A centrifuge for pesticide detection

Abstract

The utility model discloses a centrifugal machine for pesticide detection, including the case, its inside is established operation cavity, and the top hinged cover, processing mechanism, it includes drive end, connecting disc and centrifugal disc, drive end setting in operation cavity, just the output shaft of drive end is provided with connecting disc, and the detachable connection of connecting disc has centrifugal disc, the circumferential of centrifugal disc is provided with a plurality of centrifugal grooves, and the movable groove is provided with the communication of any one centrifugal groove.

Description

Technical Field

[0001] This utility model relates to the field of agricultural technology, specifically to a centrifuge for pesticide detection. Background Technology

[0002] A centrifuge is a machine that uses centrifugal force to separate the components of a mixture of liquid and solid particles or liquid and liquid. Centrifuges are mainly used to separate solid particles from liquid in suspension or to separate two immiscible liquids with different densities in emulsion. In the process of pesticide testing, centrifugation equipment is needed to perform rotational centrifugation testing on pesticides. Common centrifuges for pesticide testing usually include a chassis, a drive motor, a rotating shaft and centrifuge trays mounted on it. The centrifuge trays are equipped with multiple centrifuge troughs for placing test tubes. In actual use, test tubes are inserted into the centrifuge tank and rotate at high speed with the centrifuge disc. However, existing centrifuge discs lack effective test tube clamping and fixing structures. Most traditional centrifuges have a simple through-hole structure in the centrifuge tank, and test tubes are inserted into it by gravity alone. During acceleration and deceleration at start-up or stop, or during high-speed rotation, unbalanced vibration can easily cause test tubes to tilt, shift, or even fly out. This can not only lead to sample spillage and cross-contamination, affecting test results, but may also cause equipment damage or safety accidents in more serious cases. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide a centrifuge for pesticide testing. This solves the problem that existing centrifuges for pesticide testing do not have corresponding limiting mechanisms in the centrifuge holes, which makes it easy for test tubes to tilt, shift, or even fly out during high-speed rotation. This not only leads to sample spillage and cross-contamination, affecting test results, but may also cause equipment damage or safety accidents in more serious cases.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, this utility model provides a centrifuge for pesticide detection, comprising: The chassis has an operating cavity inside and a cover plate hinged to the top. The processing mechanism includes a drive end, a connecting plate, and a centrifugal disc. The drive end is disposed in the operating cavity, and the output shaft of the drive end is provided with a connecting plate. The centrifugal disc is detachably connected to the connecting plate. The centrifugal disc has a plurality of centrifugal grooves circumferentially opened. Any centrifugal groove is connected to a movable groove, and the plurality of movable grooves are connected to an annular groove at the center of the centrifugal disc. The clamping mechanism includes a clamping end, an elastic bearing end, and a pushing end. The clamping end is movably connected to the movable groove, and the end of the clamping end is hinged to the pushing end through the elastic bearing end. The pushing end is used to push the clamping end to clamp the test tube in the centrifuge tank.

[0005] In some embodiments, the chassis is provided with multiple operation buttons, and a power supply wire is connected to the outside of the chassis.

[0006] In some embodiments, the drive end includes a drive motor and a shaft. The drive motor is installed inside the operating cavity, and the output end of the drive motor is connected to the shaft. The upper end of the shaft is connected to a connecting plate.

[0007] In some embodiments, the connecting plate has multiple positioning holes, and multiple positioning grooves are provided near the positioning holes and on the outer periphery of the connecting plate. Each positioning groove has two first screw holes, and the centrifugal disc is detachably connected to the connecting plate.

[0008] In some embodiments, the lower end of the centrifuge disc is provided with a positioning post corresponding to each of the positioning holes, and the outer periphery of the centrifuge disc is provided with a positioning block that cooperates with the positioning groove, and the positioning block is provided with a plurality of second screw holes.

[0009] In some embodiments, the clamping end includes a limiting rod, which is movably connected to the movable groove. One end of the limiting rod has a recess, and the other end of the limiting rod is connected to an elastic bearing end.

