Sampling device for monitoring water quality of underground water

Abstract

The invention discloses a sampling device for underground water quality monitoring, and relates to the technical field of monitoring sampling, the sampling device comprises a lifting structure and a sampling container, and also comprises: a sealing structure arranged at the opening sides of the two ends of the sampling container; a placement groove is formed in the side wall of the placement frame, and a connecting ring is slidably arranged at the top; the opening-closing structure is used for controlling the sealing state of the sealing structure; the buckling seat is fixedly arranged at the bottom of the placing frame; a connecting buckle is arranged at the top of the connecting part, and a connecting piece is arranged at the bottom; two ends of the connecting rope are respectively connected with the connecting part and the placing rack; the releasing piece is arranged in the connecting part in a sliding manner and is used for releasing the buckling between the connecting buckle and the buckling seat; the pressure measuring part is installed on the side wall of the connecting part and used for driving the releasing piece to rise according to the pressure on the outer side of the connecting part. A two-stage strategy of coarse screening and fine checking is adopted, a rapid mode is used for unpolluted or low-risk monitoring wells, a fine mode is started for abnormal wells, and the contradiction between excessive sampling and insufficient sampling is avoided.

Description

Technical Field

[0001] This invention relates to the field of monitoring and sampling technology, specifically to a sampling device for monitoring groundwater quality. Background Technology

[0002] In the field of groundwater environmental monitoring, water quality sampling is a crucial step in obtaining monitoring data, and its efficiency and accuracy directly affect the timeliness of pollution assessment, risk warning, and remediation decisions. Currently, water quality sampling for multiple monitoring wells generally adopts a single mode: either comprehensive and detailed sampling and testing of all monitoring wells is carried out, or rapid screening is achieved by simplifying the sampling process, but it is difficult to balance efficiency and accuracy.

[0003] Specifically, the existing technology has the following problems: On the one hand, if each monitoring well is sampled meticulously according to high-precision detection requirements (such as controlling sampling depth, multiple well washing, and stratified sampling), accurate data can be obtained, but the operation process is complex and time-consuming. Especially when there are a large number of monitoring wells (such as around industrial sites or in regional groundwater surveys), the sampling cycle will be significantly extended, and the manpower and equipment costs will increase significantly, making it difficult to meet the need to quickly grasp the overall water quality of the area. On the other hand, if a uniform coarse sampling method is adopted in pursuit of efficiency, although the sampling time can be shortened, it is impossible to conduct in-depth analysis of suspected contaminated wells. Pollution details (such as pollutant concentration gradients and vertical distribution characteristics) may be missed, resulting in inaccurate pollution assessment and affecting the formulation of subsequent treatment measures.

[0004] Furthermore, in actual monitoring, the pollution risk varies among monitoring wells within a region. Some wells may be uncontaminated or only slightly contaminated, while others may be severely contaminated. Existing sampling devices lack adaptability to this variability, making it impossible to first screen high-risk monitoring wells through rapid, coarse sampling before focusing on detailed sampling. This leads to contradictions of oversampling or undersampling during large-area monitoring, wasting resources and making it difficult to guarantee the validity of the data.

[0005] Therefore, developing a device that can first perform rapid and coarse sampling on multiple monitoring wells to shorten the overall sampling time, and then perform targeted and detailed sampling on pollution monitoring wells based on preliminary results, is the key to solving the above-mentioned contradiction between efficiency and accuracy, and is of great significance for improving the economy and scientific nature of groundwater quality monitoring. Summary of the Invention

[0006] The technical solution of the present invention is to provide a sampling device for groundwater quality monitoring, which adopts a two-stage strategy of coarse screening followed by fine screening. A fast mode is used for uncontaminated or low-risk monitoring wells, and a fine mode is activated for abnormal wells, so as to avoid the contradiction between over-sampling and under-sampling.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a sampling device for groundwater quality monitoring, comprising a lifting structure and a sampling container, and further comprising: A sealing structure is provided on the open sides at both ends of the sampling container to seal the ends of the sampling container; A placement rack is set between the lifting structure and the sampling container, and the side wall of the placement rack is provided with a placement groove for placing the sampling container, and the top is slidably provided with a connecting ring for connecting the lifting structure; The opening and closing structure is located on the side of the placement groove and is used to control the sealing state of the sealing structure. The opening and closing structure is connected to the connecting ring through a quick-release structure. When the sampling container is inserted into the placement groove, the opening and closing structure moves the sealing plug in the sealing structure away from both ends of the sampling container, so that both ends of the sampling container are opened. The fastener is fixed at the bottom of the shelf; The connecting part is located below the placement frame, and has a connecting buckle at the top and a connecting piece at the bottom; the connecting piece can be assembled with the connecting ring; the connecting buckle is fastened to the fastening seat, so that the connecting part is installed at the bottom of the fastening seat; The connecting rope is connected at both ends to the connecting part and the placement frame, respectively. The release element is slidably disposed within the connecting part and is used to release the connection between the connecting buckle and the fastening seat; The pressure testing part is installed on the side wall of the connecting part and is used to drive the release element to rise a certain distance according to the pressure on the outside of the connecting part; when the connecting part reaches the specified depth, the release element releases the connecting buckle and engages with the fastening seat.

