Sampler for environment-friendly monitoring of soil pollution

Abstract

The invention discloses a sampler for environment-friendly monitoring of soil pollution, and relates to the technical field of soil monitoring and sampling. Comprising a connecting base, the connecting base is in threaded connection with an outer sleeve, the lower side of the outer sleeve is in threaded connection with a drill bit, the lower side of the connecting base is rotationally connected with a mounting base, the lower side of the mounting base is in threaded connection with a middle sleeve and an inner cylinder, the outer side of the inner cylinder is sleeved with a wrapping cylinder, the lower side of the mounting base is detachably connected with a U-shaped frame, and the connecting base is in spline connection with a screwing shaft; a plurality of pull ropes are connected to the screwing shaft in a clamped mode and fixedly connected with the lower side of the wrapping cylinder. By means of friction force between the wrapping cylinder and the soil sample, the soil sample is actively pulled to move in the inner cylinder, so that the soil sample can continuously move to a deeper part without waiting for extrusion of a new sample section in the process of passing through the cavity, mutual contact of two sample sections is avoided, and an original soil hierarchical structure is kept; the step of re-site selection and sampling is omitted, and the sampling efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of soil monitoring and sampling technology, and in particular to a sampler for environmental monitoring of soil pollution. Background Technology

[0002] Soil pollution monitoring is an activity that assesses environmental quality by analyzing the content of pollutants in soil. Its core objective is to determine the soil background value and achieve dynamic monitoring, prediction, and control of soil environmental quality. Currently, triple-tube samplers are commonly used to periodically sample soil at specific locations and depths. During drilling, the equipment relies on an external drill pipe to cut through the soil layers and gradually squeeze the soil sample into the inner tube for storage. However, due to geological changes, hydrological erosion, or human activities, cavities are easily present in the soil of the sampling area. When the sampler passes through a cavity, the sample in the inner tube, losing the support and compression of the soil below, remains relatively stationary with the sampler. After the sampler passes through the cavity, the newly entered sample segment comes into contact with the original sample segment, and then pushes the sample to a deeper part. This process causes two sample segments from different depths to come into contact with each other, destroying the original soil layer structure and causing sample mixing. Such mixing not only causes cross-contamination of soil layers at different depths but also blurs the sequence information, causing the loss of effective depth markers, and ultimately seriously affecting the accuracy of pollutant distribution analysis. If such a situation occurs, it is often necessary to re-select a sampling site, significantly increasing the difficulty of the work and reducing sampling efficiency. Summary of the Invention

[0003] This invention provides a sampler for environmental monitoring of soil pollution, which overcomes the shortcomings of existing sampling processes that lead to a lack of spatial representativeness of the sample when encountering soil with cavities, requiring resampling and resulting in low sampling efficiency.

[0004] The technical solution is as follows: A sampler for environmental monitoring of soil pollution includes: a connecting seat, an outer sleeve threadedly connected to the connecting seat, a drill bit threadedly connected to the lower side of the outer sleeve, a mounting seat rotatably connected to the lower side of the connecting seat, a middle sleeve and an inner cylinder threadedly connected to the lower side of the mounting seat, the mounting seat, the middle sleeve and the inner cylinder are all located inside the outer sleeve, a cutter threadedly connected to the lower side of the middle sleeve, a wrapping tube sleeved on the outer side of the inner cylinder, a U-shaped frame detachably connected to the lower side of the mounting seat located inside the inner cylinder, a tightening shaft splinedly connected to the connecting seat, a plurality of pull ropes being engaged with the tightening shaft, and the plurality of pull ropes all passing around the U-shaped frame and fixedly connected to the lower side of the wrapping tube.

[0005] Furthermore, the tightening shaft consists of two parts, upper and lower, with the diameter of the upper part being larger than the diameter of the lower part.

[0006] Furthermore, the U-shaped bracket is threadedly connected to the lower half of the tightening shaft.

