Auxiliary extraction device for detecting pesticide residues in wine

Abstract

The utility model relates to the technical field of wine detection, in particular to an auxiliary extraction device for detecting pesticide residues in wine, which comprises a support frame, a liquid extraction mechanism and an extraction mechanism, wherein the liquid taking mechanism comprises a dosage pipe, a liquid storage tank, a first air inlet pipe and a second air inlet pipe, the liquid storage tank is arranged on the supporting frame, the dosage pipe is vertically arranged on the supporting frame, the upper end of the dosage pipe is connected with the liquid storage tank, the first air inlet pipe is connected with the liquid storage tank, the second air inlet pipe is connected with the upper end of the dosage pipe, and the extraction mechanism is arranged on the supporting frame and located below the dosage pipe. Automatic operation is achieved from liquid taking to liquid adding, and when a large number of samples and frequent experiment requirements are met, the automatic liquid taking and liquid adding mode relieves the burden of manual operation and saves the operation time, so that the working efficiency is improved, and the experiment progress is accelerated.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of wine detection, in particular to an auxiliary extraction device for pesticide residue detection in wine. BACKGROUND

[0002] Wine is a beverage obtained by fermenting fresh grapes or grape juice, and contains a large amount of polyphenols, sugars, pigments, vitamins and minerals, and the matrix is complex, which seriously interferes with the detection of trace pesticide residues. Therefore, the wine sample needs to be properly pretreated, and then gas chromatography-mass spectrometry is used to simultaneously qualitatively and quantitatively analyze various pesticide residues.

[0003] When the wine pesticide residue detection is pretreated, the processes of extraction, purification and concentration are usually adopted. In the purification process, the treatment methods mainly include liquid-liquid extraction, oscillation extraction, solid-phase extraction and solid-phase microextraction. When the solid-phase extraction method is used for purification, a specified dose of reagent needs to be added to the solid-phase extraction column at different time points in sequence. However, the current technical means mainly relies on manual extraction, transfer and addition of reagents by the operator. When facing a large number of samples and frequent experimental requirements, the manual operation method is time-consuming and laborious, which leads to low work efficiency and affects the progress of the experiment. CONTENT OF THE INVENTION

[0004] Therefore, it is necessary to provide an auxiliary extraction device for pesticide residue detection in wine, which can solve the above problems in the prior art.

[0005] The auxiliary extraction device for pesticide residue detection in wine comprises a support frame, a liquid taking mechanism and an extraction mechanism. The liquid taking mechanism comprises a dosing tube, a liquid storage tank, a first air inlet pipe and a second air inlet pipe. The liquid storage tank is arranged on the support frame, the dosing tube is vertically arranged on the support frame, and the upper end of the dosing tube is connected with the liquid storage tank. The first air inlet pipe is connected with the liquid storage tank, and the second air inlet pipe is connected with the upper end of the dosing tube. The extraction mechanism is arranged on the support frame and located below the dosing tube.

[0006] Preferably, the support frame is provided with a plurality of liquid taking mechanisms.

[0007] Preferably, the extraction mechanism is movably arranged on the support frame to move between the plurality of liquid taking mechanisms.

[0008] Preferably, the rotary disc is rotatably arranged on the support frame, a plurality of clamping arms are arranged along the circumferential direction of the arc surface of the rotary disc, a clamping hole is formed at the front end of each clamping arm, the diameter of the clamping hole is the same as the outer diameter of the extraction mechanism, a protection ring is arranged in the clamping hole, the clamping hole is located directly below the dosing tube, the extraction mechanism can be placed in the clamping hole, and a plurality of liquid taking mechanisms are arranged in the circumferential direction of the support frame.

[0009] Preferably, the support frame comprises an upper support portion and a lower support portion arranged below the upper support portion, and the upper support portion and the lower support portion are connected by a support column, a limiting plate is arranged between the upper support portion and the lower support portion, the liquid storage tank is arranged on the upper support portion, the dosing tube is arranged on the limiting plate, and the extraction mechanism is arranged on the lower support portion.