[0008] As a further aspect of the present invention, each of the sealing structures includes: The assembly is threaded onto the end of the sampling container; The sealing plug is slidably positioned with the assembly. A sealing spring, with its two ends respectively positioned between the sealing plug and the assembly; The synchronization key is fixed to the side wall of the sealing plug.

[0009] As a further aspect of the present invention, assembly slots are provided on both sides of the placement slot, and the opening and closing structure includes: An open spring is provided in the assembly slot, wherein the fixed end of the open spring is fixed to the placement frame and the movable end is attached to the inner wall of the assembly slot; The clearance component is slidably disposed in the placement frame and located on both sides of the placement groove. The end of the clearance component can extend into the assembly groove and be flush with the fixed end of the opening spring piece, and is used to limit the reset of the sealing plug by the synchronization key. A wedge-shaped component is fixed to the side wall of the relief component; The transmission component is slidably disposed in the placement frame and connected to the connecting ring through a quick-release structure. The end branch of the transmission component extends into the wedge-shaped component and can drive the positioning component to disengage from the assembly groove through the wedge-shaped component, thereby releasing the restriction on the synchronization key and allowing the sealing plug to seal the sampling container.

[0010] As a further aspect of the present invention, the placement frame is provided with a delay structure for delaying the start-up time of the opening and closing structure, the delay structure comprising: The delay cavity is located inside the placement frame and has a conical hole at the bottom; A time-delay slip ring is slidably disposed in a time-delay cavity. A connecting rod is fixedly mounted on the time-delay slip ring, and the top of the connecting rod passes through the time-delay cavity and is fixedly mounted to the transmission component. A trigger plate is flexibly slidably disposed at the bottom of the placement frame, and a flow control plug for sealing the conical hole is fixedly provided on the trigger plate; When the connector is installed at the bottom of the fastener, the bottom of the trigger plate is squeezed by the connector, causing the flow control plug to block the conical hole.

[0011] As a further aspect of the present invention, the connecting portion is provided with a release cavity, and the release component includes: The release top ring is slidably mounted on the top of the connecting part via a slide rod; The tripping slip ring is slidably disposed in the tripping cavity and is used to lift the tripping top ring so that the connecting buckle disengages from the buckle seat; The ejection mechanism is located between the release slip ring and the release top ring.

[0012] As a further aspect of the present invention, the ejection structure includes: The ejector slip ring is slidably disposed within the tripping cavity, and an elastic element is provided between it and the tripping slip ring; A power-accumulating buckle is rotatably mounted in the release cavity. The power-accumulating buckle has a power-accumulating part and a triggering part on its side wall. The power-accumulating part has a triangular structure, and the triggering part has an inclined end face. A trigger element is fixed on the tripping slip ring, and the top of the trigger element is provided with a trigger end that matches the inclined section.

[0013] As a further embodiment of the present invention, the pressure measuring part is a pressure measuring airbag, and the pressure measuring airbag is connected to the tripping cavity.

[0014] As a further embodiment of the present invention, the lifting structure includes a lifting rope, and a hollow bolt is fixedly installed at the end of the lifting rope, the hollow bolt being threaded onto the connecting ring.

