A variable diameter plunger rod device for positive pressure solid phase extraction column and its use method

Abstract

The present invention belongs to the technical field of testing devices, and particularly relates to a variable-diameter plunger rod device for a positive-pressure solid-phase extraction column and its use method. The device comprises a fluororubber hollow oblate sphere, with flexible pressure sensors evenly distributed along the major diameter circumference of the fluororubber hollow oblate sphere. A miniature AI image recognition sensor is embedded in the lower end, and the upper end is fixed to the lower surface of a disc. A miniature direct-connected servo electric cylinder is fixed to the upper surface of the disc. The end of the electric cylinder's telescopic shaft is fixed to the lower end of the fluororubber hollow oblate sphere. A tapered hole body and a high-magnetic permanent magnet are mounted on the top of the electric cylinder, thereby forming a "variable-diameter plunger rod." The present invention can accommodate extraction columns of varying specifications, solving the problem of decreased detection efficiency and quality caused by frequent plunger rod replacement in the past. It eliminates the "back-draw" phenomenon of the plunger rod, makes disassembly and cleaning of the variable-diameter plunger rod more convenient, and significantly improves detection efficiency and quality.

Description

Technical Field

[0001] The invention belongs to the technical field of testing devices, and in particular relates to a variable diameter plunger rod device for a positive pressure solid phase extraction column and a use method thereof. Background Art

[0002] Solid-phase extraction (SPE) is a sample pretreatment process that uses a solid adsorbent to adsorb the target compound in a liquid sample, separating it from the sample matrix and interfering compounds. The target compound is then eluted with an eluent or desorbed by heating to isolate and enrich it. SPE apparatuses are divided into positive-pressure and negative-pressure types. Positive-pressure SPE apparatuses use air as a power source to pass through the SPE column, while negative-pressure SPE apparatuses use vacuum pressure to pass through the column. SPE columns are typically syringe-shaped polypropylene tubes with an adsorbent sieve plate at the bottom. The upper end of the SPE column is open, and the liquid passes through the adsorbent and is discharged from the lower outlet of the column. In positive-pressure SPE, a plunger is inserted vertically into the extraction column, and positive air pressure is used to force the liquid through the adsorbent sieve plate and out the lower outlet of the column. Different sample preparations require different extraction column specifications, necessitating frequent replacement of the plunger in the positive-pressure SPE apparatus to match the extraction column. Replacing the plunger rod is time-consuming and cumbersome. At the same time, the plunger rod sometimes needs to be refilled with relevant reagents in the extraction column. At this time, the plunger rod needs to be removed. When the plunger rod is moved upward, a "negative pressure backdraft phenomenon" will be formed on the liquid in the extraction column. These all seriously affect the detection efficiency and quality. There is currently no suitable solution device or method in the industry.

[0003] Purpose of the Invention

[0004] In order to make up for the shortcomings of existing technologies, a variable diameter plunger rod device for positive pressure solid phase extraction columns is provided, which can be matched with almost all specifications of extraction columns without replacing the plunger rod. At the same time, there will be no "backdraw" phenomenon. The variable diameter plunger rod is easy to disassemble and clean, thereby improving the detection efficiency and quality. Summary of the Invention

[0005] A variable diameter plunger rod device for a positive pressure solid phase extraction column, comprising a fluororubber hollow oblate spheroid, wherein the upper end of the fluororubber hollow oblate spheroid is fixed to the lower surface of a circular plate, a hole is provided in the center of the circular plate, a telescopic shaft is inserted into the hole, and the lower end of the telescopic shaft is fixed to the lower end of the fluororubber hollow oblate spheroid;

[0006] The telescopic shaft is the shaft of a micro direct-connected servo electric cylinder, and the micro direct-connected servo electric cylinder is vertically fixed to the upper surface of the circular plate by bolts;

[0007] The upper end of the miniature direct-connected servo electric cylinder is connected to the flange A by bolts. The upper surface of the flange A is fixed with a tapered hole body. A high-magnetic permanent magnet B is fixed in the center of the lower end of the tapered hole body by an annular pressure plate B. The tapered hole body and the components connected below constitute a "variable diameter plunger rod";

[0008] A high-magnetic permanent magnet A is provided above the high-magnetic permanent magnet B. The high-magnetic permanent magnet A is fixed to the lower surface of the frustum through an annular pressure plate A.

[0009] The upper end of the frustum is fixed with a flange B, which is connected to the plunger rod transmission part of the extractor through bolts.