[0010] Preferably, a plurality of support columns are arranged in the circumferential direction.

[0011] Preferably, a liquid taking hose is arranged between the liquid storage tank and the dosing tube, one end of the liquid taking hose is arranged in the liquid storage tank and located at the bottom of the liquid storage tank.

[0012] Preferably, the gas inlet end of the second gas inlet pipe is connected with the first gas inlet pipe, and the gas outlet end of the second gas inlet pipe is connected with the lower end of the liquid taking hose.

[0013] Preferably, the support column is a lifting support column, the lower end of the dosing tube is provided with a baffle, and the lifting support column can move between a first position and a second position, in the first position, the baffle seals the inlet of the extraction mechanism, and in the second position, the baffle has a specified distance from the inlet of the extraction mechanism.

[0014] Preferably, a first control valve and a second control valve are arranged on the liquid taking hose and located on both sides of the position where the liquid taking hose is connected with the second gas inlet pipe, a third control valve is arranged on the first gas inlet pipe and located between the second gas inlet pipe and the liquid storage tank, a fourth control valve is arranged on the second gas inlet pipe, and a one-way valve is arranged at the liquid outlet end of the dosing tube.

[0015] The technical scheme adopted in the application can achieve the following beneficial effects:

[0016] In the auxiliary extraction device for detecting pesticide residues in wine disclosed in this application, gas is introduced into the storage tank to increase the internal pressure, causing the liquid in the tank to automatically flow into the dosing tube under pressure. This allows for the extraction of the required dosage of liquid into the dosing tube without manual operation. The extraction mechanism is positioned below the dosing tube, eliminating the need to move the tube and reducing the time required for liquid to transfer to the extraction mechanism. Furthermore, gas is introduced into the dosing tube through a second air inlet to appropriately increase the flow rate of the liquid, allowing it to be added to the extraction mechanism. Therefore, from liquid extraction to liquid addition, the entire process is automated. When dealing with large sample volumes and frequent experiments, this automated liquid extraction and addition reduces the burden of manual operation, saves time, improves work efficiency, and accelerates the experimental process. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of the auxiliary extraction device for detecting pesticide residues in wine disclosed in the embodiments of this application;

[0018] Fig. 2 This is another schematic diagram of the auxiliary extraction device for detecting pesticide residues in wine disclosed in the embodiments of this application.

[0019] Fig. 3 This is a schematic diagram of the liquid dispensing mechanism disclosed in the embodiments of this application, and the liquid storage tank therein is a perspective view.

[0020] The components include: support frame 100, upper support part 110, limiting plate 120, lower support part 130, support column 140, liquid taking mechanism 200, dosage tube 210, second control valve 211, one-way valve 212, baffle 213, liquid storage tank 220, liquid taking hose 230, first control valve 231, first air inlet pipe 240, third control valve 241, second air inlet pipe 250, fourth control valve 251, extraction mechanism 300, rotating disk 410, clamping arm 420, clamping hole 421, and recovery bottle 500. Detailed Implementation

[0021] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0022] It is to be understood that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that, when a term is used in this specification and / or claims - such as "horizontal" or "vertical" - that there are two possible orientations to the illustrated or claimed subject matter. It will also be understood that, when a term is used in this specification and / or claims - such as "left" or "right" - that there are two possible orientations to the illustrated or claimed subject matter. It will further be understood that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used in this specification and / or claims, specify the presence of stated features, regions, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and / or groups thereof.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0024] Reference will now be made to Figs. 1 to 3 The embodiment of the application discloses a kind of auxiliary extraction device for detecting pesticide residue in wine, including support frame 100, liquid taking mechanism 200 and extraction mechanism 300;Wherein, liquid taking mechanism 200 includes dosing tube 210, liquid storage tank 220, first air inlet pipe 240 and second air inlet pipe 250, liquid storage tank 220 is set to support frame 100, dosing tube 210 is vertically set to support frame 100, and its upper end is connected with liquid storage tank 220, first air inlet pipe 240 is connected with liquid storage tank 220, second air inlet pipe 250 is connected with the upper end of dosing tube 210, extraction mechanism 300 is set to support frame 100, and located below dosing tube 210.

