A fully automatic liquid-liquid extraction device

Abstract

The present invention discloses a fully automatic liquid-liquid extraction device, which belongs to the technical field of water body analysis equipment, including a multi-position sampler, a mechanical arm is fixedly connected to one side of the multi-position sampler, an operating mechanism is arranged at the end of the mechanical arm, a plurality of extraction cups are arranged on the multi-position sampler, the operating mechanism is connected to the extraction cup, a waste liquid position storage device is arranged on the side of the multi-position sampler away from the mechanical arm, the operating mechanism is respectively connected to a PH adjustment mechanism, an extraction mechanism and a storage mechanism, and a control system is arranged outside the multi-position sampler, and the control system is respectively electrically connected to the operating mechanism, the PH adjustment mechanism and the extraction mechanism. A water sample to be tested is placed in the extraction cup, and parameter information required for the test is input into the control system. According to the parameter information set on the control system, the mechanical arm is placed above the extraction cup, and the test is started through the operating mechanism. The PH adjustment mechanism is used to adjust the PH value of the water sample to be tested in the extraction cup, and the extraction mechanism is used for extraction. The extracted extractant is placed in the storage mechanism for storage.

Description

Technical Field

[0001] The invention relates to the technical field of water body analysis equipment, and in particular to a fully automatic liquid-liquid extraction device. Background Art

[0002] Water is the source of life. my country has abundant water resources, ranking fourth in the world in total, but the per capita water resources are relatively low. Water is closely related to our daily life, so daily monitoring and treatment of our precious water resources is an indispensable part of the work in the process of modernization.

[0003] At present, there are more than 100 daily water quality monitoring projects in relevant functional departments in my country, and the projects measured by spectrophotometry account for the vast majority. However, for various reasons, most of the substances to be tested cannot be directly measured using a spectrophotometer. Some kind of extractant must be used to extract the substances to be tested from the water. By measuring the concentration in the extract, the content and concentration of the substance in the monitored water can be obtained.

[0004] At present, in water quality testing projects, the extraction agents used in the subsequent measurement work are mostly volatile organic reagents that are toxic to the human body. The traditional manual shaking extraction process requires personnel to shake the heavy separatory funnel filled with liquid for a period of time, which is very laborious. In addition, because the water body and the extractant have relative motion, the internal energy of the extractant increases, which increases its volatilization rate. During this period, the knob of the separatory funnel needs to be opened for deflation. The released gas is the volatile organic reagent. For the testers, long-term operation will seriously affect their health.

[0005] In order to solve the troubles caused by the above extraction process, people invented a liquid-liquid extractor. However, the liquid-liquid extractors currently on the market can only extract the water body to be tested. That is, the water body to be tested requires the experimenter to manually measure the extraction reagent, manually add the extraction reagent to the water body to be tested, and then the liquid-liquid extractor performs the extraction process. After the extraction, the extractant is still in the extraction bottle and has not been separated. The extraction agent needs to be manually separated before the measurement can be achieved.

[0006] For some special projects, it is necessary to adjust the pH of the water before extracting it; for some special projects, it is necessary to extract the water multiple times; for some special projects, it is necessary to add sodium chloride solution before extracting the water; for some units with strict quality control, when doing water testing, it is necessary to add a certain amount of standard liquid to the water before extraction, and calculate the recovery rate of the spiked solution to determine whether there are problems in the operation process. The functions required for the above special projects are not available in the liquid-liquid extractors on the market, and the liquid-liquid extractors on the market cannot realize the automation of the entire process from adding various reagents, extraction or multiple extractions, and separation. Summary of the invention

[0007] The purpose of the present invention is to provide a fully automatic liquid-liquid extraction device to solve the problems existing in the prior art.

