A device for detecting heavy metal components in food

Abstract

The present invention relates to a food heavy metal component detection device in the field of food detection equipment. Through a rotating rod equipped with a blade and a lifting ring connected to the rotating rod, when crushing food, the blade rotates up and down to reciprocate and fully crush the food sample in the detection tube, which is convenient for mixing food juice and solvent, and improves the accuracy of subsequent detection; in addition, through a filter plate arranged above an electrode rod and a sealing disk driven by magnetism for sealing the filter plate, after the crushing is completed, the filter plate is opened to allow the sample solution to flow into the cavity where the electrode rod is located, so as to achieve filtering and rapid transfer of the sample solution, and finally the electrode rod is used to detect the metal concentration in the sample solution and the result is displayed on a display screen outside a lower cover, so as to automatically complete the whole process of heavy metal detection.

Description

Technical Field

[0001] The invention relates to a detection device, in particular to a food heavy metal component detection device applied in the field of food detection equipment. Background Art

[0002] Food heavy metal testing is an important part of ensuring food safety. During the testing process, commonly used techniques include atomic absorption spectroscopy (AAS), inductively coupled plasma mass spectrometry (ICP-MS) and X-ray fluorescence spectroscopy (XRF). These methods can accurately measure the content of heavy metal elements such as lead, mercury, and cadmium in food. Even if the concentration of these elements in food is extremely low, they can be accurately detected. In addition, in order to ensure the accuracy of the test results, strict sample pretreatment steps are usually adopted, such as digestion and dilution, to eliminate the influence of other ingredients in food on the test results. At the same time, standardized operating procedures and quality control measures are used in the testing process to ensure the reliability and repeatability of the test results.

[0003] Existing methods for detecting heavy metals in food require samples to be crushed, filtered, stirred, mixed, transferred, and tested and recorded, relying on multiple manual steps and making the operation cumbersome. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing food heavy metal detection process requires manual operations such as crushing, filtering, stirring, mixing, transferring and detection recording in sequence, which is cumbersome to operate.

[0005] In order to solve the above problems, the present invention provides a device for detecting heavy metal components in food, comprising a detection cylinder, an upper cover detachably connected to the upper end of the detection cylinder, a fixed cylinder extending into the detection cylinder is fixedly connected to the upper cover, a rotating rod extending below the fixed cylinder is provided in the fixed cylinder, a blade is fixedly connected to the lower end of the rotating rod, a plug-in shaft slidably engaged with the rotating rod is plugged into the rotating rod, the upper end of the plug-in shaft extends into the upper cover and is connected to a driving motor through a coupling, and the driving motor drives the rotating rod and the blade connected thereto to rotate through the plug-in shaft;

[0006] The upper end of the rotating rod is rotatably connected with a lifting ring which is slidably nested in the fixed cylinder. The lifting ring is threadedly connected with a vertical screw installed in the inner wall of the fixed cylinder. The vertical screw extends into the upper cover and is connected to the plug-in shaft through a reduction gear set for transmission. The plug-in shaft drives the vertical screw to rotate through the reduction gear set. The vertical screw drives the lifting ring to move up and down in the fixed cylinder. The lifting ring drives the rotating rod and the blade installed thereon to move up and down.

[0007] The lower end of the detection cylinder is detachably connected to a lower cover, the upper end of the lower cover is fixedly connected to a support frame, the support frame is fixedly connected to a filter plate, a sealing disk is abutted under the filter plate, the sealing disk is fixedly connected to a lifting cylinder, an electromagnetic cylinder slidably connected to the lifting cylinder is nested, a first magnetic ring is installed in the lifting cylinder, an electromagnetic coil matching the first magnetic ring is installed in the electromagnetic cylinder, a limit spring abutting against the electromagnetic cylinder is nested in the lifting cylinder, and the electromagnetic cylinder is fixedly connected to the support frame through a cross bar; the lower cover is fixedly connected to an electrode rod extending into the detection cylinder, the electrode rod is connected to an electrode detector installed in the lower cover, and the electrode detector is connected to a display screen installed on the side wall of the lower cover.

