Underground water in-situ stratified sampling device and self-adaptive sampling method

Abstract

The invention discloses an underground water in-situ stratified sampling device and a self-adaptive sampling method, and relates to the technical field of water taking devices. The underground water in-situ stratified sampling device comprises a supporting frame and further comprises at least two sets of sampling barrels longitudinally arranged in the supporting frame, and water inlet pipes are arranged on the upper surfaces of the sampling barrels; and the primary plugging mechanism is arranged in the sampling barrel, a water separation block is mounted on the primary plugging mechanism, and when sampling of the single sampling barrel is completed, the water separation block is mounted on the primary plugging mechanism. By arranging the sampling barrel, the primary plugging mechanism, the water retaining sleeve, the first pressing block and the rotating shaft, when single sampling is completed, the primary plugging mechanism can perform primary plugging on the water inlet pipe, and the rotating shaft rotates by a certain angle, so that the water retaining sleeve can perform secondary plugging on the water inlet pipe, and meanwhile, the first pressing block acts; and the blocking effect of the primary blocking mechanism on the water inlet pipe is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water taking devices, in particular to an in-situ layered groundwater sampling device and a self-adaptive sampling method. BACKGROUND

[0002] In-situ layered groundwater sampling is aimed at groundwater, and under the premise of not disturbing the original state of the water body or sediments, water samples or sediment samples at different levels are collected according to the vertical depth to accurately reflect the vertical distribution of pollutants, water quality parameters or medium characteristics.

[0003] In the prior art, during the lifting process of the water taking device, the water sample is easily mixed with the upper layer water. Therefore, a layered water pumping sampling device for hydrological water resource investigation is disclosed in the patent with publication number CN114964919A, which realizes the closure of the water storage cavity by setting a row plate, thereby avoiding the mixing of water at different depths. However, the row plate has limited plugging effect, and after the sampling of a single sampling barrel is completed, the device needs to be moved to other heights, and the force and inertia of water will affect the stability of the row plate plugging. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides an in-situ layered groundwater sampling device and a self-adaptive sampling method, which solves the problem of mixing of water at different depths during layered water taking.

[0005] To achieve the above purpose, the following technical solutions are used: an in-situ layered groundwater sampling device and a self-adaptive sampling method, comprising a support frame, further comprising: a sampling barrel, at least two groups of sampling barrels are arranged longitudinally inside the support frame, and the upper surface of the sampling barrel is provided with a water inlet pipe; a primary plugging mechanism, which is arranged inside the sampling barrel and is provided with a water stop block, when the sampling of a single sampling barrel is completed, the buoyancy in the sampling barrel can push the water stop block to plug the water inlet pipe; a water blocking sleeve, which can move to plug or unplug the water inlet pipe; a first pressing block, which can move horizontally to apply or not apply pressure to the water stop block; a rotating shaft, which rotates at different angles to drive different water blocking sleeves and first pressing blocks to move.

[0006] Further, the water inlet pipe has an L-shaped structure, one end of the water inlet pipe is located above one side of the sampling barrel; the water blocking sleeve has a circular through hole structure, a rotating cylinder is arranged in the water blocking sleeve, the rotating cylinder is concentric with the rotating shaft and is fixed thereto; The outer arc surface of the rotating drum is provided with a groove structure, the groove structure includes a first inclined groove, a second inclined groove and an arc-shaped groove, the first inclined groove and the second inclined groove are connected to form a V-shaped structure, the opening end of the V-shaped structure is located at the upper part of the rotating drum and is communicated with the arc-shaped groove, and the inner wall of the water baffle sleeve is provided with a sliding block on the side close to the sampling barrel.

[0007] Further, the groove structure angles on the rotating drum corresponding to different sampling barrels are different, so that when the rotating shaft is rotated to the required angle, the sliding block on one of the water baffles is located in the V-shaped structure, indicating that one of the water baffles is in a state of not blocking the water inlet pipe.

[0008] Further, the side of the water baffle away from the sampling barrel is provided with an integral ear plate, a second guide shaft is fixed on the support frame, and the second guide shaft penetrates through the ear plate.

[0009] Further, a cam is mounted on the region of the rotating shaft opposite to the first pressing block, and a force receiving assembly is arranged between the cam and the first pressing block. The force receiving assembly includes a moving rod, the moving rod is located between the cam and the sampling barrel, a second spring is sleeved on the outer surface of the moving rod, a second guide frame is arranged on the support frame, one end of the moving rod close to the cam is slidably connected with the second guide frame, and the other end of the moving rod close to the sampling barrel extends into the sampling barrel and is fixed with the first pressing block. The cam sector angle radian of different sampling barrels is different.

