Sampling device for treatment of soil polluted by polycyclic aromatic hydrocarbon

Abstract

The invention belongs to the technical field of environmental governance and soil sampling equipment, and particularly relates to a polycyclic aromatic hydrocarbon contaminated soil governance sampling device which comprises a rotatable sampling head and a controller, the output end of the sampling head is connected with an openable container, and the side wall of the output end of the sampling head is slidably connected with an automatic sealing mechanism. The automatic sealing mechanism comprises a switching driving assembly and a packaging driving assembly, and the input end of the container is connected with a cleaning mechanism. The structure is convenient to use, the sampling efficiency of the polycyclic aromatic hydrocarbon polluted soil is improved, the detection effect is enhanced, a sampling-packaging-cleaning mode closed loop is realized, and the detection accuracy is enhanced.

Description

Technical Field

[0001] This invention belongs to the technical field of environmental remediation and soil sampling equipment, specifically relating to a sampling device for remediation of polycyclic aromatic hydrocarbon contaminated soil. Background Technology

[0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent organic pollutants widely found in the environment, exhibiting strong carcinogenic, teratogenic, and mutagenic effects. Before and after remediation of PAH-contaminated soil (such as chemical oxidation and bioremediation), precise soil sampling is necessary to assess the degree of contamination and remediation effectiveness. Currently, soil sampling often employs manual samplers (such as bamboo shovels or stainless steel shovels) or simple mechanical drilling devices. These traditional methods result in residual contaminated soil adhering to the sampling head after each sampling. If this is not thoroughly cleaned before the next sampling, high-concentration pollutants can easily be carried into low-concentration or already remediated areas, leading to severely distorted test data and misleading assessments of remediation effectiveness. Furthermore, PAHs are semi-volatile and exhibit highly heterogeneous distribution. Traditional open sampling and transfer processes easily lead to the loss of volatile components; simultaneously, the soil structure is damaged during sampling, making it difficult to maintain the integrity of the undisturbed columnar sample, affecting the accuracy of pollutant spatial distribution analysis. During sampling and dispensing, operators are directly exposed to dust and volatile gases containing highly toxic pollutants, posing significant occupational health and safety hazards. To ensure sample quality, a single set of sterile tools is typically required at each sampling point, or frequent, time-consuming cleaning and disinfection procedures are necessary, which greatly reduces work efficiency in large-scale site surveys.

[0003] In the prior art, patent CN120063782B discloses a soil sampling device, including a sampling component for soil sampling and a driving mechanism for clearing excess soil. This arrangement can cut and remove excess soil during soil sampling, ensuring soil compaction. However, there are still areas for improvement: First, the soil sampling and collection are achieved through the cooperation of the cutting component and the soil collection component, resulting in poor sealing and a high risk of cross-contamination, reducing the accuracy of testing. Second, after soil collection, it needs to be transported to a designated location, leading to a long collection cycle and low efficiency. Third, the stability and integration of the equipment need further optimization.

[0004] Therefore, there is an urgent need for a sampling device for the remediation of polycyclic aromatic hydrocarbon-contaminated soil that can integrate sampling, in-situ encapsulation, and self-cleaning, while maximizing the integrity of the sample and avoiding cross-contamination. Summary of the Invention

[0005] To overcome the above-mentioned technical problems, the present invention provides a sampling device for the remediation of polycyclic aromatic hydrocarbon contaminated soil.

[0006] The present invention adopts the following technical solution: a sampling device for the remediation of polycyclic aromatic hydrocarbon contaminated soil, including a rotatable sampling head and a controller, an openable and closable receiving container connected to the output end of the sampling head, an automatic sealing mechanism slidably connected to the side wall of the output end of the sampling head, the automatic sealing mechanism including a switching drive component and a sealing drive component, and a cleaning mechanism connected to the input end of the receiving container.

[0007] Preferably, the sampling head is also provided with a drive mechanism to rotate it.

[0008] Preferably, the drive mechanism includes a connecting rod fixed to the sampling head, a turntable fixedly connected to the other end of the connecting rod above the sampling head, an output shaft of a first drive motor fixedly connected to the other end of the turntable, a mounting frame fixedly connected to the first drive motor, and a handle and a controller fixedly connected to the end of the mounting frame away from the first drive motor.

