A processing device for detecting pesticide residues in purple yam

Abstract

This utility model discloses a processing device for detecting pesticide residues in purple yam, belonging to the field of agricultural product testing equipment. The device includes a frame and, from top to bottom, a sample pretreatment chamber, a purification chamber, and a collection chamber. The pretreatment chamber features low-temperature pulverization and solvent atomization premixing functions. The purification chamber has a double-layer cylindrical structure; its inner cylinder has a spiral guide core and a composite adsorption packing layer specifically for adsorbing pigments and mucilage from purple yam. The bottom of the outer cylinder has a diversion structure that connects to the collection chamber and a circulation loop leading to the top of the inner cylinder. The collection chamber integrates concentration and collection modules. This utility model achieves integrated and specialized pretreatment for pesticide residue detection in purple yam. Through low-temperature anti-gelatinization, directional adsorption purification, and a recyclable purification design, it significantly improves processing efficiency, purification effect, and detection accuracy, solving the technical problem of difficult pretreatment of the special matrix of purple yam.

Description

Technical Field

[0001] This utility model relates to the technical field of agricultural product quality and safety testing equipment, specifically to a pretreatment device for detecting pesticide residues in purple yam. Background Technology

[0002] Purple yam, an important crop used both as food and medicine, is experiencing increasing market value and consumer demand due to its rich content of anthocyanins, saponins, and other functional components. However, its food safety, particularly pesticide residues, has become a core concern restricting the standardization of the industry and the expansion into high-end markets. Pesticide residue detection is a crucial step in ensuring its safety, but the sample processing before detection, including extraction, purification, and concentration, is complex, time-consuming, and prone to introducing errors.

[0003] Currently, the pretreatment of purple yam for pesticide residue detection faces the following unique challenges: First, purple yam is rich in starch and mucilage, which easily gelatinizes and clumps during crushing and extraction, resulting in low extraction efficiency. Second, the natural anthocyanin pigments it contains severely interfere with chromatographic detection, and general-purpose purification columns are difficult to remove them specifically, causing significant interference with the detection signal and poor accuracy. Third, existing processing equipment is mostly single-function or simply integrated general-purpose equipment, requiring manual sample transfer between different devices, which is inefficient, has poor reproducibility, and cannot meet the specific and efficient processing requirements of the special matrix of purple yam.

[0004] Therefore, there is an urgent need for a dedicated device that can integrate and efficiently complete the pretreatment of purple yam samples. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an integrated processing device specifically for detecting pesticide residues in purple yam. The technical solution adopted by this invention is as follows: A processing device for detecting pesticide residues in purple yam includes a frame, a sample pretreatment chamber, a low-temperature pulverizing chamber and a premixing chamber located below the low-temperature pulverizing chamber, a cooling plate embedded in the cavity wall of the low-temperature pulverizing chamber, a feeding port at the top of the low-temperature pulverizing chamber, and a bottom connection between the low-temperature pulverizing chamber and the premixing chamber, the premixing chamber having a stirring paddle inside and a solvent premixing spray head on its side wall, a purification chamber located directly below the premixing chamber, the purification chamber having a double-layer cylindrical structure including an inner cylinder and an outer cylinder arranged coaxially, the top of the inner cylinder being connected to the liquid outlet of the premixing chamber via a connecting pipe, a spiral guide core on the central axis inside the inner cylinder, the outer edge of the spiral blades of the spiral guide core forming a narrow fluid channel with the inner wall of the inner cylinder, the cylinder wall of the inner cylinder including a porous sieve plate layer, a composite adsorption packing layer and a heating jacket, a diversion structure at the bottom of the outer cylinder, and a collection chamber, the top of the collection chamber being connected to the diversion structure at the bottom of the outer cylinder via a pipeline.

[0006] The composite adsorption packing layer is composed of two layers of packing units with different functions tightly packed in the radial direction. The inner layer is a polyamide fiber modified with polyvinylpyrrolidone for the anthocyanin pigments of Dioscorea opposita, and the outer layer is a silica microsphere coated with quaternized chitosan for polysaccharides and mucilage.

[0007] It also includes an integrated control system, which is fixed to the side panel of the frame and electrically connected to the purification chamber and the collection chamber.

[0008] The integrated control system is preset with a fully automatic continuous mode and a segmented manual mode.