[0008] In the above-mentioned food heavy metal component detection device, the food sample is fully crushed and mixed and the sample solution is quickly filtered and detected through the up and down rotating blade and the filter plate abutting against the blocking plate, thereby simplifying the operation.

[0009] As a further improvement of the present invention, a floating plate is slidably sleeved on the rotating rod above the blade, a prismatic hole matching the rotating rod is provided at the center of the floating plate, and a plurality of stirring plates are installed on the lower end surface of the floating plate.

[0010] As a further improvement of the present invention, a second magnetic ring cooperating with the electromagnetic coil is provided in the floating plate, and the second magnetic ring moves downward when magnetically attracted by the electromagnetic coil.

[0011] As a further improvement of the present invention, the detection cylinder is a hollow cylinder with openings at both ends, the upper cover and the lower cover are fixedly connected to the detection cylinder by threaded connection, and the detection cylinder is made of transparent plastic material.

[0012] As a further improvement of the present invention, the plug-in shaft is a prismatic rod with a regular polygonal cross-section, the rotating rod is provided with a prismatic groove matching the plug-in shaft, a rotating ring is provided at the upper end of the rotating rod, and the lifting ring is provided with an annular groove on the inner wall for the rotating ring to rotate.

[0013] As a further improvement of the present invention, a Hall sensor is provided in the drive motor for monitoring the number of rotations and rotation position of the output shaft of the drive motor, a switch button for turning on the drive motor is nested at the upper end of the upper cover, the electromagnetic coil is electrically connected to the electromagnetic driver, and the drive motor, Hall sensor, electrode detector, electromagnetic driver, display screen and switch button are all electrically connected to the controller.

[0014] As a further improvement of the present invention, a limiting ring is provided on the rotating rod between the blade and the floating plate, and the limiting ring abuts against the floating plate.

[0015] As a further improvement of the present invention, the cross-section of the stirring plate is a parallelogram, a nesting groove for the stirring plate to slide is provided in the floating plate, a sliding column is fixedly connected to the upper end of the stirring plate, a guide groove for the sliding column to slide is provided in the nesting groove, and the guide groove is an inclined groove and is parallel to the side of the stirring plate.

[0016] To summarize, the present invention uses a rotating rod equipped with a blade and a lifting ring connected to the rotating rod, so that when the food is crushed, the blade rotates up and down to reciprocate and fully crush the food sample in the detection tube, which is convenient for mixing of food juice and solvent, and improves the accuracy of subsequent detection; in addition, through the filter plate arranged above the electrode rod and the sealing disk driven by magnetism for sealing the filter plate, after the crushing is completed, the filter plate is opened to allow the sample solution to flow into the cavity where the electrode rod is located, thereby realizing the filtration and rapid transfer of the sample solution, and finally the electrode rod is used to detect the metal concentration in the sample solution and the result is displayed on the display screen outside the lower cover, thereby automatically completing the whole process of heavy metal detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of this application;

[0018] Figure 2 It is a cross-sectional structural schematic diagram of this application;

[0019] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 4 This is a schematic diagram of the up and down rotation state of the blade in this application;

[0021] Figure 5 This is an exploded view of the assembly of the rotating rod in this application;

[0022] Figure 6 for Figure 2 A schematic diagram of the enlarged structure at B in the middle;

[0023] Figure 7 This is a schematic diagram of the assembly of the filter plate and the lower cover in this application;

[0024] Figure 8 It is a schematic diagram of the cross-sectional structure of the lower cover in this application;

[0025] Fig. 9 This is a schematic diagram of the assembly of the floating plate and the upper cover in this application;

[0026] Fig.10 This is a schematic diagram of the assembly of the floating board and the rotating rod in this application;

[0027] Fig.11 It is a schematic diagram of the cross-sectional structure of the floating plate in this application;

[0028] Fig.12 Schematic diagram of the three-dimensional structure of the stirring plate in this application;

[0029] Fig.13This is a schematic diagram of the state in which the floating plate presses down to extrude the sample solution in this application.

