Multi-channel switching extraction process spectral on-line monitoring device and method thereof

Abstract

The application discloses a multi-channel switching type extraction process spectrum online monitoring device and a method thereof, relates to the field of extraction monitoring, and the device comprises a supporting base, a control end is installed on the right side of the supporting base, a fixed vertical cylinder is fixedly connected to the top end of the supporting base, a rotating sleeve is arranged on the surface of the fixed vertical cylinder, a light source end is installed on the left side of the top end of the supporting base, a spectrometer main body is installed on the right side of the top end of the supporting base, and the emitting end of the light source end and the receiving end of the spectrometer main body are symmetrically installed on the surface of the fixed vertical cylinder. The colorimetric cup can automatically enter the spectrum detection area in turn, the spectrum detection unit can detect multiple colorimetric cups in turn, the hardware cost is greatly reduced, the system structure is simplified, the monitoring area is always in a clean public environment, direct contact with the extraction liquid and cross contamination problems caused by the direct contact are completely avoided.

Description

Technical Field

[0001] This invention relates to the field of extraction monitoring technology, specifically to a multi-channel switching online spectral monitoring device and method for extraction processes. Background Technology

[0002] Liquid-liquid extraction is a widely used separation and purification technology in pharmaceuticals, chemicals, food, and environmental protection. Monitoring of the extraction process is typically offline, involving taking samples from the reactor and sending them to the laboratory for analysis. This process is time-consuming, labor-intensive, and subject to time lags. To achieve precise control and optimization of the extraction process, the industry urgently needs technology capable of online real-time monitoring of changes in the concentration of the target component in the extraction system. Furthermore, in modern drug development and chemical process development, high-throughput experimental methods are frequently employed to improve research efficiency, involving the simultaneous execution of multiple parallel experiments.

[0003] Traditional online spectral monitoring typically uses only one set of spectral transmitter and receiver, allowing for the monitoring of only one reaction vessel. Monitoring multiple channels requires a separate spectrometer and probe for each channel, resulting in extremely high costs and cumbersome equipment. Frequent insertion and removal of a single spectral probe from different extraction vessels can easily lead to probe contamination and may carry samples from one channel to another, causing cross-contamination and severely impacting the accuracy of experimental results.

[0004] In extraction systems that are left to stand or are slowly stirred, the density difference between the oil and water phases can easily lead to stratification and inhomogeneity. If the spectral monitoring area happens to be a specific phase, such as the upper oil phase or the lower water phase, or if an inhomogeneous emulsion is detected, then the collected spectral data will not represent the true concentration of the entire system, resulting in data distortion. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a multi-channel switching online spectral monitoring device and method for extraction process, which can effectively solve the problems of the prior art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] In a first aspect, the present invention discloses a multi-channel switching extraction process spectral online monitoring device, comprising a support base, a control terminal installed on the right side of the support base, a fixed vertical cylinder fixedly connected to the top of the support base, a rotating sleeve sleeved on the surface of the fixed vertical cylinder, a light source end installed on the left side of the top of the support base, and a spectrometer body installed on the right side of the top of the support base. The emitting end of the light source end and the receiving end of the spectrometer body are symmetrically installed on the surface of the fixed vertical cylinder, and a spectral monitoring area is formed between the emitting end of the light source end and the receiving end of the spectrometer body; a motor is fixedly connected to the left side of the top of the support base.

[0010] Four cuvettes are evenly installed inside the fixed vertical cylinder. Each cuvette has an extraction storage tank at its top. A switching mechanism is installed inside the rotating sleeve. The switching mechanism includes a movable rod, a ball, and a support frame. The support frame is installed on the surface of the support base. The movable rods pass through the fixed vertical cylinder and are sleeved on the surface of the cuvettes. During startup, the motor drives the rotating sleeve to rotate, causing the ball to continuously trigger the resistance of the movable rods. This allows the movable rods to alternately move the corresponding cuvettes to the spectral monitoring area between the light source emitter and the spectrometer receiver to participate in the detection.

