A system and method for determining the mass fraction of organic carbon in soil aggregates

Abstract

The application discloses a kind of soil aggregate organic carbon mass fraction determination system and method, comprising: heating device;Support, be equipped in heating device, it is equipped with guide rail device one, reagent adding piece one and push material piece on it, the sliding block of guide rail device one is connected with test tube piece;Guide rail device two, be equipped in heating device side wall, it is equipped with titration test piece and indicator adding piece on guide rail device two, the sliding block of guide rail device two is connected with receiving bottle.The application is driven by guide rail device one to move test tube piece to reagent adding piece one and add reagent, move to the heating end of heating device and heat, and move to push material piece and be driven by push material piece to unload test, and after unloading to receiving bottle, guide rail device two is driven to move receiving bottle and correspond to indicator adding piece and titration test piece in turn, reduce artificial operation intensity, improve determination work efficiency while effectively reducing human operation error.

Description

Technical Field

[0001] This invention relates to the field of soil aggregate organic carbon detection technology, specifically to a system and method for determining the mass fraction of organic carbon in soil aggregates. Background Technology

[0002] Soil aggregates are the basic units of soil structure and have a significant impact on soil fertility, water retention, and plant growth. Soil aggregates contain abundant organic carbon, and their mass fraction is one of the important indicators for measuring soil quality and health. Studies have found that soil aggregates become significantly more stable after the application of biogas slurry. Therefore, measuring the mass fraction of organic carbon in soil aggregates after biogas slurry application can not only provide a deeper understanding of the mechanism by which biogas slurry improves soil quality, but also provide a scientific basis for evaluating the effectiveness of biogas slurry as a soil conditioner. In addition, this research has profound significance for guiding the rational application of biogas slurry in agricultural production practices, optimizing soil management measures, enhancing soil carbon sequestration function, and promoting the virtuous cycle of agricultural ecosystems.

[0003] Currently, the determination of the organic carbon content in soil aggregates after the application of biogas slurry typically involves collecting and processing soil samples, followed by manual handling of the samples at various equipment for reagent addition, heating, and titration. The mass fraction of organic carbon in soil aggregates can be accurately calculated by recording the volume of standard solution consumed during titration, combined with the chemical reaction equation and the mass of the soil sample. However, this method is time-consuming, labor-intensive, and inefficient, and is prone to human error, affecting the accuracy of the results. Therefore, we propose a system and method for determining the mass fraction of organic carbon in soil aggregates. Summary of the Invention

[0004] The purpose of this invention is to provide a system and method for determining the mass fraction of organic carbon in soil aggregates, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A system for determining the mass fraction of organic carbon in soil aggregates, comprising:

[0007] Heating device;

[0008] A support is mounted on a heating device. It is equipped with a guide rail device, a reagent adding component, and a pusher. The slider of the guide rail device is connected to a test tube. The test tube is driven by the guide rail device to move to the reagent adding component to add reagent, to move to the heating end of the heating device, and to the pusher to unload the reagent.

[0009] The second guide rail device is located on the side wall of the heating device. The second guide rail device is equipped with a titration test piece and an indicator additive. The slider of the second guide rail device is connected to a receiving bottle corresponding to the pusher. After receiving the contents of the test tube, the receiving bottle is driven by the second guide rail device to move and correspond to the indicator additive and the titration test piece in sequence.

[0010] A further improvement is that the test tube includes:

[0011] The test tube body is hollow at both the top and bottom. Both sides of the lower end of the test tube body are hinged with sealing plates. An elastic element is also provided at the connection between the sealing plate and the test tube body to drive the sealing plate to close the lower end of the test tube body.

[0012] The movable plate is movably installed inside the test tube body, and its outer wall is detachably equipped with a sponge ring for cleaning the inner wall of the test tube body. The movable plate is connected to two sets of sealing plates by two sets of pull ropes, which are used to pull the two sets of sealing plates to flip open when the movable plate moves downward. The movable plate has an opening.

