A sampling device for pesticide residue detection and a sampling method thereof

Abstract

This invention relates to the field of sampling technology and discloses a sampling device and method for pesticide residue detection. The sampling device for pesticide residue detection includes a frame, a moisture sampling box, a dry mud sampling box, and a driver. The frame is divided into a loading chamber and a discharge chamber by a partition. The moisture sampling box is placed below the loading chamber, and the dry mud sampling box is placed below the discharge chamber. A conveying pipe is installed in the loading chamber, and an auger is installed inside the conveying pipe. A drainage hole is opened at the bottom of the conveying pipe. A discharge port communicating with the conveying pipe is opened in the middle of the partition, and a circular ring is rotatably installed inside the discharge port. A mud-blocking circular plate and a loading disc are arranged in the discharge chamber and connected to the driver. This invention sets a rotating V-shaped crusher and an air-blowing disturbance component at the discharge port. Through the coordinated action of radial cutting, airflow dispersion, and opening and closing angle adjustment, the problem of dry mud compaction and blockage is solved, while achieving mud-water separation sampling, eliminating the interference of moisture on pesticide residue detection, and improving detection accuracy.

Description

Technical Field

[0001] This invention relates to the field of sampling technology, and in particular to a sampling device and sampling method for pesticide residue detection. Background Technology

[0002] In field trials, pesticide spraying is a crucial measure for controlling pests and diseases and increasing crop yields. To ensure that pesticide use complies with relevant regulations, it is necessary to sample and test the farmland soil. However, traditional sampling methods typically involve directly extracting cement-containing soil using sampling tubes. The resulting samples are mud-water mixtures with high moisture content, affecting the accuracy of the tests. Specifically, pesticides can be classified according to their properties into hydrophilic pesticides (such as some herbicides and insecticides) and hydrophobic pesticides (such as pyrethroids and organochlorines). The former are easily soluble in water and mainly exist in the aqueous phase, while the latter are easily adsorbed onto soil organic matter. For soil or clay particles, conventional testing requires extraction with organic solvents. However, in a mud-water mixture, the water dilutes the organic solvent, reducing extraction efficiency. Furthermore, the salts and soluble organic matter in the water may interfere with the extraction process, preventing the target pesticide from being fully transferred to the extract. This results in lower or more volatile test values, making it difficult to accurately reflect the true pesticide residue data in the soil. It has been found that a screw press dewatering machine can separate the mud-water mixture, allowing for separate sampling of soil and water, thereby effectively eliminating the adverse effects of water on subsequent pesticide residue testing.

[0003] A search revealed Chinese patent CN107935353A, a screw press type mud dewatering machine, comprising a frame and screw press type mud dewatering devices. The frame includes a base plate and baffles hinged to the base plate on both sides. Multiple screw press type mud dewatering devices are arranged side by side on the base plate. Each screw press type mud dewatering device includes a rotating shaft driven by a motor and mounted along the base plate, and a screw press mechanism that rotates with the rotating shaft. A feed inlet is located above the downstream end of the screw press mechanism, and a filtrate outlet is located below it. A screw press mechanism is fixedly installed below the filtrate outlets of the multiple screw press type mud dewatering devices. The system includes interconnected and inclined filtrate tanks. An upstream end of the screw press mechanism has a sludge discharge chamber connected to the screw press mechanism, with sludge discharge ports. Belt conveyors are installed below the multiple sludge discharge ports. The above scheme primarily uses a conveying auger to transport the mud along a conveying pipe towards the sludge discharge ports. The mud is gradually compressed by the auger, and the water in the mud is discharged from the drain hole at the bottom of the conveying pipe. The dried mud is discharged from the sludge discharge ports under the action of the auger, thus achieving mud-water separation and sampling. However, existing screw press dewatering machines still have shortcomings when performing mud-water separation and sampling on soil:

[0004] Currently, screw press dewatering machines typically have baffles at the discharge port to guide the dewatered mud to fall in a predetermined direction, enabling sampling of the dried mud. However, during the dewatering process, when the mud is conveyed by an auger in the conveying pipe, the mud near the discharge port is relatively dry after dewatering, making it prone to clogging. In addition, the baffles themselves exert a certain amount of pressure on the discharged mud, and the continuous forward movement of the mud at the rear end during screw conveying exerts a continuous axial thrust on the mud at the front end. Under this cumulative effect, the mud between the discharge port and the baffles is gradually compacted, especially in the central area where the force is concentrated, resulting in more significant compaction and exacerbating the clogging problem in the discharge port area.

[0005] To address the aforementioned issues, this application proposes a sampling device and sampling method for pesticide residue detection. Summary of the Invention

[0006] This invention proposes a sampling device and method for pesticide residue detection, which solves the problem in related technologies where the dried mud after dewatering is easily blocked at the discharge port when the screw press dewatering machine is used for mud-water separation sampling. In particular, the mud baffle plate puts pressure on the mud, and the axial thrust generated by the screw conveyor accumulates, causing the mud between the discharge port and the mud baffle plate to gradually compact, resulting in concentrated force in the central area and aggravated blockage.

