A groundwater multilayer monitoring well sampling tool
By designing a combined structure of support unit, sampling unit and anti-collision unit, the problems of poor sealing and cross-contamination in existing multi-layer sampling tools are solved, realizing efficient and reliable multi-layer sampling and ensuring no sample leakage and no cross-contamination.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA GEOLOGICAL SURVEY HOHHOT NATURAL RESOURCES COMPREHENSIVE SURVEY CENT
- Filing Date
- 2026-03-13
- Publication Date
- 2026-06-05
AI Technical Summary
Existing multi-layer sampling tools have problems such as insecure sealing, high risk of sample leakage, and misalignment and cross-contamination when multiple tubes are connected in series for sampling.
A sampling tool for multi-layer groundwater monitoring wells was designed, which adopts a combined structure of support unit, sampling unit and anti-collision unit. Through the design of equal included angle of the central rod protrusion and the adaptation of the sleeve gap, the independent driving of each layer of the cap is realized. Combined with the connection of the annular sealing strip and the gasket, the sealing is ensured without dead corners. The stability and locking reliability are improved by the elastic anti-collision unit and the toothed plate interlocking structure.
It achieves high precision in layered sealing, prevents cross-contamination, has strong anti-collision stability, high locking reliability, avoids sample leakage, and completes multi-layer sampling in one drop, significantly improving efficiency.
Smart Images
Figure CN122149935A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of groundwater monitoring, and in particular to a sampling tool for multi-layer groundwater monitoring wells. Background Technology
[0002] Multi-layer groundwater monitoring is a core component of hydrological environmental monitoring, and the accuracy of its sampling directly determines the reliability of the monitoring data. Existing multi-layer sampling tools are mainly divided into two categories: single-tube fractional sampling and multi-tube series sampling. Single-tube fractional sampling requires repeatedly lowering the tool to collect samples at different depths, which is inefficient, and repeated disturbance of the tool can easily lead to cross-contamination of groundwater in different layers. Although multi-tube series sampling can complete multi-layer sampling in one go, it has significant drawbacks.
[0003] Existing multi-tube sampling tools rely on simple interlocking structures for layered sealing, which can easily trigger the sealing action of non-target layers during sealing, leading to seal failure. Furthermore, the lack of targeted anti-collision design means that protrusions on the downhole well wall can cause the tool to wobble, resulting in misalignment between the sampling container and the sealing cap, further exacerbating the sealing problem. Additionally, the sealing locking mechanism is prone to loosening after sampling, posing a high risk of sample leakage. Summary of the Invention
[0004] Therefore, the technical problem to be solved by the present invention is that existing sampling tools have the risk of sample leakage due to insecure sealing during use.
[0005] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a groundwater multi-layer monitoring well sampling tool, which includes a support unit, wherein several sampling layers are arranged in the support unit, and a control lever assembly is provided in the support unit; a sampling unit is arranged in the sampling layer, which includes a sampling bucket and a cap, wherein the cap is arranged on the sampling bucket and connected to the control lever assembly; and an anti-collision unit, wherein several sets of anti-collision units are arranged outside the support unit.
[0006] In a preferred embodiment of the groundwater multi-layer monitoring well sampling tool of the present invention: the support unit includes several sets of circumferentially arranged support plates, and positioning gaps are formed between the support plates. The top of the support plate is fixed by a first unit, and a first retaining ring, a second retaining ring and an anti-collision pad are fixedly connected to one side of the outer wall of the support plate at the bottom of the first unit.
[0007] In a preferred embodiment of the groundwater multi-layer monitoring well sampling tool of the present invention: the sampling layer includes a first layer, a second layer and a third layer, the first layer is formed between the first platform and the first retaining ring, the second layer is formed between the first retaining ring and the second retaining ring, and the third layer is formed between the second retaining ring and the anti-collision pad.
[0008] In a preferred embodiment of the groundwater multi-layer monitoring well sampling tool of the present invention: the top of the first unit is connected to the second unit via a vertical beam, and a connecting cover is fixed to the top of the second unit, the connecting cover being secured by ropes; the control lever assembly includes a drive motor, a drive cylinder, and a center rod, the drive motor being fixedly connected to the middle of the second unit, the drive cylinder being rotatably connected to the middle of the first unit, the output shaft of the drive motor being fixed to the top of the drive cylinder via a reducer, and the center rod being fixedly connected to the piston rod of the drive cylinder.
