Soil organic carbon content detection device and method based on near infrared spectrum technology

Abstract

The invention discloses a soil organic carbon content detection device and method based on a near infrared spectrum technology in the technical field of soil detection. The soil organic carbon content detection device comprises a near infrared spectrometer, a mounting rack arranged on the near infrared spectrometer and a sample placement box arranged on the mounting rack, the sample placing box comprises an open storage box, a baffle and a moving rod, the baffle is slidably arranged in an opening of the open storage box, and the moving rod is pulled to drive the baffle to move in the open storage box, so that the thickness of a sample between the open storage box and the baffle can be adjusted as required; the sample in the sample storage box is positioned and is prevented from moving, so that the detection accuracy of the organic carbon content of the soil is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of soil detection, and particularly to a device and method for detecting the content of soil organic carbon based on near-infrared spectroscopy technology. Background Art

[0002] Soil organic carbon is an important indicator for evaluating soil quality, fertility and carbon cycle. Its content directly affects the physical, chemical and biological properties of the soil and is closely related to global climate change. In outdoor or on-site detection scenarios, handheld near-infrared spectrometers have become the main tools for soil organic carbon detection due to their portability, non-destructive detection characteristics and rapid analysis capabilities. During the detection process, the collected soil samples are usually directly placed into the detection container. Due to the lack of adjustment and positioning facilities, the samples in the container are prone to inconsistent thickness due to differences in bulk density. Near-infrared spectroscopy detection is highly sensitive to the thickness of the sample. Uneven thickness will significantly change the optical path length, resulting in spectral signal distortion, thereby affecting the model prediction accuracy and the accuracy of soil organic carbon content detection. Summary of the Invention

[0003] The purpose of the present invention is to provide a device and method for detecting the content of soil organic carbon based on near-infrared spectroscopy technology, so as to solve the problem that due to the lack of adjustment and positioning facilities, the samples in the container are prone to inconsistent thickness due to differences in bulk density as mentioned in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A device for detecting the content of soil organic carbon based on near-infrared spectroscopy technology, comprising: a near-infrared spectrometer, a mounting rack provided on the near-infrared spectrometer, and a sample placement box provided on the mounting rack;

[0005] The sample placement box includes an open-top storage box, a baffle, and a moving rod. The baffle is slidably arranged in the open top of the open-top storage box. The moving rod is used to drive the baffle to move within the open-top storage box to change the thickness of the sample inside the sample placement box.

[0006] Preferably, the mounting rack includes a support rod, a turntable provided at the end of the support rod, a driving member for driving the turntable to rotate, and a plurality of mounting rods provided on the turntable. There are a plurality of the open-top storage boxes, and the plurality of open-top storage boxes are respectively arranged on the plurality of mounting rods.

[0007] Preferably, both the mounting rod and the support rod are telescopic members.

[0008] Preferably, a clamping member is provided on the support rod, and the clamping member is installed on the handle of the near-infrared spectrometer.

[0009] Preferably, the open storage box is provided with mounting holes, the moving rod is slidably arranged in the mounting holes, the inner side wall of the mounting holes is provided with mounting grooves, the mounting grooves are slidably provided with limiting blocks and elastic members connected to the limiting blocks, the moving rod is provided with a plurality of limiting grooves sequentially distributed along the moving direction of the moving rod, and the limiting blocks are inserted into the limiting grooves.

[0010] Preferably, an elastic reset member is arranged between the moving rod and the open storage box, a pushing block is arranged on the limiting block, a weight block is arranged in the mounting groove, when the turntable rotates and the sample placing box is located below the turntable, the weight block moves above the pushing block and presses it under the action of gravity, driving the limiting block to move out of the limiting groove and releasing the restriction on the moving rod.

[0011] Preferably, a screw sleeve for sleeving on the outer wall of the moving rod is rotatably arranged in the open storage box, a scraping plate is arranged on the screw sleeve, and a thread is arranged on the outer wall of the moving rod.

[0012] Preferably, an extension plate is slidably arranged on the scraping plate, and the moving direction of the extension plate is the same as the moving direction of the moving rod.

