Device for detecting pesticide residues on surface of wild jujube

Abstract

The invention discloses a wild jujube surface pesticide residue detection device, which comprises: a detection unit, which is used for carrying out residue detection on pesticide on the surface of a detected object through a reflection spectrum; the cleaning unit is used for dissolving pesticide in a solution through ultrasonic cleaning; and the bearing unit is arranged between the detection unit and the cleaning unit and acts corresponding to the actions of the detection unit and the cleaning unit. According to the scheme, the spectral information of the pesticide residues on the skin and the pesticide concentration information of the solution are collected, and more accurate pesticide residue information on the skin of the wild jujube is obtained through comprehensive calculation.

Description

Technical Field

[0001] This invention relates to the field of pesticide detection technology, and in particular to a device for detecting pesticide residues on the surface of jujubes. Background Technology

[0002] Pesticide residues refer to traces of any specific pesticide or its metabolites, degradation products, and reaction products found in agricultural products and their processed products. Pesticide residues are a significant factor affecting food safety, making their detection extremely important.

[0003] Existing devices for detecting pesticide residues using spectroscopy and solutions both have certain limitations. For example, spectral detection is easily affected by interference, while solution detection is relatively slow. Summary of the Invention

[0004] To address the problems of existing technologies, this invention provides a device for detecting pesticide residues on the surface of jujube trees. The technical solution is as follows: A detection unit, wherein the detection unit is used to detect pesticide residues on the surface of the test object by means of reflectance spectroscopy; A cleaning unit, wherein the cleaning unit is used to dissolve pesticides in a solution by ultrasonic cleaning; A support unit is disposed between the detection unit and the cleaning unit, and operates in response to the actions of the detection unit and the cleaning unit. The carrier unit includes: A fixed ring is disposed between the detection unit and the cleaning unit. A support rod and a movable rod assembly hinged to the support rod are movably connected to the fixed ring. The movable rod assembly includes a first movable rod and a second movable rod. A foldable platform is disposed between the first side of the first movable rod and the first side of the second movable rod. The support rod includes a strip-shaped hole opened in the middle of the support rod; A telescopic rod, which passes through the slot and is connected to a locking structure, the locking structure abutting against the first side of the first movable rod and the first side of the second movable rod; The slotted hole is configured to define the movement path of the telescopic rod.

[0005] Furthermore, the detection unit includes a laser source and a spectroscopic camera. The laser source is used to emit irradiation light onto the surface of the object being tested, and the spectroscopic camera is used to collect the reflected light formed on the surface of the object being tested by the irradiation light.

[0006] Furthermore, the cleaning unit includes a cleaning tank and a transducer array disposed in the cleaning tank. The cleaning tank is spherical, and the ultrasonic array is distributed on the spherical surface of the cleaning tank.

[0007] Furthermore, the supporting unit also includes: A drive mechanism is used to drive the support rod to move; A driving mechanism is used to drive the movable lever assembly; The pushing mechanism includes a rotating platform and a telescopic mechanism that is dynamically driven by the rotating platform, and the telescopic rod is disposed in the telescopic mechanism.

[0008] Furthermore, the fixing ring also includes: An arc-shaped through hole is provided, which is not coaxial with the fixing ring, and is configured to limit the movement path of the support rod.

[0009] Furthermore, the support rod is positioned on the fixing ring, and the fixing ring is provided with an arc-shaped through hole corresponding to the support rod. The arc-shaped through hole is configured as the moving path of the support rod.

[0010] Furthermore, the fixing ring also includes: The groove located on the inner side of the fixed ring is used to limit the position of one end of the first and second movable rods away from the hinged portion of the first and second movable rods with the support rod.

[0011] Furthermore, the groove includes: Limiting groove; Elastic ropes are provided at the ends of the first movable rod and the second movable rod away from the hinge portion; The elastic cord is configured to reset the first movable rod and the second movable rod.

[0012] Furthermore, the transmitting end of each ultrasonic transducer in the transducer array is pointed towards the center of the cleaning tank.

[0013] Furthermore, the cleaning unit includes: A cleaning tank having a water outlet pipe connected to a solution detector for collecting and detecting pesticide information in the solution discharged through the water outlet pipe.

