CN218994902U

CN218994902U - Quick extraction element of nitrate nitrogen suitable for in soil

Info

Publication number: CN218994902U
Application number: CN202223217256.7U
Authority: CN
Inventors: 陈珊; 柳军; 陈劲虎; 徐郭海林; 皮杰; 钱明艳
Original assignee: Jiangsu Academy of Agricultural Sciences
Current assignee: Jiangsu Academy of Agricultural Sciences
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-05-09
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a rapid extraction device suitable for nitrate nitrogen in soil, wherein the periphery of the top of a middle cylinder is provided with a first external thread, the periphery of the bottom of the middle cylinder is provided with a second external thread, the top of the middle cylinder is connected with a top cover, the middle cylinder is connected with a bottom cover, the center of the top cover is outwards provided with an internal thread channel, the internal thread channel is connected with the external thread of a central rod, the top end of the central rod is connected with a rotary handle, and the bottom end of the central rod is connected with the center of a central circular plate; the center of the bottom cover is outwards provided with a water collecting channel, a first filter screen and a second filter screen are axially arranged between the middle cylinder body and the bottom cover, a filter membrane is arranged between the first filter screen and the second filter screen, and the center circular plate moves downwards and pushes soil solution downwards and sequentially passes through the first filter screen, the filter membrane and the second filter screen to flow outwards. Compared with the prior art, the technical scheme of the utility model has the advantages of convenient replacement, high efficiency, safety, reliability and the like, and can effectively simplify the operation flow and improve the detection efficiency.

Description

Quick extraction element of nitrate nitrogen suitable for in soil

Technical Field

The utility model relates to the technical field of determination of nitrate nitrogen in soil, in particular to a rapid extraction device suitable for nitrate nitrogen in soil.

Background

Nitro-nitrogen is an important component in soil and in plant growth processes, and in natural environments, nitrate nitrogen can migrate through the soil or accompany the water body to the soil below. Therefore, the amount of nitrate nitrogen in the shallow soil surface layer and the excessive depth of the soil in which the nitrate nitrogen is located can cause that plants cannot absorb the nitrate nitrogen normally. However, if excessive nitrate nitrogen is concentrated on the surface layer of the soil, it is liable to cause hardening of the soil and even death of the plant. Therefore, in modern soil science research, in an evaluation system for the nitrogen supply capacity of the soil, not only the total nitrogen content index of the soil needs to be concerned, but also the content of nitrate nitrogen which is most easily absorbed by crops in the soil needs to be concerned, which is a key for evaluating the nitrogen supply capacity of the soil and is also an important index for measuring the fertilization system of the soil.

In the soil nitrate nitrogen content measurement, the sampled soil is required to be dissolved in a water body, and meanwhile, because the soil contains mineral substances and other particles which cannot be dissolved in the water, when the solution is extracted for analysis, the particles and the solution are required to be separated, so that the solution is conveniently extracted, and the influence of the soil particles on a detection result is avoided.

In the prior art, in order to conveniently separate soil from water, part of operators simply put filter paper in a filter funnel, pass through the filter paper and collect in a collecting container due to self gravity of the solution, although the operation method is simple, the whole filtering time is too long in a filtering mode due to self gravity, and the filtering is insufficient due to the fact that the filter paper is blocked by part of soil particles, so that the prior soil filtering structure is optimized and improved to improve the filtering efficiency and make the filtering more sufficient.

Disclosure of Invention

The utility model mainly aims to provide a rapid extraction device which is easy to operate and is efficient in filtration and suitable for nitrate nitrogen in soil, and aims to simplify the operation flow and improve the detection efficiency.

