Automated extraction device for sulfur in soil samples

Abstract

An automated device for extracting sulfur from soil samples relates to the technical field of soil component extraction. The device comprises a support, a centrifugal mechanism, an oscillating mechanism, a liquid-feeding mechanism, a distilling mechanism, and a heating mechanism. The centrifugal mechanism is mounted on the support, the oscillating mechanism is mounted on the centrifugal mechanism, and the oscillating mechanism is used to position the sample tube; the liquid-feeding mechanism is mounted on the support, and is used to add liquid to the sample tube; the distilling mechanism is mounted on the heating mechanism, and the heating mechanism is mounted on the support; the centrifugal mechanism is used to rotate the oscillating mechanism, and the oscillating mechanism is used to vibrate the sample tube; and the liquid-feeding mechanism is used to flush the mixed liquid in the sample tube into the distilling mechanism. This device improves automation, reduces manual intervention, lowers labor intensity, minimizes errors, and improves the accuracy of experimental results.

Description

Technical Field

[0001] The present invention relates to the technical field of soil component extraction, and in particular to an automatic extraction device for sulfur in soil samples. Background Art

[0002] Sulfur is an essential element for life. Due to its active chemical properties, sulfur exists in many forms. In recent years, with the development of various industrial processes, sulfur dioxide emissions have continued to increase, and its transformation and migration between the atmosphere, biosphere, hydrosphere, and soil sphere have also continued to intensify. Accurate analysis and measurement of sulfur content in various states of existence is a fundamental prerequisite for conducting research on biogeochemical cycles and plant sulfur nutrition. Sulfur in soil primarily consists of inorganic and organic sulfur. Depending on the stage of sulfur chemical extraction, it can be divided into four forms: soluble sulfur, adsorbed sulfur, hydrochloric acid-soluble sulfur, and volatile sulfur.

[0003] The inventors discovered during their research that the existing methods for extracting sulfur from soil samples have at least the following disadvantages:

[0004] Traditional extraction methods are basically manual extraction. Not only is the experimental process cumbersome and the extraction efficiency low, but the extraction effect also varies depending on the operator's level, which leads to deviations in the experimental results. Summary of the Invention

[0005] The purpose of the present invention includes, for example, providing an automated extraction device for sulfur in soil samples, which can improve the degree of automation, reduce manual participation, reduce labor intensity, reduce errors, and improve the accuracy of experimental results.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides an automated device for extracting sulfur from a soil sample, comprising a support, a centrifugal mechanism, an oscillating mechanism, a liquid adding mechanism, a distillation mechanism, and a heating mechanism, wherein:

[0008] The centrifugal mechanism is mounted on the bracket, the oscillating mechanism is mounted on the centrifugal mechanism, and the oscillating mechanism is used to position the sample tube; the liquid adding mechanism is mounted on the bracket, and the liquid adding mechanism is used to add liquid into the sample tube; the distillation mechanism is mounted on the heating mechanism, and the heating mechanism is mounted on the bracket;

[0009] The centrifugal mechanism is used to drive the oscillating mechanism to rotate, and the oscillating mechanism is used to drive the sample tube to vibrate; the liquid adding mechanism is also used to use liquid to flush the mixed liquid in the sample tube into the distillation mechanism.

[0010] In an optional embodiment, the bracket includes a support plate, support legs and a support frame, the support legs and the support frame are both fixed to the support plate, the centrifugal mechanism is installed on the support frame, and the heating mechanism is installed on the support legs.

[0011] In an optional embodiment, the oscillation mechanism includes an elastic plate and a vibration disk, the elastic plate is connected to the centrifugal mechanism and suspended in the air, and the vibration disk is mounted on the elastic plate; a positioning through hole for positioning the sample tube is provided on the elastic plate.

[0012] In an optional embodiment, there are multiple vibration disks and they are arranged at intervals in the circumferential direction of the elastic plate.

[0013] In an optional embodiment, the liquid adding mechanism includes a fixed plate, a lifting module, a peristaltic pump, a first liquid adding bottle and a second liquid adding bottle; the fixed plate is connected to the bracket, the lifting module, the first liquid adding bottle and the second liquid adding bottle are all installed on the fixed plate, and the peristaltic pump is connected to the telescopic end of the lifting module to drive the peristaltic pump to rise or fall relative to the oscillation mechanism, and the peristaltic pump can be inserted into the sample tube during the descent process and the liquid in the sample tube can be sucked into the set container.

[0014] In an optional embodiment, the liquid adding mechanism further includes a sliding module and a cleaning assembly, the sliding module is mounted on the fixed plate, the lifting module is mounted on the telescopic end of the sliding module, the sliding module is used to drive the lifting module to slide in a direction perpendicular to the rotation axis of the oscillation mechanism to adjust the position of the peristaltic pump relative to the sample tube; the cleaning assembly is mounted on the elastic plate, and the cleaning assembly is used to provide cleaning fluid for cleaning the peristaltic pump.

