Soil heavy metal content detection device for environment detection

Abstract

The invention provides a soil heavy metal content detection device for environmental detection, and relates to the technical field of soil sample preparation and test.The soil heavy metal content detection device comprises a detection device body, the detection device body comprises a sample preparation table, a digestion tank, a crushing assembly and a stirring mechanism, the bottom of the sample preparation table is in threaded connection with a driving base, and a rotating disc is welded to the top of the driving base; a digestion groove is formed in the bottom of the rotary disc, the digestion groove is embedded into the surface of the rotary disc, a sampling assembly is inserted into one end of the inner side of the digestion groove, the sampling assembly and the digestion groove are of a separable structure, and a stirring mechanism is in threaded connection with the surface of the sample preparation table. The digestion efficiency is improved, meanwhile, the quantitative process can be rapidly completed, more digestion solution samples can be prepared at a time, the safety during bottom stirring is higher, the digestion solution samples are taken more uniformly every time, and the error value of multiple measurements is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of soil sample preparation and testing, in particular to a soil heavy metal content detection device for environmental detection. Background Art

[0002] The main purpose of soil heavy metal content detection is to ensure the quality and safety of agricultural products, protect the environment and human health, promote sustainable agricultural development and reduce economic losses. The accumulation of heavy metals in the soil will affect the community structure and function of soil microorganisms, reduce soil fertility and biological activity, and enter the human body through the food chain, posing a potential threat to human health. Soil heavy metal detection equipment can provide accurate data support for environmental protection departments, help formulate scientific and reasonable soil pollution control plans, reduce the damage of soil pollution to the ecological environment, and protect human health.

[0003] In the prior art, soil digestion treatment is required before the heavy metal content in soil is detected. The digestion schemes include wet digestion, high pressure digestion, and microwave digestion. The wet digestion equipment is simple, easy to operate, has a short working cycle, and can process samples in large quantities. However, when the soil is treated by wet digestion in the prior art, the solution needs to be stirred for a long time, and splashing is likely to occur during the stirring process, so the safety is insufficient. Moreover, the sample solution after digestion will also produce stratification. Therefore, when taking part of the solution sample from the digestion solution, it is easy to cause large errors between the results of multiple measurements due to the stratification phenomenon, and the accuracy is insufficient. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a soil heavy metal content detection device for environmental detection to solve the problems raised in the above-mentioned background technology. The present invention can grind and crush the soil and transport the crushed soil to the annular digestion tank at the bottom, thereby improving the digestion efficiency and quickly completing the quantitative process. More digestion solution samples can be prepared in a single time, the bottom stirring is safer, and the digestion solution samples are taken more evenly each time, thereby reducing the error value of multiple measurements.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a soil heavy metal content detection device for environmental detection, including a detection device body, the detection device body including a sample preparation table, a digestion tank, a crushing assembly and a stirring mechanism, the bottom of the sample preparation table is screwed with a driving base, the top of the driving base is welded with a rotating disk, the digestion tank is embedded in the surface of the rotating disk, the inner end of the digestion tank is inserted with a sampling assembly, and the sampling assembly and the digestion tank are in a detachable structure, the surface of the sample preparation table is screwed with a stirring mechanism, the end of the stirring mechanism is embedded in the interior of the digestion tank, the rear end of the sample preparation table is welded with a bracket, the top of the bracket is screwed with a driving mechanism, the end of the driving mechanism is inserted into the interior of the crushing assembly, the bottom of the crushing assembly is inserted with a guide vertebrae plate, the bottom of the guide vertebrae plate is embedded in the middle area of ​​the digestion tank, and the outer side of the crushing assembly is fixed by plugging with the surface of the bracket through a rod.

[0006] Furthermore, the crushing assembly includes a crushing chamber and a partition, the partition is welded to the inner wall of the crushing chamber, and a plurality of scraping grooves are provided on the surface of the partition, a quantitative channel is provided in the middle of the guide vertebrae, and an electric heating plate is installed at the bottom of the guide vertebrae.