[0009] In a preferred embodiment of the groundwater multi-layer monitoring well sampling tool of the present invention: the outer wall of the central rod is provided with a first protrusion, a second protrusion and a third protrusion at the same height along its axial direction, the first protrusion, the second protrusion and the third protrusion being arranged sequentially from the top to the bottom of the central rod; an included angle α is formed between the first protrusion and the second protrusion, and an included angle β is formed between the second protrusion and the third protrusion, the included angle α and the included angle β being equal.
[0010] In a preferred embodiment of the groundwater multi-layer monitoring well sampling tool of the present invention: the outer wall of the sampling bucket is provided with positioning grooves at equal intervals, and the support plate is slidably inserted into the positioning grooves; the outer wall of the sampling bucket between the positioning grooves is also provided with a fixing groove, and a sealing plate is fixed to the outer opening of the fixing groove, and a fixed gap is formed between the sealing plate and the bottom of the fixing groove; a fixing clip is slidably inserted into the middle of the sealing plate, and the fixing clip includes an adjusting slide rod, one end of the adjusting slide rod is fixed to a knob, and the other end is rotatably inserted into a first toothed plate, and a first spring is fixed between the knob and the outer wall of the sealing plate.
[0011] In a preferred embodiment of the groundwater multi-layer monitoring well sampling tool of the present invention: a sampling port is provided at the top of the sampling bucket corresponding to the fixed slide groove; an extension rod is fixedly connected to the top of the sampling bucket on both sides of the sampling port; a locking block is also fixed to the top side wall of the extension rod; a first sealing strip is fixed to the inner wall of the top of the sampling bucket corresponding to the positioning slide groove; a first gasket is fixed to the top of the first sealing strip; a second sealing strip is fixed to the inner wall of the top of the sampling bucket corresponding to the fixed slide groove; a second gasket is fixed to the top of the second sealing strip; and the first sealing strip and the second sealing strip are connected by a third gasket.
[0012] In a preferred embodiment of the groundwater multi-layer monitoring well sampling tool of the present invention: an adjustment perforation is provided in the middle of the bottom of the sampling bucket; a second spring is fixed at the top of the corresponding position of the adjustment perforation; a stabilizing sleeve is also sleeved on the outside of the second spring; the bottom end of the stabilizing sleeve is fixed to the bottom of the sampling bucket; the cover includes a central cover and several sets of side covers vertically fixed to its outer bottom edge; a plug-in sleeve is fixed in the middle of the bottom end of the central cover; the plug-in sleeve is slidably inserted into the stabilizing sleeve and fixed to the second spring; an adjustment sleeve is fixed in the middle of the top end of the central cover. The top of the adjusting sleeve has several sets of adjusting gaps, and the first protrusion, the second protrusion and the third protrusion can slide in the corresponding adjusting gaps respectively; the top of the center cover is also fixed with a connecting plate by a third spring, and a stabilizing side plate is fixed on the outer edge of the center cover corresponding to the side cover. A converter rod is symmetrically fixed on the stabilizing side plate, and a guide rod is fixedly connected to the bottom of the converter rod. The guide rod can be slidably inserted into the fixed gap, and a second toothed plate is fixed on one side of the guide rod that is in contact with the bottom of the fixed groove. The first toothed plate and the second toothed plate are engaged and fixed.
[0013] In a preferred embodiment of the groundwater multi-layer monitoring well sampling tool of the present invention: a fixed ring is rotatably sleeved on the outside of the first platform, the first retaining ring, and the second retaining ring, the fixed ring comprising symmetrically detachable and fixed half-rings; a first ring plate and a second ring plate are respectively fixed to the inner walls of the top and bottom ends of the fixed ring, the inner diameter of the second ring plate being smaller than that of the first ring plate, the first platform, the first retaining ring, and the second retaining ring being able to be placed between the first ring plate and the second ring plate; an abutment ring is fixed to the bottom end of the second ring plate, and a locking ring is fixed to the bottom end of the abutment ring, the locking block being able to slide between the second ring plate and the locking ring, the locking ring having several sets of notches, the locking block being able to pass through the notches.
[0014] In a preferred embodiment of the groundwater multi-layer monitoring well sampling tool of the present invention: the anti-collision unit includes a support arm and a roller rotatably connected to its end. The other end of the support arm is rotatably connected to the outside of the support plate. Two sets of anti-collision units are symmetrically fixed on the support plate in the same group. A fourth spring is fixed between the support arms in the two sets of anti-collision units.