[0009] The solvent premixing spray head is equipped with an atomizing plate and is connected to an external solvent storage tank through a pipeline.

[0010] The collection chamber integrates a thin-film evaporator, a condenser, and a quantitative collection bottle for receiving the final concentrate. The thin-film evaporator, the condenser, and the quantitative collection bottle are connected by pipes.

[0011] The quantitative collection bottle is placed on a high-precision weighing sensor.

[0012] The connecting pipe is a corrugated pipe structure, and its two ends are connected to the liquid outlet of the premixing chamber and the top of the inner cylinder respectively by quick-connect clamps.

[0013] The spiral guide core has a hollow structure and a backwashing pipe extending to the bottom of the inner cylinder is installed inside. The outlet of the backwashing pipe is located at the end of the spiral guide core.

[0014] The outer cylinder has a three-way flow divider structure. One channel of the flow divider structure is connected to the top of the inner cylinder through a pipeline to form a circulation loop. The circulation loop is driven by a micro circulation pump.

[0015] Compared with the prior art, the present invention has the following significant advantages: Highly efficient and targeted: The integrated pretreatment system enables closed-loop continuous operation. Its unique low-temperature pulverization and spiral flow purification structure is specifically designed for the complex matrix, easy gelatinization, and high content of interfering colored substances in purple yam, significantly improving processing efficiency and purification effect.

[0016] Excellent purification effect: The double-layer cylindrical purification chamber, combined with a special composite adsorption packing, can efficiently and selectively adsorb and remove the main interfering substances such as pigments and mucus in purple yam, greatly reducing the matrix effect and laying a good foundation for subsequent high-precision detection.

[0017] Easy to operate and highly reliable: The modular compartment design facilitates maintenance. The diversion structure and circulation loop allow for flexible control of the purification level, ensuring stable quality of the purified solution. The overall simple structure reduces operational complexity and improves the reproducibility of treatment results. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the processing device of this utility model; Figure 2 This is a schematic internal cross-sectional view of the processing device of this utility model; Figure 3 This is a schematic diagram of the internal structure of the premixing chamber in the sample pretreatment chamber; Figure 4 This is a schematic diagram of the inner cylinder wall structure of the cleanroom; Figure 5 for Figure 2 A magnified view of part M in the image.

[0019] The components include: 1. Frame; 2. Sample pretreatment chamber; 21. Low-temperature pulverizing chamber; 211. Cooling element; 212. Feeding port; 22. Premixing chamber; 221. Stirring paddle; 23. Solvent premixing nozzle; 231. Atomizing element; 232. Solvent storage tank; 3. Purification chamber; 31. Inner cylinder; 311. Porous sieve plate layer; 312. Composite adsorption packing layer; 313. Heating jacket; 32. Outer cylinder; 33. Connecting pipe; 34. Spiral guide core; 341. Backwashing pipeline; 35. Diverter structure; 36. Micro circulation pump; 4. Collection chamber; 41. Thin film evaporator; 42. Condenser recovery unit; 43. Quantitative collection bottle; 431. High-precision weighing sensor; 5. Integrated control system. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0021] See Figures 1 to 5 According to this utility model, a processing device for detecting pesticide residues in purple yam includes a frame 1, a sample pretreatment chamber 2, the sample pretreatment chamber 2 including a low-temperature pulverizing chamber 21 and a premixing chamber 22 disposed below the low-temperature pulverizing chamber 21, a cooling chip 211 embedded in the cavity wall of the low-temperature pulverizing chamber 21, a feeding port 212 provided at the top of the low-temperature pulverizing chamber 21, and the bottom of the low-temperature pulverizing chamber 21 communicating with the premixing chamber 22, a stirring paddle 221 provided inside the premixing chamber 22, a solvent premixing spray head 23 provided on the side wall of the premixing chamber 22, and a purification chamber 3 located directly below the premixing chamber 22. The chamber 3 has a double-layer cylindrical structure, including an inner cylinder 31 and an outer cylinder 32 arranged coaxially. The top of the inner cylinder 31 is connected to the liquid outlet of the premixing chamber 22 through a connecting pipe 33. An adjustable-speed rotating spiral guide core 34 is provided on the central axis inside the inner cylinder 31. The outer edge of the spiral blade of the spiral guide core 34 forms a narrow fluid channel with the inner wall of the inner cylinder 31. The cylinder wall of the inner cylinder 31 includes a porous sieve plate layer 311, a composite adsorption packing layer 312, and a heating jacket 313. The bottom of the outer cylinder 32 is provided with a diversion structure 35 and a collection chamber 4. The top of the collection chamber 4 is connected to the diversion structure 35 at the bottom of the outer cylinder 32 through a pipeline.