[0013] A further improvement is that the pusher component includes:

[0014] The telescopic device is mounted on a support frame, and its output end is equipped with a push plate for pushing the movable plate downward.

[0015] The funnel is connected to the heating device and is located below the pusher and above the receiving bottle.

[0016] A further improvement is that one end of the guide rail device is provided with a touch switch for contacting the test tube. The touch switch is electrically connected to the pusher. When the test tube contacts the touch switch, the test tube and the pusher are directly aligned.

[0017] One end of the guide rail device is provided with a second touch switch for contacting the receiving bottle. The second touch switch is electrically connected to the titration test piece. When the receiving bottle contacts the second touch switch, the receiving bottle and the titration test piece are directly aligned.

[0018] A further improvement is that the titration test specimen includes:

[0019] The feed seat has one end inserted into the bracket, and its outlet end is connected to a transparent burette. The outlet end of the transparent burette is connected to a guide shell. The bottom of the guide shell is provided with a liquid outlet pipe, and a solenoid valve is provided inside the liquid outlet pipe.

[0020] The turntable is rotatably mounted inside the guide housing, and its outer circumference has several sets of titration tanks. The turntable is driven to rotate by a rotating component mounted on the guide rail device 2, so that the titration tanks intermittently correspond to the discharge end or outlet pipe of the transparent burette.

[0021] A further improvement is that the turntable has a cavity, and the inner wall of the cavity is movably inserted with a number of sealing columns in a circular array. The number of sealing columns is half the number of titration tanks. One end of the sealing column extends into the titration tank. The side of the turntable away from the rotating part is rotatably connected to a pipeline, and the pipeline is connected to the input end of the induced draft device.

[0022] When gas is supplied to the cavity by the ventilation equipment and pipeline, the sealing column is driven by the gas to move and seal the titration tank. An elastic element is provided at the connection between the sealing column and the inner wall of the cavity. The elastic element is used to drive the sealing column to reset when the gas in the cavity is discharged.

[0023] A further improvement is that the rotating component includes:

[0024] The rotating device is supported on both sides of the guide rail device, and the output end of the rotating device is connected to the drive rod of the turntable through gear transmission.

[0025] A toothed gear, which is fitted onto the output end of a rotating device;

[0026] A transmission component is used to rotatably connect the receiving bottle and the guide rail device 2. When the guide rail device 2 drives the receiving bottle to move to a preset position, the transmission component meshes with a toothed gear, which drives the receiving bottle to shake.

[0027] A further improvement is that the side wall of the heating device is provided with an image acquisition device for collecting image data of the receiving bottle. The image acquisition device is electrically connected to a controller, and the controller is electrically connected to a solenoid valve, a rotating device, and a draft fan. When the image acquisition device acquires the first image data, the controller controls the draft fan to work. When the image acquisition device acquires the second image data, the controller controls the solenoid valve and the rotating device to close.

[0028] A further improvement is that the guide rail device is also equipped with an air-cooling device for cooling the test tube.

[0029] A method for determining the mass fraction of organic carbon in soil aggregates, utilizing the aforementioned determination system, includes the following steps:

[0030] S1: Take an appropriate amount of air-dried, crushed and sieved soil sample, and accurately weigh a certain amount into a test tube.

[0031] S2: The test tube is driven to the reagent adding part by the guide rail device, and the reagent is added to the test tube by the reagent adding part. Then, the test tube is driven to the heating end of the heating device by the guide rail device. After being heated by the heating device for a preset time, the test tube is driven to the pushing part by the guide rail device. The pushing part drives the unloading, and then the contents of the test tube enter the receiving bottle.

[0032] S3: The receiving bottle is moved sequentially to the indicator additive and titration test piece by the guide rail device. The indicator is added to the receiving bottle through the indicator additive, and the titration test piece titrates the standard solution in the receiving bottle until the titration endpoint is reached.

