A detection device and method for measuring nitrate nitrogen in soil

Abstract

The application discloses a detection device and method for nitrate nitrogen determination in soil, and relates to the technical field of nitrate nitrogen determination. The detection device comprises a box body, a plurality of sample boxes are placed in the box body, a motor is installed on one end of the outer side of the box body, a disc is installed on the output end of the motor, one end of a connecting rod is connected to the surface of the disc in an eccentric rotating manner, a lower sieve frame is installed on the top of the box body, an upper sieve frame is stacked above the lower sieve frame, a screen is installed in the lower sieve frame and the upper sieve frame, outer grooves are symmetrically arranged on the two sides of the lower sieve frame and the upper sieve frame, a rack is arranged in the outer grooves, a connecting hole is arranged on the bottom surface of one end of the lower sieve frame, a brushing sleeve is sleeved on the lower sieve frame and the upper sieve frame, gears are symmetrically and rotatably connected to the inner sides of the two ends of the brushing sleeve, and the gears are slidingly connected in the corresponding outer grooves. The application has the advantages of being capable of storing soil samples and facilitating soil screening.

Description

Technical Field

[0001] This invention relates to the field of nitrate nitrogen determination technology, and more specifically, to a detection device and method for determining nitrate nitrogen in soil. Background Technology

[0002] Nitrate nitrogen (NO3) - -N) refers to nitrate ions (NO3) - Nitrogen, existing in the form of nitrate nitrogen, is one of the main forms of inorganic nitrogen in soil. Nitrate nitrogen in soil is the main nitrogen source for plant nutrition. The content of nitrate nitrogen can indirectly reflect the level of nitrogen mineralization in the soil.

[0003] Currently, methods for determining nitrate nitrogen in soil generally include ultraviolet spectrophotometry, phenol disulfonic acid colorimetry, and reductive distillation. Regardless of the method, the general process can be divided into: target soil sample collection, soil sample processing, equipment measurement of nitrate nitrogen, and result calculation.

[0004] In soil sampling, soil samples need to be sieved to remove impurities such as stones and roots. Traditional methods of sieving soil samples require carrying multiple independent tools, such as shovels, sieves, and sample preservation equipment. This not only requires multiple people to work together, resulting in high labor costs, but also makes it inconvenient to carry the scattered and bulky tools when sampling in the field, affecting work efficiency. Therefore, it is necessary to propose a detection device and method for determining nitrate nitrogen in soil to solve the above problems. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention aims to provide a detection device and method for determining nitrate nitrogen in soil. This method solves the problems of numerous soil sample screening tools required for nitrate nitrogen determination, necessitating multiple people to work together, and the tools being scattered and inconvenient to carry. It has the advantages of being able to store soil samples and facilitating soil screening.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] A detection device for determining nitrate nitrogen in soil includes a housing, inside which are placed several sample boxes;

[0008] A motor is installed on the outer side of one end of the housing, and a disc is installed on the output end of the motor. One end of a connecting rod is eccentrically connected to the surface of the disc.

[0009] A lower screen frame is installed on the top of the box, and an upper screen frame is stacked on top of the lower screen frame. Screens are installed in both the lower screen frame and the upper screen frame. External grooves are symmetrically provided on both sides of the lower screen frame and the upper screen frame. A toothed rack is provided in the external groove. A connecting hole is provided on the bottom surface of one end of the lower screen frame, and the other end of the connecting rod is inserted into the connecting hole.

[0010] A brush sleeve is fitted onto the lower screen frame and the upper screen frame. Gears are symmetrically rotatably connected to the inner sides of both ends of the brush sleeve, and the gears are slidably connected to the corresponding outer groove.

[0011] As a preferred embodiment of the present invention, the inside of the box is provided with a storage compartment and a collection compartment from bottom to top, the sample box is placed in the collection compartment and the storage compartment, and a funnel is provided inside the collection compartment.

[0012] In a preferred embodiment of the present invention, a tail sleeve is installed at the top of the housing away from the motor, and a rotating shaft is installed on the tail sleeve. The two ends of the rotating shaft are rotatably connected to the side wall of the housing. The other ends of the lower screen frame and the upper screen frame are slidably connected to the tail sleeve. A plurality of first springs are installed inside the tail sleeve. The lower screen frame and the upper screen frame are elastically connected to the tail sleeve through the first springs. A plurality of mounting grooves are symmetrically provided on the top surface of one end of the lower screen frame, and a plurality of mounting blocks corresponding one-to-one with the connecting holes are provided on the bottom surface of one end of the upper screen frame, and each mounting block is slidably connected to the corresponding connecting hole.

[0013] In a preferred embodiment of the present invention, the brushing sleeve is slidably connected to the surfaces of the lower screen frame and the upper screen frame. Two retaining strips are symmetrically installed on the side of the brushing sleeve, and several retaining grooves are provided at equal intervals on the retaining strips. Two sets of second springs and two brush strips are symmetrically installed inside the brushing sleeve. The brush strips are elastically connected to the inside of the brushing sleeve through corresponding second springs. Two water spray nozzles are symmetrically installed inside the brushing sleeve on both sides of each brush strip.

