A detection system and detection method for instant potassium sulfate soil analysis

Abstract

The present invention relates to the technical field of soil analysis and detection, and specifically discloses a detection system and a detection method for the analysis of potassium sulfate in soil, including a dilution tank and a detection unit for soil analysis. The detection system further includes: a telescopic stirring mechanism disposed in the dilution tank, which includes an upper stirring mechanism and a lower stirring mechanism, and the upper stirring mechanism and the lower stirring mechanism are connected by a spring; a pressure filtration mechanism for pressure-filtering the diluted soil solution and collecting the filtrate; it includes a collection tank, the top of the collection tank extends outward to form a pressure filtration plate, and the collection tank is connected to the upper stirring mechanism; a rotary telescopic assembly for driving the pressure filtration mechanism to rotate and vertically displace; when performing downward displacement, the pressure filtration mechanism filters and collects the filtrate and can squeeze and filter the filtered soil. The present invention can reduce the residual amount of potassium element in the solid after solid-liquid separation, thereby reducing the measurement error of potassium element in the filtrate, and does not require pouring and transferring the mixed solution.

Description

Technical Field

[0001] The present invention relates to the technical field of soil analysis and detection, and particularly to a detection system and a detection method for the analysis of soluble potassium sulfate in soil. Background Art

[0002] Soluble Potassium Sulfate (SOP) is an efficient potassium fertilizer, mainly used to provide potassium elements required by plants. Compared with ordinary potassium sulfate (K2SO4), soluble potassium sulfate has a faster dissolution rate and is suitable for agriculture, horticulture and soil improvement that require rapid provision of potassium elements.

[0003] Although soluble potassium sulfate can rapidly provide potassium elements, excessive application may lead to salt accumulation in the soil, which in turn affects the root health of plants. Therefore, it is necessary to control the potassium content in the soil within a reasonable range, which can not only provide the required potassium elements for plants, but also avoid the problem of salt accumulation caused by excessive fertilization.

[0004] However, the potassium requirements of soils with different textures and different plants are different. Therefore, it is necessary to apply an appropriate amount of soluble potassium sulfate according to different plant characteristics and the soil texture in which they are planted. Therefore, it is necessary to detect the soil for specific planted plant varieties, including soil detection before fertilization and soil detection after applying different amounts of soluble potassium sulfate, in order to finally determine the application amount of soluble potassium sulfate.

[0005] The common soil detection method is the extraction method. The collected soil is mixed with an extraction solution and filtered. The potassium content in the soil can be judged by detecting the potassium content in the filtrate through colorimetry, atomic absorption spectrometry, liquid chromatography, etc. Since the potassium content in the soil has a great impact on plant growth, the accuracy of potassium measurement is particularly important. The factors affecting the accuracy of potassium measurement mainly include the collection of soil samples and the collection of filtrate during extraction.

[0006] The existing extraction and filtration methods mainly include: 1) pouring the mixed solution into a filtration structure containing filter paper; 2) allowing the mixed solution to settle and taking the supernatant; 3) pouring the mixed solution into a centrifuge for solid-liquid separation. Method 1) takes a long time and requires cumbersome operation of pouring the mixed solution; Method 3) requires additional expensive equipment and requires cumbersome operation of pouring the mixed solution; Method 2) will cause some potassium-containing solutions to remain in the solid, resulting in a large measurement error of potassium in the filtrate. Summary of the Invention

[0007] The object of the present invention is to provide a detection system for the analysis of instant potassium sulfate in soil, so as to reduce the residual amount of potassium element in the solid after solid-liquid separation, thereby reducing the measurement error of potassium element in the filtrate, and there is no need to pour and transfer the mixed solution.

[0008] In addition, the present invention also provides a detection method based on the above detection system.

[0009] The present invention is realized through the following technical solutions:

[0010] A detection system for the analysis of instant potassium sulfate in soil, including a dilution tank and a detection unit for soil analysis. The detection system further includes:

[0011] A telescopic stirring mechanism, placed inside the dilution tank, which includes an upper stirring mechanism and a lower stirring mechanism, and the upper stirring mechanism and the lower stirring mechanism are connected by a spring;

[0012] A pressure filtration mechanism, used for pressure filtering the diluted soil solution and collecting the filtrate; it includes a collection tank, the top of the collection tank extends outward to form a pressure filter plate, and the soil solution enters the collection tank after being filtered by the pressure filter plate. The collection tank is connected to the upper stirring mechanism;

[0013] A rotary telescopic assembly, used to drive the pressure filtration mechanism to rotate and move vertically; when moving downward, the pressure filtration mechanism filters and collects the filtrate and can squeeze and filter the filtered soil.