In order to achieve the aim, the utility model provides a rapid extraction device suitable for nitrate nitrogen in soil, which comprises a middle barrel, wherein the periphery of the top of the middle barrel is provided with a first external thread, the periphery of the bottom of the middle barrel is provided with a second external thread, the top of the middle barrel is connected with a top cover, the middle barrel is connected with a bottom cover, the center of the top cover is outwards provided with an internal thread channel, the internal thread channel is connected with the peripheral thread of a center rod, the top end of the center rod is connected with a rotary handle, and the bottom end of the center rod is connected with the center of a center circular plate; the center of the bottom cover is outwards provided with a water collecting channel, a first filter screen and a second filter screen are axially arranged between the middle cylinder body and the bottom cover, a filter membrane is arranged between the first filter screen and the second filter screen, and the center circular plate moves downwards and pushes soil solution downwards and sequentially passes through the first filter screen, the filter membrane and the second filter screen to flow outwards.

Preferably, the first filter screen and the second filter screen respectively comprise a peripheral ring body and a filter screen with edges embedded in the peripheral ring body.

Preferably, the filter holes of the first filter screen are larger than the filter holes of the second filter screen.

Preferably, the peripheral torus of the first filter screen and the second filter screen is made of elastic materials, and the end edge of the bottom of the middle cylinder is of an inner groove structure.

Preferably, the outer periphery edge of the center circular plate is provided with an accommodating groove, the accommodating groove is connected with the inner side of a sealing lip in a clamping manner, and the outer side of the sealing lip is connected with the inner wall surface of the middle cylinder in a sealing manner.

The utility model also discloses a rapid extraction device suitable for nitrate nitrogen in soil, which comprises a middle cylinder body, wherein the bottom of the middle cylinder body is sealed, the top of the middle cylinder body is provided with an opening, the periphery of the top of the middle cylinder body is provided with a first external thread, the top of the middle cylinder body is connected with a top cover thread, the center of the top cover is outwards provided with an internal thread channel, the internal thread channel is connected with the periphery thread of a center rod, the top end of the center rod is connected with a rotary handle, the bottom end of the center rod is fixedly connected with a third filter screen plate, the center of the bottom end of the center rod is provided with an internal thread hole, the center of a fourth filter screen plate is provided with a center connecting rod connected with the internal thread hole thread, and the third filter screen plate and the fourth filter screen plate jointly clamp a filter membrane.

Preferably, the pore size of the third screen plate is smaller than the pore size of the fourth screen plate.

Preferably, a communicating pipe is arranged outwards at the side part above the middle cylinder, and the communicating pipe can be connected with the output end of the vacuum generator, or a solution sucking pipeline penetrates through the communicating pipe and stretches into the upper part of the middle cylinder to suck the filtered solution.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

according to the technical scheme, the filter pressing structure is adopted to squeeze and filter soil solution, so that the filtering speed and efficiency of soil particles and the solution are effectively improved, the structure for clamping the filtering membrane can reliably clamp the edge or the center position of the filtering membrane, edge leakage in the squeezing and filtering process is avoided, and the filtering membrane plate and the filtering membrane are connected through squeezing and sealing or convenient disassembly, so that the installation and replacement are more convenient, and the filtering membrane can be protected through the filtering screen plate, so that the whole scheme is efficient, safe and reliable.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a part of the structure of an extraction apparatus according to embodiment 1 of the present utility model;

fig. 2 is a sectional view showing an exploded structure of an extraction device of embodiment 1 of the present utility model;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a partial enlarged view at B in FIG. 2;

fig. 5 is a schematic structural diagram of an extraction device according to embodiment 2 of the present utility model.

Reference numerals illustrate:

1. a middle cylinder; 101. a first external thread; 102. a second external thread; 2. a top cover; 201. an internally threaded passage; 202. a through hole; 3. a bottom cover; 301. a water collecting channel; 302. supporting feet; 4. a central rod; 401. rotating the handle; 402. a center circular plate; 403. an accommodating groove; 404. a sealing lip; 405. an internal threaded hole; 5. a first filter screen; 6. a filtering membrane; 7. a second filter screen; 8. an outer circle Zhou Huanti; 9. a filter screen; 10. a third screen plate; 11. a fourth screen plate; 1101. and a central connecting rod.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model provides a device suitable for rapidly extracting nitrate nitrogen in soil.