[0030] Description of the numbers in the figure:

[0031] 1. Detection cylinder; 2. Upper cover; 3. Lower cover; 4. Fixed cylinder; 5. Rotating rod; 501. Rotating ring; 502. Limiting ring; 6. Blade; 7. Plug-in shaft; 8. Driving motor; 9. Lifting ring; 10. Vertical screw rod; 11. Reduction gear set; 12. Support frame; 13. Filter plate; 14. Sealing disk; 15. Lifting cylinder; 16. Electromagnetic cylinder; 17. Limiting spring; 18. Electromagnetic coil; 19. First magnetic ring; 20. Electrode rod; 21. Electrode detector; 22. Electromagnetic driver; 23. Display screen; 24. Controller; 25. Switch button; 26. Floating plate; 2601. Prismatic hole; 2602. Nesting groove; 2603. Guide groove; 27. Stirring plate; 2701. Sliding column; 28. Second magnetic ring; 29. ​​Infrared distance sensor. DETAILED DESCRIPTION

[0032] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0033] The first implementation method:

[0034] Figure 1-8 A device for detecting heavy metal components in food is shown, comprising a detection cylinder 1, the upper end of which is detachably connected to an upper cover 2, the upper cover 2 is fixedly connected to a fixed cylinder 4 extending into the detection cylinder 1, a rotating rod 5 extending to the lower part of the fixed cylinder 4 is arranged in the fixed cylinder 4, a blade 6 is fixedly connected to the lower end of the rotating rod 5, a plug-in shaft 7 slidably engaged with the rotating rod 5 is plugged into the rotating rod 5, the upper end of the plug-in shaft 7 extends into the upper cover 2 and is connected to a driving motor 8 through a coupling, and the driving motor 8 drives the rotating rod 5 and the blade 6 connected thereto to rotate through the plug-in shaft 7;

[0035] The upper end of the rotating rod 5 is rotatably connected with a lifting ring 9 which is slidably nested in the fixed cylinder 4. The lifting ring 9 is threadedly connected with a vertical screw 10 installed in the inner wall of the fixed cylinder 4. The vertical screw 10 extends into the upper cover 2 and is connected to the plug-in shaft 7 through a reduction gear set 11. The plug-in shaft 7 drives the vertical screw 10 to rotate through the reduction gear set 11. The vertical screw 10 drives the lifting ring 9 to move up and down in the fixed cylinder 4. The lifting ring 9 drives the rotating rod 5 and the blade 6 installed thereon to move up and down;

[0036] The lower end of the detection cylinder 1 is detachably connected to a lower cover 3, the upper end of the lower cover 3 is fixedly connected to a support frame 12, the support frame 12 is fixedly connected to a filter plate 13, a blocking disk 14 is abutted below the filter plate 13, the blocking disk 14 is fixedly connected to a lifting cylinder 15, an electromagnetic cylinder 16 slidably connected thereto is nested in the lifting cylinder 15, a first magnetic ring 19 is installed in the lifting cylinder 15, an electromagnetic coil 18 cooperating with the first magnetic ring 19 is installed in the electromagnetic cylinder 16, a limit spring 17 abutting against the electromagnetic cylinder 16 is nested in the lifting cylinder 15, and the electromagnetic cylinder 16 is fixedly connected to the support frame 12 through a cross bar; the lower cover 3 is fixedly connected to an electrode rod 20 extending into the detection cylinder 1, the electrode rod 20 is connected to an electrode detector 21 installed in the lower cover 3, and the electrode detector 21 is connected to a display screen 23 installed on the side wall of the lower cover 3.

[0037] For details, please refer to Figure 2 , Figure 4 and Figure 6 , when conducting heavy metal testing on food, the following steps are included:

[0038] Step 1: Add materials; open the upper cover 2, put the food sample and solvent into the detection cylinder 1, and then close the upper cover 2;

[0039] Step 2: crushing; start the driving motor 8, the driving motor 8 drives the rotating rod 5 to rotate through the plug-in shaft 7, the rotating rod 5 drives the blade 6 to rotate, and the food sample is crushed. At the same time, the plug-in shaft 7 drives the vertical screw 10 to rotate through the reduction gear set 11, the vertical screw 10 drives the lifting ring 9 to move up and down, the lifting ring 9 drives the rotating rod 5 to move up and down, the rotating rod 5 drives the blade 6 to move up and down, so that the blade 6 rotates up and down in the detection tube 1;