[0009] Preferably, a buffer pad is fixedly connected to the inner wall of the receiving container, the buffer pad is in contact with the container bottle, a switch for opening and closing is fixedly connected to the outer wall of the receiving container, the container bottle is made of opaque glass, and a first pressure sensor is provided on the buffer pad.

[0010] Preferably, the switching drive assembly includes a base ring that is rotatably embedded in the output end of the sampling head. The inner wall of the base ring is connected to a transmission rod via an electromagnetic clutch. One end of the transmission rod is fixedly connected to the output shaft of a second drive motor above the base ring. The second drive motor is fixedly connected to the outer plate of the sampling head. The base ring is also provided with a through hole that connects the sampling head and the housing. An encapsulation assembly and a displacement sensor are fixedly connected to the side wall of the transmission rod in sequence.

[0011] Preferably, the encapsulation component includes a lifting plate built into the base ring. The lower end of the lifting plate is hinged to the base ring via a scissor bracket. The scissor bracket and the transmission rod are connected inside the base ring via a gear transmission mechanism. A second pressure sensor is provided on the lifting plate. The base ring has a groove for the lifting plate to move up and down and for the gear transmission mechanism to move.

[0012] Preferably, the gear transmission mechanism includes a drive bevel gear coaxially fixedly connected to the transmission rod, a transmission bevel gear meshing with one side of the drive bevel gear, the transmission bevel gear being connected to the lead screw via a rotating shaft, a drive block being threadedly connected to the outer surface of the lead screw, and the drive block being hinged to the support leg of the scissor bracket.

[0013] Preferably, the cleaning mechanism includes a sliding sleeve receiving container with a movable ring. A water spray head and a drying head are fixedly connected to the side wall of the movable ring. The water spray head and the drying head are respectively connected to a water pump and a dryer fixed to the turntable through pipes. The water pump input end is connected to a water storage tank fixed to the turntable. The receiving container input end has a through hole that connects the water spray head and the drying head.

[0014] Preferably, the sampling head and the base ring are made of stainless steel, and the sampling end of the sampling head is provided with several cutting blocks.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes a rotatable sampling head, an automatic sealing mechanism, and a cleaning mechanism to achieve the collection, storage, packaging, and cleaning of PAHs soil, ensuring the airtightness of the soil collection process, avoiding cross-contamination, improving the accuracy and reliability of test data, and protecting the health of staff.

[0016] 2. This invention prevents the volatilization and photodegradation of PAHs in soil by using an opaque glass container and a stainless steel sampling head and base ring. Furthermore, displacement and pressure sensors ensure sampling safety and stability.

[0017] 3. The present invention reduces labor time, improves the response efficiency of each component of the sampling equipment, makes it convenient to use, and enhances the cooperation effect of each component by electrically connecting the controller with the first drive motor, the second drive motor, the electromagnetic clutch, the displacement sensor, the first pressure sensor, the second pressure sensor, the air pump, and the dryer. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an overall schematic diagram of the invention; Figure 2 This is an overall cross-sectional view of the invention; Figure 3 This is a schematic diagram of the sampling head of the present invention; Figure 4 This is a cross-sectional view of the automatic sealing mechanism and receiving container of the present invention; Figure 5 This is a schematic diagram of the internal structure of the automatic sealing mechanism of the present invention; Figure 6 This is a schematic diagram of the encapsulated driver component of the present invention; Figure 7 This is a schematic diagram of the cleaning mechanism of the present invention.