[0010] In some embodiments, the elastic bearing end includes a plurality of bearing plates, and an arc-shaped bearing plate is fixed to the end of any one of the limiting rods. A spring damper is provided between the bearing plate and the inner wall of the annular groove, and the pushing end is hinged to the side of the arc-shaped plate facing away from the limiting rod.

[0011] In some embodiments, the pushing end includes a movable push rod, a threaded block, and a threaded rod; one end of the movable push rod is hinged to the bearing plate, and the other end is hinged to the threaded block, which is threadedly connected to the threaded rod.

[0012] In some embodiments, the cross-section of the threaded block is hexagonal, and a rotating handle is fixed to the upper end of the threaded rod, with an anti-slip strip provided on the outer periphery of the rotating handle.

[0013] In some embodiments, the inner wall of any one of the centrifuge tanks is provided with a rubber layer.

[0014] Compared with the prior art, the centrifuge for pesticide testing provided by this utility model has a movable groove on the centrifuge plate that communicates with the centrifuge tank, and an annular groove that communicates with the movable groove. By driving the clamping end to move through the pushing end, the test tubes in the centrifuge tank can be actively clamped. Compared with the traditional fixing method that relies solely on gravity insertion, this structure can apply radial constraint force to the test tubes before centrifugation, which significantly enhances the stability of the test tubes during high-speed rotation. It effectively prevents the test tubes from tilting, slipping, or even breaking and flying out due to acceleration, deceleration, or vibration, greatly improving the safety of equipment operation and avoiding the risks of sample leakage, cross-contamination, and equipment damage. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of a centrifuge for pesticide testing provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the internal working chamber of a centrifuge for pesticide testing provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the processing mechanism of a centrifuge for pesticide testing provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of the centrifuge disc structure of a centrifuge for pesticide testing provided in an embodiment of this utility model; Figure 5 This invention relates to a centrifuge for pesticide testing, as provided in this embodiment. Figure 2 A side view; Figure 6 This is a top view of the centrifuge disc of a centrifuge for pesticide testing provided in an embodiment of this utility model.

[0016] Explanation of reference numerals in the attached drawings: 1. Chassis; 11. Operating chamber; 12. Cover plate; 13. Operating button; 14. Power supply wire; 2. Machining mechanism; 21. Drive end; 211. Drive motor; 212. Shaft; 22. Connecting plate; 221. Positioning hole; 222. Positioning groove; 2221. First screw hole; 23. Centrifuge disc; 231. Centrifuge groove; 232. Movable groove; 233. Annular groove; 234. Positioning post; 235. Positioning block; 2351. Second screw hole; 3. Clamping mechanism; 31. Clamping end; 311. Limiting rod; 3111. Recessed part; 32. Elastic bearing end; 321. Bearing plate; 322. Spring damper; 33. Push end; 331. Movable push rod; 332. Threaded block; 333. Threaded rod; 334. Rotating handle. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a centrifuge for pesticide detection according to one embodiment of the present invention. A centrifuge for pesticide detection includes: The chassis 1 has an operating cavity 11 inside and a cover plate 12 hinged to the top. The processing mechanism 2 includes a drive end 21, a connecting plate 22, and a centrifugal disc 23. The drive end 21 is located in the operating cavity 11, and the connecting plate 22 is provided on the output shaft of the drive end 21. The centrifugal disc 23 is detachably connected to the connecting plate 22. The centrifugal disc 23 has several centrifugal grooves 231 circumferentially opened. Any centrifugal groove 231 is connected to a movable groove 232. The multiple movable grooves 232 are connected to the annular groove 233 at the center of the centrifugal disc 23. The clamping mechanism 3 includes a clamping end 31, an elastic bearing end 32, and a pushing end 33. The clamping end 31 is movably connected to the movable groove 232, and the end of the clamping end 31 is hinged to the pushing end 33 through the elastic bearing end 32. The pushing end 33 is used to push the clamping end 31 to clamp the test tube in the centrifuge tank 231.

