Obstacle cultivated land sampling device

Abstract

The utility model relates to the field of agricultural test appliances, in particular to an obstacle cultivated land sampling device which is characterized in that the lower section of a pipe cavity of an outer pipe is fixedly connected with a fixed pipe; an embedding groove is formed in the upper end opening of the fixing pipe in the circumferential direction, and the two side walls of the embedding groove converge and extend towards the axial lower portion and the radial inner side at the same time. The inner pipe is slidably arranged in the inner cavity of the outer pipe, and the inner pipe and the fixed pipe are coaxially arranged; the claw pieces are uniformly distributed along the circumference of the lower end opening of the inner pipe, and each claw piece is connected with the edge of the lower end opening of the inner pipe through an elastic bending part, so that the claw pieces have a centripetal recovery trend; the movable column body is axially and movably arranged in the inner pipe, and the outer peripheral surface of the movable column body is in sliding fit with the inner side wall of each claw piece; when the movable column body pushes the inner side wall of the claw piece to enable the claw piece to overcome the elastic restoring force to be opened, the front end of the opened claw piece can be embedded into the embedding groove to form a locking structure. And the cap is fixedly connected to the top end of the outer pipe.

Description

Technical Field

[0001] This utility model relates to the field of agricultural experimental instruments, specifically to a land sampling device for obstructed arable land. Background Technology

[0002] In agricultural experiments, soil heavy metal content detection is crucial for the safety assessment of obstacle farmland. Traditional soil sampling devices for obstacle farmland, such as long-tube samplers, while simple in structure, present numerous problems in practical application. For example, in the applicant's published document CN 2155918 U, the following defects were observed in actual use: the thick walls of the obstacle farmland sampling device result in a heavy overall weight of the sampling tube, making operation inconvenient. Furthermore, the large cross-sectional area makes insertion difficult and generates significant resistance, especially in soft or clayey soils. Additionally, the undulating design of the central hole obstructs soil flow, preventing smooth entry into the sampling tube. The undulating design also creates eddies in the soil flow, negatively impacting the soil's separation and mixing by the claws. This makes it difficult for some soil to enter the sampling tube in layers, affecting the accuracy of the sampling results. Simultaneously, soil movement to the claws interferes with them, causing deformation and jamming due to compression and friction, preventing proper closure and ultimately leading to sample leakage and contamination, further affecting the accuracy of the test results. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a soil sampling device for obstacle-prone farmland. This device features a simple and compact structure, reducing insertion resistance and improving sampling efficiency. During sampling, the soil enters the tube more smoothly, reducing soil flow resistance and ensuring successful entry into the sampling tube. Furthermore, it reduces interference from flowing soil on the sampling plates, ensuring complete and accurate sample collection.

[0004] The purpose of this utility model is achieved as follows: A soil sampling device for obstructed cultivated land, comprising:

[0005] The outer tube has a fixed tube fixedly connected to its lower section;

[0006] The upper end of the fixed tube is provided with a groove along the circumference, and the two side walls of the groove extend downward in the axial direction and inward in the radial direction, respectively.

[0007] The inner tube is slidably disposed in the inner cavity of the outer tube and is arranged coaxially with the fixed tube;

[0008] Multiple claws are evenly distributed around the circumference of the lower port of the inner tube. Each claw is connected to the edge of the lower port of the inner tube through an elastic bending part, so that the claw has a centripetal recovery tendency.

[0009] The movable column is axially movable inside the inner tube, and its outer circumferential surface forms a sliding fit with the inner sidewall of each claw piece; wherein, when the movable column pushes the inner sidewall of the claw piece to make the claw piece open against the elastic restoring force, the front end of the opened claw piece can be embedded in the groove to form a locking structure.

[0010] A cap is fixedly connected to the top of the outer tube. The cap has a through hole for the inner tube to pass through, and the cap is axially limited by the inner tube.

[0011] The cap and the outer tube are connected by threads, and the outer circumferential surface of the inner tube is provided with a limiting flange that forms an interference fit with the central through hole of the cap.

[0012] The fixed tube and the outer tube are integrally formed.

