Treatment system for detecting content of available silicon in soil by using plasma spectrum device

Abstract

The utility model discloses a treatment system for detecting the content of available silicon in soil through a plasma spectrum device, and relates to the technical field of detection equipment. According to the technical key points, the device comprises a working platform, a first counterweight base is placed on the working platform, a main mounting vertical rod is fixedly connected to the first counterweight base, and an extraction measuring cup, a separation funnel and a collection container are sequentially arranged on one side of the main mounting vertical rod from top to bottom in the vertical direction; an ultrasonic cleaning rod is inserted into the extraction measuring cup; the ultrasonic cleaning rod is installed on the placing frame through a clamp, a distributing hose is connected to the collecting container, and the end, away from the collecting container, of the distributing hose is connected with the input end of the peristaltic pump. According to the treatment system for detecting the effective silicon content of the soil through the plasma spectrum device, the solution is vibrated mainly through the ultrasonic cleaning rod, so that the extraction efficiency is obviously improved, and the corresponding detection period is also shortened.

Description

Technical Field

[0001] The present application relates to the technical field of detection equipment, and in particular to a processing system for detecting effective silicon content in soil using a plasma spectroscopy device. Background Art

[0002] Available silicon in soil refers to silicon in the soil that is soluble in water or weak acid solution and can be absorbed by plant growth. Available silicon is an essential element for plant growth and development. It can be directly absorbed and utilized by plant roots and is one of the beneficial trace elements in cultivated soil. Available silicon in soil can promote the conversion of phosphorus in the soil into effective phosphorus that is easily absorbed by plants, reduce the absorption of heavy metal elements by plants, reduce mineral toxicity and abiotic stress effects, increase plant chlorophyll content and enhance plant disease resistance and stress resistance, etc., which can significantly improve the quality and yield of economic crops. The amount of silicon absorbed by plants during growth mainly depends on the content of available silicon in the soil, and the supply of available silicon in the soil is mainly affected by the parent material and its physical and chemical properties (such as acidity, etc.). However, the available silicon content in the soil will gradually decrease with the large-scale application of chemical fertilizers. When the available silicon in the soil is deficient, it will affect the growth and metabolism of plants. Therefore, when studying soil, the available silicon content in the soil is a necessary detection indicator.

[0003] At present, the detection methods related to effective silicon in soil include potassium fluorosilicate volumetric method, gravimetric method, inductively coupled plasma atomic emission spectrometry (ICP-AES), etc. When using the ICP-AES method to determine the effective silicon content in soil, the required sample needs to be in a solution state. For solid soil, the soil sample needs to be dissolved into a liquid for analysis and testing. This process is also called leaching. The general method is to use citric acid leaching agent and the sample to stand in a constant temperature box at 30°C for 5 hours. This process mainly relies on the natural dissolution and transfer of soluble matter in the sample to the leaching agent. Therefore, the current spectral device measurement solution has a long leaching time in the preparation. The detection of effective silicon in the soil is often carried out in batches, which will lead to a longer analysis and test cycle and reduced analysis efficiency. Utility Model Content

[0004] The present application provides a processing system for detecting effective silicon content in soil using a plasma spectroscopy device, which can effectively improve the efficiency of preparing a solution for detection using the plasma spectroscopy device.

[0005] The above-mentioned purpose of the present application is achieved through the following technical solutions:

[0006] A processing system for detecting effective silicon content in soil by a plasma spectrum device, comprising a working platform, a first counterweight base is placed on the working platform, a main mounting pole is fixedly connected to the first counterweight base, and an extraction measuring cup, a separation funnel and a collection container are arranged on one side of the main mounting pole in a vertical direction from top to bottom;

[0007] An ultrasonic cleaning rod is inserted into the extraction measuring cup, and there is a gap between the lower end of the ultrasonic cleaning rod and the bottom of the extraction measuring cup; the ultrasonic cleaning rod is installed on the placement rack through a clamp, and the placement rack is placed on the working platform on the side of the extraction measuring cup away from the installation vertical rod;

[0008] A feeding hose is connected to the collection container, and one end of the feeding hose away from the collection container is connected to the input end of the peristaltic pump.