[0014] As a preferred embodiment of the present invention, two sets of wedges and several third springs are symmetrically installed inside the brush cleaning sleeve. Each wedge is elastically connected to the inside of the brush cleaning sleeve by two third springs, and one end of the wedge abuts against the back of the corresponding brush strip, while the other end penetrates through the side of the brush cleaning sleeve. The other ends of several wedges in each set are connected into a whole by a connecting plate.

[0015] In a preferred embodiment of the present invention, pressure plates are installed in both the lower and upper screen frames, and the pressure plates abut against the outer side of the screen mesh. Slider blocks are symmetrically installed at both ends of the pressure plates. Several locking blocks are equidistantly installed on the side of the pressure plates away from the screen mesh. A lever block is installed on the pressure plate inside the upper screen frame. A cutting plate is installed between the two screen meshes. A sliding rod is provided through the cutting plate. Sliding plates are symmetrically slidably connected to both ends of the sliding rod. A fourth spring is installed between the sliding plate and the sliding rod.

[0016] In a preferred embodiment of the present invention, connecting plates are symmetrically installed at both ends of the two pressure plates. The connecting plates have first frames at both ends and second frames on their sides. The sliders at both ends of the pressure plates are slidably connected to the corresponding first frames, and the two ends of the sliding rods are slidably connected to the corresponding second frames. Two convex shafts are installed on the outer side of the connecting plates. One end of a long arm is rotatably connected to each convex shaft. One end of the long arm abuts against the corresponding slider, and a short arm is installed at the other end of the long arm. A torsion spring is installed on the long arm, and the long arm is elastically connected to the corresponding convex shaft through the torsion spring.

[0017] In a preferred embodiment of the present invention, both sides of the lower screen frame and the upper screen frame are provided with a spiral groove and an inner groove. The slider is slidably connected to the corresponding spiral groove, and the slide rod is slidably connected to the inner groove. The slide plate abuts against the inner wall of the inner groove. A plurality of protruding teeth are equidistantly installed in the inner groove, and the slide rod is symmetrically installed with protruding teeth at both ends. A push block is installed at the end of the inner groove on one side of the lower screen frame or the upper screen frame near the tail sleeve, and the push block is installed at the end of the inner groove on the other side near the motor. A push bar is installed inside the end of the inner groove near the tail sleeve.

[0018] As a preferred embodiment of the present invention, a detection method for a detection device for determining nitrate nitrogen in soil includes the following steps:

[0019] S1: Place the sample box at the bottom of the funnel in the collection chamber, slide the brush sleeve to position it at the ends of the lower and upper sieve frames, and then rotate the lower and upper sieve frames around the pivot to make the lower and upper sieve frames horizontally positioned on the top surface of the box, and ensure that the other end of the connecting rod is inserted into the connecting hole.

[0020] S2: Spread the target soil sample evenly on the sieve. The soil sample after screening falls through the funnel into the sample box inside the collection chamber. Each soil sample is placed in the same sample box. After filling the sample box, transfer it to the storage chamber for preservation.

[0021] S3: When large soil particles that cannot be screened out are trapped between the double-layer screens, the sliding pressure plate and cutting plate, in conjunction with the reciprocating motion of the lower and upper screen frames, crush and cut the large soil particles.

[0022] S4: After the screen is clogged or screening is completed, rotate the lower and upper screen frames to the vertical box again with the rotating shaft as the center, supply external water, and slide the brush sleeve. The brush strips and water spray cooperate to brush the screen.

[0023] S5: Following the method in S1, place the lower and upper screen frames horizontally back onto the top surface of the box.

[0024] Compared with the prior art, the advantages of this invention are:

[0025] 1. The reciprocating relative motion of the lower and upper sieve frames drives the relative motion of the double-layer sieves, which not only accelerates the soil sieving process, but also effectively breaks up clumps or soil with high moisture content by utilizing the lateral shear force generated by the sieve movement, significantly improving sieving efficiency. The overall design is highly integrated, combining the sieve, funnel, sample box and storage compartment into the same box, which simplifies the operation process and makes it easy to carry and store. It solves the problems of scattered tools, cumbersome operation and easy omission or loss of tools in traditional sampling, and significantly improves the efficiency and convenience of soil sample collection.

[0026] 2. By installing pressure plates and cutting plates that are tightly attached to the screen mesh inside the lower and upper screen frames, the pressure plates not only flatten the screen mesh during their sliding motion, but also work in conjunction with the relative movement of the double-layer screen mesh to create a rubbing effect on the particles, allowing the particles to quickly enter between the pressure plates for compression and crushing. At the same time, the cutting action of the cutting plates accelerates the crushing of the particles, thus effectively handling stubborn particles stuck between the screen meshes, preventing the screen mesh from bulging or being damaged. This not only solves the problem of particles getting stuck in the screen mesh, but also extends the service life of the screen mesh, ensuring the continuity and efficiency of the screening process. It is particularly suitable for soil treatment with high moisture content or prone to clumping.