[0025] Specifically, support frame 100 is the main support structure, for supporting liquid taking mechanism 200 and extraction mechanism 300, so that liquid taking mechanism 200 and extraction mechanism 300 can work more stably.Liquid storage tank 220 is as the container for storing extraction liquid, provides liquid in dosing tube 210, and is completely sealed tank body.And dosing tube 210 is as the container for measuring the dosage of added liquid, and the volume capacity in its tube is the dosage of required added liquid, when different dosages of liquid are required, replace dosing tube 210 with different capacity, first air inlet pipe 240 passes into gas into liquid storage tank 220, so that the liquid in liquid storage tank 220 can automatically enter into dosing tube 210 under the action of increased pressure.Second air inlet pipe 250 passes into gas into dosing tube 210, so as to appropriately speed up the flow rate of liquid in dosing tube 210.Extraction mechanism 300 is solid-phase extraction column, to extract wine sample required to be detected.

[0026] When the device is used, the first air inlet pipe 240 is connected to the air pump to introduce air into the liquid storage tank 220, so as to increase the pressure inside the liquid storage tank 220, and the liquid in the liquid storage tank 220 is automatically introduced into the dosing pipe 210 under the action of the pressure. When the liquid in the dosing pipe 210 reaches the maximum capacity (when different dosages of liquid are required, different capacity dosing pipes 210 can be replaced), the air introduction into the liquid storage tank 220 is stopped. When the next extraction work is performed, the second air inlet pipe 250 is connected to the air pump to introduce air into the dosing pipe 210, so that the liquid in the dosing pipe 210 flows into the extraction mechanism 300 for extraction.

[0027] The auxiliary extraction device for detecting pesticide residues in wine has at least the following beneficial effects: air is introduced into the liquid storage tank 220 through the first air inlet pipe 240, the pressure inside the liquid storage tank 220 is increased, and the liquid in the tank automatically flows into the dosing pipe 210 under the action of the pressure, without manual operation, and the required dosage of liquid can be extracted into the dosing pipe 210. The extraction mechanism 300 is placed below the dosing pipe 210, and the liquid addition work can be performed without transferring the dosing pipe 210, which reduces the time for transferring the liquid in the pipe to the upper part of the extraction mechanism 300. In addition, air is introduced into the dosing pipe 210 through the second air inlet pipe 250, which appropriately accelerates the flow rate of the liquid in the dosing pipe 210, so that the liquid in the dosing pipe 210 can be added to the extraction mechanism 300. Therefore, from liquid extraction to liquid addition, all operations are automated. In the face of a large number of samples and frequent experimental requirements, the automated liquid extraction and liquid addition method reduces the burden of manual operation and saves operation time, thereby improving work efficiency and accelerating the progress of experiments.

[0028] In an embodiment, in order to be able to add different types of liquid in sequence, the support frame 100 is arranged with a plurality of liquid taking mechanisms 200.

[0029] In an embodiment, the extraction mechanism 300 is movably arranged on the support frame 100 to move between the lower parts of the plurality of liquid taking mechanisms 200.

[0030] In an embodiment, a rotating disc 410 is further included, which is rotationally arranged on the support frame 100, and a plurality of clamping arms 420 are arranged along the circumferential direction of the arc surface of the rotating disc 410, and a clamping hole 421 is formed at the front end of each clamping arm 420, the diameter of the clamping hole 421 is the same as the outer diameter of the extraction mechanism 300, a protection ring is arranged in the clamping hole 421, the clamping hole 421 is located directly below the dosing pipe 210, the extraction mechanism 300 can be placed in the clamping hole 421, and the support frame 100 is circumferentially arranged with a plurality of liquid taking mechanisms 200.