[0009] Further, a first placement ring, a second placement ring and a horizontal adjustment frame are sequentially arranged on the side of the main installation vertical rod close to the placement rack from bottom to top in the vertical direction;

[0010] The collection container is placed on the first placement ring, the separation funnel is placed on the second placement ring, and the extraction measuring cup is movably installed on the horizontal adjustment frame.

[0011] Further, the horizontal adjustment frame includes a U-shaped frame horizontally arranged above the second placement ring. The middle position of the closed end of the U-shaped frame is fixedly connected through a connecting rod and a guide post. The guide post is sleeved on the main installation vertical rod and the two are coaxially arranged. A first adjustment bolt is inserted on the side of the guide post away from the connecting column and the two are threadedly connected;

[0012] Two horizontal brackets are symmetrically arranged on the inner side of the open end of the U-shaped frame; the mutually close ends of the two horizontal brackets both extend upward in the vertical direction, and a placement groove is arranged at the top of the upward extension section of the horizontal bracket;

[0013] Two inverted L-shaped hanging rods are symmetrically arranged at the upper port of the extraction measuring cup, and the horizontal sections of the two hanging rods are respectively placed in the placement grooves of the two horizontal brackets.

[0014] Further, the placement rack includes a second counterweight base, and a vertical fixing rod is fixedly installed at the middle position on the upper side of the second counterweight base, and the clamp is installed on the fixing rod.

[0015] Further, the clamp is a laboratory universal clamp. The rod part of the laboratory universal clamp is sleeved on the fixing rod through a slider away from its opening end, and a second adjustment bolt is inserted on the slider and the two are threadedly connected.

[0016] Further, one end of the feeding hose away from the peristaltic pump is installed at the bottom of the collection container.

[0017] Further, a socket is fixedly connected to the lower side of the middle position of the bottom of the collection container. The socket is communicated with the internal space of the collection container. A rubber sealing plug is fixedly installed in the socket. A plastic needle is fixedly connected to the end of the dispensing hose away from the peristaltic pump. The plastic needle passes upward through the rubber sealing plug and is communicated with the internal space of the collection container.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] After the test personnel add the soil sample and the leaching agent into the leaching measuring cup in proportion, the ultrasonic cleaning rod is started. The ultrasonic cleaning rod inserted in the leaching measuring cup can generate high-frequency vibrations, thereby accelerating the transfer of soluble substances in the sample to the leaching agent. Compared with the traditional method of simply mixing the leaching agent and the sample and relying solely on the sample to naturally transfer the soluble substances in itself to the leaching agent, the leaching efficiency achieved by vibrating the solution with the ultrasonic cleaning rod in the present application is significantly improved, and the corresponding detection period can also be effectively shortened. After the leaching is completed, there will still be some insoluble substances in the leaching measuring cup. If they are directly used in the plasma spectroscopy device, it is very easy to damage the atomization parts of the plasma spectroscopy device. Therefore, a separation funnel is provided under the leaching measuring cup in the present application to separate the solid and liquid after leaching. The separated liquid will flow into the collection container, and then after the peristaltic pump is started, these clean leached solutions will be pumped from the collection container to the plasma spectroscopy device through the dispensing hose. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is the overall structural schematic diagram of the present application;

[0022] Figure 2 is the structural schematic diagram of the leaching measuring cup and the horizontal adjustment frame;

[0023] Figure 3 is the structural schematic diagram after the plastic needle at the end of the dispensing hose of the present application is pulled out from the socket at the bottom of the collection container.

[0024] Reference numerals: 1, working platform; 2, first counterweight base; 3, main installation vertical rod; 4, extraction measuring cup; 5, separation funnel; 6, collection container; 7, ultrasonic cleaning rod; 8, fixture; 9, placement rack; 91, second counterweight base; 92, fixing rod; 10, dispensing hose; 11, peristaltic pump; 12, first placement ring; 13, second placement ring; 14, horizontal adjustment frame; 141, U-shaped frame; 142, connecting rod; 143, guide post; 144, first adjustment bolt; 145, horizontal bracket; 146, placement groove; 147, suspension rod; 15, slider; 16, second adjustment bolt; 17, socket; 18, rubber seal plug; 19, plastic needle. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts also belong to the scope of protection of the present application.