[0007] Furthermore, the wrapping tube is made of an elastic material, and the outer side of the wrapping tube is provided with a ring of uniformly distributed reinforcing threads, which are used to limit the tensile deformation of the wrapping tube in the axial direction.

[0008] Furthermore, the inner diameter of the inner cylinder is larger than the minimum inner diameter of the cutter, and the inner diameter of the wrapping tube in its free state is smaller than the minimum inner diameter of the cutter.

[0009] Furthermore, the outer side of the packaging tube is provided with evenly distributed burrs to increase the friction between the packaging tube and the soil sample.

[0010] Furthermore, a guide portion is provided on the lower side of the inner cylinder, which is used to guide the deformation of the wrapping cylinder and reduce the friction between it and the bending point of the wrapping cylinder.

[0011] Furthermore, a guide tube is fixedly connected inside the cutter, and the inner diameter of the guide tube is equal to the inner diameter of the inner tube.

[0012] Furthermore, a compression ring is fixed to the upper side of the packaging tube, and both the guide tube and the compression ring are made of elastic material.

[0013] Furthermore, the cutter is fixedly connected with a ring of evenly distributed oscillating inserts, which are in contact with the outer side of the guide cylinder. The oscillating inserts are made of elastic metal, and the compression ring is used to compress the oscillating inserts and make them oscillate.

[0014] The present invention discloses the following technical effects: The present invention relies on the relative rotation of the connecting seat and the mounting seat to drive the pull rope to gradually wrap around the tightening shaft, so that the wrapping tube moves into the inner tube and wraps the soil sample entering the inner tube. With the help of the friction between the wrapping tube and the soil sample, the soil sample is actively pulled to move in the inner tube. In this way, when passing through the cavity, it can continue to move to a deeper part without waiting for the compression of the new sample segment, avoiding the mutual contact of the two sample segments, maintaining the original soil layer structure, eliminating the step of re-sampling, and improving sampling efficiency.

[0015] By relying on the threaded connection between the U-shaped frame and the tightening shaft, the position of the pull rope winding around the surface of the tightening shaft continuously changes, thus ensuring that the speed at which the pull rope pulls the wrapping cylinder remains stable and avoiding the relative movement of the wrapping cylinder and the inner cylinder from affecting the soil's stratification.

[0016] The oscillating insert is squeezed by the squeezing ring, causing it to oscillate and embed into the circumference of the soil sample after sampling. This enhances the driving force of the inner cylinder on the circumferential rotation of the sample. After sampling, the connecting seat directly drives the mounting seat to rotate by the cooperation of the tightening shaft and the U-shaped frame. The oscillating insert then drives the sample to rotate together, breaking the sample off at its root, thus facilitating sample removal. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the connector and mounting base of the present invention; Figure 3 This is a three-dimensional structural cross-sectional view of the outer sleeve and the middle sleeve of the present invention; Figure 4 This is a three-dimensional structural cross-sectional view of the mounting base and the middle sleeve of the present invention; Figure 5 This is a three-dimensional structural cross-sectional view of the inner cylinder and the outer sleeve of the present invention; Figure 6 This is a three-dimensional structural diagram of the U-shaped frame and tightening shaft of the present invention; Figure 7 Appendix to this invention Figure 5 Enlarged view of point A in the middle.

[0018] Explanation of reference numerals in the attached drawings: 1-Connecting seat, 2-Outer sleeve, 3-Drill bit, 4-Mounting seat, 5-Middle sleeve, 6-Cutter, 7-Inner sleeve, 701-Guide part, 8-Wrapping sleeve, 9-U-shaped frame, 10-Tightening shaft, 11-Pull rope, 12-Reinforcing wire, 13-Guide sleeve, 14-Extrusion ring, 15-Swing insert. Detailed Implementation

[0019] To make the above features and advantages of the present invention more readily understood, specific embodiments are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0020] It should be noted that the initial state in this article refers to the state shown in the attached figures.