[0007] The present invention provides a sampling device for pesticide residue detection, comprising a frame, a moisture sampling box, a dry mud sampling box, and a driver.

[0008] The frame is divided into a loading chamber and a discharge chamber by a partition. The moisture sampling box is placed below the loading chamber and the dry mud sampling box is placed below the discharge chamber. A conveying pipe is installed in the loading chamber, and an auger is installed in the conveying pipe. A drainage hole is opened at the bottom of the conveying pipe. A discharge round opening connected to the conveying pipe is opened in the middle of the partition, and a ring is rotatably installed in the discharge round opening.

[0009] The mudguard circular plate and the loading disc are arranged in the discharge chamber and connected to the driver. Driven by the driver, they move closer to or away from the discharge opening. A disc is rotatably installed in the middle of the mudguard circular plate. Multiple circumferentially arranged V-shaped parts are installed between the disc and the ring. A driving component that drives the disc to rotate is installed on the loading disc.

[0010] The loading disk is equipped with an air-blowing disturbance component that is fixed through the disk and located between multiple V-shaped components. The pointed ends of the V-shaped components are arranged facing the air-blowing disturbance component. When the drive component drives the disk to rotate, it drives the V-shaped components, the ring and the air-blowing disturbance component to rotate synchronously.

[0011] As a further optimization of the present invention, the V-shaped component includes two dispersing rods, the two dispersing rods are hinged at adjacent ends to form a V-shaped structure, the two dispersing rods are respectively hinged at opposite ends to a disk and a ring, and an included angle is formed between the two dispersing rods;

[0012] When the driver drives the mudguard disc to move closer to the ring, the angle between the two dispersion rods gradually decreases, and the tip of its V-shaped structure gradually moves closer to the air-blowing disturbance component. When the driver drives the mudguard disc to move away from the ring, the angle between the two dispersion rods gradually increases, and the tip of its V-shaped structure gradually moves away from the air-blowing disturbance component.

[0013] As a further optimization of the present invention, multiple piercing cones are fixed on both sides of the dispersing rod at intervals.

[0014] As a further optimization of the present invention, the air blowing disturbance component includes a rotary joint and an air vent. The rotary joint is installed on the side of the loading plate. The rotary joint is connected to the rotating air outlet end of the rotary joint and the air vent is fixedly passed through the disc and located between multiple V-shaped parts. An air outlet is opened on the outer periphery of the air vent. The air inlet end of the rotary joint is connected to an air guide hose, and the air guide hose is used to connect to the air supply equipment.

[0015] As a further optimization of the present invention, a plurality of spaced-apart agitator cones are installed on the vent pipe.

[0016] As a further optimization of the present invention, the driving component includes a drive motor, a driving gear and a driven gear. One end of the disc extends between the mudguard disc and the loading disc. The driven gear is fixedly mounted on one end of the disc. The drive motor is installed on the loading disc. The output end of the drive motor is connected to the driving gear that meshes with the driven gear.

[0017] As a further optimization of the present invention, the driver includes an electric guide rail, which is installed on the top of the loading cavity and arranged towards the partition. The driving end of the electric guide rail is connected to a bracket, and the mudguard and the loading disc are both fixed to the bottom of the bracket.

[0018] As a further optimization of the present invention, an arc-shaped tube is installed on the side of the mudguard circular plate near the circular ring. Multiple air blowing holes are opened on the inner side of the arc-shaped tube at intervals. An air supply hose is connected to the outer periphery of the arc-shaped tube, and the air supply hose is used to connect to an air pump. Multiple circumferentially arranged cleaning rods are installed on the disc, and the cleaning rods are in contact with the side of the mudguard circular plate near the circular ring.

[0019] As a further optimization of the present invention, a feed hopper connected to a conveying pipe is installed on the frame, and the diameter of the conveying pipe gradually decreases from the feed hopper end to the annular end.

[0020] A sampling method for pesticide residue detection, employing the aforementioned pesticide residue detection sampling device, includes the following steps:

[0021] Step 1: Cement-containing soil enters the conveying pipe through the feed hopper and is conveyed to the discharge port through the auger. During the conveying process, the auger squeezes the water in the mud and the water is discharged from the drain hole at the bottom of the conveying pipe into the moisture sampling box. The dehydrated mud is discharged from the discharge port into the dry mud sampling box.

[0022] Step 2: The driving component drives the disc to rotate synchronously with the V-shaped component, the ring and the air blowing agitator to break up the discharged mud.

[0023] Step 3: The driver drives the mudguard plate to move the disc back and forth towards or away from the ring. When it moves closer, the included angle of the V-shaped part gradually decreases, and its tip gradually moves closer to the air blowing disturbance part. When it moves away, the included angle of the V-shaped part gradually increases, and its tip gradually moves away from the air blowing disturbance part.

