Surface soil petroleum hydrocarbon fast screening device for soil pollution investigation

Abstract

The utility model discloses a surface soil petroleum hydrocarbon quick screening device for soil pollution investigation, which belongs to the technical field of surface soil petroleum hydrocarbon quick screening and comprises a soil petroleum hydrocarbon quick screening assembly. The soil petroleum hydrocarbon fast screening assembly comprises a fast screening cart and a surface soil petroleum hydrocarbon fast screening tank installed on the top face of the fast screening cart. The surface soil sampling barrel is mounted on one side of the surface soil petroleum hydrocarbon quick screening tank and is positioned on the top surface of the quick screening trolley; the surface soil sample container is mounted on one side of the surface soil sampling barrel and is positioned on the top surface of the quick screening trolley; the surface soil sampling barrel can rotate to unload the surface soil into the surface soil sample container after lifting to drill the surface soil, and a quick screening separation assembly is arranged in an inner cavity of the surface soil petroleum hydrocarbon quick screening tank; and the inner cavity of the surface soil petroleum hydrocarbon fast screening tank is symmetrically divided into a soil petroleum hydrocarbon mixing cavity and a petroleum hydrocarbon fast screening cavity by the fast screening separation assembly.

Description

Technical Field

[0001] The utility model belongs to the technical field of surface soil petroleum hydrocarbon rapid screening, in particular to a surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation. Background Art

[0002] Topsoil (typically the layer 0-20 cm below the surface) has unique characteristics that are crucial for screening for petroleum hydrocarbons in soil. Understanding these characteristics helps us better understand why screening for petroleum hydrocarbons in topsoil differs from screening for petroleum hydrocarbons in deeper soils. Topsoil is relatively high in organic matter due to factors such as the presence of plant roots and the decay of fallen leaves. Topsoil typically contains a high organic matter content due to the accumulation of plant debris and roots in the surface layer. Organic matter serves as a nutrient source for microorganisms, promoting the biodegradation of petroleum hydrocarbons.

[0003] Solvent extraction is usually used for rapid screening of petroleum hydrocarbons. First, a suitable organic solvent (such as n-hexane or acetone) is used to extract petroleum hydrocarbons. Then, the soil sample and the solvent are mixed in a certain proportion, shaken, and allowed to stand to separate into layers. Finally, the petroleum hydrocarbons are removed from the upper layer of liquid to avoid bringing in suspended matter from the soil in the lower layer. After the petroleum hydrocarbons are discharged, they are filtered and the soil is retained.

[0004] In the field of soil pollution investigation, especially for the detection of petroleum hydrocarbon pollution, traditional detection methods have the following problems and shortcomings: the filtration process in traditional methods is often not precise enough, which affects the accuracy of the final test results. A single filtration method cannot effectively separate petroleum hydrocarbons and other impurities, resulting in inaccurate and unreliable test results. Utility Model Content

[0005] The purpose of the utility model is to provide a surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation, so as to solve the problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation, comprising a soil petroleum hydrocarbon rapid screening assembly, the soil petroleum hydrocarbon rapid screening assembly comprising a rapid screening cart, a surface soil petroleum hydrocarbon rapid screening tank mounted on the top surface of the rapid screening cart, a surface soil sampling tube mounted on one side of the surface soil petroleum hydrocarbon rapid screening tank and located on the top surface of the rapid screening cart, and a surface soil sample container mounted on one side of the surface soil sampling tube and located on the top surface of the rapid screening cart, the surface soil sampling tube being able to rotate after drilling the surface soil and unloading the surface soil into the surface soil sample container, a rapid screening partition assembly being provided in the inner cavity of the surface soil petroleum hydrocarbon rapid screening tank, the rapid screening partition assembly The components symmetrically divide the inner cavity of the surface soil petroleum hydrocarbon quick screening tank into a soil petroleum hydrocarbon mixing chamber and a petroleum hydrocarbon quick screening chamber. The quick screening partition assembly includes a quick screening partition plate positioned near one side of the connecting column and capable of being raised and lowered, and a quick screening filter frame positioned near one side of the petroleum hydrocarbon quick screening chamber. The inner cavity of the quick screening filter frame is sequentially provided with a filter screen, a filter cloth, and a filter membrane for filtering the petroleum hydrocarbon solution quickly screened out of the surface soil. The filtered petroleum hydrocarbon solution is heated to the boiling point of the solvent by distillation in a distillation tank positioned on one side of the surface soil petroleum hydrocarbon quick screening tank, causing the solvent to evaporate. The solvent is then condensed by a condenser on one side of the distillation tank for liquid collection, leaving the screened petroleum hydrocarbons.