[0015] In an optional embodiment, the elastic plate is provided with an annular liquid collecting groove surrounding the rotation axis, and a guide groove is provided in the annular liquid collecting groove, the guide groove is an arc-shaped groove extending around a preset axis, and the bottom wall of the guide groove is provided as a guiding inclined surface;

[0016] The cleaning assembly includes a liquid adding part, a support seat, a rotating arm, a sliding sleeve, a first cleaning tube, a second cleaning tube, a one-way valve and an elastic part; the liquid adding part is installed on the fixing plate; the support seat is fixed in the annular liquid collecting trough; a water supply channel is provided on the rotating arm, and the rotating arm is rotatably installed on the support seat around the preset axis; the sliding sleeve is connected to one end of the rotating arm, the first cleaning tube is slidably inserted into the sliding sleeve along the extension direction of the preset axis, and the bottom of the first cleaning tube contacts the guide inclined surface; a drain port is provided on the first cleaning tube, and a water inlet is provided on the second cleaning tube, and the second cleaning tube is installed at the other end of the rotating arm, the drain port is connected to the water supply channel, and the water supply channel is connected to the water inlet; the one-way valve is installed at the water inlet, and the one-way valve only allows the fluid in the water supply channel to flow into the second cleaning tube through the water inlet;

[0017] The elastic member is installed in the guide groove, and the elastic member contacts the groove wall of the guide groove and the first cleaning tube at the same time. The elastic member is used to make the first cleaning tube have a tendency to slide along the upward slope of the guide slope;

[0018] The peristaltic pump has a first pipe opening and a second pipe opening that are connected; when the first pipe opening is connected to the first cleaning test tube, the second pipe opening and the second cleaning test tube have a distance therebetween in the circumferential direction of the rotating arm; when the first pipe opening and the first cleaning test tube have a distance therebetween in the circumferential direction of the rotating arm, the second pipe opening is connected to the second cleaning test tube.

[0019] In an optional embodiment, the distillation mechanism includes a funnel, a distillation flask, a first liquid-adding test tube, a second liquid-adding test tube, an exhaust pipe, a connecting pipe, a flask, a third liquid-adding test tube, and an air inlet pipe; the funnel, the first liquid-adding test tube, the second liquid-adding test tube, and the exhaust pipe are all mounted on the first stopper of the distillation flask and connected to the distillation flask; the third liquid-adding test tube and the air inlet pipe are both mounted on the second stopper of the flask and connected to the flask; one end of the connecting pipe is connected to the first stopper and connected to the distillation flask, and the other end of the connecting pipe is connected to the second stopper and connected to the flask, and the port of the connecting pipe connected to the first stopper is higher than the port of the connecting pipe connected to the second stopper;

[0020] The funnel is used to receive the mixed liquid discharged from the sample tube.

[0021] In an optional embodiment, the distillation mechanism further includes a condenser, which is sleeved on the outside of the guide tube and is used to condense the gas flowing in the guide tube into liquid.

[0022] In an optional embodiment, the heating mechanism includes a first heating plate and a second heating plate, both of which are connected to the bracket, the distillation flask is in contact with the first heating plate, and the flask is in contact with the second heating plate.

[0023] The beneficial effects of the embodiments of the present invention include, for example:

[0024] In summary, the automated sulfur extraction device for soil samples provided in this embodiment comprises the following steps: the sample tube is positioned on the oscillating mechanism, the sample is added to the sample tube, and then a set amount of water is automatically added to the sample tube by the liquid adding mechanism. The upper opening of the sample tube is closed, the oscillating mechanism is started, the sample tube is oscillated for the first time, and then the oscillating mechanism is closed and the centrifugation mechanism is started to obtain a first supernatant by centrifugation. A fixed amount of the first supernatant in the sample tube is drawn by the liquid adding mechanism, and the volume is fixed before testing, thereby completing the extraction of water-soluble sulfur. The remaining primary supernatant is completely aspirated, and a predetermined concentration of NaH2PO4 is then added to the sample tube using a liquid-feeding mechanism. After oscillation and centrifugation, a secondary supernatant is obtained. The liquid-feeding mechanism then aspirates a predetermined amount of the secondary supernatant, brings the volume to a constant level, and is then tested, completing the extraction of adsorbed sulfur. Next, the valve at the bottom of the sample tube is opened, and the liquid-feeding mechanism simultaneously flushes water into the tube from the top. The combined force of the water and gravity forces the mixed solution into the distillation mechanism, preventing it from adsorbing and remaining in the tube, facilitating subsequent extraction and determination of sulfur in the soil. The subsequent distillation mechanism and heating mechanism work together to extract and determine hydrochloric acid-soluble sulfur in the soil. This allows for highly automated and efficient determination of various forms of sulfur in soil, with minimal human intervention, minimal error, and accurate and reliable experimental results. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 Schematic diagram of the automated extraction device for sulfur in soil samples of this embodiment;

[0027] Figure 2 is a schematic diagram of the oscillation mechanism of this embodiment;

[0028] Figure 3 is a schematic diagram of a deformation of the oscillation mechanism of this embodiment;

[0029] Figure 4 is a schematic cross-sectional view of the elastic plate of this embodiment;

[0030] Figure 5 is a schematic diagram of a state of the cleaning component of this embodiment;

[0031] Figure 6 is a schematic diagram of another state of the cleaning component of this embodiment;

[0032] Figure 7 This is a partial schematic diagram of the cleaning assembly of this embodiment;

[0033] Figure 8 This is a partial schematic diagram of the liquid adding mechanism of this embodiment;

[0034] Figure 9 Schematic diagram of the distillation mechanism of this embodiment;

[0035] Figure 10 Schematic diagram of the heating mechanism of this embodiment.