[0015] The beneficial effects of this invention are as follows: Firstly, it offers high precision in layered sealing. Through the equal angle design of the central rod protrusions and the adaptive structure of the adjusting sleeve gap, each layer of the cap is driven independently, preventing accidental triggering of non-target layer actions during sealing and solving the misalignment problem in traditional multi-tube sampling. Combined with the annular sealing strip and gasket connection design, the seal has no dead angles, effectively preventing cross-contamination. Secondly, it boasts strong anti-collision stability. The circumferentially distributed elastic anti-collision units are guided by rollers against the well wall, and the fourth spring buffers the impact force, reducing tool shaking and preventing misalignment between the sampling bucket and the cap, ensuring reliable sealing. Thirdly, it offers reliable locking and leak prevention. The toothed plate engagement and spring pre-tensioning form a double locking mechanism, combined with a self-limiting structure after sealing, preventing locking loosening after sampling. The sliding groove between the sampling bucket and the support plate further enhances structural stability. Fourthly, it completes multi-layer sampling in a single deployment, eliminating the need for repeated operations and significantly improving efficiency compared to single-tube tools, comprehensively addressing the pain points of existing technologies. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A schematic diagram of the overall structure of a multi-layer groundwater monitoring well sampling tool is shown.
[0017] Figure 2 The diagram illustrates a usage scenario for a multi-layer groundwater monitoring well sampling tool.
[0018] Figure 3 The diagram shows the structural unit of the support unit for the sampling tool in the multi-layer groundwater monitoring well.
[0019] Figure 4 A diagram of the central rod structure of a groundwater multi-layer monitoring well sampling tool is shown.
[0020] Figure 5 A structural diagram of the sampling bucket of a multi-layer groundwater monitoring well sampling tool is shown.
[0021] Figure 6 A structural diagram of the fixing clips for the sampling tool in a multi-layer groundwater monitoring well is shown.
[0022] Figure 7 A diagram showing the fixed gap distribution of sampling tools in multi-layer groundwater monitoring wells is presented.
[0023] Figure 8 A diagram showing the cap structure of a multi-layer groundwater monitoring well sampling tool is provided.
[0024] Figure 9 A schematic diagram showing the connection between the center rod and the cap of the sampling tool for multi-layer groundwater monitoring wells is shown.
[0025] Figure 10A diagram of the fixed ring structure of a groundwater multi-layer monitoring well sampling tool is shown.
[0026] Figure 11 The diagram shows the anti-collision unit structure of the groundwater multi-layer monitoring well sampling tool. Detailed Implementation
[0027] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0028] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.
[0029] Reference Figures 1 to 11 A groundwater multi-layer monitoring well sampling tool is provided, which includes a support unit 100. The support unit 100 serves as an overall load-bearing frame and provides an installation and positioning foundation for the sampling components. Several sampling layers A are provided inside the support unit 100 for arranging the sampling components in layers. A control lever assembly 101 is provided in the support unit 100 as the core for power output and motion control.
[0030] The sampling unit 200 is the execution component for the sampling function. It is located in the sampling layer A and is precisely adapted to the sampling layer space. It includes a sampling bucket 201 and a cover 202. The sampling bucket 201 is used to store the collected groundwater samples. The cover 202 is used to seal and open the sampling bucket 201. The cover 202 is located on the sampling bucket 201 and is connected to the control lever assembly 101. The sealing action is achieved by driving the control lever assembly 101.
[0031] The anti-collision unit 300 provides protection for the device during downhole operations, preventing damage to core components from well wall protrusions or debris collisions. Several sets of anti-collision units 300 are provided outside the support unit 100 and are evenly distributed along the circumference of the support unit to ensure all-round protection.
[0032] Specifically, the support unit 100 includes several sets of circumferentially arranged support plates 102. The support plates 102 are made of high-strength alloy material and are uniformly arranged circumferentially to form a stable frame. A positioning gap X1 is formed between the support plates 102 to provide a basis for the subsequent installation and positioning of the sampling bucket 201. The top of the support plate 102 is fixed as a whole by the first unit 103 to improve the structural rigidity of the support unit 100. The first unit 103 fixes the bottom of the support plate 102 to one side of the outer wall with a first retaining ring 104, a second retaining ring 105 and a crash pad 106. The three are distributed at intervals along the height direction of the support plate, which not only realizes the partitioning of the sampling layer, but also provides bottom buffering through the crash pad 106.
[0033] Sampling layer A is divided into three layers according to the depth requirements of the monitoring well: layer A1, layer A2, and layer A3. If there are more layers, they can be added as appropriate. Each layer corresponds to an independent sampling unit 200 to ensure that the samples are not cross-contaminated. The first layer A1 is formed between the first unit 103 and the first retaining ring 104, the second layer A2 is formed between the first retaining ring 104 and the second retaining ring 105, and the third layer A3 is formed between the second retaining ring 105 and the anti-collision pad 106. The height of each layer matches the height of the sampling bucket 201 to ensure a compact structure after installation.