[0022] effect: The frame 1 constitutes the physical load-bearing body and structural skeleton of the entire device, providing a stable and reliable installation benchmark and spatial positioning for all functional chambers and components, ensuring that the sample pretreatment chamber 2, the purification chamber 3 and the collection chamber 4 can be precisely fixed in the preset vertical process flow sequence, realizing the integration and modular integration of the device, and ensuring the overall rigidity and stable operation of the equipment.

[0023] The sample pretreatment chamber 2 is a key functional module that transforms the purple yam sample from a solid state into a liquid homogenate suitable for purification. It integrates multiple dispersion steps such as crushing, mixing, and initial extraction into a single continuous chamber, creating the necessary preconditions for subsequent deep purification.

[0024] The cryogenic pulverizing chamber 21 is equipped with a universal rotary pulverizer, a sealed chamber specifically designed for receiving and physically breaking down raw purple yam samples. This rapidly breaks down blocky or flaky purple yam into fine particles, significantly increasing its surface area and laying the physical foundation for subsequent efficient solvent extraction of pesticide residues.

[0025] The cooling chip 211 is embedded in the cavity wall of the low-temperature grinding chamber 21, which can actively and precisely control the chamber temperature during the grinding process. Targeting the starch-rich characteristics of purple yam, it can effectively remove the frictional heat generated by high-speed mechanical grinding, prevent the sample temperature from rising and causing starch gelatinization and degradation of some thermally unstable pesticide residues, thereby ensuring the representativeness of the sample while improving the extraction and recovery rate of the target analyte.

[0026] The feed port 212 is located on the top of the cryogenic pulverizing chamber 21 and is an openable and closable channel. It provides operators with a convenient and controllable sample input interface and can maintain the airtightness of the cryogenic pulverizing chamber 21 during pulverization and subsequent processing to prevent sample loss, solvent evaporation or external contamination.

[0027] The premixing chamber 22 is located directly below the low-temperature pulverizing chamber 21. It is used to receive the crushed sample particles and provide a container for liquid-solid mixing. The sample particles and the extraction solvent are fully contacted and mixed here to form a uniform sample homogenate, thus completing the initial transfer of pesticide residues from the solid matrix to the liquid solvent.

[0028] The stirring paddle 221 is disposed inside the premixing chamber 22 and is driven by a drive motor to rotate at high speed. By generating strong eddies and shear forces, the pulverized purple yam particles are forcibly mixed with the added extraction solvent thoroughly and quickly, preventing particle agglomeration or sedimentation, ensuring the formation of a homogenized slurry in a short time, and improving the efficiency and consistency of the initial extraction.

[0029] The solvent premixing nozzle 23 is installed on the side wall of the premixing chamber 22, and introduces the extraction solvent from the external solvent supply system into the stirred sample particles in an optimized manner, such as atomization or spraying. Compared with direct pouring, this design allows the solvent to more evenly and quickly coat and wet each sample particle, greatly improving solvent utilization and initial extraction rate.

[0030] The purification chamber 3 can perform deep, targeted and efficient purification of the crude extract from the premixing chamber 22, which contains a large amount of interfering substances such as pigments and mucopolysaccharides from the purple yam matrix. It specifically adsorbs and removes these interfering substances, thereby obtaining a pure solution containing pesticide residues, providing a qualified sample for final instrument testing.

[0031] The inner cylinder 31 houses the packing material and the spiral guide core 34, while the outer cylinder 32 wraps around the inner cylinder 31. The annular space between the two forms an effective filtration structure, realizing the "dynamic circulation purification" function.

[0032] The connecting pipe 33 connects the liquid outlet of the premixing chamber 22 to the top inlet of the inner cylinder 31, achieving sealed fluid transfer between the two independent chambers. A flexible connection is generally used; its flexibility compensates for minor alignment deviations that may occur during equipment assembly or module disassembly, and allows for a certain degree of vibration isolation, enhancing the reliability of the connection and the maintainability of the equipment.

