A sampling device for groundwater quality monitoring

Abstract

The application discloses a sampling device for groundwater quality monitoring and relates to the technical field of monitoring sampling, which comprises a lifting structure and a sampling container, and further comprises a sealing structure arranged at the opening sides of both ends of the sampling container, a placing rack with a placing groove formed in the side wall and a connection ring slidingly arranged at the top, an opening and closing structure for controlling the sealing state of the sealing structure, a buckling seat fixedly arranged at the bottom of the placing rack, a connection part with a connection buckle arranged at the top and a connection piece arranged at the bottom, a connection rope with two ends connected with the connection part and the placing rack respectively, a tripping piece slidingly arranged in the connection part and used for releasing the buckling of the connection buckle and the buckling seat, and a pressure measuring part installed on the side wall of the connection part and used for driving the tripping piece to ascend according to the pressure on the outside of the connection part. The two-stage strategy of rough screening first and fine checking later is adopted, the fast mode is used for the non-polluted or low-risk monitoring well, the fine mode is started for the abnormal well, and the contradiction between over-sampling and insufficient sampling is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of monitoring sampling, in particular to a sampling device for groundwater quality monitoring. BACKGROUND

[0002] In the field of groundwater environmental monitoring, water quality sampling is a key link to obtain monitoring data, and its efficiency and accuracy directly affect the timeliness of pollution assessment, risk warning and decision-making. Currently, the water quality sampling of multiple monitoring wells generally adopts a single mode: either all monitoring wells are sampled and detected in detail, 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 in detail according to the high-precision detection requirements (such as controlling the sampling depth, multiple well washing, and layered collection), although accurate data can be obtained, the operation process is complex and time-consuming, especially when the number of monitoring wells is large (such as industrial site surroundings, regional groundwater survey, etc.), which will lead to a significant extension of the sampling period, a significant increase in labor and equipment costs, and difficulty in meeting the demand for quickly grasping the overall water quality of the region; on the other hand, if a unified rough sampling method is used to pursue efficiency, it cannot be used for in-depth analysis of suspected contaminated wells, which may miss pollution details (such as pollutant concentration gradient, vertical distribution characteristics, etc.), leading to inaccurate pollution assessment and affecting the development of subsequent remediation measures.

[0004] In addition, in actual monitoring, the pollution risk of each monitoring well in the region is different, and some monitoring wells may be in a non-polluted or slightly polluted state, while some may be severely contaminated. The existing sampling device lacks adaptability to such differentiation, and cannot first screen out high-risk monitoring wells through rapid rough sampling and then conduct detailed sampling on them, leading to the contradiction of over-sampling or under-sampling in large-area monitoring, which not only wastes resources but also makes it difficult to ensure the effectiveness of the data.

[0005] Therefore, the development of a device that can first perform rapid rough sampling on multiple monitoring wells to shorten the overall sampling time, and then conduct detailed sampling on contaminated monitoring wells according to the preliminary results, is the key to solving the contradiction between efficiency and accuracy, and has important significance for improving the economy and scientificity of groundwater quality monitoring. SUMMARY

[0006] The technical solution of the present application provides a sampling device for groundwater quality monitoring, which adopts a two-stage strategy of rough screening first and detailed checking later, uses a rapid mode for non-polluted or low-risk monitoring wells, and starts a detailed mode for abnormal wells, avoiding the contradiction between over-sampling and under-sampling.

[0007] To achieve the above object, the application provides the following technical scheme: a sampling device for groundwater quality monitoring, comprising a lifting structure and a sampling container, further comprising:

[0008] A sealing structure is arranged at the opening side of the two ends of the sampling container to seal the end of the sampling container.

[0009] A placing rack is arranged between the lifting structure and the sampling container, and the side wall of the placing rack is provided with a placing groove for placing the sampling container, and the top is slidingly provided with a connecting ring for connecting the lifting structure.

