Soil organic matter detection device and method

Abstract

The present invention relates to the field of soil organic matter detection technology, and specifically to a soil organic matter detection device and method. The soil organic matter detection device includes a temperature control unit, a sample container, a condenser unit, a boiling detection unit, and a controller. The controller controls the heating temperature of the graphite heat transfer chamber by the temperature control unit and controls the temperature of the coolant in the condenser unit according to the inner floating plug height signal detected by the inner floating plug height detection device. According to the technical solution of the present invention, heat conduction is carried out through the graphite heat transfer chamber, which is more convenient and cleaner than an oil bath. The boiling state of the digested sample is quantified by the boiling detection unit, and the heating temperature and condensation temperature are automatically adjusted by the controller to control the boiling state in a stable state, effectively eliminating manual judgment errors, ensuring that the boiling state between different detection batches remains consistent, improving the consistency of the digestion conditions, and improving the detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of soil organic matter detection, and in particular to a soil organic matter detection device and method. Background Art

[0002] The agricultural industry standard NY / T 1121.6-2006 sets forth soil testing standards. Section 6 of this standard outlines a method for determining soil organic matter. The analytical steps include: inserting test tubes one by one into a wire cage, then lowering the cage into an oil bath heated on an electric stove to 185°C-190°C, ensuring the liquid level in the tubes is below the oil level. The oil bath temperature must drop to 170°C-180°C after insertion. The timing begins when the solution in the test tubes boils. The electric stove temperature must be controlled to prevent violent boiling. During this time, the cage can be gently lifted and shaken several times in the oil bath to even out the liquid temperature and maintain it at 170°C-180°C. After 5 minutes ± 0.5 minutes, the cage is removed from the oil bath, allowed to cool briefly, and the oil on the outside of the test tubes is wiped off.

[0003] In the above standards, the digestion time of the sample to be digested in the test tube is 5min±0.5min, and it needs to be maintained in a boiling state at 170℃-180℃. The solution must not boil violently, and the boiling degree needs to be manually determined. Different testers have different judgments on the boiling degree, which can easily cause deviations in the final test results and affect the accuracy of the test. Summary of the Invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention aims to provide a soil organic matter detection device and method.

[0005] To achieve the above-mentioned purpose, the present invention solves the technical problem by adopting the following technical solution: a soil organic matter detection device, comprising:

[0006] A temperature control unit comprising a heating element, a graphite heat transfer chamber, a heat dissipation mechanism, and a temperature sensor, wherein the heating element is used to supply heat to the graphite heat transfer chamber, the heat dissipation mechanism is used to dissipate heat from the graphite heat transfer chamber, and the temperature sensor is used to detect the wall temperature of the graphite heat transfer chamber;

[0007] A sample container, which is used to hold the sample liquid to be digested, and the sample container is placed in the graphite heat transfer chamber;

[0008] A condenser unit, comprising a condenser and a coolant supply mechanism, wherein the coolant supply mechanism provides coolant for the condenser;

[0009] A boiling detection unit includes a sleeve, an inner floating plug, and an inner floating plug height detection device. The sleeve is installed directly below the condenser tube. The inner floating plug is located inside the sleeve and can move up and down along the sleeve. The inner floating plug height detection device is used to detect the height position of the inner floating plug in the sleeve. As the inner floating plug moves upward along the sleeve, the gap between the inner floating plug and the sleeve gradually increases.

[0010] A controller controls the heating temperature of the graphite heat transfer chamber by the temperature control unit and the temperature of the coolant in the condenser unit according to the inner swimming plug height signal detected by the inner swimming plug height detection device.

[0011] The technical solution of the present invention uses a graphite heat transfer chamber for heat conduction, which is more convenient and cleaner than an oil bath. The boiling state of the digested sample is quantified by a boiling detection unit, and the heating temperature and condensation temperature are automatically adjusted by a controller to control the boiling state in a stable state, effectively eliminating manual judgment errors, ensuring that the boiling state between different test batches remains consistent, improving the consistency of digestion conditions, and enhancing detection accuracy.

[0012] Furthermore, the controller determines and monitors the coefficient of variation of the inner floating plug height, controls the temperature change rate of the graphite heat transfer chamber by the temperature control unit based on the change of the coefficient of variation, and controls the temperature change rate of the coolant in the condenser unit based on the change of the coefficient of variation.

[0013] The above preferred solution is adopted to improve the response speed and accuracy of temperature regulation, which helps to maintain a stable boiling state.