[0024] The above-described technical solution of the present invention has the following beneficial technical effects:

[0025] 1. Cement-containing soil enters the conveying pipe through the feed hopper and is transported to the discharge port via an auger. During the conveying process, the auger squeezes out the water in the soil, which is discharged from the drain hole at the bottom of the conveying pipe into the water sampling box. The dehydrated soil is discharged from the annular part of the discharge port into the dry soil sampling box, thus achieving soil-water separation sampling. This effectively eliminates the interference of water on subsequent pesticide residue detection. For hydrophilic pesticides, the separated aqueous phase can be independently tested for its dissolved pesticide content. For hydrophobic pesticides, the dehydrated dry soil phase avoids the dilution effect of water on organic solvents and the interference of salt and soluble organic matter in the water on the extraction process, improving detection accuracy and thus more accurately reflecting the true state of pesticide residues in the soil. This ensures the accuracy of pesticide use compliance assessment in farmland. During the process, the drive unit drives the disc to rotate, which in turn drives multiple circumferentially arranged V-shaped parts between the disc and the ring to rotate synchronously. Since the tips of the V-shaped parts face the center area of ​​the discharged mud, they are equivalent to multiple rotating blades, continuously cutting and breaking the compacted mud cake radially, destroying its continuous block structure, preventing the formation of large blockages, and avoiding excessive compaction in the center area. In addition, the rotating V-shaped parts drive the crushed mud particles to spread to the surrounding area, reducing the residence time of the mud between the discharge port and the mud-blocking plate, forming a continuous and uniform discharge state. This solves the problem of easy compaction and blockage of dry mud at the discharge port of traditional screw press dewatering machines. At the same time, it realizes the mud-water separation sampling required for pesticide residue detection, avoids water dilution of organic solvents for detection, and interference with the extraction process, thereby improving the accuracy of soil pesticide residue detection.

[0026] 2. The present invention provides a piercing cone on the V-shaped part. When the V-shaped part rotates, the piercing cone on it can pierce the blocky mud material, which further enhances the crushing ability of the compacted mud material, improves the crushing effect of the V-shaped part on the mud material, makes the mud material easier to disperse into fine particles, reduces the risk of blockage, and improves the adaptability of the device to high viscosity and easy compaction mud material.

[0027] 3. In order to directly break the blocky structure of the mud from the middle, the present invention fixes an air-blowing disturbance component between multiple V-shaped components in the middle of the mud-blocking circular plate. When the drive component drives the disc to rotate, it can not only drive the V-shaped components to rotate, but also drive the air-blowing disturbance component to rotate synchronously. The air-blowing disturbance component can blow high-pressure gas outward from the middle of the mud, which plays the role of airflow cutting and dispersing the blocky mud. When the air-blowing disturbance component rotates, it can also pierce and disturb the blocky mud in the middle through the stirring cone on it. Combined with the cutting of the airflow, it realizes the direct destruction of the blocky structure of the mud from the middle, further improving the anti-clogging effect in the central area of ​​the mud.

[0028] 4. When the mud is discharged, the compaction is relatively severe. The driver can drive the mud-blocking disc to move back and forth towards the ring. During this process, the driver does not drive the disc to rotate. When the disc approaches the ring, the included angle on the V-shaped part decreases, and its tip inserts into the central area of ​​the mud. When the disc moves away from the ring, the included angle on the V-shaped part increases, and its tip moves away from the central area of ​​the mud. This achieves the application of a diffusion force from the center outward to the mud. By changing the opening and closing angle of the V-shaped part, the active penetration and expansion action of the centrally compacted mud is achieved, solving the problem of compaction and blockage in the central area. After the problem is solved, the distance between the disc and the ring can be adjusted by the driver as needed to control the depth of the V-shaped part's insertion into the central area of ​​the discharged mud. This provides the best initial conditions for subsequent rotary crushing action and enhances the adaptability and treatment effect of the device to blockage problems under different mud types and different dewatering degrees. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a sampling device for pesticide residue detection proposed in this invention;

[0030] Figure 2 This is a front view of a sampling device for pesticide residue detection proposed in this invention;

[0031] Figure 3 This is a schematic diagram of the cooperation structure between the partition and the conveying pipe in this invention;

[0032] Figure 4 This is a schematic diagram of the internal structure of the delivery pipe in this invention;

[0033] Figure 5This is a schematic diagram of the mating structure of the partition, ring, mudguard plate, loading disc and V-shaped component in this invention;

[0034] Figure 6 This is a schematic diagram of the cooperative structure of the ring, mudguard plate, loading disc, disk, V-shaped component and driver in this invention;

[0035] Figure 7 This is a schematic diagram of the cooperation structure between the driving component and the air-blowing disturbance component in this invention;

[0036] Figure 8 This is a schematic diagram of the mating structure between the disk and the driven gear in this invention;

[0037] Figure 9 This is a schematic diagram of the V-shaped component in this invention;

[0038] Figure 10 This is a schematic diagram of the arc-shaped tube in this invention;

[0039] Figure 11 This is a schematic diagram of the air-blowing disturbance component in this invention.

