Agricultural soil heavy metal detection equipment and detection method

Abstract

The invention relates to agricultural soil heavy metal detection equipment and a detection method, and relates to the technical field of soil heavy metal detection. Comprising a fixed cylinder, a material taking cylinder is slidably arranged in the fixed cylinder in the height direction of the fixed cylinder, and a material taking assembly used for being matched with the material taking cylinder to enter soil and take soil is arranged in the fixed cylinder; the storage assembly is used for carrying out sample separation on the soil; the material taking assembly comprises a material taking auger rotationally arranged in the material taking barrel. According to the invention, the following problems in the soil heavy metal detection process in the prior art can be solved: the descending depth of the material taking auger can be accurately controlled, soil at a specific depth can be collected as required, the same number of samples at different depths can be taken, and subsequent mixing of soil at multiple depths is supported. The inner barrel rotates along with the material taking auger, the outer barrel is fixed by the limiting column, and saw-toothed bumps at the bottoms of the inner barrel and the outer barrel form shearing force, so that hard soil blocks in a sampling path can be broken, and vertical sample cavities caused by soil block blocking are prevented.

Description

Technical Field

[0001] This invention relates to the technical field of heavy metal detection in soil, and particularly to a heavy metal detection device and method for agricultural soil. Background Technology

[0002] Heavy metal pollution in agricultural soils is a major challenge to the global agricultural ecosystem. Heavy metals migrate and accumulate through the soil-to-crop system, not only reducing soil fertility and inhibiting crop growth, but also entering the human body through agricultural products, causing health risks such as chronic poisoning, organ damage, and even cancer. Therefore, rapid, accurate, and efficient detection of heavy metal content in agricultural soils is a crucial prerequisite for implementing soil pollution control, ensuring agricultural product safety, and protecting human health.

[0003] In existing agricultural soil sampling techniques, sampling tubes or sampling cylinders are commonly inserted into the soil for sampling. While this method can meet certain sampling needs, it has significant limitations: due to soil compaction, and the varying degrees of compaction at different locations, it is often difficult for the soil to fully fill the tube when the sampling tube is inserted deep into the soil. This is especially problematic when collecting soil samples at different depths to integrate vertical soil information, resulting in sufficient samples at some depths and severely insufficient samples at others, sometimes even leading to empty sections in the sampling tube. This uneven sample size directly affects the representativeness of soil information at each depth in subsequent testing, thus interfering with the accurate assessment of the overall soil condition and reducing the reliability of the test results.

[0004] Chinese patent CN116593205A discloses a soil testing instrument, including a supporting shell with a support frame on its outer wall, the supporting shell and the support frame being interchangeable; a drilling cylinder fixed to the bottom of the supporting shell; and a soil sampling component disposed inside the drilling cylinder. The soil sampling component includes a positioning cylinder that slides with the drilling cylinder, the top of which extends into the supporting shell, and a drill bit fixed to the bottom of the positioning cylinder. A sampling element is disposed inside the positioning cylinder, having a sampling end that rotates relative to the positioning cylinder. A slot is formed on the side wall of the positioning cylinder, through which the sampling end extends out of the positioning cylinder, and the drilling cylinder seals the slot. The sampling element includes a sampling tube that slides with the positioning cylinder, with an opening at the top of the positioning cylinder. One end of the sampling tube extends through the opening out of the supporting shell. Locking devices are correspondingly provided on the supporting shell and the sampling tube, fixing the sampling tube to the supporting shell via the locking devices. This effectively improves testing efficiency and soil testing accuracy.

[0005] However, the aforementioned soil testing instruments still have some shortcomings in actual use: 1. Sampling is carried out through a sampling tube, but there are compacted soil clods in the soil. If the tube is blocked by soil clods when it is inserted, it will not be able to be completely filled. This is especially true when a large amount of sample needs to be collected and the soil is dry. The sampling work of the sampling tube is more easily affected by large soil clods.

[0006] 2. Current technologies can only sample soil at a single depth. However, natural soil forms distinct vertical stratification over a long period, with significant differences in physical and chemical properties and pollution accumulation at different depths. Taking samples from only a single depth may miss pollution information from deeper soil layers, leading to misjudgments of the overall pollution level.

[0007] Therefore, based on the above-stated viewpoints, it is of great significance to improve and refine existing technologies, which can not only reduce the impact of soil clods on sampling, but also enable sampling and testing of soil at different depths, ensuring the accuracy of test results. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides an agricultural soil heavy metal detection device and method.

