Dipping device for heavy metal detection of fast food packaging box

Abstract

The utility model belongs to the technical field of heavy metal extraction, and particularly relates to a dipping device for fast food packaging box heavy metal detection, which comprises a device body, a collection kettle is arranged in the device body, a dipping kettle is arranged at the top of the collection kettle, and the collection kettle is connected with the dipping kettle through a dipping liquid steam conveying pipe. A steeping liquid steam conveying pipe is arranged at one end of the steeping kettle, a steam conveying valve is arranged on the steeping liquid steam conveying pipe, a steam return pipe is arranged on the steeping kettle, the other end of the steam return pipe is communicated with the collecting kettle, a steam return valve is arranged on the steam return pipe, and the top of the steeping kettle is communicated with the condenser. A steam conveying pipe is arranged, heated impregnation liquid is conveyed to an impregnation kettle, a sample to be detected is placed in the impregnation kettle, the impregnation liquid makes contact with the sample to be detected, and heavy metal is impregnated into the impregnation liquid; by arranging the vibration motor, the screening barrel can be vibrated, the impregnation efficiency is improved, the steam return pipe is arranged at the bottom of the impregnation kettle, and impregnation liquid flows back into the collection kettle under the action of gravity.

Description

Technical Field

[0001] This application belongs to the field of heavy metal extraction technology, specifically an immersion device for detecting heavy metals in fast food packaging boxes. Background Technology

[0002] In recent years, food safety has become a global focus. People are not only concerned about the safety of food, but also about the safety of food packaging. The concept of "green packaging" has gained widespread acceptance.

[0003] It is well known that heavy metals are extremely harmful to the human body: for example, lead can cause damage to the nervous system, including ADHD and growth retardation in children, as well as dementia in the elderly; mercury can affect neurotransmission in the brain, potentially leading to symptoms such as nerve paralysis and memory loss; cadmium can cause kidney failure, and mercury is mostly deposited in brain tissue, but can also cause damage to the liver and kidneys; nickel is a carcinogen, and the incidence of certain types of cancer can be increased due to industrial zinc poisoning.

[0004] However, existing food plastic packaging materials contain heavy metals, which contaminate the food itself during use and thus enter the human body, harming human health. There are generally two methods for detecting heavy metals in packaging materials: direct detection and detection after extraction.

[0005] For example, patent CN202420201705.9 describes a device for detecting harmful heavy metals in food tableware, which uses a direct detection method. When detecting harmful heavy metals in food tableware, the protective door at the bottom of the detection chamber must first be opened. Then, the sample to be tested is placed at the bottom of the detection chamber. After placement, the valve rod is turned to open the valve inside the discharge pipe. When the valve is opened, the mixed reaction reagent in the upper layer of the detection chamber will flow into the sample through the discharge pipe. After discharging an appropriate amount, the valve is closed. Then, the sample is left to stand for a period of time, and the reaction between the reagent and the sample to be tested is observed. If an obvious oxidation-reduction reaction and discoloration occur on the sample surface, it indicates that the harmful heavy metal indicated by the tested reaction reagent exceeds the standard. To test different harmful heavy metals, only the appropriate reaction solvent needs to be selected when preparing the reagent. However, existing disposable tableware, such as instant noodle boxes, has an inner lining. When medicine is dripped onto the box, the inner lining prevents the medicine from penetrating the packaging, thus the test results may not be accurate. Patent CN202321840227.8, a food plastic packaging testing soaking device, uses an extraction-before-testing method. During use, when a second motor is activated, it rotates a connecting disc, which in turn rotates a stirring column. The stirring column mixes the soaking solution in the solution tank, ensuring the substances in the food plastic packaging bag are evenly mixed before sampling and testing. This ensures the accuracy of the food plastic packaging bag test results, increases the accuracy of the device, and thus guarantees the testing effect. During soaking, the packaging box is continuously immersed in the solution. As the soaking time increases, some heavy metals leach into the solution. As the concentration of heavy metals in the solution increases, the rate at which heavy metals leach into the solution slows down, which may lead to errors in the final heavy metal concentration reading of the tested sample.