[0033] The outer edge of the spiral blades of the spiral guide core 34 forms a narrow flow channel with the cylinder wall, which effectively increases the flow path length and greatly improves the filtration efficiency.

[0034] The porous sieve plate layer 311 is the innermost structure that constitutes the inner wall of the inner cylinder 31. As a support layer and barrier, its porous nature ensures that liquid can pass through freely.

[0035] The composite adsorption packing layer 312 is the core functional material of the purification chamber 3, enabling selective purification. Utilizing specific chemical functional groups or physical structures on the surface of the packing particles, it specifically and with high capacity captures matrix interferences such as pigments, mucilage, and sugars in the purple yam homogenate through mechanisms such as adsorption, distribution, and ion exchange, while allowing target pesticide molecules to pass through as much as possible, thereby "purifying" the pesticide residues to be tested in a complex sample background.

[0036] The heating jacket 313 is disposed on the upper side of the inner cylinder 31 to heat the sample solution flowing through the inner cylinder 31. Appropriate heating can reduce the viscosity of the sample solution and accelerate the molecular diffusion rate, thereby optimizing the adsorption kinetics of the composite adsorption packing layer 312, improving the purification efficiency, and making the purification conditions more stable and controllable.

[0037] The diversion structure 35 is located at the bottom of the outer cylinder 32, serving as a control hub for the flow direction of the purified liquid. It distributes the liquid flowing from the inner cylinder 31 into the outer cylinder 32, and determines whether to directly guide it to the collection chamber 4 to complete a single purification based on a preset program or mode, or to guide part or all of it back to the top of the inner cylinder 31 for cyclic purification. It is a key mechanical control node for realizing different purification modes.

[0038] The collection chamber 4 is connected to the diversion structure 35 via a pipeline. It can be used to receive and temporarily store the purified liquid output from the purification chamber 3. This provides an integrated processing platform for subsequent final sample preparation steps such as concentration and volume adjustment, extending the function of the device from "purification" to "obtaining the final sample before detection", further improving the continuity of the process.

[0039] See Figures 1 to 5 According to this utility model, a processing device for detecting pesticide residues in purple yam is provided. The composite adsorption packing layer 312 is composed of two layers of packing units with different functions, tightly packed radially. The inner layer is polyamide fiber targeting anthocyanin pigments in purple yam, and the outer layer is silica microspheres targeting polysaccharides and mucilage. This structure is an innovative design for the special matrix of purple yam, which is rich in anthocyanin pigments and polysaccharide mucilage. The inner packing utilizes the composite modified structure of polyvinylpyrrolidone and polyamide fiber to efficiently capture anthocyanin pigments in purple yam through hydrogen bonding and specific adsorption, solving the core problem of pigment interference in detection signals. The outer packing utilizes the cationic properties of quaternized chitosan and the large specific surface area of ​​silica gel to strongly adsorb negatively charged polysaccharides, mucilage, and other polar impurities. The two packing layers are tightly packed radially, forming a gradient, functional purification barrier, achieving directional, efficient, and deep removal of interfering substances in the purple yam matrix, an effect that ordinary general-purpose purification packing cannot achieve.

[0040] See Figures 1 to 5 The present invention provides a processing device for detecting pesticide residues in purple yam, which further includes an integrated control system 5 electrically connected to the purification chamber 3 and the collection chamber 4. The integrated control system 5 has preset fully automatic continuous mode and segmented manual mode. As the "brain" of the device, the integrated control system 5 coordinates the control of related actuators, including the purification chamber 3 and the collection chamber 4, such as motors, heaters, and pumps, to achieve automated or semi-automated operation of the entire pretreatment process. The fully automatic continuous mode is suitable for batch processing of standard samples; after one-button start, the device can automatically complete all steps sequentially, greatly improving efficiency and reducing human error. The segmented manual mode provides users with flexible operation space during method development, troubleshooting, or maintenance, enhancing the practicality and convenience of the device.