[0021] Example 1 This embodiment provides a sampler for environmental monitoring of soil pollution, in order to solve the problem that existing samplers will damage the soil layer structure when sampling soil with cavities.

[0022] See Figures 1 to 6A soil pollution environmental monitoring sampler includes: a connecting seat 1, an outer sleeve 2 threadedly connected to the connecting seat 1, a drill bit 3 threadedly connected to the lower side of the outer sleeve 2, a mounting seat 4 rotatably connected to the lower side of the connecting seat 1, a middle sleeve 5 and an inner cylinder 7 threadedly connected to the lower side of the mounting seat 4, the mounting seat 4, the middle sleeve 5 and the inner cylinder 7 are all located inside the outer sleeve 2, and a cutter 6 threadedly connected to the lower side of the middle sleeve 5. The connecting seat 1, the outer sleeve 2, the drill bit 3, the mounting seat 4, the middle sleeve 5, the cutter 6 and the inner cylinder 7 together form the existing triple tube sampler, which is the existing structure and will not be described in detail here. An outer sleeve 8 is fitted around the inner cylinder 7. Initially, the sleeve 8 is a cylindrical tube with an open top and a bottom. A U-shaped frame 9 located inside the inner cylinder 7 is detachably connected to the lower side of the mounting base 4 by bolts. A tightening shaft 10 is splined to the connecting base 1. Two pull ropes 11 are symmetrically distributed in the center of the tightening shaft 10. The U-shaped frame 9 is provided with grooves for limiting the pull ropes 11 to keep the position of the bending point of the pull ropes 11 unchanged. Both pull ropes 11 pass around the U-shaped frame 9 and are fixed to the lower side of the sleeve 8. The pull ropes 11 can be fixed to the lower side of the sleeve 8 by knotting.

[0023] The above setup enables the relative rotation of the connecting seat 1 and the mounting seat 4 to drive the pull rope 11 to gradually wrap around the tightening shaft 10, causing the wrapping tube 8 to move into the inner tube 7 and wrap the soil sample entering the inner tube 7. With the help of the friction between the wrapping tube 8 and the soil sample, the soil sample is actively pulled to move in the inner tube 7. In this way, when passing through the cavity, it can continue to move to a deeper part without waiting for the compression of the new sample segment, avoiding the mutual contact of the two sample segments, maintaining the original soil layer structure, eliminating the step of re-sampling, and improving sampling efficiency.

[0024] See Figure 7 The tightening shaft 10 consists of two parts, upper and lower, with the diameter of the upper part being larger than that of the lower part, so that the pull rope 11 can be wound around the lower part of the tightening shaft 10 without affecting the up-and-down movement of the tightening shaft 10; the U-shaped frame 9 is threadedly connected to the lower part of the tightening shaft 10.

[0025] The above setup enables the position of the pull rope 11 winding around the surface of the tightening shaft 10 to continuously change by relying on the threaded connection between the U-shaped frame 9 and the tightening shaft 10. This ensures that the speed at which the pull rope 11 pulls the wrapping cylinder 8 remains stable, and avoids the relative movement of the wrapping cylinder 8 and the inner cylinder 7 from affecting the soil's layered structure.

[0026] See Figure 3The wrapping tube 8 is made of an elastic material, specifically polyurethane. Initially, the wrapping tube 8 is in a state of elastic tensile deformation. The outer side of the wrapping tube 8 is provided with a ring of uniformly distributed reinforcing filaments 12. The reinforcing filaments 12 are used to limit the tensile deformation of the wrapping tube 8 in the axial direction. This allows the wrapping tube 8 to undergo elastic tensile deformation only in the radial direction, reducing the impact of the elastic deformation of the wrapping tube 8 in the axial direction on the density of the sample.