[0013] Preferably, for the soil organic carbon content detection method based on near-infrared spectroscopy technology, using the above-mentioned soil organic carbon content detection device based on near-infrared spectroscopy technology, it includes the following steps:

[0014] S1: Put the collected sample into the open storage box, pull the moving rod to make the baffle move to block the opening of the open storage box, and by continuously pulling the moving rod, adjust the position of the baffle so that the thickness of the sample between the open storage box and the baffle is adjusted to a preset value;

[0015] S2: Detect the sample inside the sample placing box through a near-infrared spectrometer to obtain the content of organic carbon in the sample.

[0016] Compared with the prior art, the beneficial effect of the present invention is that by pulling the moving rod, it is used to drive the baffle to move inside the open storage box, so that the thickness of the sample between the open storage box and the baffle can be adjusted according to requirements, and the sample inside the sample storage box is positioned to prevent its movement, ensuring the accuracy of the soil organic carbon content detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the soil organic carbon content detection device of the present invention;

[0018] Figure 2 is a schematic connection structure diagram of the mounting frame and the sample placing box of the present invention;

[0019] Figure 3 is a schematic cross-sectional structure diagram of the sample placing box of the present invention;

[0020] Figure 4 For the present invention Figure 3 Schematic enlarged view of the structure at position B in the present invention;

[0021] Figure 5 Schematic connection structure diagram of the limit block and the push block of the present invention;

[0022] Figure 6 For the present invention Figure 2 Schematic enlarged view of the structure at position A in the present invention.

[0023] In the figure: 1. Near-infrared spectrometer; 2. Mounting rack; 21. Clamping member; 22. Support rod; 23. Turntable; 24. Mounting rod; 25. Driving motor; 26. Driving gear; 27. Gear ring; 3. Sample placement box; 31. Open storage box; 32. Baffle; 33. Moving rod; 34. Elastic reset member; 35. Mounting groove; 36. Limit block; 37. Elastic member; 38. Counterweight; 39. Limit groove; 310. Scraper; 311. Extension plate; 312. Nut sleeve; 313. Push block. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1

[0026] Please refer to Figure 1 , a soil organic carbon content detection device based on near-infrared spectroscopy technology, comprising: a near-infrared spectrometer 1 (specifically a handheld near-infrared spectrometer, which is convenient to carry and can be used to detect the soil organic carbon content. This device is an existing device and will not be described in detail here), and a mounting rack 2 is installed on the near-infrared spectrometer 1;

[0027] Among them, please refer to Figure 1 and Figure 2 , the mounting rack 2 includes a clamping member 21, a support rod 22 provided on the clamping member 21, a turntable 23 rotatably provided at the end of the support rod 22, a driving member for driving the turntable 23 to rotate, and a plurality of mounting rods 24 provided on the turntable 23;

[0028] It should be noted that the clamping member 21 refers to a fixture, and the fixture clamps on the handle of the near-infrared spectrometer.

[0029] Please refer to Figure 1 , Figure 2 and Figure 3, a sample placement box 3 is installed on each of several mounting rods 24. The sample placement box 3 includes an open storage box 31 and a baffle 32. The open storage box 31 is installed at the end of the mounting rod 24. Mounting holes are provided on the side wall of the open storage box 31. A moving rod 33 is slidably inserted into the mounting holes. The end of the moving rod 33 is connected to the baffle 32. The baffle 32 is transparent (it can be made of transparent acrylic sheet) to allow the light of the near-infrared spectrometer 1 to pass through.

[0030] In this embodiment, as a further optimized solution, please refer to Figure 2 and Figure 6 , the driving member includes a driving motor 25, a driving gear 26 provided on the output shaft of the driving motor 25, and a gear ring 27. The gear ring 27 is installed on the side wall of the turntable 23. The turntable 23 and the gear ring 27 are coaxial, and the gear ring 27 meshes with the driving gear 26.

[0031] A method for detecting the soil organic carbon content based on near-infrared spectroscopy technology includes the following steps:

[0032] First, collect soil samples and process them (such as removing impurities). Put the collected samples into the inside of the open storage box 31. Then pull the moving rod 33 to move the baffle 32 to block the opening of the open storage box 31. Then continue to pull the moving rod 33 to move the baffle 32 deeper into the open storage box 31 to restrict the soil samples, change the thickness of the soil samples between the open storage box 31 and the baffle 32, and adjust it to the required thickness.

[0033] Second, control the near-infrared spectrometer 1 to work, and detect the samples inside the sample placement box 3 through the near-infrared spectrometer 1 to obtain the content of organic carbon in the samples.