[0026] As Figure 1 shown, a processing system for detecting the available silicon content in soil by a plasma spectroscopy device disclosed in the present application includes a working platform 1. A first counterweight base 2 is placed on the working platform 1. A main installation vertical rod 3 is fixedly connected to the first counterweight base 2. An extraction measuring cup 4, a separation funnel 5 and a collection container 6 are successively arranged from top to bottom along the vertical direction on one side of the main installation vertical rod 3.

[0027] An ultrasonic cleaning rod 7 is inserted into the extraction measuring cup 4, and there is a gap between the lower end of the ultrasonic cleaning rod 7 and the bottom of the extraction measuring cup 4. The ultrasonic cleaning rod 7 is installed on a placement rack 9 through a fixture 8, and the placement rack 9 is placed on the working platform 1 on the side of the extraction measuring cup away from the installation vertical rod.

[0028] A dispensing hose 10 is connected to the collection container 6, and the end of the dispensing hose 10 away from the collection container 6 is connected to the input end of a peristaltic pump 11.

[0029] In the above embodiments, since the extraction measuring cup 4, the separation funnel 5, the collection container 6, etc. are all installed on one side of the main installation vertical rod 3, in order to prevent them from tipping over due to the center of gravity shift, a first counterweight base 2 is provided at the bottom of the main installation vertical rod 3. When in use, the extraction measuring cup 4 can be used to place the pre-prepared citric acid extraction agent and the soil sample to be detected. A filter paper can be placed in the separation funnel 5 to filter the mixed solution that has been extracted in the extraction measuring cup 4, so as to intercept the insoluble substances in the mixed solution to prevent damage to the equipment when used in the subsequent inductively coupled plasma optical emission spectrometer. The collection container 6 is located below the separation funnel 5 and can receive all the clean solution separated by the separation funnel 5, and then directly send it to the inductively coupled plasma optical emission spectrometer through the supply hose 10 and the peristaltic pump 11 (the peristaltic pump 11 is part of the sample introduction system in the inductively coupled plasma optical emission spectrometer. When the inductively coupled plasma optical emission spectrometer injects samples, the peristaltic pump 11 drives the solution to flow through the sample injection pump tube, enters the nebulizer and is atomized to form an aerosol, and then enters the plasma after being separated by the spray chamber. This part belongs to the prior art and will not be elaborated here).

[0030] Before the tester tests the soil sample, first add the soil sample and the extraction agent to the extraction measuring cup 4 in proportion, and then start the ultrasonic cleaning rod 7. The ultrasonic cleaning rod 7 can be suspended and inserted into the extraction measuring cup 4 through the fixture 8 on the placement rack 9. After being started, the ultrasonic cleaning rod 7 can generate high-frequency vibrations in the extraction measuring cup 4. Through the acoustic conduction of the solution in the extraction measuring cup 4, the particles in the liquid vibrate to form holes and vortex flows, thereby accelerating the dissolution of substances. From a physical perspective, when ultrasonic waves vibrate a liquid, a high-energy sonochemical cavitation zone will be generated. When a bubble forms, due to the effect of liquid elasticity, the pressure inside the bubble will increase, and finally reach the point of rupture. When the bubble ruptures, it will release high-temperature and high-pressure gas, causing the liquid phase temperature and pressure to change violently, promoting the decomposition and dispersion of the solute. Compared with the traditional method of simply mixing the extraction agent and the sample and relying solely on the sample to naturally transfer the soluble substances in itself to the extraction agent, the extraction efficiency and detection achieved by vibrating the solution with the ultrasonic cleaning rod 7 in this application are significantly improved, and the corresponding detection cycle can also be effectively shortened.

[0031] Furthermore, as Figures 1 - 3 shown, a first placement ring 12, a second placement ring 13, and a horizontal adjustment frame 14 are successively provided along the vertical direction on the side of the main installation vertical rod 3 close to the placement rack 9;

[0032] The collection container 6 is placed on the first placement ring 12, the separation funnel 5 is placed on the second placement ring 13, and the extraction measuring cup 4 is movably installed on the horizontal adjustment frame 14.