[0007] Preferably, the top of the surface soil petroleum hydrocarbon quick screen tank is connected to a quick-release top cover by bolts, a quick screen lifting assembly is provided on the top surface of the quick-release top cover, and the bottom free end of the quick screen lifting assembly is connected to the quick screen partition plate.

[0008] Preferably, a stirring assembly is provided inside the quick-release top cover, and the bottom end of the stirring assembly extends into the soil-petroleum hydrocarbon mixing chamber.

[0009] Preferably, the quick screen lifting assembly includes an inverted U-shaped bracket welded to the top surface of the quick-release top cover, an electric lifting rod installed in the middle position of the top wall inside the U-shaped bracket, and a lifting clamping sealing plate fixed to the bottom end of the electric lifting rod.

[0010] Preferably, the lifting and clamping sealing plate is embedded in the top surface of the quick-release top cover, the top surface of the quick screen partition plate is symmetrically welded with connecting columns, and the top ends of the connecting columns are welded to the bottom surface of the lifting and clamping sealing plate.

[0011] Preferably, the stirring assembly includes a stirring motor installed on the top surface of the quick-release top cover and located above the soil-petroleum hydrocarbon mixing chamber, a stirring shaft connected to the output shaft of the stirring motor, and a stirring impeller fixed to the bottom end of the stirring shaft.

[0012] In this solution, the stirring shaft drives the stirring impeller to extend into the soil-petroleum hydrocarbon mixing chamber to fully stir the mixed surface soil and solvent.

[0013] Preferably, the rapid screening partition assembly further comprises two clamping outer frames symmetrically welded to the inner wall of the surface soil petroleum hydrocarbon rapid screening tank, and the rapid screening partition plate and the rapid screening filter frame are both clamped in the two clamping outer frames.

[0014] Preferably, a rotary unloading assembly is provided on one side of the surface soil sampling barrel, and the rotary unloading assembly includes a collar rod fixed to the circumference of the surface soil sampling barrel, a hydraulic lifting column fixed to the bottom surface of the collar rod, and a positioning telescopic vertical rod fixed to the bottom surface of the free end of the collar rod.

[0015] Preferably, the bottom end of the hydraulic lifting column is provided with a rotary motor, which is longitudinally embedded in the rapid screening trolley. A positioning plate is welded to the bottom end of the positioning telescopic vertical rod, and the positioning plate is dynamically connected to the rapid screening trolley through bolts.

[0016] Compared with the prior art, the technical effects and advantages of this utility model are:

[0017] This surface soil petroleum hydrocarbon rapid screening device for soil contamination investigations automates the entire process from soil sampling to rapid petroleum hydrocarbon screening through an integrated rapid screening cart, surface soil sampling tube, and rapid screening separator assembly, significantly improving detection efficiency. The surface soil sampling tube can be raised and lowered to drill through the surface soil and then rotated directly into the surface soil sample container. The rapid screening lift assembly then rapidly filters the petroleum hydrocarbon solution, reducing manual intervention and significantly shortening the detection cycle. A multi-stage filtration system consisting of a screen, filter cloth, and filter membrane ensures the purity of the petroleum hydrocarbon solution and improves the accuracy of test results. The rapid screening filter frame in the rapid screening separator assembly, combined with the screen, filter cloth, and filter membrane, ensures effective filtration of the petroleum hydrocarbon solution. The mixed petroleum hydrocarbon solution is heated to the boiling point of the solvent in a distillation tank to evaporate the solvent. The liquid is then condensed and collected in a condenser, leaving the screened petroleum hydrocarbons, improving the accuracy of surface soil petroleum hydrocarbon detection.