[0033] S4: When the titration endpoint is reached, the mass fraction of organic carbon in the soil aggregates is calculated and analyzed based on the volume of standard solution consumed during the titration process, the chemical reaction equation, and the mass of the soil sample.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] 1) After the soil sample is placed into the test tube, the present invention can move the test tube to the reagent addition point for adding reagents, move it to the heating end of the heating device for heating, and move it to the pusher point for unloading. After the contents of the test tube are unloaded into the receiving bottle, the receiving bottle can be moved by the guide rail device to correspond sequentially with the indicator addition point and the titration test point for measurement. This facilitates the subsequent calculation of the mass fraction of organic carbon in soil aggregates. This method eliminates the need for manual transfer between various devices, reduces the intensity of manual operation, improves the efficiency of measurement work, effectively reduces human operation error, and ensures the accuracy of the measurement results.

[0036] 2) The present invention uses a combination of test tube fittings and pusher fittings to facilitate the unloading of soil samples and reagents from the test tube body into the receiving bottle, effectively avoiding residue inside the test tube body.

[0037] 3) The titration test piece of the present invention can automatically and continuously add standard solutions to the receiving bottle, and monitor the color change of the solution in the receiving bottle during the titration process with an image acquisition device. Based on the color change, the titration speed of the titration test piece or the titration operation can be automatically controlled, which improves the titration accuracy and makes the whole measurement process more efficient and reliable. In addition, the receiving bottle is shaken during the titration process, which helps to eliminate local concentration differences and ensures that the reaction proceeds uniformly, making the titration results more real and reliable. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the measurement system of the present invention;

[0039] Figure 2 For the present invention Figure 1 Another perspective structural diagram;

[0040] Figure 3 This is a cross-sectional view of the test tube structure of the present invention;

[0041] Figure 4 This is a schematic diagram of the titration test piece structure of the present invention;

[0042] Figure 5 For the present invention Figure 4 A partial structural cross-sectional view.

[0043] In the diagram: 1. Heating device; 2. Support; 3. Guide rail device one; 4. Test tube fittings; 41. Test tube body; 42. Sealing plate; 43. Movable plate; 44. Sponge ring; 45. Pull rope; 5. Reagent additive; 6. Pushing component; 61. Telescopic device; 62. Push plate; 63. Funnel; 7. Touch switch one; 8. Air cooling device; 9. Guide rail device two; 10. Receiving bottle; 11. Indicator additive; 12. Titration test piece; 121. Feed seat; 122. Transparent burette; 123. Guide shell; 124. Liquid outlet pipe; 125. Rotating device; 126. Gear component; 127. Gear with missing tooth; 128. Exhaust fan device; 129. Turntable; 1210. Titration tank; 1211. Cavity; 1212. Sealing column; 13. Image acquisition device; 14. Touch switch two; 15. Transmission component. Detailed Implementation

[0044] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1

[0046] Please see the appendix Figure 1 -Appendix Figure 2 A system for determining the mass fraction of organic carbon in soil aggregates, comprising:

[0047] Heating device 1, for example, is an oil bath;

[0048] A support 2 is mounted on a heating device 1 and includes a guide rail device 3, a reagent additive 5, and a pusher 6. The slider of the guide rail device 3 is connected to a test tube 4. The guide rail device 3 includes, for example, a vertical electric guide rail assembly mounted on the support 2 and a horizontal electric guide rail assembly connected to the slider of the vertical electric guide rail assembly. The slider of the horizontal electric guide rail assembly can be detachably connected to the test tube 4 via a test tube rack. The test tube 4 is used to hold soil samples and solvents, etc. The reagent additive 5 includes a reagent container for storing reagents. There are at least two reagent containers, which respectively store K2Cr2O7 standard solution and concentrated sulfuric acid. The lower end of the reagent container is provided with a discharge pipe with a control valve inside.