[0014] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: 1. Single-spectral methods are susceptible to matrix interference (such as pigments and moisture), while single-solution methods (such as enzyme inhibition) may be affected by other inhibitors. The device can first identify suspicious regions or components through rapid spectral scanning, and then perform highly specific solution biochemical detection (such as ELISA and enzyme inhibition) on the suspicious samples. The results of the two methods are used to verify each other, which significantly reduces the false positive rate.

[0015] 2. Spectroscopic methods (especially broad-spectrum techniques such as NIR) respond to a wide variety of substances; solution methods can be designed for specific pesticides (such as ELISA for specific organophosphates). When combined, the device can detect far more types of pesticides than a single method.

[0016] 3. The integrated device combining spectroscopy and solution detection achieves "rapid screening + precise inspection" through complementary advantages, process coordination, and data fusion. It can significantly improve accuracy, reliability, efficiency, detection range, and intelligence level. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is the pesticide residue detection device provided in the embodiments of the present invention; Figure 2 This is the detection unit of the pesticide residue detection device provided in the embodiments of the present invention; Figure 3 This is the cleaning unit of the pesticide residue detection device provided in the embodiments of the present invention; Figure 4a This is a top view of the cover assembly of the pesticide residue detection device provided in an embodiment of the present invention; Figure 4b This is a top view of the cover assembly of the pesticide residue detection device provided in an embodiment of the present invention; Figure 5a This is a bottom view of the cover assembly of the pesticide residue detection device provided in an embodiment of the present invention; Figure 5b This is a bottom view of the cover assembly of the pesticide residue detection device provided in an embodiment of the present invention; Figure 6 This is a bottom view of the cover assembly of the pesticide residue detection device provided in an embodiment of the present invention; Figure 7 This is a cross-sectional view of the cover assembly of the pesticide residue detection device provided in an embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the principle of spectral detection in the pesticide residue detection device provided in this embodiment of the invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] In practical applications, the detection of pesticide residues on fruit surfaces typically employs hyperspectral imaging (HSI) technology. This involves collecting spectral information from the surface and interior of jujubes in the visible-near infrared (Vis-NIR, 380–1700 nm) and short-wave infrared (SWIR, 1000–2500 nm) bands. By combining this with chemometric models to establish a correlation between pesticide residues and spectral characteristics, this method can be used to detect pesticide residues (such as chlorpyrifos and imidacloprid). However, this detection method is not flexible enough and lacks specificity for detecting pesticide residues on the surface of specific fruits, such as jujubes. Furthermore, the limitations of the detection methods often exist when using hyperspectral technology to detect pesticide residues on fruit surfaces, leading to inaccurate results.

[0021] Therefore, in order to solve the above-mentioned technical problems, such as Figure 1 , Figure 2As shown in the figure, this embodiment of the invention provides a pesticide residue detection device for the surface of jujube, including a detection unit for detecting the sample to be tested, a cleaning unit for cleaning the sample to be tested, and a housing (not shown) for encapsulating the detection unit and the cleaning unit. The detection unit includes a top plate 101, a side body 102, and a fixing rod 103 for fixing the top plate 101 to the side body 102. The top plate 101 is positioned above the side body 102, and a feed inlet is provided between the top plate 101 and the side body 102. The bottom of the top plate 101 is provided with... A laser source 105 is provided, which is installed on a fixed plate 106 connected to a fixed rod 103. A hyperspectral camera 104 is provided below the side body 102. The hyperspectral camera 104 is used to receive light emitted by the laser source 105 and reflected by the object 500. To support the object 500, a support unit 300 is provided below the detection unit. When the object 500 enters through the feed port and falls and accumulates on the support unit 300, spectral detection is performed. A cleaning unit is provided below the support unit 300. The cleaning unit uses... Ultrasonic cleaning unit includes a cleaning tank 201. Several through holes 202 are formed on the side wall of the cleaning tank 201. Transducers 203 can be installed within the through holes 202. By installing transducers 203 within the multiple through holes 202, a transducer array is formed to perform ultrasonic cleaning on the test object 500 within the cleaning tank 201. A water inlet pipe 204 is provided on one side of the cleaning tank 201, and a water outlet pipe 205 is provided at the bottom of the cleaning tank 201. The water inlet pipe 204 and the water outlet pipe 205 are used to replace the liquid used for cleaning the test object 500. Pipeline 205 can also be connected to solution detector 206, which is used to detect the liquid containing pesticide components on the surface of the test sample 500, obtained from the cleaning of the test sample 500 discharged from the outlet pipe 205. Solution detector 206 contains specific reagents (such as enzymes, antibodies, and chromogenic agents) that can specifically interact with the target pesticide (such as inhibiting enzyme activity, antigen-antibody binding, and color reactions), causing measurable changes in certain physicochemical properties of the solution (such as color, absorbance, fluorescence intensity, and electrochemical signal). These changes are related to the pesticide concentration.