[0040] Reference numerals: 1. Frame; 101. Partition plate; 102. Conveying pipe; 103. Screwdriver; 104. Ring; 105. Feed hopper; 106. Moisture sampling box; 107. Dry mud sampling box; 2. Mud-blocking circular plate; 21. Disc; 211. Cleaning rod; 22. Arc-shaped pipe; 221. Air blowing hole; 222. Air supply hose; 3. Loading tray; 4. Driver; 41. Electric guide rail; 42. Support; 5. V-shaped component; 51. Dispersing rod; 52. Piercing cone; 6. Driving component; 61. Drive motor; 62. Driving gear; 63. Driven gear; 7. Air blowing disturbance component; 71. Rotary joint; 711. Air guide hose; 72. Vent pipe; 721. Air outlet; 73. Agitating cone. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0042] like Figure 1-11 As shown, the present invention proposes a sampling device for pesticide residue detection, which includes a frame 1, a moisture sampling box 106, a dry mud sampling box 107 and a driver 4;

[0043] The frame 1 is divided into a loading chamber and a discharge chamber by a partition 101. A moisture sampling box 106 is placed below the loading chamber, and a dry mud sampling box 107 is placed below the discharge chamber. A conveying pipe 102 is installed in the loading chamber, and an auger 103 is installed inside the conveying pipe 102. A drainage hole is opened at the bottom of the conveying pipe 102. A discharge round opening communicating with the conveying pipe 102 is opened in the middle of the partition 101, and a ring 104 is rotatably installed inside the discharge round opening.

[0044] The mudguard circular plate 2 and the loading disc 3 are set in the discharge chamber and connected to the driver 4. Driven by the driver 4, they move closer to or away from the discharge circular opening. A disc 21 is rotatably installed in the middle of the mudguard circular plate 2. Multiple circumferentially arranged V-shaped parts 5 are installed between the disc 21 and the ring 104. A driving part 6 that drives the disc 21 to rotate is installed on the loading disc 3.

[0045] An air-blowing disturbance 7 is fixedly installed on the loading plate 3, passing through the disc 21 and located between multiple V-shaped parts 5. The tip of the V-shaped part 5 is arranged facing the air-blowing disturbance 7. When the driving member 6 drives the disc 21 to rotate, it drives the V-shaped part 5, the ring 104 and the air-blowing disturbance 7 to rotate synchronously.

[0046] The mud enters the conveying pipe 102 from the feed hopper 105. The screw conveyor 103 rotates to convey the mud in a spiral manner, while squeezing out the water in the mud. Wastewater is discharged from the drain hole at the bottom of the conveying pipe 102 into the water sampling box 106. The dehydrated mud is conveyed to the discharge port and discharged from the ring 104 into the dry mud sampling box 107, realizing the separation and sampling of mud and water. This can effectively eliminate the interference of water on subsequent pesticide residue detection. For hydrophilic pesticides, the dissolved pesticide content can be detected independently in the separated aqueous phase. For hydrophobic pesticides, the dehydrated dry mud phase avoids the dilution effect of water on organic solvents and the interference of salt and soluble organic matter in water on the extraction process, improving the detection accuracy and thus more accurately reflecting the true situation of pesticide residues in the soil, ensuring the accuracy of the compliance assessment of pesticide use in farmland.

[0047] During the discharge process, the drive unit 6 drives the disc 21 to rotate, and the disc 21 drives multiple circumferentially arranged V-shaped parts 5 between it and the ring 104 to rotate synchronously. Since the tips of the V-shaped parts 5 face the center area of ​​the discharged mud, they are equivalent to multiple rotating blades when rotating, continuously cutting and crushing the compacted mud cake radially, destroying its continuous block structure, preventing the formation of large blockages, and avoiding excessive compaction in the center area. In addition, the rotating V-shaped parts 5 drive the crushed mud particles to spread to the surrounding area, reducing the residence time of the mud between the discharge port and the mud-blocking plate 2, forming a continuous and uniform discharge state, reducing the clogging frequency in the discharge port area, solving the problem of easy compaction and clogging of dry mud at the discharge port of traditional screw press dewatering machines, and realizing the mud-water separation sampling required for pesticide residue detection, avoiding water dilution of organic solvents and interference with the extraction process, and improving the accuracy of soil pesticide residue detection.

[0048] It should be noted that in order to directly break the blocky structure of the mud from the middle, the present invention fixes the air-blowing disturbance component 7 between multiple V-shaped components 5 in the middle of the mud-blocking circular plate 2. When the driving component 6 drives the disc 21 to rotate, it can not only drive the V-shaped components 5 to rotate, but also drive the air-blowing disturbance component 7 to rotate synchronously. The air-blowing disturbance component 7 can blow high-pressure gas outward from the middle of the mud, which plays the role of airflow cutting and dispersing the blocky mud. Moreover, when the air-blowing disturbance component 7 rotates, it can also disturb the blocky mud in the middle. With the cutting of the airflow, it can directly break the blocky structure of the mud from the middle, and further improve the anti-clogging effect in the central area of ​​the mud.