[0036] icon:

[0037] 001-sample tube; 100-bracket; 110-support plate; 120-support leg; 130-support frame; 200-centrifugal mechanism; 300-oscillation mechanism; 310-elastic plate; 311-positioning through hole; 312-annular liquid collecting trough; 320-vibration plate; 330-boss; 331-guide groove; 332-guide slope; 333-first side; 334-second side; 400-liquid adding mechanism; 410-fixed plate; 420-lifting module; 430-peristaltic pump; 431-first pipe port; 432-second pipe port; 440-first liquid adding bottle; 450-second liquid adding bottle; 460-sliding module; 470- Cleaning assembly; 471-support base; 472-rotating arm; 4721-water transfer channel; 473-sleeve; 474-first cleaning test tube; 4741-drain outlet; 475-second cleaning test tube; 4751-water inlet; 476-one-way valve; 477-elastic member; 500-distillation mechanism; 510-funnel; 520-distillation flask; 530-first liquid addition test tube; 540-second liquid addition test tube; 550-conducting tube; 560-flask; 570-third liquid addition test tube; 580-inlet pipe; 590-exhaust pipe; 591-condenser; 600-heating mechanism; 610-first heating plate; 620-second heating plate. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0041] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0043] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0044] In the prior art, the extraction of different forms of sulfur in soil basically relies on manual operation, which is labor-intensive, inefficient, has large errors, and poor accuracy of experimental results.

[0045] In view of this, the designer provides an automated extraction device for sulfur in soil samples, which has a high degree of automation, high efficiency, less manual participation, small errors and high accuracy of experimental results.

[0046] Please refer to Figures 1-10This embodiment provides an automated device for extracting sulfur from soil samples, comprising a support 100, a centrifugal mechanism 200, an oscillating mechanism 300, a liquid adding mechanism 400, a distillation mechanism 500, and a heating mechanism 600. The centrifugal mechanism 200 is mounted on the support 100, and the oscillating mechanism 300 is mounted on the centrifugal mechanism 200. The oscillating mechanism 300 is used to position the sample tube 001. The liquid adding mechanism 400 is mounted on the support 100 and is used to add liquid to the sample tube 001. The distillation mechanism 500 is mounted on the heating mechanism 600, which is also mounted on the support 100. The centrifugal mechanism 200 is used to rotate the oscillating mechanism 300, which is used to vibrate the sample tube 001. The liquid adding mechanism 400 is also used to flush the mixed liquid in the sample tube 001 into the distillation mechanism 500 using liquid.

[0047] It should be noted that the top of sample tube 001 is open and is provided with a sealing plug that can open or close the top opening. The bottom of sample tube 001 is provided with an outlet, and the outlet is provided with a solenoid valve that can open or close the outlet. During centrifugation or oscillation, the top opening and bottom outlet of sample tube 001 are closed. When liquid needs to be added or aspirated, the top sealing plug is opened. When the mixture in sample tube 001 needs to be discharged, the bottom solenoid valve is opened.

[0048] As described above, the automated sulfur extraction device provided in this embodiment works as follows:

[0049] The soil sample is added to the sample tube 001, and the sample tube 001 is positioned on the oscillating mechanism 300. Then, a set amount of water is automatically added to the sample tube 001 through the liquid adding mechanism 400. The upper opening of the sample tube 001 is closed, and the oscillating mechanism 300 is started to oscillate the sample tube 001 for the first time. Then, the oscillating mechanism 300 is closed and the centrifugal mechanism 200 is started to obtain the first supernatant by centrifugation. The liquid adding mechanism 400 is used to draw a certain amount of the first supernatant from the sample tube 001, and the volume is fixed before testing, thus completing the extraction of water-soluble sulfur. Then, the liquid adding mechanism 400 is used to first draw out all the remaining first supernatant in the sample tube 001, and then the liquid adding mechanism 400 is used to draw out all the remaining first supernatant in the sample tube 001. A predetermined concentration of NaH2PO4 is added to sample tube 001. After oscillation and centrifugation, a secondary supernatant is obtained. Liquid-adding mechanism 400 then draws a predetermined amount of the secondary supernatant, quantifies the volume, and prepares the sample for testing, completing the extraction of adsorbed sulfur. Next, the valve at the bottom of sample tube 001 is opened, and liquid-adding mechanism 400 simultaneously flushes water into the sample tube from the top. The combined force of the water and gravity forces the mixed solution into distillation mechanism 500, preventing it from being adsorbed and remaining in sample tube 001, facilitating subsequent extraction and determination of sulfur in the soil. The subsequent distillation mechanism 500 and heating mechanism 600 collaborate to extract and determine hydrochloric acid-soluble sulfur in the soil. This allows for highly automated and efficient determination of various forms of sulfur in soil, with minimal human intervention, minimal error, and accurate and reliable experimental results.

[0050] The following examples illustrate the detailed structure of the automatic extraction device for sulfur in soil samples of the present application by way of examples.

[0051] Please refer to Figures 1-10 In this embodiment, optionally, the automated extraction device for sulfur in soil samples includes a support 100 , a centrifugal mechanism 200 , an oscillation mechanism 300 , a liquid adding mechanism 400 , a distillation mechanism 500 and a heating mechanism 600 .