[0013] The inner tube has multiple strip-shaped sampling holes axially formed on its wall, with a spacing of 5 to 10 cm between adjacent sampling holes and a width of 2 to 3 mm for each sampling hole.

[0014] Symmetrically arranged grip handles are fixedly connected to the outer wall of the outer tube, and the surface of the handles is provided with anti-slip texture.

[0015] The outer tube, fixed tube, inner tube, and claw plates are all made of stainless steel.

[0016] The outer circumference of the front end of the outer tube and the fixed tube is provided with a guide slope, which gradually tapers downward along the axial direction.

[0017] The movable column is connected to a rod, which is fitted into the inner hole of the inner tube with a clearance fit. The far end of the rod extending out of the inner tube is fixedly connected to a limiting plate, which forms an axial limiting fit with the top end of the inner tube through a detachable connection structure.

[0018] The utility model has a simple and compact structure, which can reduce insertion resistance and improve sampling efficiency. During sampling, the soil enters the tube hole more smoothly, reducing soil flow resistance and ensuring that the soil enters the sampling tube smoothly. During sampling, it can reduce the interference of flowing soil on the claw plate and ensure that the sample is complete and accurate.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram showing the engagement state of the claw and the groove;

[0022] Figure 3 This is a schematic diagram of the groove structure;

[0023] Figure 4 for Figure 2 Schematic diagram of the open claw plate.

[0024] In the attached diagram, 1-outer tube; 2-fixed tube; 21-groove; 3-inner tube; 32-sample lifting hole; 4-claw; 41-elastic bending part; 5-movable column; 54-limiting flange; 52-conical head; 6-cap; 7-handle; 8-rod; 9-limiting plate; 11-guide slope. Detailed Implementation

[0025] Referring to the accompanying drawings, specific embodiments of the present invention will be described in detail.

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be understood that the terms center, upper, lower, front, back, left, right, vertical, horizontal, top, bottom, inner, and outer, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application 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 of this application. In the description of this application, the terms first and second 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 as first and second can be used to explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, multiple means two or more. It should be noted that in practical applications, due to limitations in equipment accuracy or installation errors, absolute parallelism or perpendicularity is difficult to achieve. The descriptions of vertical, parallel, or unidirectional in this application are not absolute limitations, but rather indicate that vertical or parallel structural settings can be achieved within a preset error range, and the corresponding preset effects can be achieved. In this way, the technical effects of the defined features can be maximized, and the corresponding technical solutions can be easily implemented, thus having high feasibility.

[0028] In the description of this specification, references to the terms "an embodiment," "some embodiments," "example," "specific example," or "some examples," 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, the 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] See Figures 1 to 4 An embodiment of a soil sampling device for obstructed farmland includes an outer tube 1, a fixed tube 2, an inner tube 3, multiple claw plates 4, a movable column 5, and a cap 6. The lower section of the outer tube 1 is fixedly connected to the fixed tube 2, and the top end of the outer tube 1 is fixedly connected to the cap 6. Symmetrical handles 7 are provided on the outer wall of the outer tube 1, and the handle surface has anti-slip textures to provide a good grip and anti-slip effect during operation. A guide slope 11 may be provided on the outer periphery of the front end of the outer tube 1. The guide slope 11 gradually tapers axially towards the rod end, which helps to reduce resistance during sampling and improve sampling efficiency.

[0030] The upper end of the fixed tube 2 is provided with a groove 21 along the circumference. The two side walls of the groove 21 extend downward in the axial direction and inward in the radial direction, respectively. This design allows the claws 4 to better embed into the groove 21 after opening, forming a stable locking structure. During sampling, the claws 4 open and fit against the wall of the outer tube 1. The corresponding cross-section at this point can be small, and the tube wall of the entire device is thin, resulting in less insertion resistance. At the same time, the entire tube cavity is relatively straight and unobstructed, resulting in less resistance during sampling. The gaps between the claws 4 are filled by the protrusions between the grooves, making it difficult for soil to enter the space between the claws 4, thus minimizing soil interference. The fixed tube 2 can be integrally formed with the outer tube 1, ensuring the stability and strength of the structure; or it can be connected by threaded connection or welding. The outer periphery of the front end of the fixed tube 2 can also be provided with a guide slope 11, which gradually tapers downward in the axial direction.