[0014] Furthermore, the lower half of the inner wall of the sleeve of the boiling detection unit is provided with a plurality of oblique guide ribs distributed in a circular array, and the lower plug body of the inner movable plug is provided with a guide groove, and the guide groove cooperates with the oblique guide ribs, and the oblique guide ribs gradually narrow from bottom to top.

[0015] The above-mentioned preferred solution can effectively regulate the axial movement of the inner movable plug. As the inner movable plug moves upward, the gap between the guide groove and the oblique guide rib gradually increases, and the transitional boiling water vapor can be dissipated upward in time and condensed and refluxed by the condenser to maintain a stable boiling state.

[0016] Furthermore, an adjusting gap is provided on the lower plug body of the inner movable plug for adjusting the radial depth of the guide groove.

[0017] By adopting the above preferred solution, the speed at which water vapor generated by boiling is radiated upward can be adjusted, thereby increasing the applicable range of the boiling detection unit.

[0018] Furthermore, the inner floating plug also includes a center rod extending upward from the center of the lower plug body, and a radial guide rib extending radially is provided in the middle position of the sleeve. The inner end surface of the radial guide rib cooperates with the outer periphery of the center rod, and the radial guide rib is provided with an overflow hole running through from top to bottom.

[0019] By adopting the above preferred solution, the axial movement stability of the inner floating plug is improved.

[0020] Furthermore, a counterweight portion is provided on the top of the central rod of the inner floating plug, and a plurality of ball grooves distributed in a circumferential array are provided on the counterweight portion, and counterweight balls are placed in the ball grooves.

[0021] By adopting the above preferred solution, the weight of the inner floating plug can be adjusted by the number of weighted balls, ensuring that the inner floating plug remains in a stable height range under normal boiling conditions.

[0022] Furthermore, during digestion, the wall temperature of the graphite heat transfer chamber is maintained at 170°C-180°C.

[0023] The above preferred solution is adopted to adapt to industry testing standards and ensure the accuracy of test results.

[0024] Furthermore, during digestion, the cooling liquid supply mechanism provides the cooling liquid to the condenser at a temperature of 4°C-50°C.

[0025] By adopting the above preferred solution, the condensation reflux rate is controlled and the boiling state is adjusted by adjusting the condensation temperature.

[0026] Furthermore, the sample container is a cylindrical quartz cup, and the graphite heat transfer chamber matches the outer contour of the sample container.

[0027] The above preferred solution is adopted to facilitate transfer and placement, and maintain good heat transfer performance.

[0028] A soil organic matter detection method comprises the following steps:

[0029] Step 1: Add the sample liquid into the sample container and place it in the graphite heat transfer chamber of the temperature control unit, and press the lower end of the sleeve of the boiling detection unit against the upper opening of the sample container;

[0030] Step 2: The graphite heat transfer chamber is heated to 180° C. by the heating element. After the inner movable plug moves upward, the temperature of the graphite heat transfer chamber is adjusted by the temperature control unit to fluctuate between 170° C. and 180° C., while the height of the inner movable plug fluctuates between h1 and h2, where h1 is less than h2.

[0031] Step 3: When the height of the inner floating plug exceeds h2, the temperature of the graphite heat transfer chamber is maintained at 170°C, and the temperature of the coolant in the condenser is lowered by the coolant supply mechanism. After the height of the inner floating plug is reduced to below h2, the current temperature of the coolant in the condenser is maintained; when the temperature of the coolant in the condenser is reduced to 4°C and the height of the inner floating plug exceeds h3, and the maintenance time exceeds 0.5 minutes, an alarm is issued.

[0032] The boiling state of the digested sample is quantified through the boiling detection unit, and the heating temperature and condensation temperature are automatically adjusted by the controller to control the boiling state in a stable state, effectively eliminating manual judgment errors, ensuring that the boiling state between different test batches remains consistent, improving the consistency of digestion conditions, and enhancing detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0035] Figure 2 is a top view of an embodiment of a boiling detection unit of the present invention;

[0036] Figure 3 yes Figure 2 Middle AA section;

[0037] Figure 4 yes Figure 3 Middle BB section view;

[0038] Figure 5 yes Figure 3 Middle CC section view;

[0039] Figure 6 、 Figure 7 This is a schematic diagram of the upward movement of the inner movable plug in the boiling detection unit;

[0040] Figure 8 This is a structural diagram of another embodiment of the inner movable plug;

[0041] Figure 9 It is a structural schematic diagram of another embodiment of the present invention.