[0018] The stirring assembly's stirring motor, stirring shaft, and stirring impeller, along with the quick-screen lift assembly's electric lifting rod and lifting and clamping sealing plate, achieve efficient mixing of soil and solvent, as well as automatic filtration of petroleum hydrocarbon solutions. The integrated stirring assembly and quick-screen lift assembly deliver both soil and solvent mixing and petroleum hydrocarbon solution filtration, demonstrating its multifunctionality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 This is a schematic structural diagram of the quick screening and separation assembly of the present invention in a disassembled state;

[0022] Figure 3 This is a schematic structural diagram of the installation state of the clamping outer frame of the present invention;

[0023] Figure 4 This is a schematic structural diagram of the quick screening partition plate of the present invention in a disassembled state;

[0024] Figure 5 This is a schematic diagram of the structure of the quick screening filter frame of the utility model in a disassembled state;

[0025] Figure 6 This is a schematic structural diagram of the disassembled state of the stirring shaft of the present invention.

[0026] Description of reference numerals:

[0027] Figure: 1. Soil petroleum hydrocarbon rapid screening assembly; 2. Rapid screening cart; 3. Handrail; 4. Universal wheel; 5. Power distribution control box; 6. Surface soil petroleum hydrocarbon rapid screening tank; 7. Quick-release top cover; 8. Surface soil sampling tube; 9. Surface soil sample container; 10. Rapid screening lifting assembly; 11. Rotary unloading assembly; 12. Petroleum hydrocarbon discharge pipe; 13. U-shaped bracket; 14. Stirring assembly; 15. Rapid screening separator assembly; 16. Snap-on outer frame; 17. Rapid screening separator Plate; 18. Connecting column; 19. Rapid screening filter frame; 20. Filter screen; 21. Filter cloth; 22. Filter membrane; 23. Electric lifting rod; 24. Lifting and clamping sealing plate; 25. Stirring motor; 26. Stirring shaft; 27. Stirring impeller; 28. Soil and petroleum hydrocarbon mixing chamber; 29. ​​Petroleum hydrocarbon rapid screening chamber; 30. Ring rod; 31. Hydraulic lifting column; 32. Positioning telescopic vertical rod; 33. Positioning plate; 34. Distillation tank; 35. Condenser. DETAILED DESCRIPTION

[0028] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with the present invention.

[0029] Unless otherwise defined, the directions of up, down, left, right, front, back, inside and outside involved in this document are based on the directions of up, down, left, right, front, back, inside and outside shown in the figures of the present invention, and are explained here together.

[0030] This embodiment provides Figures 1 to 6 The surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation shown in the figure includes a soil petroleum hydrocarbon rapid screening assembly 1, which includes a rapid screening cart 2, a surface soil petroleum hydrocarbon rapid screening tank 6 installed on the top surface of the rapid screening cart 2, a surface soil sampling tube 8 installed on one side of the surface soil petroleum hydrocarbon rapid screening tank 6 and located on the top surface of the rapid screening cart 2, and a surface soil sample container 9 installed on one side of the surface soil sampling tube 8 and located on the top surface of the rapid screening cart 2. The soil petroleum hydrocarbon rapid screening assembly 1 serves as the core of the entire device, integrating all key components to ensure the overall coordinated operation of the equipment. It integrates the rapid screening cart 2, the surface soil petroleum hydrocarbon rapid screening tank 6, the surface soil sampling tube 8 and other components to achieve rapid screening and filtration of petroleum hydrocarbon solutions in the soil, improve work efficiency, simplify the operating process, and ensure the accuracy and reliability of detection.