[0040] Specifically, the blade 6 rotates up and down to fully break up the sample, ensuring that the sample juice and the solvent are fully mixed, thereby improving the accuracy of the detection;

[0041] Step three, filtration transfer; after the crushing is completed, the electromagnetic coil 18 is started, and the electromagnetic coil 18 magnetically adsorbs the first magnetic ring 19, and the first magnetic ring 19 drives the lifting cylinder 15 to move downward, and the lifting cylinder 15 drives the sealing disk 14 to separate from the filter plate 13, so that the sample solution passes through the filter holes of the filter plate 13 into the cavity below;

[0042] Step 4, detection and display; start the electrode detector 21, the electrode detector 21 detects the sample solution through the electrode rod 20, and detects the various activities of ions in the sample solution through the ion selective electrode, so as to obtain the actual concentration of heavy metals in the food.

[0043] Compared with the traditional food heavy metal detection device, the present invention uses a rotating rod 5 equipped with a blade 6 and a lifting ring 9 connected to the rotating rod 5. When crushing food, the blade 6 rotates up and down to reciprocate and fully crush the food sample in the detection tube 1, which is convenient for mixing food juice and solvent, and improves the accuracy of detection; in addition, through the filter plate 13 arranged above the electrode rod 20 and the sealing disk 14 driven by magnetism for sealing the filter plate 13, after the crushing is completed, the filter plate 13 is opened to allow the sample solution to flow into the cavity where the electrode rod 20 is located, so as to achieve filtering and rapid transfer of the sample solution, and the operation is simple. Finally, the electrode rod 20 is used to detect the metal concentration in the sample solution and the result is displayed on the display screen 23 outside the lower cover 3, and the operation is quick; in addition, the detachable upper cover 2 and lower cover 3 allow the detection tube 1 to clean the residue and wash and dry after the detection is completed.

[0044] See also Figure 2 The detection cylinder 1 is a hollow cylinder with openings at both ends. The upper cover 2 and the lower cover 3 are fixedly connected to the detection cylinder 1 by threaded connection. The detection cylinder 1 is made of transparent plastic material.

[0045] Specifically, it is convenient to observe the crushing and detection process of the food in the detection cylinder 1, realize visual operation, reduce the difficulty of operation, and facilitate the quick disassembly of the upper cover 2 and the lower cover 3. The blade assembly is installed on the upper cover 2 and the detection assembly is installed on the lower cover 3, which is easy to clean and dry.

[0046] See also Figure 4 and Figure 5 The plug-in shaft 7 is a prismatic rod with a regular polygonal cross section. The rotating rod 5 is provided with a prismatic groove that cooperates with the plug-in shaft 7. A rotating ring 501 is provided at the upper end of the rotating rod 5. The lifting ring 9 has an annular groove on the inner wall for the rotating ring 501 to rotate.

[0047] Specifically, the plug-in shaft 7 is inserted into the rotating rod 5 and slidably abuts against the inner wall of the prism groove, thereby realizing the rotation transmission of the rotating rod 5 during the upward and downward movement.

[0048] See also Figure 2 , Figure 3 , Figure 6 and Figure 8 A Hall sensor for monitoring the number of rotations and the rotation position of the output shaft of the drive motor 8 is provided in the drive motor 8. A switch button 25 for turning on the drive motor 8 is nested at the upper end of the upper cover 2. The electromagnetic coil 18 is electrically connected to the electromagnetic driver 22. The drive motor 8, the Hall sensor, the electrode detector 21, the electromagnetic driver 22, the display screen 23 and the switch button 25 are all electrically connected to the controller 24.

[0049] Specifically, it is convenient to realize automatic crushing, filtering transfer and detection display of food samples, and realize automatic detection.

[0050] Second implementation method:

[0051] Figure 9-13 A device for detecting heavy metal components in food is shown. Based on the first embodiment, a rotating rod 5 is located above a blade 6 and is slidably sleeved with a floating plate 26. A prismatic hole 2601 cooperating with the rotating rod 5 is opened at the center of the floating plate 26, and a plurality of stirring plates 27 are installed on the lower end surface of the floating plate 26.