[0027] 3. The design of the lower and upper sieve frames being able to rotate to the vertical box not only removes excess soil after screening, but also facilitates the reciprocating sliding of the scrubbing sleeve to scrub the screen. Furthermore, the vertical orientation of the lower and upper sieve frames allows the scrubbing mud and water to flow downwards, preventing the spread of contamination and improving cleaning efficiency. Push blocks are set at the front and rear ends of the two inner grooves, which can efficiently control the position of the sliding rod. When the scrubbing sleeve drives the pressure plate to slide towards the tail sleeve, the cutting plate will not vibrate. When the scrubbing sleeve returns, the convex teeth on the sliding rod engage with the convex teeth in the inner groove, causing the cutting plate to drive the screen to vibrate, thereby accelerating the dehydration of the screen, shortening the equipment's standby time, and further improving the efficiency of soil sample collection. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention.

[0030] Figure 3 This is a schematic diagram of the connecting rod and connecting hole mating structure of the present invention.

[0031] Figure 4 This is a schematic diagram of the split structure of the lower and upper screens of the present invention.

[0032] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle.

[0033] Figure 6 This is a partial structural diagram of the lower screen of the present invention.

[0034] Figure 7 This is a schematic diagram of the structure of the slider, slider rod and the first frame and the second frame of the present invention.

[0035] Figure 8 This is a schematic diagram of the structure of one end of the spiral groove and inner groove of the present invention.

[0036] Figure 9 This is a schematic diagram of the other end of the spiral groove and inner groove of the present invention.

[0037] Figure 10 This is a partial structural diagram of the cross-section of the lower screen frame of the present invention.

[0038] Figure 11 This is a schematic diagram of the side structure of the brush sleeve of the present invention.

[0039] Figure 12 This is a schematic diagram of the internal structure of the brush sleeve of the present invention.

[0040] Figure 13 This is a schematic diagram of the brush bar and wedge block mating structure of the present invention.

[0041] Figure 14 This is a schematic diagram of the structure of the two screens of the present invention, showing the state in which the soil is stuck between them.

[0042] Explanation of the labels in the diagram:

[0043] 11. Box body; 12. Funnel; 13. Collection chamber; 14. Storage chamber; 15. Sample box; 21. Motor; 22. Disc; 23. Connecting rod; 31. Tail sleeve; 32. Rotating shaft; 33. Lower sieve frame; 34. Upper sieve frame; 35. Sieve screen; 36. Outer groove; 37. Rack; 38. First spring; 39. Connecting hole; 391. Mounting groove; 392. Mounting block; 41. Brush sleeve; 42. Locking strip; 43. Locking groove; 44. Gear; 45. Second spring; 46. ​​Brush bar; 47. Water spray nozzle; 51. Wedge block; 52. Third spring; 53. Connecting plate; 61. Pressure plate; 62. Slider; 63. Locking block; 64. Pulling block; 65. Cutting plate; 66. Sliding rod; 67. Sliding plate; 68. Fourth spring; 71. Connecting plate; 72. First frame; 73. Second frame; 74. Protruding shaft; 75. Long arm; 76. Short arm; 77. Torsion spring; 81. U-shaped groove; 82. Inner groove; 83. Protruding tooth; 84. Push block; 85. Push bar. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] Example 1, please refer to Figures 1 to 14 As shown, the present invention discloses a detection device for determining nitrate nitrogen in soil, including a box 11, and a plurality of sample boxes 15 are placed inside the box 11.

[0046] A motor 21 is installed on the outer side of one end of the housing 11. A disc 22 is installed on the output end of the motor 21. One end of a connecting rod 23 is eccentrically connected to the surface of the disc 22.

[0047] A lower screen frame 33 is installed on the top of the box 11, and an upper screen frame 34 is stacked on top of the lower screen frame 33. Screens 35 are installed in both the lower screen frame 33 and the upper screen frame 34. External grooves 36 are symmetrically provided on both sides of the lower screen frame 33 and the upper screen frame 34. A rack 37 is provided in the external groove 36. A connecting hole 39 is provided on the bottom surface of one end of the lower screen frame 33, and the other end of the connecting rod 23 is inserted into the connecting hole 39.

[0048] A brushing sleeve 41 is fitted onto the lower screen frame 33 and the upper screen frame 34. Gears 44 are symmetrically rotatably connected to the inner sides of both ends of the brushing sleeve 41. The gears 44 are slidably connected to the corresponding outer groove 36.

[0049] The box 11 has a storage chamber 14 and a collection chamber 13 arranged from bottom to top inside. The sample box 15 is placed in the collection chamber 13 and the storage chamber 14. The collection chamber 13 is equipped with a funnel 12.