[0027] See Figure 5 The inner diameter of the inner cylinder 7 is greater than the minimum inner diameter of the cutter 6, and the inner diameter of the wrapping tube 8 in its free state is less than the minimum inner diameter of the cutter 6; this allows the wrapping tube 8 to exert radial pressure on the sample under its own elastic force, thereby maintaining the shape of the sample and reducing the friction force experienced by the wrapping tube 8 during its movement within the inner cylinder 7, thus improving the reliability of the wrapping tube 8 in moving the sample upward relative to the inner cylinder 7.

[0028] Sampling process: Select a site and determine the sampling depth. Use a drilling rig to drill a hole at the designated location so that the device can be moved directly to the sampling depth. Then install the device onto the drilling rig and use the drilling rig to insert the device into the drilled hole and move it to the sampling depth. During the downward movement, select the rotation speed and feed speed of the connecting seat 1 according to the pitch of the thread on the surface of the tightening shaft 10 and the diameter of the lower part of the tightening shaft 10. The drilling rig controls the rotation of the connecting seat 1. The connecting seat 1 drives the outer sleeve 2, the drill bit 3 and the mounting seat 4 to rotate together (since the cutter 6 is not subjected to external force in this state, the mounting seat 4 will rotate with the connecting seat 1).

[0029] After moving to the sampling depth, the cutter 6 comes into contact with the soil and stops rotating due to the friction force from the soil, causing the mounting base 4, the middle sleeve 5, and the inner cylinder 7 to stop rotating (the connecting base 1 remains in a state of uniform downward movement). In this state, the mounting base 4 and the connecting base 1 rotate relative to each other. The connecting base 1 drives the tightening shaft 10 to rotate through the spline. The tightening shaft 10 winds the pull rope 11 onto it, so that the pull rope 11 pulls the middle part of the wrapping cylinder 8 to move upward relative to the inner cylinder 7 while remaining stationary relative to the soil layer.

[0030] During the rotation of the tightening shaft 10 relative to the U-shaped frame 9, the tightening shaft 10 moves upward relative to the U-shaped frame 9 under the action of the thread on the U-shaped frame 9, causing the position of the pull rope 11 winding on the surface of the tightening shaft 10 to continuously change, preventing the pull rope 11 from accumulating on the surface of the tightening shaft 10 and causing the speed at which the pull rope 11 is wound to change, thereby causing the wrapping cylinder 8 to move upward relative to the inner cylinder 7 at a uniform speed, and the speed at which the wrapping cylinder 8 moves upward relative to the inner cylinder 7 is equal to the speed at which the inner cylinder 7 moves downward.

[0031] As the connecting seat 1 drives the cutter 6 to move downward, the cutter 6 cuts the soil and forms a columnar sample. As the cutter 6 moves downward, the sample length gradually increases (during this process, the upper side of the sample and the middle of the wrapping tube 8 remain relatively stationary). As the inner tube 7 moves downward, the inner tube 7 gradually wraps the wrapping tube 8 onto the sample surface, relying on the elasticity of the wrapping tube 8 to wrap the sample and provide radial extrusion force to the sample.

[0032] When encountering a cavity, the sample inside the inner cylinder 7 remains stationary under the action of the wrapping tube 8, meaning the horizontal depth of the sample inside the inner cylinder 7 remains unchanged. The sample moves at a constant speed to a deeper part of the inner cylinder 7 under the influence of the wrapping tube 8. After passing through the cavity, a new sample segment enters the inner cylinder 7 and is wrapped by the wrapping tube 8. The friction between the wrapping tube 8 and the sample keeps the distance between the two sample segments constant, thus ensuring that the soil layer structure remains unchanged. When the wrapping tube 8 contacts the U-shaped frame 9, the inner cylinder 7 can no longer hold soil samples. At this point, the sampling work is completed, and the sample connected to the device is removed using a drilling rig.