[0049] The test tube 4 is driven by the guide rail device 3 to move to the reagent adding part 5 to add reagents, to move to the heating end of the heating device 1 for heating, and to the pusher 6 to unload the material. The specific usage is as follows: After the soil sample is placed in the test tube 4, the guide rail device 3 drives the test tube 4 to the reagent adding part 5. The reagent adding part 5 adds an appropriate amount of K2Cr2O7 standard solution and concentrated sulfuric acid into the test tube 4. Then the guide rail device 3 drives the test tube 4 downward until the test tube 4 enters the inner cavity of the heating end (located at the top of the heating device 1). The heating device 1 heats the test tube 4. After the heating time is preset, the guide rail device 3 drives the test tube 4 upward. Then the guide rail device 3 drives the test tube 4 to move to the pusher 6 and is directly opposite the pusher 6.

[0050] Guide rail device 2 9 is located on the side wall of heating device 1. Guide rail device 2 9 is equipped with titration test piece 12 and indicator additive 11. The slider of guide rail device 2 9 is connected to a receiving bottle 10 corresponding to the pusher 6. After receiving the contents of test tube 4, the receiving bottle 10 is driven by guide rail device 2 9 to move sequentially to correspond with indicator additive 11 and titration test piece 12. The aforementioned guide rail device 2 9 is, for example, a horizontally arranged electric guide rail assembly. The receiving bottle 10 is preferably a transparent triangular flask. The indicator additive 11 includes an indicator container storing the indicator. The bottom of the indicator container has a discharge pipe with a control valve. The indicator is o-phenanthroline indicator. The specific usage is as follows: The contents of test tube 4 (including soil sample, K2Cr2O7 standard solution, concentrated sulfuric acid, and...) The substance to be generated enters the receiving bottle 10 under the action of the pusher 6. The guide rail device 2 9 drives the receiving bottle 10 to the indicator adder 11. The indicator adder 11 adds an appropriate amount of indicator to the receiving bottle 10. Then the guide rail device 2 9 drives the receiving bottle 10 to the titration test piece 12. The titration test piece 12 titrates the FeSO4 standard solution into the receiving bottle 10 until the titration reaches the endpoint (when the color of the solution inside the receiving bottle 10 changes from orange-yellow through blue-green and light green to brownish-red, this is the titration endpoint). Based on the volume and concentration of the consumed FeSO4 standard solution, combined with the chemical reaction equation and the mass of the soil sample, the mass fraction of organic carbon in the sample can be calculated. This calculation method is a conventional technique in this field and will not be described in detail here.

[0051] Preferably, one end of the guide rail device 3 in this embodiment is provided with a touch switch 7 for contacting the test tube 4. The touch switch 7 is electrically connected to the pusher 6. When the test tube 4 contacts the touch switch 7, the test tube 4 and the pusher 6 are directly aligned. At this time, the pusher 6 works to push the contents of the test tube 4 downward to unload them.

[0052] One end of the guide rail device 13 is equipped with a touch switch 2 14 for contacting the receiving bottle 10. The touch switch 2 14 is electrically connected to the titration test piece 12. When the receiving bottle 10 is in contact with the touch switch 2 14, the receiving bottle 10 and the titration test piece 12 are directly aligned. At this time, the titration test piece 12 works to titrate FeSO4 standard solution into the receiving bottle 10.

[0053] The sample processing and testing process is automated by using touch switch 7 and touch switch 14, thereby improving overall efficiency.

[0054] Preferably, the guide rail device 3 in this embodiment is also provided with an air cooling device 8 for cooling the test tube 4. The air cooling device 8 is, for example, a fan bracket and a cold air fan. After the test tube 4 is heated by the heating device 1, it can be driven by the guide rail device 3 to move to the air cooling device 8 for cooling, thereby further improving the overall efficiency.

[0055] The method for determining the mass fraction of organic carbon in soil aggregates using the above-described measurement system includes the following steps:

[0056] S1: Take an appropriate amount of air-dried and pulverized soil sample and weigh a certain amount (e.g., 0.1-1g) into test tube 4;

[0057] S2: The test tube 4 is driven to the reagent adding part 5 by the guide rail device 3. The reagent adding part 5 adds reagent (such as 5ml of K2Cr2O7 standard solution and 5ml of concentrated sulfuric acid) to the test tube 4. Then, the test tube 4 is driven to the heating end of the heating device 1 by the guide rail device 3. After the heating device 1 heats for a preset time (the heating device 1 is preheated to 185-190℃, and after the test tube 4 is placed in, it is heated to 170-180℃ and boiled for 5 minutes), the test tube 4 is driven to the pusher part 6 by the guide rail device 3. The test tube 4 is then unloaded by the pusher part 6.