[0041] See Figures 1 to 5 According to the present invention, a processing device for detecting pesticide residues in purple yam is provided, wherein the solvent premixing spray head 23 is equipped with an atomizing plate 231, which is connected to an external solvent storage tank 232 via a pipeline. The atomizing plate 231 can break the extraction solvent from the solvent storage tank 232 into micron-sized droplets through high-frequency oscillation, and spray them into the premixing chamber 22 through the solvent premixing spray head 23. This atomization injection method allows the solvent to instantly and uniformly coat and wet the purple yam sample fragments, which significantly improves the contact efficiency and extraction consistency in the initial stage of extraction compared to direct pouring, while also helping to reduce the amount of solvent used.

[0042] See Figures 1 to 5According to the present invention, a processing device for detecting pesticide residues in purple yam is provided. The collection chamber 4 integrates a thin-film evaporator 41, a condenser 42, and a quantitative collection bottle 43. The thin-film evaporator 41, the condenser 42, and the quantitative collection bottle 43 are connected by pipes. The quantitative collection bottle 43 is placed on a high-precision weighing sensor 431. The thin-film evaporator 41 is used to rapidly and gently concentrate the purified liquid, reducing a large volume of extract to a small volume to meet instrument detection requirements. The threaded double-necked bottle facilitates disassembly and cleaning. The condenser 42 is used to condense and recover the evaporated solvent. The quantitative collection bottle 43 is used to receive the final concentrated liquid. The high-precision weighing sensor 431 at the bottom can monitor the weight of the concentrated liquid in real time. When the weight reaches a preset value, the concentration process can be automatically stopped by the control system, achieving accurate and automatic determination of the concentration endpoint and ensuring the accuracy of the sample concentration.

[0043] See Figures 1 to 5 According to the present invention, a processing device for detecting pesticide residues in purple yam is provided, wherein the connecting pipe 33 is a corrugated pipe structure, and both ends are connected by quick-connect clamps. The flexibility of the corrugated pipe structure allows for a certain displacement compensation capability during installation and maintenance, facilitating the pulling and positioning of the sample pretreatment chamber 2. The quick-connect clamps enable rapid sealing connection and disassembly of the pipeline, greatly enhancing the practicality and maintenance convenience of the modular design of the device.

[0044] See Figures 1 to 5 According to the present invention, a processing device for detecting pesticide residues in purple yam is provided. The spiral guide core 34 has a hollow structure with a backwash pipe 341 running through it, and its outlet is located at the end of the spiral guide core 34. This enables online in-situ cleaning of the purification chamber 3. After purification is completed, the cleaning solvent can be pumped in from the end of the spiral guide core 34 through the backwash pipe 341 to backwash the composite adsorption packing layer 312, carrying away the adsorbed impurities and restoring the purification capacity of the packing. This structure integrates the cleaning function into the core moving parts, eliminating the need to disassemble the complex purification chamber 3 and solving the problem of difficult maintenance of dedicated integrated devices.

[0045] See Figures 1 to 5According to the present invention, a processing device for detecting pesticide residues in purple yam is provided. The diversion structure 35 of the outer cylinder 32 is a three-way valve, with one channel connected to the top of the inner cylinder 31 via a pipeline, forming a circulation loop driven by a micro-circulation pump 36. This structure constitutes the dynamic circulation purification mechanism of the device. Through the three-way valve of the diversion structure 35 and the micro-circulation pump 36, some or all of the liquid flowing to the outer cylinder 32 can be pumped back to the top of the inner cylinder 31, allowing it to flow through the composite adsorption packing layer 312 multiple times. This circulation processing mode significantly extends the purification time, and is particularly suitable for processing complex samples with high levels of interfering substances, such as purple yam, ensuring the thoroughness and reliability of the purification effect.

[0046] The implementation process of this utility model device is briefly described as follows: Pretreatment: The purple yam sample is added to the low-temperature pulverizing chamber 21 through the feeding port 212. After being pulverized at low temperature by the cooling plate 211, it falls into the premixing chamber 22. The solvent premixing spray head 23 atomizes and sprays the solvent from the solvent storage tank 232, and the stirring paddle 221 stirs to form a homogenate.

[0047] Purification: The homogenized liquid enters the inner cylinder 31 of the purification chamber 3 through the connecting pipe 33. Under the guidance of the spiral guide core 34, the liquid comes into contact with the composite adsorption packing layer 312, and impurities such as pigments and mucus are specifically adsorbed. After the liquid enters the outer cylinder 32, it can be purified by single outflow or circulation, controlled by the diversion structure 35 and the micro circulation pump 36.