[0034] Third, the driving motor 25 works to drive the driving gear 26 to drive the gear ring 27 and the turntable 23 to rotate, rotate the sample placement box 3 containing the soil samples to below, and then discharge the soil samples inside the sample placement box 3.

[0035] It should be noted that the soil samples are selected as dry soil, or the soil is dried after sampling to ensure that the soil samples remain dry during the detection process.

[0036] In this embodiment, as a further optimized solution, please refer to Figure 2, both the mounting rod 24 and the support rod 22 are telescopic members. The telescopic member is a telescopic rod (including a telescopic mother rod and a telescopic son rod slidably inserted into the inner cavity of the telescopic mother rod. A bolt is screwed on the outer wall of the telescopic mother rod, and the bolt is used to fix the telescopic son rod), so that the lengths of the mounting rod 24 and the support rod 22 can be adjusted to adjust the position of the sample placement box 3 so that it faces the detection area of the near-infrared spectrometer 1; and by contracting the mounting rod 24 and the support rod 22, the volume of the mounting frame 2 can be reduced, and the space occupied when it is not in use can be reduced.

[0037] Embodiment 2

[0038] As a further optimized solution of Embodiment 1, please refer to Figure 3 , Figure 4 and Figure 5 , an installation groove 35 is opened on the inner side wall of the installation hole. A limiting block 36 is slidably arranged in the inner cavity of the installation groove 35. An elastic member 37 (spring) is installed between the installation groove 35 and the limiting block 36. A plurality of limiting grooves 39 are opened on the outer wall of the moving rod 33. The plurality of limiting grooves 39 are sequentially distributed along the moving direction of the moving rod 33. The limiting block 36 is inserted into the inner cavity of a limiting groove 39 to fix the moving rod 33, thereby fixing the baffle 32 so that it will not move easily; the end of the limiting block 36 facing the limiting groove 39 is set as the insertion end. The side wall of the insertion end close to the baffle 32 is an inclined surface or an arc surface, and the side wall of the insertion end far from the baffle 32 is a plane; when pulling the moving rod 33 to move the baffle 32 towards the inside of the open storage box 31, the inner side wall of the limiting groove 39 contacts the inclined surface or the arc surface of the insertion end, which is used to squeeze the limiting block 36 out of the limiting groove 39, so that the moving rod 33 can move the baffle 32 without being hindered when reducing the thickness of the soil sample. As the moving rod 33 continues to move, when the limiting block 36 is aligned with the next limiting groove 39, the elastic member 37 pushes the limiting block 36 into the inner cavity of the limiting groove 39; an elastic reset member 34 (spring) is arranged between the moving rod 33 and the open storage box 31. A push block 313 is arranged on the limiting block 36, and a counterweight block 38 (such as a metal block) is arranged in the inner cavity of the installation groove 35; when the turntable 23 rotates so that the sample placement box 3 containing the soil sample is below the turntable 23, the counterweight block 38 on the sample placement box 3 moves above the push block 313. Under the action of gravity, the counterweight block 38 falls to press the push block 313, driving the limiting block 36 to move out of the limiting groove 39, releasing the restriction on the moving rod 33. The moving rod 33 moves under the action of the elastic reset member 34, pushing the baffle 32 towards the outside of the open storage box 31 to open the opening of the open storage box 31 for automatically discharging the soil sample inside the open storage box 31.

[0039] In this embodiment, as a further optimized solution, please refer to Figure 4 and Figure 5, a screw sleeve 312 is rotatably provided in the inner cavity of the open storage box 31. The screw sleeve 312 is sleeved on the outer wall of the moving rod 33. A scraping plate 310 is provided on the side wall of the screw sleeve 312, and a thread is provided on the outer wall of the moving rod 33; when the moving rod 33 drives the baffle 32 to move outward from the open storage box 31, the screw sleeve 312 will drive the scraping plate 310 to rotate, which is used to assist the open storage box 31 to automatically discharge materials; when the moving rod 33 moves and the baffle 32 moves deeper into the interior of the open storage box 31, the screw sleeve 312 will also drive the scraping plate 310 to rotate, which is used to disturb the soil sample to make it dispersed, so as to facilitate the baffle 32 to move deeper into the interior of the open storage box 31, and at the same time reduce the extrusion force received by the soil sample.