[0050] A tail sleeve 31 is installed at the top of the housing 11 away from the motor 21. A rotating shaft 32 is installed on the tail sleeve 31. Both ends of the rotating shaft 32 are rotatably connected to the side wall of the housing 11. The other ends of the lower screen frame 33 and the upper screen frame 34 are slidably connected to the tail sleeve 31. Several first springs 38 are installed inside the tail sleeve 31. The lower screen frame 33 and the upper screen frame 34 are elastically connected to the tail sleeve 31 through the first springs 38. Several mounting grooves 391 are symmetrically provided on the top surface of one end of the lower screen frame 33. Several mounting blocks 392 corresponding to the connecting holes 39 are provided on the bottom surface of one end of the upper screen frame 34. Each mounting block 392 is slidably connected to the corresponding connecting hole 39.

[0051] In the initial state, the lower screen frame 33 and the upper screen frame 34 are horizontally positioned on the top surface of the housing 11, and the brush sleeve 41 is located at the end of the housing 11 closest to the motor 21 (for ease of description, the end of the housing 11, the lower screen frame 33, the upper screen frame 34, the outer groove 36, the spiral groove 81, the inner groove 82, etc., closest to the motor 21 is defined as the front end, and the end closest to the tail sleeve 31 is defined as the rear end), and is restricted by the space formed by the front end of the housing 11, and cannot move.

[0052] The lower screen frame 33 and the upper screen frame 34 are stacked together. The mounting block 392 at the bottom front end of the upper screen frame 34 is engaged and slidably connected to the mounting groove 391 at the top front end of the lower screen frame 33. The mounting block 392 cannot be removed from the mounting groove 391. The rear ends of the lower screen frame 33 and the upper screen frame 34 are inserted into the tail sleeve 31. Therefore, the lower screen frame 33 and the upper screen frame 34 cannot be separated by the cooperation of the mounting block 392 and the mounting groove 391, as well as the restriction of the tail sleeve 31. This causes the screens 35 in the lower screen frame 33 and the upper screen frame 34 to abut against each other, forming a double-layer mesh.

[0053] The end of the connecting rod 23 is inserted into the connecting hole 39 at the bottom front end of the lower screen frame 33. At this time, the brush sleeve 41 is positioned such that the gears 44 at both ends inside it mesh with the racks 37 in the outer groove 36 formed by the stacking of the lower screen frame 33 and the upper screen frame 34 (both the lower screen frame 33 and the upper screen frame 34 have half of the outer groove 36 on their outer sides, and the two halves of the outer groove 36 are stacked together to form a complete groove; similarly, the inner groove 82 is also formed by splicing). The racks 37 on both sides inside the outer groove 36 are staggered, that is, the gears 44 mesh with the tail end of one rack 37 and the head end of the other rack 37 at the same time.

[0054] A funnel 12 is installed on top of the collection chamber 13 inside the housing 11. The funnel 12 is located below the lower sieve frame 33 (according to the instruction manual). Figure 1 (Direction shown).

[0055] Before collecting the target soil sample, a sample box 15 for preserving the soil sample is placed at the bottom of the funnel 12. Then, the staff evenly sprinkles the target soil onto the sieve 35 inside the upper sieve frame 34. During this process, the motor 21 starts, and through the cooperation of the disc 22 and the connecting rod 23, it drives the lower sieve frame 33 to reciprocate. Each time the lower sieve frame 33 moves closer to the motor 21, the corresponding first spring 38 inside the tail sleeve 31 is stretched. And by utilizing the meshing of the rack 37 and the gear 44 in the outer groove 36, the upper sieve frame 34 is simultaneously driven to move closer to the tail sleeve 31, thereby compressing the corresponding first spring 38 inside the tail sleeve 31.

[0056] During the relative movement of the lower sieve frame 33 and the upper sieve frame 34, their respective screens 35 move horizontally. The swaying of the screens 35 accelerates soil sieving. Furthermore, the relative movement of the two screens 35 generates a lateral shearing force, cutting large soil particles that are difficult to pass through the screens 35, quickly loosening them, and allowing them to pass through the screens 35 faster, thus improving sieving efficiency. The soil used for nitrate nitrogen determination is mostly fresh soil, and some soils may have relatively high moisture content, resulting in slightly higher soil viscosity and a tendency to clump, which is not conducive to soil sieving. The double-layered, relatively reciprocating screens 35 can improve the efficiency of breaking up soil clumps and better handle soils with slightly higher moisture content and compaction.

[0057] The sieved soil samples are collected through funnel 12 and fall into sample box 15 inside collection chamber 13. After collecting a sufficient amount of soil samples, sample box 15 can be placed in storage chamber 14 for proper preservation. The soil sample collection tools, collection tools, and preservation equipment are integrated into the same box 11, which is convenient for overall storage and carrying, avoids the problems of scattered tools and cumbersome operation in traditional sampling processes, and reduces the risk of sampling interruption due to equipment omission or loss, significantly improving the efficiency and convenience of field work.