[0010] Further, the primary blocking mechanism includes: a floating plate, the floating plate is located in the center of the sampling barrel, a second connecting rod is hingedly connected to the upper surface of the floating plate, and the other end of the second connecting rod is hingedly connected with the water stop block; a first guide shaft, the first guide shaft penetrates through the middle part of the floating plate, the first guide shaft and the floating plate are gap-fitted, a mounting for supporting the first guide shaft is arranged on the inner wall of the sampling barrel, and a first spring is arranged on the outer arc surface of the lower part of the floating plate.

[0011] Further, a cam is arranged on the position of the rotating shaft corresponding to the maximum height of the floating plate, and a force receiving assembly is arranged between the cam and the lower side of the floating plate, and one end of the force receiving assembly located in the sampling barrel is provided with a pressing member.

[0012] Further, the pressing member includes four first connecting rods, the first connecting rods are hingedly connected through pins to form a parallelogram, a second pressing block is fixed on the two pins on the same straight line between the parallelogram and the moving rod, first guide frames are arranged on the four sides of the inner wall of the sampling barrel, and the lower ends of the pins are slidably connected with the first guide frames.

[0013] Further, the inner wall of the sampling barrel is provided with a pressure sensor near the water inlet pipe and opposite to the position of the water stop block, the upper end of the support frame is provided with a motor, the power output end of the motor is fixedly connected with one end of the rotating shaft, and the pressure sensor is electrically connected with the motor.

[0014] Further, step one: the in-situ layered groundwater sampling device is placed in the groundwater, and the lowest sampling barrel reaches the required water depth, the motor is started to drive the rotating shaft to rotate by a first angle, the water inlet pipe corresponding to the lowest sampling barrel is opened, and water starts to flow in; Step two: after the water inlet pipe of the sampling barrel is closed by the water stop block, the pressure sensor controls the motor to rotate to the required angle, the motor drives the rotating shaft to control the water stop sleeve corresponding to the sampling barrel to close the water inlet pipe again, and the first pressing block applies pressure to the water stop block for three times of closing; Step three: the in-situ layered groundwater sampling device is moved to another water depth corresponding to the next lower sampling barrel, the motor is started to drive the rotating shaft to rotate by a second angle, the water inlet pipe corresponding to the next lower sampling barrel is opened, and water starts to flow in; Step four: repeat steps two and three until all sampling barrels are sampled at the required height.

[0015] The present application has the following advantages: 1. The in-situ layered groundwater sampling device and the adaptive sampling method, by setting the sampling barrel, the primary closing mechanism, the water stop sleeve, the first pressing block and the rotating shaft, when a single sampling is completed, the primary closing mechanism can close the water inlet pipe once, and the rotating shaft can rotate by a certain angle to make the water stop sleeve close the water inlet pipe again, and the first pressing block acts to strengthen the closing effect of the primary closing mechanism on the water inlet pipe.

[0016] 2. The in-situ layered groundwater sampling device and the adaptive sampling method, by setting the rotating drum and opening the groove structure with different angles on the rotating drum corresponding to different sampling barrels, the water stop sleeve can be in a state of closing the water inlet pipe or one of the water stop sleeves can be in a state of not closing the water inlet pipe, and the closing or not closing of the water inlet pipe by the water stop sleeve can occur according to actual needs.

[0017] 3. The in-situ layered groundwater sampling device and the adaptive sampling method, by setting the cam, and the cam sector angle radian corresponding to different sampling barrels is different, so that the above-mentioned cam only strengthens the closing effect of the water stop block of the sampling barrel which has completed sampling.

[0018] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the overall view of the present application. Figure 2 is a first perspective view of the sampling barrel of the present application; Figure 3 is a second perspective view of the sampling barrel of the present application; Figure 4 is an enlarged view of area A of Figure 1 ; Figure 5 is a sectional view of the sampling barrel of the first embodiment of the present application; Figure 6 is an enlarged view of area B of Figure 2 ; Figure 7 is an enlarged view of area C of Figure 5 ; Figure 8 is a schematic view of the water blocking sleeve and the water inlet pipe of the present application; Figure 9 is a schematic view of the sampling barrel 3a in the sampling state of the present application; Figure 10 is a schematic view of the sampling barrel 3b in the sampling state of the present application; Figure 11 is a schematic view of the sampling barrel before the sampling starts and after the sampling ends of the present application; Figure 12 is an exploded view of the water blocking sleeve and the rotating shaft of the present application; Figure 13 is an enlarged view of area D of Figure 12 ; Figure 14 is an exploded view of the force receiving assembly of the present application; Figure 15 is a bottom view of the floating plate of the present application; Figure 16 is a sectional view of the sampling barrel of the second embodiment of the present application; Figure 17 is an exploded view of the pressing member of the second embodiment of the present application; Figure 18 is a schematic view of the rotating shaft and the cam connection of the third embodiment of the present application.