[0014] The telescopic stirring mechanism of the present invention is different from the conventional stirring structure. On the one hand, it can be used for the stirring and mixing of the mixed solution (soil and water). On the other hand, when pressure filtration is required, the telescopic stirring mechanism can contract under the extrusion of the pressure filtration mechanism, that is, it can utilize the compressibility of the spring to reduce the vertical length of the telescopic stirring mechanism, so as to provide a downward movement space for the pressure filtration mechanism to realize the extrusion and filtration of the filtered soil (wet mud) by the pressure filtration mechanism.

[0015] The pressure filtration mechanism of the present invention can rotate and move vertically under the drive of the rotary telescopic assembly. When the rotary telescopic assembly drives the pressure filtration mechanism to rotate, the telescopic stirring mechanism rotates with the pressure filtration mechanism to realize the stirring function. When the rotary telescopic assembly drives the pressure filtration mechanism to move downward, when the lower stirring mechanism abuts against the bottom of the dilution tank, the pressure filtration mechanism continues to move downward, causing the spring to compress, providing space for the downward movement of the pressure filtration mechanism until the pressure filter plate squeezes and filters the wet mud, and squeezes the residual liquid in the wet mud into the collection tank.

[0016] In summary, by providing a telescopic stirring mechanism, a pressure filtration mechanism, and a rotary telescopic assembly that cooperate with each other, the present invention can not only achieve the stirring function, but also reduce the liquid residue in the wet mud after solid-liquid separation, thereby reducing the potassium element residue in the wet mud, further reducing the measurement error of potassium element in the filtrate, and eliminating the need to pour and transfer the mixed liquid.

[0017] In a preferred embodiment, the dilution tank is successively divided into a stirring section and a pressure filtration section from top to bottom, and the inner diameter of the stirring section is larger than that of the pressure filtration section;

[0018] The outer diameter of the pressure filtration plate is equal to the inner diameter of the pressure filtration section.

[0019] When the dilution tank is in the stirring state, the pressure filtration plate is located in the stirring section. Since the outer diameter of the pressure filtration plate is smaller than the inner diameter of the stirring section, the pressure mechanism can rotate inside the dilution tank. When the dilution tank is in the pressure filtration state, the outer wall of the pressure filtration plate closely adheres to the inner wall of the pressure filtration section and moves downward. Since there is no radial gap between the pressure filtration plate and the pressure filtration section, the mixed liquid can only flow from the top of the pressure filtration plate to the collection tank for collection after passing through the pressure filtration plate.

[0020] The above arrangement can prevent the unfiltered mixed liquid from entering the collection tank. Since the unfiltered mixed liquid contains soil and has a high turbidity, it is not conducive to subsequent filtrate detection and analysis.

[0021] In a preferred embodiment, the bottom of the pressure filtration section is a reduced-diameter section, and the inner diameter of the bottom of the reduced-diameter section is greater than or equal to the maximum width of the lower stirring mechanism.

[0022] The above arrangement can provide as much downward space as possible for the downward movement of the pressure filtration mechanism, realizing the pressure filtration of the wet mud by the pressure filtration plate.

[0023] In a preferred embodiment, the pressure filtration plate includes an outer fixing ring and an inner fixing ring; the outer fixing ring and the inner fixing ring are connected by a plurality of connecting plates, and a filter screen is arranged between the connecting plates, the outer fixing ring and the inner fixing ring.

[0024] In a preferred embodiment, a connecting member for connecting with the rotary telescopic assembly is arranged on the connecting plate.

[0025] In a preferred embodiment, a pressurizing mechanism is arranged on the outer wall of the collection tank, and the pressurizing mechanism is used to pressurize the filtered soil. The pressurizing mechanism is at least composed of one pressurizing plate.