[0058] Example 2 is an explanation based on Example 1. For details, please refer to [link / reference]. Figures 1 to 14 A pressure plate 61 is installed in both the lower screen frame 33 and the upper screen frame 34, and the pressure plate 61 abuts against the outside of the screen 35. Slider 62 is symmetrically installed at both ends of the pressure plate 61. Several locking blocks 63 are equidistantly installed on the side of the pressure plate 61 away from the screen 35. A lever 64 is installed on the pressure plate 61 inside the upper screen frame 34. A cutting plate 65 is installed between the two screens 35. A sliding rod 66 is provided through the inside of the cutting plate 65. Slide plates 67 are symmetrically slidably connected at both ends of the slide rod 66. A fourth spring 68 is installed between the slide plate 67 and the slide rod 66.

[0059] Two pressure plates 61 are symmetrically mounted with connecting plates 71 at both ends. The connecting plates 71 have first frames 72 at both ends and second frames 73 on the side. The sliders 62 at both ends of the pressure plates 61 are slidably connected to the corresponding first frames 72, and the two ends of the slide rods 66 are slidably connected to the corresponding second frames 73. Two convex shafts 74 are mounted on the outside of the connecting plates 71. One end of a long arm 75 is rotatably connected to each convex shaft 74. One end of the long arm 75 abuts against the corresponding slider 62, and a short arm 76 is mounted on the other end of the long arm 75. A torsion spring 77 is mounted on the long arm 75, and the long arm 75 is elastically connected to the corresponding convex shaft 74 through the torsion spring 77.

[0060] Both sides of the lower screen frame 33 and the upper screen frame 34 are provided with a spiral groove 81 and an inner groove 82. The slider 62 is slidably connected in the corresponding spiral groove 81, and the slide rod 66 is slidably connected in the inner groove 82. The slide plate 67 abuts against the inner wall of the inner groove 82. Several protruding teeth 83 are installed at equal intervals in the inner groove 82, and the slide rod 66 is symmetrically installed with protruding teeth 83 at both ends. A push block 84 is installed at the end of the inner groove 82 on one side of the lower screen frame 33 or the upper screen frame 34 near the tail sleeve 31, and a push block 84 is installed at the end of the inner groove 82 on the other side near the motor 21. A push bar 85 is installed inside the end of the inner groove 82 near the tail sleeve 31.

[0061] During the soil sieving process, some hard particles are inevitably present. Some particles can be sieved out, while others may get stuck between the two layers of screen 35 due to the relative movement of the screen 35 (particles slightly larger than the screen mesh size are most likely to get stuck between the two layers of screen 35). They cannot be removed or sieved out, and may also cause local bulging of screen 35, weakening the cutting effect of screen 35, and in severe cases, may damage screen 35.

[0062] Therefore, a pressure plate 61 and a cutting plate 65 are provided in the lower screen frame 33 and the upper screen frame 34. The cutting plate 65 is located between the two screens 35. The pressure plate 61 in the lower screen frame 33 and the upper screen frame 34 abuts against the surface of the screen 35 and clamps the cutting plate 65 in the middle. The two pressure plates 61 and the middle cutting plate 65 are connected into a whole by a connecting plate 71. That is, the sliders 62 at both ends of the pressure plate 61 are restricted in the first frame 72 at both ends of the connecting plate 71, and the two ends of the sliding rod 66 slidably connected in the cutting plate 65 are restricted in the second frame 73 on the side of the connecting plate 71. The size of the first frame 72 is larger than the thickness of the slider 62. In order to leave enough sliding space for the slider 62, it can switch up and down in the groove 81.

[0063] When particles are found stuck between the two layers of screens 35, the operator moves the lever 64 on the pressure plate 61 inside the upper screen frame 34, causing the pressure plate 61 to slide within the upper screen frame 34. This pressure plate 61, via the connecting plate 71, drives the slider 62 and the cutting plate 65 inside the lower screen frame 33 to slide synchronously. The edge of the slider 62 that contacts the screen 35 is curved, and the width of the slider 62 inside the lower screen frame 33 is greater than that of the pressure plate 61 inside the upper screen frame 34. The pressure plate 61 slides on the surface of the screen 35, compressing it to make it flatter; the cutting plate 65 slides between the two layers of screens 35. When the pressure plate 61 approaches the particles stuck between the screens 35, as per the instruction manual... Figure 14 As shown, the pressure plate 61, located within the lower screen frame 33, first contacts the particles, lifting them while simultaneously smoothing the screen 35 within the lower screen frame 33. Subsequently, as the pressure plate 61 and the cutting plate 65 continue to move, and during this process, the two screens 35 continuously slide back and forth, creating a reciprocating rubbing effect on the particles. This quickly pushes the particles between the two pressure plates 61. Furthermore, the curved edges of the pressure plates 61 facilitate the entry of particles between them. Since the two pressure plates 61 do not move up and down, they gradually compress the particles. Combined with the cutting action of the cutting plate 65, this efficiently pulverizes the particles, restoring the cutting function of the screens 35 and preventing damage to them.