[0020] In the figure, 1, support frame; 2, motor; 3, sampling bucket; 31, cleaning port; 32, water inlet pipe; 33, water outlet pipe; 41, first pressing block; 42, second pressing block; 43, first connecting rod; 44, first guide frame; 5, primary plugging mechanism; 51, floating plate; 52, second connecting rod; 53, first guide shaft; 54, first spring; 55, mounting frame; 6, water blocking sleeve; 61, lug plate; 62, sliding block; 7, rotating drum; 71, first inclined chute; 72, second inclined chute; 73, arc-shaped chute; 8, force receiving assembly; 81, second guide frame; 82, moving rod; 83, second spring; 9, cam; 10, rotating shaft; 11, second guide shaft; 12, water blocking block; 13, pressure sensor. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described 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.

[0022] In the description of the present application, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated component or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0023] The underground water in-situ layered sampling device and the adaptive sampling method provided by the embodiments of the present application will be described below according to Figures 1-18 The underground water in-situ layered sampling device and the adaptive sampling method provided by the embodiments of the present application will be described below according to

[0024] In one aspect, the present application provides an underground water in-situ layered sampling device.

[0025] Embodiment one: Please refer to Figures 1-4 The underground water in-situ layered sampling device includes a support frame 1 and a sampling bucket 3 mounted on the support frame 1. The support frame 1 has at least two mounting spaces for mounting two sampling buckets 3. In this embodiment, four mounting spaces are provided, and four sampling buckets 3 are taken as an example. The four sampling buckets 3 are arranged longitudinally inside the support frame 1. The arrangement of the four sampling buckets 3 enables the sampling device to take water at different depths in layers.

[0026] Preferably, a cleaning port 31 is arranged on the outer arc surface of the sampling barrel 3, which can be used to access cleaning liquid to clean the inside of the sampling barrel 3 thoroughly, so as to avoid the pollution of the sample caused by the residual substances of the last sampling, and ensure the purity of the sample and the accuracy of the detection result. The lower end of the sampling barrel 3 is provided with a water outlet pipe 33, which can be used to take out the sample in the sampling barrel 3 after the sampling is completed.

[0027] Preferably, the sampling barrel 3 is in a cylindrical structure, and the lower end is conical, which facilitates complete drainage during the drainage stage.

[0028] Please refer to Figures 5-15 In order to realize the water sampling operation of the sampling barrel 3, the upper surface of the sampling barrel 3 is provided with a water inlet pipe 32, and a small water pump is installed on the water inlet pipe 32. When the water pump is turned on, the sample water enters the sampling barrel 3 through the water inlet pipe 32.

[0029] In order to realize the self-sealing of the water inlet pipe 32 after the sampling barrel 3 completes the sampling at a certain water depth, a one-time sealing mechanism 5 and a water block 12 are arranged. The one-time sealing mechanism 5 is arranged in the inside of the sampling barrel 3, and can move upward along the axial direction of the sampling barrel 3 under the action of the buoyancy of the water, so as to push the water block 12 to the lower end of the water inlet pipe 32, seal the lower end of the water inlet pipe 32, and realize the self-sealing effect.

[0030] Specifically, the one-time sealing mechanism 5 is provided with a floating plate 51, which is located in the center of the inside of the sampling barrel 3. When the sampling water submerges the floating plate 51, the buoyancy will push the floating plate 51 to rise. The upper surface of the floating plate 51 is hinged with a second connecting rod 52, and the other end of the second connecting rod 52 is hinged with the water block 12. The cross section of the water block 12 is in a T-shaped structure, and an integral T-shaped sliding block is arranged on the upper surface thereof. A sliding groove matched with the T-shaped sliding block is arranged on the top surface of the sampling barrel 3. When the floating plate 51 is not subjected to the buoyancy, the water block 12 is located at the end of the sliding groove, and the lower end of the water inlet pipe 32 is not covered by the water block 12. When the water block 12 is moved upward under the action of the buoyancy, it can push the water block 12 through the second connecting rod 52, so that the water block 12 can slide along the sliding groove and reach the lower side of the water inlet pipe 32 to seal the water inlet pipe 32.

[0031] Preferably, a sealing gasket is arranged on the top surface of the water block 12.

[0032] Further, in order to make the floating plate 51 stably lift, and the water-stop block 12 stably slide, the one-time blocking mechanism 5 is further provided with a first guide shaft 53, the first guide shaft 53 is located at the axis of the sampling barrel 3, is fixed in the sampling barrel 3, and passes through the middle of the floating plate 51, the center of the floating plate 51 should be provided with a sleeve ring matched with the first guide shaft 53, preferably the sleeve ring is a metal ring, the floating plate 51 can longitudinally lift along the first guide shaft 53, and cannot move horizontally. It should be noted that the inner diameter of the metal ring is slightly larger than the diameter of the first guide shaft 53, so that the wear of the floating plate 51 and the first guide shaft 53 is avoided when the floating plate 51 lifts.