[0052] Please refer to Figure 1 Optionally, the bracket 100 includes a support plate 110, support legs 120, and a support frame 130. The support plate 110 is configured as a circular plate, and the number of support legs 120 can be four. One end of the four support legs 120 is fixed to the bottom of the support plate 110, and the other end of the support legs 120 is connected to the heating mechanism 600. The support frame 130 can be a rectangular frame, which is installed above the support plate 110. The bracket 100 has a simple structure, is easy to process and manufacture, and has low cost.

[0053] Optionally, the support plate 110 is provided with a plurality of through-holes for assembly. The number of through-holes for assembly is selected as needed. Each through-hole for assembly can be a circular through-hole. Each through-hole for assembly can be perpendicular to the surface of the support plate 110. The plurality of through-holes for assembly can be evenly spaced and arranged circumferentially about the rotation axis of the oscillation mechanism 300. The rotation axis is perpendicular to the surface of the support plate 110, and the centerline of the support plate 110 coincides with the rotation axis.

[0054] Please refer to Figure 1 In this embodiment, optionally, the centrifugal mechanism 200 includes a centrifugal motor, which is fixed to the support frame 130. The rotating shaft of the centrifugal motor is coaxially arranged with the support plate 110, that is, the axis of the rotating shaft of the centrifugal motor coincides with the rotation axis.

[0055] Please refer to Figure 1-Figure 2 In this embodiment, the oscillation mechanism 300 optionally includes an elastic plate 310 and a vibration disk 320. The elastic plate 310 can be configured as a circular plate, connected to the rotating shaft of the centrifugal motor and suspended in the air. The elastic plate 310 and the rotating shaft are coaxially arranged, and the elastic plate 310 is located above the support plate 110 with a gap therebetween. The number of vibration disks 320 can be four, each mounted on the elastic plate 310, and the four vibration disks 320 are evenly spaced around the axis of the elastic plate 310.

[0056] It should be understood that the elastic plate 310 can be set as a rubber plate with a certain elastic deformation ability. The detailed structure and working principle of the vibration plate 320 can refer to the existing known structure and will not be described in detail in this embodiment.

[0057] Please refer to Figure 3-Figure 4Optionally, the elastic plate 310 is provided with a plurality of positioning through holes 311 for positioning the sample tube 001. Each positioning through hole 311 can be a circular through hole. The plurality of positioning through holes 311 are arranged at intervals around the rotation axis. The number of positioning through holes 311 is selected as needed. A sample tube 001 can be inserted into each positioning through hole 311. At the same time, the elastic plate 310 is provided with an annular liquid collecting groove 312 around the rotation axis. The annular liquid collecting groove 312 can be formed by concavely forming a part of the annular area of ​​the elastic plate 310, which can reduce the thickness of the annular liquid collecting groove 312. In addition, the positioning through holes 311 and the vibration disk 320 are both provided on the outside of the annular liquid collecting groove 312. When the vibration disk 320 is running, the part of the elastic plate 310 located on the outside of the annular liquid collecting groove 312 is easy to deform, and the oscillation effect is good. A boss 330 is provided on the bottom wall of the annular liquid collecting trough 312. The boss 330 thickens a portion of the annular liquid collecting trough 312. A guide groove 331 is provided on the boss 330. The guide groove 331 is an arc-shaped groove extending around the rotation axis, and the bottom wall of the guide groove 331 is provided with a guide slope 332. For ease of description, the guide groove 331 has a first side 333 and a second side 334 along its extension direction. The first side 333 is closer to the outside of the elastic plate 310, and the second side 334 is closer to the inside of the elastic plate 310. The height of the first side 333 is higher than that of the second side 334, and the direction from the second side 334 to the first side 333 is an uphill direction.

[0058] Please refer to Figure 1 、 Figure 3-Figure 8 Optionally, the liquid adding mechanism 400 includes a fixed plate 410, a lifting module 420, a peristaltic pump 430, a first liquid adding bottle 440, a second liquid adding bottle 450, a sliding module 460 and a cleaning assembly 470. The fixed plate 410 is fixedly connected to the support frame 130. The sliding module 460, the first liquid adding bottle 440 and the second liquid adding bottle 450 are all mounted on the fixed plate 410, the lifting module 420 is mounted on the telescopic end of the sliding module 460, and the peristaltic pump 430 is connected to the telescopic end of the lifting module 420. The sliding module 460 is used to drive the lifting module 420 and the peristaltic pump 430 to slide back and forth in the radial direction of the support plate 110, and the lifting module 420 is used to drive the peristaltic pump 430 to move in the extension direction of the rotation axis relative to the oscillation mechanism 300 to simulate rising or falling. Meanwhile, during its descent, peristaltic pump 430 can be inserted into sample tube 001 and pump the liquid in sample tube 001 into a designated container. During its ascent, peristaltic pump 430 can be withdrawn from sample tube 001. By controlling the height of peristaltic pump 430, the height at which peristaltic pump 430 is inserted into sample tube 001 can be controlled, thereby adjusting the amount of supernatant liquid drawn. A cleaning assembly 470 is mounted on elastic plate 310 and is used to provide cleaning fluid for cleaning peristaltic pump 430.

