the support plate 3. A soil sampling mechanism is installed on the support plate 3. A mobile positioning component is disposed on the lower surface of the support platform 1 and is used to assist the support platform 1 in moving or positioning itself above the soil. A pull rod 21 is rotatably mounted on the front side of the support platform 1. A limit component is symmetrically provided between the bottom of the pull rod 21 and the support platform 1. The limit component is used to limit the rotation direction of the pull rod 21. The scale line 19 is fixedly set on one side of the front wall of the support arm 2, and the pointer 20 is fixedly installed on the front wall of the support plate 3 near the scale line 19. In this embodiment, the soil sampling device includes: Motor 5 is fixedly installed on the upper surface of support plate 3. A transmission rod 6 is rotatably installed on the lower surface of support plate 3. The output shaft of support plate 3 is coaxially fixed with transmission rod 6. A nut 7 is fixedly installed at the bottom end of transmission rod 6. A sampling tube 8 with a semi-circular structure is provided on the lower surface of nut 7. The top ends of the two sampling tubes 8 are threadedly engaged with the threaded groove at the bottom of nut 7. A drill bit 9 is threadedly connected to the bottom end of the two sampling tubes 8.

[0023] In use, the device is pulled to the location where soil sampling is required by the pull rod 21. Then, the device is straightened and the electric push rod 13 in the moving positioning component is activated, so that the positioning cone 15 is inserted into the soil. Then, the support arm 2 is pressed down so that the main body of the device is stably inserted into the ground. Then, the two hydraulic cylinders 4 are activated, and the telescopic rods of the two hydraulic cylinders 4 are moved downward and push the support plate 3 to slide downward. The support plate 3 drives the soil sampling mechanism to insert into the soil to complete the soil collection. Then, the hydraulic cylinders 4 are activated in reverse to pull the soil sampling mechanism out of the soil. Then, the sampled soil is collected. During collection, rotate the sampling tube 8 to remove the two sampling tubes 8 from the nut 7, and then unscrew the drill bit 9. At this point, the two sampling tubes 8 can be separated to the outside. The soil sampled is well preserved, and the operator can collect it using a sampling box. It is worth noting that the telescopic rods of the two hydraulic cylinders 4 are in the same state and have the same length. In the initial state, the support plate 3 is flat. The inner wall of the support arm 2 is provided with a moving groove that slides with the support plate 3. In addition, the two sets of electric push rods 13 are in the same initial state and have the same running trajectory. A synchronization control module is provided between the two hydraulic cylinders 4 and the two electric push rods 13 to ensure the synchronization of their movement. During the sampling process, the pointer 20 on the support plate 3 will continuously move downwards. The operator can observe the scale line 19 to determine the depth of the soil sampling. When collecting soil from multiple regions, it can effectively ensure that the depth of each soil collection is consistent, thereby ensuring accurate comparison of soil samples at different depths in multiple sampling experiments. It is worth noting that the two sampling tubes 8 in this application can be made with different inner diameters depending on specific needs, thereby increasing the applicability of this device.

[0024] By incorporating a soil sampling mechanism with two sampling tubes 8 arranged in a closed manner, the soil can be freely separated after sampling, overcoming the shortcomings of traditional sampling devices that are inconvenient to remove soil or prone to sudden dispersion during the removal process. This device effectively ensures the integrity of the sampled soil. The inclusion of a scale line 19 and a pointer 20 allows for observation of the sinking distance of the soil sampling mechanism during the sampling process, solving the problem of traditional soil sampling devices failing to guarantee consistent sampling depth each time. This effectively ensures the comparability between different samples and does not affect the accuracy of subsequent spatial variation analysis of soil nutrients. Furthermore, this device can be operated by a single person, facilitating fixing, disassembly, movement, and positioning. It overcomes the shortcomings of traditional manual sampling devices, such as poor device stability and high labor costs, while also improving the limited functionality of traditional samplers. It simultaneously meets the needs of stratified soil sampling at different depths, preservation of undisturbed soil samples, and rapid switching of sampling specifications, adapting to the development trend of digital and refined management in modern agriculture.

[0025] Example 2: This embodiment provides an agricultural soil sampling device, which, in addition to the technical solution of the above embodiment, also has the following technical features: multiple drill teeth 10 are fixedly installed on the lower surface of the drill bit 9 at both the inner and outer sides, arranged in an alternating manner.

[0026] Among them, reference Figure 4 The outer ring of multiple drill teeth 10 and the inner ring of multiple drill teeth 10 are staggered to form a saw-like structure. When the motor 5 is working, the output shaft of the motor 5 will drive the transmission rod 6 and the soil sampling mechanism located below the transmission rod 6 to rotate. At this time, the nut 7, the sampling tube 8 and the drill bit 9 start to rotate. When the drill bit 9 rotates, the inner and outer layers of drill teeth 10 below the drill bit 9 will cut the soil below, thereby reducing the resistance for the sampling tube 8 to be inserted into the soil, reducing the working intensity of the hydraulic cylinder 4, and effectively improving the service life of the device.