[0015] As a further embodiment of the present invention, the quick-release structure includes a fixing rod fixed to the transmission component, the fixing rod passing through the placement frame, the connecting ring being fixed with a bracket, and the bracket and the fixing rod being quickly disassembled and assembled via a nut.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, during rapid screening, a lifting structure is used to uniformly lower the placement frame and the sampling container (which is in the open state) to the target depth. Once the sampling container reaches the designated depth of the monitoring well, the lifting structure lifts the placement frame and sampling container upwards. The opening and closing structure then switches the sealing state of the sealing structure again, i.e., the sealing plug moves forward to the closed position, sealing both ends of the sampling container, allowing some water sample to remain inside the container, thus achieving rapid sampling. The entire sampling process is relatively simple; sampling can be completed through the up-and-down movement of the lifting structure and the automatic switching of the opening and closing structure. It is suitable for use in situations requiring rapid acquisition of large amounts of water samples, such as regional groundwater surveys, and can effectively shorten the sampling time for a single well.

[0017] 2. In this invention, during multi-layer fine sampling, multiple sampling devices are cascaded through the longitudinal assembly of connecting buckles and fastening seats. The entire device is then uniformly lowered into the detection well using a lifting structure. The mechanical connection between the connecting buckles and fastening seats is released by a release component, causing the placement frame to separate from the connecting part. The connecting part is triggered to separate sequentially at each target depth. After all placement frames are in place, the opening and closing structure synchronously drives the sealing structure of each layer, sealing both ends of the sampling container at the corresponding depth to ensure that there is no cross-contamination of water samples from each layer. The device is removed in stages through the lifting structure, completing layered sampling and accurately capturing the vertical distribution characteristics of pollutants, meeting the high-precision data requirements for pollution source tracing and risk assessment. Through a two-stage strategy of coarse screening followed by fine inspection, a rapid mode is used for uncontaminated or low-risk monitoring wells, while a fine mode is activated for abnormal wells, avoiding the contradiction between over-sampling and under-sampling. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the 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 a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point B; Figure 5 This is a schematic cross-sectional view of the connecting part of the present invention; Figure 6 For the present invention Figure 5Enlarged structural diagram at point C; Figure 7 This is a schematic diagram of the internal structure's movement trajectory before the connecting part of the present invention disengages; Figure 8 This is a schematic diagram of the sampling container and its connection structure according to the present invention; Figure 9 This is a schematic diagram of the clearance component structure of the present invention; Figure 10 This is a schematic diagram of the serial unfolded form and the storage form of the present invention; The attached diagram lists the components represented by each number as follows: 1. Placement rack; 11. Placement slot; 12. Connecting ring; 13. Sampling container; 14. Fastening seat; 2. Sealing structure; 21. Assembly parts; 22. Sealing plug; 23. Sealing spring; 24. Synchronization key; 3. Opening and closing structure; 31. Assembly slot; 32. Opening spring; 33. Relief part; 34. Wedge-shaped part; 35. Transmission part; 4. Delay structure; 41. Delay cavity; 42. Conical hole; 43. Delay slip ring ; 44. Connecting rod; 45. Trigger plate; 46. Flow control plug; 5. Connecting part; 51. Connecting buckle; 52. Connecting piece; 53. Connecting rope; 54. Pressure measuring part; 6. Release part; 61. Release cavity; 62. Release top ring; 63. Release slip ring; 7. Ejection structure; 71. Ejection slip ring; 72. Elastic element; 73. Power storage buckle; 74. Power storage part; 75. Trigger part; 76. Trigger piece; 77. Trigger end. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-10 The present invention provides a technical solution: a sampling device for groundwater quality monitoring, comprising a lifting structure and a sampling container 13, and further comprising: A sealing structure 2 is provided on the open sides of both ends of the sampling container 13. The sealing structure 2 is used to seal the ends of the sampling container 13. A placement rack 1 is provided between the lifting structure and the sampling container 13. The side wall of the placement rack 1 is provided with a placement groove 11 for placing the sampling container 13, and a connecting ring 12 for connecting the lifting structure is slidably provided on the top. The opening and closing structure 3 is provided on the side of the placement groove 11. The opening and closing structure 3 is connected to the connecting ring 12 through a quick-release structure. The opening and closing structure 3 is used to control the sealing state of the sealing structure 2. When the sampling container 13 is placed into the placement slot 11, the opening and closing structure 3 moves the sealing plug 22 in the sealing structure 2 away from both ends of the sampling container 13, so that both ends of the sampling container 13 are opened; during coarse sampling, the lifting structure drives the connecting ring 12 to move relative to the placement frame 1, actively triggering the opening and closing structure 3 to release the restriction on the sealing structure 2, so that the sealing structure 2 seals both ends of the sampling container 13. Fastening seat 14 fixed at the bottom of the placement rack 1; A connecting part 5 is provided below the placement rack 1. The connecting part 5 has a connecting buckle 51 at the top and a connecting piece 52 at the bottom. The connecting piece 52 can be assembled with the connecting ring 12. The connecting buckle 51 is fastened to the fastening seat 14, so that the connecting part 5 is installed at the bottom of the fastening seat 14. A connecting rope 53 is provided between the connecting part 5 and the placement frame 1; The release element 6 is slidably disposed in the connecting part 5. The release element 6 is used to release the connection between the connecting buckle 51 and the fastening seat 14, so that the connecting part 5 is separated from the placement frame 1. The pressure measuring part 54 is installed on the side wall of the connecting part 5. The pressure measuring part 54 is used to drive the release member 6 to rise a distance according to the pressure on the outside of the connecting part 5. When the connecting part 5 reaches the specified depth, the release member 6 releases the connecting buckle 51 from the fastening seat 14. The coarse sampling mode (i.e., rapid screening) involves the following steps: Pre-treatment stage: Disconnect the mechanical connection between the connecting part 5 and the placement rack 1, that is, release the connecting buckle 51 from the fastening seat 14, and remove the connecting rope 53 between the connecting part 5 and the placement rack 1; insert the sampling container 13 horizontally into the placement groove 11, and switch the sealing state of the sealing structure 2 through the opening and closing structure 3, that is, the sealing plug 22 moves back (away from the sampling container 13) to the open position, and the sampling container 13 is opened at both ends.