[0059] In addition, the peristaltic pump 430 is provided with a first nozzle 431 and a second nozzle 432 that are connected. The first nozzle 431 can be inserted into the sample tube 001, so that the liquid in the sample tube 001 is sucked out from the second nozzle 432. The sucked liquid can be stored in a set container, which can be a test tube installed on the elastic plate 310. Each sample tube 001 corresponds to a test tube. After the supernatant is sucked, it is directly stored in the test tube and the volume is fixed to be measured. Obviously, when the first supernatant and the secondary supernatant are sucked separately, they can correspond to different test tubes, that is, the first supernatant is sucked corresponding to the first test tube. After sucking, the first test tube is removed. When it is necessary to suck the secondary supernatant, the second test tube is installed in the position of the original first test tube, and the peristaltic pump 430 is used to suck the secondary supernatant into the second test tube.

[0060] It should be noted that water can be stored in the first liquid adding bottle 440 and NaH2PO4 solution can be stored in the second liquid adding bottle 450. During the experiment, the water in the first liquid adding bottle 440 is used to flush the mixed solution in the sample tube 001 into the distillation mechanism 500.

[0061] Please refer to Figure 3-Figure 8Optionally, the cleaning assembly 470 includes a liquid adding part, a support seat 471, a rotating arm 472, a sleeve 473, a first cleaning tube 474, a second cleaning tube 475, a one-way valve 476 and an elastic part 477. The liquid adding part is mounted on the fixed plate 410. One end of the adding part can be connected to the water source, and the other end can transport the water source to the first cleaning tube 474. The support seat 471 is fixed in the annular liquid collecting tank 312. A water delivery channel 4721 is provided on the rotating arm 472, and the rotating arm 472 is rotatably mounted on the support seat 471 around a preset axis; the sleeve 473 is connected to one end of the rotating arm 472, and the first cleaning tube 474 is slidably inserted into the sleeve 473 along the extension direction of the preset axis, and the bottom of the first cleaning tube 474 is in contact with the guide slope 332. A drain port 4741 is provided on the first cleaning tube 474, and a water inlet 4751 is provided on the second cleaning tube 475. The second cleaning tube 475 is mounted on the other end of the rotating arm 472. The drain port 4741 is connected to the water channel 4721, which in turn is connected to the water inlet 4751. A one-way valve 476 is mounted on the water inlet 4751. The one-way valve 476 only allows the fluid in the water channel 4721 to flow into the second cleaning tube 475 through the water inlet 4751. The elastic member 477 is installed in the guide groove 331. The elastic member 477 is in contact with the groove side wall of the second side 334 of the guide groove 331 and the first cleaning tube 474 at the same time. The elastic member 477 is used to make the first cleaning tube 474 have a tendency to slide along the upward direction of the guide slope 332. When the first cleaning tube 474 slides along the guide slope 332, due to the sliding cooperation between the first cleaning tube 474 and the sliding sleeve 473, the first cleaning tube 474 can also adaptively rise or fall to avoid interference with the guide slope 332.

[0062] Optionally, the elastic member 477 may be a spring.

[0063] It should be understood that the cleaning assembly 470 is primarily used to clean the peristaltic pump 430 to prevent cross-contamination when the peristaltic pump 430 draws supernatant in different steps. During the experiment, the peristaltic pump 430 is cleaned using the liquid in the first cleaning tube 474 and the second cleaning tube 475. It should be understood that liquid can be added to the first cleaning tube 474 through the liquid adding member, and when the first cleaning tube 474 has sufficient liquid, the liquid level is at the drain port 4741. The liquid flows from the drain port 4741 into the delivery channel, and then enters the second cleaning tube 475 through the water inlet 4751 through the water delivery channel 4721 until the liquid addition to the second cleaning tube 475 is completed. Due to the design of the one-way valve 476, the liquid in the second cleaning tube 475 will not flow back into the first cleaning tube 474. When the first cleaning tube 474 and the second cleaning tube 475 are both in a state of adding an appropriate amount of liquid, the first cleaning tube 474 and the liquid therein have a tendency to slide from the first side 333 to the second side 334 under the action of gravity, and the elastic force of the elastic member 477 can limit the position where the first cleaning tube 474 slides downward. In this way, the combined force of gravity and elastic force causes the first cleaning tube 474 to be stationary relative to the guide groove 331. At this time, the first cleaning tube 474 and the second cleaning tube 475 are in the initial position, please refer to Figure 5 When the liquid in the first cleaning tube 474 is pumped out by the peristaltic pump 430, the first cleaning tube 474 rotates counterclockwise under the action of the elastic member 477 and rises to a certain height. Correspondingly, the second cleaning tube 475 rotates counterclockwise until the force balance is reached for the second time. At this time, the first cleaning tube 474 and the second cleaning tube 475 are in the second position. Please refer to Figure 6 . When the liquid in the second cleaning test tube 475 is pumped out by the peristaltic pump 430, the cleaning operation of the peristaltic pump 430 is completed. When the peristaltic pump 430 needs to be cleaned again, liquid can be added using the liquid adding part. During the process of adding liquid, due to the gradual increase in gravity, the first cleaning test tube 474 slides down and drives the second cleaning test tube 475 to rotate clockwise and return to its original position for the next use. Since the first cleaning test tube 474 rotates clockwise when liquid is added, the liquid adding port of the liquid adding part can also rotate clockwise with the first cleaning test tube 474 to avoid liquid waste.