Example 1

Referring to fig. 1 to 4, a rapid extraction device for nitrate nitrogen in soil according to an embodiment of the present utility model includes a middle cylinder 1 with two ends connected, wherein the middle cylinder 1 is made of transparent material. The outer periphery of the top of the middle cylinder 1 is provided with a first external thread 101, the outer periphery of the bottom of the middle cylinder 1 is provided with a second external thread 102, the top of the middle cylinder 1 is connected with the top cover 2 in a threaded mode, and the bottom of the middle cylinder 1 is connected with the bottom cover 3 in a threaded mode. In addition, the center of the top cover 2 is provided with an internal screw passage 201 outwardly, and the internal screw passage 201 is screw-coupled to the outer circumference of the center rod 4, so that the center rod 4 can be axially moved, i.e., vertically moved up and down, with respect to the top cover 2 through the internal screw passage 201.

In order to facilitate the up-and-down movement of the center rod 4, the top end of the center rod 4 in this embodiment is connected with a rotating handle 401, so that an operator can conveniently rotate the center rod 4 to realize the up-and-down movement. The bottom end of the center rod 4 is connected to the center of the center circular plate 402, where the center circular plate 402 in this embodiment has a circular plate structure and the surface thereof is not provided with other hollow structures such as through holes, so the center circular plate 402 has a plate body structure of a sealing mechanism.

The center of the bottom cover 3 in this embodiment is provided with the water collecting channel 301 outwards, so that water can flow outwards through the water collecting channel 301, and in order to realize convenient positioning and normal operation of the whole device, the bottom cover 3 in this embodiment is provided with a plurality of supporting feet 302 to ensure the supporting effect.

Because the technical scheme of the utility model is suitable for the rapid extraction device of nitrate nitrogen in soil, the whole solution contains soil and corresponding solution liquid, in order to conveniently separate the solution from undissolved particulate matters in the soil, a first filter screen 5 and a second filter screen 7 are axially arranged between the middle cylinder 1 and the bottom cover 3, and a filter membrane 6 is arranged between the first filter screen 5 and the second filter screen 7. When the operator rotates the center rod 4 to move the center circular plate 402 downward, the soil solution can be pushed downward, and the solution can flow downward through the first filter screen 5, the filter membrane 6 and the second filter screen 7 in sequence.

The first filter screen 5 and the second filter screen 7 in this embodiment each include an outer circumferential ring 8 and a filter screen 9 with edges embedded in the outer circumferential ring. And in order to avoid clogging of the first filter 5 caused by silt in the soil, the filter holes of the first filter 5 are larger than those of the second filter 7.

Preferably, in order to improve the connection reliability between the middle cylinder 1 and the bottom cover 3 and ensure the installation reliability of the two filter screens, the peripheral annular bodies 8 of the first filter screen 5 and the second filter screen 7 in this embodiment are made of elastic materials, and the bottom end edges of the middle cylinder 1 are of an inner groove structure, so after the middle cylinder 1 is connected with the bottom cover 3, the middle cylinder 1 is pressed towards the bottom cover 3, so that part of the peripheral annular bodies 8 of the first filter screen 5 and the second filter screen 7 are deformed and enter the inner groove structure, and the middle cylinder 1 and the bottom cover 3 are fully pressed and sealed reliably.

In addition, in order to realize the tightness in the downward movement process of the center circular plate 402, the outer periphery edge of the center circular plate 402 in the embodiment is provided with a containing groove 403, and the containing groove 403 is in clamping connection with the inner side of a sealing lip 404, and the outer side of the sealing lip 404 can be in sealing connection with the inner wall surface of the middle cylinder 1.

Referring to fig. 1 to 4, when the rapid extraction device for nitrate nitrogen in soil of the present embodiment works, the bottom of the water collecting channel 301 may be connected with a switch, the corresponding switch may be turned off before filtering, the second filter screen 7, the filter membrane 6 and the first filter screen 5 are sequentially placed inside the bottom cover 3 from top to bottom, the bottom cover 3 and the middle cylinder 1 are connected in a threaded manner, then a soil sample to be detected is added to the lower portion of the middle cylinder 1, and a corresponding water body is added, so that the water body dissolves the soil as much as possible through stirring.