[0011] A swing mechanism is provided on the left side of the top of the fixed vertical cylinder. The swing mechanism includes a bevel gear one, a bevel gear two, and a fixed rod. The bevel gear one is sleeved on the top of the rotating sleeve. The bevel gear one and the bevel gear two are meshed. The bevel gear two drives the fixed rod to swing back and forth during the rotation of the rotating sleeve, thereby causing the extraction storage tank to intermittently homogenize the internal extract.

[0012] Furthermore, the upper and lower ends of the extraction storage tank are fixedly connected to bellows, and the upper and lower ends of the cuvette are both connected to flexible tubes via threads. A switch valve is installed at the end of each flexible tube away from the cuvette. The bottom end of the bellows at the lower end of the extraction storage tank is fixedly connected to the top end of the switch valve located on the upper side of the cuvette. The bottom end of the support base is connected to a sealing cap via threads. The flexible tube at the lower end of the cuvette extends through the sealing cap to the outside of the sealing cap.

[0013] Furthermore, the switching mechanism also includes a first transmission gear, which is fixedly connected to the top of the motor output shaft, and a second transmission gear is sleeved on the surface of the fixed cylinder, with the first transmission gear meshing with the second transmission gear.

[0014] Furthermore, each of the movable rods is fitted with a spring, one end of which is fixedly connected to the surface of the movable rod, and the other end of which is fixedly connected to the surface of the fixed cylinder. The ball block is fixedly connected to the inner wall of the rotating sleeve.

[0015] Furthermore, each of the movable rods has a fixed block slidably connected to one end of each rod that is close to the other, and a second spring is fixedly connected to the end of each fixed block that is far from the cuvette. The end of the second spring that is far from the fixed block is fixedly connected to the inner wall of the movable rod.

[0016] Furthermore, the central shaft of the second bevel gear passes through the support frame and is rotatably connected to the support frame. A central shaft is rotatably connected to the left end of the central shaft of the second bevel gear, and a connecting rod is rotatably connected to the left end of the central shaft. The left end of the connecting rod is rotatably connected to the left end of the support frame. A movable rod is rotatably connected to the top end of the central shaft, and a fixed rod is sleeved on the top end of the movable rod. A movable rod is fixedly connected to the inner wall of the bottom end of the fixed rod. The movable rod is slidably connected to the movable rod. A spring is sleeved on the surface of the movable rod. One end of the spring is fixedly connected to the surface of the movable rod, and the other end of the spring is fixedly connected to the inner wall of the movable rod.

[0017] Furthermore, a connecting frame is provided at the top of the rotating sleeve, and the connecting frame is fixedly connected to the four extraction storage tanks. A movable rod three is slidably connected to the bottom of the connecting frame, and the bottom of the movable rod three is fixedly connected to the top of the fixed vertical cylinder. A spring four is sleeved on the top of the movable rod three, one end of the spring four is fixedly connected to the surface of the movable rod three, and the other end of the spring four is fixedly connected to the inner wall of the connecting frame.

[0018] Secondly, this invention discloses a method for online spectral monitoring of a multi-channel switching extraction process, comprising the following steps:

[0019] Step 1: Symmetrically set the emitting end of the light source and the receiving end of the spectrometer body on the side wall of the fixed cylinder to create a fixed spectral monitoring area between the two.

[0020] Step 2: Evenly install multiple cuvettes containing the extracted samples inside the fixed vertical cylinder, and connect the top of each cuvette to an extraction storage tank;

[0021] Step 3: The rotational motion is converted into a cyclical, alternating contact drive for multiple movable rods by a switching mechanism; each movable rod is fitted over a cuvette and, when contacted, drives the corresponding cuvette to move laterally, so that it enters the spectral monitoring area in turn.

[0022] Step 4: When a cuvette is switched to the spectral monitoring area, the light source and the main body of the spectrometer are activated to collect online spectral data of the extraction process in the cuvette.

[0023] Step 5: During the rotation of the rotating sleeve, the rotational motion of the rotating sleeve is transmitted and converted into the reciprocating swing of the fixed rod by the swing mechanism set at the top of the fixed cylinder, which drives the extraction storage tank to intermittently homogenize the internal extract.