[0034] The first unit 103 is connected to the second unit 107 via a vertical beam 103a. The vertical beam 103a has a hollow structure to reduce weight while ensuring load-bearing capacity. The second unit 107 serves as the installation platform for the drive assembly. A connecting cover 107a is fixed to the top of the second unit 107. The connecting cover 107a is used for the fixed connection of ropes. Its inner wall is provided with anti-slip texture to ensure that the ropes are firmly fixed and to prevent them from falling off during the lifting process.
[0035] The control lever assembly 101 includes a drive motor 107b, a drive cylinder 103b, and a center rod 108, which together form a power transmission and execution link. The drive motor 107b is fixedly connected to the middle of the second unit 107, providing rotational power. The drive cylinder 103b is rotatably connected to the middle of the first unit 103, responsible for realizing axial push-pull actions. The output shaft of the drive motor 107b is fixed to the top of the drive cylinder 103b through a reducer 107c. The reducer 107c can convert the high-speed rotation of the motor into a low-speed, high-torque output, ensuring powerful and stable sealing action. The center rod 108 is fixedly connected to the piston rod of the drive cylinder 103b, which can synchronously realize rotation and axial movement.
[0036] Furthermore, the outer wall of the central rod 108 is provided with a first protrusion 108a, a second protrusion 108b, and a third protrusion 108c at the same height along its axial direction. The protrusions are made of wear-resistant steel to improve service life. The three protrusions correspond to the adjustment structure of the three-layer cover 202 respectively. The first protrusion 108a, the second protrusion 108b, and the third protrusion 108c are arranged sequentially from the top to the bottom of the central rod 108, corresponding one-to-one with the position of the three sampling layers.
[0037] An angle α is formed between the first protrusion 108a and the second protrusion 108b, and an angle β is formed between the second protrusion 108b and the third protrusion 108c. The angles α and β are equal and can be set to 30°, 60°, 90° or 120° depending on the number of layers. The fewer the layers, the larger the angle can be. This angle design allows each protrusion to engage with the corresponding cover 202 in sequence when the central rod rotates, avoiding interference from multiple layers and ensuring orderly layered sealing.
[0038] Furthermore, the outer wall of the sampling barrel 201 is provided with positioning grooves 201a at equal intervals. The number of positioning grooves 201a is the same as that of the support plate 102. The support plate 102 is slidably inserted into the positioning grooves 201a to form a sliding fit, which provides radial limit and lifting guidance for the sampling barrel 201 and prevents the sampling barrel 201 from swaying laterally.
[0039] The outer wall of the sampling barrel 201 between the positioning slide grooves 201a is also provided with a fixing slide groove 201b, which provides installation space for the locking structure of the cover 202. A sealing plate 201b-1 is also fixed to the outer opening of the fixing slide groove 201b. The sealing plate 201b-1 plays a protective role for the internal components of the fixing slide groove. A fixed gap X2 is formed between the sealing plate 201b-1 and the bottom of the fixing slide groove 201b, which is used to accommodate part of the structure of the fixing clip 201b-2.
[0040] A fixing clip 201b-2 is threaded into the middle of the sealing plate 201b-1, serving as an auxiliary locking mechanism between the cover 202 and the sampling container 201. The fixing clip 201b-2 includes an adjusting slide rod 201b-2a, a knob 201b-2b, and a first toothed plate 201b-2c. One end of the adjusting slide rod 201b-2a is fixed to the knob 201b-2b for easy manual adjustment, while the other end is rotatably inserted into the first toothed plate 201b-2c. Rotating the knob can push the first toothed plate to move. A first spring T1 is fixed between the knob 201b-2b and the outer wall of the sealing plate 201b-1. The first spring T1 provides a preload force to ensure a tight fit between the toothed plates and prevent loosening.
[0041] A sampling port K is provided at the top of the sampling barrel 201 corresponding to the fixed slide 201b, serving as a channel for groundwater to enter the sampling barrel 201. An extension rod 201c is fixedly connected to the top of the sampling barrel 201 on both sides of the sampling port K. A locking block 201c-1 is also fixed to the top side wall of the extension rod 201c. The locking block 201c-1 cooperates with the fixing ring 109 to achieve axial positioning of the sampling barrel 201.