[0033] After removing the device to the ground, remove the outer sleeve 2 from the connecting seat 1, and remove the middle sleeve 5 and inner sleeve 7 from the mounting seat 4 in sequence. Then, disconnect the pull rope 11 from the middle of the wrapping tube 8, and remove the wrapping tube 8 containing the sample and test the various properties of the sample. Rotate the mounting seat 4 in the opposite direction relative to the connecting seat 1 to drive the tightening shaft 10 to reset relative to the U-shaped frame 9. Then, put the new wrapping tube 8 on the outside of the inner sleeve 7, and fix the inner sleeve 7 and the middle sleeve 5 in the corresponding positions on the mounting seat 4 in sequence. Connect the pull rope 11 to the new wrapping tube 8 and keep the pull rope 11 taut. Then, fix the outer sleeve 2 in the corresponding position on the connecting seat 1. The sampling and monitoring work at a single location is now complete.

[0034] Example 2 This embodiment is a further optimization based on embodiment 1, in order to improve the stability of the soil sample wrapped by the wrapping tube 8.

[0035] See Figure 3 The outer side of the packaging tube 8 is provided with evenly distributed burrs. The burrs are small round rods made of polyethylene material, which are not shown in detail in the attached figure. On the one hand, the burrs squeeze the sample to make the sample surface rougher and increase the friction between the sample and the packaging tube 8. On the other hand, the burrs provide support for the two sample segments, maintain the distance between the two sample segments, and improve the reliability of the packaging tube 8 in wrapping the sample segments.

[0036] Example 3 This embodiment is a further optimization based on embodiment 2.

[0037] See Figure 5 and Figure 7The lower side of the inner cylinder 7 is provided with a guide part 701. The cross-section of the guide part 701 is arc-shaped. The guide part 701 is used to guide the deformation of the wrapping cylinder 8 and reduce the friction between it and the bending point of the wrapping cylinder 8.

[0038] Example 4 This embodiment is a further optimization based on embodiment 3.

[0039] See Figures 3 to 5 and Figure 7 A guide tube 13 is fixed inside the cutter 6. The inner diameter of the guide tube 13 is equal to the inner diameter of the inner tube 7. The guide tube 13 is used to prevent soil samples from entering between the cutter 6 and the inner tube 7. A compression ring 14 is fixed to the upper side of the wrapping tube 8. Both the guide tube 13 and the compression ring 14 are made of elastic polyurethane. A ring-shaped, evenly distributed swing insert 15 is fixed inside the cutter 6. The swing insert 15 is made of elastic metal. The swing insert 15 fits against the outer side of the guide tube 13. The compression ring 14 is used to compress the swing insert 15 and make it swing. When the tightening shaft 10 moves to the limit position, the upper side of the tightening shaft 10 fits against the connecting seat 1, and the lower side of the tightening shaft 10 is coplanar with the lower side of the U-shaped frame 9.

[0040] The above setup enables the squeezing ring 14 to squeeze the swinging insert 15, causing the swinging insert 15 to swing and embed into the periphery of the soil sample after sampling, thereby enhancing the driving force of the inner cylinder 7 on the circumferential rotation of the sample. After sampling, the connecting seat 1 directly drives the mounting seat 4 to rotate by the cooperation of the tightening shaft 10 and the U-shaped frame 9, and then the swinging insert 15 drives the sample to rotate together, twisting the sample off from its root, thus making it easy to remove the sample.

[0041] Procedure: Repeat the steps of Example 1. The middle part of the wrapping tube 8 moves upward relative to the inner tube 7. The wrapping tube 8 drives the squeezing ring 14 to move downward relative to the inner tube 7. When the sampling is about to end, the squeezing ring 14 moves out from between the inner tube 7 and the middle sleeve 5. During the process of moving out, it squeezes the swinging plug 15, causing the swinging plug 15 to swing and drive the guide tube 13 to deform. The swinging plug 15 and the guide tube 13 are embedded into the sample together. Until the sampling ends, when the tightening shaft 10 can no longer move relative to the connecting seat 1, the lower side of the tightening shaft 10 is coplanar with the lower side of the U-shaped frame 9, and the upper side of the middle part of the wrapping tube 8 contacts the U-shaped frame 9. In this state, as the connecting seat 1 rotates, the connecting seat 1 drives the U-shaped frame 9 and the mounting seat 4 to rotate together through the tightening shaft 10. The mounting seat 4 drives the middle sleeve 5, the cutter 6 and all the swinging plugs 15 to rotate together. The swinging plug 15 provides circumferential limiting for the sample in the inner tube 7, causing the sample in the inner tube 7 to rotate together and to break off from the root. Then repeat the steps of Example 1 to take out the sample.