[0009] On one hand, an agricultural soil heavy metal detection device includes a fixed cylinder, inside which a sampling cylinder is slidably disposed along its height direction, and inside the fixed cylinder is a device for cooperating with the sampling cylinder. The material extraction components that enter the soil and extract soil.

[0010] A storage component for separating soil samples.

[0011] The material handling assembly includes a material handling auger that is rotatably disposed inside the material handling cylinder and extends to the outside of the material handling cylinder.

[0012] The material receiving cylinder includes an inner cylinder and an outer cylinder, and serrated protrusions are equally spaced at the bottom of both the inner and outer cylinders.

[0013] Preferably, an installation ring is fitted on the top of the inner cylinder, and a receiving groove is opened on the inner wall of the outer cylinder, with the installation ring rotatably positioned in the receiving groove.

[0014] Preferably, limit posts are symmetrically installed inside the fixed cylinder, and positioning plates are symmetrically arranged on the outer cylinder and sleeved on the positioning posts.

[0015] Preferably, a drive screw is symmetrically installed inside the fixed cylinder, and an arc-shaped plate is slidably installed on the outside of the outer cylinder. The two ends of the arc-shaped plate are threadedly connected to the drive screw, and a mating block is symmetrically arranged on the top of the outer cylinder. The mating block and the arc-shaped plate move in contact.

[0016] Preferably, the storage component includes a processing hopper, a through feeding port is provided at the top of the feeding cylinder, the processing hopper is located outside the feeding cylinder and corresponds to the feeding port, and a telescopic tube is connected to the bottom of the processing hopper.

[0017] A conveying pipe is installed on the outside of the fixed cylinder, and the end of the telescopic pipe away from the processing bucket is connected to the conveying pipe. A conveying auger is rotatably installed inside the conveying pipe.

[0018] Preferably, the storage component also includes a packaging component, which includes a rotating ring that is rotatably disposed on the outside of the fixed cylinder. The rotating ring has multiple placement slots equidistantly provided on it. The conveying pipe extends above the placement slots and has a discharge port at one end located above the placement slots. The fixed cylinder is also equipped with a cover plate, which has a through slot corresponding to the discharge port.

[0019] Preferably, one of the mounting slots is provided through the entire space.

[0020] Preferably, two grinding rollers are symmetrically installed inside the processing hopper, and the two grinding rollers rotate in opposite directions.

[0021] Preferably, the material feeding auger is installed inside the inner cylinder via a push spring.

[0022] On the other hand, a method for detecting heavy metals in agricultural soil is described below: S1. Material Retrieval and Soil Crushing: Drive the material auger to rotate, push the spring to help the inner cylinder to descend, fix the outer cylinder, and the saw teeth of the inner and outer cylinders cut hard soil. The material auger cuts the soil and sends it to the inner cylinder. S2. Controlled-depth sampling: Adjust the material feeding auger to deliver soil and perform sampling at a fixed depth; S3. Sample collection: Use the collection component to crush the residual soil clumps with the soil grinding roller; divide the delivered soil into multiple portions for easy subsequent testing.

[0023] In summary, this application includes at least one of the following beneficial technical effects: I. This invention adjusts the height of the arc plate by driving the screw, which can precisely control the descent depth of the material-collecting auger. It can collect soil at a specific depth as needed, and also collect the same amount of samples from different depths. It supports the subsequent mixing of soil from multiple depths to obtain an average of the test samples that reflect the heavy metal content of the entire land area. It takes into account both vertical distribution analysis and overall content assessment, resulting in more comprehensive test data.

[0024] Second, this invention sets the inner cylinder to rotate with the material-collecting auger and the outer cylinder to be fixed by the limiting column. The serrated protrusions at the bottom of both cylinders generate shearing force, which can break hard soil blocks in the sampling path, prevent soil blocks from blocking vertical sample cavities, and ensure the continuity of the sample in the vertical direction. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0028] Figure 3 This is a partial structural schematic diagram of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the storage component of the present invention.

[0030] Figure 5 This is the present invention. Figure 4 A schematic diagram of the structure at point A in the middle.

[0031] Figure 6 This is a schematic diagram of the rotating ring structure of the present invention.