[0010] An opening and closing structure is arranged at the side of the placing groove to control the sealing state of the sealing structure, and the opening and closing structure is connected with the connecting ring through a quick release structure; when the sampling container is inserted into the placing groove, the opening and closing structure moves the sealing plug in the sealing structure away from the two ends of the sampling container to open the two ends of the sampling container.

[0011] A buckle seat is fixedly arranged at the bottom of the placing rack.

[0012] A connecting part is arranged below the placing rack, and the top is provided with a connecting buckle and the bottom is provided with a connecting piece; the connecting piece can be assembled with the connecting ring; the connecting buckle is buckled with the buckle seat, so that the connecting part is installed at the bottom of the buckle seat.

[0013] A connecting rope is connected with the connecting part and the placing rack at both ends.

[0014] A release piece is slidingly arranged in the connecting part to release the buckle of the connecting buckle and the buckle seat.

[0015] A pressure measuring part is installed on the side wall of the connecting part to drive the release piece to rise according to the pressure outside the connecting part; when the connecting part reaches a specified depth, the release piece releases the buckle of the connecting buckle and the buckle seat.

[0016] As a further scheme of the application, each of the sealing structures comprises:

[0017] An assembly piece is threadedly connected at the end of the sampling container.

[0018] A sealing plug is slidingly arranged with the assembly piece.

[0019] A sealing spring is arranged between the sealing plug and the assembly piece at both ends.

[0020] A synchronization key is fixedly arranged on the side wall of the sealing plug.

[0021] As a further scheme of the application, the placing groove is provided with an assembly groove at both sides, and the opening and closing structure comprises:

[0022] An opening spring is arranged in the assembly groove, and the fixed end of the opening spring is fixedly arranged with the placing rack and the movable end is attached to the inner wall of the assembly groove.

[0023] The position piece is slidably arranged in the placing rack and is located at both sides of the placing groove, and the end of the position piece can extend into the assembly groove and is flush with the fixed end of the opening spring, so as to limit the reset of the sealing plug by the synchronization key;

[0024] The wedge-shaped piece is fixedly arranged on the side wall of the position piece.

[0025] The transmission piece is slidably arranged in the placing rack and is connected with the connecting ring through the quick release structure, the end part of the transmission piece extends into the wedge-shaped piece, and the wedge-shaped piece can drive the position piece to be separated from the assembly groove and release the restriction on the synchronization key, so that the sealing plug seals the sampling container.

[0026] As a further scheme of the present application, the placing rack is provided with a delay structure for delaying the starting time of the opening and closing structure, and the delay structure comprises:

[0027] The delay cavity is arranged in the placing rack, and a tapered hole is arranged at the bottom of the delay cavity.

[0028] The delay sliding ring is slidably arranged in the delay cavity, and a connecting rod is fixedly arranged on the delay sliding ring, and the connecting rod penetrates through the delay cavity and is fixedly arranged with the transmission piece.

[0029] The trigger plate is elastically and slidably arranged at the bottom of the placing rack, and the trigger plate is fixedly arranged with a flow control plug for blocking the tapered hole.

[0030] When the connecting part is mounted at the bottom of the buckling seat, the bottom of the trigger plate is pressed by the connecting part, so that the flow control plug blocks the tapered hole.

[0031] As a further scheme of the present application, the connecting part is provided with a tripping cavity, and the tripping piece comprises:

[0032] The tripping top ring is slidably arranged at the top of the connecting part through a sliding rod.

[0033] The tripping sliding ring is slidably arranged in the tripping cavity, and is used for lifting the tripping top ring to make the connecting buckle separate from the buckling seat.

[0034] The ejection structure is arranged between the tripping sliding ring and the tripping top ring.

[0035] As a further scheme of the present application, the ejection structure comprises:

[0036] The ejection sliding ring is slidably arranged in the tripping cavity and is provided with an elastic piece between the tripping sliding ring and the tripping top ring.

[0037] The force storage buckle is rotatably arranged in the tripping cavity, and the side wall of the force storage buckle is provided with a force storage part and a trigger part, the force storage part is a triangular structure, and the trigger part is provided with an inclined end surface.