[0031] In this embodiment, the surface soil sampling barrel 8 is raised and lowered to drill the surface soil and then rotated to unload the surface soil into the surface soil sample container 9. The surface soil petroleum hydrocarbon rapid screening tank 6 is provided with a rapid screening partition assembly 15. The rapid screening partition assembly 15 symmetrically divides the interior of the surface soil petroleum hydrocarbon rapid screening tank 6 into a soil petroleum hydrocarbon mixing chamber 28 and a petroleum hydrocarbon rapid screening chamber 29. The rapid screening partition assembly 15 includes a rapid screening partition plate 17 that is movable and raised near the connecting column 18 and a rapid screening filter frame 19 that is provided near the petroleum hydrocarbon rapid screening chamber 29. The rapid screening filter frame 19 is provided with a filter screen 20, a filter cloth 21, and a filter membrane 22 in sequence from the soil petroleum hydrocarbon mixing chamber 28 to the petroleum hydrocarbon rapid screening chamber 29 for filtering the petroleum hydrocarbons rapidly screened out of the surface soil. The surface soil petroleum hydrocarbon rapid screening tank 6 contains a soil sample and a solvent. The appropriate solvent is selected according to the actual application. Commonly used solvents include n-hexane and acetone. The surface soil petroleum hydrocarbon rapid screening tank 6 provides the enclosed space required for mixing and rapid screening, ensuring effective filtration of the petroleum hydrocarbon solution. It features a quick-release top cover 7 on top and a rapid screening divider assembly 15 inside, dividing the tank into a soil and petroleum hydrocarbon mixing chamber 28 and a petroleum hydrocarbon rapid screening chamber 29. The surface soil sampling cylinder 8 is used to obtain soil samples from the ground surface. This sampling, which extracts soil samples from the 0-20 cm layer within a specified depth, ensures the collected samples are highly representative and improves the accuracy of the test results. A rotating unloading assembly 11 is located on one side.

[0032] In this embodiment, the filter screen 20, filter cloth 21, and filter membrane 22 sequentially filter particles and impurities of varying sizes, ensuring that the petroleum hydrocarbon solution is free of solid impurities, improving the purity of the petroleum hydrocarbon solution, and guaranteeing the reliability of the test results. Plant roots and residual decomposition products in the surface soil are easily mixed with the petroleum hydrocarbon solution. These plant roots and residual decomposition products can be separated from the petroleum hydrocarbon solution through filtration. The following are some effective filtration methods. Selecting the appropriate materials for the filter screen 20, filter cloth 21, and filter membrane 22 is crucial for effectively separating petroleum hydrocarbons and plant residue decomposition products in the surface soil. The following are some descriptions of each filter medium:

[0033] The mesh size of the filter screen 20 should be selected based on the particle size to be removed. For example, a sieve with a mesh size of 2mm to 5mm can be used to remove larger plant debris. The material of the filter screen 20 should be selected based on the application. Stainless steel or polypropylene (PP) sieves offer excellent corrosion resistance and are suitable for handling petroleum hydrocarbons. Common models of filter screens 20 include ISO standard sieves and ASTM standard sieves, which typically have clearly marked apertures.

[0034] The pore size of the filter cloth 21 should be selected appropriately based on the particle size to be filtered. For example, to remove smaller plant debris, a filter cloth with a pore size of 50 to 200 μm can be used. Filter cloth 21 can be made of materials such as polyester, nylon, and polypropylene, which offer excellent chemical stability and durability. Brands such as DuPont and 3M are recommended for filter cloth 21.

[0035] The pore size of the filter membrane 22 is selected based on the size of the particles or molecules to be removed. For example, to remove extremely fine plant debris and dissolved organic matter, a microfiltration membrane with a pore size of 0.2 to 1 μm or an ultrafiltration membrane with a pore size less than 0.2 μm can be used. Common materials include polyethersulfone (PES), polyamide (PA), and polyvinylidene fluoride (PVDF). Common brands include Millipore, Pall, and Sartorius. These membrane filtration products offer excellent filtration performance and chemical stability.

[0036] In this embodiment, the top of the surface soil petroleum hydrocarbon quick screening tank 6 is connected to a quick-release top cover 7 by bolts, and a quick screen lifting assembly 10 is provided on the top surface of the quick-release top cover 7. The bottom free end of the quick screen lifting assembly 10 is connected to the quick screen partition plate 17.