[0007] Furthermore, the top of the quantitative channel is in an open state, a support plate is welded to the bottom of the quantitative channel, a pressure module is embedded on the surface of the support plate, and the crushing assembly is used to place the soil sample to be tested inside and crush it.

[0008] Furthermore, the driving mechanism includes a motor and a pressure plate, a driving shaft is inserted into the output end of the motor, a convex strip is welded on the surface of the driving shaft, a transmission sleeve is opened in the middle of the pressure plate, a plug-in hole is opened on the surface of the pressure plate, a pull rod is inserted into the inside of the plug-in hole, and a plug-in plate is welded at the end of the pull rod.

[0009] Furthermore, the bottom of the plug-in plate is used to be embedded in the interior of the soil to be tested, the pressure plate is pressed on the surface of the soil to be tested, and the side of the pressure plate is in contact with the inner wall of the crushing bin, the drive shaft is inserted into the inner side of the transmission sleeve, and the convex strip is embedded in the inner wall of the transmission sleeve, and the outer shell of the motor is screwed to the top of the bracket.

[0010] Furthermore, the sampling assembly includes a sampling sleeve and an extraction plate, an annular cavity is opened inside the digestion tank, a plurality of docking rings are opened at the bottom of the annular cavity, and a center column is arranged on the inner side of the docking ring, the electric heating plate is embedded in the middle position of the digestion tank, and the electric heating plate is in contact with the inner wall of the digestion tank.

[0011] Furthermore, an external thread is provided at the outer bottom of the sampling sleeve, the extraction plate is embedded in the interior of the sampling sleeve, a sampling pipe is inserted at the top of the extraction plate, and the side of the extraction plate is in contact with the inner wall of the sampling sleeve.

[0012] Furthermore, the sampling sleeve is embedded into the interior of the docking ring through an external thread, the diameter of the central column is the same as the inner wall diameter of the sampling sleeve, and the central column and the docking ring are evenly distributed along the annular cavity.

[0013] Furthermore, the stirring mechanism includes a support seat and an arc-shaped baffle, a stirring frame is welded to the end of the support seat, a stirring rod is integrally formed at the bottom of the stirring frame, and a sliding groove is provided on the surface of the support seat.

[0014] Furthermore, an extension plate is integrally formed at the rear end of the arc-shaped baffle, and the bottom of the extension plate is embedded into the interior of the slide groove through a protrusion. The stirring frame and the stirring rod are both embedded in the interior of the digestion tank, and the sides of the stirring frame and the stirring rod are in contact with the inner wall of the annular cavity.

[0015] Beneficial effects of the present invention:

[0016] 1. The soil heavy metal content detection device for environmental testing directly grinds and crushes the soil samples in blocks with the crushing components through the driving mechanism at the top, and transports the crushed soil to the annular digestion tank at the bottom, which improves the digestion efficiency and can quickly complete the quantitative process, so that more digestion solution samples can be prepared at a single time.

[0017] 2. After the initial digestion is completed, the soil heavy metal content detection device for environmental testing can drive the digestion tank to rotate by controlling the rotating disk at the bottom. At this time, the stirring mechanism at one end can be used to stir the solution that has completed the initial digestion. The entire stirring process can avoid splashing, so the stirring is safer.

[0018] 3. After the soil heavy metal content detection device for environmental testing completes stirring, it will use the sampling component to realize the process of taking a large amount of digestion solution prepared in the digestion tank, and each sampling can ensure that solutions of different depths are extracted in equal proportion at the same time. Therefore, each time the digestion solution sample is taken, it is more uniform, which reduces the error value of multiple measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a soil heavy metal content detection device for environmental detection according to the present invention;

[0020] Figure 2 It is a schematic diagram of the installation of the driving mechanism and the crushing component of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the driving mechanism part of the present invention;

[0022] Figure 4 The figure is a disassembled diagram of the crushing component part of the present invention;

[0023] Figure 5 is an internal cross-sectional view of the digestion tank of the present invention;

[0024] Figure 6 for Figure 1 A magnified image of area A;