[0032] Figure 7 This is a schematic diagram of the structure for controlling the rotation of the rotating ring according to the present invention.

[0033] Figure 8 This is the present invention. Figure 7 A schematic diagram of the structure at point B.

[0034] In the diagram, 1. Fixed cylinder; 2. Feeding cylinder; 20. Inner cylinder; 21. Outer cylinder; 3. Feeding assembly; 30. Feeding auger; 50. Mounting ring; 51. Limiting post; 52. Positioning plate; 60. Drive screw; 61. Arc plate; 62. Mating block; 4. Storage assembly; 40. Processing hopper; 41. Telescopic pipe; 42. Conveying pipe; 43. Conveying auger; 7. Sub-assembly component; 70. Rotary ring; 71. Placement slot; 72. Cover plate; 73. Through slot; 74. Drive gear; 75. Drive gear ring; 8. Grinding roller; 9. Push spring. Detailed Implementation

[0035] The following combination Figures 1-8 The embodiments of the present invention will be described in detail below.

[0036] This application discloses an agricultural soil heavy metal detection device and method. The invention is mainly used in the process of heavy metal detection in soil. In terms of technical effect, it can avoid the problem that the sampling tube cannot be completely filled due to the obstruction of soil clods when it is inserted, resulting in uneven sampling. Furthermore, the invention can also solve the problem that samples from a single depth may miss pollution information of deeper soil layers, leading to misjudgment of the overall pollution level.

[0037] Example 1: Reference Figure 1 and Figure 2As shown, an agricultural soil heavy metal detection device is used. When detecting heavy metals in agricultural soil, soil samples are typically taken vertically, processed, and then analyzed using specialized equipment. The device includes a fixed cylinder 1, inside which a sampling cylinder 2 is slidably installed along its height. The sampling cylinder 2 is inserted into the soil sample to be tested for sampling. Inside the fixed cylinder 1 is a sampling component 3 for assisting the sampling cylinder 2 in entering the soil and sampling. This sampling component can vertically insert into the soil for sampling at different depths, facilitating observation of the vertical distribution of heavy metals during testing. It also allows for the collection of the same amount of soil from different depths and the mixing of soil samples from different depths to achieve sample averaging and to observe the heavy metal content across the entire land area.

[0038] The fixed cylinder 1 is also equipped with a storage component 4 for soil sampling in conjunction with the sampling cylinder 2. After the soil sample is taken by the sampling component 3, the soil sample is placed and stored one by one by the storage component 4, providing an orderly sample basis for subsequent testing.

[0039] The sampling assembly 3 includes a sampling auger 30 rotatably disposed inside the sampling cylinder 2. The sampling auger 30 extends to the outside of the sampling cylinder 2. When sampling, the sampling cylinder 2 is aligned with the part to be sampled, and a fixing pin is provided at the bottom of the fixing cylinder 1. The fixing pin is inserted into the soil to fix the fixing cylinder 1. At the same time, the end of the sampling auger 30 located outside the sampling cylinder 2 is inserted into the soil. Then, the sampling auger 30 is driven to rotate by a motor. As the sampling auger 30 rotates, it can gradually enter the soil and insert the sampling cylinder 2 into the soil. The rotation of the sampling auger 30 will cut the soil and transport the soil back into the sampling cylinder 2, thus completing the sampling work.

[0040] Reference Figure 2 The diagram shows a structural schematic for crushing soil clods. Specifically, the material handling cylinder 2 includes an inner cylinder 20 and an outer cylinder 21, with serrated protrusions evenly spaced at the bottom of both the inner cylinder 20 and the outer cylinder 21.

[0041] An installation ring 50 is fitted on the top of the inner cylinder 20, and a receiving groove is provided on the inner wall of the outer cylinder 21. The installation ring 50 is rotatably set in the receiving groove.

[0042] The auger 30 is fixedly connected to the inner cylinder 20. When the auger 30 rotates, it can rotate the inner cylinder 20 while the outer cylinder 21 remains stationary. The auger 30 and the inner cylinder 20 will rotate synchronously, and the mounting ring 50 will rotate in the receiving groove. At this time, the inner cylinder 20 and the outer cylinder 21 can form relative motion. During the descent, when encountering some relatively hard soil clods, the inner cylinder 20 and the outer cylinder 21 can form shear to break the soil clods. This prevents the soil clods from being blocked during the descent, which would prevent the auger 2 from being unable to completely wrap the soil clods, causing some soil clods to be squeezed and shifted, forming voids, resulting in uneven vertical distribution of the sampled soil, invalidation of sample representativeness, and inability to reflect the true vertical characteristics of the soil.

