Tea leaf pesticide residue detection safety screening device

Abstract

The utility model belongs to the field of tea detection, especially a kind of tea agricultural chemical residue detection safety screening equipment, for the existing equipment is difficult to guarantee the premise of the complete form of tea, reach efficient and sufficient agricultural chemical residue dissolution effect, leading to the accuracy and stability of detection result difference problem, present and propose following scheme, it includes jar body, the inside of jar body is located in upper portion and is opened with the inner placement cavity of conical shape, the inside of jar body is located in lower portion and is provided with outer liquid circulating cavity;Flow guide mechanism is arranged in the jar body, for the water after stirring is entered into inner placement cavity in spiral ascending turbulent flow.

Description

Technical Field

[0001] This utility model relates to the field of tea testing technology, and in particular to a safety screening device for detecting pesticide residues in tea. Background Technology

[0002] Pesticide residue testing in tea is a crucial step in ensuring tea quality and safety and protecting consumer health. It utilizes advanced instrumental analysis techniques, such as gas chromatography (mass spectrometry) and liquid chromatography (mass spectrometry), to accurately qualitatively and quantitatively analyze various pesticide residues that may be present in tea.

[0003] Currently, existing pesticide residue testing and safety screening equipment for tea typically relies on "surface elution" or "extraction" methods. While these methods can achieve some degree of pesticide dissolution and extraction, they have significant drawbacks. Conventional stirring paddles directly act on the tea leaves, easily breaking them apart. This not only makes the extract cloudy but also clogs the detection cards or optical sensors used for subsequent testing. Simple soaking methods, on the other hand, have extremely low pesticide residue dissolution efficiency. These methods fail to achieve efficient and thorough pesticide residue dissolution while preserving the integrity of the tea leaves, making the entire testing process highly susceptible to interference. Consequently, the accuracy and stability of the test results are significantly compromised, failing to provide reliable assurance for tea quality and safety. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies that make it difficult to achieve efficient and sufficient pesticide residue dissolution while preserving the integrity of tea leaves, resulting in poor accuracy and stability of test results. Therefore, this invention proposes a safe screening device for pesticide residue detection in tea leaves.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A safety screening device for detecting pesticide residues in tea includes:

[0007] The tank has a water inlet pipe fixedly connected to one side of its lower side, a cone-shaped inner cavity is opened at the top of the tank, and an outer liquid circulation cavity is provided at the bottom of the tank.

[0008] The tank is equipped with a stirring assembly for stirring the water entering the tank. The tank is also equipped with a flow guiding mechanism for guiding the stirred water into the inner placement cavity in a spiral upward turbulent flow. The tank is also equipped with a separation mechanism for separating solid impurities from the output liquid.

[0009] In one possible design, the stirring assembly includes a sealed, rotatable shaft located on the bottom wall of the outer liquid circulation chamber of the tank, with a stirring paddle fixedly mounted at the top of the shaft and a motor fixedly mounted at the bottom of the tank, the output shaft of the motor being fixedly connected to the bottom end of the shaft.

[0010] In one possible design, the flow guiding mechanism includes a flow guiding hood fixedly disposed within the outer liquid circulation chamber at the bottom of the inner placement chamber. The flow guiding hood is conical, and the bottom of the inner placement chamber has a plurality of evenly distributed mesh holes. A spiral flow guiding tube is fixedly disposed at each of the mesh holes at the bottom of the inner placement chamber. The spiral flow guiding tube is connected to the mesh holes, and the plurality of spiral flow guiding tubes are located inside the flow guiding hood.