[0037] In this embodiment, a stirring assembly 14 is further provided inside the quick-release top cover 7 , and the bottom end of the stirring assembly 14 extends into the soil-petroleum hydrocarbon mixing chamber 28 for mixing the mixed surface soil and solvent.

[0038] In this embodiment, the quick screen lifting assembly 10 includes an inverted U-shaped bracket 13 welded to the top surface of the quick-release top cover 7, an electric lifting rod 23 installed in the middle position of the top wall inside the U-shaped bracket 13, and a lifting clamping sealing plate 24 fixed to the bottom end of the electric lifting rod 23. The lifting clamping sealing plate 24 is embedded in the top surface of the quick-release top cover 7, and the top surface of the quick screen partition plate 17 is symmetrically welded with a connecting column 18, and the top end of the connecting column 18 is welded to the bottom surface of the lifting clamping sealing plate 24. When the electric lifting rod 23 drives the lifting and clamping sealing plate 24 to rise, the lifting and clamping sealing plate 24 lifts the quick screen partition plate 17 through the connecting column 18 to disengage the fast screen partition plate 17 from the clamping outer frame 16, thereby facilitating the flow of the petroleum hydrocarbon solution in the soil petroleum hydrocarbon mixing chamber 28 into the petroleum hydrocarbon quick screen chamber 29. When the electric lifting rod 23 drives the lifting and clamping sealing plate 24 to descend, the lifting and clamping sealing plate 24 lowers the fast screen partition plate 17 through the connecting column 18 and clamps it into the clamping outer frame 16. The quick screen lifting assembly 10 is used to lift and lower the quick screen partition plate 17, control the flow of the petroleum hydrocarbon solution, achieve filtration and separation of the petroleum hydrocarbon solution, and improve the efficiency and accuracy of the screening and filtration of the petroleum hydrocarbon solution. It includes a U-shaped bracket 13, an electric lifting rod 23, and a lifting and clamping sealing plate 24. The quick screen partition plate 17 serves as a movable partition to control the flow direction of the petroleum hydrocarbon solution and cooperates with the quick screen lifting assembly 10 to move up and down to filter the petroleum hydrocarbon solution and ensure efficient filtration and separation of the petroleum hydrocarbon solution. A connecting column 18 is symmetrically welded on the top surface.

[0039] In this embodiment, the stirring assembly 14 includes a stirring motor 25 mounted on the top surface of the quick-release cover 7 and located above the soil and petroleum hydrocarbon mixing chamber 28, a stirring shaft 26 connected to the output shaft of the stirring motor 25, and a stirring impeller 27 fixed to the bottom end of the stirring shaft 26. The stirring assembly 14 mixes the soil sample and the solvent, ensuring sufficient contact between the soil and the solvent, accelerating the dissolution of the petroleum hydrocarbons, and improving the extraction efficiency and quality of the petroleum hydrocarbon solution.

[0040] In this embodiment, the stirring shaft 26 drives the stirring impeller 27 to extend into the soil-petroleum hydrocarbon mixing chamber 28 to fully stir the mixed surface soil and solvent.

[0041] In this embodiment, the rapid screening assembly 15 further includes two snap-fit ​​outer frames 16 symmetrically welded to the inner wall of the surface soil petroleum hydrocarbon rapid screening tank 6. The rapid screening partition plate 17 and the rapid screening filter frame 19 are both snap-fitted into the two snap-fit ​​outer frames 16. The rapid screening assembly 15 divides the rapid screening tank into two independent chambers, namely a soil petroleum hydrocarbon mixing chamber 28 and a petroleum hydrocarbon rapid screening chamber 29, thereby effectively separating the petroleum hydrocarbon solution from soil particulate impurities.

