Semi-automatic soil organic matter measuring device

Abstract

The utility model discloses a semi-automatic soil organic matter measuring device which comprises a body, a first groove and a second groove which are communicated are formed in the body, and a controller capable of controlling a heating resistor, a liquid storage mechanism, an electronic scale, a stirring mechanism, a titration mechanism and a color sensing mechanism is installed on the body. According to the scheme, the controller is used for realizing the preparation of the liquid to be measured and the semi-automatic operation of the subsequent titration experiment when the organic matter is measured. According to the scheme, through the structure, the liquid preparation step of the organic matter liquid to be measured is simplified, errors caused when the liquid to be measured is transferred are reduced, and accurate state judgment and accurate and efficient addition of a titration auxiliary agent are achieved through the color sensing mechanism in subsequent titration operation.

Description

Technical Field

[0001] The utility model relates to a device for measuring soil organic matter, in particular to a semi-automatic device for measuring soil organic matter. Background Technique

[0002] As a conventional experimental method for measuring soil organic matter, the external heating method of potassium dichromate oxidation requires, during the experimental operation, first putting the soil to be measured into a glass test tube, successively adding potassium dichromate and concentrated sulfuric acid, then putting the glass test tube into an oil bath for heating, controlling the oil bath temperature at 170 - 180 °C, continuously heating for 5 minutes, and finally transferring the liquid in the oil-bathed glass test tube to a conical flask, adding o-phenanthroline indicator, and manually titrating with ammonium ferrous sulfate solution. In the conventional test method, there is an operation of transferring the liquid to be measured. If the liquid transfer is not clean, it will cause experimental errors. In terms of manual titration, due to the color difference problem in the control of the titration end point by different experimenters, it will also affect the accuracy of the experiment. In addition, when the sample size is too large, the manual titration efficiency is low. Content of the Utility Model

[0003] The purpose of the utility model is to provide a semi-automatic device for measuring soil organic matter to simplify the operation of measuring soil organic matter and improve the accuracy of measuring soil organic matter.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A semi-automatic device for measuring soil organic matter, comprising

[0006] A main body, on which a first groove and a second groove are provided, and the bottoms of the first groove and the second groove are connected through a flow channel;

[0007] A controller, arranged on the upper surface of the main body;

[0008] A heating resistor, arranged in the first groove and electrically connected to the controller;

[0009] A liquid storage mechanism, arranged in the second groove and connected to the first groove through a flow channel, and the liquid storage mechanism is electrically connected to the controller;

[0010] An electronic scale, arranged on the main body and electrically connected to the controller, and the electronic scale has a measuring arm extending into the first groove;

[0011] A reaction dish, placed on the measuring arm and with the bottom extending down to the bottom of the first groove;

[0012] A bracket, rotatably connected to the main body and having a cross beam horizontally extending and suspended above the first groove;

[0013] A stirring mechanism is arranged on the crossbeam of the bracket and is in telecommunication connection with the controller. When measuring organic matter, it extends into the solution in the reaction dish.

[0014] A titration mechanism, there are two groups of the titration mechanisms, and they are respectively in telecommunication connection with the controller. The titration mechanism is arranged on the crossbeam of the bracket. When measuring organic matter, it descends to be close to the liquid level of the solution in the reaction dish.

[0015] A color sensing mechanism is arranged on the crossbeam of the bracket and is in electrical signal connection with the controller. When measuring organic matter, the color sensing mechanism descends to be close to the liquid level of the solution in the reaction dish.

[0016] Preferably, the liquid storage mechanism includes a pump body and a first liquid storage tank. The pump body is connected to one end of the flow channel, the first liquid storage tank is communicated with the pump body, and a cross valve flap is further arranged on the first liquid storage tank.

[0017] Preferably, the front end of the measuring arm is annular. After the bottom of the reaction dish passes through the measuring arm, it is placed on the measuring arm.