[0027] By setting the drill teeth 10, this device can more easily complete the soil sampling work.

[0028] Example 3: This embodiment provides an agricultural soil sampling device, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including a mobile positioning component: Two support legs 11 are symmetrically fixedly installed on the lower surface of the support platform 1 near the front side. Universal wheels 12 are fixedly installed at the bottom end of the support legs 11. Electric push rods 13 are symmetrically fixed on the lower surface of the support platform 1 near the rear side. The bottom end of the telescopic rod of the electric push rod 13 is provided with a positioning cone 15.

[0029] When the device moves, the two casters 12 are in contact with the ground, the retractable rod of the electric push rod 13 is in a retracted state, the two electric push rods 13 have the same initial state and running trajectory, and are equipped with a synchronous control module to drive the two electric push rods 13 at the same time. At this time, the positioning cone 15 is off the ground. The operator can use the pull rod 21 to make the device move by rolling the two casters 12. During the pulling process, in order to prevent the support platform 1 or support arm 2 from tilting backward, the operator can support the support arm 2 by hand or pass a rope through the opening on the support arm 2 and the pull rod 21. During use, the two grips 16 on the left and right side walls of the support arm 2 can be used as force points. In order to facilitate the understanding of those skilled in the art, the principle of the device during the movement process can be similar to the working principle of a handcart. During positioning, two electric push rods 13 are activated simultaneously. The two electric push rods 13 drive the positioning cone 15 to move downward and insert into the ground. At this time, hold the support arm 2 with your hand to ensure that the support arm 2 is perpendicular to the ground. As the telescopic rod of the electric push rod 13 extends continuously, the caster wheel 12 gradually separates from the ground. When the caster wheel 12 is 3-5 cm off the ground, stop the electric push rod 13.

[0030] By incorporating a mobile positioning component, this device can be easily moved and fixed above the soil.

[0031] Example 4: This embodiment provides an agricultural soil sampling device. In addition to the technical solutions of the above embodiments, it also has the following technical features: a mudguard 14 is provided between the electric push rod 13 and the positioning cone 15. The upper and lower surfaces of the mudguard 14 are fixed to the bottom end of the electric push rod 13 and the top end of the positioning cone 15, respectively. The diameter of the mudguard 14 is in the range of 5-15 cm.

[0032] The mudguard 14 can block the soil below during the insertion of the positioning cone 15 into the ground, which can effectively prevent the soil from having an adverse effect on the telescopic rod of the electric push rod 13.

[0033] By setting up the mudguard 14, the electric push rod 13 is well protected.

[0034] Example 5: This embodiment provides an agricultural soil sampling device, which, in addition to the technical solution of the above embodiment, also has the following technical features: multiple handles 16 are fixedly installed on the rear side wall and the left and right side surfaces of the support arm 2, and a rectangular groove 17 is opened on the upper surface of the support arm 2, and a level 18 is fixedly installed in the rectangular groove 17.

[0035] When the positioning cone 15 is inserted into the soil, in order to ensure that the support platform 1 is completely inserted into the ground through the positioning cone 15, multiple grips 16 can be used. The operator presses down on the grips 16 and makes the device nail to the ground. During the process, the level 18 can be observed to ensure that the device is in a vertical state. If one side is too high, the grip 16 on that side is pressed down. In conjunction with embodiment 3, when retrieving the positioning cone 15, the operator can push the device so that the caster wheel 12 contacts the ground. Using the caster wheel 12 as the force point, the retraction rod of the electric push rod 13 can bring the positioning cone 15 out of the soil during the retrieval process.

[0036] By setting the level 18, it is possible to effectively ensure that the device is in a vertical state during the soil sampling process, thus ensuring the accuracy of the stratified samples obtained by the device.

[0037] Example 6: This embodiment provides an agricultural soil sampling device, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including a limiting component: The protrusion 25 is fixedly installed at the axis at the bottom of the pull rod 21. The upper surface of the support platform 1 is provided with a rotating groove 22 that can accommodate the rotation of the pull rod 21. The inner wall of the rotating groove 22 is symmetrically provided with circular grooves 23 that are adapted to the protrusion 25. The circumferential side wall of the protrusion 25 is provided with a sliding groove 26. A limiting block 27 with a T-shaped cross-section is slidably installed in the sliding groove 26, and the other end of the limiting block 27 passes through the sliding groove 26 and extends to the outside. A spring 28 is provided in the sliding groove 26. A thread is provided at the opening of the sliding groove 26. A fastening knob 29 is threaded at the opening of the sliding groove 26. The circumferential side wall of the circular groove 23 is provided with multiple limiting holes 24 that are evenly distributed in a circle.