[0043] Reference Figure 2 and Figure 3 The diagram shows the structure for fixing the outer cylinder 21. Specifically, limiting posts 51 are symmetrically installed inside the fixing cylinder 1, and positioning plates 52 fitted onto the positioning posts are symmetrically arranged on the outer cylinder 21. The outer cylinder 21, via the limiting posts 51, will not rotate during its descent following the inner cylinder 20, thus generating shear force with the inner cylinder 20 to break up the soil clods it encounters during descent. Soil exhibits distinct vertical stratification; if the sampling cylinder 2 descends due to uneven resistance, soil from different layers may become entangled, disrupting the integrity of the vertical stratification. Active crushing allows the sampling cylinder 2 to cut vertically along a preset path, ensuring that each soil layer is uniformly crushed before entering the sampling cylinder 2, preventing soil layer misalignment and mixing, and ensuring that the sample accurately reflects the soil properties at different depths.

[0044] Reference Figure 2 and Figure 3 The diagram shows the structure for adjusting the descent depth of the material handling auger 30. Specifically, a drive screw 60 is symmetrically installed inside the fixed cylinder 1, and an arc-shaped plate 61 is slidably installed on the outside of the outer cylinder 21. The two ends of the arc-shaped plate 61 are threadedly connected to the drive screw 60. A mating block 62 is symmetrically arranged on the top of the outer cylinder 21, and the mating block 62 moves in contact with the arc-shaped plate 61.

[0045] The height of the arc-shaped plate 61 within the fixed barrel is controlled by the drive screw 60, and the outer cylinder 21 descends. Simultaneously, the mating block 62 on the outer end descends. When the mating block 62 contacts the arc-shaped plate 61, the outer cylinder 21 cannot continue to descend due to the limiting effect of the arc-shaped plate 61. At this point, the continuous rotation of the material-collecting auger 30 will stop collecting material, and the soil already inside the inner cylinder 20 will be gradually transported upwards. Therefore, by controlling the height of the arc-shaped plate 61 to regulate the material-collecting depth, it is ensured that only samples of the target soil layer are collected, truly reflecting the in-situ state of that soil layer, providing a reliable basis for heavy metal detection in agricultural soils.

[0046] Furthermore, a thick rubber pad (not shown in the figure) is laid on the top of the arc plate 61 to prevent the contact between the arc plate 61 and the mating block 62 from being a rigid collision, which may cause the outer cylinder 21 to vibrate instantaneously, affecting the stability of the material taking auger 30 and ensuring a smooth sampling process.

[0047] Reference Figure 4 , Figure 6 and Figure 7 The diagram shows a structural schematic of the soil sample being packaged. Specifically, the receiving component 4 includes a processing hopper 40, whose core function is to transport the soil from the sampling cylinder 2 to the outside of the equipment and to separate it into bottles for storage, thus preventing sample mixing or contamination. The top of the sampling cylinder 2 has a through-feed port, and the processing hopper 40 is located on the outside of the sampling cylinder 2 and corresponds to the feeding port. The bottom of the processing hopper 40 is connected to a telescopic tube 41.

[0048] The telescopic pipe 41 can adapt to the lifting and lowering of the processing bucket 40 with the material receiving cylinder 2, ensuring that the telescopic pipe 41 can guarantee the soil conveying effect when the material receiving cylinder 2 is inserted into the soil at different depths.

[0049] A conveying pipe 42 is installed on the outside of the fixed cylinder 1. The end of the telescopic pipe 41 away from the processing hopper 40 is connected to the conveying pipe 42. A conveying auger 43 is rotatably installed inside the conveying pipe 42. Soil is conveyed upward by the auger 30. The continuous conveying of the auger 30 will send the soil out of the feeding port and then into the processing hopper 40. After entering the processing hopper 40, it will fall into the external conveying pipe 42 through the telescopic pipe 41. The soil sample is then conveyed upward by the conveying auger 43. In this way, the soil inside the fixed cylinder 1 is conveyed to the outside for subsequent sample sorting and collection.