[0033] In the above embodiments, the first placement ring 12 and the second placement ring 13 are each composed of a circular iron ring and a crossbar. The two crossbars are both installed on the main installation vertical rod 3, and the diameter of the iron ring in the second placement ring 13 is smaller than the diameter of the upper port of the separation funnel 5, and the diameter of the iron ring in the first placement ring 12 is smaller than the diameter of the upper port of the collection container 6. This ensures that the separation funnel 5 will not fall off after being placed on the second placement ring 13 and the collection container 6 will not fall off after being placed on the first placement ring 12. The extraction measuring cup 4 of the present application is movably installed at the horizontal adjustment frame 14 on the main installation vertical rod 3. After the extraction work on the sample is completed in the extraction measuring cup 4, the tester can quickly pour the mixed solution in the extraction measuring cup 4 downward into the separation funnel 5.

[0034] Further, as Figure 1 and Figure 2 shown, the horizontal adjustment frame 14 includes a U-shaped frame 141 horizontally arranged above the second placement ring 13. The middle position of the closed end of the U-shaped frame 141 is fixedly connected through a connecting rod 142 and a guide post 143. The guide post 143 is sleeved on the main installation vertical rod 3 and they are coaxially arranged. A first adjustment bolt 144 is inserted on the side of the guide post 143 away from the connecting column and they are threadedly connected;

[0035] Two horizontal brackets 145 are symmetrically arranged inside the open end of the U-shaped frame 141; the mutually approaching ends of the two horizontal brackets 145 both extend upward in the vertical direction, and a placement groove 146 is provided at the top of the upward extending section of the horizontal bracket 145;

[0036] Two inverted L-shaped hanging rods 147 are symmetrically arranged at the upper port of the extraction measuring cup 4, and the horizontal sections of the two hanging rods 147 are respectively placed in the placement grooves 146 of the two horizontal brackets 145.

[0037] In the above embodiments, the extraction measuring cup 4 can just be suspended in the placement grooves 146 of the two horizontal brackets 145 symmetrically arranged inside the open end of the U-shaped frame 141 through the two inverted L-shaped hanging rods 147 at the upper port, and the closed end of the U-shaped frame 141 is installed on the main installation vertical rod 3 through the connecting rod 142 and the guide post 143. In this way, a stable supporting force can be provided for the extraction measuring cup 4. Since the hanging rods 147 on the extraction measuring cup 4 are placed in the placement grooves 146 of the horizontal brackets 145, after the extraction of the sample is completed, the tester can quickly remove the extraction measuring cup 4 and pour the mixed solution inside it into the separation funnel 5. In addition, after adding the extraction agent and the sample to be tested into the extraction measuring cup 4, the tester can also shake the extraction measuring cup 4 before starting the ultrasonic cleaning rod 7 to shake the extraction agent and the sample to be tested in the extraction measuring cup 4, so that after the ultrasonic cleaning rod 7 is started, the extraction efficiency of the soluble substances in the sample can be further improved.

[0038] Further, as Figure 1As shown, the placement rack 9 includes a second counterweight base 91. At the middle position on the upper side of the second counterweight base 91, a vertical fixed rod 92 is fixedly installed, and the clamp 8 is installed on the fixed rod 92.

[0039] In the above embodiments, the second counterweight base 91 can provide a solid foundation for the fixed rod 92 to prevent the clamp 8 on the fixed rod 92 from tipping over due to the center of gravity shifting after the ultrasonic cleaning rod 7 is fixed.

[0040] Further, as Figure 1 shown, the clamp 8 is a laboratory universal clamp. The rod part of the laboratory universal clamp away from its opening end is sleeved on the fixed rod 92 through a slider 15, and a second adjusting bolt 16 is inserted into the slider 15 and is threadedly connected therebetween.