[0022] like Figure 3 As shown, in order to facilitate the provision of a stage for the test object 500 during spectral detection, the support unit 300 may include a fixed ring 301, a support rod 302 disposed in the fixed ring, and a movable rod assembly 303 connected to the support rod 302, wherein the movable rod assembly 303 is provided with a stage (not shown in the figure) that can be opened and closed by the movement of the movable rod assembly 303.

[0023] like Figure 4a , 4bAs shown, a support rod 302 is movably connected to one side of the fixed ring 301. The fixed ring 301 has an arc-shaped through hole 307 that is not coaxial with the fixed ring 301. The support rod 302 is slidably disposed in the arc-shaped through hole 307 via a connector. To automatically drive the support rod 302, a drive mechanism 304 is provided on the fixed ring 301. The drive mechanism 304 includes a displacement platform 3041 and a rotation mechanism 3042 disposed on the displacement platform 3041. A rotating rod 3043 is connected to the rotating shaft of the rotation mechanism 3042. One end of the rotating rod 3043 is fixedly connected to the rotation mechanism 3042, and the other end is hinged to the support rod 302. The reciprocating rotation of the rotation mechanism 3042 drives the rotating rod 3043 to rotate, thereby causing the support rod 302 to move along a fixed trajectory under the constraint of the arc-shaped through hole 307, so that the support rod 302 moves as shown in the image. Figure 4a , 4b The support rod 302 reciprocates to the indicated position. To limit the movement of the support rod 302 and facilitate positioning when it rotates to the working position, a limiting hole 306 is provided on the fixing ring 301 near the arc-shaped through hole 307. The limiting block 306 has a curved surface facing the arc-shaped through hole 307, allowing the support rod 302 to rotate against the curved surface of the arc-shaped through hole 307, thus making the movement of the support rod 302 more stable. When the support rod 302 moves to... Figure 4b As shown, the side of the support rod 302 abuts against the flat portion of the limiting block 306 and remains stable.

[0024] The support rod 302 is configured as a load-bearing structure for the movable rod assembly 303, which is a pair of movable rods hinged to the other end of the support rod 302 away from the arc-shaped through hole 307. The movable rod assembly 303 includes a first movable rod 3031 and a second movable rod 3032. One end of the first movable rod 3031 and the second movable rod 3032 are simultaneously hinged to the support rod 302, and the other ends of the first movable rod 3031 and the second movable rod 3032 are simultaneously slidably disposed in the inner groove of the fixing ring 301. To automate the driving of the movable rod assembly 303, a strip hole 3021 is opened in the middle of the support rod 302. A pushing mechanism 305 is provided near one end of the support rod 302 close to the arc-shaped through hole 307. The pushing mechanism 305 includes a rotating table 3051 and a telescopic mechanism 3052 that drives the telescopic rod 3053 through the rotating table 3051. The telescopic mechanism 3052 is used to control the extension and retraction of the telescopic rod 3053. At the same time, one end of the telescopic rod 3053 close to the arc-shaped through hole 307 passes through the strip hole 3021 and is connected to a locking member 308.