[0031] The inner tube 3 is slidably disposed within the inner cavity of the outer tube 1 and is coaxially arranged with the fixed tube 2. Multiple strip-shaped sampling holes 32 are axially formed on the wall of the inner tube 3, with a spacing of 5-10 cm between adjacent sampling holes 32 and a width of 2-3 mm. This facilitates the horizontal placement of the inner tube 3 during the later stages of the sampling process, making sample extraction easier. The inner tube 3 can be made of stainless steel to ensure corrosion resistance and strength.

[0032] Multiple claw plates 4 are evenly distributed around the lower end of the inner tube 3. Each claw plate 4 is connected to the edge of the lower end of the inner tube 3 through an elastic bending part 41, giving the claw plate 4 a centripetal return tendency. The number of claw plates 4 can be adjusted according to actual needs. The claw plates 4 can be made of stainless steel. Of course, the outer tube 1, the fixed tube 2, the inner tube 3, and the claw plates 4 are all made of stainless steel. Stainless steel has good corrosion resistance and mechanical strength, and can work stably in various harsh environments. When the movable column 5 pushes the inner wall of the claw plate 4, the claw plate 4 overcomes the elastic return force and opens, and the front end can be embedded in the groove 21 of the fixed tube 2 to form a locking structure. The claw plate 4 can conform to the shape of the groove, and the two side walls of the claw plate 4 simultaneously converge and extend axially downward and radially inward, respectively.

[0033] The movable column 5 is axially movable within the inner tube 3, and its outer circumferential surface forms a sliding fit with the inner sidewall of each claw plate 4. After the movable column 5 opens the claw plates 4, it can enter the groove 21. The movable column 5 can be removed, or during sampling, the soil pushes the movable column 5 out.

[0034] The movable column 5 is pushed manually or electrically. Furthermore, the movable column 5 is connected to a rod 8, which is fitted into the inner hole of the inner tube 3 with a clearance fit. The movable column 5, extending into the inner tube 3, can be manipulated via the rod 8. The rod 8 is lightweight and does not rub against the inner tube 3, resulting in minimal resistance. A limiting disc 9 can be fixedly connected to the distal end of the rod 8 extending from the inner tube 3. The limiting disc 9, through a detachable connection structure such as a pin connection, forms an axial limiting fit with the top end of the inner tube 3. This method facilitates the pre-assembly of the inner tube 3 and the movable column 5, forming a stable overall structure that maintains the column in a stable position within the tube.

[0035] The cap 6 is fixedly connected to the top of the outer tube 1. The cap 6 has a through hole for the inner tube 3 to pass through. The cap 6 and the inner tube 3 are axially limited to prevent the inner tube 3 from passing through during sampling, thus ensuring the stability of the locking structure. Specifically, the cap 6 and the outer tube 1 are connected by threads. The outer circumferential surface of the inner tube 3 is provided with a limiting flange 54 that forms an interference fit with the central through hole of the cap 6. The inner tube 3 is pressed together by the cooperation between the limiting flange 54 and the cap 6.