[0058] S3: The contents of the test tube 4 enter the receiving bottle 10. The receiving bottle 10 is driven by the guide rail device 2 9 to move sequentially to the indicator addition device 11 and the titration test piece 12. The indicator is added to the receiving bottle 10 through the indicator addition device 11, and the titration test piece 12 titrates the standard solution in the receiving bottle 10 until the titration endpoint.

[0059] S4: When the titration endpoint is reached, the mass fraction of soil organic carbon is calculated and analyzed based on the volume of standard solution consumed during the titration, the chemical reaction equation, and the mass of the soil sample. This is a conventional technique in this field and will not be described in detail here.

[0060] Example 2

[0061] Please see the appendix Figure 3Based on Example 1, the test tube 4 in this example includes:

[0062] The test tube body 41 is hollow at both the top and bottom. Both sides of the lower end of the test tube body 41 are hinged with sealing plates 42. The connection between the sealing plates 42 and the test tube body 41 is also provided with an elastic element (such as a spring) to drive the sealing plates 42 to close the lower end of the test tube body 41. In the initial state, the sealing plates 42 close the lower end of the test tube body 41, so that the soil sample, reagents, etc. inside the test tube body 41 will not seep out from the bottom.

[0063] The movable plate 43 is movably disposed inside the test tube body 41, and its outer wall is detachably provided with a sponge ring 44 for cleaning the inner wall of the test tube body 41. The sponge ring 44 can be snapped onto the movable plate 43. The movable plate 43 is connected to two sets of sealing plates 42 by two sets of pull ropes 45 respectively, which are used to pull the two sets of sealing plates 42 to flip open when the movable plate 43 moves downward. The movable plate 43 has an opening, and the outer wall of the test tube body 41, which is in the moving path of the pull ropes 45, also has a guide roller structure to guide the pull ropes 45.

[0064] Preferably, the pusher 6 in this embodiment includes:

[0065] Telescopic device 61 (e.g., electric telescopic pole) is mounted on bracket 2, and its output end is provided with push plate 62 for pushing movable plate 43 to move downward;

[0066] The funnel 63 is connected to the heating device 1 and is located below the pusher 6 and above the receiving bottle 10.

[0067] The specific usage is as follows: When the guide rail device 3 drives the test tube 4 to move to the position where the pusher 6 is directly aligned with the pusher 6, the telescopic device 61 drives the pusher plate 62 downward. The pusher plate 62 contacts the movable plate 43 downward. During the downward movement, the movable plate 43 cleans the outer wall of the test tube body 41 through the sponge ring 44 and causes the soil sample and reagent inside the test tube body 41 to move downward. At the same time, the movable plate 43 moves downward and pulls the two sets of sealing plates 42 synchronously to flip open through the pull rope 45, so that the soil sample and reagent inside the test tube body 41 move downward into the funnel 63, and then enter the receiving bottle 10 through the funnel 63.

[0068] Example 3

[0069] Please see the appendix Figure 4 Based on Example 1, the titration test piece 12 in this example includes:

[0070] The feed seat 121 is inserted into the bracket 2 at one end, and its outlet end is connected to the transparent burette 122. By adding FeSO4 standard solution into the feed seat 121, the FeSO4 standard solution can enter the transparent burette 122. The outer wall of the transparent burette 122 has graduation lines. The outlet end of the transparent burette 122 is connected to the guide shell 123. The guide shell 123 has a circular vertical cross section. The bottom of the guide shell 123 is provided with a liquid outlet pipe 124, and a solenoid valve is provided in the liquid outlet pipe 124.