[0024] (III) Beneficial Effects

[0025] Compared with the known prior art, the technical solution provided by this invention has the following beneficial effects:

[0026] 1. By designing a switching mechanism and using a movable lever to continuously trigger the ball, the cuvettes can automatically take turns entering the spectral detection area. This allows a single expensive spectral detection unit to take turns detecting multiple cuvettes, greatly reducing hardware costs, simplifying the system structure, and ensuring that the monitoring area is always in a clean public environment, completely avoiding direct contact with the extraction liquid and the resulting cross-contamination problems.

[0027] 2. By setting up a swing mechanism, the extraction storage tank is synchronously driven to swing up and down during the switching of the movable rod, thereby causing the extraction liquid to be injected into the cuvette to oscillate up and down in a circular motion. This ensures that the liquid in the sample cell is homogeneous at the moment of spectral measurement, and ensures that the sample for each spectral detection is highly representative, thus guaranteeing the accuracy and reliability of the data. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0029] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0030] Figure 2 This is a frontal cross-sectional view of the present invention.

[0031] Figure 3 This is a top cross-sectional view of the rotating sleeve, fixed vertical cylinder, and spherical block in this invention.

[0032] Figure 4 This is a front view cross-sectional structural schematic diagram of the swing mechanism of the present invention;

[0033] Figure 5 This is a top cross-sectional view of the fixed vertical cylinder and cuvette in this invention.

[0034] Figure 6This is a schematic diagram of the overall three-dimensional structure of the present invention from another angle;

[0035] Figure 7 This is a three-dimensional structural diagram of the swing mechanism in this invention;

[0036] Figure 8 This is a schematic diagram of the overall three-dimensional structure of the supporting base and the fixed upright in this invention;

[0037] Figure 9 This is a schematic diagram of the overall three-dimensional structure of the supporting base and the fixed cylinder at another angle in this invention.

[0038] The labels in the diagram represent: 1. Support base; 2. Control end; 3. Rotating sleeve; 4. Fixed vertical cylinder; 5. Extraction storage tank; 6. Bellows; 7. Switch valve; 8. Hose; 9. Connecting frame; 10. Cuvette; 11. Sealing cap; 12. Movable rod; 13. Spring 1; 14. Ball block; 15. Fixed block; 16. Spring 2; 17. Bevel gear 1; 18. Bevel gear 2; 19. Connecting rod; 20. Central shaft; 21. Fixed rod; 22. Moving rod 1; 23. Moving rod 2; 24. Spring 3; 25. Motor; 26. Transmission gear 1; 27. Transmission gear 2; 28. Light source end; 29. ​​Spectrometer body; 30. Moving rod 3; 31. Spring 4; 32. Support frame. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] The present invention will be further described below with reference to embodiments.

[0041] The multi-channel switching extraction process online spectral monitoring device and method of this embodiment, such as Figures 1-9 As shown, the system includes a support base 1, a control terminal 2 mounted on the right side of the support base 1, a fixed vertical cylinder 4 fixedly connected to the top of the support base 1, a rotating sleeve 3 fitted on the surface of the fixed vertical cylinder 4, a light source end 28 mounted on the left side of the top of the support base 1, and a spectrometer body 29 mounted on the right side of the top of the support base 1. The emitting end of the light source end 28 and the receiving end of the spectrometer body 29 are symmetrically mounted on the surface of the fixed vertical cylinder 4, and a spectral monitoring area is formed between the emitting end of the light source end 28 and the receiving end of the spectrometer body 29. A motor 25 is fixedly connected to the left side of the top of the support base 1.

[0042] Four cuvettes 10 are evenly installed inside the fixed vertical cylinder 4. Each cuvette 10 has an extraction storage tank 5 at its top. Both the upper and lower ends of the extraction storage tank 5 are fixedly connected to a bellows 6. Both the upper and lower ends of the cuvette 10 are connected to a flexible tube 8 by a threaded rotation. The end of the flexible tube 8 away from the cuvette 10 is equipped with a switch valve 7. The bottom end of the bellows 6 at the lower end of the extraction storage tank 5 is fixedly connected to the top end of the switch valve 7 located on the upper side of the cuvette 10. The bottom end of the support base 1 is connected to a sealing cap 11 by a threaded rotation. The flexible tube 8 at the lower end of the cuvette 10 passes through the sealing cap 11 and extends to the outside of the sealing cap 11.