[0042] In this embodiment, a rotary unloading assembly 11 is provided on one side of the surface soil sampling barrel 8. The rotary unloading assembly 11 comprises a collar rod 30 secured to the circumference of the surface soil sampling barrel 8, a hydraulic lifting column 31 secured to the bottom surface of the collar rod 30, and a positioning telescopic upright 32 secured to the bottom surface of the free end of the collar rod 30. The rotary unloading assembly 11 enables the surface soil sampling barrel 8 to rotate and unload the sample, transferring the soil in the sampling barrel to the sample container 9, simplifying the sampling barrel unloading process and improving operational efficiency.

[0043] In this embodiment, a rotary motor is provided at the bottom end of the hydraulic lifting column 31, and the rotary motor is longitudinally embedded in the quick screening trolley 2. A positioning plate 33 is welded to the bottom end of the positioning telescopic vertical rod 32, and the positioning plate 33 is dynamically connected to the quick screening trolley 2 by bolts. When it is necessary to rotate the surface soil sampling tube 8 to unload the surface soil sample sampled therein into the surface soil sample container 9, the bolts at the top of the positioning plate 33 are first removed so that the bolts are disengaged from the top surface of the quick screening trolley 2. The rotary motor drives the hydraulic lifting column 31 to rotate above the surface soil sample container 9. At this time, the positioning telescopic vertical rod 32 rotates along with it, and the hydraulic lifting column 31 drives the surface soil sampling tube 8 to rise and fall and adjust its position for unloading. After unloading is completed, the rotary motor drives the hydraulic lifting column 31 to reset. The hydraulic lifting column 31 is lifted and reset. At this time, the positioning telescopic vertical rod 32 is reset. The bolts are tightened to connect the bolts to the quick screening trolley 2 and fix the positioning plate 33. Hold the surface soil sample container 9 carrying the surface soil sample and pour the surface soil in the surface soil sample container 9 into the soil petroleum hydrocarbon mixing chamber 28. Universal wheels 4 are installed at the four corners of the bottom surface of the rapid screening cart 2. A handrail 3 is installed on the top surface of the rapid screening cart 2. A power distribution control box 5 is installed below the handrail 3 and on the top surface of the rapid screening cart 2. The top surface of the power distribution control box 5 has control buttons.

[0044] In this embodiment, the boiling point of the solvent, n-hexane, is approximately 69°C, and the boiling point of acetone is approximately 56.1°C. In contrast, petroleum hydrocarbons are a general term for a class of compounds with a wide range of boiling points, generally ranging from light components (such as gasoline, with a boiling point of approximately 150°C to 300°C) to heavy components (such as diesel, with a boiling point of approximately 200°C to 350°C). Therefore, the boiling point of petroleum hydrocarbons is higher than that of the solvents, n-hexane and acetone. The petroleum hydrocarbon solution mixture is placed in a distillation tank 34 and heated. Due to the different boiling points of the petroleum hydrocarbons and the solvent, the solvent (which has a lower boiling point than the petroleum hydrocarbons) evaporates first. As the temperature rises, the solvent gradually turns into vapor, which then cools down to a liquid through the condenser tube of condenser 35. During this process, the solvent is collected. Heating is continued until all the solvent has evaporated and is condensed and collected. At this point, the remaining substance is primarily the petroleum hydrocarbons with higher boiling points. When heating is stopped and the mixture no longer produces vapor, the substance remaining in the distillation tank 34 is petroleum hydrocarbons. The petroleum hydrocarbon solution mixture is physically filtered (filter screen 20, filter cloth 21, filter membrane 22) and then distilled to remove solid impurities suspended in the solution, helping to improve the quality and purity of the final petroleum hydrocarbons and improve the rapid screening efficiency of petroleum hydrocarbons.