[0008] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a fully automatic liquid-liquid extraction device, including a multi-position sampler, a robotic arm is fixedly connected to one side of the multi-position sampler, an operating mechanism is provided at the end of the robotic arm, a plurality of extraction cups are provided on the multi-position sampler, the operating mechanism is connected with the extraction cups, a waste liquid storage device is provided on the side of the multi-position sampler away from the robotic arm, the operating mechanism is respectively connected with a pH adjustment mechanism, an extraction mechanism and a storage mechanism, a control system is externally provided to the multi-position sampler, and the control system is respectively electrically connected with the operating mechanism, the pH adjustment mechanism and the extraction mechanism.

[0009] Preferably, the operating mechanism includes a PH electrode, a stirrer, and an ultrasonic radar respectively fixed to the ends of the robotic arm, the PH electrode, the stirrer, and the ultrasonic radar are respectively adapted to the extraction cup, and the PH electrode, the stirrer, and the ultrasonic radar are respectively electrically connected to the control system.

[0010] Preferably, the pH adjustment mechanism includes a first peristaltic pump, which is provided with a first BPT tube, one end of the first BPT tube is connected to the extraction cup, the other end of the first BPT tube is connected to a first three-way valve, one end of the first three-way valve away from the first BPT tube is connected to a second three-way valve, the other end of the first three-way valve away from the first BPT tube is connected to a sodium chloride solution, two ends of the second three-way valve away from the first three-way valve are respectively connected to an acidic solution and an alkaline solution, and the first three-way valve and the second three-way valve are respectively electrically connected to the control system.

[0011] Preferably, the storage mechanism comprises a second peristaltic pump, the second peristaltic pump is provided with a second BPT tube, one end of the second BPT tube is connected to the extraction cup, and the other end of the second BPT tube is connected to the storage unit.

[0012] Preferably, the storage part includes a storage pipe rack, a plurality of storage pipes are provided on the storage pipe rack, a multi-channel valve is provided on the top of the storage pipe, the multi-channel valve is respectively connected to the plurality of storage pipes, and the multi-channel valve is connected to the other end of the second BPT pipe.

[0013] Preferably, the extraction mechanism includes a third peristaltic pump, the third peristaltic pump is connected to a third three-way valve, the third three-way valve is connected to the extraction cup away from the bottom of the third peristaltic pump, the third three-way valve is connected to a fourth three-way valve away from the top of the third peristaltic pump, the two ends of the fourth three-way valve away from the third three-way valve are respectively connected to extraction reagent and standard solution, and the third three-way valve and the fourth three-way valve are respectively electrically connected to the control system.

[0014] The present invention discloses the following technical effects: a water sample to be tested is placed in an extraction cup, parameter information required for the test is input into a control system, a mechanical arm is placed above the extraction cup according to the parameter information set on the control system, the test is started through an operating mechanism, a pH adjustment mechanism is used to adjust the pH value of the water sample to be tested in the extraction cup, an extraction mechanism is used for extraction, and the extracted extractant is placed in a storage mechanism for storage. The present invention can realize automatic adjustment of the pH value of the water body to be tested, self-movable addition of sodium chloride solution, automatic addition of standard liquid, automatic extraction or automatic multiple extraction, and automatic separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the fully automatic liquid-liquid extraction device of the present invention;

[0017] Figure 2 It is a structural diagram of the operating mechanism;

[0018] Among them, 1. multi-position sampler; 2. robotic arm; 3. extraction cup; 4. waste liquid storage device; 5. pH electrode; 6. agitator; 7. ultrasonic radar; 8. first peristaltic pump; 9. first BPT tube; 10. first three-way valve; 11. second three-way valve; 12. sodium chloride solution; 13. acidic solution; 14. alkaline solution; 15. second peristaltic pump; 16. second BPT tube; 17. storage tube rack; 18. storage tube; 19. multi-channel valve; 20. third peristaltic pump; 21. third three-way valve; 22. fourth three-way valve; 23. extraction reagent; 24. standard solution. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Reference Figure 1-Figure 2 The present invention provides a fully automatic liquid-liquid extraction device, including a multi-position sampler 1, a mechanical arm 2 is fixedly connected to one side of the multi-position sampler 1, an operating mechanism is provided at the end of the mechanical arm 2, a plurality of extraction cups 3 are provided on the multi-position sampler 1, the operating mechanism is connected with the extraction cup 3, a waste liquid storage device 4 is provided on the side of the multi-position sampler 1 away from the mechanical arm 2, the operating mechanism is respectively connected with a pH regulating mechanism, an extraction mechanism and a storage mechanism, a control system is externally provided with the multi-position sampler 1, and the control system is respectively electrically connected with the operating mechanism, the pH regulating mechanism and the extraction mechanism.