[0020] The components are as follows: 1. Sampling head; 2. Controller; 3. Cutting block; 4. Base ring; 5. Connecting rod; 6. Transmission rod; 7. Second drive motor; 8. Outer plate; 9. Drive bevel gear; 10. Transmission bevel gear; 11. Rotating shaft; 12. Lead screw; 13. Electromagnetic clutch; 14. Displacement sensor; 15. Scissor bracket; 16. Lifting plate; 17. Second pressure sensor; 18. First pressure sensor; 19. Drive block; 20. Receiving container; 21. Buffer pad; 22. Container bottle; 23. Switch; 24. Moving ring; 25. Spray head; 26. Drying head; 27. Pipeline; 28. Water pump; 29. ​​Dryer; 30. Water tank; 31. Turntable; 32. First drive motor; 33. Mounting frame; 34. Handle; 35. Sealing cap. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. Throughout the specific implementation, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Unless otherwise specified, the raw materials and equipment used are commercially available or commonly used in the art. The methods in the embodiments, unless otherwise specified, are conventional methods in the art. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] like Figures 1-7As shown, a sampling device for treating polycyclic aromatic hydrocarbon (PAH) contaminated soil includes a rotatable sampling head 1 and a controller 2. The output end of the sampling head 1 is connected to an openable and closable receiving container 20. A buffer pad 21 is fixedly connected to the inner wall of the receiving container 20, and the buffer pad 21 is in contact with a container bottle 22. A switch 23 is fixedly connected to the outer wall of the receiving container 20 to open and close it. The container bottle 22 is made of opaque glass. A first pressure sensor 18 is provided on the buffer pad 21. The receiving container 20 is placed into and fixed by the switch 23 to ensure that the PAH contaminated soil is always kept in a state of being unexposed to light. An automatic sealing mechanism is slidably connected to the side wall of the output end of the sampling head 1. The automatic sealing mechanism includes a switching drive component and a sealing drive component. A cleaning mechanism is connected to the input end of the receiving container 20. The sampling head 1 is also equipped with a drive mechanism for rotating it. The drive mechanism includes a connecting rod 5 fixed to the sampling head 1. The other end of the connecting rod 5 is fixedly connected to a turntable 31 above the sampling head 1. The other end of the turntable 31 is fixedly connected to the output shaft of a first drive motor 32. The first drive motor 32 is fixedly connected to a mounting frame 33. A handle 34 and a controller 2 are fixedly connected to the end of the mounting frame 33 away from the first drive motor 32. The turntable 31 and the mounting frame 33 are connected by a deep groove ball bearing. The switching drive assembly includes a base ring 4 that is rotatably embedded in the output end of the sampling head 1. The inner wall of the base ring 4 is connected to a transmission rod 6 through an electromagnetic clutch 13. One end of the transmission rod 6 is fixedly connected to the output shaft of a second drive motor 7 above the base ring 4. The second drive motor 7 is fixedly connected to the outer plate 8 of the sampling head 1. The base ring 4 also has a through hole connecting the sampling head 1 and the receiving container 20. The transmission rod 6 is coaxially fixedly connected to the drive mechanism. The driving bevel gear 9 is connected to the transmission bevel gear 10 on one side. The transmission bevel gear 10 is connected to the lead screw 12 via the rotating shaft 11. A drive block 19 is threaded onto the outer surface of the lead screw 12. The drive block 19 is hinged to the support leg of the scissor bracket 15. The upper end of the scissor bracket 15 is hinged to the lifting plate 16. The other support leg of the scissor bracket 15 is connected to the base ring 4. The lifting plate 16 holds the sealing cap 35. The lifting plate 16 is equipped with a second pressure sensor 17 for sensing the sealing force to ensure the stability of the sealing of the container bottle 22. The transmission rod 6 is also equipped with a displacement sensor 14 to improve the sealing accuracy of the lifting plate 16 and ensure the precise switching between the drive of the base ring 4 and the drive of the lifting plate 16. The base ring 4 has grooves for the lifting plate 16 to move up and down and for the gear transmission mechanism to move, thereby sealing the sampled container bottle 22 and reducing the occurrence of polycyclic aromatic hydrocarbon volatilization in the soil.In addition, the sampling head 1 and the base ring 4 are made of stainless steel. The sampling end of the sampling head 1 is equipped with several cutting blocks 3 to improve the accuracy of polycyclic aromatic hydrocarbon (PAH) contaminated soil detection and avoid the high lipophilicity of PAH contaminated soil. The cleaning mechanism includes a sliding sleeve receiving container 20 with a moving ring 24. The side wall of the moving ring 24 is fixedly connected to a water spray head 25 and a drying head 26. The water spray head 25 and the drying head 26 are respectively connected to a water pump 28 and a dryer 29 fixed to the turntable 31 through pipes 27. The input end of the water pump 28 is fixedly connected to a water storage tank 30 fixed to the turntable 31. The input end of the receiving container 20 is provided with a connecting spray head. The through holes of the water head 25 and the drying head 26, the moving ring 24 and the input end of the receiving container 20 are connected by a ball joint to switch between sealing and cleaning of the pipe 27. In use, the controller 2 is electrically connected to the first drive motor 32, the second drive motor 7, the electromagnetic clutch 13, the displacement sensor 14, the first pressure sensor 18, the second pressure sensor 17, the air pump and the dryer 29 to realize the sampling of polycyclic aromatic hydrocarbon contaminated soil, so as to coordinate various modes, improve sampling efficiency, enhance sampling effect, further ensure the stability and accuracy of polycyclic aromatic hydrocarbon contaminated soil sampling, and improve sampling efficiency.