[0049] It should be noted that when the mud is discharged, the compaction is relatively severe. The driver 4 can drive the mud-blocking disc 2 to move the disc 21 towards or away from the ring 104. During this process, the driver 6 does not drive the disc 21 to rotate. When the disc 21 approaches the ring 104, the included angle on the V-shaped part 5 decreases, and its tip inserts into the central area of ​​the mud. When the disc 21 moves away from the ring 104, the included angle on the V-shaped part 5 increases, and its tip moves away from the central area of ​​the mud. This achieves the application of a diffusion force from the center outward to the mud. By changing the opening and closing angle of the V-shaped part 5, the active insertion and expansion action of the centrally compacted mud is achieved, solving the problem of compaction and blockage in the central area. After the problem is solved, the distance between the disc 21 and the ring 104 can be adjusted as needed by the driver 4 to control the depth of the V-shaped part 5 inserted into the central area of ​​the discharged mud. This provides the best initial conditions for the subsequent rotary crushing action, enhancing the adaptability and treatment effect of the device to mud blockage under different working conditions.

[0050] It should be noted that the above structure does not simply add a stirring structure to the outside of the discharge port. Instead, it integrates the axial conveying of the mud, the rotation of the ring 104, the central cutting-in of the V-shaped component 5, and the central airflow of the air-blowing agitator 7 into the same mud cake compaction area. Because the tip of the V-shaped component 5 faces the central area, it can form a cutting-in path from the center outward when rotating, thus dividing the continuous block structure of the mud cake. This changes the concentration state of the central area, making it easier for the divided mud blocks to be carried away from the discharge port circumferentially and radially. The air-blowing agitator 7 is located between multiple V-shaped components 5. It can output airflow from the center of the mud cake. After the gas enters the cracks of the mud cake, it can reduce the degree of adhesion between the mud blocks and make the mud blocks that have been cut by the V-shaped part 5 easier to disperse. The ring 104 rotates with the V-shaped part 5, so that the boundary of the mud cake near the inner wall of the discharge port is in a dynamic contact state, reducing the obstruction of the boundary mud accumulation on the subsequent discharge of mud cake. As a result, after the mud is pushed by the screw conveyor 103 at the end of dewatering, it is not directly stopped by the mud-blocking circular plate 2, but undergoes a process of cutting, disturbing, dispersing and falling outside the discharge port, making the mud discharge continuity of the discharge port more suitable for processing the sticky mud cake after the moisture content is reduced.

[0051] It should be further noted that the frame 1 is equipped with a servo motor that drives the auger 103 to rotate. This is existing technology and will not be elaborated on further.

[0052] In this embodiment, the V-shaped component 5 includes two dispersing rods 51. The two dispersing rods 51 are hinged at their adjacent ends to form a V-shaped structure. The ends of the two dispersing rods 51 that are far apart are respectively hinged to the disk 21 and the ring 104. An included angle is formed between the two dispersing rods 51.

[0053] When the driver 4 drives the mudguard disc 2 to move the disc 21 closer to the ring 104, the included angle between the two dispersing rods 51 gradually decreases, and the tip of its V-shaped structure gradually moves closer to the air-blowing disturbance component 7. When the driver 4 drives the mudguard disc 2 to move the disc 21 away from the ring 104, the included angle between the two dispersing rods 51 gradually increases, and the tip of its V-shaped structure gradually moves away from the air-blowing disturbance component 7.

[0054] When the mud is compressed in front of the discharge port, the blockage is not evenly distributed. The mud cake near the edge of the ring 104 is more affected by the wall shear, while the central area mainly bears the axial thrust and the reverse pressure of the mud-blocking plate 2. The central area is more likely to form a dense mud core. In this embodiment, each V-shaped part 5 is formed by two dispersing rods 51 hinged together. When the driver 4 pushes the mud-blocking plate 2, the disc 21 and the loading disc 3 closer to the ring 104, the distance between the disc 21 and the ring 104 decreases, and the far ends of the two dispersing rods 51 are forced to move closer to each other. The included angle between the dispersing rods 51 becomes smaller, and the tip of the V-shaped part 5 moves towards the central area where the air-blowing disturbance part 7 is located. At this time, the V-shaped part 5 can extend into the center of the mud cake in a pointed manner, cutting into the originally continuous mud core. As the drive 4 moves the mud-blocking disc 2 away from the ring 104, the distance between the disc 21 and the ring 104 increases, the angle between the two dispersing rods 51 increases, and the tip of the V-shaped part 5 moves away from the air-blowing disturbance part 7. The mud core that has been cut in is dispersed outward by the outward movement of the dispersing rods 51. By changing the opening and closing angle of the V-shaped part 5, the active insertion and opening action of the compacted mud in the center is realized, solving the problem of compaction and blockage in the central area. After the problem is solved, the distance between the disc 21 and the ring 104 can be adjusted by the drive 4 as needed to control the depth of the tip of the V-shaped part 5 inserted into the central area of ​​the discharged mud, providing the best initial conditions for the subsequent rotary crushing action, and enhancing the adaptability and treatment effect of the device to different farmland mud blockages.

[0055] It should be noted that when the drive unit 6 drives the disc 21 to rotate, it can drive the V-shaped structure formed by the two dispersing rods 51 to rotate, which is used to continuously cut and crush the mud.

[0056] In this embodiment, multiple piercing cones 52 arranged at intervals are fixed on both sides of the dispersing rod 51.