[0042] A first sealing strip 201a-1 is fixed to the inner wall of the top of the sampling bucket 201 corresponding to the positioning groove 201a, and a second sealing strip 201a-2 is fixed to the inner wall of the top of the sampling bucket 201 corresponding to the fixing groove 201b. Both are made of water-resistant and corrosion-resistant nitrile rubber. A first gasket 201a-1a is fixed to the top of the first sealing strip 201a-1, and a second gasket 201a-2a is fixed to the top of the second sealing strip 201a-2. The gasket can enhance the fit of the sealing surface. The first sealing strip 201a-1 and the second sealing strip 201a-2 are connected by a third gasket 201a-3 to form a complete annular sealing structure, ensuring that there are no dead corners in the seal.
[0043] An adjustment hole 201d is provided in the middle of the bottom of the sampling bucket 201 to provide an installation channel for the plug sleeve of the cap 202. A second spring T2 is fixed at the top of the corresponding position of the adjustment hole 201d. The second spring T2 provides the reset power for the cap 202. A stabilizing sleeve 201e is also sleeved on the outside of the second spring T2. The stabilizing sleeve 201e plays a guiding and protective role for the second spring to prevent the spring from shifting under force. The bottom end of the stabilizing sleeve 201e is fixed to the bottom of the sampling bucket 201.
[0044] The cover 202 includes a central cover 202a and several sets of side covers 202b vertically fixed to its outer bottom edge. The central cover and the side covers are integrally formed to improve structural strength. A plug-in sleeve 202a-1 is fixed at the bottom center of the central cover 202a. The plug-in sleeve 202a-1 is slidably inserted into the stabilizing sleeve 201e and fixed with the second spring T2 to form an elastic connection structure. An adjusting sleeve 202a-2 is fixed at the top center of the central cover 202a. Several sets of adjusting gaps 202a-2a are opened at the top of the adjusting sleeve 202a-2. The size of the adjusting gap matches the protrusion. The first protrusion 108a, the second protrusion 108b and the third protrusion 108c can slide in the corresponding adjusting gaps 202a-2a respectively. The rotation limit and axial push of the cover 202 are realized through the cooperation of the protrusion and the adjusting gap.
[0045] The top of the center cover 202a is also fixed with a connecting plate 202a-3 by a third spring T3. The third spring T3 can maintain the open state when the cover 202 is opened and play a buffering role when pressed to avoid rigid collision damage to the parts. A stabilizing side plate 202c is fixed to the outer edge of the center cover 202a corresponding to the side cover 202b. The stabilizing side plate 202c enhances the overall rigidity of the cover 202. A symmetrical adapter rod 202c-1 is fixed on it. A guide rod 202c-2 is fixedly connected to the bottom of the adapter rod 202c-1. The guide rod 202c-2 can be slidably inserted into the fixed gap X2 to play a guiding role. A second toothed plate 202c-2a is fixed to one side of the guide rod 202c-2 that fits against the bottom of the groove 201b. The first toothed plate 201b-2c and the second toothed plate 202c-2a are engaged and fixed to achieve mechanical locking between the cover 202 and the sampling bucket 201, improving the sealing reliability.
[0046] It should be noted that the first toothed plate 201b-2c and the second toothed plate 202c-2a are oblique teeth. When the center cover 202a is lowered to seal, the oblique edge of the first toothed plate 201b-2c slides relative to the oblique edge of the second toothed plate 202c-2a, without restricting the relative displacement. When the sampling bucket 201 is completely sealed, the first toothed plate 201b-2c is just engaged in the corresponding oblique tooth of the second toothed plate 202c-2a. With the cooperation of the first sealing strip 201a-1, the second sealing strip 201a-2, and the third gasket 201a-3, the first gasket 201a-1a and the second gasket 201a-2a assist in the sealing, and the inside of the sampling bucket 201 is completely isolated from the outside, avoiding sample leakage.
[0047] The first clamp 103, the first retaining ring 104, and the second retaining ring 105 are all rotatably sleeved with a fixing ring 109. The fixing ring 109 is used to achieve axial locking of the sampling bucket 201. It includes symmetrically detachable and fixed half rings, which are connected by bolts to facilitate the installation and removal of the fixing ring 109.
[0048] The top and bottom inner walls of the fixing ring 109 are respectively fixed with a first ring plate 109a and a second ring plate 109b, and the two ring plates form an annular groove. The inner diameter of the second ring plate 109b is smaller than that of the first ring plate 109a. The first ring 103, the first retaining ring 104 and the second retaining ring 105 can all be placed between the first ring plate 109a and the second ring plate 109b to achieve axial positioning of the fixing ring and prevent it from moving up and down.
[0049] The bottom end of the second ring plate 109b is fixed with an abutment ring 109c, and the bottom end of the abutment ring 109c is fixed with a locking ring 109d. The locking block 201c-1 can slide between the second ring plate 109b and the locking ring 109d to form a ring track. Several sets of notches 109d-1 are opened in the locking ring 109d. The position of the notches corresponds to the locking block. After the locking block 201c-1 passes through the notch 109d-1 and enters the track, the axial locking of the sampling barrel 201 can be achieved by rotating the fixing ring 109.