[0064] It should be understood that the liquid adding component can be a water pump, the water outlet of the water pump is installed with a hose, the outlet of the hose can be a liquid adding port, and the hose can be driven by a stepper motor to adjust the position of the liquid adding port.

[0065] When the peristaltic pump 430 needs to be cleaned, for example, after the peristaltic pump 430 has extracted the remaining cleaning liquid from the initial cleaning liquid in the sample tube 001 and before a secondary cleaning liquid suction is required, the lifting module 420 is first activated to drive the peristaltic pump 430 to rise and reset, and then the sliding module 460 is activated to drive the peristaltic pump 430 to move inward toward the first cleaning tube 474. The first cleaning tube 474 and the second cleaning tube 475 are both maintained in their initial positions, and when the first nozzle 431 is located above the first cleaning tube 474, the second nozzle 432 is exactly spaced apart from the second cleaning tube 475 in the circumferential direction of the rotating arm 472, and the second nozzle 432 is located in front of the second cleaning tube 475 in the counterclockwise direction. The lifting module 420 is used to drive the peristaltic pump 430 to descend so that its first pipe mouth 431 is inserted into the first cleaning test tube 474, and in the counterclockwise direction, the first pipe mouth 431 is located in front of the axis of the first cleaning test tube 474, and the distance between the first pipe mouth 431 and the inner tube wall at the rear of the first cleaning test tube 474 is L. When the peristaltic pump 430 is started, the first pipe mouth 431 can be used to quickly absorb the liquid in the first cleaning test tube 474 and discharge the liquid from the second pipe mouth 432. Since the second pipe mouth 432 is staggered with the second cleaning test tube 475, the liquid discharged from the second pipe mouth 432 is directly discharged into the annular liquid collecting tank 312. During this process, due to the rapid decrease in the liquid in the first cleaning tube 474, the peristaltic pump 430 absorbs the liquid for a period of time. After absorption, the peristaltic pump 430 can be driven to rise rapidly through the lifting module 420. Moreover, due to the hysteresis of the elastic force of the elastic member 477, the first nozzle 431 of the peristaltic pump 430 has enough time to rise and leave the first cleaning tube 474, thus preventing the two from interfering with each other. In other words, the time for the peristaltic pump 430 to pump liquid is set to t1. By increasing the power of the peristaltic pump 430, it is possible to quickly pump liquid, so that the time t1 is no more than 1s. After the liquid is sucked, the lifting module 420 is immediately started to drive the peristaltic pump 430 to rise. The time required for the bottom of the first nozzle 431 of the peristaltic pump 430 to just leave the top port of the first cleaning tube 474 is t2. It should be understood that by setting the telescopic module to an electromagnetic actuator or a pneumatic actuator, etc., a millisecond-level telescopic speed can be achieved, so that the time t2 is no more than 0.5s. At the same time, when After the liquid is sucked out, the gravity acting on the elastic member 477 decreases, the elastic force of the elastic member 477 is greater than the gravity, and the elastic member 477 gradually pushes the first cleaning tube 474 to rise. At the same time, the first cleaning tube 474 rotates counterclockwise and gradually approaches the first tube opening 431. It is set that the time required for the inner tube wall movement L of the first cleaning tube is t3, and t1+t2<t3. In this way, before the first tube opening 431 leaves the top of the first cleaning tube, the first cleaning tube will not collide with the first tube opening 431, that is, the first tube opening 431 and the first cleaning tube 474 will not interfere with each other.

[0066] After the liquid in the first cleaning tube 474 is sucked out, the peristaltic pump 430 completes a primary cleaning. Subsequently, under the action of the elastic member 477, the first cleaning tube 474 moves in an uphill direction. When the first cleaning tube 474 and the second cleaning tube 475 move to the second position, the second nozzle 432 is exactly above the second cleaning tube 475. The first cleaning tube 474 is also spaced apart from the first nozzle 431 in the circumferential direction of the rotating arm 472. The lifting module 420 is activated, driving the peristaltic pump 430 downward, inserting the second cleaning liquid into the second nozzle 432. The peristaltic pump 430 is then activated to extract the liquid from the second cleaning tube 475, completing the secondary cleaning of the peristaltic pump 430. In this way, the peristaltic pump 430 can perform two cleaning operations, forward and reverse, achieving a good cleaning effect.

[0067] It should be understood that a plurality of sample tubes 001 are provided on the elastic plate 310, and the plurality of sample tubes 001 are arranged on the same circumference, and the first tube port 431 or the second tube port 432 of the peristaltic pump 430 can be located on the circumference. Through the centrifugal mechanism 200, the plurality of sample tubes 001 can be driven to pass through the peristaltic pump 430 in sequence, thereby the peristaltic pump 430 can sequentially suck out the supernatant in each sample tube 001.

[0068] It should be noted that the first cleaning tube 474 and the second cleaning tube 475 can be arranged in the radial direction of the preset axis, so that the radial space can be reasonably utilized.