[0040] In this embodiment, as a further optimized solution, please refer to Figure 4 and Figure 5 , a storage groove is formed on the side wall of the scraping plate 310 facing the baffle 32. The expansion plate 311 is slidably inserted into the inner cavity of the storage groove. A spring is installed between the storage groove and the expansion plate 311. The moving direction of the expansion plate 311 is the same as the moving direction of the moving rod 33; the expansion plate 311 is used to increase the contact area between the scraping plate 310 and the soil sample, and when the baffle 32 moves into the interior of the open storage box 31, the expansion plate 311 will also move into the interior of the storage groove when it receives the extrusion force applied by the baffle 32, so as to prevent the expansion plate 311 from hindering the movement of the baffle 32.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting soil organic carbon content based on near-infrared spectroscopy technology, characterized in that: Comprising: A near-infrared spectrometer (1), a mounting rack (2) provided on the near-infrared spectrometer (1), and a sample placement box (3) provided on the mounting rack (2); The sample placement box (3) includes an open storage box (31), a baffle (32), and a moving rod (33). The baffle (32) is slidably provided in the opening of the open storage box (31), and the moving rod (33) is used to drive the baffle (32) to move within the open storage box (31) to change the thickness of the sample inside the sample placement box (3).

2. The soil organic carbon content detection device based on near-infrared spectroscopy technology according to claim 1, wherein: The mounting rack (2) includes a support rod (22), a turntable (23) provided at the end of the support rod (22), a driving member for driving the turntable (23) to rotate, and a plurality of mounting rods (24) provided on the turntable (23). There are a plurality of the open storage boxes (31), and the plurality of open storage boxes (31) are respectively provided on the plurality of mounting rods (24).

3. The soil organic carbon content detection device based on near-infrared spectroscopy technology according to claim 2, wherein: Both the mounting rod (24) and the support rod (22) are telescopic members.

4. The soil organic carbon content detection device based on near-infrared spectroscopy technology according to claim 2, characterized in that: A clamping member (21) is provided on the support rod (22), and the clamping member (21) is mounted on the handle of the near-infrared spectrometer (1).

5. The soil organic carbon content detection device based on near-infrared spectroscopy technology according to claim 2, wherein: An installation hole is provided on the open storage box (31), the moving rod (33) is slidably provided in the installation hole, an installation groove (35) is provided on the inner side wall of the installation hole, a limiting block (36) and an elastic member (37) connected to the limiting block (36) are slidably provided in the installation groove (35). A plurality of limiting grooves (39) are provided on the moving rod (33) and are distributed in sequence along the moving direction of the moving rod (33), and the limiting block (36) is inserted into the limiting groove (39).

6. The soil organic carbon content detection device based on near-infrared spectroscopy technology according to claim 5, characterized in that: An elastic reset member (34) is provided between the moving rod (33) and the open storage box (31). A push block (313) is provided on the limiting block (36), and a weight block (38) is provided in the installation groove (35). When the turntable (23) rotates and the sample placement box (3) is located below the turntable (23), the weight block (38) moves above the push block (313) and presses it under the action of gravity, driving the limiting block (36) to move out of the limiting groove (39) to release the restriction on the moving rod (33).

7. The soil organic carbon content detection device based on near-infrared spectroscopy technology according to claim 1, characterized in that: A screw sleeve (312) for sleeving on the outer wall of the moving rod (33) is rotatably provided in the open storage box (31), a scraping plate (310) is provided on the screw sleeve (312), and a thread is provided on the outer wall of the moving rod (33).

8. The soil organic carbon content detection device based on near-infrared spectroscopy technology according to claim 7, characterized in that: An extension plate (311) is slidably provided on the scraping plate (310), and the moving direction of the extension plate (311) is the same as the moving direction of the moving rod (33).

9. A method for detecting soil organic carbon content based on near-infrared spectroscopy technology, using the device for detecting soil organic carbon content based on near-infrared spectroscopy technology according to any one of claims 1-8, characterized in that: Including the following steps: S1: Put the collected sample into the open storage box (31), pull the moving rod (33) to move the baffle (32) to block the opening of the open storage box (31), and continue to pull the moving rod (33) to adjust the position of the baffle (32) so that the thickness of the sample between the open storage box (31) and the baffle (32) is adjusted to a preset value; S2: Detect the sample inside the sample placement box (3) through the near-infrared spectrometer (1) to obtain the content of organic carbon in the sample.

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