[0025] Figure 7 It is a structural schematic diagram of the stirring mechanism part of the present invention;

[0026] In the figure: 1, sample preparation table; 2, driving base; 3, rotating disk; 4, bracket; 5, driving mechanism; 6, crushing component; 7, stirring mechanism; 8, sampling component; 9, digestion tank; 10, guide vertebral plate; 11, motor; 12, driving shaft; 13, convex strip; 14, pressing plate; 15, plug-in hole; 16, pull rod; 17, plug-in plate; 18, transmission sleeve; 19, partition; 20, scraper groove; 21, quantitative channel; 22, support plate; 23, pressure module; 24, center column; 25, docking ring; 26, sampling sleeve; 27, extraction plate; 28, sampling pipeline; 29, external thread; 30, annular cavity; 31, support seat; 32, slide groove; 33, arc baffle; 34, extension plate; 35, stirring frame; 36, stirring rod; 37, electric heating plate; 38, crushing bin. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] See also Figures 1 to 7The present invention provides the following technical solutions: a soil heavy metal content detection device for environmental detection, comprising a detection device body, the detection device body comprising a sample preparation table 1, a digestion tank 9, a crushing assembly 6 and a stirring mechanism 7, the bottom of the sample preparation table 1 is screwed with a driving base 2, the top of the driving base 2 is welded with a rotating disk 3, the digestion tank 9 is embedded in the surface of the rotating disk 3, the inner end of the digestion tank 9 is inserted with a sampling assembly 8, and the sampling assembly 8 and the digestion tank 9 are in a detachable structure, the surface of the sample preparation table 1 is screwed with a stirring mechanism 7, the end of the stirring mechanism 7 is embedded in the digestion tank 9, the rear end of the sample preparation table 1 is welded with a bracket 4, the top of the bracket 4 is screwed with a driving mechanism 5, the end of the driving mechanism 5 is inserted into the crushing assembly 6, the bottom of the crushing assembly 6 is inserted with a guide vertebrae 10, the bottom of the guide vertebrae 10 is embedded in the middle area of ​​the digestion tank 9, and the outer side of the crushing assembly 6 is fixed by plugging with the surface of the bracket 4 through a rod. The soil heavy metal content detection device for environmental testing is used to liquefy the soil sample by wet digestion before testing. Wet digestion uses the oxidizing property of strong acid to dissolve organic matter, and uses hydrofluoric acid to destroy the structure of silicon oxide crystals, thereby releasing the elements to be tested.

[0029] When the present invention is used, the pressing plate 14 in the driving mechanism 5 is manually moved up, and then the block soil sample is placed inside the crushing component 6 component, the pressing plate 14 is released, and the pressing plate 14 is pressed against the inside of the crushing component 6, and the motor 11 is started, so that the block soil can be crushed, and the soil is dropped into the digestion tank 9 at the bottom during the crushing process, and the soil in the digestion tank 9 is directly contacted with the digestion solution through the powdered soil, and the initial digestion process is tried. With the progress of crushing, the pressure module 23 inside the guide vertebral plate 10 automatically determines the amount of sample that has been put into the digestion solution, and the driving mechanism 5 at the top is controlled to stop, so that the sample can be put, and then the stirring component is manually controlled to complete the docking with the digestion tank 9, and the driving base 2 at the bottom is started to drive the digestion tank 9 to rotate to complete the stirring process, and finally the sample solution inside the digestion tank 9 can be taken out by the sampling component 8, and the subsequent detection process is carried out. The subsequent detection is completed by spectroscopy, which is a method for determining the content of elements based on the absorption characteristics of atoms to light of a specific wavelength. In soil heavy metal detection, the soil sample is digested to convert the heavy metal elements in it into ions. Then, the sample solution is introduced into the atomic absorption spectrometer, and the light source emits light of a specific wavelength and irradiates it onto the sample. The atoms of the heavy metal elements absorb the light of a specific wavelength, thereby weakening the intensity of the light. Based on the degree of light absorption, the content of heavy metal elements in the soil can be calculated.