[0042] The numbers and letters in the figure represent the names of the corresponding parts:

[0043] 10-temperature control unit; 11-graphite heat transfer chamber; 20-sample container; 30-condenser unit; 31-coolant inlet; 32-coolant outlet; 40-boiling detection unit; 41-sleeve; 411-oblique guide rib; 412-radial guide rib; 413-overflow hole; 42-inner floating plug; 421-lower plug body; 4211-guide groove; 4212-adjusting gap; 422-center rod; 423-counterweight; 424-counterweight ball; 43-inner floating plug height detection device; 50-cleaning mechanism; 60-lifting mechanism. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] like Figure 1-7 As shown, a soil organic matter detection device includes:

[0046] The temperature control unit 10 includes a heating element, a graphite heat transfer chamber 11, a heat dissipation mechanism, and a temperature sensor. The heating element is used to supply heat to the graphite heat transfer chamber, the heat dissipation mechanism is used to dissipate heat from the graphite heat transfer chamber, and the temperature sensor is used to detect the wall temperature of the graphite heat transfer chamber.

[0047] A sample container 20 is used to hold the sample solution to be digested. The sample container 20 is placed in the graphite heat transfer chamber 11;

[0048] The condenser unit 30 includes a condenser and a coolant supply mechanism, wherein the coolant supply mechanism provides coolant for the condenser;

[0049] The boiling detection unit 40 includes a sleeve 41, an inner floating plug 42, and an inner floating plug height detection device 43. The sleeve 41 is installed directly below the condenser tube. The inner floating plug 42 is located inside the sleeve 41 and can move up and down along the sleeve 41. The inner floating plug height detection device 43 is used to detect the height position of the inner floating plug 42 in the sleeve 41. As the inner floating plug 42 moves upward along the sleeve 41, the gap between the inner floating plug 42 and the sleeve 41 gradually increases.

[0050] The controller controls the heating temperature of the graphite heat transfer chamber 11 by the temperature control unit 10 and controls the temperature of the coolant in the condenser unit 30 according to the inner swimming plug height signal detected by the inner swimming plug height detection device 43.

[0051] The beneficial effects of adopting the above technical solution are: heat conduction is carried out through the graphite heat transfer chamber, which is more convenient and cleaner than an oil bath; the boiling state of the digested sample is quantified through the boiling detection unit, and the heating temperature and condensation temperature are automatically adjusted by the controller to control the boiling state in a stable state, effectively eliminating manual judgment errors, ensuring that the boiling state between different test batches remains consistent, improving the consistency of digestion conditions, and improving detection accuracy.

[0052] In other embodiments of the present invention, the controller determines and monitors the coefficient of variation of the inner floating plug height. Based on the change in the coefficient of variation, the controller controls the temperature change rate of the graphite heat transfer chamber by the temperature control unit. Furthermore, based on the change in the coefficient of variation, the controller controls the temperature change rate of the coolant in the condenser unit. This technical solution has the beneficial effect of improving the response speed and accuracy of temperature regulation and facilitating the stable maintenance of a boiling state.

[0053] In the present invention, the specific form of the heat dissipation mechanism of the temperature control unit 10 is not limited and can be selected from the existing technology, such as air cooling or liquid cooling.

[0054] In the present invention, the condenser is a double-layer tube structure including an inner tube and an outer tube. The inner tube has openings at the upper and lower ends. The outer tube surrounds the inner tube and its upper and lower ends are sealed with the outer wall of the inner tube. The coolant is passed into the space between the outer tube and the inner tube. Figure 1 As shown, the inlet at the lower end of the outer tube is the coolant inlet 31 , and the outlet at the upper end of the outer tube is the coolant outlet 32 ​​.

[0055] In the present invention, the inner floating stopper height detection device of the boiling detection unit is used to detect the height position of the inner floating stopper within the sleeve. The specific structural form of the inner floating stopper height detection device 43 is not limited and can be selected from existing technologies, such as a laser displacement ranging sensor. To improve the accuracy of displacement detection, a reflective coating can be applied to the circumference of the lower stopper body of the inner floating stopper to enhance its reflectivity.