[0041] In the above embodiments, the laboratory universal clamp is a commonly used tool in the prior art to fix test containers such as test tubes, beakers, and burettes on a test rack. The opening of this clamp 8 is not only adjustable to adapt to ultrasonic cleaning rods 7 of different specifications, but also convenient for installation and disassembly. The slider 15 connected to the rod part of the laboratory universal clamp away from its opening end is sleeved on the fixed rod 92, and a second adjusting bolt 16 connected by threading is inserted into the slider 15. In this way, the experimenter can freely adjust the position of the laboratory universal clamp along the fixed rod 92 after loosening the second adjusting bolt 16, and after adjusting the position, tighten the second adjusting bolt 16 to fix the laboratory universal clamp and the ultrasonic cleaning rod 7 clamped by it at the required height on the fixed rod 92.

[0042] Further, as Figure 1 and Figure 3 shown, one end of the dispensing hose 10 away from the peristaltic pump 11 is installed at the bottom of the collection container 6.

[0043] In the above embodiments, the dispensing hose 10 is connected to the bottom of the collection container 6, so that even if there is only a small amount of the solution to be measured at the bottom of the collection container 6, the peristaltic pump 11 can easily extract it through the dispensing hose 10.

[0044] Further, as Figure 3 shown, a socket 17 is fixedly connected to the lower side of the middle position at the bottom of the collection container 6. The socket 17 is communicated with the internal space of the collection container 6. A rubber sealing plug 18 is fixedly installed in the socket 17. One end of the dispensing hose 10 away from the peristaltic pump 11 is fixedly connected with a plastic needle 19. The plastic needle 19 passes upward through the rubber sealing plug 18 and is communicated with the internal space of the collection container 6.

[0045] In the above embodiment, the rubber seal plug 18 in the plug port 17 at the bottom of the collection container 6 can block the plug port 17 to prevent the solution in the collection container 6 from leaking out of the plug port 17. When the dispensing hose 10 penetrates the rubber seal plug 18 in the plug port 17 through the plastic needle 19 at its end, a channel for the plastic needle 19 to pass through is automatically generated in the rubber seal plug 18. At the same time, the rubber seal plug 18 generates elastic force due to extrusion in the contact area between it and the plastic needle 19, thereby blocking the gap around the plastic needle 19. In this way, it can be ensured that after the plastic needle 19 penetrates, no leakage will occur at the rubber seal plug 18. Since the dispensing hose 10 only needs to penetrate the rubber seal plug 18 at the bottom of the collection container 6 through the plastic needle 19 when connecting with the collection container 6, when the dispensing hose 10 and the collection container 6 need to be disconnected later, the tester can directly pull out the plastic needle 19 at the end of the dispensing hose 10, which is simple and convenient to operate. Moreover, after the plastic needle 19 is pulled out, the rubber sealing plug 18 will automatically reset under the action of elastic force to block the passage left after the plastic needle 19 is pulled out, so that the collection container 6 can always maintain a good storage capacity.

[0046] The implementation principle of this embodiment is as follows: when in use, the test personnel add the soil sample and the leaching agent to the leaching measuring cup 4 in proportion, place the suspension rod 147 at the upper port of the leaching measuring cup 4 in the placement groove 146 of the horizontal bracket 145 on the horizontal adjustment frame 14, and then swing the leaching measuring cup 4 to mix the leaching agent and the sample inside. Next, adjust the position of the clamp 8 on the fixed rod 92 in the placement frame 9 until the ultrasonic cleaning rod 7 fixed by the clamp 8 extends into the leaching measuring cup 4, and then start the ultrasonic cleaning rod 7. The ultrasonic cleaning rod 7 inserted in the leaching measuring cup 4 can accelerate the transfer of solubles in the sample to the leaching agent by generating high-frequency vibration, significantly improve the leaching efficiency, and shorten the detection cycle. After the leaching is completed, the test personnel can directly pour the mixed solution in the leaching measuring cup 4 into the separation funnel 5 equipped with filter paper, and the solid impurities in the mixed solution are intercepted by the filter paper in the separation funnel 5 to prevent them from directly entering the plasma spectrum device and damaging the equipment, and the separated clean liquid will flow into the collection container 6. During subsequent testing, the peristaltic pump 11 can be started to absorb the solution to be tested from the collection container 6 through the distribution hose 10, and then transported to the plasma spectrometer for testing.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A processing system for detecting the available silicon content in soil by a plasma spectroscopy device, characterized in that: It includes a working platform (1) on which a first counterweight base (2) is placed. A main mounting vertical rod (3) is fixedly connected to the first counterweight base (2). On one side of the main mounting vertical rod (3), an extraction measuring cup (4), a separating funnel (5) and a collecting container (6) are arranged in sequence from top to bottom along the vertical direction; An ultrasonic cleaning rod (7) is inserted into the extraction measuring cup (4), and there is a gap between the lower end of the ultrasonic cleaning rod (7) and the bottom of the extraction measuring cup (4); the ultrasonic cleaning rod (7) is installed on a placement rack (9) through a clamp (8), and the placement rack (9) is placed on the working platform (1) on the side of the extraction measuring cup (4) away from the mounting vertical rod; A dosing hose (10) is connected to the collecting container (6), and one end of the dosing hose (10) away from the collecting container (6) is connected to the input end of a peristaltic pump (11).