[0030] In this embodiment, the crushing assembly 6 includes a crushing chamber 38 and a partition 19, the partition 19 is welded on the inner wall of the crushing chamber 38, and a plurality of scraping grooves 20 are provided on the surface of the partition 19, a quantitative channel 21 is provided in the middle of the guide vertebrae 10, and an electric heating plate 37 is installed at the bottom of the guide vertebrae 10. The top of the quantitative channel 21 is in an open state, a support plate 22 is welded on the bottom of the quantitative channel 21, and a pressure module 23 is embedded on the surface of the support plate 22. The crushing assembly 6 is used to place the soil sample to be tested inside and crush it. The driving mechanism 5 includes a motor 11 and a pressing plate 14, a driving shaft 12 is inserted at the output end of the motor 11, a convex strip 13 is welded on the surface of the driving shaft 12, a transmission sleeve 18 is provided in the middle of the pressing plate 14, a plug hole 15 is provided on the surface of the pressing plate 14, a pull rod 16 is inserted inside the plug hole 15, and a plug plate 17 is welded at the end of the pull rod 16. The bottom of the plug plate 17 is used to be embedded in the soil to be tested, the pressing plate 14 is pressed on the surface of the soil to be tested, and the side of the pressing plate 14 is in contact with the inner wall of the crushing chamber 38, the driving shaft 12 is inserted into the inner side of the transmission sleeve 18, and the convex strip 13 is embedded in the inner wall of the transmission sleeve 18, and the outer shell of the motor 11 is screwed to the top of the bracket 4. The block soil sample is directly ground and crushed by the driving mechanism 5 at the top in conjunction with the crushing assembly 6, and the crushed soil is transported to the annular digestion tank 9 at the bottom, which improves the efficiency of digestion and can also quickly complete the quantitative process, so that more digestion solution samples can be prepared at a single time.

[0031] Specifically, the block of soil is placed inside the crushing bin 38, and after the motor 11 is started, the drive shaft 12 is driven to rotate. The drive shaft 12 drives the pressing plate 14 to rotate through the convex strip 13 and the transmission sleeve 18. When the pressing plate 14 is placed inside the crushing bin 38, it will move down with the help of the pull rod 16 to embed the plug-in plate 17 into the inside of the soil. Therefore, after the pressing plate 14 is driven to rotate by the transmission sleeve 18, the soil inside can be driven to rotate under the action of the plug-in plate 17, and the soil can be rotated along the bottom partition 19 by friction with the pressing effect of the pressing plate 14, and then the soil can be scraped with the help of the scraper 20. Part of the soil powder is ground and crushed, and is evenly scattered toward the bottom through the scraper groove 20, while most of the scattered soil powder rolls toward the side along the guide vertebrae 10, and finally falls directly into the digestion solution along the inner arc area of ​​the annular cavity 30, while a small part of the soil powder in the middle falls directly into the quantitative channel 21 of the guide vertebrae 10, and since the diameter ratio of the quantitative channel 21 and the crushing chamber 38 is fixed, the amount of soil falling into the annular cavity 30 can be calculated proportionally by detecting the amount of soil falling inside the quantitative channel 21 with the help of the pressure module 23, thereby achieving the quantitative purpose.

[0032] In this embodiment, the sampling assembly 8 includes a sampling sleeve 26 and an extraction plate 27. An annular cavity 30 is provided inside the digestion tank 9. A plurality of docking rings 25 are provided at the bottom of the annular cavity 30, and a central column 24 is provided inside the docking ring 25. The electric heating plate 37 is embedded in the middle of the digestion tank 9, and the electric heating plate 37 is in contact with the inner wall of the digestion tank 9. An external thread 29 is provided at the bottom of the outer side of the sampling sleeve 26, and the extraction plate 27 is embedded in the sampling sleeve 26. A sampling pipe 28 is inserted at the top of the extraction plate 27, and the side of the extraction plate 27 is in contact with the inner wall of the sampling sleeve 26. The sampling sleeve 26 is embedded in the docking ring 25 through the external thread 29. The diameter of the central column 24 is the same as the inner wall diameter of the sampling sleeve 26, and the central column 24 and the docking ring 25 are evenly distributed along the annular cavity 30. After stirring is completed, the sampling component 8 will be used to take a large amount of digestion solution prepared in the digestion tank 9, and each sampling can ensure that solutions of different depths are extracted in equal proportions at the same time. Therefore, each time the digestion solution sample is taken, it is more uniform, which reduces the error value of multiple measurements.