[0022] Sampling Stage: Using a lifting structure, the placement frame 1 and the open sampling container 13 are lowered at a constant speed to the target depth. Once the sampling container 13 reaches the designated depth of the monitoring well, the placement frame 1 and sampling container 13 are lifted upwards using the lifting structure. The opening and closing structure 3 then switches the sealing state of the sealing structure 2 again, i.e., the sealing plug 22 moves forward (closer to the sampling container 13) to the closed position, sealing both ends of the sampling container 13, allowing some water sample to remain inside the sampling container 13. After the sampling container 13 is removed from the monitoring well, it is taken off the placement tank 11, thus completing the preliminary sampling. The water sample is then sent for testing, and the results are awaited.

[0023] When the test results are abnormal and further refined sampling is required (i.e., stratified sampling), the specific steps are as follows: Pre-treatment stage: Calculate the required number of devices N based on the monitoring well depth (H), N=H / 10m (rounded up +1), connect the connecting part 5 and the placement frame 1 on the same sampling device to the fastening seat 14 through the connecting buckle 51, and then connect the sampling devices in series longitudinally. Separation Stage: The assembled sampling devices are lowered into the detection well via a lifting structure. As the sampling devices descend deeper, the water pressure they experience gradually increases. When the connecting part 5 in the top sampling device reaches the designated depth, the lifting structure stops descending. At this point, the water pressure reaches the trigger condition of the pressure measuring part 54, which releases the connecting buckle 51 from the fastening seat 14 via the release piece 6, disengaging the connecting buckle 51 from the fastening seat 14. The first placement frame 1 stops descending, while the first connecting part 5 continues to descend with the other sampling devices under gravity. When the connecting rope 53 at the bottom of the first placement frame 1 becomes taut (the length of the connecting rope 53 is determined according to the required spacing), the first connecting part 5 stops descending. At this point, the pressure measuring part 54 on the outside of the connecting part 5 of the second sampling device reaches the trigger condition, causing the second connecting part 5 to disengage from the second placement frame 1, and so on, until the lowest placement frame 1 reaches the designated depth.

[0024] Sampling stage: After the water fluctuations in the detection well cease, the opening and closing structure 3 seals both ends of the sampling container 13 at the same depth through the sealing structure 2. After the sampling container 13 is completely sealed, the sampling device is removed from the detection well sequentially through the lifting structure, and the sampling container 13 is removed again for testing.

[0025] In summary, during rapid screening, the placement frame 1 is quickly deployed to the designated depth of the detection well via a lifting structure, and then lifted out of the detection well via the same lifting structure. When the lifting structure is lifted, the sampling container 13 is sealed at both ends through the rapid sealing switch of the opening and closing structure 3, thereby shortening the sampling time per well and meeting the needs of rapid screening in regional groundwater surveys. During stratified sampling, the linkage mechanism between the pressure measuring unit 54 triggered by water pressure and the release component 6 enables the adjustment of the sampling device spacing to sample groundwater at different depths. It can also automatically separate and synchronously seal the samples, resulting in vertical distribution of water samples and avoiding the problem of missing pollution details caused by traditional uniform sampling.