When the soil is dissolved, the top cover 2 communicated with the central circular plate 402 is covered on the top of the middle cylinder 1, and the central circular plate 402 can move downwards, and when the top cover 2 is fixedly connected with the top of the middle cylinder 1, the central circular plate 402 is driven to move downwards by rotating the corresponding rotating handle 401, and meanwhile, a switch connected with the bottom of the water collecting channel 301 is opened, so that the central circular plate 402 pushes the solution to move downwards, the large-particle soil can be intercepted by the first filter screen 5, and the solution can flow downwards through the filter membrane 6 and be collected in the container through the water collecting channel 301. In addition, in order to avoid the vacuum phenomenon between the top cover 2 and the center circular plate 402 due to the increasing volume, the surface of the top cover 2 of the present embodiment may be provided with a plurality of through holes 202.

Example 2

Referring to fig. 5, the device for rapidly extracting nitrate nitrogen in soil according to the embodiment of the utility model includes a middle cylinder 1, wherein the bottom of the middle cylinder 1 is of a sealing structure and the top of the middle cylinder is provided with an opening, the periphery of the top of the middle cylinder 1 is provided with a first external thread 101, so that the top of the middle cylinder 1 can be connected with a top cover 2 by threads, an internal thread channel 201 is arranged at the center of the top cover 2 outwards, a vertically arranged middle rod 4 can be connected with the internal thread channel 201 and realize axial up-and-down movement, in addition, the top end of the center rod 4 is connected with a rotary handle 401, and an operator can rotate the center rod 4 by rotating the corresponding rotary handle 401.

In order to achieve convenient filtration, the bottom end of the central rod 4 of the present embodiment is fixedly connected to the third screen plate 10, wherein the bottom end of the central rod 4 may be fixedly connected to the third screen plate 10 by welding or the like. In addition, the bottom end of the central rod 4 is provided with an internal threaded hole 405 upwards, and a fourth filter screen plate 11 is arranged below the third filter screen plate 10, the center of the fourth filter screen plate 11 is also provided with a central connecting rod 1101, and the fourth filter screen plate 11 and the third filter screen plate 10 are combined and the filter membrane 6 arranged between the fourth filter screen plate 11 and the third filter screen plate is clamped through the central connecting rod 1101. It should be noted that, since the filtering membrane 6 of the present embodiment needs to be clamped between the third filter screen plate 10 and the fourth filter screen plate 11, and the central connecting rod 1101 needs to be connected to the internal threaded hole 405, a corresponding central hole needs to be disposed at the central position of the filtering membrane 6, so as to facilitate the central connecting rod 1101 to pass through. In addition, the relative positions of the third screen plate 10 and the fourth screen plate 11 need to be provided with corresponding boss structures to clamp and fix the peripheral edge and the central hole edge of the filtering membrane 6 so as to avoid leakage in the actual filtering process.

In addition, the third screen plate 10 and the fourth screen plate 11 of the present embodiment need to hold the filtering membrane 6 and properly filter the particulate matters in the solution, so the filter holes of the third screen plate 10 set in the present embodiment are smaller than the filter hole diameters of the fourth screen plate 11, and thus the particulate matters are initially filtered by the fourth screen plate 11.

In addition, the side part above the middle cylinder 1 in the embodiment is provided with the communicating pipe 103 outwards, and the communicating pipe 103 can be connected with the output end of the vacuum generator, so that when the soil solution is subjected to pressure filtration, a certain vacuum environment is generated in the upper space, and the efficiency of filtering the solution is improved. Or a pipe for sucking the solution passes through the communicating pipe 103 and extends into the upper portion of the intermediate cylinder 1 to conveniently suck the filtered solution.