[0050] The anti-collision unit 300 includes a support arm 301 and a roller 302 rotatably connected to its end. The roller is made of wear-resistant plastic to reduce friction with the well wall. The other end of the support arm 301 is rotatably connected to the outside of the support plate 102 and can swing flexibly. Two sets of anti-collision units 300 are symmetrically fixed on the same set of support plates 102. A fourth spring T4 is fixed between the support arms 301 in the two sets of anti-collision units 300. The fourth spring T4 provides elastic tension so that the roller always fits against the well wall. At the same time, it absorbs collision energy through elastic deformation and plays a buffer protection role.
[0051] In summary, during use, the three sets of sampling buckets 201 are respectively installed into the first layer A1, the second layer A2, and the third layer A3 of the support unit 100. During installation, the support plate 102 is inserted into the positioning groove 201a on the outer wall of the sampling bucket 201 to achieve radial positioning of the sampling bucket 201.
[0052] Then, the two half-rings of the fixing ring 109 are spliced to the outside of the first unit 103, the first retaining ring 104, and the second retaining ring 105, so that the retaining block 201c-1 of the top extension rod 201c of the sampling barrel 201 passes through the notch 109d-1 of the locking ring 109d. The fixing ring 109 is rotated so that the retaining block enters the track between the second ring plate 109b and the locking ring 109d, thus completing the axial locking of the sampling barrel 201.
[0053] Finally, check the reliability of the connection between the drive motor 107b, the drive cylinder 103b and the center rod 108, ensuring that the third protrusion 108c of the center rod 108 abuts against the adjusting sleeve 202a-2, the second protrusion 108b is located at the corresponding position at the top of the second adjusting gap 202a-2a, and the first protrusion 108a is located at the corresponding position at the top of the first adjusting gap 202a-2a. Then, fix the rope to the connecting cover 107a.
[0054] Next, the tool is lowered into the monitoring well using ropes. During the lowering process, the rollers 302 of the anti-collision unit 300 roll in close contact with the well wall, and the fourth spring T4 extends and retracts adaptively according to the curvature of the well wall to prevent the support plate 102 from colliding directly with the well wall. At the same time, the cooperation between the support plate 102 and the positioning slide 201a ensures that the sampling bucket 201 does not sway laterally until the sampling bucket 201 of the third layer A3 reaches the bottom monitoring well position, at which point the lowering stops.
[0055] Subsequently, sampling was carried out at the bottom layer (third layer A3), and the sample was left to stand for 10-15 minutes to allow the sampling bucket 201 to fully contact the groundwater at the bottom layer through the sampling port K. The drive cylinder 103b was activated to push the center rod 108 axially downward. The third protrusion 108c drove the cover 202 to press down through the adjusting sleeve 202a-2. The bottom ends of the center cover 202a and the side cover 202b were in contact with the first sealing strip 201a-1 and the second sealing strip 201a-2 at the top of the sampling bucket 201. The first gasket 201a-1a and the second gasket 201a-2a were deformed under pressure to achieve a seal.
[0056] At this time, the guide rod 202c-2 slides down along the fixed gap X2, the second toothed plate 202c-2a engages with the first toothed plate 201b-2c, the first spring T1 provides preload to ensure reliable locking, and the second spring T2 is compressed by the insertion sleeve 202a-1 to store the reset force; during this process, the first protrusion 108a and the second protrusion 108b slide within the adjustment gap 202a-2a of the first and second layer caps 202 respectively. Due to the design of the included angles α and β, they cannot drive the corresponding caps 202 to press down, ensuring that the first and second layer sampling buckets 201 remain open. The drive cylinder 103b drives the center rod 108 to reset, and the third layer sampling bucket 201 completes the sealing and retains the groundwater at the bottom layer.
[0057] When sampling the middle layer (second layer A2), the middle layer monitoring well area is accessed via a rope hoisting tool and left to stand for 5-10 minutes. The drive motor 107b is started to rotate the center rod 108, causing the second protrusion 108b to move from the corresponding position at the top of the second adjustment gap 202a-2a to the top of the adjustment sleeve 202a-2 where the adjustment gap 202a-2a is not opened. The first protrusion 108a moves to the corresponding position at the top of the second adjustment gap 202a-2a. The drive cylinder 103b pushes the center rod 108 down, repeating the bottom sealing action, so that the second layer cover 202 and the sampling bucket 201 are sealed and locked. At this time, the first layer sampling bucket 201 remains open, and the original bottom layer groundwater inside is replaced by the middle layer groundwater. After the center rod is reset, the middle layer sampling is completed.