[0019] In this embodiment, by setting a movable groove 232 communicating with the centrifugation tank 231 on the centrifugation plate 23, and setting an annular groove 233 communicating with the movable groove 232, the clamping end 31 is driven to move by the pushing end 33, thereby realizing the active clamping of the test tube in the centrifugation tank 231. Compared with the traditional fixing method that only relies on gravity insertion, this structure can apply radial constraint force to the test tube before centrifugation, which significantly enhances the stability of the test tube during high-speed rotation, effectively preventing the test tube from tilting, slipping or even breaking and flying out due to acceleration, deceleration or vibration, greatly improving the safety of equipment operation, and avoiding the risk of sample leakage, cross-contamination and equipment damage.

[0020] In one embodiment, please refer to Figures 1-4 To improve the working efficiency of the device, the chassis 1 is equipped with multiple operation buttons 13, and the outside of the chassis 1 is connected to a power supply wire 14. The drive end 21 includes a drive motor 211 and a shaft 212. The drive motor 211 is installed in the operating cavity 11, and the output end of the drive motor 211 is connected to the shaft 212. The upper end of the shaft 212 is connected to a connecting plate 22.

[0021] In this embodiment, a partition is installed inside the operating cavity 11, and a drive motor 211 is installed at the lower end of the partition. A shaft 212 is connected to the drive motor 211, and the shaft 212 passes through the partition and is connected to a connecting plate 22. Multiple operation buttons 13 are installed on the chassis 1, forming an intuitive and convenient operating interface. Users can start the device directly from the device itself. The standardized external power supply achieved by the power supply wire 14 ensures that the device can be quickly connected to the power supply and put into operation, further enhancing the flexibility and response speed of use. The drive end 21 consists of the drive motor 211 and the shaft 212. The drive motor 211, as the core power source, is installed inside the operating cavity 11. Its output end is rigidly connected to the drive shaft 212, and the upper end of the shaft 212 is connected to the connecting plate 22, thereby driving the centrifugal disk 23 to rotate at high speed. This power transmission path has a compact structure and high transmission efficiency. With high efficiency, it can achieve precise control and rapid response of rotation speed, ensuring that centrifugal force acts stably on the sample, meeting the precise requirements of centrifugation parameters for different pesticide testing items, and ensuring the repeatability and accuracy of test results. A partition is set in the operating chamber 11, and the drive motor 211 is arranged at the lower end of the partition. The shaft 212 passes through the partition and connects to the upper connecting plate 22, forming an upper and lower chamber layout with the upper chamber as the centrifugation area and the lower chamber as the drive area. The upper chamber is used to accommodate the centrifugation plate 23, test tubes and clamping mechanism 3, which facilitates sample loading, unloading and observation. The lower chamber centrally arranges the drive motor 211, circuit and other electrical components. The partition effectively blocks sample splashing, condensate dripping or chemical gas rising that may occur during centrifugation, preventing them from contaminating or corroding the motor, circuit and other core components, avoiding safety accidents such as short circuits and leakage, and significantly improving the safety and long-term reliability of the equipment.

[0022] In one embodiment, please refer to Figure 3 - Figure 6 To facilitate the installation and removal of the connecting plate 22 and the centrifugal disc 23, the connecting plate 22 is provided with multiple positioning holes 221, and multiple positioning grooves 222 are provided near the positioning holes 221 and on the outer periphery of the connecting plate 22. Each positioning groove 222 is provided with two first screw holes 2221. The centrifugal disc 23 is detachably connected to the connecting plate 22. The lower end of the centrifugal disc 23 is provided with positioning posts 234 that correspond one-to-one with the positioning holes 221, and the outer periphery of the centrifugal disc 23 is provided with positioning blocks 235 that cooperate with the positioning grooves 222. Multiple second screw holes 2351 are provided on the positioning blocks 235.