[0026] The above arrangement of the pressurizing mechanism can, on the one hand, serve as a stirring structure to stir the mixed liquid, and on the other hand, compress the space that can accommodate the wet mud between the pressure filtration mechanism and the dilution tank. On the premise of the same soil treatment amount, compared with the case where the pressurizing mechanism is not provided, setting the pressurizing mechanism can shorten the downward movement stroke of the pressure filtration mechanism to achieve the pressure filtration of the wet mud.

[0027] In a preferred embodiment, the pressing mechanism includes a first pressing plate and / or a second pressing plate. The first pressing plate and the second pressing plate have a height difference, and ribs are provided between the first pressing plate and the second pressing plate.

[0028] In a preferred embodiment, an annular pressing plate and / or a second pressing plate are provided on the outer wall of the collection tank; the annular pressing plate and the second pressing plate have a height difference, and a plurality of ribs are provided between the annular pressing plate and the second pressing plate.

[0029] In a preferred embodiment, the collection tank includes an equal-diameter tank or a variable-diameter tank. When the collection tank is a variable-diameter tank, the inner diameter of the collection tank gradually decreases from top to bottom.

[0030] In a preferred embodiment, a liquid inlet and a feeding plate are provided on the side wall of the dilution tank; the feeding plate is inclined.

[0031] The detection system further includes a feeding mechanism for transporting the soil to the feeding plate, and the feeding mechanism is cooperatively provided with a microwave heating mechanism.

[0032] The microwave generated by the microwave heating mechanism of the present invention can penetrate the soil, causing cracks inside the soil, which is beneficial for subsequent stirring and mixing, that is, it can better achieve the dissolution of potassium elements in the soil.

[0033] The inclined setting of the feeding plate is beneficial for guiding the soil into the dilution tank.

[0034] At the same time, by providing a liquid inlet and a feeding plate on the side wall of the dilution tank, the present invention can achieve automatic feeding and improve automation.

[0035] In a preferred embodiment, the rotary telescopic assembly includes a driving mechanism, a turntable, and a telescopic member;

[0036] The driving mechanism is used to drive the turntable to rotate, and the fixed end of the telescopic member is connected to the bottom of the turntable; the telescopic end of the telescopic member is connected to the pressure filtration mechanism.

[0037] In a preferred embodiment, the top of the dilution tank is an open end, and the top of the dilution tank is detachably connected with a tank cover. The rotary telescopic assembly is installed on the tank cover; a sampling port is provided on the tank cover.

[0038] Based on the analysis method of the above detection system, it includes the following steps:

[0039] S1. Soil sampling: Take the same amount of soil at 5-10 different positions and mix them evenly. The sampling depth is 5-20 cm;

[0040] S2. Soil pretreatment: Dry, crush, and sieve the soil in sequence to make the particle size of the soil to be measured uniform;

[0041] S3. Soil dilution and filtration: Process the soil using the above detection system to obtain the filtrate;

[0042] S4. Analysis: Use the detection unit to detect the potassium element content in the filtrate, and analyze the soil potassium element content based on the potassium element content in the filtrate.

[0043] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0044] 1. By setting up a telescopic stirring mechanism, a pressure filtration mechanism, and a rotating telescopic component that cooperate with each other, the present invention can not only achieve the stirring function, but also, through the special structures of the telescopic stirring mechanism and the pressure filtration mechanism, achieve the filtration of the mixed liquid and the extrusion filtration of the filtered soil (wet mud). This can not only reduce the liquid residue in the wet mud, thereby reducing the potassium element residue in the wet mud, but also avoid the problem of cumbersome operation caused by pouring out the mixed liquid from the dilution tank.

[0045] 2. The present invention is provided with a pressurizing mechanism on the outer wall of the collection tank; under the premise of the same soil treatment amount, setting the pressurizing mechanism can shorten the downward movement stroke of the pressure filtration mechanism to achieve the pressure filtration of the wet mud compared with not setting it. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0047] Figure 1 is a schematic diagram of the detection system of Embodiment 1 of the present invention in a stirring state;

[0048] Figure 2 is a schematic diagram of the detection system of Embodiment 1 of the present invention in a pressure filtration state;

[0049] Figure 3 is a schematic structural diagram of the pressure filtration mechanism of Embodiment 1 of the present invention;

[0050] Figure 4 is a top view of the pressure filtration mechanism of Embodiment 1 of the present invention;

[0051] Figure 5 is a schematic structural diagram of the pressure filtration mechanism of Embodiment 2 of the present invention;

[0052] Figure 6 is a schematic structural diagram of the pressure filtration mechanism of Embodiment 3 of the present invention;

[0053] Figure 7 is a schematic structural diagram of the detection system of Embodiment 4 of the present invention.