[0018] Preferably, the stirring mechanism includes a motor vertically installed on the crossbeam. The motor is electrically connected to the controller. A connecting rod one with a polygonal cross-section passes through the rotating shaft of the motor with damping, and a stirring paddle is connected to the lower end of the connecting rod one.

[0019] Preferably, the titration mechanism includes a second liquid storage tank fixedly installed on the bracket. A metering pump is arranged on the second liquid storage tank. The metering pump is electrically connected to the controller. A titration tube is connected to the liquid outlet of the metering pump. The liquid outlet end of the titration tube is a flexible tube. A connecting rod two is vertically inserted on the crossbeam. There is damping between the connecting rod two and the bracket, and the connecting rod two is connected to the liquid outlet end of the titration tube.

[0020] Preferably, the color sensing mechanism includes a connecting rod three vertically inserted on the crossbeam. There is damping between the connecting rod three and the crossbeam. A color analyzer is installed at the lower end of the connecting rod three, and the color analyzer is electrically connected to the controller.

[0021] Preferably, the connecting rod two and the connecting rod three are synchronously connected by a cross bar.

[0022] Compared with the prior art, the beneficial effects of the present utility model are:

[0023] First, the quantitative configuration, stirring, and titration of the liquid to be measured in this solution are all carried out in a reaction dish, reducing the operation of transferring the liquid to be measured in the existing organic matter determination process. This not only simplifies the steps but also effectively reduces the errors caused by the transfer of the liquid to be measured. Second, the titration operation in this solution judges the color change during titration through a color analyzer, which has higher accuracy compared to visual experience judgment. Finally, the addition of the titration aid in this solution is pumped out by a metering pump, which has higher efficiency and accuracy compared to manual titration with a burette. Brief Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the present utility model;

[0025] Figure 2 is a horizontal cross-sectional view of the present utility model;

[0026] Figure 3 is a longitudinal cross-sectional view of the present utility model;

[0027] Figure 4 is a control logic diagram of the present utility model.

[0028] Reference Numerals: 100. Body 110. First Tank 120. Second Tank 130. Flow Channel 200. Liquid Storage Mechanism 210. First Liquid Storage Tank 220. Pump Body 230. Cross Valve Flap 300. Titration Mechanism 310. Second Liquid Storage Tank 320. Metering Pump 330. Burette 340. Second Link 400. Controller 500. Heating Resistance 600. Reaction Dish 700. Bracket 800. Stirring Mechanism 810. Motor 820. First Link 830. Stirring Blade 900. Electronic Scale 1000. Color Sensing Mechanism 1010. Third Link 1020. Color Analyzer 1100. Cross Bar. Detailed Embodiments

[0029] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] As Figures 1 to 4 shown, a semi-automatic device for measuring soil organic matter includes a main body 100. A first groove 110 and a second groove 120 are formed in the main body. The bottom of the first groove and the second groove are connected through a flow channel 130 formed in the main body 100.

[0033] As Figure 2 shown, a heating resistor 500 is installed at the bottom of the first groove. By controlling the heating power of the heating resistor, the heat-conducting liquid in the first groove can be uniformly heated.

[0034] In the second groove 120, a set of liquid storage mechanisms 200 is installed. The liquid storage mechanism includes a pump body 220. The pump body has a two-way liquid delivery function, and the liquid inlet and outlet ends are connected to one end of the flow channel, so that the heat-conducting liquid can be delivered to the first groove or sucked out from the first groove through the pump body. As the storage unit of the heat-conducting liquid, a first liquid storage tank 210 is also provided in the second groove. The pump body is connected to the first liquid storage tank, and the heat-conducting liquid pumped out from the first groove by the pump body enters the first liquid storage tank. It should be noted that in order to ensure that the internal air pressure of the first liquid storage tank can remain stable when the heat-conducting liquid enters and exits, so as to facilitate the entry and exit of the liquid, a cross valve flap 230 is also installed on the top of the first liquid storage tank. Through the cross valve flap, timely adjustment can be made when the pressure in the first liquid storage tank increases or decreases.