[0036] Using the above scheme, the inner tube 3 is first inserted into the outer tube 1. The movable column 5 is then placed into the inner tube 3 via the rod 8. The outer circumference of the movable column 5 forms a sliding fit with the inner wall of the claw 4, pushing the claw 4 to overcome the elastic restoring force of the elastic bending part 41 and open outwards. When the claw 4 opens to a suitable extent, the inner tube 3 is further pushed so that the front end of the claw 4 is embedded in the groove 21 at the upper end of the fixed tube 2. Since the two side walls of the groove 21 extend axially downwards and radially inwards simultaneously, the claw 4 can be better embedded in the groove 21, forming a stable locking structure. Alternatively, the limiting plate 9 connected to the far end of the rod 8 extending from the inner tube 3 can be fixedly connected to the inner tube 3, so that the limiting plate 9 and the top end of the inner tube 3 form an axial limiting fit. The assembled inner tube 3 is then inserted into the inner cavity of the outer tube 1 through the cap 6. After the cap 6 is fixed to the top of the outer tube 1 by threaded connection, the cap 6 and the inner tube 3 are axially limited to form a stable locking structure. At this time, the movable column 5 can be retracted or pulled out. The claw plate 4 is still in the locked state. The operator holds the handle 7 and moves the obstacle farmland soil sampling device to the obstacle farmland position to be sampled, so that the lower end of the outer tube 1 is aligned with the sampling point and pressed down to sample. After sampling, the axial limitation between the inner tube 3 and the outer tube 1 is released first. After the inner tube 3 is retracted a small distance, the locking of the claw plate 4 can be released. The claw plate 4 moves towards the center and grips the soil at the lower end of the inner tube 3. After the soil is gripped, it is not easy to fall out. The soil in the entire inner tube 3 can be taken out. Of course, the claw plate 4 can be designed to be completely closed after closing, which can be suitable for more application scenarios. In particular, soil with low soil viscosity can be sampled in the sampling hole 32 after being laid flat.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An obstacle ploughed land soil sampling device, characterised in that, The utility model relates to a kind of medical device, including: Outer tube (1), fixedly connected with fixed pipe (2) in lower section of lumen; The upper end of the fixed pipe (2) is provided with an embedding groove (21) along the circumference, and the two side walls of the embedding groove (21) extend downward and radially inward simultaneously. Inner tube (3), slidably disposed in the inner cavity of the outer tube (1), and coaxially arranged with the fixed pipe (2); A plurality of claw pieces (4) are evenly distributed along the circumference of the lower end of the inner tube (3), and each claw piece (4) is connected to the edge of the lower end of the inner tube (3) by a resilient bending portion (41), so that the claw piece (4) has a centripetal recovery tendency. Movable cylinder (5), axially movably disposed in the inner tube (3), the outer circumferential surface of which forms a sliding fit with the inner side wall of each claw piece (4); wherein, when the movable cylinder (5) pushes the inner side wall of the claw piece (4) to make the claw piece (4) overcome the elastic recovery force and open, the front end of the open claw piece (4) can be embedded in the embedding groove (21) to form a locking structure. Cap (6), fixedly connected to the top end of the outer tube (1), the cap (6) is provided with a through hole for the inner tube (3) to pass through, and the cap (6) is axially limited with the inner tube (3).

2. An obstacle ploughed land sampling apparatus according to claim 1, characterised in that, The cap (6) and the outer tube (1) are connected by threads, and the outer circumferential surface of the inner tube (3) is provided with a limiting flange (54) that interferes with the central through hole of the cap (6).

3. The obstructed farmland land sampling apparatus of claim 1, wherein, The fixed pipe (2) and the outer tube (1) are integrally formed.

4. The obstructed farmland land sampling apparatus of claim 1, wherein, A plurality of strip sampling holes (32) are axially formed on the tube wall of the inner tube (3), the distance between adjacent sampling holes (32) is 5-10 cm, and the width of the sampling hole (32) is 2-3 mm.

5. The barrier plowed land sampling apparatus of claim 1, wherein, The outer wall of the outer tube (1) is fixedly connected with symmetrically arranged holding handles (7), and the surface of the handle is provided with anti-skid lines.

6. The obstacle plowed land sampling apparatus of claim 1, wherein, The outer tube (1), the fixed pipe (2), the inner tube (3) and the claw piece (4) are all made of stainless steel.

7. The barrier plowed land sampling apparatus of claim 1, wherein, The outer circumferences of the front ends of the outer tube (1) and the fixed pipe (2) are provided with guide inclined surfaces (11) that taper downward along the axial direction.

8. The barrier plowed land sampling apparatus of claim 1, wherein, The movable cylinder (5) is connected to a rod (8), the rod (8) is clearance-fitted in the inner hole of the inner tube (3), the distal end of the rod (8) extending out of the inner tube (3) is fixedly connected with a limiting disc (9), and the limiting disc (9) is axially limited with the top end of the inner tube (3) by a detachable connecting structure.

9. The barrier plowed land sampling apparatus of claim 1, wherein, The claw piece and the embedding groove are profiled, and the two side walls of the claw piece extend downward and radially inward simultaneously.

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