[0006] This application provides a pretreatment device for food boxes before testing, specifically an immersion device for heavy metal detection in fast food packaging boxes. Summary of the Invention

[0007] To address the problems of the prior art, this application provides an immersion device for detecting heavy metals in fast food packaging boxes, which is achieved through the following solution:

[0008] An impregnation device for detecting heavy metals in fast food packaging boxes includes a device body, a collection vessel inside the device body, an impregnation vessel on top of the collection vessel, the collection vessel and the impregnation vessel being connected by an impregnation liquid steam transport pipe, a steam transport valve being provided on the impregnation liquid steam transport pipe, a steam return pipe being provided on the impregnation vessel, the other end of the steam return pipe being connected to the collection vessel, a steam return valve being provided on the steam return pipe, and the top of the impregnation vessel being connected to a condenser.

[0009] A heated impregnation solution is transported to the impregnation tank via a steam transport pipe. Food packaging boxes are placed inside the impregnation tank, and the impregnation solution comes into contact with the food packaging boxes, impregnating the heavy metals into the impregnation solution. A steam reflux pipe and a steam reflux valve are provided. When the liquid level of the impregnation solution in the impregnation tank reaches a certain height, the steam reflux valve is opened, and the impregnation solution containing heavy metals flows into the collection bottle to complete one impregnation cycle.

[0010] Preferably, the connection point between the steam return pipe and the impregnation vessel is lower than the connection point between the impregnation liquid steam transport pipe and the impregnation vessel.

[0011] The connection point of the steam reflux pipe to the impregnation vessel should be set lower than the connection point of the impregnation liquid steam transport pipe to the impregnation vessel, such as... Figure 1 As shown, the steam return pipe is located at the bottom of the impregnation tank. Without external force, the impregnation liquid is returned to the collection tank by gravity, which is a reasonable design.

[0012] Furthermore, the impregnation vessel is equipped with an impregnation cylinder, and the impregnation barrel is equipped with a sieving cylinder.

[0013] Furthermore, each of the impregnation cylinders is provided with an impregnation cylinder hole, and each of the sieving cylinders is provided with a sieving cylinder hole, the size of which is larger than ...

[0014] Furthermore, a screening filter screen is provided on the screening holes.

[0015] Furthermore, the screening cylinder is equipped with a screen cylinder cover, and the screening cylinder is connected to the inner wall of the impregnation cylinder by a connecting spring.

[0016] Furthermore, the collection vessel is equipped with a magnetic rotor, and the bottom of the device body is equipped with a magnetic heating stirrer that matches the magnetic rotor.

[0017] Furthermore, the impregnation vessel is equipped with a vibrating motor that works in conjunction with the screening cylinder.

[0018] This application discloses an immersion device specifically for heavy metal detection in fast food packaging boxes.

[0019] This application involves placing the sample in an impregnation vessel and the impregnation solution in a collection vessel. When the impregnation solution vapor is transported to the impregnation vessel, the sample is impregnated. When the impregnation solution level in the impregnation vessel reaches a certain height, the steam reflux valve is opened, and the impregnation solution containing heavy metals reaches the collection vessel. After heating, the impregnation solution vapor is transported back to the impregnation vessel to impregnate the sample again. Compared with the food plastic packaging bag continuously soaked in the chemical solution in the food plastic packaging bag detection immersion device of patent CN202321840227.8, the device disclosed in this application ensures that the impregnation solution reaching the impregnation vessel through the impregnation solution vapor transport pipe does not contain heavy metals each time, and the impregnation speed will not decrease due to the increase in the concentration of heavy metals in the impregnation solution.

[0020] Beneficial effects:

[0021] (1) A heated impregnation solution is transported to the impregnation vessel through a steam transport pipe. The sample to be tested is placed in the impregnation vessel, and the impregnation solution comes into contact with the sample to impregnate or react with the heavy metals. A steam reflux pipe and a steam reflux valve are provided. When the liquid level of the impregnation solution in the impregnation vessel reaches a certain height, the steam reflux valve is opened, and the impregnation solution containing heavy metals flows into the collection vessel to complete one impregnation. Multiple impregnations are performed to impregnate the heavy metals in the sample to the impregnation solution as much as possible, thereby improving the accuracy of the detection.

[0022] (2) The connection position of the steam return pipe to the impregnation tank is set lower than the connection position of the impregnation liquid steam transport pipe to the impregnation tank. The steam return pipe is set at the bottom of the impregnation tank. Without external force, the impregnation liquid is returned to the collection tank by gravity. The design is reasonable. By installing a vibration motor, the screening cylinder can be vibrated to improve the impregnation efficiency.