[0069] Please refer to Figure 9 In this embodiment, the distillation mechanism 500 optionally includes a funnel 510, a distillation flask 520, a first liquid-adding test tube 530, a second liquid-adding test tube 540, an exhaust pipe 590, a connecting pipe 550, a flask 560, a third liquid-adding test tube 570, an air inlet pipe 580, and a condenser 591. The funnel 510, the first liquid-adding test tube 530, the second liquid-adding test tube 540, and the exhaust pipe 590 are all mounted on the first stopper of the distillation flask 520 and connected to the distillation flask 520. The funnel 510 is inserted into the assembly through hole and positioned by the support plate 110. The distillation flask 520 and the flask 560 are located below the support plate 110. A third liquid addition test tube 570 and an air inlet pipe 580 are both mounted on the second stopper of flask 560 and connected to flask 560. One end of the conducting tube 550 is connected to the first stopper and connected to the distillation flask 520, while the other end of the conducting tube 550 is connected to the second stopper and connected to flask 560. The port of the conducting tube 550 connected to the first stopper is higher than the port of the conducting tube 550 connected to the second stopper. Funnel 510 is used to receive the mixed liquid discharged from sample tube 001. Condenser 591 is sleeved onto the outer surface of the guide tube, forming an annular space between condenser 591 and conducting tube 550. Refrigerant can be passed into condenser 591, providing cooling energy to condense the gas flowing in conducting tube 550 into liquid.

[0070] It should be understood that the number of distillation mechanisms 500 is equal to the number of sample tubes 001 and corresponds one to one. The multiple distillation mechanisms 500 are arranged in a circle, and the flasks 560 of two adjacent distillation mechanisms 500 are alternately distributed on both sides to improve space utilization.

[0071] It should be noted that after the mixed liquid in sample tube 001 is flushed into the corresponding funnel 510, the mixed liquid enters the distillation flask 520. Then, the first liquid addition tube 530 is opened and a predetermined amount of octane is added to the distillation flask 520. Next, the valves on the first liquid addition tube 530 and the funnel 510 are closed, and nitrogen gas is connected to the inlet pipe 580 and flushed into the flask 560. The nitrogen gas displaces the air in the flask 560, the conducting tube 550, and the flask 560 through the exhaust pipe 590. Once the air is completely evacuated, the exhaust pipe 590 is closed. HCl is added to distilling flask 520 using second liquid addition tube 540. After addition, second liquid addition tube 540 is closed and distilling flask 520 is heated using heating mechanism 600. Hydrogen sulfide gas generated by the reaction in distilling flask 520 flows through conduit 550 to flask 560. Under the action of condenser 591, the hydrogen sulfide condenses into liquid and flows into flask 560. Then, a predetermined amount of hydrogen peroxide is added to flask 560, which already contains NaOH, using third liquid addition tube 570. Flask 560 is heated using heating mechanism 600. The sulfuric acid solution in flask 560 is generated by the reaction and then brought to a fixed volume for measurement. The remaining HCl digestion solution in distilling flask 520 is then filtered into a volumetric flask and brought to a fixed volume for measurement.

[0072] Please refer to Figure 10 Optionally, the heating mechanism 600 includes a first heating plate 610 and a second heating plate 620. Both the first heating plate 610 and the second heating plate 620 are connected to the bracket 100. The distillation flask 520 contacts the first heating plate 610, and the flask 560 contacts the second heating plate 620. The first heating plate 610 and the second heating plate 620 are independently controlled, which reduces energy consumption and facilitates temperature regulation. Furthermore, the height of the first heating plate 610 is higher than that of the second heating plate 620, so that the bottom of the distillation flask 520 is higher than the bottom of the flask 560.

[0073] The automated sulfur extraction device provided in this embodiment has a high degree of automation, high efficiency, minimal manual intervention, small errors, and high accuracy of experimental results.