[0031] Specifically, the rotating disc 410 can not only limit the placement height of the extraction mechanism 300, but also drive the extraction mechanism 300 to rotate under the plurality of liquid taking mechanisms 200 to sequentially add different liquids. The outer circular surface of the rotating disc 410 is provided with a plurality of clamping arms 420, which can simultaneously clamp a plurality of extraction mechanisms 300. The clamping hole 421 is a placement hole for fixing the position of the extraction mechanism 300. A plurality of clamping holes 421 correspond to the positions directly below a plurality of dosing tubes 210, so as to ensure that the rotation center of the rotating disc 410 and the center of the circumferential array of the plurality of liquid taking mechanisms 200 are located on the same center line. The protection ring is installed in the clamping hole 421 and has the same height as the clamping hole 421. The protection ring is a sponge ring or a protection ring made of elastic material, which can protect the surface of the extraction mechanism 300 from being scratched and make the extraction mechanism 300 more firmly placed in the clamping hole 421.

[0032] When the above device is used, the extraction mechanism 300 is placed in the clamping hole 421 below the dosing tube 210 containing the first liquid, and after the extraction mechanism 300 is stably placed, the first liquid is added to the extraction mechanism 300 for activation. After the addition of the first liquid is completed, the motor connected with the rotating disc 410 is started to drive the rotating disc 410 to rotate by a specified angle, so that the clamping arm 420 with the extraction mechanism 300 rotates to the position below the dosing tube 210 containing the second liquid, and the second liquid is added to the extraction mechanism 300 for sample loading. In this way, the third and fourth liquids are sequentially added for elution and elution, so as to complete the extraction of pesticide residues in the wine sample. Through the rotation of the rotating disc 410, the extraction mechanism 300 can be automatically moved to the position below the next dosing tube 210 without manual intervention, which not only reduces the consumption of human resources, but also improves the convenience and automation level of the extraction process.

[0033] In addition, the dosing tube 210 for adding liquid is fixed, and the addition sequence of the liquid is also fixed, while the extraction mechanism 300 can be driven by the clamping arm 420 to rotate to the position below the dosing tube 210 containing different liquids. Therefore, when the first extraction mechanism 300 rotates to the position below the dosing tube 210 containing the second liquid after the first extraction mechanism 300 completes the addition of the first liquid, the extraction mechanism 300 on the next clamping arm 420 also rotates to the position below the dosing tube 210 containing the first liquid for liquid addition. In this way, the plurality of clamping arms 420 drive the plurality of extraction mechanisms 300 to sequentially and automatically add liquids according to the addition sequence, so as to simultaneously add different liquids to a plurality of samples, thereby simultaneously extracting a plurality of samples and significantly improving the work efficiency and shortening the extraction progress. The present application can extract one sample or simultaneously extract a plurality of samples.

[0034] When the extraction mechanism 300 is placed and replaced into the clamping hole 421, the rotating disc 410 can drive the clamping arm 420 to rotate to a position between the two dosing tubes 210, so as to conveniently and flexibly place and replace the extraction mechanism 300.

[0035] In an embodiment, the support frame 100 comprises an upper support part 110 and a lower support part 130 arranged below the upper support part 110, and the two are connected by the support column 140. The upper support part 110 and the lower support part 130 are provided with the limiting plate 120 therebetween. The liquid storage tank 220 is arranged on the upper support part 110, the dosing tube 210 is arranged on the limiting plate 120, and the extraction mechanism 300 is arranged on the lower support part 130.

[0036] Specifically, the upper support part 110 is mainly used for placing and supporting the liquid storage tank 220, the limiting plate 120 is used for limiting and fixing the dosing tube 210, the lower support part 130 is mainly used for placing and supporting the extraction mechanism 300, and the support column 140 is mainly used for connecting the upper support part 110, the lower support part 130 and the limiting plate 120.

[0037] In an embodiment, in order to improve the stability of the support frame 100 as a whole, the support column 140 is arranged in a circumferential array.

[0038] In an embodiment, the liquid storage tank 220 and the dosing tube 210 are provided with the liquid taking hose 230. One end of the liquid taking hose 230 penetrates into the liquid storage tank 220 and is located at the bottom of the liquid storage tank 220.