[0023] In this embodiment, by providing multiple positioning holes 221 and positioning grooves 222 on the connecting plate 22, and opening a first screw hole 2221 in the positioning groove 222, and simultaneously providing positioning posts 234 corresponding to the positioning holes 221 at the lower end of the centrifugal plate 23, and providing positioning blocks 235 that cooperate with the positioning grooves 222 on the outer periphery, and opening a second screw hole 2351 in the positioning block 235, a detachable connection structure is formed, realizing rapid positioning and reliable locking between the centrifugal plate 23 and the connecting plate 22, significantly improving assembly efficiency and operational safety. The positioning posts 234 and the positioning grooves 222 are connected to the centrifugal plate 23. The fit of the positioning hole 221 ensures precise axial and circumferential positioning of the centrifuge disc 23 during installation, avoiding eccentricity; the engagement of the positioning block 235 and the positioning groove 222 further enhances the circumferential anti-torsion capability, preventing relative slippage during high-speed rotation; the bolt connection between the first screw hole 2221 and the second screw hole 2351 achieves multi-point uniform fastening, ensuring the structural stability and dynamic balance performance of the centrifuge disc 23 at high speeds. At the same time, the device is easy to disassemble and assemble, which is conducive to cleaning, maintenance and disinfection, and is particularly suitable for pesticide residue analysis scenarios that require frequent sample changes or different testing items.

[0024] In one embodiment, please refer to Figure 1 - Figure 6 To improve the clamping efficiency of the test tube, the clamping end 31 includes a limiting rod 311, which is movably connected to the movable groove 232. One end of the limiting rod 311 has a recess 3111, and the other end of the limiting rod 311 is connected to an elastic bearing end 32. The elastic bearing end 32 includes several bearing plates 321, and an arc-shaped bearing plate 321 is fixed to the end of any one of the limiting rods 311. A spring damper 322 is provided between the bearing plate 321 and the inner wall of the annular groove 233, and the arc-shaped plate faces away from the limiting rod. One side of 311 is hinged to a push end 33, which includes a movable push rod 331, a threaded block 332, and a threaded rod 333. One end of the movable push rod 331 is hinged to the bearing plate 321, and the other end is hinged to the threaded block 332. The threaded block 332 is threaded to the threaded rod 333. The cross-section of the threaded block 332 is hexagonal, and a rotating handle 334 is fixed at the upper end of the threaded rod 333. The outer periphery of the rotating handle 334 is provided with anti-slip strips, and the inner wall of any centrifugal tank 231 is provided with a rubber layer.

[0025] In this embodiment, firstly, the clamping end 31 is composed of a limiting rod 311 movably connected within the movable groove 232. One end of the limiting rod 3111 has a recessed portion 3111. This structure can adapt to the bottom or shoulder of test tubes with different outer diameters, forming a partial covering clamping, effectively preventing the test tube from shaking or falling out radially and axially. The other end of the limiting rod 311 is connected to an elastic bearing end 32. This bearing end consists of an arc-shaped bearing plate 321 fixed to the end of the limiting rod 311, and a spring damper 322 disposed between the bearing plate 321 and the inner wall of the annular groove 233, forming a... The elastic support structure allows for compression deformation of the spring damper 322 when clamping force is applied to the pushing end 33, providing excellent elastic buffering capability. This allows it to accommodate test tubes with certain dimensional tolerances, improving equipment versatility. Furthermore, it absorbs impact energy during centrifugal start-up, braking, or momentary vibration, preventing test tube breakage due to rigid clamping and effectively protecting sample integrity. The pushing end 33 consists of a movable push rod 331, a threaded block 332, and a threaded rod 333. The two ends of the movable push rod 331 are hinged to the bearing plate 321 and the threaded block 332, respectively. 32. The threaded block 332 is threaded onto the vertically arranged threaded rod 333. By rotating the threaded rod 333, the threaded block 332 moves axially, which in turn pushes the movable push rod 331 to swing, driving the limiting rod 311 to move radially, thus achieving synchronous clamping or release of the test tubes. This linkage mechanism converts rotational motion into multi-point radial clamping action. It has a compact structure and stable force transmission, ensuring that all test tubes are subjected to uniform force and avoiding eccentric vibration caused by uneven clamping. In particular, the threaded block 332 has a hexagonal cross-section, which facilitates the hinged connection of the movable push rod 333 on all six sides. 31; The top of the threaded rod 333 is equipped with a rotating handle 334 for easy manual operation. The handle is also equipped with anti-slip strips to enhance grip friction. Even when operating with gloves, clamping adjustment can be easily completed, significantly improving the human-machine interaction experience and operational safety. In addition, the inner wall of the centrifuge tank 231 is equipped with a rubber layer, which further enhances the flexible protection of the outer wall of the test tube, avoiding direct contact between metal parts and causing scratches or stress concentration. At the same time, the rubber layer has a good coefficient of friction, which can effectively prevent the test tube from slipping relative to each other during high-speed rotation, improving clamping reliability.