[0058] The sampling process for the top layer (first layer A1) is the same as that for the middle layer. After the lifting tool is placed in the monitoring well area of the top layer, the center rod is rotated to move the first protrusion 108a away from the top opening of the second adjustment gap 202a-2a. The drive cylinder 103b pushes the center rod to achieve sealing and locking. The first layer sampling bucket 201 retains the groundwater of the top layer. At this time, all three sampling buckets 201 are sealed. After sealing, the engagement of the first toothed plate and the second toothed plate and the compression state of the sealing strip can ensure that the sample does not leak or cross-contaminate.
[0059] Finally, the tools are retrieved. The sampling tools are lifted out of the monitoring well at a constant speed using ropes. The fixing ring 109 is rotated so that the locking block 201c-1 is aligned with the notch 109d-1, and the sampling buckets 201 of each layer are taken out. The knob 201b-2b of the fixing clip 201b-2 is rotated to separate the first toothed plate 201b-2c from the second toothed plate 201b-2c. The second spring T2 pushes the cap 202 to reset and open, so that the groundwater samples of each layer can be poured out. After cleaning the sampling buckets 201, caps 202 and anti-collision units 300, the entire sampling process is completed.
[0060] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.
Claims
1. A groundwater multi-layer monitoring well sampling tool, characterized in that: include, A support unit (100) is provided with several sampling layers (A) and a control lever assembly (101) is provided in the support unit (100). The sampling unit (200) is located in the sampling layer (A) and includes a sampling bucket (201) and a cover (202). The cover (202) is located on the sampling bucket (201) and connected to the control lever assembly (101). Collision protection unit (300), wherein several sets of collision protection unit (300) are provided outside the support unit (100).
2. The groundwater multi-layer monitoring well sampling tool according to claim 1, characterized in that: The support unit (100) includes several sets of circumferentially arranged support plates (102), and a positioning gap (X1) is formed between the support plates (102). The top of the support plate (102) is fixed by a first unit (103). The first unit (103) fixes a first retaining ring (104), a second retaining ring (105) and an anti-collision pad (106) on one side of the outer wall of the support plate (102) at the bottom.
3. The groundwater multi-layer monitoring well sampling tool according to claim 2, characterized in that: The sampling layer (A) includes a first layer (A1), a second layer (A2) and a third layer (A3). The first layer (A1) is formed between the first unit (103) and the first retaining ring (104), the second layer (A2) is formed between the first retaining ring (104) and the second retaining ring (105), and the third layer (A3) is formed between the second retaining ring (105) and the anti-collision pad (106).
4. The groundwater multi-layer monitoring well sampling tool according to claim 2 or 3, characterized in that: The top of the first unit (103) is connected to the second unit (107) via a vertical beam (103a). The top of the second unit (107) is fixed with a connecting cover (107a), which is secured by ropes. The control lever assembly (101) includes a drive motor (107b), a drive cylinder (103b), and a center rod (108). The drive motor (107b) is fixedly connected to the middle of the second unit (107), and the drive cylinder (103b) is rotatably connected to the middle of the first unit (103). The output shaft of the drive motor (107b) is fixed to the top of the drive cylinder (103b) through a reducer (107c). The center rod (108) is fixedly connected to the piston rod of the drive cylinder (103b).
5. The groundwater multi-layer monitoring well sampling tool according to claim 4, characterized in that: The outer wall of the central rod (108) is provided with a first protrusion (108a), a second protrusion (108b) and a third protrusion (108c) at the same height along its axial direction. The first protrusion (108a), the second protrusion (108b) and the third protrusion (108c) are arranged sequentially from the top to the bottom of the central rod (108). An angle α is formed between the first protrusion (108a) and the second protrusion (108b), and an angle β is formed between the second protrusion (108b) and the third protrusion (108c). The angles α and β are equal.
6. The groundwater multi-layer monitoring well sampling tool according to any one of claims 2, 3 and 5, characterized in that: The outer wall of the sampling bucket (201) is provided with positioning grooves (201a) at equal intervals, and the support plate (102) is slidably inserted into the positioning grooves (201a); A fixed groove (201b) is also provided on the outer wall of the sampling bucket (201) between the positioning groove (201a). A sealing plate (201b-1) is also fixed at the outer opening of the fixed groove (201b). A fixed gap (X2) is formed between the sealing plate (201b-1) and the bottom of the fixed groove (201b). A fixing clip (201b-2) is slidably inserted into the middle of the sealing plate (201b-1). The fixing clip (201b-2) includes an adjusting slide rod (201b-2a). One end of the adjusting slide rod (201b-2a) is fixed to the knob (201b-2b), and the other end is rotatably inserted into the first toothed plate (201b-2c). A first spring (T1) is fixed between the knob (201b-2b) and the outer wall of the sealing plate (201b-1).