[0052] Specifically, when the blade 6 crushes the food, the floating plate 26 always floats above the liquid surface of the sample solution, so as to prevent the sample solution from splashing and adhering to the side wall of the detection tube 1 under the action of the blade 6, thereby reducing the waste of sample juice, improving the detection accuracy and facilitating subsequent cleaning; in addition, when the rotating rod 5 rotates, the floating plate 26 is driven to rotate, and the floating plate 26 drives the stirring plate 27 to rotate, so as to synchronously stir the sample solution in the crushing process, so that the solvent and the sample juice are fully contacted and mixed, thereby improving the extraction rate of the juice and making the distribution of the components in the sample solution more uniform, thereby further improving the accuracy of the detection.

[0053] See also Fig.10 A limiting ring 502 is provided on the rotating rod 5 between the blade 6 and the floating plate 26 , and the limiting ring 502 abuts against the floating plate 26 .

[0054] Specifically, it is to prevent the floating plate 26 from colliding with the blade 6 and interfering with it to damage the blade 6 .

[0055] See also Fig.10 A second magnetic ring 28 cooperating with the electromagnetic coil 18 is disposed in the floating plate 26 , and the second magnetic ring 28 moves downward when magnetically attracted by the electromagnetic coil 18 .

[0056] Specifically, after the electromagnetic coil 18 magnetically attracts the first magnetic ring 19, the sealing disk 14 is separated from the filter plate 13, and the sample solution above the filter plate 13 gradually decreases. The food sample residue accumulates in the filter plate 13, and the floating plate 26 abuts against the sample residue. The electromagnetic coil 18 magnetically attracts the second magnetic ring 28, and the second magnetic ring 28 drives the floating plate 26 to move downward. The floating plate 26 and the filter plate 13 cooperate to squeeze the sample residue, so that the solution remaining in the sample residue is squeezed out, thereby further increasing the extraction amount of the sample solution and improving the detection accuracy.

[0057] See also Fig.11 and Fig.12 The cross section of the stirring plate 27 is a parallelogram, a nesting groove 2602 for the stirring plate 27 to slide is provided in the floating plate 26, a sliding column 2701 is fixedly connected to the upper end of the stirring plate 27, a guide groove 2603 for the sliding column 2701 to slide is provided in the nesting groove 2602, and the guide groove 2603 is an inclined groove and parallel to the side of the stirring plate 27.

[0058] Specifically, when the stirring plate 27 rotates with the floating plate 26, it is subjected to the centrifugal force, and the stirring plate 27 extends out of the nesting groove 2602, thereby increasing the stirring area and further improving the stirring effect; when the floating plate 26 squeezes the food residue, the stirring plate 27 is received in the nesting groove 2602, so that the lower end surface of the floating plate 26 remains flat, thereby improving the effect of squeezing out the liquid.

[0059] See also Fig.13 An infrared distance sensor 29 arranged opposite to the floating board 26 is fixedly connected to the upper cover 2 , and the infrared distance sensor 29 monitors the position of the floating board 26 .

[0060] Specifically, during crushing, when the position of the floating plate 26 no longer changes, it means that the crushing has been completed and the volume of the mixed liquid no longer changes. At this time, the controller 24 can turn on the electromagnetic coil 18, open the sealing disk 14 under the filter plate 13, and perform filtering and transfer operations. When the position of the floating plate 26 does not change again, it means that most of the sample solution has been transferred to the cavity below the filter plate 13. At this time, the controller 24 increases the current of the electromagnetic coil 18, so that the floating plate 26 is squeezed downward to squeeze out the liquid, detect the squeezing depth, improve the squeezing effect, and at the same time, avoid overloading the electromagnetic coil 18.