[0064] Example 3 is an explanation based on Example 1. For details, please refer to [link / reference]. Figures 1 to 14 The brush sleeve 41 is slidably connected to the surfaces of the lower screen frame 33 and the upper screen frame 34. Two retaining strips 42 are symmetrically installed on the side of the brush sleeve 41. Several retaining grooves 43 are provided at equal intervals on the retaining strips 42. Two sets of second springs 45 and two brush strips 46 are symmetrically installed inside the brush sleeve 41. The brush strips 46 are elastically connected to the inside of the brush sleeve 41 through the corresponding second springs 45. Two water spray nozzles 47 are symmetrically installed inside the brush sleeve 41 on both sides of each brush strip 46.

[0065] The brush sleeve 41 is symmetrically equipped with two sets of wedges 51 and several third springs 52. Each wedge 51 is elastically connected to the inside of the brush sleeve 41 by two third springs 52. One end of the wedge 51 abuts against the back of the corresponding brush strip 46, and the other end passes through the side of the brush sleeve 41. The other ends of several wedges 51 in each set are connected into a whole by a connecting plate 53.

[0066] Soil that does not pass through the screen 35 will remain on the screen 35 and needs to be removed in time. First, turn off the motor 21, then slide the pressure plate 61 and the cutting plate 65 towards the brushing sleeve 41, so that several locking blocks 63 on the surface of the pressure plate 61 respectively engage with the corresponding locking slots 43 on the locking strip 42, so that the pressure plate 61 is installed on the side of the brushing sleeve 41.

[0067] Then, the tail sleeve 31 rotates around the pivot 32, causing the lower screen frame 33 and the upper screen frame 34 to rotate, and also causing the brush sleeve 41 to move in a synchronous circular motion until the lower screen frame 33 and the upper screen frame 34 are perpendicular to the box body 11. During the rotation, the soil on the surface of the screen 35 rolls off, achieving the cleaning effect.

[0068] Then, the external water source is connected, causing the water spray nozzle 47 inside the scrubbing sleeve 41 to start spraying water and slide the scrubbing sleeve 41 downwards. Then, the connecting plate 53 is pressed, and the connecting plate 53 drives several wedges 51 to slide into the scrubbing sleeve 41. The wedges 51 stretch the corresponding third spring 52 and squeeze the brush strip 46, causing the brush strip 46 to slide out of the scrubbing sleeve 41 and abut against the corresponding screen 35.

[0069] As the brush sleeve 41 slides, the brush bar 46 brushes the screen 35, and the water spray nozzle 47 sprays water. At the same time, the gears 44 inside both ends of the brush sleeve 41 slide in the outer groove 36 and cooperate with the rack 37, driving the lower screen frame 33 and the upper screen frame 34 to reciprocate, so that the screens 35 on both sides are misaligned, exposing the overlapping position, which makes it easier for the brush bar 46 and the water spray nozzle 47 to brush.

[0070] As the brush sleeve 41 slides towards the tail sleeve 31, it also drives the pressure plate 61 and the cutting plate 65 to slide, causing the pressure plate 61 and the cutting plate 65 to slide to the rear end of the lower screen frame 33 and the upper screen frame 34. A push block 84 and a push bar 85 (as per the instruction manual) are provided at the rear end of the inner groove 82 on one side of the lower screen frame 33 and the upper screen frame 34. Figure 9 As shown in the diagram), a pusher 84 is provided at the front end of the inner groove 82 on the other side of the lower screen frame 33 and the upper screen frame 34 (as shown in the instruction manual). Figure 10 As shown), when the slide rod 66 is at the front end of the inner groove 82, the push block 84 at that point abuts against one end of the slide rod 66, causing the slide rod 66 to slide towards the other inner groove 82. The slide rod 66 slides relative to the cutting plate 65, causing the protruding teeth 83 at both ends of the slide rod 66 to be misaligned with the protruding teeth 83 inside the inner groove 82. In this way, when the brush sleeve 41 drives the cutting plate 65 to slide towards the tail sleeve 31, the protruding teeth 83 at both ends of the slide rod 66 will not abut against the protruding teeth 83 inside the inner groove 82, and the cutting plate 65 will not be driven to fluctuate up and down, thereby avoiding vibration of the screen 35. This also prevents the screen 35 from vibrating when the pressure plate 61 drives the cutting plate 65 to crush the particles.

[0071] However, when the scrubbing sleeve 41 drives the cutting plate 65 to slide to the rear end of the inner groove 82, the push block 84 in one of the inner grooves 82 pushes the slide rod 66 towards the other inner groove 82, causing the protruding teeth 83 on the slide rod 66 to collide with the protruding teeth 83 in the inner groove 82. Then, as the scrubbing sleeve 41 drives the cutting plate 65 back to the front end of the lower sieve frame 33 and the upper sieve frame 34, the protruding teeth 83 in the inner groove 82 drive the cutting plate 65 to shake through the protruding teeth 83 on the slide rod 66, thereby causing the two sieves 35 to vibrate. The vibration of the sieves 35 causes the water stains attached to their surface to be shaken off quickly, thereby shortening the buffer time between two soil samples and improving the sample collection efficiency (during the return of the scrubbing sleeve 41, the water spray nozzle 47 stops spraying water).