[0045] Working principle: This soil pollution investigation uses a surface soil petroleum hydrocarbon rapid screening device. Move the soil petroleum hydrocarbon rapid screening device to the designated testing location, check whether the power supply in the power distribution control box 5 is normal, ensure that all electrical components are in good condition, check whether the surface soil sampling tube 8 is clean and intact, and prepare to start sampling. Use the surface soil sampling tube 8 to drill the surface soil sample (an auger blade is installed in the inner cavity of the surface soil sampling tube 8 for rotation, and the top of the surface soil sampling tube 8 has a motor that drives the auger blade to rotate and drill the soil). Loosen the connecting bolts between the positioning plate 33 in the rotary unloading assembly 11 and the rapid screening cart 2. Control the hydraulic lifting column 31 and the positioning telescopic vertical rod 32 through the rotary motor to rotate and adjust the position of the surface soil sampling tube 8. Unload the soil sample into the surface soil sample container 9. After the adjustment is completed, retighten the connecting bolts between the positioning plate 33 and the rapid screening cart 2 to fix the positioning plate 33.

[0046] The soil in the surface soil sample container 9 containing the soil sample is poured into the soil petroleum hydrocarbon mixing chamber 28 of the surface soil petroleum hydrocarbon quick screening tank 6, and an appropriate amount of solvent is added to dissolve the petroleum hydrocarbon. The quick-release top cover 7 is closed and ensured to be sealed. The stirring motor 25 is started, and the stirring shaft 26 drives the stirring impeller 27 to rotate to fully stir the soil and solvent to ensure that the petroleum hydrocarbon can be completely dissolved in the solvent. After the soil and solvent are fully mixed, the electric lifting rod 23 is started to drive the lifting and clamping sealing plate 24 to rise. The lifting and clamping sealing plate 24 lifts the quick screening partition plate 17 from the clamping outer frame 16 through the connecting column 18, so that the petroleum hydrocarbon solution in the soil petroleum hydrocarbon mixing chamber 28 can pass through the filter screen 20, the filter cloth 21 and the filter membrane 22 into the petroleum hydrocarbon quick screening chamber 29. After the petroleum hydrocarbon solution undergoes multi-stage filtration, the quick screening partition plate 17 descends and is re-clamped into the clamping outer frame 16 to maintain the seal.

[0047] The filtered petroleum hydrocarbon solution remains in the petroleum hydrocarbon quick screen chamber 29 and can be collected into a distillation tank through the petroleum hydrocarbon drain pipe 12 and the pipeline for distillation and heating to the boiling point of the solvent to evaporate the solvent. The liquid is then condensed and collected through a condenser, leaving the screened petroleum hydrocarbons for further processing or analysis. The remaining soil and solvent remain in the soil petroleum hydrocarbon mixing chamber 28 and can be removed through a cleaning operation. The soil petroleum hydrocarbon mixing chamber 28 and the petroleum hydrocarbon quick screen chamber 29 are cleaned to ensure that there is no residual material that affects the next use. The quick screen partition assembly 15, including the quick screen partition plate 17 and the quick screen filter frame 19, is reset. The quick-release top cover 7 is closed and ensured to be sealed. All components are checked to see if they are intact and ready for the next use.

[0048] It should be noted that, in this article, relational terms such as one and two are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "including an element defined by ... does not exclude the presence of other identical elements in the process, method, article or device that includes the element."

[0049] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation, comprising a soil petroleum hydrocarbon rapid screening assembly (1), characterized in that: The soil petroleum hydrocarbon quick screening assembly (1) comprises a quick screening cart (2), a surface soil petroleum hydrocarbon quick screening tank (6) mounted on the top surface of the quick screening cart (2), a surface soil sampling tube (8) mounted on one side of the surface soil petroleum hydrocarbon quick screening tank (6) and located on the top surface of the quick screening cart (2), and a surface soil sample container (9) mounted on one side of the surface soil sampling tube (8) and located on the top surface of the quick screening cart (2). After the surface soil sampling tube (8) is raised and lowered to drill the surface soil, it can be rotated to unload the surface soil into the surface soil sample container (9). A quick screening partition assembly (15) is provided in the inner cavity of the surface soil petroleum hydrocarbon quick screening tank (6). The quick screening partition assembly (15) symmetrically divides the inner cavity of the surface soil petroleum hydrocarbon quick screening tank (6) into a soil petroleum hydrocarbon mixing chamber (28) and a petroleum hydrocarbon quick screening chamber. The quick screen separation assembly (15) includes a quick screen separation plate (17) that is close to the side of the connecting column (18) and can be lifted and lowered, and a quick screen filter frame (19) that is arranged close to the side of the petroleum hydrocarbon quick screen chamber (29). The inner cavity of the quick screen filter frame (19) is provided with a filter screen (20), a filter cloth (21) and a filter membrane (22) for filtering the petroleum hydrocarbon solution quickly screened out from the surface soil in sequence from the soil petroleum hydrocarbon mixing chamber (28) to the petroleum hydrocarbon quick screen chamber (29). The filtered petroleum hydrocarbon solution is heated to the boiling point of the solvent by distillation in a distillation tank (34) that is arranged on one side of the surface soil petroleum hydrocarbon quick screen tank (6), so that the solvent evaporates, and then condensed by a condenser (35) on one side of the distillation tank (34) for liquid collection, leaving the screened petroleum hydrocarbon.