[0010] Based on the above scheme, preferably, four flexible pressure sensors are evenly distributed and embedded on the large diameter circumference of the fluororubber cavity oblate sphere, a micro AI image recognition sensor is embedded in the center of the lower end of the fluororubber cavity oblate sphere, and a transparent Teflon coating is provided on the surface of the flexible pressure sensor and the micro AI image recognition sensor.

[0011] On the basis of the above scheme, preferably, two spring telescopic needle contact connectors are installed on the conical surface of the truncated cone, the convex head of the spring telescopic needle contact connector can contact the concave contact installed on the conical hole body, the wire connecting the concave contact is connected to the miniature direct-connected servo electric cylinder, and the wire connecting the spring telescopic needle contact connector is connected to the extractor transformer power supply control system.

[0012] On the basis of the above solution, preferably, an arrow is provided on the major diameter of the outer surface of the truncated cone, and an LED light is provided on the major diameter of the outer surface of the tapered hole.

[0013] On the basis of the above scheme, preferably, the LED lamp, miniature direct-connected servo electric cylinder, flexible pressure sensor, miniature AI image recognition sensor, and electrical control wires of the extractor are all connected to the display PLC controller by wire or wirelessly.

[0014] On the basis of the above scheme, preferably, the frustum and the conical hole body have the same taper. In order to ensure the close contact and fit of the conical curved surfaces between the frustum and the conical hole body, an attractive gap is provided between the high-magnetic permanent magnet A and the high-magnetic permanent magnet B (15) with opposite polarities.

[0015] The present invention also provides a method for using the variable diameter plunger rod device for the positive pressure solid phase extraction column, comprising the following steps:

[0016] S1. Press the work preparation button in the PLC controller, and all electronic control components enter the working state. Install the "reducing plunger rod" on the plunger rod transmission part of the extractor, that is, the high-magnetic permanent magnet A and the high-magnetic permanent magnet B attract each other and make the LED light on. The outer diameter of the fluororubber cavity oblate sphere in the "reducing plunger rod" is normally in the minimum diameter state, that is, the horizontal diameter of the middle part of the fluororubber cavity oblate sphere is in the minimum state, and its vertical height is in the maximum state;

[0017] S2. Press the work start button in the PLC controller. The PLC controller controls the vertical downward movement of the extractor's plunger rod transmission part based on the image data provided by the micro AI image recognition sensor. When the fluororubber cavity oblate sphere in the "variable diameter plunger rod" enters the extraction column, the PLC controller controls the vertical downward movement speed of the extractor's plunger rod transmission part to slow down according to the programmed setting requirements. At the same time, the PLC controller controls the micro direct-connected servo electric cylinder to work, shorten the telescopic shaft, and reduce the height dimension of the fluororubber cavity oblate sphere while increasing the horizontal diameter dimension. When the pressure value transmitted to the PLC controller by the four flexible pressure sensors evenly distributed on the circumference of the large diameter of the fluororubber cavity oblate sphere reaches the programmed setting range, the PLC controller controls the micro direct-connected servo electric cylinder to stop working. At this time, the horizontal large diameter of the fluororubber cavity oblate sphere seals the extraction column.

[0018] S3. When the fluororubber cavity oblate sphere seals the inner wall of the extraction column and continues to move downward, compressed air is formed between the lower surface of the fluororubber cavity oblate sphere and the liquid surface. The compressed air pushes the liquid surface downward, causing the liquid to fall steadily and gradually from the outlet through the adsorbent filler sieve plate;

[0019] S4. When the image data transmitted by the micro AI image recognition sensor to the PLC controller shows that the lower surface of the fluororubber cavity oblate sphere is about to reach the upper surface of the adsorbent filler sieve plate, the PLC controller controls the extractor's plunger rod transmission part to stop moving downward, and controls the micro direct-connected servo electric cylinder to operate and extend the telescopic shaft, so that the horizontal major diameter of the fluororubber cavity oblate sphere decreases and the height direction increases. The pressure values ​​of the four flexible pressure sensors evenly distributed on the fluororubber cavity oblate sphere drop to zero, and the PLC controller controls the micro direct-connected servo electric cylinder to stop working, and the extractor's plunger rod transmission part moves vertically upward to the pre-start position;

[0020] S5. When the fluororubber cavity oblate sphere is moved out of the extraction column or the reagent is injected into the extraction column again, the PLC controller controls the extractor plunger rod transmission part to stop moving downward, and controls the micro direct-connected servo electric cylinder to work and the telescopic shaft to extend, so that the horizontal major diameter of the fluororubber cavity oblate sphere becomes smaller and the height direction becomes larger, and the pressure values ​​of the four flexible pressure sensors evenly distributed on the fluororubber cavity oblate sphere drop to zero.