[0023] To improve the efficiency and safety of the sampling device for polycyclic aromatic hydrocarbon (PAH) contaminated soil remediation, the sampling head 1 and the base ring 4 are made of stainless steel to ensure the accuracy of PAH contaminated soil detection. Several cutting blocks 3 are also provided on the sampling end of the sampling head 1 to improve sampling efficiency. Furthermore, the inclusion of a first pressure sensor 18, a second pressure sensor 17, and a displacement sensor 14 further enhances the operational stability and safety of the sampling equipment.

[0024] A sampling device for the remediation of polycyclic aromatic hydrocarbon-contaminated soil, when in use: The meshing and fixing connections are the same as usual and will not be described again. Before sampling polycyclic aromatic hydrocarbon contaminated soil, first, manually control the opening and closing of the receiving container 20 through switch 23. After opening the receiving container 20, invert it and put it into the container bottle 22. Close the receiving container 20 and lock it to realize the placement of the container bottle 22. Check that the moving ring 24 equipped with the water spray head 25 and the drying head 26 is not connected to the input end of the receiving container 20. Then, the controller 2 drives the first drive motor 32 to rotate, and the first drive motor 32 makes the turntable 31 rotate on the mounting frame 33. The turntable 31 rotates the sampling head 1 through the connecting rod 5. The handle 34 is manually pressed, and the handle 34 and the cutting block 3 work together to achieve smooth sampling of polycyclic aromatic hydrocarbon contaminated soil. Under pressure, the polycyclic aromatic hydrocarbon contaminated soil enters the container bottle 22 in the receiving container 20 along the sampling head 1. As the soil fills the container bottle 22, the sampling container bottle 22 continues to move within a small range. The first pressure sensor 18 set on the buffer pad 21 transmits the pressure data to the controller 2. When the specified standard is reached, the controller 2 controls the electromagnetic clutch 13 to be in the engaged state. The controller 2 then drives the transmission rod 6 to rotate through the second drive motor 7. The transmission rod 6 drives the base ring 4 to rotate. The displacement sensor 14 provides real-time feedback of the rotation angle. When the specified standard is reached, the lifting plate 16 placed on the sealing cover 35 moves to the corresponding position at the input end of the container bottle 22. During the rotation of the base ring 4, the base ring 4 always seals the polycyclic aromatic hydrocarbon contaminated soil in the container bottle 22. Secondly, after the controller 2 controls the electromagnetic clutch 13 to be in an unengaged state, the controller 2 causes the transmission rod 6 to rotate through the second drive motor 7, and the base ring 4 is in a stationary state. The transmission rod 6 causes the lead screw 12 to rotate through the gear transmission mechanism. The lead screw 12 controls the scissor bracket 15 to retract or expand through the drive block 19, and further controls the lifting plate 16 to rise and fall. During the rise of the lifting plate 16, the sealing cap 35 is driven to close onto the bottle mouth of the container bottle 22. The second pressure sensor 17 set in the lifting plate 16 provides real-time feedback of the pressing pressure, further ensuring the airtightness of the container bottle 22. Next, the receiving container 20 is opened by switch 23, the sampled and packaged container bottle 22 is taken out, the receiving container 20 is closed, and the controller 2 controls the electromagnetic clutch 13 to be engaged. The controller 2 drives the base ring 4 to rotate through the second drive motor 7 and the transmission rod 6. The displacement sensor 14 provides real-time feedback of the rotation angle. When the specified standard is reached, that is, the sampling head 1 and the receiving container 20 are in a connected state, and the moving ring 24 is moved to realize that the water spray head 25 is in a connected state with the input end of the receiving container 20, and the drying head 26 is in a disconnected state with the input end of the receiving container 20. The controller 2 pumps the water in the water storage tank 30 through the water pump 28 along the pipe 27 and the moving ring 24 into the through hole of the input end of the receiving container 20. The water then flows into and flushes the through hole of the base ring 4 and the internal channel of the sampling head 1.After rinsing, the moving ring 24 is moved so that the water spray head 25 is not connected to the input end of the receiving container 20, while the drying head 26 is connected to the input end of the receiving container 20. The controller 2 turns on the dryer 29, and the hot air from the dryer 29 is delivered through the pipe 27 to the inner wall of the through hole of the sampling head 1 and the base ring 4 to dry and disinfect them, thereby improving sampling efficiency, preventing soil cross-contamination, improving detection accuracy, and reducing sampling time.