[0038] A trigger is arranged on the tripping sliding ring, and a trigger end is arranged on the top of the trigger and matched with the inclined section.

[0039] As a further scheme of the present application, the pressure measuring part is a pressure measuring air bag, which is communicated with the tripping cavity.

[0040] As a further scheme of the present application, the lifting structure comprises a lifting rope, and a hollow bolt is fixedly arranged at the end of the lifting rope and screwed on the adapter ring.

[0041] As a further scheme of the present application, the quick release structure comprises a fixed rod fixedly arranged on the transmission part, the fixed rod is arranged through the placing rack, the adapter ring is fixedly arranged with a support, and the support is quickly disassembled with the fixed rod through a nut.

[0042] Compared with the prior art, the present application has the following beneficial effects:

[0043] 1. In the present application, when the rapid screening is performed, the placing rack and the sampling container in the open state are uniformly lowered to the target depth by the lifting structure. When the sampling container reaches the specified depth of the specified monitoring well, the placing rack and the sampling container are lifted upward by the lifting structure, and the opening and closing structure switches the sealing state of the sealing structure again, that is, the sealing plug is advanced to the closed position, and the two ends of the sampling container are sealed, so that part of the water sample is retained in the sampling container, rapid sampling is realized, the whole sampling process is relatively simple, sampling can be completed through the upward and downward movement of the lifting structure and the automatic switching of the opening and closing structure, and the present application is suitable for use in the case of rapid acquisition of a large amount of water sample in regional groundwater survey, and can effectively shorten the single-well sampling time.

[0044] 2. In the present application, when the multi-layer fine sampling is performed, the multiple sampling devices are cascaded through the longitudinal assembly of the adapter buckle and the buckle seat, and the whole device is uniformly lowered into the detection well by the lifting structure; the mechanical connection between the adapter buckle and the buckle seat is released by the tripping part, so that the placing rack is separated from the adapter part, and the adapter part is sequentially triggered to separate at each target depth; after all the placing racks are in place, the opening and closing structure synchronously drives each layer of the sealing structure, so that the two ends of the sampling container at the corresponding depth are sealed, and cross contamination of the water samples in each layer is avoided; the device is taken out in stages by the lifting structure, the layered sampling is completed, the vertical distribution characteristics of the pollutants are accurately captured, the demand for high-precision data in pollution tracing and risk assessment is met, and the problem of over-sampling and under-sampling is avoided through the two-stage strategy of coarse screening and fine checking. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0046] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0047] Figure 2 It is a schematic diagram of the overall structure of the present application. Figure 1

[0048] Figure 3 It is a schematic diagram of the overall structure of the present application.

[0049] Figure 4 It is a schematic diagram of the overall structure of the present application. Figure 3

[0050] Figure 5 It is a schematic diagram of the overall structure of the present application.

[0051] Figure 6 It is a schematic diagram of the overall structure of the present application. Figure 5

[0052] Figure 7 It is a schematic diagram of the overall structure of the present application.

[0053] Figure 8 It is a schematic diagram of the overall structure of the present application.

[0054] Figure 9 It is a schematic diagram of the overall structure of the present application.

[0055] Figure 10 It is a schematic diagram of the overall structure of the present application.

[0056] In the drawings, the components represented by each reference numeral are listed as follows:

[0057] ​​​1, rack; 11, placement groove; 12, adapter ring; 13, sampling container; 14, buckle seat; 2, sealing structure; 21, assembly; 22, sealing plug; 23, sealing spring; 24, synchronization key; 3, opening and closing structure; 31, assembly groove; 32, opening spring; 33, spacer; 34, wedge; 35, transmission part; 4, delay structure; 41, delay cavity; 42, tapered hole; 43, delay sliding ring; 44, connecting rod; 45, trigger plate; 46, flow control plug; 5, adapter; 51, adapter buckle; 52, adapter; 53, adapter rope; 54, pressure measuring part; 6, tripping part; 61, tripping cavity; 62, tripping top ring; 63, tripping sliding ring; 7, ejection structure; 71, ejection sliding ring; 72, elastic part; 73, force storage buckle; 74, force storage part; 75, trigger part; 76, trigger; 77, trigger end. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0059] Please refer to Figures 1-10 The present application provides a technical solution: a sampling device for monitoring the quality of underground water, comprising a lifting structure and a sampling container 13, further comprising:

[0060] A sealing structure 2 is arranged at the opening side of the two ends of the sampling container 13, and the sealing structure 2 is used to seal the end of the sampling container 13;

[0061] A rack 1 is arranged between the lifting structure and the sampling container 13, the side wall of the rack 1 is provided with a placement groove 11 for placing the sampling container 13, and the top is slidingly provided with an adapter ring 12 for connecting the lifting structure;

[0062] An opening and closing structure 3 is arranged at the side of the placement groove 11, and the opening and closing structure 3 is connected with the adapter 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;

[0063] When the sampling container 13 is loaded into the placement groove 11, the opening and closing structure 3 moves the sealing plug 22 in the sealing structure 2 away from the two ends of the sampling container 13, so that the two ends of the sampling container 13 are opened; during rough sampling, the adapter ring 12 is moved relative to the rack 1 by the lifting structure, and the opening and closing structure 3 is actively triggered to release the restriction on the sealing structure 2, so that the sealing structure 2 seals the two ends of the sampling container 13;

[0064] A buckle seat 14 is fixedly arranged at the bottom of the rack 1;

[0065] The adapter 5 is arranged below the rack 1, and the adapter 5 is provided with an adapter buckle 51 at the top and an adapter piece 52 at the bottom. The adapter piece 52 can be assembled with the adapter ring 12. The adapter buckle 51 is buckled with the buckle seat 14, so that the adapter 5 is installed at the bottom of the buckle seat 14.

[0066] The adapter rope 53 is arranged between the adapter 5 and the rack 1.

[0067] The tripping piece 6 is slidingly arranged in the adapter 5, and the tripping piece 6 is used to release the buckling of the adapter buckle 51 and the buckle seat 14, so that the adapter 5 is separated from the rack 1.

[0068] The pressure measuring part 54 is installed on the side wall of the adapter 5, and the pressure measuring part 54 is used to drive the tripping piece 6 to rise by a distance according to the pressure outside the adapter 5. When the adapter 5 reaches a specified depth, the tripping piece 6 releases the buckling of the adapter buckle 51 and the buckle seat 14.

[0069] The rough sampling mode (i.e. rapid screening) is as follows:

[0070] The pretreatment stage: the mechanical connection between the adapter 5 and the rack 1 is released, that is, the adapter buckle 51 is released from the buckle seat 14, and the adapter rope 53 between the adapter 5 and the rack 1 is removed. The sampling container 13 is horizontally inserted into the placing groove 11, and the sealing state of the sealing structure 2 is switched by the opening and closing structure 3, that is, the sealing plug 22 retreats (away from the sampling container 13) to the opening position, and the two ends of the sampling container 13 are opened.

[0071] The sampling stage: the rack 1 and the sampling container 13 in the opening state are uniformly lowered to the target depth by the lifting structure. When the sampling container 13 reaches the specified depth of the monitoring well, the rack 1 and the sampling container 13 are lifted upward by the lifting structure, and the sealing state of the sealing structure 2 is switched again by the opening and closing structure 3, that is, the sealing plug 22 advances (close to the sampling container 13) to the closed position, and the two ends of the sampling container 13 are sealed, so that part of the water sample stays in the sampling container 13. After the sampling container 13 is taken out of the monitoring well, it is taken off from the placing groove 11, that is, the rough sampling is completed. Then, the water sample is sent for detection, and the detection result is waited.