[0021] The beneficial technical effects of the present invention are as follows: the variable diameter plunger rod device for the positive pressure solid phase extraction column is adaptable to extraction columns of different specifications, solving the problem of decreased detection efficiency and quality caused by frequent replacement of plunger rods in the past. The variable diameter plunger rod eliminates the "back-draw" phenomenon, making it more convenient to disassemble and clean the variable diameter plunger rod, thereby significantly improving detection efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The structural features and usage of the present invention are further described with reference to the accompanying drawings:

[0023] Figure 1 It is a main sectional view of the present invention;

[0024] Figure 2 yes Figure 1 An enlarged view of part I;

[0025] Figure 3 It is a detached state diagram of the present invention;

[0026] Figure 4 It is a detailed diagram of the use process of the present invention;

[0027] Figure 5 It is the control principle diagram of the present invention;

[0028] In the figure: 1. Fluororubber hollow oblate sphere, 2. Telescopic shaft, 3. Flexible pressure sensor, 4. Circular plate, 5. Miniature direct-connected servo electric cylinder, 6. Flange A, 7. Conical body, 8. Wire, 9. Spring telescopic needle contact connector, 10. Flange B, 11. Cone, 12. High-magnetic permanent magnet A, 13. Annular pressure plate A, 14. Annular pressure plate B, 15. High-magnetic permanent magnet B, 16. Display PLC controller, 17. Miniature AI image recognition sensor, 18. Gap, 19. LED light, 20. Protrusion, 21. Arrow, 22. Extraction column, 23. Adsorbent filler sieve plate. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0031] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0032] Explanation of terms: The terms "install", "connect", "connect", "fix" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] See also Figure 1-5 A variable diameter plunger rod device for a positive pressure solid phase extraction column is mainly composed of: a fluororubber hollow oblate sphere 1, a flexible pressure sensor 3, a miniature direct-connected servo electric cylinder 5, a miniature AI image recognition sensor 17, a tapered hole body 7 and a high-magnetic permanent magnet and a frustum 11 connecting device, a display PLC controller 16, etc. The specific structure is: four flexible pressure sensors 3 are evenly distributed and embedded on the large diameter circumference of the flexible fluororubber hollow oblate sphere 1, and a miniature AI image recognition sensor 17 is embedded in the center of the outer lower end of the fluororubber hollow oblate sphere 1. A transparent Teflon coating is provided on the surface of the flexible pressure sensor 3 and the miniature AI image recognition sensor 17.

[0034] The upper end of the fluororubber hollow oblate sphere 1 is fixed to the lower surface of the circular plate 4. The circular plate 4 has a hole in its center, into which a telescopic shaft 2 is inserted. The lower end of the telescopic shaft 2 is fixed to the lower end of the fluororubber hollow oblate sphere 1. The telescopic shaft 2 serves as the shaft of a micro-direct-connected servo electric cylinder 5, which is vertically fixed to the upper surface of the circular plate 4 by bolts. The upper end of the micro-direct-connected servo electric cylinder 5 is bolted to a flange A6. The upper surface of flange A6 is fixed to a conical body 7. A high-magnetic permanent magnet B15 is fixed to the center of the lower end of the conical body 7 via an annular pressure plate B14. A high-magnetic permanent magnet A12 is located above high-magnetic permanent magnet B15 and is fixed to the lower surface of the truncated cone 11 via an annular pressure plate A13. The upper end of the truncated cone 11 is fixed to a flange B10, which is bolted to the vertical movement device of the plunger rod on the extractor.

[0035] The cone 11 and the conical body 7 have the same taper. To ensure a close contact between the cone surfaces of the cone 11 and the conical body 7, a very small attraction gap 18 is provided between the high-magnetic permanent magnets A12 and B15 with opposite polarities. Figure 2 , thereby ensuring that the curved surface contact between the truncated cone 11 and the tapered hole body 7 is dense.