[0026] During multi-layer fine sampling, multiple sampling devices are cascaded by longitudinally assembling the connecting buckle 51 and the fastening seat 14. The entire device is then lowered into the detection well at a uniform speed using a lifting structure. When the connecting part 5 of the first sampling device reaches the first target depth, water pressure triggers the pressure measuring part 54, which releases the mechanical connection between the connecting buckle 51 and the fastening seat 14 via the release part 6, stopping the descent of the first-layer placement frame 1. The connecting part 5 continues to descend with the device, and subsequent connecting parts 5 are triggered to separate at each target depth (sampling interval between 5m and 10m). After all the placement racks 1 are in place, the opening and closing structure 3 synchronously drives the sealing structure 2 of each layer, sealing both ends of the sampling container 13 at the corresponding depth to ensure that there is no cross-contamination of water samples from each layer; the lifting structure is used to remove the device in stages to complete the layered sampling, accurately capture the vertical distribution characteristics of pollutants, and meet the high-precision data requirements of pollution source tracing and risk assessment; through a two-stage strategy of first coarse screening and then fine inspection, a fast mode is used for uncontaminated or low-risk monitoring wells, and a fine mode is activated for abnormal wells, avoiding the contradiction between over-sampling and under-sampling.

[0027] In addition, during the detachment process, the samplers detach sequentially upon reaching the designated depth. The disturbance generated by each detachment action is relatively small, and because the samplers detach one by one and remain at different depths, the influence of the previously detached samplers on the water flow has gradually subsided by the time subsequent samplers detach, thus preventing the superposition of disturbances.

[0028] As a further aspect of the present invention, each of the sealing structures 2 includes: Accessory 21 is threadedly connected to the end of sampling container 13; The sealing plug 22 is slidably disposed with the assembly 21; The sealing spring 23 has its two ends respectively positioned between the sealing plug 22 and the assembly 21; Synchronization key 24 is fixed to the side wall of sealing plug 22; For details, see Figure 1 , Figure 2 and 8 Before use, the sealing structure 2 is assembled on both ends of the sampling container 13 using the fitting 21; the fitting 21 and the sampling container 13 are connected by threads, and the connection must be sealed. When the sampling container 13 is inserted into the placement slot 11, the opening and closing structure 3 drives the sealing plug 22 away from the end of the sampling container 13 by driving the synchronization key 24 away from the sampling container 13, thereby opening the end of the sampling container 13. At the same time, the sealing plug 22 stretches the sealing spring 23. When the opening and closing structure 3 removes the restriction on the synchronization key 24, the sealing spring 23 quickly resets the sealing plug 22, so that the end of the sampling container 13 is resealed, and the sampling is completed.

[0029] As a further embodiment of the present invention, assembly slots 31 are provided on both sides of the placement slot 11, and the opening and closing structure 3 includes: An open spring piece 32 is disposed in the assembly groove 31, wherein the fixed end of the open spring piece 32 is fixed to the placement frame 1 and the movable end is attached to the inner wall of the assembly groove 31. The clearance member 33 is slidably disposed in the placement frame 1 and located on both sides of the placement groove 11. The end of the clearance member 33 can extend into the assembly groove 31 and be flush with the fixed end of the opening spring 32, and is used to restrict the reset of the sealing plug 22 by the synchronization key 24. Wedge-shaped member 34 is fixed to the side wall of relief member 33; The transmission component 35 is slidably disposed in the placement frame 1 and connected to the connecting ring 12 through a quick-release structure. The end branch of the transmission component 35 extends into the wedge-shaped component 34 and can drive the release component 33 to disengage from the assembly groove 31 through the wedge-shaped component 34, thereby releasing the restriction on the synchronization key 24 and causing the sealing plug 22 to seal the sampling container 13. For details, see Figures 1 to 3 When the sampling container 13 is placed into the placement slot 11, the synchronization key 24 will enter the assembly slot 31 synchronously and be guided by the opening spring 32. The synchronization key 24 will drive the sealing plug 22 away from the sampling container 13, thereby switching the sealing state of the sealing structure 2, so that both ends of the sampling container 13 are in the open state for sampling operation. During rapid screening, the lifting structure connecting ring 12 can rise accordingly (moving upward relative to the placement frame 1), and the transmission component 35 rises synchronously, thereby squeezing the wedge-shaped component 34. Under the driving force of the wedge-shaped component 34, the end of the positioning component 33 moves out of the assembly groove 31, releasing the restriction on the synchronization key 24. At this time, the synchronization key 24 is reset under the action of the sealing spring 23, so that both ends of the sampling container 13 are sealed.