[0039] Specifically, when the liquid storage tank 220 is directly connected with the dosing tube 210, the head bottle of the tank body is in an upside-down state, and the sealing performance is poor. The upside-down state may cause liquid leakage. The liquid taking hose 230 is used as a medium for transporting the liquid in the liquid storage tank 220 to the dosing tube 210, and penetrates into the bottom of the liquid storage tank 220. Therefore, the head bottle of the liquid storage tank 220 is placed in a normal state. When the sealing performance of the tank body is poor, the normal placement of the tank body will not cause liquid leakage. In addition, when the tank body is placed in a normal state, the contact area between the bottom of the tank body and the placement surface is large, and the center of gravity is low, thereby improving the overall stability of the tank body.

[0040] In an embodiment, the gas inlet end of the second gas inlet pipe 250 is connected with the first gas inlet pipe 240, and the gas outlet end of the second gas inlet pipe 250 is connected with the lower end of the liquid taking hose 230.

[0041] Specifically, the first air inlet pipe 240 and the second air inlet pipe 250 are connected, so that the gas source comes from the same air pump, reducing the production cost. When the device is not in use, the second air inlet pipe 250 is used to blow gas into the liquid taking hose 230, so that the residual liquid in the liquid taking hose 230 is blown into the liquid storage tank 220, so that the liquid remaining in the liquid taking hose 230 can flow back to the liquid storage tank 220, so that the liquid taking hose 230 remains liquid-free, and the liquid in the liquid taking hose 230 does not stay for a long time, affecting the service life of the liquid taking hose 230.

[0042] When the liquid is blown back into the liquid storage tank 220, the liquid storage tank 220 is in a sealed state, and the liquid cannot be blown back. Therefore, a valve-controlled air outlet is provided at the tank opening of the liquid storage tank 220, and when it is necessary to blow the liquid remaining in the liquid taking hose 230 back into the liquid storage tank 220, the air outlet is opened, so that the pressure in the tank is reduced, ensuring that the liquid in the liquid taking hose 230 can be smoothly blown back into the liquid storage tank 220.

[0043] In an embodiment, the support column 140 is a lifting support column, and the lower end of the dosing tube 210 is provided with a baffle 213. The lifting support column can move between a first position and a second position. In the first position, the baffle 213 seals the inlet of the extraction mechanism 300, and in the second position, the baffle 213 has a specified distance (which can be 10 cm, 15 cm, which is not limited in the present application) from the inlet of the extraction mechanism 300.

[0044] Specifically, when the lifting support column is not working, it is in the second position. When the liquid addition in the dosing tube 210 is completed, the lifting support column lowers the liquid taking mechanism 200 as a whole to the first position, so that the baffle 213 seals the inlet of the extraction mechanism 300. The second air inlet pipe 250 blows gas into the extraction mechanism 300, which appropriately accelerates the liquid flow rate in the extraction mechanism 300, thereby reducing the extraction time. The baffle 213 ensures that when the gas is blown into the extraction mechanism 300, the liquid will not splash out under the pressure of the gas, causing a decrease in the liquid dose and causing errors in the experiment. After the extraction is completed, the lifting support column raises the liquid taking mechanism 200 as a whole to the second position, so that the baffle 213 has a specified distance from the inlet of the extraction mechanism 300.

[0045] In an embodiment, a plurality of recovery bottles 500 are arranged on the lower support part 130, and the recovery bottles 500 are located directly below the extraction mechanism 300.

[0046] Specifically, the liquid in the dosing tube 210 is discharged to the extraction mechanism 300, and the recovery bottle 500 recovers the waste liquid and sample liquid generated in the extraction mechanism 300. The recovery bottle 500 is not connected to the extraction mechanism 300 by a pipe, so that the liquid after extraction directly flows into the recovery bottle 500, and the liquid is not adhered to the pipe, thereby reducing the error in the experiment.