[0035] It should be noted that during the determination of soil organic matter, it is necessary to first prepare the liquid to be measured, and thus it is necessary to accurately weigh the soil powder and the solution. For this purpose, an electronic scale 900 is also installed on the main body 100. Specifically, for the convenience of measurement and directly heating the prepared solution after weighing, the part of the electronic scale for placing the reaction vessel 600 is an arm extending into a groove. When the reaction vessel is placed on this arm, the electronic scale can accurately weigh the items on the arm. It should be noted that in this solution, for the convenience of subsequent heat bath of the liquid to be measured in the reaction vessel, the front end of the arm is a ring, and the bottom of the reaction vessel 600 can pass through the arm of this ring structure and then extend down to a position close to the bottom of the groove. At this time, the upper edge of the reaction vessel is placed on the beam arm to ensure the stability of the position.

[0036] Meanwhile, a bracket 700 is also installed on the main body. The lower end of the bracket is rotatably connected to the main body, and the upper part of the bracket is a horizontally extending cross beam. A stirring mechanism 800, a titration mechanism 300, and a color sensing mechanism 1000 are respectively installed on this cross beam.

[0037] Among them, the stirring mechanism includes a motor 810 installed on the cross beam of the bracket. The motor is vertically arranged and is a hollow shaft motor. A connecting rod 820 that can move axially is inserted into the hollow shaft of the motor, and a stirring paddle 830 is connected to the lower end of this connecting rod 820. It should be noted that in this solution, the reason why the connecting rod 820 is axially movable and inserted into the hollow shaft of the motor is to facilitate the placement of the reaction vessel 600 on the arm of the electronic scale and to add or subtract materials when preparing the liquid to be measured. Specifically, when it is necessary to prepare the liquid to be measured, the connecting rod 820 can be pulled up from the hollow shaft of the motor to prevent the lower end of the connecting rod 820 from hindering the placement of the reaction vessel on the arm. It should be noted that to ensure the stability of the upper and lower positions of the stirring paddle during stirring, the connecting rod 820 is inserted into the hollow shaft of the motor with damping, that is, when there is no pulling force from the axial force, the connecting rod will not move relative to the hollow shaft of the motor. At the same time, the cross section of the connecting rod 820 is polygonal to ensure that when the motor rotates, the rotating shaft will not rotate relative to the connecting rod 820. In addition, the motor in this solution is electrically connected to the controller 400 through a wire to ensure that the rotation of the motor is driven by the controller.

[0038] As shown in Figure 1, there are two sets of titration mechanisms 300, which are arranged symmetrically on the left and right sides of the bracket. In these two sets of titration mechanisms, one set is used to store orthophenanthroline indicator, and one set is used to store ammonium ferrous sulfate solution, so as to quantitatively drip the above reagents into the liquid to be measured in the reaction vessel during the titration operation. It should be noted that as Figure 3As shown in the figure, the titration mechanism in this solution includes a second liquid storage tank 310 fixedly installed on the bracket. A metering pump (preferably a peristaltic pump) is connected to the second liquid storage tank. The liquid outlet end of the metering pump 320 is connected to a burette 330. It should be noted that most of the burette is a rigid tube to ensure stability during operation, and the liquid outlet part at its front end is a hose part with a length of about 10 - 15 cm. The function of this hose part is to ensure that the liquid outlet end of the burette can be adjusted to rise or fall. Specifically, a second connecting rod 340 with damping is inserted on the crossbeam of the bracket 700, and the lower end of this second connecting rod is connected to the liquid outlet end of the burette, so as to adjust the height of the liquid outlet end of the burette by pulling the second connecting rod. It should be noted that in this solution, the determination of the titration amount of the auxiliary agent in the titration mechanism needs to be realized through the controller. Specifically, the controller is electrically connected to the metering pump in the titration mechanism through a wire, so as to drive the pumping amount of the metering pump through the controller.