[0057] After dehydration, the mud often presents as a lump with a relatively dry outer layer and a small amount of moisture still trapped inside. After being squeezed, the outer layer of the mud lump will form a relatively dense adhesive surface. When the dispersing rod 51 passes over the surface of the mud lump alone, it may push the mud lump as a whole to move without breaking the surface layer in time. Therefore, in this embodiment, multiple piercing cones 52 are arranged at intervals on both sides of the dispersing rod 51. When the dispersing rod 51 rotates or opens and closes, the piercing cones 52 first contact the outer layer of the mud lump and form a local piercing point. Then, the dispersing rod 51 continues to advance to complete the cutting and diffusion. This arrangement on both sides allows the mud cake to be pierced in both the rotational cutting and opening and closing actions, avoiding the piercing structure being effective only in one direction.

[0058] In this embodiment, the air blowing disturbance component 7 includes a rotary joint 71 and an air pipe 72. The rotary joint 71 is installed on the side of the loading plate 3. The rotary joint 71 is connected to the rotating air outlet end of the rotary joint 71. The air pipe 72 is fixedly passed through the disc 21 and located between multiple V-shaped components 5. An air outlet 721 is opened on the outer periphery of the air pipe 72. The air inlet end of the rotary joint 71 is connected to an air guide hose 711. The air guide hose 711 is used to connect to the air supply equipment.

[0059] When the drive unit 6 drives the disc 21 to rotate, it drives the vent pipe 72 connected to the rotary joint 71 to rotate synchronously. High-pressure gas enters the rotary joint 71 through the air guide hose 711, and then is ejected outward from the air outlet 721 through the vent pipe 72. Since the vent pipe 72 is located between multiple V-shaped parts 5 and in the central area of ​​the mud discharge, the ejected high-pressure gas can be directly ejected from the middle of the mud to the outside, which plays the role of airflow cutting the blocky mud and blowing it to the surroundings. Combined with the crushing of the V-shaped parts 5, the airflow and the V-shaped parts 5 are synergistically crushed, which further improves the anti-clogging ability of the central area of ​​the mud, promotes the uniform distribution of mud to the dry mud sampling box 107, and strengthens the anti-clogging effect of the central area.

[0060] In this embodiment, a plurality of spaced-apart agitator cones 73 are installed on the vent pipe 72.

[0061] When the drive unit 6 drives the disc 21 to rotate the vent pipe 72, the agitator cone 73 rotates together with the vent pipe 72. During the rotation, the cone-shaped tip of the agitator cone 73 continuously penetrates and agitates the central area of ​​the discharged mud, breaking up the compacted blocky mud in the center. At the same time, the air outlet 721 on the outer periphery of the vent pipe 72 continuously sprays high-pressure gas. The airflow blows the mud particles broken up by the agitator cone 73 to the surrounding area. The agitation of the agitator cone 73 and the blowing effect of the high-pressure airflow work together to achieve the effect of directly destroying the blocky structure of the mud from the center, preventing the mud in the central area from forming large blockages and further improving the anti-clogging effect.

[0062] In this embodiment, the driving component 6 includes a driving motor 61, a driving gear 62 and a driven gear 63. One end of the disc 21 extends between the mudguard disc 2 and the loading disc 3. The driven gear 63 is fixedly mounted on one end of the disc 21. The driving motor 61 is installed on the loading disc 3. The output end of the driving motor 61 is connected to the driving gear 62 that meshes with the driven gear 63.

[0063] When the drive motor 61 starts, the drive gear 62 rotates and drives the driven gear 63 to rotate, thereby driving the disc 21 to rotate. The disc 21 drives the multiple V-shaped parts 5 installed on it to rotate synchronously. During the rotation, the V-shaped parts 5 radially cut and disperse the discharged mud, and at the same time drive the vent pipe 72 to rotate synchronously, so that it sprays high-pressure airflow from the middle of the mud, realizing the coordinated work of cutting and airflow disturbance, ensuring that the mud is continuously and evenly discharged, and avoiding blockage in the central area.

[0064] In this embodiment, the driver 4 includes an electric guide rail 41, which is installed on the top of the loading cavity and arranged towards the partition 101. The driving end of the electric guide rail 41 is connected to a bracket 42, and the mudguard circular plate 2 and the loading plate 3 are both fixed to the bottom of the bracket 42.

[0065] The electric guide rail 41 can drive the bracket 42 to move along the guide rail direction, thereby driving the mud-blocking circular plate 2 and the loading disc 3 to move closer or further away from the discharge circular opening. When the mud-blocking circular plate 2 moves closer to the ring 104, it drives the V-shaped part 5 on the disc 21 to reduce the included angle and insert the tip into the center area of ​​the mud. When it moves away, the included angle of the V-shaped part 5 increases and the tip spreads the mud.

[0066] The distance between the disc 21 and the ring 104 can be adjusted by the electric guide rail 41, which controls the depth of the V-shaped part 5 inserted into the mud, providing the best initial conditions for the subsequent rotary crushing action and enhancing the adaptability of the device to different working conditions. The above-mentioned automated spacing adjustment and reciprocating movement can adaptively adjust the working state according to the dryness and wetness of the mud and the size of the lumps, improving the adaptability of the device to different farmland soil mud.