[0054] Marks in the drawings and corresponding component names:

[0055] 1 - Can lid; 2 - Dilution tank; 3 - Driving mechanism; 4 - Telescopic member; 5 - Pressure filtration mechanism; 6 - Telescopic stirring mechanism; 7 - Feeding mechanism; 11 - Sampling port; 21 - Stirring section; 22 - Pressure filtration section; 23 - Necking section; 24 - Liquid inlet; 25 - Feed plate; 31 - Motor; 32 - First gear; 33 - Second gear; 51 - Collection tank; 52 - Pressure filter plate; 53 - First pressure plate; 54 - Rib; 55 - Second pressure plate; 56 - Upper fixing column; 57 - Annular pressure plate; 61 - Upper stirring mechanism; 62 - Spring; 63 - Lower stirring mechanism; 521 - Outer fixing ring; 522 - Inner fixing ring; 523 - Connecting plate; 524 - Filter screen; 525 - Connecting member. Detailed implementation mode

[0056] To make the purpose, technical solution and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the embodiments. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and do not limit the present invention. The following described embodiments are part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0057] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that: these specific details do not have to be adopted to implement the present invention. In other embodiments, well-known structures, materials or methods are not specifically described in order to avoid confusing the present invention. The materials, instruments and reagents used in the following embodiments, unless otherwise specified, can all be obtained from commercial channels. The technical means used in the embodiments, unless otherwise specified, are all conventional means well-known to those skilled in the art.

[0058] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0059] Embodiment 1:

[0060] In the prior art for filtering the diluted soil, either the supernatant is removed by static stratification, which has the problems of long time and a large amount of liquid residue in the wet mud; or the diluted mixture is poured out for filtration or centrifugal separation, which has the problem of cumbersome operation.

[0061] To solve the problems in the prior art, such as long time and cumbersome operation caused by filtration after soil dilution, and large measurement error of potassium element due to the large amount of liquid residue in wet mud, the present embodiment provides a detection system for instant potassium sulfate soil analysis, as Figures 1 - 5 shown, which includes a dilution tank 2 and a detection unit for soil analysis. The detection unit adopts the prior art and can specifically be the equipment used in colorimetry, atomic absorption spectrometry or liquid chromatography.

[0062] The detection system further includes:

[0063] A telescopic stirring mechanism 6, placed inside the dilution tank 2, whose vertical length can contract when it receives vertical extrusion. Specifically, the telescopic stirring mechanism 6 includes an upper stirring mechanism 61 and a lower stirring mechanism 63, and the upper stirring mechanism 61 and the lower stirring mechanism 63 are connected by a spring 62. The elasticity of the spring 62 is used to adjust the vertical length of the telescopic stirring mechanism 6. Specifically, when the upper stirring mechanism 61 receives a downward pressure and / or the lower stirring mechanism 63 receives an upward pressure, as Figure 2 shown, the spring 62 compresses and the vertical length of the telescopic stirring mechanism 6 decreases; when the upper stirring mechanism 61 receives an upward pulling force, as Figure 1 shown, under the pulling force of the upper stirring mechanism 61 and the gravity of the lower stirring mechanism 63, the spring 62 stretches and the vertical length of the telescopic stirring mechanism 6 increases.

[0064] A pressure filtration mechanism 5, used to perform pressure filtration on the diluted soil solution and collect the filtrate; it includes a collection tank 51, and the top of the collection tank 51 extends outward to form a pressure filtration plate 52. The soil solution enters the collection tank 51 after being filtered by the pressure filtration plate 52, and the collection tank 51 is connected to the upper stirring mechanism 61.

[0065] In this embodiment, the pressure filtration plate 52 is of an annular flat plate structure, and the pressure filtration plate 52 includes a filter screen 524. The filter screen 524 can allow water to pass through and intercept wet mud, that is, the filter screen 524 can filter the mixed liquid. The filter screen 524 can specifically be a filter cloth type filter screen. In a specific case, as Figure 5 shown, the pressure filtration plate 52 includes an outer fixing ring 521 and an inner fixing ring 522; the outer fixing ring 521 and the inner fixing ring 522 are connected by a plurality of connecting plates 523, and the filter screen 524 is arranged between the connecting plates 523, the outer fixing ring 521 and the inner fixing ring 522.