[0030] When the sampling container 13 is removed, the synchronization key 24 and the sealing plug 22 move horizontally. During this movement, the synchronization key 24 pushes the movable end of the opening spring 32, gradually disengaging it from the assembly groove 31 until the synchronization key 24 passes through the gap between the opening spring 32 and the assembly groove 31. Afterward, the opening spring 32 automatically resets. Throughout this process, the synchronization key 24 remains at a constant horizontal height, ensuring that both ends of the sampling container 13 remain sealed, effectively preventing sample leakage.

[0031] As a further aspect of the present invention, the placement rack 1 is provided with a delay structure 4 for delaying the start-up time of the opening and closing structure 3, the delay structure 4 comprising: The delay cavity 41 is located inside the placement frame 1, and a conical hole 42 is provided at the bottom; A delay slip ring 43 is slidably disposed in a delay cavity 41. A connecting rod 44 is fixedly disposed on the delay slip ring 43. The top of the connecting rod 44 passes through the delay cavity 41 and is fixedly disposed with the transmission component 35. A trigger plate 45 is elastically slidably disposed at the bottom of the placement frame 1, and a flow control plug 46 for sealing the conical hole 42 is fixedly provided on the trigger plate 45; When the connecting part 5 is installed at the bottom of the fastening seat 14, the bottom of the trigger plate 45 is squeezed by the connecting part 5, causing the flow control plug 46 to block the conical hole 42. See Figure 3 and Figure 4 During the stratified sampling process, when the connecting part 5 disengages from the placement frame 1, the trigger plate 45 moves downward relative to the placement frame 1, and at the same time drives the flow control plug 46 away from the conical hole 42, creating a gap between the two. Water in the detection well enters the delay chamber 41 through the conical hole 42. As the water level in the delay chamber 41 rises, the delay slip ring 43 gradually rises. The delay slip ring 43 drives the transmission component 35 to rise through the connecting rod 44, causing the displacement component 33 to move and release the restriction on the synchronization key 24. This delays the sealing time of the opening and closing structure 3 triggering the sealing structure 2 during the stratified sampling process, allowing the water in the detection well sufficient time to settle and reducing the error caused by water sample disturbance.

[0032] As a further embodiment of the present invention, the connecting portion 5 is provided with a release cavity 61, and the release member 6 includes: The release top ring 62 is slidably mounted on the top of the connecting part 5 via a slide rod; The tripping slip ring 63 is slidably disposed in the tripping cavity 61 and is used to lift the tripping top ring 62 so that the connecting buckle 51 is disengaged from the buckle seat 14. The ejection structure 7 is disposed between the release slip ring 63 and the release top ring 62; As a further aspect of the present invention, the ejection structure 7 includes: The ejection slip ring 71 is slidably disposed in the release cavity 61, and an elastic element 72 is disposed between it and the release slip ring 63; The power-saving buckle 73 is rotatably disposed in the release cavity 61. The power-saving buckle 73 has a power-saving part 74 and a trigger part 75 on its side wall. The power-saving part 74 has a triangular structure, and the trigger part 75 has an inclined end face. A trigger 76 is fixed on the tripping slip ring 63, and the top of the trigger 76 is provided with a trigger end 77 that matches the inclined section; As a further embodiment of the present invention, the pressure measuring part 54 is a pressure measuring airbag, and the pressure measuring airbag is connected to the tripping cavity 61; For details, see Figure 5When the connecting part 5 is inserted into the detection well along with the whole device, the water pressure (P) in the well increases linearly with the depth (H) (P=ρgH, where ρ is the density of water and g is the acceleration due to gravity). The water pressure outside the connecting part 5 is transmitted to the pressure-bearing chamber of the pressure measuring part 54. The inert gas pre-filled in the pressure-bearing chamber (the amount of gas filling decreases from top to bottom, and the release time and required pressure of the connecting part 5 are controlled by the amount of gas filling) is compressed (compression amount ΔV=V0×(1-P0 / P), where V0 is the initial volume and P0 is the initial pressure). The gas is forced into the trip chamber 61, causing the gas pressure in the trip chamber 61 to gradually increase.