[0011] In one possible design, the separation mechanism includes a water outlet pipe fixedly connected to the other side of the tank and located in the middle section. The inner end of the water outlet pipe passes through the guide shroud and communicates with its interior. The outer end of the water outlet pipe is fixedly connected to a connector. A filter plate is fixedly installed inside the connector. The same bracket is fixedly installed on both sides of the inner wall of the connector. A rotating rod is rotatably installed at the center of the bracket. A fan blade is fixedly installed at one end of the rotating rod near the water outlet pipe. An L-shaped scraper is fixedly installed at the other end of the rotating rod. The L-shaped scraper is respectively attached to the filter plate and the inner wall of the connector. A collection pipe is fixedly connected to the bottom of the connector. A collection box is threadedly connected to the other end of the collection pipe.

[0012] In one possible design, four support frames are fixedly installed in a rectangular shape on the outer bottom of the tank. Each of the four support frames is threadedly connected to a screw rod at the top. Each of the four screw rods has a suction cup rotatably installed at the bottom end and a knob fixedly installed at the top end.

[0013] In one possible design, a lid is hinged to the top opening of the tank body, and the lid is locked to the tank body by a snap fastener. A sealing gasket is fixedly provided on the lid near the opening of the tank body.

[0014] In this application, upon initial use, the operator first rotates four knobs to rotate the screw on the support frame, causing the suction cup at the bottom of the screw to descend. As the knobs are rotated until the suction cup is higher than the bottom of the tank, the tank is placed on the worktable using the suction cup. The tank is then pressed down to firmly attach the suction cup to the worktable, ensuring stable placement. When the worktable is tilted or uneven, the four knobs can be rotated sequentially to rotate the screw on the support frame, causing the suction cup at the bottom of the screw to descend. This ensures the screw and suction cup, with the longer descent distance, are at an angle or lower position, thus keeping the tank relatively level on the worktable and preventing instability during operation. After placement, the connectors and water inlet pipes are connected to the corresponding pipes, and the equipment is powered on.

[0015] Next, open the can lid. Since the can lid is locked to the can body with a snap, and a sealing gasket is fixed at the opening of the can lid near the can body, you need to first unfasten the snap, then lift the can lid, and then place the tea to be tested into the cone-shaped inner placement cavity at the top of the can body. After placing it, put the can lid back on the top opening of the can body and fasten the snap to ensure a good seal.

[0016] Then connect to an external water source through the water inlet pipe located at the bottom of one side of the tank, and inject an appropriate amount of water into the external liquid circulation chamber inside the tank. After the injection is completed, close the valve of the external water source, and then start the motor fixed at the bottom of the tank. The output shaft of the motor drives the rotating shaft to rotate, and the stirring paddle fixed at the top of the rotating shaft rotates accordingly, starting to stir the water entering the tank, so that the water flows fully in the external liquid circulation chamber.

[0017] During the stirring process of the water by the agitator, the conical guide shroud fixed at the bottom of the inner placement chamber in the outer liquid circulation chamber plays a role. Under the stirring of the agitator, the water is guided by the guide shroud and flows upward in a spiral turbulent manner along the spiral guide tube into the mesh. The water entering the mesh will re-enter the inner placement chamber, thus making the water flow into the inner placement chamber spiral. The spiral water flow will force the tea leaves in the inner placement chamber to tumble violently without contacting the mechanical agitator and the tank wall, so that the tea leaves can fully contact the water. This allows the pesticide residues in the tea leaves to dissolve better in the water while reducing damage to the tea leaves.

[0018] After stirring and tumbling for a period of time, the pesticide residues dissolved in the water will be output through the outlet pipe (the external pipe can be connected to equipment such as a water pump, so that the water pump can draw water from the tank). After the water enters the outlet pipe, it first passes through the filter plate fixed inside the connector. The filter plate performs preliminary filtration of solid impurities in the water. Driven by the water flow, the fan blades start to rotate, causing the rotating rod to rotate at the center of the support. The L-shaped scraper fixed at the other end of the rotating rod rotates accordingly. The L-shaped scraper is in contact with the filter plate and the inner wall of the connector, which can scrape off the solid impurities accumulated on the filter plate in time, prevent the filter plate from clogging, and ensure the filtration effect. The solid impurities filtered by the filter plate fall into the collection box through the collection pipe fixedly connected at the bottom of the connector under the action of gravity. The collection box is threadedly connected to the collection pipe, which is convenient for regular disassembly and cleaning. The liquid after separating the impurities is output from the other end of the connector, which can be used for subsequent pesticide residue testing and analysis.