7. The groundwater multi-layer monitoring well sampling tool according to claim 6, characterized in that: The top of the sampling bucket (201) is provided with a sampling port (K) corresponding to the fixed slide groove (201b). An extension rod (201c) is fixedly connected to the top of the sampling bucket (201) on both sides of the sampling port (K). A locking block (201c-1) is also fixed to the top side wall of the extension rod (201c). A first sealing strip (201a-1) is fixed to the inner wall of the top of the sampling bucket (201) corresponding to the positioning groove (201a), and a first gasket (201a-1a) is fixed to the top of the first sealing strip (201a-1). A second sealing strip (201a-2) is fixed to the inner wall of the top of the sampling bucket (201) corresponding to the fixing groove (201b), and a second gasket (201a-2a) is fixed to the top of the second sealing strip (201a-2). The first sealing strip (201a-1) and the second sealing strip (201a-2) are connected by a third gasket (201a-3).
8. The groundwater multi-layer monitoring well sampling tool according to claim 7, characterized in that: The sampling bucket (201) has an adjustment hole (201d) in the middle of the bottom. A second spring (T2) is fixed at the top of the corresponding position of the adjustment hole (201d). A stabilizing sleeve (201e) is also sleeved on the outside of the second spring (T2). The bottom end of the stabilizing sleeve (201e) is fixed to the bottom of the sampling bucket (201). The cover (202) includes a central cover (202a) and several sets of side covers (202b) vertically fixed at the bottom of its outer edge. A plug sleeve (202a-1) is fixed at the middle of the bottom end of the central cover (202a). The plug sleeve (202a-1) is slidably inserted into the stabilizing sleeve (201e) and fixed by the second spring (T2). An adjusting sleeve (202a-2) is fixed at the middle of the top end of the central cover (202a). Several sets of adjusting gaps (202a-2a) are opened at the top end of the adjusting sleeve (202a-2a). The first protrusion (108a), the second protrusion (108b) and the third protrusion (108c) can slide in the corresponding adjusting gaps (202a-2a) respectively. The top of the center cover (202a) is also fixed with a connecting plate (202a-3) by a third spring (T3). A stabilizing side plate (202c) is fixed to the outer edge of the center cover (202a) corresponding to the side cover (202b). A transition rod (202c-1) is symmetrically fixed on the stabilizing side plate (202c). A guide rod (202c-2) is fixedly connected to the bottom of the transition rod (202c-1). The guide rod (202c-2) can be slidably inserted into the fixed gap (X2). A second toothed plate (202c-2a) is fixed to one side of the bottom of the fixed groove (201b) of the guide rod (202c-2). The first toothed plate (201b-2c) and the second toothed plate (202c-2a) are engaged and fixed.
9. The groundwater multi-layer monitoring well sampling tool according to claim 7 or 8, characterized in that: The first unit (103), the first retaining ring (104), and the second retaining ring (105) are all rotatably sleeved with a fixing ring (109), and the fixing ring (109) includes symmetrically detachable and fixed half rings; The top and bottom inner walls of the fixing ring (109) are respectively fixed with a first ring plate (109a) and a second ring plate (109b). The inner diameter of the second ring plate (109b) is smaller than that of the first ring plate (109a). The first platform (103), the first retaining ring (104), and the second retaining ring (105) can all be placed between the first ring plate (109a) and the second ring plate (109b). The bottom end of the second ring plate (109b) is fixed with an abutment ring (109c), and the bottom end of the abutment ring (109c) is fixed with a locking ring (109d). The locking block (201c-1) can slide between the second ring plate (109b) and the locking ring (109d). The locking ring (109d) has several sets of notches (109d-1) inside, and the locking block (201c-1) cooperates to pass through the notches (109d-1).
10. The groundwater multi-layer monitoring well sampling tool according to any one of claims 2, 3, 5, 7 and 8, characterized in that: The anti-collision unit (300) includes a support arm (301) and a roller (302) rotatably connected to its end. The other end of the support arm (301) is rotatably connected to the outside of the support plate (102). Two sets of anti-collision units (300) are symmetrically fixed on the same set of support plates (102). A fourth spring (T4) is fixed between the support arms (301) in the two sets of anti-collision units (300).