[0042] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sampler for environmental monitoring of soil pollution, comprising: A connecting seat (1) is threadedly connected to an outer sleeve (2), and a drill bit (3) is threadedly connected to the lower side of the outer sleeve (2). A mounting seat (4) is rotatably connected to the lower side of the connecting seat (1). A middle sleeve (5) and an inner cylinder (7) are threadedly connected to the lower side of the mounting seat (4). The mounting seat (4), the middle sleeve (5), and the inner cylinder (7) are all located inside the outer sleeve (2). A cutter (6) is threadedly connected to the lower side of the middle sleeve (5). The inner cylinder (7) is characterized in that a wrapping tube (8) is sleeved on the outer side. A U-shaped frame (9) located inside the inner cylinder (7) is detachably connected to the lower side of the mounting seat (4). A tightening shaft (10) is splinedly connected to the connecting seat (1). A plurality of pull ropes (11) are engaged with the tightening shaft (10). The plurality of pull ropes (11) all pass around the U-shaped frame (9) and are fixedly connected to the lower side of the wrapping tube (8).

2. The soil pollution environmental monitoring sampler according to claim 1, characterized in that, The tightening shaft (10) consists of two parts, upper and lower, and the diameter of the upper part of the tightening shaft (10) is larger than the diameter of the lower part.

3. A sampler for environmental monitoring of soil pollution according to claim 2, characterized in that, The U-shaped bracket (9) is threadedly connected to the lower half of the tightening shaft (10).

4. A sampler for environmental monitoring of soil pollution according to claim 1, characterized in that, The wrapping tube (8) is made of elastic material, and a ring of uniformly distributed reinforcing threads (12) is provided on the outer side of the wrapping tube (8). The reinforcing threads (12) are used to limit the tensile deformation of the wrapping tube (8) in the axial direction.

5. A sampler for environmental monitoring of soil pollution according to claim 4, characterized in that, The inner diameter of the inner cylinder (7) is greater than the minimum inner diameter of the cutter (6), and the inner diameter of the wrapping cylinder (8) in its free state is less than the minimum inner diameter of the cutter (6).

6. A sampler for environmental monitoring of soil pollution according to claim 4, characterized in that, The outer side of the wrapping tube (8) is provided with uniformly distributed burrs to increase the friction between the wrapping tube (8) and the soil sample.

7. A sampler for environmental monitoring of soil pollution according to claim 6, characterized in that, The lower side of the inner cylinder (7) is provided with a guide part (701), which is used to guide the deformation of the wrapping cylinder (8) and reduce the friction between it and the bending point of the wrapping cylinder (8).

8. A sampler for environmental monitoring of soil pollution according to claim 7, characterized in that, A guide tube (13) is fixedly connected inside the cutter (6), and the inner diameter of the guide tube (13) is equal to the inner diameter of the inner tube (7).

9. A sampler for environmental monitoring of soil pollution according to claim 8, characterized in that, A compression ring (14) is fixed to the upper side of the wrapping tube (8), and both the guide tube (13) and the compression ring (14) are made of elastic material.

10. A sampler for environmental monitoring of soil pollution according to claim 9, characterized in that, The cutter (6) has a ring of evenly distributed oscillating inserts (15) fixed inside. The oscillating inserts (15) are attached to the outer side of the guide cylinder (13). The oscillating inserts (15) are made of elastic metal. The extrusion ring (14) is used to extrude the oscillating inserts (15) and make them oscillate.

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