[0072] If the distance between the two pressure plates 61 does not increase during the return process of the brushing sleeve 41, the cutting plate 65 will not be able to vibrate. Therefore, when the pressure plate 61 reaches the rear end of the inner groove 82, the push bar 85 sequentially abuts against and pushes the two short arms 76 on the surface of the connecting plate 71, thereby causing the corresponding long arms 75 to swing. The long arms 75 push the corresponding slider 62 to slide, and the slider 62 drives the pressure plate 61 to move. That is, the sliders 62 in the lower screen frame 33 and the upper screen frame 34 respectively enter another layer of the loop groove 81, and the distance between the two pressure plates 61 increases. In this way, when the brushing sleeve 41 drives the pressure plate 61 and the cutting plate 65 to return, under the restriction of the loop groove 81, the distance between the two pressure plates 61 is always kept at the maximum so that the cutting plate 65 has enough space to drive the screen 35 to vibrate.

[0073] This embodiment also discloses a detection method for a detection device for determining nitrate nitrogen in soil, including the following steps:

[0074] S1: Place the sample box 15 at the bottom of the funnel 12 in the collection chamber 13, slide the brush sleeve 41 so that it is at the end of the lower sieve frame 33 and the upper sieve frame 34, and then rotate the lower sieve frame 33 and the upper sieve frame 34 with the rotating shaft 32 as the center so that the lower sieve frame 33 and the upper sieve frame 34 are horizontally positioned on the top surface of the box 11, and ensure that the other end of the connecting rod 23 is inserted into the connecting hole 39.

[0075] S2: Sprinkle the target soil sample evenly on the sieve 35. The soil sample after screening falls through the funnel 12 into the sample box 15 inside the collection chamber 13. Each soil sample is placed in the same sample box 15. After filling the sample box 15, transfer it to the storage chamber 14 for storage.

[0076] S3: When large soil particles that cannot be screened out are trapped between the double-layer screens 35, the sliding pressure plate 61 and the cutting plate 65, together with the reciprocating motion of the lower screen frame 33 and the upper screen frame 34, crush and cut the large soil particles.

[0077] S4: After the screen 35 is blocked or screening is completed, the lower screen frame 33 and the upper screen frame 34 are rotated to the vertical box 11 again with the rotating shaft 32 as the center. External water source is supplied, and the sliding brush sleeve 41, brush strip 46 and water spray 47 cooperate with each other to brush the screen 35.

[0078] S5: Following the method in S1, place the lower screen frame 33 and the upper screen frame 34 back horizontally on the top surface of the box 11.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A detection device for determining nitrate nitrogen in soil, comprising a housing (11), characterized in that: The box (11) contains several sample boxes (15). A motor (21) is installed on the outer side of one end of the housing (11), and a disc (22) is installed on the output end of the motor (21). One end of a connecting rod (23) is eccentrically connected to the surface of the disc (22). The box (11) is equipped with a lower screen frame (33) on top, and an upper screen frame (34) is stacked on top of the lower screen frame (33). Screens (35) are installed in both the lower screen frame (33) and the upper screen frame (34). The lower screen frame (33) and the upper screen frame (34) are symmetrically provided with outer grooves (36) on both sides. A rack (37) is provided in the outer groove (36). A connecting hole (39) is provided on the bottom surface of one end of the lower screen frame (33), and the other end of the connecting rod (23) is inserted into the connecting hole (39). A brushing sleeve (41) is fitted onto the lower screen frame (33) and the upper screen frame (34). Gears (44) are symmetrically rotatably connected to the inner sides of both ends of the brushing sleeve (41). The gears (44) are slidably connected to the corresponding outer groove (36). The brushing sleeve (41) is slidably connected to the surfaces of the lower screen frame (33) and the upper screen frame (34). Two retaining strips (42) are symmetrically installed on the side of the brushing sleeve (41). Several retaining grooves (43) are provided at equal intervals on the retaining strips (42). Two sets of second springs (45) and two brush strips (46) are symmetrically installed inside the brushing sleeve (41). The brush strips (46) are elastically connected to the inside of the brushing sleeve (41) through the corresponding second springs (45). Two water spray nozzles (47) are symmetrically installed inside the brushing sleeve (41) on both sides of each brush strip (46).

2. The detection device for determining nitrate nitrogen in soil according to claim 1, characterized in that: The box (11) has a storage chamber (14) and a collection chamber (13) arranged from bottom to top inside. The sample box (15) is placed in the collection chamber (13) and the storage chamber (14). The collection chamber (13) is equipped with a funnel (12).