[0048] Collection and concentration: The purified liquid is introduced into the thin film evaporator 41 of the collection chamber 4 through the diversion structure 35 for evaporation and concentration. The concentrated liquid in the gas phase is liquefied through the condenser recovery unit 42 and finally received by the quantitative collection bottle 43. The weight is monitored by the high-precision weighing sensor 431.

[0049] Cleaning: After the testing task is completed, cleaning solvent can be pumped into the purification chamber 3 through the backwashing pipeline 341 to perform backwashing and regenerate the packing material.

[0050] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A processing device for detection of purple yam ginseng agricultural residues, characterized by, Includes rack, sample pretreatment chamber, purification chamber, and collection chamber. The sample pretreatment chamber includes a low-temperature pulverizing chamber and a premixing chamber located below the low-temperature pulverizing chamber. The low-temperature pulverizing chamber has a cooling chip embedded in its cavity wall, a feeding port at the top of the low-temperature pulverizing chamber, and a bottom of the low-temperature pulverizing chamber connected to the premixing chamber. The premixing chamber is equipped with a stirring paddle, and a solvent premixing spray head is provided on the side wall of the premixing chamber. The purification chamber is located directly below the premixing chamber. The purification chamber has a double-layer cylindrical structure, including an inner cylinder and an outer cylinder arranged coaxially. The top of the inner cylinder is connected to the liquid outlet of the premixing chamber through a connecting pipe. A spiral guide core is provided on the central axis inside the inner cylinder. The outer edge of the spiral blades of the spiral guide core forms a narrow fluid channel with the inner wall of the inner cylinder. The cylinder wall of the inner cylinder includes a porous sieve plate layer, a composite adsorption packing layer and a heating jacket. The bottom of the outer cylinder is provided with a diversion structure. The top of the collection chamber is connected to the diversion structure at the bottom of the outer cylinder via a pipe, and the frame is fixed to the outside of the purification chamber and the collection chamber.

2. The processing device for detecting pesticide residues in purple yam according to claim 1, characterized in that, The composite adsorption packing layer is composed of two layers of packing units with different functions tightly packed in the radial direction. The inner layer is a polyamide fiber targeting anthocyanin pigments of yam, and the outer layer is a silica microsphere targeting polysaccharides and mucilage.

3. The processing device for detecting pesticide residues in purple yam according to claim 1, characterized in that, It also includes an integrated control system, which is fixed to the side panel of the frame and electrically connected to the purification chamber and the collection chamber.

4. The processing device for detecting pesticide residues in purple yam according to claim 3, characterized in that, The integrated control system is preset with a fully automatic continuous mode and a segmented manual mode.

5. The processing device for detecting pesticide residues in purple yam according to claim 1, characterized in that, The solvent premixing spray head is equipped with an atomizing plate and is connected to an external solvent storage tank through a pipeline.

6. The processing device for detecting pesticide residues in purple yam according to claim 1, characterized in that, The collection chamber integrates a thin-film evaporator, a condenser, and a quantitative collection bottle for receiving the final concentrate. The thin-film evaporator, the condenser, and the quantitative collection bottle are connected by pipes.

7. The processing device for detecting pesticide residues in purple yam according to claim 6, characterized in that, The quantitative collection bottle is placed on a high-precision weighing sensor.

8. The processing device for detecting pesticide residues in purple yam according to claim 1, characterized in that, The connecting pipe is a corrugated pipe structure, and its two ends are connected to the liquid outlet of the premixing chamber and the top of the inner cylinder respectively by quick-connect clamps.

9. The processing device for detecting pesticide residues in purple yam according to claim 1, characterized in that, The spiral guide core has a hollow structure and a backwashing pipe extending to the bottom of the inner cylinder is installed inside. The outlet of the backwashing pipe is located at the end of the spiral guide core.

10. The processing device for detecting pesticide residues in purple yam according to claim 1, characterized in that, The outer cylinder has a three-way flow divider structure. One channel of the flow divider structure is connected to the top of the inner cylinder through a pipeline to form a circulation loop. The circulation loop is driven by a micro circulation pump.

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