[0033] The high-pressure gas in the trip chamber 61 acts on the bottom of the trip slip ring 63, generating an upward thrust. After overcoming the static friction between the trip slip ring 63 and the inner wall of the trip chamber 61, the trip slip ring 63 is pushed upward. The trip slip ring 63 transmits power to the ejection slip ring 71 through the elastic element 72, driving the ejection slip ring 71 to rise synchronously.

[0034] At this time, the energy storage part 74 (wedge structure) of the energy storage buckle 73 restricts the top of the ejection slip ring 71 from rising, forming a mechanical limit and preventing the ejection slip ring 71 from continuing to rise; as the release slip ring 63 continues to rise, the elastic element 72 is further compressed, and the stored elastic potential energy gradually increases; at the same time, the trigger element 76 (rigidly connected to the release slip ring 63) rises synchronously with the release slip ring 63, and its trigger end 77 gradually approaches the trigger part 75 of the energy storage buckle 73.

[0035] When the trigger end 77 contacts the trigger part 75, the trigger end 77 applies a horizontal component force to the trigger part 75, driving the energy storage buckle 73 to rotate around the hinge point of the energy storage buckle 73; the energy storage part 74 deflects with the energy storage buckle 73 and then disengages from the limit on the upper surface of the ejection slip ring 71, releasing the mechanical constraint on the ejection slip ring 71; at this time, the elastic element 72 releases the stored elastic potential energy, driving the ejection slip ring to pop out instantly, and the ejection slip ring 71 applies an impact force to the connecting buckle 51 through the release top ring 62, causing the elastic claw of the connecting buckle 51 to undergo elastic deformation and disengage from the slot of the buckle seat 14; after the connecting part 5 loses its mechanical connection, it falls freely under the action of gravity (the falling distance is set according to the target depth), realizing the precise separation of the connecting part 5 from the placement frame 1.

[0036] As a further embodiment of the present invention, the lifting structure includes a lifting rope, and a hollow bolt is fixedly installed at the end of the lifting rope, the hollow bolt being threaded onto the connecting ring 12; Specifically, such as Figure 1 and Figure 3 As shown, the hollow bolt can be threaded to the connecting ring 12, thereby quickly completing the assembly and disassembly of the lifting structure and the placement frame 1, which greatly facilitates the maintenance and upkeep of the sampling device and longitudinal connection.

[0037] As a further embodiment of the present invention, the quick-release structure includes a fixing rod fixed to the transmission component 35, the fixing rod passing through the placement frame 1, and a bracket fixed to the connecting ring 12. The bracket and the fixing rod are quickly disassembled and assembled by a nut. The transmission component 35 and the connecting ring 12 can be quickly connected by the nut, which facilitates the triggering of the sealing structure 2 during the rapid screening process, thereby achieving effective sealing of the sampling container 13.

Claims

1. A sampling device for groundwater quality monitoring, comprising a lifting structure and a sampling container (13), characterized in that: A sealing structure (2) is provided on the open sides at both ends of the sampling container (13) to seal the ends of the sampling container (13); The placement rack (1) is set between the lifting structure and the sampling container (13), and the side wall of the placement rack (1) is provided with a placement groove (11) for placing the sampling container (13), and the top is slidably provided with a connecting ring (12) for connecting the lifting structure. The opening and closing structure (3) is set on the side of the placement groove (11) to control the sealing state of the sealing structure 2. The opening and closing structure (3) is connected to the connecting ring (12) through the quick-release structure. When the sampling container (13) is inserted into the placement groove (11), the opening and closing structure (3) moves the sealing plug (22) in the sealing structure (2) away from both ends of the sampling container (13), so that both ends of the sampling container (13) are opened. The fastening seat (14) is fixed to the bottom of the placement rack (1); The connecting part (5) is located below the placement frame (1), and has a connecting buckle (51) at the top and a connecting piece (52) at the bottom; the connecting piece (52) can be assembled with the connecting ring (12); the connecting buckle (51) is fastened to the fastening seat (14), so that the connecting part (5) is installed at the bottom of the fastening seat (14); The connecting rope (53) is connected at both ends to the connecting part (5) and the placement frame (1); The release element (6) is slidably disposed in the connecting part (5) and is used to release the connection between the connecting buckle (51) and the fastening seat (14); The pressure measuring part (54) is installed on the side wall of the connecting part (5) and is used to drive the release member (6) to rise a distance according to the pressure on the outside of the connecting part (5); when the connecting part (5) reaches the specified depth, the release member (6) releases the connecting buckle (51) from the fastening seat (14).