[0039] In addition, in this solution, how to define whether the titration operation has been in place so that the titration mechanism 300 can drip an accurate amount of titration reagent into the solution to be measured can be achieved by installing a color sensing mechanism 1000 on the crossbeam of the bracket to accurately judge the color change of the solution to be measured during the titration experiment. Specifically, this color sensing mechanism includes a third connecting rod 1010 with damping inserted into the crossbeam. A miniature color analyzer 1020 is installed at the lower end of this third connecting rod. The color analyzer is electrically connected to the controller through a wire. When the color of the indicator in the solution to be measured changes, the color analyzer makes a judgment and sends a relevant signal to the controller to provide a driving signal for the controller to start and stop the metering pump in the titration mechanism.

[0040] It should be noted that in this solution, there is a high degree of consistency between the titration experiment implemented by the titration mechanism and the color judgment performed by the color sensing mechanism. Therefore, to simplify the operation, the titration mechanism and the color sensing mechanism can be made to move synchronously, that is, the third connecting rod 1010 and the second connecting rod 340 can be synchronously lifted and lowered through a crossbar 1100 connected to both of them at the same time.

[0041] Working principle: When it is necessary to determine the organic matter content in the soil by the external heating method of potassium dichromate oxidation, this solution is realized through the following steps.

[0042] 1. Synchronously lift the first connecting rod in the stirring mechanism, the second connecting rod in the titration mechanism, and the third connecting rod in the color sensing mechanism. Then rotate the bracket so that the stirring mechanism, the titration mechanism, and the color sensing mechanism are turned over from a tank.

[0043] 2. Place the reaction vessel in the measuring arm of the electronic scale, and then zero the electronic scale through the controller.

[0044] 3. First, add the required mass of air-dried powdered soil sample into the reaction dish, and then add a certain amount of potassium dichromate standard solution and sulfuric acid into the reaction dish.

[0045] 4. After turning the bracket back, press down the connecting rod in the stirring mechanism so that the stirring paddle extends down into the liquid to be measured in the reaction dish. Then, drive the motor to rotate through the controller, so as to fully mix the soil powder sample with the potassium dichromate standard solution and sulfuric acid.

[0046] 5. Drive the pump body in the liquid storage mechanism to work through the controller. The pump body pumps the heat-conducting liquid in the first liquid storage tank into the first tank so that the heat-conducting liquid covers at least 2 / 3 of the height of the liquid level to be measured. At this time, the stirring mechanism maintains stirring, and the controller drives the heating resistor to work so that the temperature of the heat-conducting liquid rises and is maintained at 170 - 180 °C, and the solution in the reaction dish is oil-bathed for 5 minutes.

[0047] 6. After the time is up, the controller drives the pump body to rotate in the reverse direction to suck the heat-conducting liquid in the first tank back into the first liquid storage tank. At the same time, the heating resistor and the stirring mechanism are turned off through the controller, and the liquid to be measured stands still and cools for a period of time.

[0048] 7. Subsequently, press down the second connecting rod and the third connecting rod so that the liquid outlet end of the burette of the titration mechanism and the color analyzer of the color sensing mechanism are close to the liquid level of the liquid to be measured. Then, the controller drives the titration mechanism storing the phenanthroline indicator to drip a quantitative indicator into the solution to be measured, and then controls the titration mechanism storing the ammonium ferrous sulfate standard solution to continuously drip the ammonium ferrous sulfate solution into the solution to be measured. During this period, the controller drives the motor in the stirring mechanism to rotate slowly so that the two titration liquids can be fully mixed and reacted with the liquid to be measured.

[0049] 8. During the titration, the color sensing mechanism analyzes and judges the color of the liquid to be measured. When the color of the solution to be measured changes significantly (such as from orange-yellow through blue-green to brown-red), record the volume of ammonium ferrous sulfate consumed.

[0050] 9. Calculate the contents of soil organic carbon and organic matter according to parameters such as the volume of ammonium ferrous sulfate consumed, the volume consumed in the blank test, and the concentration of the potassium dichromate standard solution.