[0066] In this embodiment, when the collection tank 51 is a variable-diameter tank, the inner diameter of the collection tank 51 gradually decreases from top to bottom, which is beneficial to guiding the filtrate into the collection tank 51.

[0067] The rotating telescopic assembly is used to drive the filter press mechanism 5 to rotate and move vertically; when moving downward, the filter press mechanism 5 filters and collects the filtrate and can squeeze and filter the filtered soil. The rotating telescopic assembly can adopt any existing technology that can achieve the functions of rotation and telescopic.

[0068] In this embodiment, the rotary telescopic assembly includes a driving mechanism 3, a turntable and a telescopic member 4; the driving mechanism 3 is used to drive the turntable to rotate, and the fixed end of the telescopic member 4 is connected to the bottom of the turntable; the telescopic end of the telescopic member 4 is connected to the filter press mechanism 5. Specifically, one structure of the driving mechanism 3 is: including a motor 31, a first gear 32 and a second gear 33, the first gear 32 is arranged on the power output shaft of the motor 31, the second gear 33 is coaxially arranged on the outer wall of the turntable, and the first gear 32 and the second gear 33 are meshed. The driving mechanism 3 can also realize the driving of the turntable to rotate through a belt drive.

[0069] In this embodiment, the driving mechanism 3 drives the turntable to rotate, and since the filter pressing mechanism 5 is connected to the turntable through the telescopic member 4, the filter pressing mechanism 5 can rotate with the turntable, and the telescopic stirring mechanism 6 is driven to rotate, thereby realizing the stirring function of the telescopic stirring mechanism 6. The telescopic member 4 can be a hydraulic cylinder or a pneumatic cylinder, etc., and the telescopic member 4 is used to realize the up and down displacement of the filter pressing mechanism 5.

[0070] In a preferred embodiment, a connecting member 525 for connecting to a rotating telescopic assembly is provided on the connecting plate 523. Specifically, the connecting member 525 can be a connecting tube, and the telescopic end of the telescopic member 4 is inserted into the connecting tube and then fastened by bolts, thereby achieving a fixed connection between the telescopic end of the telescopic member 4 and the filter press mechanism 5.

[0071] In this embodiment, the telescopic stirring mechanism 6 can realize its stirring function by using the upper stirring mechanism 61 and the lower stirring mechanism 63, and when the spring 62 is compressed, the vertical length of the telescopic stirring mechanism 6 is reduced, which can provide space for the downward movement of the filter press mechanism 5: if a conventional stirring structure is adopted, the maximum stroke of the filter press mechanism 5 moving downward can only be the maximum height that the lower stirring mechanism 63 can descend. If the stroke is not large enough, the wet mud cannot be filtered, and it may even cause part of the mixed liquid to be unable to be filtered, resulting in too much liquid remaining in the dilution tank. One solution is not to set a stirring structure, but this cannot realize the stirring function. After the telescopic stirring mechanism 6 is adopted in this embodiment, the maximum stroke of the filter press mechanism 5 moving downward includes the maximum height that the lower stirring mechanism 63 can descend and the maximum compression length of the spring 62, which greatly increases the movement stroke of the filter press mechanism 5 and can realize the filtering of the wet mud after filtration, that is, this embodiment can have both stirring function and filter press function.

[0072] The working principle of this embodiment is:

[0073] Add the soil to be tested and water into the dilution tank 2 at a volume ratio of 1:1. At this time, the filter press plate 52 is above the liquid level, and the filter press plate 52 can prevent the liquid from splashing out from the top opening end of the dilution tank 2 during the stirring process; the spring 62 is in a stretched state, and the telescopic stirring mechanism 6 has the maximum vertical length; start the driving mechanism 3, and use the stirring of the telescopic stirring mechanism 6 to mix the soil and water to obtain a mixed liquid. Drive the telescopic end of the telescopic member 4 to move downward, push the filter press mechanism 5 to move downward. When the filter press plate 52 touches the liquid level, the filter screen 524 filters the mixed liquid. After filtration, the filtrate enters the collection tank 51 from above the filter press plate 52 for collection. The filter press plate 52 continues to move downward under the drive of the telescopic member 4 until the mixed liquid is completely filtered. Then, the filter press plate 52 continues to move downward under the drive of the telescopic member 4, and the filter press plate 52 generates a downward extrusion force on the wet mud, squeezing and filtering the remaining liquid in the wet mud into the collection tank 51 for collection.