[0050] Reference Figure 4 , Figure 6 and Figure 7 The diagram shows a schematic of the sample bottle placement structure. Specifically, the storage component 4 also includes a dispensing component 7, which includes a rotating ring 70 rotatably mounted on the outside of the fixed cylinder 1. Multiple placement slots 71 are equidistantly arranged on the rotating ring 70. A conveying pipe 42 extends above the placement slots 71, and an outlet is located at one end above the placement slots 71. A cover plate 72 is also installed on the fixed cylinder 1, and a through-slot 73 corresponding to the outlet is provided on the cover plate 72. The soil in the conveying pipe 42 is gradually conveyed upwards by the conveying auger 43 and falls through the outlet. The soil falling from the outlet enters the placement slot 71 through the through-slot 73 on the cover plate 72. Sample bottles for soil preservation are placed in the placement slots 71. The soil falls into the sample bottles through the through-slot 73. By controlling the rotation of the rotating ring 70, different samples are placed in different sample bottles. To prevent sample vials from being damaged due to collisions between the equipment and the placement slot 71, and to fix the position of the sample vials to prevent them from shifting when the rotating ring 70 rotates.

[0051] Reference Figure 6 , Figure 7 and Figure 8 The diagram shows a schematic of the structure for adjusting the position of the sample bottle; specifically, one of the placement slots 71 is installed through the sample bottle. If a large amount of soil sample is being transported, the rotating ring 70 is controlled to rotate so that the through placement slot 71 corresponds to the discharge port, and excess soil will fall through the through placement slot 71.

[0052] A drive gear ring 75 is provided at the bottom of the rotating ring 70. A motor is provided on the fixed cylinder 1 through a support plate. A drive gear 74 that meshes with the drive gear ring 75 is installed at the output end of the motor. The rotation of the drive gear 74 is controlled by the motor, thereby controlling the rotation of the rotating ring 70.

[0053] Reference Figure 4 and Figure 5 The diagram shows a structural schematic for crushing the sampled soil clods. Specifically, two grinding rollers 8 are symmetrically installed inside the processing hopper 40, rotating in opposite directions. The output shafts of the two grinding rollers are connected via gear transmission. If the soil entering the processing hopper 40 contains solidified soil clods that have not been crushed by the sampling cylinder 2, the relatively rotating grinding rollers 8 will perform secondary crushing on the soil clods, refining the soil particles. This prevents residual hard soil clods in the sample from affecting subsequent testing, causing uneven sampling, insufficient reagent reaction, and other problems, thus ensuring the accuracy of the test results.

[0054] Reference Figure 2 The diagram shows the structure of the auger 30. Specifically, the auger 30 is installed inside the inner cylinder 20 via a push spring 9. The auger 30, via the push spring 9, maintains a downward force during its descent. Combined with the cutting effect of the auger 30 on the soil, this ensures that the auger 30 can move the inner cylinder 20 downwards within the soil. This ensures that the auger 30 can stably guide the inner cylinder 20 downwards within the soil. The elasticity of the push spring 9 ensures that the inner cylinder 20 overcomes soil resistance during its descent, preventing sampling interruptions due to soil compaction.

[0055] During work: The first step is to insert the fixing pin at the bottom of the fixing cylinder 1 into the soil to position the equipment, prevent it from shifting, and ensure the sampling depth and verticality.

[0056] The second step involves starting the motor to drive the material-collecting auger 30 to rotate, with the push spring 9 assisting it to lower the inner cylinder 20. The outer cylinder 21 remains fixed due to the limiting post 51. The serrated protrusions at the bottom of the inner cylinder 20 and the outer cylinder 21 shear the hard soil. The material-collecting auger 30 cuts the soil and transports it in the opposite direction to the material-collecting cylinder 2.

[0057] The third step involves adjusting the drive screw 60 to change the height of the arc plate 61. After the outer cylinder 21 and the mating block 62 touch the arc plate 61, the descent stops, and the material auger 30 only feeds soil upwards to achieve sampling at a specific depth.

[0058] In the fourth step, the soil enters the processing hopper 40 through the feeding port of the feeding cylinder 2, where the internal reverse grinding roller 8 breaks up the residual soil clods.

[0059] Fifth step: The crushed soil enters the conveying pipe 42 through the telescopic pipe 41, and is then sent to the discharge port by the conveying auger 43.