[0071] The turntable 129 is rotatably mounted inside the guide shell 123. Several sets of titration tanks 1210 are opened on its outer circumference. The turntable 129 is driven to rotate by a rotating component mounted on the guide rail device 2 9, so that the titration tanks 1210 intermittently correspond to the discharge end or the liquid outlet pipe 124 of the transparent burette 122. In use, the turntable 129 is driven to rotate by the rotating component. The rotation of the turntable 129 causes the titration tanks 1210 to intermittently correspond to the discharge end or the liquid outlet pipe 124, so that a quantitative amount of FeSO4 standard solution is titrated downward into the receiving bottle 10. When the titration reaches the endpoint, the solenoid valve can be closed.

[0072] Example 4

[0073] Please see the appendix Figure 5 Based on Embodiment 3, in this embodiment, a cavity 1211 is provided inside the turntable 129. Several sets of sealing columns 1212 are movably inserted in a ring array on the inner wall of the cavity 1211. The number of sealing columns 1212 is half the number of titration tanks 1210. If there are six sets of titration tanks 1210, then there are three sets of sealing columns 1212. One end of the sealing column 1212 extends into the titration tank 1210. A pipeline is rotatably connected to the side of the turntable 129 away from the rotating part. One end of the pipeline is connected to the center of the guide shell 123. It is connected to the center of the turntable 129 through a bearing. The pipeline is connected to the input end of the induced draft device 128 (e.g., a fan). The pipeline may have an exhaust branch with a valve to open and discharge the gas in the cavity 1211.

[0074] When gas is supplied to the cavity 1211 by the induced draft device 128 and the pipeline, the sealing column 1212 is driven by the gas to move and seal the titration tank 1210. An elastic element is provided at the connection between the sealing column 1212 and the inner wall of the cavity 1211. The elastic element is used to drive the sealing column 1212 to reset when the gas in the cavity 1211 is discharged. When the titration is about to reach the endpoint, the user can supply gas to the cavity 1211 by opening the induced draft device 128, so that the sealing column 1212 seals part of the titration tank 1210, reducing the number of titration tanks 1210, thereby reducing the titration speed of FeSO4 standard solution, and thus facilitating accurate control of the solenoid valve to close at the titration endpoint.

[0075] Example 5

[0076] Please see the appendix Figure 4 -Appendix Figure 5 Based on embodiments three and four, the rotating component in this embodiment includes:

[0077] The rotating device 125 (including a motor and a reducer) is mounted on the side wall of the guide rail device 2 9 via a support frame. The output end of the rotating device 125 is connected to the drive rod of the turntable 129 via a gear component 126. The gear component 126 consists of two sets of meshing gears.

[0078] A toothed gear 127 is fitted onto the output end of the rotating device 125;

[0079] The transmission component 15 is used to rotatably connect the receiving bottle 10 and the guide rail device 2 9. The transmission component 15 includes a rotating shaft, a gear, and a torsion spring. The rotating shaft rotatably connects the receiving bottle 10 and the slider of the guide rail device 2 9. The gear is located at one end of the rotating shaft, and the torsion spring connects the rotating shaft and the slider of the guide rail device 2 9. When the guide rail device 2 9 drives the receiving bottle 10 to move to a preset position, the transmission component 15 meshes with the toothed gear 127, which drives the receiving bottle 10 to shake.

[0080] After the receiving bottle 10 is moved to the titration test piece 12, the rotating device 125 is turned on. The rotating device 125 causes the titration test piece 12 to work and also causes the toothed gear 127 to rotate. The toothed gear 127 intermittently drives the gear, the gear drives the rotating shaft, and the rotating shaft drives the receiving bottle 10 to rotate. When the toothed gear 127 separates from the gear, the rotating shaft drives the receiving bottle 10 to reset under the action of the torsion spring, thereby causing the receiving bottle 10 to shake. It should be noted that the shaking of the receiving bottle 10 is small, while the diameter of the receiving port is large, so that its receiving port can always receive the FeSO4 standard solution titrated by the titration test piece 12. At the same time, the receiving bottle 10 shakes to ensure that the reaction proceeds uniformly.