[0026] To better understand this utility model, the following is combined with... Figures 1 to 6The technical solution of this utility model is described in detail as follows: The centrifuge is placed on a stable and ventilated experimental platform. An external power supply is connected via the power supply wire 14 on the outside of the casing 1. The operator starts the equipment using the operation button 13 on the surface of the casing 1. The system performs a self-check, confirming that the cover 12 is closed and that the motor and control module are functioning normally. Then, it enters standby mode. The hinged cover 12 at the top of the casing 1 is opened, exposing the internal operating chamber 11. The connecting plate 22 inside the operating chamber 11 is checked for cleanliness and integrity. The centrifuge tray 23 of the required size is aligned with the connecting plate 22 for installation, ensuring that the positioning post 234 at the lower end of the centrifuge tray 23 is inserted into the positioning hole 221 on the connecting plate 22. Simultaneously, the positioning block 2 on the outer periphery of the centrifuge tray 23... The centrifuge disc 23 is embedded in the positioning groove 222 on the outer periphery of the connecting disc 22 to achieve precise axial and circumferential positioning. Then, bolts are passed through the second screw hole 2351 on the positioning block 235 and tightened with the first screw hole 2221 on the positioning groove 222, completing the multi-point uniform fixing of the centrifuge disc 23. This structure ensures that the centrifuge disc 23 is installed quickly, positioned accurately, and connected firmly, effectively preventing eccentricity or loosening during high-speed rotation. Test tubes containing pesticide samples are inserted one by one into the centrifuge grooves 231 on the centrifuge disc 23. Because the inner wall of the centrifuge groove 231 is lined with a rubber layer, it effectively buffers the contact between the test tubes and the groove wall, preventing scratches or stress concentration. To ensure dynamic balance, a mass should typically be placed in the centrifuge grooves 231 at symmetrical positions. Using sample tubes of similar quantity, or empty sample tubes for counterweight, the operator rotates the handle 334 located in the center of the centrifuge disc 23. Rotating the handle 334 causes the threaded rod 333, which is fixed to it, to rotate. Since the threaded block 332 has a hexagonal cross-section, with each face hinged to a movable push rod 331, the threaded block 332 can only move up and down along the axial direction of the threaded rod 333. When the threaded rod 333 rotates, the threaded block 332 moves downward along the axial direction under the action of the thread. The movement of the threaded block 332 causes one end of the movable push rod 331 to move synchronously. The other end of the movable push rod 331 is hinged to the arc-shaped support plate 321. Since the support plate 321 is fixedly connected to the limiting rod 311, this movement is converted into a limiting rod movement. 311 moves radially along the movable groove 232, thereby pressing the outer wall of the test tube. During the clamping process, the spring damper 322 is located between the support plate 321 and the inner wall of the annular groove 233. It is compressed as the support plate 321 swings, providing elastic pre-tightening force. This elastic structure gives the clamping force buffering characteristics, which can not only adapt to the slight differences of test tubes of different diameters, but also absorb the impact when centrifuging starts or vibrates, preventing the test tube from breaking due to rigid clamping. Since all clamping ends 31 are linked to the threaded block 332 driven by the same threaded rod 333 through their respective movable push rods 331, all test tubes can be clamped synchronously by rotating one handle. The operation is simple, efficient, and the clamping is uniform, ensuring the dynamic balance of the centrifuge disc 23. Subsequent operators set centrifugation parameters via operation button 13 on chassis 1, including target rotation speed (e.g., 3000–10000 rpm) and centrifugation time (e.g., 5–30 minutes). After confirming the parameters are correct, the centrifugation program is started. At this time, drive motor 211 is powered on and its output drives shaft 212 to rotate at high speed. Shaft 212 passes through the partition and is connected to connecting plate 22 at the upper end, thereby driving the entire centrifuge plate 23 and the clamped test tubes to rotate synchronously. The partition isolates drive motor 211 in the lower part of operating chamber 11, effectively preventing sample splashing, condensate, or corrosion that may occur in the upper centrifugation area. Corrosive gases can enter, protecting the motor and circuit. At the same time, the partition enhances structural rigidity, reduces vibration and noise, and ensures smooth operation. After centrifugation, open the cover plate 12, rotate the handle 334 in the opposite direction to make the threaded rod 333 rotate in the opposite direction, the threaded block 332 moves upward, the movable push rod 331 pulls the bearing plate 321 to reset, and the limit rod 311 retracts into the movable groove 232 under the reset force of the spring damper 322. The recessed part 3111 disengages from the outer wall of the test tube, releasing the clamping state. At this time, the test tube can be easily removed from the centrifuge tank 231 for subsequent pesticide residue detection and analysis.