[0033] Specifically, after digestion is completed, the sampling sleeve 26 is directly embedded into the annular cavity 30, and docked with one of the docking rings 25, and locked using the external thread 29. At this time, the extraction plate 27 is controlled to move downward, and the external piston extraction structure is cooperated to completely extract the solution part enclosed by the sampling sleeve 26 on the inside, thereby ensuring that any depth of solution within a fixed range can be extracted. When sampling multiple times in the future, the extraction is repeated through this scheme to ensure that the ratio of the upper and lower layers of solution extracted each time is always kept fixed. In the process of the soil being dispersed and dropped into the annular cavity 30 by the crushing component 6, the sampling sleeve 26 can be taken out to avoid obstruction to the falling of the soil.

[0034] In this embodiment, the stirring mechanism 7 includes a support seat 31 and an arc-shaped baffle 33. A stirring frame 35 is welded at the end of the support seat 31. A stirring rod 36 is integrally formed at the bottom of the stirring frame 35. A slide groove 32 is provided on the surface of the support seat 31. An extension plate 34 is integrally formed at the rear end of the arc-shaped baffle 33. The bottom of the extension plate 34 is embedded into the interior of the slide groove 32 through a protrusion. The stirring frame 35 and the stirring rod 36 are both embedded into the interior of the digestion tank 9, and the sides of the stirring frame 35 and the stirring rod 36 are in contact with the inner wall of the annular cavity 30. After the initial digestion is completed, the digestion tank 9 can be driven to rotate by controlling the rotating disk at the bottom. At this time, the stirring mechanism 7 at one end can be used to stir the solution that has completed the initial digestion. The entire stirring process can avoid splashing, so the safety during stirring is higher.

[0035] Specifically, after the soil is dispersed and falls to the bottom, the arc-shaped baffle 33 is manually pulled to move until it covers the top of one end of the annular cavity 30. At this time, the driving base 2 at the bottom is started, and the entire digestion tank 9 is driven to rotate with the help of the rotating disk 3. The solution inside the annular cavity 30 can be stirred with the help of the stirring frame 35 and the stirring rod 36 at the end, and is shielded by the top arc-shaped baffle 33 to prevent the solution from splashing outward during the stirring process. During the entire stirring process, heating is always provided from the inside of the digestion tank 9 through the electric heating plate 37 to ensure the completion of the digestion process.

[0036] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A soil heavy metal content detection device for environmental detection, comprising a detection device body, characterized in that: The detection device body comprises a sample preparation table (1), a digestion tank (9), a crushing assembly (6) and a stirring mechanism (7); the bottom of the sample preparation table (1) is screwed with a driving base (2); the top of the driving base (2) is welded with a rotating disk (3); the digestion tank (9) is embedded in the surface of the rotating disk (3); a sampling assembly (8) is inserted at one end of the inner side of the digestion tank (9), and the sampling assembly (8) and the digestion tank (9) are in a detachable structure; the surface of the sample preparation table (1) is screwed with the stirring mechanism (7); The end of the stirring mechanism (7) is embedded in the digestion tank (9), the rear end of the sample preparation table (1) is welded with a bracket (4), the top of the bracket (4) is screwed with a driving mechanism (5), the end of the driving mechanism (5) is inserted into the inside of the crushing component (6), the bottom of the crushing component (6) is inserted with a guide vertebral plate (10), the bottom of the guide vertebral plate (10) is embedded in the middle area of ​​the digestion tank (9), and the outer side of the crushing component (6) is fixed by plugging with the surface of the bracket (4) through a rod.