[0056] like Figure 2-5 As shown, in other embodiments of the present invention, the lower half of the inner wall of the sleeve 41 of the boiling detection unit is provided with a plurality of oblique guide ribs 411 distributed along a circumferential array, and the lower plug body 421 of the inner floating plug is provided with a guide groove 4211, which cooperates with the oblique guide rib 411, and the oblique guide rib 411 gradually narrows from bottom to top. The beneficial effect of adopting the above technical solution is that it can effectively regulate the axial movement of the inner floating plug. Figure 6 As shown, the gap between the guide groove 4211 and the oblique guide rib 411 is S1. Figure 7As shown, the gap between the guide groove 4211 and the oblique guide rib 411 increases to S2. As the inner movable plug moves upward, the gap between the guide groove 4211 and the oblique guide rib 411 gradually increases, so that the transitional boiling water vapor can be dissipated upward in time and condensed and refluxed by the condenser to maintain a stable boiling state.

[0057] As shown in Figure 8, in some other embodiments of the present invention, an adjustment slot 4212 for adjusting the radial depth of the guide groove is provided on the lower plug body 421 of the inner movable plug. The beneficial effect of adopting the above technical solution is that it can adjust the speed of upward dissipation of water vapor generated by boiling, thereby increasing the applicability of the boiling detection unit.

[0058] like Figure 3 As shown, in other embodiments of the present invention, the inner floating plug 42 further includes a center rod 422 extending upward from the center of the lower plug body 421. A radial guide rib 412 extending radially is provided in the middle of the sleeve 41. The inner end surface of the radial guide rib 412 mates with the outer periphery of the center rod 422. The radial guide rib 412 is provided with an overflow hole 413 extending vertically therethrough. The above-described technical solution has the beneficial effect of improving the axial movement stability of the inner floating plug.

[0059] like Figure 2 、 3 As shown, in other embodiments of the present invention, a counterweight portion 423 is further provided at the top of the central rod of the inner floating plug 42. Counterweight portion 423 is provided with a plurality of ball grooves arranged in a circumferential array, and counterweight balls 424 are placed in these ball grooves. The advantageous effect of this technical solution is that the weight of the inner floating plug can be adjusted by adjusting the number of counterweight balls, ensuring that the inner floating plug remains at a stable height range during normal boiling conditions.

[0060] In other embodiments of the present invention, during digestion, the wall temperature of the graphite heat transfer chamber 11 is maintained at 170° C. to 180° C. This conforms to industry testing standards and ensures the accuracy of test results.

[0061] In other embodiments of the present invention, during digestion, the cooling liquid supply mechanism provides the cooling liquid to the condenser at a temperature of 4° C. to 50° C. By adjusting the condensation temperature, the condensation reflux rate is controlled and the boiling state is adjusted.

[0062] In other embodiments of the present invention, the sample container is a cylindrical quartz cup, which is convenient for transfer and placement. The graphite heat transfer chamber matches the outer contour of the sample container to maintain good heat transfer performance.

[0063] like Figure 9As shown, in some other embodiments of the present invention, a cleaning mechanism 50 for cleaning the inner tube of the condenser is further included. After the digestion is completed, the cleaning mechanism sprays cleaning liquid into the inner tube of the condenser to clean the attachments remaining on the inner tube wall of the condenser during the digestion process and return them to the sample container.

[0064] like Figure 9 As shown, in some other embodiments of the present invention, a lifting mechanism 60 is further included for lifting the condenser unit and the boiling detection unit. When the lifting mechanism descends, the condenser unit 30 and the boiling detection unit 40 move down to be sealed and docked with the sample container 20; when the lifting mechanism is lifted, the condenser unit 30 and the boiling detection unit 40 move up to be separated from the sample container 20.

[0065] A soil organic matter detection method comprises the following steps:

[0066] Step 1: Add the sample liquid into the sample container and place it in the graphite heat transfer chamber of the temperature control unit, and press the lower end of the sleeve of the boiling detection unit against the upper opening of the sample container;

[0067] Step 2: The graphite heat transfer chamber is heated to 180° C. by the heating element. After the inner movable plug moves upward, the temperature of the graphite heat transfer chamber is adjusted by the temperature control unit to fluctuate between 170° C. and 180° C., while the height of the inner movable plug fluctuates between h1 and h2, where h1 is less than h2.

[0068] Step 3: When the height of the inner floating plug exceeds h2, the temperature of the graphite heat transfer chamber is maintained at 170°C, and the temperature of the coolant in the condenser is lowered by the coolant supply mechanism. After the height of the inner floating plug is reduced to below h2, the current temperature of the coolant in the condenser is maintained; when the temperature of the coolant in the condenser is reduced to 4°C and the height of the inner floating plug exceeds h3, and the maintenance time exceeds 0.5 minutes, an alarm is issued.