[0072] When the detection result is abnormal and further fine sampling (i.e. stratified sampling) is needed, the specific steps are as follows:

[0073] The pretreatment stage: according to the depth (H) of the monitoring well, the number N of devices required is calculated, N=H / 10m (integer+1), the adapter 5 and the rack 1 on the same sampling device are buckled and assembled through the adapter buckle 51 and the buckle seat 14, and then the sampling devices are longitudinally connected in series.

[0074] Separation stage: the assembled sampling device is put into the detection well through the lifting structure. With the increase of the depth of the sampling device, the water pressure increases gradually. When the adapter 5 in the top sampling device reaches the specified depth, the lifting structure stops descending. At this time, the water pressure reaches the trigger condition of the pressure measuring part 54, and the pressure measuring part 54 releases the buckling of the adapter buckle 51 and the buckle seat 14 through the release part 6, so that the adapter buckle 51 and the buckle seat 14 are separated. The first placement rack 1 stops descending, and the first adapter 5 continues to descend with the remaining sampling devices under the action of gravity; when the adapter rope 53 at the bottom of the first placement rack 1 is straight (the length of the adapter rope 53 is determined according to the required interval), the first adapter 5 stops descending. At this time, the pressure measuring part 54 outside the adapter 5 on the second sampling device reaches the trigger condition, so that the second adapter 5 and the second placement rack 1 are separated, and so on, until the lowermost placement rack 1 reaches the specified depth.

[0075] Sampling stage: after waiting for the water fluctuation in the detection well to stop, the opening and closing structure 3 seals both ends of the sampling container 13 at the same depth through the sealing structure 2. After all the sampling containers 13 are sealed, the sampling device is taken out of the detection well through the lifting structure, and the sampling container 13 is taken off and sent for inspection again.

[0076] In summary, in rapid screening, the placement rack 1 is quickly put into the detection well to the specified depth through the lifting structure, and then the placement rack 1 is taken out of the detection well through the lifting structure. When the lifting structure is lifted, the sampling container 13 is sealed at both ends through the rapid sealing switching of the opening and closing structure 3, so as to shorten the single well sampling time and meet the needs of rapid screening in regional groundwater survey; in stratified sampling, based on the linkage mechanism of the pressure measuring part 54 and the release part 6 triggered by water pressure, the interval between the sampling devices is adjusted, and the groundwater at different depths is sampled, which can be automatically separated and sealed synchronously, the water sample is vertically distributed, and the pollution details caused by traditional unified sampling are avoided.

[0077] When the multi-layer fine sampling is performed, the plurality of sampling devices are cascaded through the longitudinal assembly of the connection buckle 51 and the buckle seat 14, the whole device is uniformly lowered into the detection well by using the lifting structure; when the connection part 5 of the first sampling device reaches the first target depth, the water pressure triggers the pressure measuring part 54, the mechanical connection between the connection buckle 51 and the buckle seat 14 is released through the tripping part 6, and the first layer placing rack 1 stops descending; the connection part 5 continues to dive with the device, and the subsequent connection parts 5 trigger the separation (the sampling interval is between 5m-10m) at each target depth in turn; after all the placing racks 1 are in place, the opening and closing structure 3 synchronously drives each layer of the sealing structure 2, so that the sampling container 13 at the corresponding depth is sealed at both ends, and cross contamination of water samples in each layer is avoided; the device is taken out in stages through the lifting structure, the stratified sampling is completed, the vertical distribution characteristics of the pollutants are accurately captured, and the demand for high-precision data for pollution tracing and risk assessment is met; through the two-stage strategy of rough screening first and fine checking later, the fast mode is used for the non-polluted or low-risk monitoring well, and the fine mode is started for the abnormal well, so that the problem of over-sampling and insufficient sampling is avoided.

[0078] In addition, during the disengagement process, the sampler is sequentially disengaged when reaching the specified depth. The disturbance caused by each disengagement action is relatively small, and since the samplers are disengaged one by one and stay at different depths, the influence of the samplers that have already disengaged on the water flow gradually subsides when the subsequent samplers disengage, avoiding the superposition of disturbances.