2. The soil heavy metal content detection device for environmental detection according to claim 1, characterized in that: The crushing assembly (6) comprises a crushing chamber (38) and a partition (19), wherein the partition (19) is welded to the inner wall of the crushing chamber (38), and a plurality of scraping grooves (20) are provided on the surface of the partition (19), a quantitative channel (21) is provided in the middle of the guide vertebral plate (10), and an electric heating plate (37) is installed at the bottom of the guide vertebral plate (10).

3. The soil heavy metal content detection device for environmental detection according to claim 2, characterized in that: The top of the quantitative channel (21) is in an open state, a support plate (22) is welded to the bottom of the quantitative channel (21), a pressure module (23) is embedded on the surface of the support plate (22), and the crushing component (6) is used to place the soil sample to be tested inside and crush it.

4. The soil heavy metal content detection device for environmental detection according to claim 2, characterized in that: The driving mechanism (5) comprises a motor (11) and a pressure plate (14), wherein a driving shaft (12) is inserted into the output end of the motor (11), a convex strip (13) is welded on the surface of the driving shaft (12), a transmission sleeve (18) is provided in the middle of the pressure plate (14), a plug-in hole (15) is provided on the surface of the pressure plate (14), a pull rod (16) is inserted into the plug-in hole (15), and a plug-in plate (17) is welded at the end of the pull rod (16).

5. The soil heavy metal content detection device for environmental detection according to claim 4, characterized in that: The bottom of the plug plate (17) is used to be embedded in the interior of the soil to be tested, the pressure plate (14) is pressed on the surface of the soil to be tested, and the side of the pressure plate (14) is in contact with the inner wall of the crushing chamber (38), the drive shaft (12) is inserted into the inner side of the transmission sleeve (18), and the convex strip (13) is embedded in the inner wall of the transmission sleeve (18), and the outer shell of the motor (11) is screwed to the top of the bracket (4).

6. The soil heavy metal content detection device for environmental detection according to claim 5, characterized in that: The sampling assembly (8) comprises a sampling sleeve (26) and an extraction plate (27); an annular cavity (30) is provided inside the digestion tank (9); a plurality of docking rings (25) are provided at the bottom of the annular cavity (30); a central column (24) is provided inside the docking ring (25); the electric heating plate (37) is embedded in the middle position of the digestion tank (9), and the electric heating plate (37) is in contact with the inner wall of the digestion tank (9).

7. The soil heavy metal content detection device for environmental detection according to claim 6, characterized in that: The outer bottom of the sampling sleeve (26) is provided with an external thread (29), the extraction plate (27) is embedded in the interior of the sampling sleeve (26), the top of the extraction plate (27) is inserted with a sampling pipe (28), and the side of the extraction plate (27) is in contact with the inner wall of the sampling sleeve (26).

8. The soil heavy metal content detection device for environmental detection according to claim 7, characterized in that: The sampling sleeve (26) is embedded in the interior of the docking ring (25) through an external thread (29); the diameter of the central column (24) is the same as the inner wall diameter of the sampling sleeve (26); and the central column (24) and the docking ring (25) are evenly distributed along the annular cavity (30).

9. The soil heavy metal content detection device for environmental detection according to claim 6, characterized in that: The stirring mechanism (7) comprises a support seat (31) and an arc-shaped baffle (33); a stirring frame (35) is welded to the end of the support seat (31); a stirring rod (36) is integrally formed at the bottom of the stirring frame (35); and a sliding groove (32) is provided on the surface of the support seat (31).

10. The soil heavy metal content detection device for environmental detection according to claim 9, characterized in that: An extension plate (34) is integrally formed at the rear end of the arc-shaped baffle (33), and the bottom of the extension plate (34) is embedded into the interior of the slide groove (32) through a protrusion. The stirring frame (35) and the stirring rod (36) are both embedded in the interior of the digestion tank (9), and the side edges of the stirring frame (35) and the stirring rod (36) are in contact with the inner wall of the annular cavity (30).

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