[0069] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable ordinary technicians in this field to understand the content of the present invention and implement it. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A soil organic matter detection device, characterized in that: include: A temperature control unit comprising a heating element, a graphite heat transfer chamber, a heat dissipation mechanism, and a temperature sensor, wherein the heating element is used to supply heat to the graphite heat transfer chamber, the heat dissipation mechanism is used to dissipate heat from the graphite heat transfer chamber, and the temperature sensor is used to detect the wall temperature of the graphite heat transfer chamber; A sample container, which is used to hold the sample liquid to be digested, and the sample container is placed in the graphite heat transfer chamber; A condenser unit, comprising a condenser and a coolant supply mechanism, wherein the coolant supply mechanism provides coolant for the condenser; A boiling detection unit includes a sleeve, an inner floating plug, and an inner floating plug height detection device. The sleeve is installed directly below the condenser tube. The inner floating plug is located inside the sleeve and can move up and down along the sleeve. The inner floating plug height detection device is used to detect the height position of the inner floating plug in the sleeve. As the inner floating plug moves upward along the sleeve, the gap between the inner floating plug and the sleeve gradually increases. A controller controls the heating temperature of the graphite heat transfer chamber by the temperature control unit and the temperature of the coolant in the condenser unit according to the inner swimming plug height signal detected by the inner swimming plug height detection device.

2. The soil organic matter detection device according to claim 1, characterized in that: The controller determines and monitors the coefficient of variation of the inner floating plug height, controls the temperature change rate of the graphite heat transfer chamber by the temperature control unit based on the change of the coefficient of variation, and controls the temperature change rate of the coolant in the condenser unit based on the change of the coefficient of variation.

3. The soil organic matter detection device according to claim 1, characterized in that: The lower half of the inner wall of the sleeve of the boiling detection unit is provided with a plurality of oblique guide ribs distributed in a circumferential array, and the lower plug body of the inner movable plug is provided with a guide groove, which cooperates with the oblique guide ribs, and the oblique guide ribs gradually narrow from bottom to top.

4. The soil organic matter detection device according to claim 3, characterized in that: An adjusting gap for adjusting the radial depth of the guide groove is provided on the lower plug body of the inner movable plug.

5. The soil organic matter detection device according to claim 3, characterized in that: The inner floating plug also includes a center rod extending upward from the center of the lower plug body. A radial guide rib extending radially is provided in the middle position of the sleeve. The inner end surface of the radial guide rib cooperates with the outer periphery of the center rod. An overflow hole is provided on the radial guide rib that passes through the upper and lower parts.

6. The soil organic matter detection device according to claim 5, characterized in that: A counterweight portion is further provided on the top of the central rod of the inner floating plug. A plurality of ball grooves distributed in a circumferential array are provided on the counterweight portion, and counterweight balls are placed in the ball grooves.

7. The soil organic matter detection device according to claim 1, characterized in that: During digestion, the wall temperature of the graphite heat transfer chamber is maintained at 170℃-180℃.

8. The soil organic matter detection device according to claim 7, characterized in that: During digestion, the cooling liquid supply mechanism provides the cooling liquid at a temperature of 4° C. to 50° C. to the condenser.

9. The soil organic matter detection device according to claim 1, characterized in that: The sample container is a cylindrical quartz cup, and the graphite heat transfer chamber matches the outer contour of the sample container.

10. A soil organic matter detection method, characterized in that: The soil organic matter detection device according to any one of claims 1 to 9 comprises the following steps: Step 1: Add the sample liquid into the sample container and place it in the graphite heat transfer chamber of the temperature control unit, and press the lower end of the sleeve of the boiling detection unit against the upper opening of the sample container; Step 2: The graphite heat transfer chamber is heated to 180° C. by the heating element. After the inner movable plug moves upward, the temperature of the graphite heat transfer chamber is adjusted by the temperature control unit to fluctuate between 170° C. and 180° C., while the height of the inner movable plug fluctuates between h1 and h2, where h1 is less than h2. Step 3: When the height of the inner floating plug exceeds h2, the temperature of the graphite heat transfer chamber is maintained at 170°C, and the temperature of the coolant in the condenser is lowered by the coolant supply mechanism. After the height of the inner floating plug is reduced to below h2, the current temperature of the coolant in the condenser is maintained; when the temperature of the coolant in the condenser is reduced to 4°C and the height of the inner floating plug exceeds h3, and the maintenance time exceeds 0.5 minutes, an alarm is issued.

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