[0043] The rotating sleeve 3 is equipped with a switching mechanism, which includes a movable rod 12, a ball block 14 and a support frame 32. The support frame 32 is installed on the surface of the support base 1. The movable rod 12 passes through the fixed vertical cylinder 4 and is sleeved on the surface of the cuvette 10. During startup, the motor 25 drives the rotating sleeve 3 to rotate, so that the ball block 14 continuously triggers the action of resisting the movable rod 12, so that the movable rod 12 alternately drives the corresponding cuvette 10 to move to the spectral monitoring area between the light source end 28 and the spectrometer body 29 to participate in the detection. The surface of the movable rod 12 is sleeved with a spring 13. One end of the spring 13 is fixedly connected to the surface of the movable rod 12, and the other end of the spring 13 is fixedly connected to the surface of the fixed vertical cylinder 4. The ball block 14 is fixedly connected to the inner wall of the rotating sleeve 3.

[0044] Each of the movable rods 12 has a fixed block 15 slidably connected to one end of each other. Each of the fixed blocks 15 has a spring 16 fixedly connected to the other end of each fixed block 15 away from the cuvette 10. The other end of the spring 16 away from the fixed block 15 is fixedly connected to the inner wall of the movable rod 12. The cuvette 10 is temporarily fixed by the cooperation of the fixed block 15 and the spring 16.

[0045] The switching mechanism also includes a transmission gear 26, which is fixedly connected to the top of the output shaft of the motor 25. A transmission gear 27 is sleeved on the surface of the fixed cylinder 4, and the transmission gear 26 and the transmission gear 27 are meshed together.

[0046] Compared with existing technologies, this method can automatically and sequentially position the four cuvettes 10 precisely to a unique spectral monitoring area. A single spectral detection mechanism can be shared by the four cuvettes 10, achieving high-throughput monitoring. The automated rotation requires no manual intervention, ensuring the continuity and closed nature of the extraction process. It can capture instantaneous reaction state changes that may be missed by traditional methods, providing dynamic data support for optimizing the extraction process.

[0047] In other aspects, this embodiment provides a swinging mechanism, a design that effectively avoids sample inhomogeneity caused by solution stratification or particle sedimentation; such as Figure 4As shown, a swing mechanism is provided on the left side of the top of the fixed vertical cylinder 4. The swing mechanism includes a bevel gear 17, a bevel gear 28 and a fixed rod 21. The bevel gear 17 is sleeved on the top of the rotating sleeve 3. The bevel gear 17 and the bevel gear 28 are meshed and connected. The bevel gear 28 drives the fixed rod 21 to swing back and forth during the rotation of the rotating sleeve 3, thereby driving the extraction storage tank 5 to intermittently homogenize the internal extract.

[0048] A motor 25 is fixedly connected to the left side of the top of the rotating sleeve 3. The central shaft of the second bevel gear 18 passes through the support frame 32 and is rotatably connected to the support frame 32. The left end of the central shaft of the second bevel gear 18 is rotatably connected to the central shaft rod 20. The left end of the central shaft rod 20 is rotatably connected to the connecting rod 19. The left end of the connecting rod 19 is rotatably connected to the left end of the support frame 32. The top of the central shaft rod 20 is rotatably connected to the first moving rod 22. The top of the first moving rod 22 is fitted with a fixed rod 21. The inner wall of the bottom end of the fixed rod 21 is fixedly connected to the second moving rod 23. The second moving rod 23 is slidably connected to the first moving rod 22. The surface of the second moving rod 23 is fitted with a third spring 24. One end of the third spring 24 is fixedly connected to the surface of the second moving rod 23, and the other end of the third spring 24 is fixedly connected to the inner wall of the first moving rod 22.