[0025] like Figure 5a , 5bAs shown in Figure 7, in the initial state, the first movable rod 3031 and the second movable rod 3032 are located at the bottom of the support rod 302, and the first side of the first movable rod 3031 and the first side of the second movable rod 3032 are close to each other. The locking member 308 is located between the first side of the first movable rod 3031 and the first side of the second movable rod 3032. When the support rod 302 reaches... Figure 4b After positioning, the telescopic mechanism 3052 drives the telescopic rod 3053 to extend. The telescopic rod 3053 pushes the locking member 308 from the end of the support rod 302 near the arc-shaped through hole 307 to the end away from the arc-shaped through hole 307 along the direction of the strip hole 3021. Because the first side of the first movable rod 3031 and the first side of the second movable rod 3032 of the locking member 308 are hinged together at the end of the support rod 302 away from the arc-shaped through hole 307, the telescopic rod 3053 pushes the locking member... When component 308 is activated, the first movable rod 3031 and the second movable rod 3032 will unfold, meaning that the first side of the first movable rod 3031 and the first side of the second movable rod 3032 will move away from each other. When the telescopic rod 3053 continues to push the locking component 308, the second side of the first movable rod 3031 and the second side of the second movable rod 3032 will move closer to each other and fit together. When the telescopic rod 3053 continues to push the locking component 308, the opening of the locking component 308 can finally engage the hinged parts of the first movable rod 3031 and the second movable rod 3032 to achieve locking.

[0026] like Figure 6 As shown, a foldable and unfoldable platform 400 is provided between the first side of the first movable rod 3031 and the first side of the second movable rod 3032. The platform 400 has a foldable structure. When the first side of the first movable rod 3031 and the first side of the second movable rod 3032 are located at... Figure 5a In the current state, the platform 400 is retracted, and when the first side of the first movable rod 3031 and the first side of the second movable rod 3032 are located... Figure 5b In this state, the stage 400 is unfolded to form a roughly planar surface to support the object 500 being measured.

[0027] like Figure 7 As shown, to ensure sufficient support and stability for the first movable rod 3031 and the second movable rod 3032 within the inner side of the fixed ring 301, a groove 3011 is formed in the fixed ring 301. The ends of the first movable rod 3031 and the second movable rod 3032 away from the hinge portion are slidably disposed within the groove 3011. Simultaneously, to satisfy the condition that when the first side of the first movable rod 3031 and the first side of the second movable rod 3032 are located... Figure 5aIn the current state, the first side of the first movable rod 3031 and the first side of the second movable rod 3032 remain close to each other. An elastic rope 3034 is provided at the ends of the first movable rod 3031 and the second movable rod 3032 away from the hinge portion for connection. Specifically, a limiting groove is also provided inside the groove 3011 on the side near the cleaning tank 201. The first movable rod 3031 and the second movable rod 3032 are respectively provided with limiting blocks 3033 corresponding to the limiting grooves. The elastic rope 3034 connects the limiting blocks 3033 of the first movable rod 3031 and the second movable rod 3032, and the elastic rope 3034 is constrained within the limiting groove to prevent it from falling off. (See reference...) Figure 5a When the first side of the first movable rod 3031 and the first side of the second movable rod 3032 approach each other, the tension of the elastic rope 3034 restricts the first movable rod 3031 and the second movable rod 3032 to the bottom of the support rod 302. (See reference...) Figure 5b When the second side of the first movable rod 3031 and the second side of the second movable rod 3032 approach and fit together, the elastic rope 3034 is arranged around the limiting groove in the groove 3011. The tension of the first movable rod 3031 and the second movable rod 3032 is at its maximum, which facilitates the telescopic rod 3053 to continue to drive the locking member 308 to retract. After the locking member 308 unlocks the first movable rod 3031 and the second movable rod 3032, the first movable rod 3031 and the second movable rod 3032 return to their original positions. Figure 5a The first side of the first movable rod 3031 and the first side of the second movable rod 3032 are close to each other, and the first movable rod 3031 and the second movable rod 3032 are restricted to the bottom of the support rod 302.

[0028] The present invention provides a method for using the aforementioned device to detect pesticide residues on the surface of jujubes: First, jujubes are fed into the feed inlet. The cover assembly forms a platform 500 at the bottom of the detection unit to support the jujubes. The detection unit performs spectral detection on the jujube products. The laser source 105 irradiates the jujube skin, and the spectral camera 104 collects the reflected light from the jujube skin. The device's calculation system selects a certain range of photometric values ​​of the reflected light according to the system settings, substitutes them into the PLS model to calculate the residue concentration, and obtains the pesticide residue information on the skin.