[0074] In summary, in this embodiment, by setting the telescopic stirring mechanism 6, the filter press mechanism 5 and the rotating telescopic assembly that cooperate with each other, not only can the stirring function be realized, but also through the special structures of the telescopic stirring mechanism 6 and the filter press mechanism 5, the filtration of the mixed liquid and the extrusion filtration of the wet mud after filtration can be realized, which can not only reduce the liquid residue in the wet mud, and then reduce the potassium element residue in the wet mud, but also avoid the problem of cumbersome operation caused by pouring the mixed liquid out of the dilution tank 2.

[0075] In a preferred case, in order to prevent the mixed liquid from directly entering the collection tank 51 without filtration, the dilution tank 2 is successively a stirring section 21 and a filter press section 22 from top to bottom. The inner diameter of the stirring section 21 is larger than the inner diameter of the filter press section 22; the outer diameter of the filter press plate 52 is equal to the inner diameter of the filter press section 22. When in the stirring state, the filter press plate 52 is placed in the stirring section 21. When in the filter press state, the filter press plate 52 moves downward into the filter press section 22. During use, add the soil to be tested and water into the dilution tank 2 at a volume ratio of 1:1. At this time, the filter press plate 52 is above the liquid level, and the liquid level is lower than the top of the filter press section 22, that is, the liquid level is lower than the junction of the filter press section 22 and the stirring section 21; as Figure 1 shown, when in the stirring state, the filter press plate 52 is placed in the stirring section 21. Since the inner diameter of the stirring section 21 is larger than the outer diameter of the filter press plate 52, the dilution tank 2 does not hinder the rotation of the filter press mechanism 5; when the stirring and mixing are completed and filtration is required, the filter press plate 52 moves downward into the filter press section 22 until the filter press plate 52 touches the liquid level and starts filtration. When the filter press plate 52 continues to move downward, after all the liquid is completely filtered, the filter press plate 52 contacts the wet mud and squeezes the wet mud, filtering the remaining liquid in the wet mud into the collection tank 51. During the filtration process, since the outer diameter of the filter press plate 52 is consistent with the inner diameter of the filter press section 22, that is, there is no gap between the filter press plate 52 and the filter press section 22, it can prevent the mixed liquid from directly entering the collection tank 51 without filtration.

[0076] Further preferably, the bottom of the pressure filtration section 22 is a reduced diameter section 23, and the inner diameter of the bottom of the reduced diameter section 23 is greater than or equal to the maximum width of the lower stirring mechanism 63, so that the lower stirring mechanism 63 can move downward to the bottom of the dilution tank, which is conducive to realizing the lowest downward movement stroke of the telescopic stirring mechanism 6.

[0077] In a preferred case, in order to further shorten the downward stroke of the filter press plate 52, a pressurizing mechanism is provided on the outer wall of the collection tank 51. The pressurizing mechanism is used to pressurize the filtered soil. The pressurizing mechanism is at least composed of one pressurizing plate. Since the pressurizing mechanism occupies a certain space, with the same volume of wet mud, after the pressurizing mechanism is set, the height of the wet mud increases, and the downward stroke of the filter press plate 52 can be shortened to realize the pressure filtration of the wet mud.

[0078] In this embodiment, as Figure 3 shown, the pressurizing mechanism includes a first pressurizing plate 53 and / or a second pressurizing plate 55. The first pressurizing plate 53 and the second pressurizing plate 55 have a height difference, and ribs 54 are provided between the first pressurizing plate 53 and the second pressurizing plate 55.

[0079] In a preferred case, the top of the dilution tank 2 is an open end, and the top of the dilution tank 2 is detachably connected with a tank cover 1, specifically by bolt connection. The rotary telescopic assembly is installed on the tank cover 1; specifically, the turntable is arranged on the tank cover 1, the motor 31 is arranged on the outer wall of the tank cover 1, and the telescopic member 4 passes through the tank cover 1 and then is connected with the filter press plate 52.