[0079] As a further scheme of the present application, each sealing structure 2 comprises:

[0080] The assembly part 21 is threadedly connected to the end of the sampling container 13;

[0081] The sealing plug 22 is slidingly arranged with the assembly part 21;

[0082] The sealing spring 23 is arranged between the sealing plug 22 and the assembly part 21 at both ends;

[0083] The synchronization key 24 is fixedly arranged on the side wall of the sealing plug 22;

[0084] Specifically, referring to Figure 1 , Figure 2 and 8 , before use, the sealing structure 2 is assembled at both ends of the sampling container 13 through the assembly part 21; the assembly part 21 is threadedly connected with the sampling container 13, and the connection needs to be sealed;

[0085] When the sampling container 13 is inserted into the placing groove 11, the opening and closing structure 3 drives the synchronization key 24 away from the sampling container 13, thereby driving the sealing plug 22 away from the end of the sampling container 13, so that the end of the sampling container 13 is opened;

[0086] Meanwhile, the sealing plug 22 is stretched by the sealing spring 23, and after the opening and closing structure 3 removes the restriction on the synchronization key 24, the sealing spring 23 quickly resets the sealing plug 22 to reseal the end of the sampling container 13, and the sampling is completed.

[0087] As a further scheme of the present application, the placing groove 11 is provided with an assembly groove 31 on both sides, and the opening and closing structure 3 comprises:

[0088] An opening spring 32 is arranged in the assembly groove 31, and the fixed end of the opening spring 32 is fixed to the placing rack 1 and the movable end is attached to the inner wall of the assembly groove 31;

[0089] A giving-in piece 33 is slidingly arranged in the placing rack 1 and located on both sides of the placing groove 11, and the end of the giving-in piece 33 can extend into the assembly groove 31 and be flush with the fixed end of the opening spring 32, so as to restrict the resetting of the sealing plug 22 through the synchronization key 24;

[0090] A wedge-shaped piece 34 is fixed to the side wall of the giving-in piece 33;

[0091] A transmission piece 35 is slidingly arranged in the placing rack 1 and connected to the link ring 12 through the quick release structure, and the end branch of the transmission piece 35 extends into the wedge-shaped piece 34 and can drive the giving-in piece 33 to move out of the assembly groove 31 through the wedge-shaped piece 34, so as to remove the restriction on the synchronization key 24 and seal the sampling container 13 through the sealing plug 22;

[0092] Specifically, referring to Figures 1-3 When the sampling container 13 is loaded into the placing groove 11, the synchronization key 24 will enter the assembly groove 31 synchronously and be guided by the opening spring 32, and the synchronization key 24 drives the sealing plug 22 to move away from the sampling container 13, so as to switch the sealing state of the sealing structure 2 and make the two ends of the sampling container 13 in an open state for sampling operation;

[0093] During the rapid screening, the lifting and pulling structure link ring 12 can be lifted (moved upward relative to the placing rack 1), and the transmission piece 35 is lifted synchronously, thereby pressing the wedge-shaped piece 34, and under the driving force of the wedge-shaped piece 34, the end of the giving-in piece 33 moves out of the assembly groove 31, thereby removing the restriction on the synchronization key 24, and at this time, the synchronization key 24 is reset under the action of the sealing spring 23, so as to seal the two ends of the sampling container 13.

[0094] When the sampling container 13 is taken out, the synchronization key 24 and the sealing plug 22 will move in the horizontal direction. During the movement of the synchronization key 24, the movable end of the opening spring 32 is pushed to gradually move out of the assembly groove 31 until the synchronization key 24 passes through the gap between the opening spring 32 and the assembly groove 31. Then, the opening spring 32 is automatically reset. During this process, the synchronization key 24 always maintains the same horizontal height, ensuring that the two ends of the sampling container 13 are continuously sealed, effectively preventing the sample from leaking out.