[0067] In this embodiment, an arc-shaped tube 22 is installed on the side of the mudguard circular plate 2 near the ring 104. Multiple air holes 221 are arranged at intervals on the inner side of the arc-shaped tube 22. An air supply hose 222 is connected to the outer periphery of the arc-shaped tube 22, and the air supply hose 222 is used to connect to an air pump. Multiple circumferentially arranged cleaning rods 211 are installed on the disc 21, and the cleaning rods 211 are in contact with the side of the mudguard circular plate 2 near the ring 104.

[0068] In the actual mud discharge process, the mud cake will not only be compacted in the central area of ​​the discharge port, but may also form an adhesive layer on the side of the mud baffle plate 2 near the ring 104. If the adhesive layer continues to thicken, it will change the effective distance between the mud baffle plate 2 and the discharge port. Therefore, an air blowing structure is set on the mud baffle plate 2. After the air supply hose 222 is connected to the air pump, the gas enters the arc-shaped pipe 22 and is blown out from the air blowing hole 221 toward the front side of the mud baffle plate 2 or the mud cake falling area. The arc-shaped pipe 22 can be arranged along part of the circumference of the mud baffle plate 2 so that the airflow covers the area where the mud cake is easy to stick. The mud block is disturbed by the airflow before and after contacting the mud baffle plate 2, making it easier to detach from the surface of the mud baffle plate 2.

[0069] Furthermore, as the disc 21 rotates, the cleaning rod 211 sweeps across the surface of the mud-blocking disc 2 along with the disc 21, scraping off the mud layer adhering to the mud-blocking disc 2. Since the cleaning rod 211 rotates together with the disc 21, its cleaning action occurs synchronously with the action of the V-shaped part 5 cutting apart the mud cake. After the mud cake is broken apart by the V-shaped part 5, some mud may be thrown onto the surface of the mud-blocking disc 2, and the cleaning rod 211 will then carry away this part of the mud.

[0070] In this embodiment, a feed hopper 105 connected to the conveying pipe 102 is installed on the frame 1, and the diameter of the conveying pipe 102 gradually decreases from the feed hopper 105 end to the annular ring 104 end.

[0071] After the mud enters the conveying pipe 102 through the feed hopper 105, as the diameter of the conveying pipe 102 gradually decreases, the mud is subjected to increasing pressure under the spiral propulsion of the auger 103. The water is gradually squeezed out and discharged from the drainage hole at the bottom of the conveying pipe 102. The moisture content of the mud gradually decreases along the conveying direction, forming a gradual dehydration effect from wet to dry.

[0072] It should be noted that during use, a mud pump is used to select several areas in the experimental farmland. The mud pump extracts cement-containing soil from the farmland and then transports it through pipelines to the feed hopper 105. The device is used to separate the mud and water. Multi-point sampling followed by unified mud-water separation and testing can accurately reflect the overall distribution of pesticide residues in the soil of the entire experimental farmland, avoiding the random errors of single-point sampling. Furthermore, after mud-water separation, pesticide residues in the aqueous phase and mud phase are tested separately, further ensuring the representativeness and accuracy of the pesticide residue test results.

[0073] A sampling method for pesticide residue detection, employing the aforementioned pesticide residue detection sampling device, includes the following steps:

[0074] Step 1: Cement-containing soil enters the conveying pipe 102 through the feed hopper 105 and is conveyed to the discharge port through the auger 103. During the conveying process, the auger 103 squeezes the water in the mud and the water is discharged from the drainage hole at the bottom of the conveying pipe 102 into the water sampling box 106. The dehydrated mud is discharged from the discharge port into the dry mud sampling box 107.

[0075] Step 2: The driving component 6 drives the disc 21 to drive the V-shaped component 5, the ring 104 and the air blowing disturbance component 7 to rotate synchronously, thereby breaking up the discharged mud.

[0076] Step 3: The driver 4 drives the mudguard plate 2 to move the disc 21 toward or away from the ring 104. When it moves closer, the included angle of the V-shaped part 5 gradually decreases and its tip gradually moves closer to the blowing disturbance part 7. When it moves away, the included angle of the V-shaped part 5 gradually increases and its tip gradually moves away from the blowing disturbance part 7.

[0077] It should be noted that the above-mentioned collaborative work, from the gradual dehydration of mud conveying and independent sampling of mud-water separation to the cutting of discharge port, airflow disturbance, and adaptive opening and closing dredging, solves the problem of dry mud compaction and blockage at the discharge port of traditional equipment. At the same time, it realizes the separation and sampling of mud and water samples, eliminates the interference of moisture, salt and soluble organic matter on pesticide residue detection, and improves the accuracy of pesticide residue detection in farmland soil.