[0036] The tapered hole body 7 and the parts connected to the bottom constitute the "variable diameter plunger rod". The high-magnetic permanent magnet A12 and the high-magnetic permanent magnet B15 realize the connection between the "variable diameter plunger rod" and the plunger rod vertical moving device on the extractor. The good fit between the tapered surface of the tapered hole body 7 and the frustum 11 ensures the vertical concentric positioning of the "variable diameter plunger rod" and also realizes the purpose of convenient disassembly, assembly and cleaning of the "variable diameter plunger rod". See the attached Figure 3 .

[0037] Two spring telescopic needle contact connectors 9 are installed on the conical surface of the truncated cone 11. The convex head 20 of the spring telescopic needle contact connector 9 can contact the concave contact installed on the conical hole body 7. The wire 8 connecting the concave contact is connected to the miniature direct-connected servo electric cylinder 5, and the wire 8 connecting the spring telescopic needle contact connector 9 is connected to the extractor transformer power supply control system.

[0038] An arrow 21 is provided on the outer major diameter of the cone 11, and an LED light 19 is provided on the outer major diameter of the cone body 7. During installation, hold the "reducing plunger rod" so that the high-magnetic permanent magnet B15 in the cone body 7 approaches the high-magnetic permanent magnet A12 at the lower end of the cone 11 vertically from bottom to top. When magnetic attraction is generated, the "reducing plunger rod" can be rotated horizontally so that the LED light 19 on the cone body 7 is aligned with the arrow 21 on the cone 11. At this time, the convex heads 20 of the two spring-loaded retractable pin contact connectors 9 on the curved surface of the cone 11 contact the concave contacts on the cone body 7. If there is electricity, the LED light 19 will light up, indicating that the installation is correct. See attached. Figures 1 to 4 .

[0039] The circular plate 4, flange A6, tapered hole body 7, flange B10, frustum 11, annular pressing plate A13, annular pressing plate B14, etc. are all made of polytetrafluoroethylene plastic non-metallic material.

[0040] The high-magnetic permanent magnets B15 and A12 can also be replaced with electromagnets. However, the disadvantage of using electromagnets is that when the power is off, the entire "variable plunger rod" will fall, which is detrimental to its protection and storage. The "variable plunger rod" is primarily subject to a vertical unidirectional force, that is, a vertical resistance during downward movement. During the return upward movement, the magnets are only subject to the self-weight of the "variable plunger rod." Therefore, the magnetic attraction between the high-magnetic permanent magnets B15 and A12 does not need to be excessively strong.

[0041] The LED lamp 19, the miniature direct-connected servo electric cylinder 5, the flexible pressure sensor 3, the miniature AI image recognition sensor 17, the extractor and other electrical control wires 8 are all connected to the display PLC controller 16 by wire or wireless, and the control program of each electrical component and the self-learning adaptive program are input into the display PLC controller 16. The contact pressure range value between the flexible pressure sensor 3 and the inner wall of the extraction column 22 is programmed and set, and the PLC controller controls the vertical movement distance and return stroke of the fluororubber cavity oblate sphere 1 based on the image data transmitted by the AI ​​image recognition sensor and the transmission data of the extractor plunger rod.