[0049] like Figure 2 As shown, a connecting frame 9 is provided at the top of the rotating sleeve 3. The connecting frame 9 is fixedly connected to four extraction storage tanks 5. A moving rod 30 is slidably connected to the bottom of the connecting frame 9. The bottom of the moving rod 30 is fixedly connected to the top of the fixed vertical cylinder 4. A spring 4 31 is sleeved on the top of the moving rod 30. One end of the spring 4 31 is fixedly connected to the surface of the moving rod 30, and the other end of the spring 4 31 is fixedly connected to the inner wall of the connecting frame 9.

[0050] Compared with existing technologies, the extraction liquid is actively mechanically stirred during the switching of cuvette 10, and a forced homogenization operation is implemented to ensure that the liquid inside the reaction channel is fully mixed every time it is rotated to the monitoring point. Therefore, each spectral data point collected is a faithful reflection of the overall extraction state of the current channel, reducing data fluctuations and systematic errors caused by sample inhomogeneity.

[0051] This embodiment provides a method for online spectral monitoring of a multi-channel switching extraction process, including the following steps:

[0052] Step 1: Symmetrically arrange the emitting end of the light source end 28 and the receiving end of the spectrometer body 29 on the side wall of the fixed vertical cylinder 4 to construct a fixed spectral monitoring area between the two.

[0053] Step 2: Install multiple cuvettes 10 containing the extracted samples evenly inside the fixed vertical cylinder 4, and connect the top of each cuvette 10 to an extraction storage tank 5.

[0054] Step 3: The rotational motion is converted into a cyclical, alternating contact drive for multiple movable rods 12 by a switching mechanism; each movable rod 12 is fitted around a cuvette 10 and, when contacted, drives the corresponding cuvette 10 to move laterally, so that it enters the spectral monitoring area in turn.

[0055] Step 4: When a cuvette 10 is switched to the spectral monitoring area, the light source 28 and the spectrometer body 29 are activated to collect online spectral data of the extraction process in the cuvette 10.

[0056] Step 5: During the rotation of the rotating sleeve 3, the rotational motion of the rotating sleeve 3 is transmitted and converted into the reciprocating swing of the fixed rod 21 by the swing mechanism set at the top of the fixed vertical cylinder 4, which drives the extraction storage tank 5 to intermittently homogenize the internal extract.

[0057] Working principle: In the specific implementation of the monitoring device of the present invention, firstly, an external power supply is connected to each electrical device, and the start and stop of each electrical device is controlled by the control terminal 2. The corrugated pipe 6 at the top of the extraction storage tank 5 is connected to the extraction equipment to receive the extraction liquid and keep the switch valve 7 closed.

[0058] When monitoring begins, the top switch valve 7 is opened, allowing the extract temporarily stored in the extraction storage tank 5 to be injected into the cuvette 10 through the top hose 8. Once the preset liquid volume is reached, the top switch valve 7 is closed, and the motor 25 is started. The motor 25 drives the transmission gear 1 26 to rotate, which in turn drives the transmission gear 27 to rotate. The transmission gear 27 then drives the rotating sleeve 3 to rotate. The rotating sleeve 3 causes the ball block 14 to alternately abut against the movable rod 12, which in turn compresses the spring 13. This causes the movable rod 12 to move the cuvette 10 into the spectral monitoring area. The hose 8 is made of a soft material and can provide movement compensation for the cuvette 10. The emitting end of the light source 28 generates incident light onto the cuvette 10 within the spectral monitoring area, so that the transmitted light from the cuvette 10 is received by the receiving end of the spectrometer body 29, and the spectral data is transmitted to the control end 2 for analysis.