2. The surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation according to claim 1, characterized in that: The top of the surface soil petroleum hydrocarbon quick screening tank (6) is connected to a quick-detachable top cover (7) via bolts, a quick-screen lifting assembly (10) is provided on the top surface of the quick-detachable top cover (7), and the bottom free end of the quick-screen lifting assembly (10) is connected to a quick-screen partition plate (17).

3. The surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation according to claim 2, characterized in that: A stirring assembly (14) is further provided inside the quick-release top cover (7), and the bottom end of the stirring assembly (14) extends into the soil-petroleum hydrocarbon mixing chamber (28).

4. The surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation according to claim 3, characterized in that: The quick screen lifting assembly (10) comprises an inverted U-shaped bracket (13) welded to the top surface of the quick-release top cover (7), an electric lifting rod (23) installed in the middle position of the top wall inside the U-shaped bracket (13), and a lifting clamping sealing plate (24) fixed to the bottom end of the electric lifting rod (23).

5. The surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation according to claim 4, characterized in that: The lifting clamping sealing plate (24) is embedded in the top surface of the quick-release top cover (7), and a connecting column (18) is symmetrically welded to the top surface of the quick-screen partition plate (17), and the top end of the connecting column (18) is welded to the bottom surface of the lifting clamping sealing plate (24).

6. The surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation according to claim 5, characterized in that: The stirring assembly (14) comprises a stirring motor (25) mounted on the top surface of the quick-release top cover (7) and located above the soil-petroleum hydrocarbon mixing chamber (28), a stirring shaft (26) connected to the output shaft of the stirring motor (25), and a stirring impeller (27) fixed to the bottom end of the stirring shaft (26).

7. The surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation according to claim 6, characterized in that: The stirring shaft (26) drives the stirring impeller (27) to extend into the soil-petroleum hydrocarbon mixing chamber (28) to fully stir the mixed surface soil and solvent.

8. The surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation according to claim 7, characterized in that: The quick screen partition assembly (15) further comprises two clamping outer frames (16) symmetrically welded to the inner wall of the surface soil petroleum hydrocarbon quick screen tank (6), and the quick screen partition plate (17) and the quick screen filter frame (19) are both clamped in the two clamping outer frames (16).

9. The surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation according to claim 8, characterized in that: A rotary unloading assembly (11) is provided on one side of the surface soil sampling cylinder (8), and the rotary unloading assembly (11) comprises a collar rod (30) fixed to the circumference of the surface soil sampling cylinder (8), a hydraulic lifting column (31) fixed to the bottom surface of the collar rod (30), and a positioning telescopic vertical rod (32) fixed to the bottom surface of the free end of the collar rod (30).

10. The surface soil petroleum hydrocarbon rapid screening device for soil pollution investigation according to claim 9, characterized in that: A rotary motor is provided at the bottom end of the hydraulic lifting column (31), and the rotary motor is longitudinally embedded in the rapid screening trolley (2). A positioning plate (33) is welded to the bottom end of the positioning telescopic vertical rod (32), and the positioning plate (33) is dynamically connected to the rapid screening trolley (2) through bolts.

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