[0051] In this solution, whether it is the preparation of the liquid to be measured or the subsequent titration, the semi-automatic auxiliary operation can be realized with the help of electronic equipment, which greatly improves the convenience and accuracy of soil organic matter determination.

[0052] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A semi-automatic device for measuring soil organic matter, characterized in that: including a main body (100) with a first groove (110) and a second groove (120) formed thereon, and the bottoms of the first groove (110) and the second groove (120) are connected through a flow channel (130); a controller (400) disposed on the upper surface of the main body (100); a heating resistor (500) disposed in the first groove (110) and electrically connected to the controller (400); a liquid storage mechanism (200) disposed in the second groove (120) and connected to the first groove (110) through the flow channel (130), and the liquid storage mechanism (200) is electrically connected to the controller (400); an electronic scale (900) disposed on the main body (100) and electrically connected to the controller (400), and the electronic scale (900) has a measuring arm extending into the first groove (110); a reaction vessel (600) placed on the measuring arm and with its bottom extending down to the bottom of the first groove (110); a bracket (700) rotatably connected to the main body (100) and having a crossbeam horizontally extending and suspended above the first groove (110); a stirring mechanism (800) disposed on the crossbeam of the bracket (700) and in telecommunication connection with the controller (400), and when measuring organic matter, it extends into the solution in the reaction vessel (600); a titration mechanism (300) having two sets and respectively in telecommunication connection with the controller (400), the titration mechanism (300) is disposed on the crossbeam of the bracket (700), and when measuring organic matter, it extends down to be close to the liquid level of the solution in the reaction vessel (600); a color sensing mechanism (1000) disposed on the crossbeam of the bracket (700) and in electrical signal connection with the controller (400), and when measuring organic matter, the color sensing mechanism (1000) extends down to be close to the liquid level of the solution in the reaction vessel (600).

2. The semi - automated soil organic matter determination device according to claim 1, wherein: The liquid storage mechanism (200) includes a pump body (220) and a first liquid storage tank (210), the pump body (220) is connected to one end of the flow channel (130), the first liquid storage tank (210) is communicated with the pump body (220), and a cross valve flap (230) is further disposed on the first liquid storage tank (210).

3. The semi-automated soil organic matter determination device according to claim 1, characterized in that: The front end of the measuring arm is annular, and after the bottom of the reaction vessel (600) passes through the measuring arm, it is mounted on the measuring arm.

4. A semi-automated soil organic matter determination device according to claim 1, characterized in that: The stirring mechanism (800) includes a motor (810) vertically mounted on the crossbeam, the motor (810) is electrically connected to the controller (400), a connecting rod one (820) with a polygonal cross-section is disposed through the rotating shaft of the motor (810) with damping, and a stirring paddle (830) is connected to the lower end of the connecting rod one (820).

5. A semi-automatic soil organic matter determination device according to claim 1, characterized in that: The titration mechanism (300) includes a second liquid storage tank (310) fixedly installed on the support (700). A metering pump (320) is arranged on the second liquid storage tank (310). The metering pump (320) is electrically connected to the controller (400). A burette (330) is connected to the liquid outlet of the metering pump (320). The liquid outlet end of the burette (330) is a flexible hose. A second connecting rod (340) is vertically inserted on the cross beam. There is damping between the second connecting rod (340) and the support (700), and the second connecting rod (340) is connected to the liquid outlet end of the burette (330).

6. The semi - automated soil organic matter determination device according to claim 5, characterized in that: The color sensing mechanism (1000) includes a third connecting rod (1010) vertically inserted on the cross beam. There is damping between the third connecting rod (1010) and the cross beam. A color analyzer (1020) is installed at the lower end of the third connecting rod (1010). The color analyzer (1020) is electrically connected to the controller (400).

7. A semi-automatic soil organic matter determination device according to claim 6, characterized in that: The second connecting rod (340) and the third connecting rod (1010) are synchronously connected by a cross bar (1100).

Images