[0059] During the intermittent rotation of the rotating sleeve 3, it drives the first bevel gear 17 to rotate, which in turn drives the second bevel gear 18 to rotate. During this rotation, the second bevel gear 18, in conjunction with the connecting rod 19, ... Figure 4As shown, the bevel gear 18 and connecting rod 19 drive the central shaft 20 to rotate eccentrically, which in turn drives the moving rod 22 to move on the surface of the moving rod 23. The moving rod 23 moves inside the moving rod 22. During this process, the spring 34 is continuously stretched or compressed, so that the moving rod 22 drives the extraction storage tank 5 to move through the fixed rod 21. The moving rod 30 moves in the connecting frame 9 and continuously stretches or compresses the spring 41, so that the extraction storage tank 5 is in continuous oscillation. The bellows 6 provides movement compensation for the extraction storage tank 5 and is continuously compressed or stretched during the displacement of the extraction storage tank 5.

[0060] After the extraction solution in cuvette 10 has been tested, open the bottom valve 7 to allow the extraction solution to flow out through the bottom hose 8. When maintenance is required, the user can rotate the sealing cap 11 to remove it from the support base 1, rotate the bottom hose 8, and remove the hose 8 from the cuvette 10 by the action of the threads. Pull the cuvette 10 to remove it from the inside of the fixed cylinder 4 and the movable rod 12. Insert the newly replaced cuvette 10 back into the movable rod 12. The movable rod 12 abuts against the fixed block 15, causing the fixed block 15 to compress the second spring 16. Under the action of the spring 16's rebound force, the fixed block 15 fixes the cuvette 10.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An apparatus for on-line monitoring of a multi-pass switching extraction process spectrum, characterized in that, The system includes a support base (1), a control terminal (2) installed on the right side of the support base (1), a fixed vertical cylinder (4) fixedly connected to the top of the support base (1), a rotating sleeve (3) sleeved on the surface of the fixed vertical cylinder (4), a light source end (28) installed on the left side of the top of the support base (1), a spectrometer body (29) installed on the right side of the top of the support base (1), and a spectral monitoring area is formed between the emitting end of the light source end (28) and the receiving end of the spectrometer body (29); a motor (25) is fixedly connected to the left side of the top of the support base (1). The fixed vertical cylinder (4) has four cuvettes (10) evenly installed inside. Each cuvette (10) has an extraction storage tank (5) at its top. The rotating sleeve (3) has a switching mechanism installed inside. The switching mechanism includes a movable rod (12), a ball block (14), and a support frame (32). During startup, the motor (25) drives the rotating sleeve (3) to rotate, so that the ball block (14) continuously triggers the action of resisting the movable rod (12), so that the movable rod (12) takes turns moving the corresponding cuvette (10) to the spectral monitoring area between the emitting end of the light source end (28) and the receiving end of the spectrometer body (29) to participate in the detection. A swing mechanism is provided on the left side of the top of the fixed vertical cylinder (4). The swing mechanism includes a bevel gear one (17), a bevel gear two (18) and a fixed rod (21). The bevel gear one (17) is sleeved on the top of the rotating sleeve (3). The bevel gear one (17) and the bevel gear two (18) are meshed. The bevel gear two (18) drives the fixed rod (21) to swing back and forth during the rotation of the rotating sleeve (3), thereby driving the extraction storage tank (5) to intermittently homogenize the internal extract. The extraction storage tank (5) is fixedly connected to the upper and lower ends with corrugated pipes (6), and the cuvette (10) is connected to the upper and lower ends with hoses (8) by threaded rotation. The end of the hoses (8) away from the cuvette (10) is equipped with a switch valve (7). The bottom end of the corrugated pipe (6) at the lower end of the extraction storage tank (5) is fixedly connected to the top end of the switch valve (7) located on the upper side of the cuvette (10). The bottom end of the support base (1) is connected to a sealing cap (11) by threaded rotation. The hose (8) at the lower end of the cuvette (10) passes through the sealing cap (11) and extends to the outside of the sealing cap (11).

2. The multi-channel switching online spectral monitoring device for the extraction process according to claim 1, characterized in that, The emitting end of the light source (28) and the receiving end of the spectrometer body (29) are symmetrically installed on the surface of the fixed tube (4). The support frame (32) is installed on the surface of the support base (1). The movable rods (12) all pass through the fixed tube (4) and are sleeved on the surface of the cuvette (10).