[0022] The water sample to be tested is placed in the extraction cup 3, and the parameter information required for the test is input into the control system. According to the parameter information set on the control system, the robot arm 2 is placed above the extraction cup 3, and the test is started through the operating mechanism. The pH adjustment mechanism is used to adjust the pH value of the water sample to be tested in the extraction cup 3, and the extraction mechanism is used for extraction. The extraction agent after extraction is placed in the storage mechanism for storage.

[0023] According to a further optimized solution, the operating mechanism includes a PH electrode 5, a stirrer 6, and an ultrasonic radar 7 respectively fixed to the ends of the robot arm 2; the PH electrode 5, the stirrer 6, and the ultrasonic radar 7 are respectively matched with the extraction cup 3; and the PH electrode 5, the stirrer 6, and the ultrasonic radar 7 are respectively electrically connected to the control system.

[0024] The pH electrode 5 is used to measure the current pH value of the water body; the ultrasonic radar 7 is used to detect the current height of the robotic arm 2 from the water surface in the extraction cup 3; the stirrer 6 fully mixes the extractant and the water sample by high-speed rotation, and in this process the extractant extracts the substance to be detected in the water sample.

[0025] A further optimized solution is provided, wherein the pH adjustment mechanism comprises a first peristaltic pump 8, wherein a first BPT tube 9 is provided on the first peristaltic pump 8, wherein one end of the first BPT tube 9 is connected to the inside of the extraction cup 3, and the other end of the first BPT tube 9 is connected to a first three-way valve 10, wherein one end of the first three-way valve 10 away from the first BPT tube 9 is connected to a second three-way valve 11, wherein the other end of the first three-way valve 10 away from the first BPT tube 9 is connected to a sodium chloride solution 12, and both ends of the second three-way valve 11 away from the first three-way valve 10 are respectively connected to an acidic solution 13 and an alkaline solution 14, and the first three-way valve 10 and the second three-way valve 11 are respectively electrically connected to a control system.

[0026] PH adjustment process: According to the target PH value input by the operator in the control system, the instrument automatically adds acid and alkali reagents. The process of adding acid solution: the robot arm 2 rotates to the waste liquid storage device 4, the right side of the first three-way valve 10 is switched to the upper interface, the right side of the second three-way valve 11 is switched to the upper interface, the first peristaltic pump 8 is powered on for a period of time and then turned off, allowing the acid solution to fill the pipeline, and then the robot arm 2 is turned to the top of the corresponding water sample, the robot arm 2 descends into the water sample, the first peristaltic pump 8 is powered on for a period of time and then turned off, the agitator 6 is powered on for a period of time and then turned off, the water sample is stirred evenly, and the PH electrode 5 obtains the current PH value; the process of adding alkali solution: the robot arm 2 rotates to the waste liquid storage device 4, The right side of the first three-way valve 10 is switched to the upper interface, the right side of the second three-way valve 11 is switched to the lower interface, the first peristaltic pump 8 is powered on for a period of time and then closed, allowing the alkaline solution to fill the pipeline, and then the robotic arm 2 turns to the top of the corresponding water sample, the robotic arm 2 descends into the water sample, the first peristaltic pump 8 is powered on for a period of time and then closed, the agitator 6 is powered on for a period of time and then closed to stir the water sample evenly, and the PH electrode 5 obtains the current PH value; the control system intelligently determines whether to execute the above-mentioned acid solution addition process or the alkaline solution addition process until the PH value of the water sample to be extracted reaches the set value.