[0080] Preferably, a sampling port 11 is provided on the tank cover 1, and samples can be taken from the collection tank 51 through the sampling port 11. Specifically, a sampling tube passes through the sampling port 11 and then enters the collection tank 51.

[0081] Embodiment 2:

[0082] This embodiment is based on Embodiment 1. The difference from the embodiment is that the structure of the pressurizing mechanism is different. As Figure 4 shown, a ring-shaped pressurizing plate 57 and / or a second pressurizing plate 55 are provided on the outer wall of the collection tank 51; the ring-shaped pressurizing plate 57 and the second pressurizing plate 55 have a height difference, and a plurality of ribs 54 are provided between the ring-shaped pressurizing plate 57 and the second pressurizing plate 55.

[0083] Embodiment 3:

[0084] This embodiment is based on Embodiment 1. The difference from the embodiment is that the shape of the collection tank 51 is different. As Figure 6 shown, the collection tank 51 includes an equal-diameter tank.

[0085] Preferably, a pressurizing mechanism as described in Embodiment 1 or Embodiment 2 is provided on the outer wall of the collection tank 51.

[0086] Example 4:

[0087] This example is based on Example 1.

[0088] As Figure 7 shown, the side wall of the dilution tank 2 in this example is provided with a liquid inlet 24 and a feeding plate 25; the liquid inlet 24 is used to automatically convey water into the dilution tank 2, and the feeding plate 25 is used to automatically introduce soil into the dilution tank 2. Preferably, the feeding plate 25 is inclined; which is conducive to guiding the material.

[0089] In this example, automatic feeding can be achieved.

[0090] Preferably, the detection system further includes a feeding mechanism 7, and the feeding mechanism 7 is used to convey the soil to the feeding plate 25. The feeding mechanism 7 is cooperatively provided with a microwave heating mechanism. The microwave heating mechanism is a prior art and can be arranged on the side wall of the feeding mechanism 7. The microwave generated by the microwave heating mechanism can penetrate the soil, causing cracks inside the soil, which is conducive to subsequent stirring and mixing, that is, it can better achieve the dissolution of potassium elements in the soil.

[0091] Example 5:

[0092] An analysis method for instant potassium sulfate soil analysis includes the following steps:

[0093] S1. Soil sampling: Take the same amount of soil at 5 - 10 different positions and mix them evenly. The sampling depth is 5 - 20 cm; this sampling method can improve the accuracy of sampling, which is conducive to improving the accuracy of soil detection;

[0094] S2. Soil pretreatment: The soil is dried, crushed and sieved in sequence to make the particle size of the soil to be tested uniform; the soil after pretreatment is conducive to the dissolution of potassium elements in subsequent soil dilution and filtration;

[0095] S3. Soil dilution and filtration: Use the detection system according to any one of Examples 1 - 4 to process the soil to obtain a filtrate, and this filtrate is used for subsequent analysis and detection;

[0096] S4. Analysis: Use the detection unit to detect the potassium element content in the filtrate, and analyze the soil potassium element content based on the potassium element content in the filtrate; the pH value of the filtrate can also be detected by a pH meter to analyze the acidity and alkalinity of the soil, etc.

[0097] The specific embodiments described above further elaborate on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only the specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0098] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they do not have any technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear description and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

Claims

1. A detection system for instant potassium sulfate soil analysis, comprising a dilution tank (2) and a detection unit for soil analysis, characterized in that, The detection system further includes: a telescopic stirring mechanism (6) disposed inside the dilution tank (2), which includes an upper stirring mechanism (61) and a lower stirring mechanism (63), and the upper stirring mechanism (61) and the lower stirring mechanism (63) are connected by a spring (62); a pressure filtration mechanism (5) for pressure-filtering the diluted soil solution and collecting the filtrate; it includes a collection tank (51), the top of the collection tank (51) extends outward to form a pressure filtration plate (52), and the collection tank (51) is connected to the upper stirring mechanism (61); a rotary telescopic assembly for driving the pressure filtration mechanism (5) to rotate and vertically displace; when the pressure filtration mechanism (5) moves downward, the pressure filtration mechanism (5) filters and collects the filtrate and can squeeze and filter the filtered soil; a pressurizing mechanism is provided on the outer wall of the collection tank (51), and the pressurizing mechanism is used to pressurize the filtered soil, and the pressurizing mechanism is at least composed of one pressurizing plate; the pressurizing mechanism includes a first pressurizing plate (53) and a second pressurizing plate (55), the first pressurizing plate (53) and the second pressurizing plate (55) have a height difference, and ribs (54) are provided between the first pressurizing plate (53) and the second pressurizing plate (55).