3. The multi-channel switching online spectral monitoring device for the extraction process according to claim 1, characterized in that, The switching mechanism also includes a first transmission gear (26), which is fixedly connected to the top of the output shaft of the motor (25). A second transmission gear (27) is sleeved on the surface of the fixed cylinder (4), and the first transmission gear (26) and the second transmission gear (27) are meshed together.

4. The multi-channel switching online spectral monitoring device for the extraction process according to claim 1, characterized in that, Spring 1 (13) is fitted on the surface of each movable rod (12). One end of each spring 1 (13) is fixedly connected to the surface of the movable rod (12), and the other end of each spring 1 (13) is fixedly connected to the surface of the fixed cylinder (4). The ball block (14) is fixedly connected to the inner wall of the rotating sleeve (3).

5. The multi-channel switching online spectral monitoring device for the extraction process according to claim 1, characterized in that, The movable rods (12) are slidably connected to fixed blocks (15) at their close ends. The fixed blocks (15) are fixedly connected to springs (16) at their ends away from the cuvette (10). The ends of springs (16) away from the fixed blocks (15) are fixedly connected to the inner wall of the movable rods (12).

6. The multi-channel switching online spectral monitoring device for extraction process according to claim 1, characterized in that, The central shaft of the second bevel gear (18) passes through the support frame (32) and is rotatably connected to the support frame (32). The left end of the central shaft of the second bevel gear (18) is rotatably connected to the central shaft rod (20). The left end of the central shaft rod (20) is rotatably connected to the connecting rod (19). The left end of the connecting rod (19) is rotatably connected to the left end of the support frame (32). The top end of the central shaft rod (20) is rotatably connected to the first moving rod (22). The top end of the first moving rod (22) is fitted with a fixed rod (21). The inner wall of the bottom end of the fixed rod (21) is fixedly connected to the second moving rod (23). The second moving rod (23) is slidably connected to the first moving rod (22). The surface of the second moving rod (23) is fitted with a third spring (24). One end of the third spring (24) is fixedly connected to the surface of the second moving rod (23). The other end of the third spring (24) is fixedly connected to the inner wall of the first moving rod (22).

7. The multi-channel switching online spectral monitoring device for extraction process according to claim 1, characterized in that, The top of the rotating sleeve (3) is provided with a connecting frame (9), which is fixedly connected to the four extraction storage tanks (5). The bottom of the connecting frame (9) is slidably connected to a moving rod three (30), the bottom of the moving rod three (30) is fixedly connected to the top of the fixed vertical cylinder (4), and the top of the moving rod three (30) is fitted with a spring four (31). One end of the spring four (31) is fixedly connected to the surface of the moving rod three (30), and the other end of the spring four (31) is fixedly connected to the inner wall of the connecting frame (9).

8. A method for online spectral monitoring of a multi-channel switching extraction process, wherein the method is an implementation method based on the multi-channel switching extraction process online spectral monitoring device according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Symmetrically set the emitting end of the light source end (28) and the receiving end of the spectrometer body (29) on the side wall of the fixed vertical tube (4) to construct a fixed spectral monitoring area between the two. Step 2: Install multiple cuvettes (10) carrying the extracted samples evenly inside the fixed vertical cylinder (4), and connect the top of each cuvette (10) to an extraction storage tank (5). Step 3: The rotational motion is converted into a cyclical, alternating contact drive for multiple movable rods (12) by a switching mechanism; each movable rod (12) is fitted over a cuvette (10) and, when contacted, drives the corresponding cuvette (10) to move laterally, so that it enters the spectral monitoring area in turn; Step 4: When a cuvette (10) is switched to the spectral monitoring area, the light source end (28) and the spectrometer body (29) are activated to collect online spectral data of the extraction process in the cuvette (10); Step 5: During the rotation of the rotating sleeve (3), the rotational motion of the rotating sleeve (3) is transmitted and converted into the reciprocating swing of the fixed rod (21) by the swing mechanism set at the top of the fixed vertical cylinder (4), which drives the extraction storage tank (5) to intermittently homogenize the internal extract.

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