[0095] As a further scheme of the present application, the placing rack 1 is provided with a delay structure 4 for delaying the starting time of the opening and closing structure 3, the delay structure 4 comprises:

[0096] A delay cavity 41 is opened in the placing rack 1, and a tapered hole 42 is opened in the bottom of the delay cavity 41;

[0097] A delay sliding ring 43 is slidingly arranged in the delay cavity 41, and a connecting rod 44 is fixedly arranged on the delay sliding ring 43, and the top of the connecting rod 44 penetrates the delay cavity 41 and is fixedly arranged with the transmission member 35;

[0098] A trigger plate 45 is elastically slidingly arranged at the bottom of the placing rack 1, and the trigger plate 45 is fixedly arranged with a flow control plug 46 for blocking the tapered hole 42;

[0099] When the engaging part 5 is installed at the bottom of the buckling seat 14, the bottom of the trigger plate 45 is pressed by the engaging part 5, so that the flow control plug 46 blocks the tapered hole 42;

[0100] Referring to Figure 3 and Figure 4 In the stratified sampling process, when the engaging part 5 is separated from the placing rack 1, the trigger plate 45 moves downward relative to the placing rack 1, and simultaneously drives the flow control plug 46 away from the tapered hole 42, a gap is generated between the two, and the water in the detection well enters the delay cavity 41 through the tapered hole 42, and as the water level in the delay cavity 41 rises, the delay sliding ring 43 gradually rises, and the delay sliding ring 43 drives the transmission member 35 to rise through the connecting rod 44, so that the displacement member 33 is displaced and the restriction on the synchronization key 24 is released, thereby delaying the sealing time of the sealing structure 2 triggered by the opening and closing structure 3 in the stratified sampling process, so that the water in the detection well has enough time to precipitate, and the error caused by the disturbance of the water sample is reduced.

[0101] As a further scheme of the present application, the engaging part 5 is provided with a tripping cavity 61, and the tripping part 6 comprises:

[0102] A tripping top ring 62 is slidingly arranged at the top of the engaging part 5 through a sliding rod;

[0103] A tripping sliding ring 63 is slidingly arranged in the tripping cavity 61, and is used for lifting the tripping top ring 62 to make the engaging buckle 51 separate from the buckling seat 14;

[0104] A shooting structure 7 is arranged between the tripping sliding ring 63 and the tripping top ring 62;

[0105] As a further scheme of the present application, the shooting structure 7 comprises:

[0106] A shooting sliding ring 71 is slidingly arranged in the tripping cavity 61, and an elastic member 72 is arranged between the shooting sliding ring 71 and the tripping sliding ring 63;

[0107] The force storage buckle 73 is arranged in the tripping cavity 61 and has a force storage portion 74 and a trigger portion 75 arranged on the side wall of the force storage buckle 73, wherein the force storage portion 74 is triangular in shape, and the trigger portion 75 is provided with an inclined end face;

[0108] The trigger piece 76 is fixed to the tripping sliding ring 63 and has a trigger end 77 arranged on the top of the trigger piece 76 and matched with the inclined segment;

[0109] As a further scheme of the present application, the pressure measuring portion 54 is a pressure measuring air bag which is communicated with the tripping cavity 61;

[0110] Specifically, referring to Figure 5 When the adapter 5 is deep into the detection well along with the whole device, the water pressure (P) in the well linearly increases with the depth (H) (P=ρgH, ρ is the density of the water body, and g is the acceleration of gravity), and the water pressure outside the adapter 5 is transmitted to the pressure bearing cavity of the pressure measuring portion 54; the inert gas (the gas filling amount decreases from top to bottom, and the gas filling amount controls the disengagement time and the required pressure of the adapter 5) pre-charged in the pressure bearing cavity is compressed under pressure (the compression amount ΔV=V0×(1-P0 / P), V0 is the initial volume, and P0 is the initial pressure), and the gas is pressed into the tripping cavity 61, so that the air pressure in the tripping cavity 61 gradually increases.