[0029] Then, the stage 500 at the bottom of the detection unit is removed from the cover assembly. The jujubes on the stage fall into the cleaning unit and are cleaned by ultrasonic waves, which dissolves the residual pesticides on the surface of the jujubes into the solution. After a preset cleaning time, the test solution is obtained. The test solution is detected by the solution detector 206 to detect the pesticide components and concentration in the solution and obtain the pesticide information in the solution.

[0030] Finally, the aforementioned information on pesticide residues on the skin and in solution was calculated to obtain an average value, thus yielding more accurate information on pesticide residues on the skin of jujubes.

[0031] All of the above-mentioned optional technical solutions can be combined in any way to form optional embodiments of the present invention, and will not be described in detail here.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting pesticide residues on the surface of jujubes, characterized in that, include: A detection unit, wherein the detection unit is used to detect pesticide residues on the surface of the test object by means of reflectance spectroscopy; A cleaning unit, wherein the cleaning unit is used to dissolve pesticides in a solution by ultrasonic cleaning; A support unit is disposed between the detection unit and the cleaning unit, and operates in response to the actions of the detection unit and the cleaning unit; The carrier unit includes: A fixed ring is disposed between the detection unit and the cleaning unit. A support rod and a movable rod assembly hinged to the support rod are movably connected to the fixed ring. The movable rod assembly includes a first movable rod and a second movable rod. A foldable platform is disposed between the first side of the first movable rod and the first side of the second movable rod. The support rod includes a strip-shaped hole opened in the middle of the support rod; A telescopic rod, which passes through the slot and is connected to a locking structure, the locking structure abutting against the first side of the first movable rod and the first side of the second movable rod; The slotted hole is configured to define the movement path of the telescopic rod.

2. The pesticide residue detection device on the surface of jujube as described in claim 1, characterized in that, The detection unit includes a laser source and a spectral camera. The laser source is used to emit irradiation light onto the surface of the object being tested, and the spectral camera is used to collect the reflected light formed on the surface of the object being tested by the irradiation light.

3. The pesticide residue detection device on the surface of jujube as described in claim 1, characterized in that, The cleaning unit includes a cleaning tank and a transducer array disposed in the cleaning tank. The cleaning tank is spherical, and the ultrasonic array is distributed on the spherical surface of the cleaning tank.

4. The pesticide residue detection device on the surface of jujube as described in claim 1, characterized in that, The supporting unit also includes: A drive mechanism is used to drive the support rod to move; A driving mechanism is used to drive the movable lever assembly; The pushing mechanism includes a rotating platform and a telescopic mechanism that is dynamically driven by the rotating platform, and the telescopic rod is disposed in the telescopic mechanism.

5. The pesticide residue detection device on the surface of jujube as described in claim 1, characterized in that, The fixing ring also includes: An arc-shaped through hole is provided, which is not coaxial with the fixing ring, and is configured to limit the movement path of the support rod.

6. The pesticide residue detection device on the surface of jujube as described in claim 1, characterized in that, The support rod is positioned on the fixing ring, and the fixing ring is provided with an arc-shaped through hole corresponding to the support rod. The arc-shaped through hole is configured as the moving path of the support rod.

7. The pesticide residue detection device on the surface of jujube as described in claim 1, characterized in that, The fixing ring also includes: The groove located on the inner side of the fixed ring is used to limit the position of one end of the first and second movable rods away from the hinged portion of the first and second movable rods with the support rod.

8. The pesticide residue detection device on the surface of jujube as described in claim 7, characterized in that, The groove includes: Limiting groove; Elastic ropes are provided at the ends of the first movable rod and the second movable rod away from the hinge portion; The elastic cord is configured to reset the first movable rod and the second movable rod.

9. The pesticide residue detection device on the surface of jujube as described in claim 3, characterized in that, The transmitting end of each ultrasonic transducer in the transducer array is pointed towards the center of the sphere in the cleaning tank.

10. The pesticide residue detection device on the surface of jujube as described in claim 1, characterized in that, The cleaning unit includes: A cleaning tank having a water outlet pipe connected to a solution detector for collecting and detecting pesticide information in the solution discharged through the water outlet pipe.

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