[0019] This utility model has the following beneficial effects:

[0020] In this invention, the stirring assembly is designed so that the motor drives the stirring paddle to rotate, which fully stirs the water in the external liquid circulation chamber, thereby promoting the rapid and complete dissolution of pesticide residues in the tea leaves into the water.

[0021] In this invention, the flow guiding mechanism, with its conical flow guide cover and spiral flow guide tube working together, guides the water flow to rise along the spiral path and form turbulence when the agitator stirs the water, so that the water flow spirals and carries the tea leaves. This allows the tea leaves to tumble violently without contacting the mechanical parts, ensuring full contact with the water. This not only protects the integrity of the tea leaves but also greatly improves the dissolution efficiency of pesticide residues in the tea leaves, helping to fully dissolve the pesticide residues.

[0022] In this invention, the separation mechanism allows the filter plate to initially intercept and filter solid impurities in water containing pesticide residues as it flows out through the outlet pipe. Simultaneously, the fan blades, driven by the water flow, rotate the L-shaped scraper to promptly remove impurities from the filter plate, preventing clogging and ensuring continuous and effective filtration. The filtered impurities fall into the collection box through the collection pipe for easy centralized cleaning, ultimately achieving efficient separation of water and solid impurities. This provides a purer sample for subsequent pesticide residue testing, improving the accuracy of the test results. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall main structure of a tea pesticide residue detection and safety screening device proposed in this utility model;

[0024] Figure 2 This is a side view of the overall structure of a tea pesticide residue detection and safety screening device proposed in this utility model;

[0025] Figure 3This utility model provides a cross-sectional view of the tank and the flow guide, as well as a schematic diagram of the unfolded structure of the tank lid, for a tea pesticide residue testing and safety screening device.

[0026] Figure 4 This is a cross-sectional structural diagram of the connector of a tea pesticide residue detection and safety screening device proposed in this utility model.

[0027] In the diagram: 1. Tank body; 101. Inner cavity; 102. Outer liquid circulation cavity; 2. Tank lid; 201. Sealing gasket; 3. Flow guide; 4. Fastener; 5. Mesh; 6. Spiral guide pipe; 7. Agitator; 8. Motor; 9. Inlet pipe; 10. Outlet pipe; 11. Connector; 12. Filter plate; 13. Support; 14. Rotating rod; 15. Fan blade; 16. L-shaped scraper; 17. Collection pipe; 18. Collection box; 19. Support frame; 20. Screw; 21. Suction cup; 22. Knob. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] In one embodiment

[0030] Reference Figure 1-4 A screening device, comprising:

[0031] The tank body 1 has a water inlet pipe 9 fixedly connected to the lower side of one side for connecting to an external water source and injecting water into the tank body 1. A cone-shaped inner placement cavity 101 is opened at the upper part of the tank body 1. This inner placement cavity 101 is specifically used to place the tea leaves to be tested. An external liquid circulation cavity 102 is provided at the lower part of the tank body 1 to provide space for water stirring and circulation.

[0032] A stirring assembly is provided inside the tank 1, which includes a rotating shaft that is sealed and rotatably mounted on the bottom wall of the outer liquid circulation chamber 102 of the tank 1. A stirring paddle 7 is fixedly installed at the top of the rotating shaft. A motor 8 is fixedly installed at the bottom of the tank 1. The output shaft of the motor 8 is fixedly connected to the bottom end of the rotating shaft. When the motor 8 is started, the output shaft of the motor 8 drives the rotating shaft to rotate, thereby causing the stirring paddle 7 to rotate, so as to stir the water entering the tank 1.