[0038] In order to adjust the rotation angle of the pull rod 21 so that the operator can pull the device more effortlessly, the pull rod 21 can be rotated forcefully, so that the pull rod 21 rotates in the rotating groove 22. Since the top of the limiting block 27 is hemispherical, when the force is greater than the friction between the limiting block 27 and the limiting hole 24, the limiting block 27 will be pressed into the sliding groove 26 and squeeze the spring 28. After rotating to a suitable angle, the limiting block 27 falls back into the new limiting hole 24 under the elastic action of the spring 28 and re-constrains the pull rod 21.

[0039] By setting a limit component, it is easy to adjust the direction of the lever 21 and maintain the adjusted state after adjustment.

[0040] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An agricultural soil sampling device, characterized in that, include: A support platform (1) is provided. A U-shaped support arm (2) is fixedly installed on the upper surface of the support platform (1) and near the rear side. A support plate (3) is slidably installed inside the support arm (2). A hydraulic cylinder (4) is symmetrically fixed on the lower surface of the support arm (2). The bottom end of the telescopic rod of the hydraulic cylinder (4) is fixed to the upper surface of the support plate (3). A soil sampling mechanism is installed on the support plate (3). A mobile positioning component is disposed on the lower surface of the support platform (1) and is used to assist the support platform (1) in moving or positioning itself above the soil. A pull rod (21) is rotatably mounted on the front side of the support platform (1). A limit assembly is symmetrically arranged between the bottom of the pull rod (21) and the support platform (1). The limit assembly is used to limit the rotation direction of the pull rod (21). The scale line (19) is fixedly set on one side of the front wall of the support arm (2), and the pointer (20) is fixedly installed on the front wall of the support plate (3) near the scale line (19).

2. The agricultural soil sampling device according to claim 1, characterized in that, The soil sampling device includes: The motor (5) is fixedly installed on the upper surface of the support plate (3). A transmission rod (6) is rotatably installed on the lower surface of the support plate (3). The output shaft of the support plate (3) is coaxially fixed with the transmission rod (6). A nut (7) is fixedly installed at the bottom end of the transmission rod (6). A sampling tube (8) with a semi-circular structure is provided on the lower surface of the nut (7). The top ends of the two sampling tubes (8) are threadedly engaged with the threaded groove at the bottom of the nut (7). A drill bit (9) is threadedly connected to the bottom end of the two sampling tubes (8).

3. The agricultural soil sampling device according to claim 2, characterized in that, The drill bit (9) has multiple drill teeth (10) fixedly installed on the inner and outer sides of its lower surface in an alternating manner.

4. The agricultural soil sampling device according to claim 1, characterized in that, The mobile positioning component includes: Two support legs (11) are symmetrically fixedly installed on the lower surface of the support platform (1) near the front side. The bottom end of the support leg (11) is fixedly installed with a caster wheel (12). The lower surface of the support platform (1) is symmetrically fixed with an electric push rod (13) near the rear side. The bottom end of the telescopic rod of the electric push rod (13) is provided with a positioning cone (15).

5. An agricultural soil sampling device according to claim 4, characterized in that, A mudguard (14) is provided between the electric push rod (13) and the positioning cone (15). The upper and lower surfaces of the mudguard (14) are fixed to the bottom end of the electric push rod (13) and the top end of the positioning cone (15), respectively. The diameter of the mudguard (14) is 5-15 cm.

6. An agricultural soil sampling device according to claim 1, characterized in that, Multiple grips (16) are fixedly installed on the rear side wall and the left and right side surfaces of the support arm (2). A rectangular groove (17) is opened on the upper surface of the support arm (2), and a level (18) is fixedly installed in the rectangular groove (17).

7. An agricultural soil sampling device according to claim 1, characterized in that, The limiting component includes: The protrusion (25) is fixedly installed at the axis at the bottom end of the pull rod (21). The upper surface of the support platform (1) is provided with a rotating groove (22) that can accommodate the rotation of the pull rod (21). The inner wall of the rotating groove (22) is symmetrically provided with a circular groove (23) that matches the protrusion (25). The circumferential side wall of the protrusion (25) is provided with a sliding groove (26). A limiting block (27) with a T-shaped cross-section is slidably installed in the sliding groove (26). The other end of the limiting block (27) passes through the sliding groove (26) and extends to the outside. A spring (28) is provided in the sliding groove (26). A thread is provided at the opening of the sliding groove (26). A fastening knob (29) is threaded at the opening of the sliding groove (26). A plurality of limiting holes (24) are provided on the circumferential side wall of the circular groove (23) at equal intervals.

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