[0042] The method of using the present invention is as follows: press the work preparation button in the display PLC controller 16, and each electronic control component enters the working state, and each "variable diameter plunger rod" is installed on the transmission end of the plunger rod of the extractor, that is, the high magnetic permanent magnet A12 and the high magnetic permanent magnet B15 attract each other and make the LED light 19 light up. The outer diameter of the fluororubber cavity oblate spheroid 1 in the "variable diameter plunger rod" is normally in the minimum diameter state, that is, the middle horizontal diameter of the fluororubber cavity oblate spheroid 1 is in the minimum state and its vertical height is in the maximum state. Press the work start button in the display PLC controller 16, and the PLC controller controls the vertical downward movement of the extractor plunger rod transmission part according to the image data provided by the micro AI image recognition sensor 17. When the fluororubber cavity oblate spheroid 1 in the "variable diameter plunger rod" enters the extraction column 22 (see attached) Figure 4 After Figure b, the PLC controller controls the vertical downward speed of the piston rod transmission part of the extractor to slow down in accordance with the programming requirements. At the same time, the PLC controller controls the micro direct-connected servo electric cylinder 5 to work, the telescopic shaft 2 to shorten, the height direction dimension of the fluororubber cavity oblate sphere 1 to become smaller and the horizontal diameter direction to become larger. When the pressure value transmitted to the PLC controller by the four flexible pressure sensors 3 evenly distributed on the large diameter circumference of the fluororubber cavity oblate sphere 1 reaches the programmed setting range, the PLC controller controls the micro direct-connected servo electric cylinder 5 to stop working. At this time, the horizontal large diameter of the fluororubber cavity oblate sphere 1 seals the extraction column 22. The fluororubber cavity oblate sphere 1 seals the inner wall of the extraction column 22 and continues to move downward. Compressed air is formed between the lower surface of the fluororubber cavity oblate sphere 1 and the liquid surface. The compressed air pushes the liquid surface downward, causing the liquid to fall steadily and successively from the outlet through the adsorbent filler sieve plate 23. See attached. Figure 4 Figure c and Figure d. When the image data transmitted by the micro AI image recognition sensor 17 to the PLC controller shows that the lower surface of the fluororubber cavity oblate spheroid 1 is about to reach the upper surface of the adsorbent filler sieve plate 23 or when the fluororubber cavity oblate spheroid 1 is about to be removed from the extraction column 22 and the reagent is re-injected into the extraction column 22, the PLC controller controls the transmission part of the plunger rod of the extractor to stop moving downward, see the attached Figure 4Figure e) controls the micro direct-connected servo electric cylinder 5 to work and the telescopic shaft 2 to extend, so that the horizontal major diameter of the fluororubber cavity oblate sphere 1 becomes smaller and the height direction becomes larger. The pressure values ​​of the four flexible pressure sensors 3 evenly distributed on the fluororubber cavity oblate sphere 1 drop to zero, and the PLC controller controls the micro direct-connected servo electric cylinder 5 to stop working. See attached. Figure 4 Figure f, the control extractor plunger rod transmission part moves vertically upward to the pre-start position. When the fluororubber cavity oblate sphere 1 moves upward, its horizontal major diameter does not contact the inner wall of the extraction column 22, so there is no back-drawing. See attached Figure 4 Middle picture g.

[0043] The device is adaptable to extraction columns 22 of different specifications, solving the problem of decreased detection efficiency and quality caused by frequent replacement of plunger rods in the past. The variable diameter plunger rod eliminates the "back-draw" phenomenon, making disassembly and cleaning of the variable diameter plunger rod more convenient, significantly improving detection efficiency and quality.

[0044] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A variable diameter plunger rod device for a positive pressure solid phase extraction column, characterized in that: It comprises a fluororubber hollow oblate sphere (1), the upper end of the fluororubber hollow oblate sphere (1) is fixed to the lower surface of a circular plate (4), a hole is provided at the center of the circular plate (4), a telescopic shaft (2) is inserted into the hole, and the lower end of the telescopic shaft (2) is fixed to the lower end of the fluororubber hollow oblate sphere (1); The telescopic shaft (2) is the shaft of a micro direct-connected servo electric cylinder (5), and the micro direct-connected servo electric cylinder (5) is vertically fixed to the upper surface of the circular plate (4) by bolts; The upper end of the micro direct-connected servo electric cylinder (5) is connected to the flange A (6) by bolts, the upper surface of the flange A (6) is fixed with a tapered hole body (7), and a high-magnetic permanent magnet B (15) is fixed at the center of the lower end of the tapered hole body (7) through an annular pressure plate B (14), and the tapered hole body (7) and the components connected thereto form a "variable diameter plunger rod"; A high-magnetic permanent magnet A (12) is provided above the high-magnetic permanent magnet B (15). The high-magnetic permanent magnet A (12) is fixed to the lower surface of the frustum (11) through an annular pressure plate A (13). The upper end of the frustum (11) is fixed with a flange B (10), and the flange B (10) is connected to the transmission part of the plunger rod of the extractor through bolts; Four flexible pressure sensors (3) are evenly distributed and embedded on the large diameter circumference of the fluororubber cavity oblate sphere (1), a micro AI image recognition sensor (17) is embedded in the center of the outer lower end of the fluororubber cavity oblate sphere (1), and a transparent Teflon coating is provided on the surface of the flexible pressure sensor (3) and the micro AI image recognition sensor (17); Two spring telescopic needle contact connectors (9) are installed on the conical surface of the truncated cone (11), and the convex head (20) of the spring telescopic needle contact connector (9) can contact the concave contact installed on the conical hole body (7). The wire (8) connecting the concave contact is connected to the micro direct-connected servo electric cylinder (5), and the wire (8) connecting the spring telescopic needle contact connector (9) is connected to the transformer power supply control system of the extractor; An arrow (21) is provided on the major diameter of the outer surface of the truncated cone (11), and an LED light (19) is provided on the major diameter of the outer surface of the cone body (7); The frustum (11) and the conical hole body (7) have the same fitting taper. To ensure that the conical surfaces between the frustum (11) and the conical hole body (7) are in close contact with each other, an attractive gap (18) is provided between the high-magnetic permanent magnet A (12) and the high-magnetic permanent magnet B (15) with opposite polarities.