[0033] The tank body 1 is also equipped with a flow guiding mechanism, which includes a flow guiding hood 3 fixedly installed at the bottom of the inner placement cavity 101 within the outer liquid circulation cavity 102. The flow guiding hood 3 is conical, and the conical flow guiding hood 3 and the conical inner placement cavity 101 together form an hourglass shape (which can create a pressure difference). The bottom of the inner placement cavity 101 has a plurality of evenly distributed mesh holes 5. A spiral flow guiding tube 6 is fixedly installed at each mesh hole 5. The spiral flow guiding tube 6 is connected to the mesh hole 5, and the plurality of spiral flow guiding tubes 6 are all located inside the flow guiding hood 3. When the stirring paddle 7 stirs the water, the water, guided by the flow guiding hood 3, will spiral upward and flow turbulently into the inner placement cavity 101 along the spiral flow guiding tube 6. This forces the tea leaves placed in the inner placement cavity 101 to tumble violently without contacting the mechanical stirring paddle 7 and the tank wall, so that the tea leaves can fully contact the water, which is beneficial to the dissolution of pesticide residues in the tea leaves and at the same time reduces damage to the tea leaves.

[0034] The tank body 1 is also equipped with a separation mechanism, which includes a water outlet pipe 10 fixedly connected to the middle section of the other side of the tank body 1. The inner end of the water outlet pipe 10 passes through the guide shroud 3 and communicates with its interior. Its outer end is fixedly connected to a connector 11. A filter plate 12 is fixedly installed inside the connector 11 to intercept solid impurities in the output liquid. The same bracket 13 is fixed on both sides of the inner wall of the connector 11. A rotating rod 14 is rotatably installed at the center of the bracket 13. A fan blade 15 is fixedly installed at the end of the rotating rod 14 near the water outlet pipe 10. When water flows through, it will push the fan blade 15 to rotate, thereby driving the rotating rod 14. 4. Rotation: An L-shaped scraper 16 is fixedly installed at the other end of the rotating rod 14. The L-shaped scraper 16 is in contact with the inner wall of the filter plate 12 and the connector 11 respectively. During the rotation of the rotating rod 14, the L-shaped scraper 16 will scrape off the solid impurities accumulated on the filter plate 12 in time to prevent the filter plate 12 from clogging. The bottom of the connector 11 is fixedly connected to a collection pipe 17. The other end of the collection pipe 17 is threaded to a collection box 18. The solid impurities filtered by the filter plate 12 are guided into the collection pipe 17 under the action of gravity and the rotation of the scraper 16, and fall into the collection box 18 through the collection pipe 17, which is convenient for regular disassembly and cleaning.

[0035] A lid 2 is hinged to the top opening of the can body 1. The lid 2 is locked to the can body 1 by a snap 4. A sealing gasket 201 is fixedly installed on the lid 2 near the opening of the can body 1. When opening the lid 2, first unfasten the snap 4, then lift the lid 2, put the tea to be tested into the inner placement cavity 101, and then put the lid 2 back on the top opening of the can body 1 and fasten the snap 4 to ensure a good seal and prevent water leakage.

[0036] This application can be used in the field of safety screening equipment for pesticide residue detection in tea, or in other fields applicable to this application.

[0037] In another embodiment, refer to Figure 1This invention relates to a tea pesticide residue detection and safety screening device. The structure of this embodiment is basically the same as the aforementioned embodiments, except that: four support frames 19 are fixedly installed in a rectangular shape on the outer side of the bottom of the tank 1. Each of the four support frames 19 has a threaded connection to a screw 20 at its top. Each of the four screws 20 has a suction cup 21 rotatably mounted at its bottom end, and a knob 22 is fixedly mounted at the top end of each screw 20. Before using the device, the operator can rotate the knob 22 according to the condition of the workbench, causing the screw 20 to rotate on the support frame 19, thus lowering the suction cup 21 at the bottom end of the screw 20. If the workbench is tilted or uneven, the screw 20 and suction cup 21 with the longer descent distance can be positioned at an inclined or lower position, ensuring that the tank 1 is relatively horizontal when placed on the workbench. Then, the tank 1 is placed on the workbench using the suction cup 21, and the tank 1 is pressed down to firmly attach the suction cup 21 to the workbench, ensuring the device is placed stably.