[0027] If sodium chloride solution 12 needs to be added: the robotic arm 2 rotates to the waste liquid storage device 4, the right side of the first three-way valve 10 is switched to the lower interface, the first peristaltic pump 8 is powered on for a period of time and then closed, allowing the sodium chloride solution 12 to fill the pipeline, and then the robotic arm 2 rotates to the top of the corresponding water sample, the robotic arm 2 descends into the water sample, the first peristaltic pump 8 is powered on for a period of time and then closed, and the agitator 6 is powered on for a period of time and then closed to stir the water sample evenly.

[0028] According to a further optimized solution, the storage mechanism comprises a second peristaltic pump 15 , on which a second BPT tube 16 is disposed, one end of the second BPT tube 16 is connected to the extraction cup 3 , and the other end of the second BPT tube 16 is connected to a storage unit.

[0029] To further optimize the solution, the storage part includes a storage pipe rack 17, on which a plurality of storage pipes 18 are arranged, and a multi-channel valve 19 is provided on the top of the storage pipe 18. The multi-channel valve 19 is respectively connected to the plurality of storage pipes 18, and the multi-channel valve 19 is connected to the other end of the second BPT pipe 16.

[0030] To further optimize the solution, the extraction mechanism includes a third peristaltic pump 20, the third peristaltic pump 20 is connected to a third three-way valve 21, the third three-way valve 21 is connected to the extraction cup 3 away from the bottom of the third peristaltic pump 20, the third three-way valve 21 is connected to the fourth three-way valve 22 away from the top of the third peristaltic pump 20, the fourth three-way valve 22 is connected to the extraction reagent 23 and the standard solution 24 at both ends away from the third three-way valve 21, and the third three-way valve 21 and the fourth three-way valve 22 are electrically connected to the control system respectively.

[0031] Need to add standard liquid 24: the robot arm 2 rotates to the waste liquid storage 4, the left side of the third three-way valve 21 is switched to the upper end, the left side of the fourth three-way valve 22 is switched to the lower end, and after the third peristaltic pump 20 extracts a certain volume of standard liquid 24, the left side of the third three-way valve 21 is switched to the lower end, and the third peristaltic pump 20 pushes out the standard liquid 24 of this volume to fill the pipeline, the left side of the third three-way valve 21 is switched to the upper end, the left side of the fourth three-way valve 22 is switched to the lower end, the third peristaltic pump 20 extracts the volume of standard liquid 24 set on the control system, the left side of the third three-way valve 21 is switched to the lower end, the robot arm 2 rotates to the top of the corresponding water sample, descends into the water sample, and the third peristaltic pump 20 pushes out the standard liquid 24 of this volume. The agitator 6 is turned on for a period of time and then closed to mix the standard liquid 24 and the water sample evenly.

[0032] One extraction: First, according to the editing content on the control system, execute the above-mentioned contents of whether to adjust the pH, whether to add sodium chloride solution 12, and whether to add standard liquid 24. Then the robot arm 2 rotates to the waste liquid storage 4, the left side of the third three-way valve 21 is switched to the upper end, and the left side of the fourth three-way valve 22 is switched to the upper end. After the third peristaltic pump 20 extracts a certain volume of extractant, the left side of the third three-way valve 21 is switched to the lower end, and the third peristaltic pump 20 pushes out the standard liquid 24 of this volume for filling the pipeline. The left side of the third three-way valve 21 is switched to the upper end, and the left side of the fourth three-way valve 22 is switched to the upper end. The third peristaltic pump 20 extracts the volume of extractant set on the control system, and the left side of the third three-way valve 21 is switched to the lower end. The robot arm 2 rotates to the top of the corresponding water sample, descends into the water sample, and the third peristaltic pump 20 pushes out the volume of extractant. The agitator 6 is turned on for a period of time to fully stir the extractant and the water sample for extraction, and then the agitator 6 is turned off. Let it stand for a period of time to allow the extractant and the water sample to fully stratify. If the density of the extractant is greater than that of water, the extractant sinks to the bottom of the water, the multi-channel valve 19 opens a channel, the second peristaltic pump 15 is powered on for a period of time, and the extractant at the bottom of the water sample is transferred to the storage tube 18. If the density of the extractant is less than that of water, the extractant floats on the surface of the water, the robotic arm 2 rises to the initial height, the ultrasonic radar 7 is powered on, and after measuring the height of the robotic arm 2 from the liquid surface at this time, it descends the distance and then moves another 10 mm, the multi-channel valve 19 opens a channel, the second peristaltic pump 15 is powered on for a period of time, and the extractant on the surface of the water sample is transferred to the storage tube 18.