Referring to fig. 5, when the device for rapidly extracting nitrate nitrogen in soil according to the embodiment of the utility model is actually operated, a soil sample to be detected is placed in the middle cylinder 1, and is stirred uniformly after being added into a water body, so that the soil is dissolved in the water body as much as possible, and nitrate nitrogen is precipitated in the water body. The fourth screen plate 11 is screwed downwards away from the third screen plate 10, the filtering membrane is sleeved on the fourth screen plate 11, and then the filtering membrane is connected with the internal threaded holes 405 through the central connecting rod 1101, so that the fourth screen plate is connected with the third screen plate.

Through the structure, the top cover 2 is placed inside the middle cylinder 1, the top cover 2 is fastened and connected with the middle cylinder 1 through threads, and the corresponding rotary handle 401 is rotated, so that the central rod 4 drives the third filter screen plate 10, the filter membrane 6 and the fourth filter screen plate 11 to move downwards together, and the solution is gradually separated out upwards after being extruded through the filter membrane 6, wherein when being extruded and filtered, the vacuum generating device is connected with the communicating pipe 103 to improve the filter pressing efficiency, and a pipeline is adopted to pass through the communicating pipe 103 to suck the separated solution at the upper part.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the specification and drawings of the present utility model or direct/indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. The device is characterized by comprising a middle barrel, wherein a first external thread is arranged on the periphery of the top of the middle barrel, a second external thread is arranged on the periphery of the bottom of the middle barrel, the top of the middle barrel is connected with a top cover, the middle barrel is connected with a bottom cover, an internal thread channel is outwards arranged in the center of the top cover and is connected with the peripheral thread of a central rod, a rotating handle is connected to the top end of the central rod, and the bottom end of the central rod is connected with the center of a central circular plate; the center of the bottom cover is outwards provided with a water collecting channel, a first filter screen and a second filter screen are axially arranged between the middle cylinder body and the bottom cover, a filter membrane is arranged between the first filter screen and the second filter screen, and the center circular plate moves downwards and pushes soil solution downwards and sequentially passes through the first filter screen, the filter membrane and the second filter screen to flow outwards.

2. The rapid extraction device for nitrate nitrogen in soil according to claim 1, wherein the first filter screen and the second filter screen each comprise a peripheral ring body and a filter screen with edges embedded in the peripheral ring body.

3. The rapid extraction device for nitrate nitrogen in soil of claim 2 wherein the first filter screen has larger pores than the second filter screen.

4. The rapid extraction device for nitrate nitrogen in soil according to claim 3, wherein the outer circumferential ring bodies of the first filter screen and the second filter screen are made of elastic materials, and the end edges of the bottom of the middle cylinder body are of an inner groove structure.

5. The rapid extraction device for nitrate nitrogen in soil according to claim 4, wherein the outer periphery of the central circular plate is provided with a containing groove, the containing groove is connected with the inner side of a sealing lip in a clamping manner, and the outer side of the sealing lip is connected with the inner wall surface of the middle cylinder in a sealing manner.

6. The utility model provides a be applicable to quick extraction element of nitrate nitrogen in soil, a serial communication port, including middle barrel, middle barrel bottom seals and the top is equipped with the opening, middle barrel top periphery is equipped with first external screw thread, middle barrel top links to each other with the top cap screw thread, the top cap center outwards is equipped with the internal thread passageway, the internal thread passageway links to each other with center pole periphery screw thread, center pole top links to each other there is twist grip, center pole bottom and the fixed continuous of third filter screen board, center pole bottom center is equipped with the internal thread hole, fourth filter screen board center is equipped with center connecting rod and links to each other with the internal thread hole screw thread, third filter screen board and fourth filter screen board centre gripping filtration membrane jointly.

7. The rapid extraction device for nitrate nitrogen in soil according to claim 6, wherein the pore size of the third screen plate is smaller than the pore size of the fourth screen plate.

8. The rapid extraction device for nitrate nitrogen in soil according to claim 7, wherein the upper side of the middle cylinder is provided with a communicating pipe outwards, the communicating pipe can be connected with the output end of the vacuum generator, or the suction solution pipeline passes through the communicating pipe and stretches into the upper part of the middle cylinder to suck the filtered solution.