[0078] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. A sampling device for pesticide residue detection, characterized in that, Includes a frame (1), a moisture sampling box (106), a dry mud sampling box (107), and a drive (4); The frame (1) is divided into a loading chamber and a discharge chamber by a partition (101). A moisture sampling box (106) is placed below the loading chamber, and a dry mud sampling box (107) is placed below the discharge chamber. A conveying pipe (102) is installed in the loading chamber. An auger (103) is installed in the conveying pipe (102). A drainage hole is opened at the bottom of the conveying pipe (102). A discharge round opening communicating with the conveying pipe (102) is opened in the middle of the partition (101). A ring (104) is rotatably installed in the discharge round opening. The mudguard circular plate (2) and the loading disc (3) are located in the discharge chamber and connected to the driver (4). Driven by the driver, they move closer to or away from the discharge opening. A disc (21) is rotatably mounted in the middle of the mudguard circular plate (2). Multiple circumferentially arranged V-shaped parts (5) are installed between the disc (21) and the ring (104). A driving part (6) that drives the disc (21) to rotate is installed on the loading disc (3). The loading disk (3) is equipped with a blower (7) that passes through the disk (21) and is located between multiple V-shaped parts (5). The tip of the V-shaped part (5) is arranged facing the blower (7). When the drive (6) drives the disk (21) to rotate, it drives the V-shaped part (5), the ring (104) and the blower (7) to rotate synchronously.

2. The sampling device for pesticide residue detection according to claim 1, characterized in that, The V-shaped component (5) includes two dispersing rods (51), the two dispersing rods (51) are hinged at one end to form a V-shaped structure, the two dispersing rods (51) are hinged at the opposite ends to a disc (21) and a ring (104) respectively, and an included angle is formed between the two dispersing rods (51). When the driver (4) drives the mudguard (2) to move the disc (21) closer to the ring (104), the included angle between the two dispersing rods (51) gradually decreases, and the tip of its V-shaped structure gradually moves closer to the blowing disturbance (7). When the driver (4) drives the mudguard (2) to move the disc (21) away from the ring (104), the included angle between the two dispersing rods (51) gradually increases, and the tip of its V-shaped structure gradually moves away from the blowing disturbance (7).

3. The sampling device for pesticide residue detection according to claim 2, characterized in that, Multiple piercing cones (52) are fixed on both sides of the dispersing rod (51) at intervals.

4. The sampling device for pesticide residue detection according to claim 1, characterized in that, The air blowing disturbance component (7) includes a rotary joint (71) and an air pipe (72). The rotary joint (71) is installed on the side of the loading plate (3). The rotary joint (71) is connected to the air pipe (72) at the rotating air outlet end. The air pipe (72) is fixedly passed through the disc (21) and located between multiple V-shaped parts (5). The air pipe (72) has an air outlet hole (721) on its outer periphery. The rotary joint (71) is connected to an air guide hose (711) at the air inlet end. The air guide hose (711) is used to connect to the air supply equipment.

5. A sampling device for pesticide residue detection according to claim 4, characterized in that, Multiple agitator cones (73) are installed on the vent pipe (72) at intervals.

6. The sampling device for pesticide residue detection according to claim 1, characterized in that, The drive unit (6) includes a drive motor (61), a drive gear (62) and a driven gear (63). One end of the disc (21) extends between the mudguard disc (2) and the loading disc (3). The driven gear (63) is fixedly mounted on one end of the disc (21). The drive motor (61) is mounted on the loading disc (3). The output end of the drive motor (61) is connected to the drive gear (62) that meshes with the driven gear (63).

7. The sampling device for pesticide residue detection according to claim 1, characterized in that, The driver (4) includes an electric guide rail (41) which is mounted on the top of the loading cavity and arranged toward the partition (101). The drive end of the electric guide rail (41) is connected to a bracket (42). The mudguard (2) and the loading disc (3) are both fixed to the bottom of the bracket (42).

8. The sampling device for pesticide residue detection according to claim 1, characterized in that, An arc-shaped tube (22) is installed on the side of the mudguard (2) near the ring (104). Multiple air holes (221) are arranged at intervals on the inner side of the arc-shaped tube (22). An air supply hose (222) is connected to the outer periphery of the arc-shaped tube (22), and the air supply hose (222) is used to connect to an air pump. Multiple circumferentially arranged cleaning rods (211) are installed on the disc (21), and the cleaning rods (211) are in contact with the side of the mudguard (2) near the ring (104).

9. A sampling device for pesticide residue detection according to claim 1, characterized in that, The frame (1) is equipped with a feed hopper (105) that communicates with the conveying pipe (102), and the diameter of the conveying pipe (102) gradually decreases from the feed hopper (105) end to the ring (104) end.

10. A sampling method for pesticide residue detection, employing a pesticide residue detection sampling device as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Cement-containing soil enters the conveying pipe (102) through the feed hopper (105) and is conveyed to the discharge port through the auger (103). During the conveying process, the auger (103) squeezes the water in the mud and the water is discharged from the drainage hole at the bottom of the conveying pipe (102) into the water sampling box (106). The dehydrated mud is discharged from the discharge port into the dry mud sampling box (107). Step 2: The driving component (6) drives the disc (21) to drive the V-shaped component (5), the ring (104) and the air blowing disturbance component (7) to rotate synchronously and break up the discharged mud. Step 3: The driver (4) drives the mudguard (2) to move the disc (21) closer to or further away from the ring (104). When it moves closer, the included angle of the V-shaped part (5) gradually decreases and its tip gradually moves closer to the blowing disturbance part (7). When it moves away, the included angle of the V-shaped part (5) gradually increases and its tip gradually moves away from the blowing disturbance part (7).

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