[0033] Multiple extractions: After completing the steps of "one extraction" completely, copy the steps of "one extraction" and do the remaining extraction actions.

[0034] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A fully automatic liquid-liquid extraction device, characterized in that: The invention comprises a multi-position sample injector (1), a mechanical arm (2) is fixedly connected to one side of the multi-position sample injector (1), an operating mechanism is arranged at the end of the mechanical arm (2), a plurality of extraction cups (3) are arranged on the multi-position sample injector (1), the operating mechanism is connected to the extraction cups (3), a waste liquid storage device (4) is arranged on the side of the multi-position sample injector (1) away from the mechanical arm (2), the operating mechanism is respectively connected to a pH regulating mechanism, an extraction mechanism and a storage mechanism, and a control system is arranged outside the multi-position sample injector (1), the control system is respectively electrically connected to the operating mechanism, the pH regulating mechanism and the extraction mechanism; The operating mechanism comprises a pH electrode (5), a stirrer (6), and an ultrasonic radar (7) respectively fixed to the ends of the mechanical arm (2); the pH electrode (5), the stirrer (6), and the ultrasonic radar (7) are respectively adapted to the extraction cup (3); and the pH electrode (5), the stirrer (6), and the ultrasonic radar (7) are respectively electrically connected to the control system; The pH adjustment mechanism comprises a first peristaltic pump (8), the first peristaltic pump (8) is provided with a first BPT tube (9), one end of the first BPT tube (9) is connected to the inside of the extraction cup (3), the other end of the first BPT tube (9) is connected to a first three-way valve (10), one end of the first three-way valve (10) away from the first BPT tube (9) is connected to a second three-way valve (11), the other end of the first three-way valve (10) away from the first BPT tube (9) is connected to a sodium chloride solution (12), the two ends of the second three-way valve (11) away from the first three-way valve (10) are respectively connected to an acidic solution (13) and an alkaline solution (14), and the first three-way valve (10) and the second three-way valve (11) are respectively electrically connected to the control system.

2. The fully automatic liquid-liquid extraction device according to claim 1, characterized in that: The storage mechanism comprises a second peristaltic pump (15), the second peristaltic pump (15) is provided with a second BPT tube (16), one end of the second BPT tube (16) is connected to the inside of the extraction cup (3), and the other end of the second BPT tube (16) is connected to a storage unit.

3. The fully automatic liquid-liquid extraction device according to claim 2, characterized in that: The storage section comprises a storage pipe rack (17), a plurality of storage pipes (18) are arranged on the storage pipe rack (17), a multi-channel valve (19) is arranged on the top of the storage pipe (18), the multi-channel valve (19) is respectively connected to the plurality of storage pipes (18), and the multi-channel valve (19) is connected to the other end of the second BPT pipe (16).

4. The fully automatic liquid-liquid extraction device according to claim 1, characterized in that: The extraction mechanism comprises a third peristaltic pump (20), the third peristaltic pump (20) is connected to a third three-way valve (21), the third three-way valve (21) is connected to the extraction cup (3) away from the bottom of the third peristaltic pump (20), the third three-way valve (21) is connected to a fourth three-way valve (22) away from the top of the third peristaltic pump (20), the two ends of the fourth three-way valve (22) away from the third three-way valve (21) are respectively connected to an extraction reagent (23) and a standard solution (24), and the third three-way valve (21) and the fourth three-way valve (22) are respectively electrically connected to the control system.

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