[0047] In an embodiment, the liquid taking hose 230 is provided with a first control valve 231 and a second control valve 211 on both sides of the connection between the liquid taking hose 230 and the second air inlet pipe 250, the first air inlet pipe 240 is provided with a third control valve 241 between the second air inlet pipe 250 and the liquid storage tank 220, the second air inlet pipe 250 is provided with a fourth control valve 251, and the liquid outlet end of the dosing tube 210 is provided with a one-way valve 212.

[0048] Specifically, the opening and closing of all the control valves can be adjusted by manual or automatic control, so as to better perform the work of liquid taking, adding, and extraction.

[0049] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0050] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An auxiliary extraction device for detecting pesticide residues in wine, characterized in that, The device includes a support frame, a liquid collection mechanism, and an extraction mechanism. The liquid collection mechanism includes a dosing tube, a storage tank, a first air inlet pipe, and a second air inlet pipe. The storage tank is mounted on the support frame. The dosing tube is vertically mounted on the support frame and its upper end is connected to the storage tank. The first air inlet pipe is connected to the storage tank, and the second air inlet pipe is connected to the upper end of the dosing tube. The extraction mechanism is mounted on the support frame and located below the dosing tube.

2. The auxiliary extraction device for detecting pesticide residues in wine according to claim 1, characterized in that, The support frame array is equipped with several of the liquid extraction mechanisms.

3. The auxiliary extraction device for detecting pesticide residues in wine according to claim 2, characterized in that, The extraction mechanism is movably mounted on the support frame so as to move between the liquid collection mechanisms below it.

4. The auxiliary extraction device for detecting pesticide residues in wine according to claim 1 or 2, characterized in that, It also includes a rotating disk, which is rotatably mounted on the support frame. Several clamping arms are arranged along the circumferential direction of the arc surface of the rotating disk. The clamping arms have clamping holes at their front ends. The diameter of the clamping holes is the same as the outer diameter of the extraction mechanism. A protective ring is provided inside the clamping holes. The clamping holes are located directly below the dosing tube. The extraction mechanism can be placed inside the clamping holes. Several liquid-taking mechanisms are arranged in a circumferential array on the support frame.

5. The auxiliary extraction device for detecting pesticide residues in wine according to claim 1, characterized in that, The support frame includes an upper support portion and a lower support portion disposed below the upper support portion, and the two are connected by a support column. A limit plate is provided between the upper support portion and the lower support portion. The liquid storage tank is disposed on the upper support portion, the dosing tube is disposed on the limit plate, and the extraction mechanism is disposed on the lower support portion.

6. The auxiliary extraction device for detecting pesticide residues in wine according to claim 5, characterized in that, The support column circumferential array consists of several columns.

7. The auxiliary extraction device for detecting pesticide residues in wine according to claim 5, characterized in that, A liquid extraction hose is provided between the liquid storage tank and the dosing tube, with one end of the liquid extraction hose extending into the liquid storage tank and located at the bottom of the liquid storage tank.

8. The auxiliary extraction device for detecting pesticide residues in wine according to claim 7, characterized in that, The air inlet end of the second air inlet pipe is connected to the first air inlet pipe, and the air outlet end of the second air inlet pipe is connected to the lower end of the liquid collection hose.

9. The auxiliary extraction device for detecting pesticide residues in wine according to claim 8, characterized in that, The support column is a lifting support column, and a baffle is provided at the lower end of the dosing tube. The lifting support column can move between a first position and a second position. In the first position, the baffle seals and covers the inlet of the extraction mechanism. In the second position, there is a specified distance between the baffle and the inlet of the extraction mechanism.

10. The auxiliary extraction device for detecting pesticide residues in wine according to claim 9, characterized in that, The liquid collection hose is equipped with a first control valve and a second control valve, located on both sides of the connection between the liquid collection hose and the second air inlet pipe. The first air inlet pipe is equipped with a third control valve, located between the second air inlet pipe and the liquid storage tank. The second air inlet pipe is equipped with a fourth control valve. The liquid outlet of the dosing tube is equipped with a one-way valve.

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