[0081] Example 6

[0082] Please see the appendix Figure 4 -Appendix Figure 5Based on embodiments three and four, the heating device 1 in this embodiment is provided with an image acquisition device 13 for acquiring image data of the receiving bottle 10 on its side wall. The image acquisition device 13 is, for example, a camera. The image acquisition device 13 is electrically connected to a controller. The controller analyzes and processes the image data of the receiving bottle 10 acquired by the image acquisition device 13. Specifically, the controller can compare the acquired image data of the receiving bottle 10 with the first image data and the second image data stored in the database in advance. Currently, during titration, the color of the solution in the receiving bottle 10 usually changes from orange-yellow through green, green to brownish-red (or changes depending on the indicator). Therefore, the first image data of the receiving bottle 10 stored in the database in advance is that the solution in the receiving bottle 10 is green, and the second image data is that the solution in the receiving bottle 10 is brownish-red.

[0083] The controller is electrically connected to the solenoid valve, the rotating device 125 and the induced draft device 128. When the image acquisition device 13 acquires the first image data, the controller controls the induced draft device 128 to work. That is, after the solution color in the receiving bottle 10 turns green, the controller controls the induced draft device 128 to work to reduce the titration speed.

[0084] When the image acquisition device 13 acquires the second image data, the controller controls the solenoid valve and the rotating device 125 to close, that is, when the color of the solution in the receiving bottle 10 turns red, the titration stops.

[0085] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A system for determining the mass fraction of organic carbon in soil aggregates, characterized in that, include: Heating device (1); A support (2) is provided on a heating device (1), and a guide rail device (3), a reagent adder (5) and a pusher (6) are provided on it. The slider of the guide rail device (3) is connected to a test tube (4). The test tube (4) is driven by the guide rail device (3) to move to the reagent adder (5) to add reagent, to move to the heating end of the heating device (1) for heating, and to move to the pusher (6) to discharge the material. The second guide rail device (9) is located on the side wall of the heating device (1). The second guide rail device (9) is equipped with a titration test piece (12) and an indicator additive piece (11). The slider of the second guide rail device (9) is connected to a receiving bottle (10) corresponding to the pusher piece (6). After receiving the contents of the test tube piece (4), the receiving bottle (10) is driven by the second guide rail device (9) to move and correspond to the indicator additive piece (11) and the titration test piece (12) in sequence. The titration test piece (12) includes: a feed seat (121), one end of which is inserted into the bracket (2), and its discharge end is connected to a transparent burette (122). The discharge end of the transparent burette (122) is connected to a guide shell (123). The bottom of the guide shell (123) is provided with a liquid outlet pipe (124), and a solenoid valve is provided in the liquid outlet pipe (124); a turntable (129), which is rotatably disposed in the guide shell (123). Several sets of titration tanks (1210) are opened on its outer circumference. The turntable (129) is driven to rotate by a rotating component disposed on the guide rail device (9) so that the titration tanks (1210) intermittently correspond to the discharge end of the transparent burette (122) or the liquid outlet pipe (124); The turntable (129) has a cavity (1211) inside. The inner wall of the cavity (1211) is movably inserted with a number of sealing columns (1212) in a ring array. The number of sealing columns (1212) is half the number of titration tanks (1210). One end of the sealing column (1212) extends into the titration tank (1210). The side of the turntable (129) away from the rotating part is rotatably connected to a pipeline, and the pipeline is connected to the input end of the induced draft device (128). When the induced draft device (128) and pipeline supply gas to the cavity (1211), the sealing column (1212) is driven by the gas to move and close the titration tank (1210). An elastic element is provided at the connection between the sealing column (1212) and the inner wall of the cavity (1211). The elastic element is used to drive the sealing column (1212) to reset when the gas in the cavity (1211) is discharged.