[0023] (3) When the sample to be tested needs to be immersed for a long time, turn off the magnetic heating stirrer, steam transport valve and steam return valve to keep the immersion liquid in the immersion vessel, turn on the vibration motor to vibrate the sieve cylinder. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some preferred embodiments of this application, and not all embodiments. For those skilled in the art, other embodiments and drawings can be obtained based on these embodiments and drawings without creative effort, and all of them fall within the protection scope of this application.

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0026] In the diagram, 1 is the main body of the device, 2 is the collecting vessel, 3 is the impregnation vessel, 4 is the steam transport pipe, 5 is the steam transport valve, 6 is the steam return pipe, 7 is the steam return valve, 8 is the condenser, 9 is the impregnation cylinder, 10 is the screening cylinder, 11 is the magnetic rotor, 12 is the magnetic heating stirrer, and 13 is the vibration motor. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below. It should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. The foregoing definitions are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Example 1

[0029] An immersion device for detecting heavy metals in fast food packaging boxes, such as Figure 1 As shown, the device includes a main body 1, a collection vessel 2 inside the main body 1, an impregnation vessel 3 on top of the collection vessel 2, the collection vessel 2 and the impregnation vessel 3 being connected by an impregnation liquid steam transport pipe 4, a steam transport valve 5 being provided on the impregnation liquid steam transport pipe 4, a steam return pipe 6 being provided on the impregnation vessel 3, the other end of the steam return pipe 6 being connected to the collection vessel 2, a steam return valve 7 being provided on the steam return pipe 6, and the top of the impregnation vessel 3 being connected to a condenser 8.

[0030] The impregnation solution is placed in the collection vessel 2. The sample to be tested is crushed and placed in the impregnation vessel 3. The impregnation solution in the collection vessel 2 is heated and then reaches the impregnation vessel 3 through the impregnation solution steam transport pipe 4. The impregnation solution comes into contact with the sample to be tested in the impregnation vessel 3. The heavy metals in the sample to be tested react with the impregnation solution. Different impregnation solutions are selected for different metals. For example, when testing for iron in the sample, a dilute acid solution is used as the impregnation solution, and when testing for lead in the sample, a hydrochloric acid solution is used as the impregnation solution.

[0031] The heated impregnation solution is transported to the impregnation vessel 3 via a steam transport pipe 4. When the liquid level of the impregnation solution in the impregnation vessel 3 reaches a certain height via a steam return pipe 6 and a steam return valve 7, the steam return valve 7 is opened, and the impregnation solution containing heavy metals flows into the collection vessel 2 to complete one impregnation cycle.

[0032] Preferably, the connection position of the steam return pipe 6 to the impregnation vessel 3 is lower than the connection position of the impregnation liquid steam transport pipe 4 to the impregnation vessel 3.

[0033] The connection point between the steam return pipe 6 and the impregnation vessel 3 is set lower than the connection point between the impregnation liquid steam transport pipe 4 and the impregnation vessel 3, such as... Figure 1 As shown, the steam return pipe 6 is located at the bottom of the impregnation tank 3. Without external force, the impregnation liquid is returned to the collection tank 3 by gravity, which is a reasonable design.

[0034] Furthermore, the impregnation tank 3 is provided with an impregnation cylinder 9, and the impregnation cylinder 9 is provided with a sieving cylinder 10.

[0035] Furthermore, the impregnation cylinder 9 is provided with uniformly distributed impregnation cylinder holes, and the sieving cylinder 10 is provided with sieving cylinder holes, the size of the impregnation cylinder holes being larger than the size of the sieving cylinder holes.

[0036] By uniformly providing small holes on the impregnation cylinder 9 and providing small holes on the sieve cylinder 10, the impregnation liquid comes into contact with the sample to be tested in the sieve cylinder through the small holes of the impregnation cylinder and the small holes of the sieve cylinder. After impregnation is completed, the impregnation liquid flows back to the collection vessel 2 through the steam return pipe 6. The small holes of the impregnation cylinder and the small holes of the sieve cylinder play a filtering role, preventing the sample to be tested from flowing with the impregnation liquid and clogging the pipe.

[0037] Furthermore, a screening filter screen is provided on the screening holes.

[0038] By providing a sieve filter, the impregnation solution can pass through the sieve filter to reach the inside of the sieve cylinder 10, or it can pass through the sieve filter from inside the sieve cylinder 10 to outside the sieve cylinder 10. However, the sample to be tested inside the sieve cylinder 10 cannot reach the outside of the sieve cylinder 10 due to the small size of the sieve cylinder holes or the sieve filter, thus achieving the function of filtration.