[0027] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A centrifuge for pesticide detection, characterized in that, include: The chassis has an operating cavity inside and a cover plate hinged to the top. The processing mechanism includes a drive end, a connecting plate, and a centrifugal disc. The drive end is disposed in the operating cavity, and the output shaft of the drive end is provided with a connecting plate. The centrifugal disc is detachably connected to the connecting plate. The centrifugal disc has a plurality of centrifugal grooves circumferentially opened. Any centrifugal groove is connected to a movable groove, and the plurality of movable grooves are connected to an annular groove at the center of the centrifugal disc. The clamping mechanism includes a clamping end, an elastic bearing end, and a pushing end. The clamping end is movably connected to the movable groove, and the end of the clamping end is hinged to the pushing end through the elastic bearing end. The pushing end is used to push the clamping end to clamp the test tube in the centrifuge tank.

2. A centrifuge for pesticide detection according to claim 1, characterized in that: The chassis is equipped with multiple operation buttons, and a power supply wire is connected to the outside of the chassis.

3. A centrifuge for pesticide detection according to claim 1, characterized in that: The drive end includes a drive motor and a shaft. The drive motor is installed inside the operating cavity, and the output end of the drive motor is connected to the shaft. The upper end of the shaft is connected to a connecting plate.

4. A centrifuge for pesticide detection according to claim 3, characterized in that: The connecting plate has multiple positioning holes, and multiple positioning grooves are provided near the positioning holes and on the outer periphery of the connecting plate. Each positioning groove has two first screw holes. The centrifugal disc is detachably connected to the connecting plate.

5. A centrifuge for pesticide detection according to claim 4, characterized in that: The lower end of the centrifuge disc is provided with positioning posts that correspond one-to-one with the positioning holes, and the outer periphery of the centrifuge disc is provided with positioning blocks that cooperate with the positioning grooves. The positioning blocks are provided with multiple second screw holes.

6. A centrifuge for pesticide detection according to claim 1, characterized in that: The clamping end includes a limiting rod, which is movably connected to the movable groove. One end of the limiting rod has a recess, and the other end of the limiting rod is connected to an elastic bearing end.

7. A centrifuge for pesticide detection according to claim 6, characterized in that: The elastic bearing end includes several bearing plates, and an arc-shaped bearing plate is fixed to the end of any of the limiting rods. A spring damper is provided between the bearing plate and the inner wall of the annular groove. The pushing end is hinged to the side of the arc-shaped plate facing away from the limiting rod.

8. A centrifuge for pesticide detection according to claim 7, characterized in that: The pushing end includes a movable push rod, a threaded block, and a threaded rod; one end of the movable push rod is hinged to the bearing plate, and the other end is hinged to the threaded block, and the threaded block is threadedly connected to the threaded rod.

9. A centrifuge for pesticide detection according to claim 8, characterized in that: The threaded block has a hexagonal cross-section, and a rotating handle is fixed to the upper end of the threaded rod. An anti-slip strip is provided on the outer periphery of the rotating handle.

10. A centrifuge for pesticide detection according to claim 1, characterized in that: The inner wall of any one of the centrifuge tanks is provided with a rubber layer.

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