[0038] However, as is well known to those skilled in the art, the working principle and wiring method of motor 8 are conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0039] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0040] 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 safety screening device for detecting pesticide residues in tea, characterized in that, include: Tank (1), with a water inlet pipe (9) fixedly connected to one side of the tank (1) at the bottom, a cone-shaped inner placement cavity (101) is opened at the top inside the tank (1), and an outer liquid circulation cavity (102) is provided at the bottom inside the tank (1); The tank (1) is equipped with a stirring assembly for stirring the water entering the tank (1). The tank (1) is equipped with a flow guiding mechanism for guiding the stirred water into the inner placement cavity (101) in a spiral upward turbulent flow. The tank (1) is also equipped with a separation mechanism for separating solid impurities from the liquid in the output liquid.

2. The tea pesticide residue detection and safety screening device according to claim 1, characterized in that, The stirring assembly includes a sealed, through-rotating shaft located on the bottom wall of the outer liquid circulation chamber (102) of the tank (1), and a stirring paddle (7) is fixedly installed at the top of the shaft. A motor (8) is fixedly installed at the bottom of the tank (1), and the output shaft of the motor (8) is fixedly connected to the bottom end of the shaft.

3. The tea pesticide residue detection and safety screening device according to claim 2, characterized in that, The flow guiding mechanism includes a flow guiding hood (3) fixedly installed in the outer liquid circulation chamber (102) at the bottom of the inner placement chamber (101). The flow guiding hood (3) is conical. The bottom of the inner placement chamber (101) is provided with a plurality of evenly distributed mesh holes (5). The bottom of the inner placement chamber (101) is provided with a spiral flow guiding tube (6) at each of the plurality of mesh holes (5). The spiral flow guiding tube (6) is connected to the mesh holes (5). The plurality of spiral flow guiding tubes (6) are located inside the flow guiding hood (3).

4. The tea pesticide residue detection and safety screening device according to claim 1, characterized in that, The separation mechanism includes a water outlet pipe (10) fixedly connected to the other side of the tank (1) and located in the middle section. The inner end of the water outlet pipe (10) passes through the guide shroud (3) and communicates with its interior. The outer end of the water outlet pipe (10) is fixedly connected to a connector (11). A filter plate (12) is fixedly installed inside the connector (11). The same bracket (13) is fixedly installed on both sides of the inner wall of the connector (11). A rotating rod (14) is rotatably installed at the center of the bracket (13). A fan blade (15) is fixedly installed at one end of the rotating rod (14) near the water outlet pipe (10). An L-shaped scraper (16) is fixedly installed at the other end of the rotating rod (14). The L-shaped scraper (16) is respectively attached to the inner wall of the filter plate (12) and the connector (11). A collection pipe (17) is fixedly connected to the bottom of the connector (11). A collection box (18) is threadedly connected to the other end of the collection pipe (17).

5. The tea pesticide residue detection and safety screening device according to claim 1, characterized in that, The bottom outer side of the tank (1) is fixedly provided with four support frames (19) in a rectangular shape. The top of each of the four support frames (19) is threadedly connected with a screw (20). The bottom of each of the four screws (20) is rotatably provided with a suction cup (21). The top of each of the four screws (20) is fixedly provided with a knob (22).

6. The tea pesticide residue detection and safety screening device according to claim 1, characterized in that, A can lid (2) is hinged to the top opening of the can body (1). The can lid (2) is locked to the can body (1) by a buckle (4). A sealing gasket (201) is fixedly provided on the can lid (2) near the opening of the can body (1).

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