[0039] Furthermore, the screening cylinder 10 is provided with a screen cylinder cover, and the screening cylinder 10 is connected to the inner wall of the impregnation cylinder 9 by a connecting spring.

[0040] Furthermore, the collection vessel 1 is equipped with a magnetic rotor 11, and the bottom of the device body 1 is equipped with a magnetic heating stirrer 12 that matches the magnetic rotor 11.

[0041] Furthermore, the impregnation tank 3 is equipped with a vibration motor 13 that cooperates with the screening cylinder 10.

[0042] By equipping the screen cylinder with a vibration motor, the impregnation efficiency can be improved.

[0043] When the sample to be tested needs to be immersed for a long time, turn off the magnetic heating stirrer, steam transport valve and steam return valve to keep the immersion liquid in the immersion vessel 3, turn on the vibration motor 13 to vibrate the sieve cylinder 10 and speed up the immersion speed.

[0044] Working principle: After the sample to be impregnated is crushed, it is placed in the sieve cylinder 10. The magnetic heating stirrer 12 is turned on. The impregnation liquid in the collection vessel 2 is heated and vaporized into impregnation liquid vapor. The impregnation liquid vapor reaches the impregnation vessel 3 through the impregnation liquid vapor transport pipe 4. It then enters the condenser 8 and is condensed into liquid. After passing through the small holes of the impregnation cylinder and the sieve cylinder, it comes into contact with the crushed sample to be tested, extracting (or reacting) the heavy metals in the sample into the impregnation liquid. When the liquid level of the impregnation liquid reaches a certain height, the steam reflux valve 7 is opened. The impregnation liquid containing heavy metals reaches the collection vessel 2. After being heated, the impregnation liquid passes through the steam transport pipe 4 again to the impregnation vessel 3, condenser 8, impregnation cylinder 9, and sieve cylinder 10 for impregnation again.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application, and all such modifications or substitutions should be covered within the scope of the claims of this application.

Claims

1. An immersion apparatus for detecting heavy metals in fast food packaging boxes, characterized in that, The device includes a main body (1), a collection vessel (2) is provided inside the main body (1), an impregnation vessel (3) is provided on the top of the collection vessel (2), the collection vessel (2) and the impregnation vessel (3) are connected by an impregnation liquid steam transport pipe (4), a steam transport valve (5) is provided on the impregnation liquid steam transport pipe (4), a steam return pipe (6) is provided on the impregnation vessel (3), the other end of the steam return pipe (6) is connected to the collection vessel (2), a steam return valve (7) is provided on the steam return pipe (6), and the top of the impregnation vessel (3) is connected to a condenser (8).

2. The immersion device for heavy metal detection in fast food packaging boxes as described in claim 1, characterized in that, The connection position of the steam return pipe (6) to the impregnation vessel (3) is lower than the connection position of the impregnation liquid steam transport pipe (4) to the impregnation vessel (3).

3. The immersion apparatus for heavy metal detection in fast food packaging boxes as described in claim 1, characterized in that, The impregnation tank (3) is equipped with an impregnation cylinder (9), and the impregnation cylinder (9) is equipped with a sieving cylinder (10).

4. The immersion device for heavy metal detection in fast food packaging boxes as described in claim 3, characterized in that, Each impregnation cylinder (9) is provided with an impregnation cylinder hole, and each sieve cylinder (10) is provided with a sieve cylinder hole. The size of the impregnation cylinder hole is larger than the size of the sieve cylinder hole.

5. The immersion apparatus for heavy metal detection in fast food packaging boxes as described in claim 4, characterized in that, The sieve cylinder is equipped with a sieve filter screen on the small hole.

6. The immersion apparatus for heavy metal detection in fast food packaging boxes as described in claim 4, characterized in that, The screening cylinder is provided with a screen cover, and the screening cylinder (10) is connected to the inner wall of the impregnation cylinder (9) by a connecting spring.

7. The immersion apparatus for heavy metal detection in fast food packaging boxes as described in claim 1, characterized in that, The collection vessel (2) is equipped with a magnetic rotor (11), and the bottom of the device body is equipped with a magnetic heating stirrer (12) that matches the magnetic rotor (11).

8. The immersion apparatus for heavy metal detection in fast food packaging boxes as described in claim 3, characterized in that, The impregnation vessel is equipped with a vibrating motor that works in conjunction with the screening cylinder.

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