2. A sampling device for groundwater quality monitoring according to claim 1, characterized in that: Each of the sealing structures (2) includes: The fitting (21) is threaded to the end of the sampling container (13); The sealing plug (22) is slidably set with the assembly (21); The sealing spring (23) is positioned at both ends between the sealing plug (22) and the assembly (21); Synchronization key (24) is fixed to the side wall of sealing plug (22).

3. A sampling device for groundwater quality monitoring according to claim 2, characterized in that: Assembly slots (31) are provided on both sides of the placement slot (11), and the opening and closing structure (3) includes: An open spring (32) is set in the assembly groove (31). The fixed end of the open spring (32) is fixed to the placement frame (1), and the movable end is attached to the inner wall of the assembly groove (31). The clearance member (33) is slidably disposed in the placement rack (1) and located on both sides of the placement groove (11). The end of the clearance member (33) can extend into the assembly groove (31) and be flush with the fixed end of the opening spring (32) for limiting the reset of the sealing plug (22) by the synchronization key (24). A wedge-shaped member (34) is fixed to the side wall of the relief member (33); The transmission component (35) is slidably disposed in the placement frame (1) and connected to the connecting ring (12) through a quick-release structure. The end branch of the transmission component (35) extends into the wedge (34) and can drive the release component (33) to disengage from the assembly groove (31) through the wedge (34) and release the restriction on the synchronization key (24) so ​​that the sealing plug (22) seals the sampling container (13).

4. A sampling device for groundwater quality monitoring according to claim 3, characterized in that: The placement rack (1) is provided with a delay structure (4) for delaying the start time of the opening and closing structure (3), the delay structure (4) including: The delay cavity (41) is located inside the placement rack (1) and has a conical hole (42) at the bottom. A delay slip ring (43) is slidably disposed in a delay cavity (41). A connecting rod (44) is fixedly disposed on the delay slip ring (43). The top of the connecting rod (44) passes through the delay cavity (41) and is fixedly disposed with the transmission component (35). A trigger plate (45) is elastically slidably disposed at the bottom of the placement rack (1), and a flow control plug (46) for sealing the conical hole (42) is fixedly provided on the trigger plate (45). When the connecting part (5) is installed at the bottom of the fastening seat (14), the bottom of the trigger plate (45) is squeezed by the connecting part (5), causing the flow control plug (46) to block the conical hole (42).

5. A sampling device for groundwater quality monitoring according to claim 1, characterized in that: The connecting part (5) has a tripping cavity (61), and the tripping component (6) includes: The release top ring (62) is slidably mounted on the top of the connecting part (5) via a slide rod; The tripping slip ring (63) is slidably disposed in the tripping cavity (61) and is used to lift the tripping top ring (62) so that the connecting buckle (51) disengages from the buckle seat (14). The ejection structure (7) is located between the release slip ring (63) and the release top ring (62).

6. A sampling device for groundwater quality monitoring according to claim 5, characterized in that: The ejection structure (7) includes: The ejection slip ring (71) is slidably disposed in the release cavity (61), and an elastic element (72) is disposed between it and the release slip ring (63). A power-saving buckle (73) is rotatably disposed in the release cavity (61). The power-saving buckle (73) has a power-saving part (74) and a trigger part (75) on its side wall. The power-saving part (74) has a triangular structure, and the trigger part (75) has an inclined end face. A trigger (76) is fixed on the tripping slip ring (63), and the top of the trigger (76) is provided with a trigger end (77) that matches the inclined section.

7. A sampling device for groundwater quality monitoring according to claim 1, characterized in that: The pressure measuring unit (54) is a pressure measuring airbag, which is connected to the tripping chamber (61).

8. A sampling device for groundwater quality monitoring according to claim 1, characterized in that: The lifting structure includes a lifting rope, and a hollow bolt is fixedly installed at the end of the lifting rope. The hollow bolt is threaded onto the connecting ring (12).

9. A sampling device for groundwater quality monitoring according to claim 3, characterized in that: The quick-release structure includes a fixed rod fixed to the transmission component (35), the fixed rod passing through the placement frame (1), the connecting ring (12) is fixed with a bracket, and the bracket and the fixed rod are quickly disassembled and assembled by a nut.

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