2. The variable diameter plunger rod device for a positive pressure solid phase extraction column according to claim 1, characterized in that: The LED lamp (19), the micro direct-connected servo electric cylinder (5), the flexible pressure sensor (3), the micro AI image recognition sensor (17), and the electric control wire (8) of the extractor are all connected to the display PLC controller (16) by wire or wirelessly.

3. A method for using the variable diameter plunger rod device for a positive pressure solid phase extraction column according to claim 2, comprising the following steps: S1. Press the work preparation button in the display PLC controller (16), and each electronic control component enters the working state. The "variable diameter plunger rod" is installed in the plunger rod transmission part of the extractor, that is, the high magnetic permanent magnet A (12) and the high magnetic permanent magnet B (15) attract each other and make the LED light (19) light up. The outer diameter of the fluororubber cavity oblate sphere (1) in the "variable diameter plunger rod" is in the minimum diameter state under normal conditions, that is, the horizontal diameter of the middle part of the fluororubber cavity oblate sphere (1) is in the minimum state and its vertical height is in the maximum state; S2. Press the work start button in the display PLC controller (16). The display PLC controller (16) controls the vertical downward movement of the extraction instrument plunger rod transmission part according to the image data provided by the micro AI image recognition sensor (17). When the fluororubber cavity oblate sphere (1) in the "variable plunger rod" enters the extraction column (22), the display PLC controller (16) controls the vertical downward movement speed of the extraction instrument plunger rod transmission part to slow down according to the programming setting requirements. At the same time, the display PLC controller (16) controls the micro direct-connection The servo electric cylinder (5) works, the telescopic shaft (2) shortens, the height dimension of the fluororubber cavity oblate sphere (1) decreases and the horizontal diameter dimension increases. When the pressure value transmitted by the four flexible pressure sensors (3) evenly distributed on the large diameter circumference of the fluororubber cavity oblate sphere (1) to the display PLC controller (16) reaches the programmed setting range, the display PLC controller (16) controls the micro direct-connected servo electric cylinder (5) to stop working. At this time, the horizontal large diameter of the fluororubber cavity oblate sphere (1) achieves sealing on the extraction column (22); S3. When the fluororubber cavity oblate sphere (1) seals the inner wall of the extraction column (22) and continues to move downward, compressed air is formed between the lower surface of the fluororubber cavity oblate sphere (1) and the liquid surface. The compressed air pushes the liquid surface downward, causing the liquid to fall steadily and continuously from the outlet through the adsorbent filler sieve plate (23); S4. When the image data transmitted by the micro AI image recognition sensor (17) to the display PLC controller (16) shows that the lower surface of the fluororubber cavity oblate sphere (1) is about to reach the upper surface of the adsorbent filler sieve plate (23), the display PLC controller (16) controls the extractor plunger rod transmission part to stop moving downward, and controls the micro direct-connected servo electric cylinder (5) to work and the telescopic shaft (2) to extend, so that the horizontal major diameter of the fluororubber cavity oblate sphere (1) becomes smaller and the height direction becomes larger, the pressure values ​​of the four flexible pressure sensors (3) evenly distributed on the fluororubber cavity oblate sphere (1) drop to zero, the display PLC controller (16) controls the micro direct-connected servo electric cylinder (5) to stop working, and the extractor plunger rod transmission part moves vertically upward to the position before starting; S5. When the fluororubber cavity oblate sphere (1) is moved out of the extraction column (22) or the reagent is injected into the extraction column (22), the PLC controller (16) controls the plunger rod transmission part of the extractor to stop moving downward, and controls the micro direct-connected servo electric cylinder (5) to work and the telescopic shaft (2) to extend, so that the horizontal major diameter of the fluororubber cavity oblate sphere (1) becomes smaller and the height direction becomes larger, and the pressure values ​​of the four flexible pressure sensors (3) evenly distributed on the fluororubber cavity oblate sphere (1) drop to zero.

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