[0060] The sixth step involves the motor driving the rotating ring 70 to rotate, aligning the sample bottle with the discharge port to collect soil; multiple samples are placed in the placement slot 71 via the rotating ring 70, and excess soil is discharged through the placement slot 71.

[0061] Step 7: Remove the seal mark from the sample vial and prepare it for testing.

[0062] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An agricultural soil heavy metal detection device, comprising a fixed cylinder (1), characterized in that: A material-taking cylinder (2) is slidably disposed inside the fixed cylinder (1) along its height direction, and a material-taking cylinder (2) is disposed inside the fixed cylinder (1) to cooperate with the material-taking cylinder (2): (3) Material extraction components that enter the soil and extract soil. (4) A soil sample storage component. The material handling assembly (3) includes a material handling auger (30) rotatably disposed inside the material handling cylinder (2) and the material handling auger (30) extends to the outside of the material handling cylinder (2); The material receiving cylinder (2) includes an inner cylinder (20) and an outer cylinder (21). The bottom of both the inner cylinder (20) and the outer cylinder (21) are provided with serrated protrusions at equal intervals.

2. The agricultural soil heavy metal detection device according to claim 1, characterized in that: An installation ring (50) is fitted on the top of the inner cylinder (20), and a receiving groove is provided on the inner wall of the outer cylinder (21). The installation ring (50) is rotatably set in the receiving groove.

3. The agricultural soil heavy metal detection device according to claim 1, characterized in that: The fixed cylinder (1) is symmetrically equipped with limit posts (51), and the outer cylinder (21) is symmetrically equipped with positioning plates (52) sleeved on the positioning posts.

4. The agricultural soil heavy metal detection device according to claim 1, characterized in that: Inside the fixed cylinder (1), a drive screw (60) is symmetrically installed. An arc plate (61) is slidably installed on the outside of the outer cylinder (21). The two ends of the arc plate (61) are threadedly connected to the drive screw (60). A mating block (62) is symmetrically arranged on the top of the outer cylinder. The mating block (62) and the arc plate (61) move against each other.

5. The agricultural soil heavy metal detection device according to claim 1, characterized in that: The storage component (4) includes a processing bucket (40), a through feeding port is provided at the top of the feeding cylinder (2), the processing bucket (40) is located on the outside of the feeding cylinder (2) and corresponds to the feeding port, and a telescopic tube (41) is connected to the bottom of the processing bucket (40). The fixed cylinder (1) is equipped with a conveying pipe (42) on the outside. The end of the telescopic pipe (41) away from the processing bucket (40) is connected to the conveying pipe (42). The conveying pipe (42) is equipped with a conveying auger (43) that rotates inside.

6. The heavy metal detection device for agricultural soil according to claim 5, characterized in that: The storage component (4) also includes a sub-assembly component (7), which includes a rotating ring (70). The rotating ring (70) is rotatably disposed on the outside of the fixed cylinder (1). Multiple placement slots (71) are equidistantly provided on the rotating ring (70). The conveying pipe (42) extends above the placement slots (71) and has a discharge port at one end above the placement slots (71). A cover plate (72) is also installed on the fixed cylinder (1). A through slot (73) corresponding to the discharge port is provided on the cover plate (72).

7. The heavy metal detection device for agricultural soil according to claim 6, characterized in that: One of the mounting slots (71) is through-mounted.

8. The agricultural soil heavy metal detection device according to claim 1, characterized in that: Two grinding rollers (8) are symmetrically installed inside the processing bucket (40), and the two grinding rollers (8) rotate in opposite directions.

9. The agricultural soil heavy metal detection device according to claim 1, characterized in that: The material feeding auger (30) is installed inside the inner cylinder (20) via a push spring (9).

10. A method for detecting heavy metals in agricultural soil, further comprising the agricultural soil heavy metal detection device as described in any one of claims 1-9, characterized in that: The detection method is as follows: S1. Material Retrieval and Soil Crushing: Drive the material auger (30) to rotate, push spring (9) to help the inner cylinder (20) to descend, outer cylinder (21) to be fixed, inner and outer cylinders (21) saw teeth to cut hard soil, material auger (30) cuts soil and sends it to the inner cylinder (20). S2. Controlled depth sampling: Adjust the material feeding auger (30) to deliver soil and sample at a fixed depth; S3. Sample collection: Use the storage component (4) to crush the residual soil clumps with the soil grinding roller (8); divide the delivered soil into multiple portions for easy subsequent testing.

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