[0111] The high-pressure gas in the tripping cavity 61 acts on the bottom of the tripping sliding ring 63 to generate an upward thrust, which overcomes the static friction between the tripping sliding ring 63 and the inner wall of the tripping cavity 61 and pushes the tripping sliding ring 63 to rise; the tripping sliding ring 63 transmits power to the ejection sliding ring 71 through the elastic member 72 to drive the ejection sliding ring 71 to rise synchronously.

[0112] At this time, the force storage portion 74 (wedge-shaped structure) of the force storage buckle 73 limits the top of the ejection sliding ring 71 from rising, forms mechanical limiting, and prevents the ejection sliding ring 71 from continuing to rise; as the tripping sliding ring 63 continuously rises, the elastic member 72 is further compressed, and the stored elastic potential energy gradually increases; at the same time, the trigger piece 76 (rigidly connected with the tripping sliding ring 63) rises synchronously with the tripping sliding ring 63, and the trigger end 77 of the trigger piece 76 gradually approaches the trigger portion 75 of the force storage buckle 73.

[0113] When the trigger end 77 contacts the trigger part 75, the trigger end 77 exerts a horizontal component of force on the trigger part 75, driving the force storage buckle 73 to rotate around the hinge point of the force storage buckle 73; after the force storage buckle 73 is deflected, the force storage part 74 is disengaged from the limit on the upper surface of the ejection sliding ring 71, and the mechanical constraint on the ejection sliding ring 71 is released; at this time, the elastic member 72 releases the stored elastic potential energy, driving the ejection sliding ring to be ejected instantaneously, and the ejection sliding ring 71 exerts an impact force on the engagement buckle 51 through the decoupling top ring 62, causing the elastic clamping jaw of the engagement buckle 51 to be elastically deformed and then disengaged from the clamping groove of the clamping seat 14; after the engagement part 5 loses the mechanical connection, it freely falls under the action of gravity (the falling distance is set according to the target depth), realizing the precise separation of the engagement part 5 from the placing rack 1.

[0114] As a further scheme of the present application, the lifting structure comprises a lifting rope, and a hollow bolt is fixedly installed at an end of the lifting rope, and the hollow bolt is threadedly connected to the engagement ring 12.

[0115] Specifically, as shown in Figure 1 and Figure 3 the hollow bolt can be threadedly connected to the engagement ring 12, so that the assembly and disassembly of the lifting structure and the placing rack 1 are rapidly completed, greatly facilitating the maintenance and care of the sampling device and the longitudinal series connection.

[0116] As a further scheme of the present application, the quick-release structure comprises a fixed rod fixedly arranged with the transmission member 35, the fixed rod penetrates the placing rack 1, the engagement ring 12 is fixedly arranged with a bracket, and the bracket and the fixed rod are quickly assembled and disassembled through a nut; the transmission member 35 and the engagement ring 12 can be quickly connected through the nut, facilitating the triggering of the sealing structure 2 in the rapid screening process and realizing the 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); Each of the sealing structures (2) includes an assembly (21), a sealing plug (22), and a synchronization key (24). A 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 a connecting ring (12) for connecting the lifting structure is slidably provided on the top; an assembly groove (31) is provided on both sides of the placement groove (11). 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 a 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); 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).

2. A sampling device for groundwater quality monitoring according to claim 1, characterized in that: The fitting (21) is threaded to the end of the sampling container (13); the sealing plug (22) is slidably disposed with the fitting (21); the synchronization key (24) is fixed to the side wall of the sealing plug (22); Each of the sealing structures (2) further includes a sealing spring (23), the two ends of which are respectively disposed between the sealing plug (22) and the assembly (21).

3. A sampling device for groundwater quality monitoring according to claim 1, 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).

4. 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).

5. A sampling device for groundwater quality monitoring according to claim 4, 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.

6. 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).

7. 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).

8. A sampling device for groundwater quality monitoring according to claim 1, 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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