[0061] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A device for detecting heavy metal components in food, characterized in that: The detection cylinder (1) comprises a detection cylinder (1), wherein the upper end of the detection cylinder (1) is detachably connected to an upper cover (2), the upper cover (2) is fixedly connected to a fixed cylinder (4) extending into the detection cylinder (1), a rotating rod (5) extending to the lower part thereof is provided in the fixed cylinder (4), a blade (6) is fixedly connected to the lower end of the rotating rod (5), the rotating rod (5) is plugged with a plug-in shaft (7) slidably engaged therewith, the upper end of the plug-in shaft (7) extends into the upper cover (2) and is connected to a driving motor (8) via a coupling, and the driving motor (8) drives the rotating rod (5) and the blade (6) connected thereto to rotate via the plug-in shaft (7); The detection cylinder (1) is a hollow cylinder with openings at both ends. The upper cover (2) and the lower cover (3) are fixedly connected to the detection cylinder (1) by means of threaded connection. The detection cylinder (1) is made of a transparent plastic material. The upper end of the rotating rod (5) is rotatably connected to a lifting ring (9) which is slidably nested in the fixed cylinder (4); the lifting ring (9) is threadedly connected to a vertical screw rod (10) installed in the inner wall of the fixed cylinder (4); the vertical screw rod (10) extends into the upper cover (2) and is connected to the plug-in shaft (7) through a reduction gear set (11) for transmission; the plug-in shaft (7) drives the vertical screw rod (10) to rotate through the reduction gear set (11); the vertical screw rod (10) drives the lifting ring (9) to move up and down in the fixed cylinder (4); and the lifting ring (9) drives the rotating rod (5) and the blade (6) installed thereon to move up and down; The rotating rod (5) is located above the blade (6) and is slidably sleeved with a floating plate (26); a prismatic hole (2601) cooperating with the rotating rod (5) is provided at the center of the floating plate (26); a plurality of stirring plates (27) are installed on the lower end surface of the floating plate (26); a second magnetic ring (28) cooperating with the electromagnetic coil (18) is provided inside the floating plate (26); the second magnetic ring (28) moves downward when magnetically attracted by the electromagnetic coil (18); the plug-in shaft (7) is a prismatic rod with a regular polygonal cross section; the rotating rod (5) is provided with a prismatic groove cooperating with the plug-in shaft (7); a rotating ring (501) is provided at the upper end of the rotating rod (5); and the lifting ring (9) is provided with an annular groove on the inner wall for the rotating ring (501) to rotate; The lower end of the detection cylinder (1) is detachably connected to a lower cover (3), the upper end of the lower cover (3) is fixedly connected to a support frame (12), the support frame (12) is fixedly connected to a filter plate (13), a blocking disk (14) is abutted below the filter plate (13), the blocking disk (14) is fixedly connected to a lifting cylinder (15), an electromagnetic cylinder (16) slidably connected to the lifting cylinder (15) is nested in the lifting cylinder (15), a first magnetic ring (19) is installed in the lifting cylinder (15), and a magnetic ring (19) is installed in the electromagnetic cylinder (16) The electromagnetic coil (18) cooperates with the ring (19), a limit spring (17) abutting against the electromagnetic cylinder (16) is nested in the lifting cylinder (15), and the electromagnetic cylinder (16) is fixedly connected to the support frame (12) via a cross bar; the lower cover (3) is fixedly connected to an electrode rod (20) extending into the detection cylinder (1), the electrode rod (20) is connected to an electrode detector (21) installed in the lower cover (3), and the electrode detector (21) is connected to a display screen (23) installed on the side wall of the lower cover (3); The drive motor (8) is provided with a Hall sensor for monitoring the number of rotations and the rotation position of the output shaft of the drive motor (8); a switch button (25) for turning on the drive motor (8) is nested at the upper end of the upper cover (2); the electromagnetic coil (18) is electrically connected to the electromagnetic driver (22); the drive motor (8), the Hall sensor, the electrode detector (21), the electromagnetic driver (22), the display screen (23) and the switch button (25) are all electrically connected to the controller (24).

2. A food heavy metal component detection device according to claim 1, characterized in that: The rotating rod (5) is provided with a limiting ring (502) between the blade (6) and the floating plate (26), and the limiting ring (502) abuts against the floating plate (26).

3. A food heavy metal component detection device according to claim 1, characterized in that: The stirring plate (27) has a parallelogram cross section, a nesting groove (2602) for the stirring plate (27) to slide is provided in the floating plate (26), a sliding column (2701) is fixedly connected to the upper end of the stirring plate (27), a guide groove (2603) for the sliding column (2701) to slide is provided in the nesting groove (2602), and the guide groove (2603) is an inclined groove and is parallel to the side of the stirring plate (27).

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