2. The processing system for detecting the available silicon content in soil by the plasma spectroscopy device according to claim 1, wherein: On one side of the main mounting vertical rod (3) close to the placement rack (9), a first placement ring (12), a second placement ring (13) and a horizontal adjusting frame (14) are arranged in sequence from bottom to top along the vertical direction; The collecting container (6) is placed on the first placement ring (12), the separating funnel (5) is placed on the second placement ring (13), and the extraction measuring cup (4) is movably installed on the horizontal adjusting frame (14).

3. The processing system for detecting the available silicon content in soil by the plasma spectroscopy device according to claim 2, characterized in that: The horizontal adjusting frame (14) includes a U-shaped frame (141) horizontally arranged above the second placement ring (13). The middle position of the closed end of the U-shaped frame (141) is fixedly connected through a connecting rod (142) and a guiding column (143). The guiding column (143) is sleeved on the main mounting vertical rod (3) and they are coaxially arranged. A first adjusting bolt (144) is inserted on the side of the guiding column (143) away from the connecting column and they are threadedly connected; Two horizontal brackets (145) are symmetrically arranged inside the open end of the U-shaped frame (141); the mutually approaching ends of the two horizontal brackets (145) both extend upward along the vertical direction, and a placement groove (146) is arranged at the top of the upward extending section of the horizontal bracket (145); Two inverted L-shaped hanging rods (147) are symmetrically arranged at the upper port of the extraction measuring cup (4), and the horizontal sections of the two hanging rods (147) are respectively placed in the placement grooves (146) of the two horizontal brackets (145).

4. The processing system for detecting the available silicon content in soil by the plasma spectroscopy device according to any one of claims 1 to 3, characterized in that: The placement rack (9) includes a second counterweight base (91). A vertical fixing rod (92) is fixedly installed at the middle position on the upper side of the second counterweight base (91), and the clamp (8) is installed on the fixing rod (92).

5. The processing system for detecting the available silicon content in soil by the plasma spectroscopy device according to claim 4, characterized in that: The clamp (8) is a laboratory universal clamp. The rod part of the laboratory universal clamp away from its opening end is sleeved on the fixing rod (92) through a slider (15), and a second adjusting bolt (16) is inserted on the slider (15) and they are threadedly connected.

6. The processing system for detecting the available silicon content in soil by the plasma spectroscopy device according to any one of claims 1 to 3, characterized in that: One end of the dosing hose (10) away from the peristaltic pump (11) is installed at the bottom of the collecting container (6).

7. The processing system for detecting the available silicon content in soil by the plasma spectroscopy device according to claim 6, characterized in that: A socket (17) is fixedly connected to the lower side of the middle position of the bottom of the collection container (6). The socket (17) communicates with the internal space of the collection container (6). A rubber sealing plug (18) is fixedly installed in the socket (17). One end of the dispensing hose (10) far from the peristaltic pump (11) is fixedly connected with a plastic needle (19). The plastic needle (19) passes upward through the rubber sealing plug (18) and communicates with the internal space of the collection container (6).

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