2. The measuring system according to claim 1, characterized in that: The test tube (4) includes: The test tube body (41) is hollow at both the top and bottom. Both sides of the lower end of the test tube body (41) are hinged with sealing plates (42). The connection between the sealing plates (42) and the test tube body (41) is also provided with elastic elements to drive the sealing plates (42) to close the lower end of the test tube body (41). The movable plate (43) is movably disposed inside the test tube body (41), and its outer wall is detachably provided with a sponge ring (44) for cleaning the inner wall of the test tube body (41). The movable plate (43) is connected to two sets of sealing plates (42) by two sets of pull ropes (45) respectively, which are used to pull the two sets of sealing plates (42) to flip open when the movable plate (43) moves downward. The movable plate (43) is provided with an opening.

3. The measuring system according to claim 2, characterized in that: The pusher (6) includes: Telescopic device (61) is mounted on bracket (2), and its output end is provided with push plate (62) for pushing movable plate (43) to move downward; The funnel (63) is connected to the heating device (1) and is located below the pusher (6) and above the receiving bottle (10).

4. The measuring system according to claim 1, characterized in that: One end of the guide rail device (3) is provided with a touch switch (7) for contacting the test tube (4). The touch switch (7) is electrically connected to the pusher (6). When the test tube (4) contacts the touch switch (7), the test tube (4) and the pusher (6) are directly aligned. One end of the guide rail device (3) is provided with a second touch switch (14) for contacting the receiving bottle (10). The second touch switch (14) is electrically connected to the titration test piece (12). When the receiving bottle (10) is in contact with the second touch switch (14), the receiving bottle (10) and the titration test piece (12) are directly aligned.

5. The measuring system according to claim 1, characterized in that: The rotating component includes: The rotating device (125) is mounted on the side wall of the guide rail device (9) by a support frame. The output end of the rotating device (125) is connected to the drive rod of the turntable (129) through a gear (126). A toothed gear (127) is fitted onto the output end of the rotating device (125); The transmission component (15) is used to rotatably connect the receiving bottle (10) and the guide rail device (9). When the guide rail device (9) drives the receiving bottle (10) to move to the preset position, the transmission component (15) meshes with the toothed gear (127), and the toothed gear (127) drives the receiving bottle (10) to shake.

6. The measuring system according to claim 5, characterized in that: The heating device (1) has an image acquisition device (13) on its side wall for acquiring image data of the receiving bottle (10). The image acquisition device (13) is electrically connected to a controller. The controller is electrically connected to a solenoid valve, a rotating device (125), and a draft device (128). When the image acquisition device (13) acquires the first image data, the controller controls the draft device (128) to work. When the image acquisition device (13) acquires the second image data, the controller controls the solenoid valve and the rotating device (125) to close.

7. The measuring system according to claim 1, characterized in that: The guide rail device (3) is also equipped with an air-cooling device (8) for cooling the test tube (4).

8. A method for determining the mass fraction of organic carbon in soil aggregates, using the determination system as described in any one of claims 1-7, characterized in that: Includes the following steps: S1: Take an appropriate amount of air-dried and crushed soil sample and sieve it, and accurately weigh a certain amount into test tube (4); S2: Drive the test tube (4) to the reagent adder (5) via the guide rail device (3), add reagent to the test tube (4) via the reagent adder (5), and then drive the test tube (4) to the heating end of the heating device (1) via the guide rail device (3). After heating for a preset time via the heating device (1), drive the test tube (4) to move away from the heating device (1) via the guide rail device (3) to the pusher (6), and then drive the unloading via the pusher (6), so that the contents of the test tube (4) enter the receiving bottle (10). S3: Drive the receiving bottle (10) to the indicator additive (11) and the titration test piece (12) in sequence through the guide rail device (9). Add indicator to the receiving bottle (10) through the indicator additive (11) and titrate the standard solution in the receiving bottle (10) through the titration test piece (12) until the titration endpoint. S4: When the titration endpoint is reached, the mass fraction of organic carbon in the soil aggregates is calculated and analyzed based on the volume of standard solution consumed during the titration process, the chemical reaction equation, and the mass of the soil sample.

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