3. The detection device for determining nitrate nitrogen in soil according to claim 2, characterized in that: A tail sleeve (31) is installed at the top of the housing (11) away from the motor (21). A rotating shaft (32) is installed on the tail sleeve (31). Both ends of the rotating shaft (32) are rotatably connected to the side wall of the housing (11). The other ends of the lower screen frame (33) and the upper screen frame (34) are slidably connected to the tail sleeve (31). Several first springs (38) are installed inside the tail sleeve (31). The lower screen frame (33) and the upper screen frame (34) are elastically connected to the tail sleeve (31) through the first springs (38). Several mounting grooves (391) are symmetrically provided on the top surface of one end of the lower screen frame (33). Several mounting blocks (392) are provided on the bottom surface of one end of the upper screen frame (34) and correspond one-to-one with the connecting holes (39). Each mounting block (392) is slidably connected to the corresponding connecting hole (39).

4. The detection device for determining nitrate nitrogen in soil according to claim 3, characterized in that: The brushing sleeve (41) is symmetrically equipped with two sets of wedges (51) and several third springs (52). Each wedge (51) is elastically connected to the inside of the brushing sleeve (41) by two third springs (52). One end of the wedge (51) abuts against the back of the corresponding brush strip (46), and the other end penetrates the side of the brushing sleeve (41). The other ends of several wedges (51) in each set are connected into a whole by a connecting plate (53).

5. The detection device for determining nitrate nitrogen in soil according to claim 4, characterized in that: A pressure plate (61) is installed inside both the lower screen frame (33) and the upper screen frame (34), and the pressure plate (61) abuts against the outside of the screen (35). Slider blocks (62) are symmetrically installed at both ends of the pressure plate (61). Several locking blocks (63) are equidistantly installed on the side of the pressure plate (61) away from the screen (35). A lever block (64) is installed on the pressure plate (61) inside the upper screen frame (34). A cutting plate (65) is installed between the two screens (35). A sliding rod (66) is provided through the inside of the cutting plate (65). Sliding plates (67) are symmetrically slidably connected at both ends of the sliding rod (66). A fourth spring (68) is installed between the sliding plate (67) and the sliding rod (66).

6. The detection device for determining nitrate nitrogen in soil according to claim 5, characterized in that: Two connecting plates (71) are symmetrically installed at both ends of the two pressure plates (61). The connecting plates (71) have first frames (72) at both ends and second frames (73) on the side. The sliders (62) at both ends of the pressure plates (61) are slidably connected to the corresponding first frames (72). The two ends of the sliding rods (66) are slidably connected to the corresponding second frames (73). Two convex shafts (74) are installed on the outside of the connecting plates (71). One end of a long arm (75) is rotatably connected to each convex shaft (74). One end of the long arm (75) abuts against the corresponding slider (62). A short arm (76) is installed at the other end of the long arm (75). A torsion spring (77) is installed on the long arm (75), and the long arm (75) is elastically connected to the corresponding convex shaft (74) through the torsion spring (77).

7. The detection device for determining nitrate nitrogen in soil according to claim 6, characterized in that: The lower screen frame (33) and the upper screen frame (34) are provided with a spiral groove (81) and an inner groove (82) on both sides. The slider (62) is slidably connected to the corresponding spiral groove (81), and the slide rod (66) is slidably connected to the inner groove (82). The slide plate (67) abuts against the inner wall of the inner groove (82). Several protruding teeth (83) are installed at equal intervals in the inner groove (82), and protruding teeth (83) are symmetrically installed at both ends of the slide rod (66). A push block (84) is installed at one end of the inner groove (82) of the lower screen frame (33) or the upper screen frame (34) near the tail sleeve (31), and the push block (84) is installed at the other end of the inner groove (82) near the motor (21). A push bar (85) is installed inside the inner groove (82) near the tail sleeve (31).

8. The detection method of the detection device for determining nitrate nitrogen in soil according to claim 7, characterized in that, Includes the following steps: S1: Place the sample box (15) at the bottom of the funnel (12) in the collection chamber (13), slide the brush sleeve (41) so that it is at the end of the lower sieve frame (33) and the upper sieve frame (34), and then rotate the lower sieve frame (33) and the upper sieve frame (34) with the rotating shaft (32) as the center so that the lower sieve frame (33) and the upper sieve frame (34) are horizontally positioned on the top surface of the box (11), and ensure that the other end of the connecting rod (23) is inserted into the connecting hole (39); S2: Sprinkle the target soil sample evenly on the sieve (35). The soil sample after screening falls into the sample box (15) inside the collection chamber (13) through the funnel (12). Each soil sample is placed in the same sample box (15). After filling the sample box (15) to the storage chamber (14) for storage. S3: When large soil particles that cannot be screened out are sandwiched between the double-layer screens (35), the sliding pressure plate (61) and the cutting plate (65), together with the reciprocating motion of the lower screen frame (33) and the upper screen frame (34), crush and cut the large soil particles. S4: After the screen (35) is blocked or screening is completed, rotate the lower screen frame (33) and the upper screen frame (34) to the vertical box (11) again with the rotating shaft (32) as the center, supply external water source, and slide the brush sleeve (41). The brush strip (46) and the water spray (47) cooperate with each other to brush the screen (35). S5: Place the lower sieve frame (33) and the upper sieve frame (34) horizontally on the top surface of the box (11) in accordance with the method of S1.

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