2. The detection system for instant potassium sulfate soil analysis according to claim 1, characterized in that, The dilution tank (2) is successively a stirring section (21) and a pressure filtration section (22) from top to bottom, and the inner diameter of the stirring section (21) is larger than the inner diameter of the pressure filtration section (22); The outer diameter of the pressure filtration plate (52) is equal to the inner diameter of the pressure filtration section (22).

3. The detection system for instant potassium sulfate soil analysis according to claim 2, characterized in that, The bottom of the pressure filtration section (22) is a reduced diameter section (23), and the inner diameter of the bottom of the reduced diameter section (23) is greater than or equal to the maximum width of the lower stirring mechanism (63).

4. A detection system for instant potassium sulfate soil analysis according to claim 1, characterized in that, The pressure filtration plate (52) includes an outer fixing ring (521) and an inner fixing ring (522); the outer fixing ring (521) and the inner fixing ring (522) are connected by a plurality of connecting plates (523), and a filter screen (524) is provided between the connecting plates (523), the outer fixing ring (521) and the inner fixing ring (522).

5. The detection system for instant potassium sulfate soil analysis according to claim 4, wherein A connecting member (525) for connecting with the rotary telescopic assembly is provided on the connecting plate (523).

6. The detection system for instant potassium sulfate soil analysis according to claim 1, characterized in that, A ring-shaped pressurizing plate (57) and a second pressurizing plate (55) are provided on the outer wall of the collection tank (51); the ring-shaped pressurizing plate (57) and the second pressurizing plate (55) have a height difference, and a plurality of ribs (54) are provided between the ring-shaped pressurizing plate (57) and the second pressurizing plate (55).

7. A detection system for instant potassium sulfate soil analysis according to claim 1, characterized in that, The collection tank (51) includes an equal-diameter tank or a variable-diameter tank. When the collection tank (51) is a variable-diameter tank, the inner diameter of the collection tank (51) gradually decreases from top to bottom.

8. The detection system for instant potassium sulfate soil analysis according to claim 1, characterized in that, An inlet (24) and a feeding plate (25) are provided on the side wall of the dilution tank (2); the feeding plate (25) is inclined; The detection system further includes a feeding mechanism (7), and the feeding mechanism (7) is used to convey the soil to the feeding plate (25), and the feeding mechanism (7) is provided with a microwave heating mechanism in cooperation.

9. The detection system for instant potassium sulfate soil analysis according to claim 1, wherein, The rotary telescopic assembly includes a driving mechanism (3), a turntable, and a telescopic member (4); The driving mechanism (3) is used to drive the turntable to rotate, and the fixed end of the telescopic member (4) is connected to the bottom of the turntable; the telescopic end of the telescopic member (4) is connected to the pressure filtration mechanism (5).

10. A detection system for instant potassium sulfate soil analysis according to any one of claims 1-9, characterized in that, The top of the dilution tank (2) is an open end, and a tank cover (1) is detachably connected to the top of the dilution tank (2). The rotary telescopic assembly is installed on the tank cover (1); a sampling port (11) is provided on the tank cover (1).

11. An analysis method based on the detection system according to any one of claims 1-10, characterized in that, It includes the following steps: S1. Soil sampling: Take the same amount of soil at 5 - 10 different positions and mix it evenly. The sampling depth is 5 - 20 cm; S2. Soil pretreatment: The soil is dried, crushed, and sieved in sequence to make the particle size of the soil to be measured uniform; S3. Soil dilution and filtration: Use the detection system described in any one of claims 1 - 10 to process the soil to obtain a filtrate; S4. Analysis: Use the detection unit to detect the potassium element content in the filtrate, and analyze the soil potassium element content based on the potassium element content in the filtrate.

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