[0074] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An automated extraction device for sulfur in soil samples, characterized in that: It comprises a support (100), a centrifugal mechanism (200), an oscillating mechanism (300), a liquid adding mechanism (400), a distilling mechanism (500) and a heating mechanism (600), wherein: The centrifugal mechanism (200) is mounted on the bracket (100), the oscillating mechanism (300) is mounted on the centrifugal mechanism (200), and the oscillating mechanism (300) is used to position the sample tube (001); the liquid adding mechanism (400) is mounted on the bracket (100), and the liquid adding mechanism (400) is used to add liquid into the sample tube (001); the distillation mechanism (500) is mounted on the heating mechanism (600), and the heating mechanism (600) is mounted on the bracket (100); The centrifugal mechanism (200) is used to drive the oscillating mechanism (300) to rotate, and the oscillating mechanism (300) is used to drive the sample tube (001) to vibrate; the liquid adding mechanism (400) is also used to use liquid to flush the mixed liquid in the sample tube (001) into the distillation mechanism (500); The oscillation mechanism (300) includes an elastic plate (310) and a vibration disk (320), wherein the elastic plate (310) is connected to the centrifugal mechanism (200) and is suspended in the air, and the vibration disk (320) is mounted on the elastic plate (310); a positioning through hole (311) for positioning the sample tube (001) is provided on the elastic plate (310); The liquid adding mechanism (400) includes a fixed plate (410), a lifting module (420), a peristaltic pump (430), a first liquid adding bottle (440) and a second liquid adding bottle (450); the fixed plate (410) is connected to the bracket (100); the lifting module (420), the first liquid adding bottle (440) and the second liquid adding bottle (450) are all installed on the fixed plate (410); the peristaltic pump (430) is connected to the telescopic end of the lifting module (420) and is used to drive the peristaltic pump (430) to rise or fall relative to the oscillation mechanism (300); and the peristaltic pump (430) can be inserted into the sample tube (001) during the descent process and suck the liquid in the sample tube (001) into a set container; The liquid adding mechanism (400) further comprises a sliding module (460) and a cleaning assembly (470), wherein the sliding module (460) is mounted on the fixed plate (410), and the lifting module (420) is mounted on the telescopic end of the sliding module (460), and the sliding module (460) is used to drive the lifting module (420) to slide in a direction perpendicular to the rotation axis of the oscillation mechanism (300) to adjust the position of the peristaltic pump (430) relative to the sample tube (001); the cleaning assembly (470) is mounted on the elastic plate (310), and the cleaning assembly (470) is used to provide cleaning liquid for cleaning the peristaltic pump (430); The elastic plate (310) is provided with an annular liquid collecting groove (312) surrounding the rotation axis, and a guide groove (331) is provided in the annular liquid collecting groove (312). The guide groove (331) is an arc-shaped groove extending around a preset axis, and the bottom wall of the guide groove (331) is provided as a guide inclined surface (332). The cleaning assembly (470) includes a liquid adding member, a support seat (471), a rotating arm (472), a sliding sleeve (473), a first cleaning test tube (474), a second cleaning test tube (475), a one-way valve (476) and an elastic member (477); the liquid adding member is mounted on the fixed plate (410); the support seat (471) is fixed in the annular liquid collecting tank (312); a water conveying channel (4721) is provided on the rotating arm (472), and the rotating arm (472) is rotatably mounted on the support seat (471) around the preset axis; the sliding sleeve (473) is connected to one end of the rotating arm (472), and the first cleaning test tube (474) is slidably inserted into the sliding sleeve (473) along the extension direction of the preset axis. 3), the bottom of the first cleaning test tube (474) contacts the guiding inclined surface (332); the first cleaning test tube (474) is provided with a drain port (4741), the second cleaning test tube (475) is provided with a water inlet (4751), the second cleaning test tube (475) is installed at the other end of the rotating arm (472), the drain port (4741) is connected to the water delivery channel (4721), and the water delivery channel (4721) is connected to the water inlet (4751); the one-way valve (476) is installed at the water inlet (4751), and the one-way valve (476) only allows the fluid in the water delivery channel (4721) to flow into the second cleaning test tube (475) through the water inlet (4751); The elastic member (477) is installed in the guide groove (331), and the elastic member (477) is in contact with the groove wall of the guide groove (331) and the first cleaning test tube (474) at the same time. The elastic member (477) is used to make the first cleaning test tube (474) have a tendency to slide along the upward slope of the guide slope (332); The peristaltic pump (430) has a first pipe opening (431) and a second pipe opening (432) that are connected; when the first pipe opening (431) is connected to the first cleaning test tube (474), the second pipe opening (432) and the second cleaning test tube (475) have a spacing in the circumferential direction of the rotating arm (472); when the first pipe opening (431) and the first cleaning test tube (474) have a spacing in the circumferential direction of the rotating arm (472), the second pipe opening (432) is connected to the second cleaning test tube (475).

2. The automated sulfur extraction device in soil samples according to claim 1, characterized in that: The bracket (100) comprises a support plate (110), support legs (120) and a support frame (130); the support legs (120) and the support frame (130) are both fixed to the support plate (110); the centrifugal mechanism (200) is mounted on the support frame (130); and the heating mechanism (600) is mounted on the support legs (120).

3. The automated sulfur extraction device in soil samples according to claim 1, characterized in that: The number of the vibration disks (320) is plural and they are arranged at intervals in the circumferential direction of the elastic plate (310).

4. The automated extraction device for sulfur in soil samples according to any one of claims 1 to 3, characterized in that: The distillation mechanism (500) comprises a funnel (510), a distillation flask (520), a first liquid-adding test tube (530), a second liquid-adding test tube (540), an exhaust pipe (590), a connecting pipe (550), a flask (560), a third liquid-adding test tube (570) and an air inlet pipe (580); the funnel (510), the first liquid-adding test tube (530), the second liquid-adding test tube (540) and the exhaust pipe (590) are all installed on the first stopper of the distillation flask (520) and are connected to the distillation flask (5 20); the third liquid-adding test tube (570) and the air inlet pipe (580) are both installed on the second stopper of the flask (560) and are connected to the flask (560); one end of the conducting tube (550) is connected to the first stopper and is connected to the distillation flask (520), and the other end of the conducting tube (550) is connected to the second stopper and is connected to the flask (560), and the port of the conducting tube (550) connected to the first stopper is higher than the port of the conducting tube (550) connected to the second stopper; The funnel (510) is used to receive the mixed liquid discharged from the sample tube (001).

5. The automated sulfur extraction device in soil samples according to claim 4, characterized in that: The distillation mechanism (500) further includes a condenser (591), which is sleeved on the outside of the conducting tube (550) and is used to condense the gas flowing in the conducting tube (550) into liquid.

6. The automated sulfur extraction device in soil samples according to claim 4, characterized in that: The heating mechanism (600) includes a first heating plate (610) and a second heating plate (620), wherein the first heating plate (610) and the second heating plate (620) are both connected to the bracket (100), the distillation flask (520) is in contact with the first heating plate (610), and the flask (560) is in contact with the second heating plate (620).

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