[0025] After use, a sampling device for the remediation of polycyclic aromatic hydrocarbon contaminated soil is restored to its initial state via controller 2, ready for use in the next contaminated soil test.

[0026] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to the above embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A sampling device for remediation of polycyclic aromatic hydrocarbon (PAH) contaminated soil, comprising a rotatable sampling head and a controller, characterized in that, The sampling head output end is connected to an openable receiving container, and an automatic sealing mechanism is slidably connected to the side wall of the sampling head output end. The automatic sealing mechanism includes a switching drive component and a sealing drive component. A cleaning mechanism is connected to the input end of the receiving container.

2. The sampling device for remediation of polycyclic aromatic hydrocarbon contaminated soil according to claim 1, characterized in that, The sampling head is also equipped with a drive mechanism to rotate it.

3. The sampling device for remediation of polycyclic aromatic hydrocarbon contaminated soil according to claim 2, characterized in that, The drive mechanism includes a connecting rod fixed to the sampling head, a turntable fixedly connected to the other end of the connecting rod above the sampling head, an output shaft of a first drive motor fixedly connected to the other end of the turntable, a mounting frame fixedly connected to the first drive motor, and a handle and a controller fixedly connected to the end of the mounting frame away from the first drive motor.

4. The sampling device for remediation of polycyclic aromatic hydrocarbon contaminated soil according to claim 1, characterized in that, A buffer pad is fixedly connected to the inner wall of the receiving container, and the buffer pad is in contact with the container bottle. A switch that opens and closes is fixedly connected to the outer wall of the receiving container. The container bottle is made of opaque glass, and a first pressure sensor is installed on the buffer pad.

5. The sampling device for remediation of polycyclic aromatic hydrocarbon contaminated soil according to claim 1, characterized in that, The switching drive assembly includes a base ring that is rotated and embedded in the output end of the sampling head. The inner wall of the base ring is connected to a transmission rod via an electromagnetic clutch. One end of the transmission rod is fixedly connected to the output shaft of a second drive motor above the base ring. The second drive motor is fixedly connected to the outer plate of the sampling head. The base ring also has a through hole that connects the sampling head and the housing. An encapsulation assembly and a displacement sensor are fixedly connected to the side wall of the transmission rod in sequence.

6. The sampling device for remediation of polycyclic aromatic hydrocarbon contaminated soil according to claim 5, characterized in that, The encapsulation component includes a lifting plate built into the base ring. The lower end of the lifting plate is hinged to the base ring via a scissor bracket. The scissor bracket and the transmission rod are connected inside the base ring via a gear transmission mechanism. A second pressure sensor is provided on the lifting plate. The base ring has a groove for the lifting plate to move up and down and for the gear transmission mechanism to move.

7. A sampling device for remediation of polycyclic aromatic hydrocarbon contaminated soil according to claim 6, characterized in that, The gear transmission mechanism includes a drive bevel gear that is coaxially fixedly connected to the transmission rod, a transmission bevel gear that meshes with one side of the drive bevel gear, a lead screw that is connected to the lead screw via a rotating shaft, a drive block that is threaded onto the outer surface of the lead screw, and the drive block that is hinged to the support leg of the scissor bracket.

8. The sampling device for remediation of polycyclic aromatic hydrocarbon contaminated soil according to claim 4, characterized in that, The cleaning mechanism includes a sliding sleeve receiving container with a moving ring. A water spray head and a drying head are fixedly connected to the side wall of the moving ring. The water spray head and the drying head are respectively connected to a water pump and a dryer fixed to a turntable through pipes. The water pump input end is connected to a water storage tank fixed to the turntable. The receiving container input end has a through hole that connects the water spray head and the drying head.

9. A sampling device for remediation of polycyclic aromatic hydrocarbon contaminated soil according to claim 5, characterized in that, The sampling head and base ring are made of stainless steel, and the sampling end of the sampling head is equipped with several cutting blocks.

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