[0033] In addition, in order to facilitate the installation of the first guide shaft 53, the inner wall of the sampling barrel 3 is provided with a mounting frame 55 supporting the installation of the first guide shaft 53.

[0034] Further, in order to realize the reset of the water-stop block 12, the first guide shaft 53 is located on the outer arc surface of the lower part of the floating plate 51 and is provided with a first spring 54, the upper end of the first spring 54 is fixedly connected with the floating plate 51, in the sampling process, the buoyancy of water is greater than the elastic force of the first spring 54, the first spring 54 will stretch in the lifting process of the floating plate 51, when the buoyancy no longer acts on the floating plate 51, the first spring 54 contracts to generate a pulling force on the floating plate 51, so that the water-stop block 12 moves away from the water inlet pipe 32, and the reset is realized, thereby avoiding that the T-shaped sliding block of the water-stop block 12 is stuck in the sliding groove due to the small gravity of the floating plate 51, and the reset is difficult to realize.

[0035] However, it is not enough to block the water inlet pipe 32 only by the buoyancy of water in the barrel, because after the water inlet in the barrel is finished, the device needs to be salvaged by the staff, in the process, the water pressure outside the barrel changes, in addition, when the sampling depth of the device is changed, the water pressure also changes, and the change of the water pressure is extremely likely to cause the water-stop block 12 to separate from the water inlet pipe 32, so that the water in the barrel and the water outside the barrel are connected through the water inlet pipe 32, and the water samples at different heights are mixed in the sampling process, and the sampling precision is affected.

[0036] Therefore, in the embodiment of the application, the water inlet pipe 32 is arranged in an L-shaped structure, one segment of the L-shaped structure is a horizontal segment, the horizontal segment is located above one side of the sampling barrel 3, and a water-blocking sleeve 6 is arranged on the horizontal segment, in the initial state, the four water-blocking sleeves 6 are all in the state of blocking the water inlet pipe 32, the side, close to the water inlet pipe 32, of the water-blocking sleeve 6 is provided with a plane matched with the water inlet pipe 32, and a sealing layer is fixedly arranged on the plane, when one of the sampling barrels 3 needs to sample, one of the water-blocking sleeves 6 is opened, so that the water-blocking sleeve 6 moves in the vertical direction and separates from the water inlet pipe 32, at this time, the water inlet pipe 32 can inlet water, and vice versa, when the water inlet is finished, the water-blocking sleeve 6 is reset to the state of blocking the water inlet pipe 32, compared with the one-time blocking of the water-stop block 12, the water-blocking sleeve 6 performs two-time blocking on the water inlet pipe 32.

[0037] Preferably, the horizontal section port of the water inlet pipe 32 is provided as an inclined port, and a wedge-shaped structure is provided on the side of the water retaining sleeve 6 close to the water inlet pipe 32 to match the inclined port. When the water retaining sleeve 6 rises, it can press the inclined port of the water inlet pipe 32, so that the water retaining sleeve 6 has a better plugging effect on the water inlet pipe 32.

[0038] In order to realize the opening and closing of each water retaining sleeve 6 as needed, the rotating shaft 10 and the rotating drum 7 are provided. The water retaining sleeve 6 has a circular through hole structure, the rotating drum 7 is located in the circular through hole of the water retaining sleeve 6, the rotating drum 7 is concentric with the rotating shaft 10 and is fixed with each other, the rotation of the rotating drum 7 can be controlled by rotating the rotating shaft 10, the outer arc surface of the rotating drum 7 is provided with a groove structure, the groove structure includes a first inclined groove 71, a second inclined groove 72 and an arc-shaped groove 73, the first inclined groove 71 and the second inclined groove 72 are connected to form a V-shaped structure, the angle point of the V-shaped structure is provided as a buffer horizontal groove to avoid the sliding block 62 being stuck in the angle point of the V-shaped structure when the sliding block 62 slides, the V-shaped structure extension end is located at the upper part of the rotating drum 7 and is communicated with the arc-shaped groove 73, and the inner wall of the water retaining sleeve 6 is provided with a sliding block 62 on the side close to the sampling barrel 3 at the upper part to match the V-shaped structure and the arc-shaped groove 73. When the sliding block 62 slides into the V-shaped structure, the water retaining sleeve 6 will move longitudinally to realize the plugging or unplugging of the water inlet pipe 32, and when the sliding block 62 slides in the arc-shaped groove 73, the water retaining sleeve 6 can stably plug the water inlet pipe 32.

[0039] Please refer to Figure 12 and Figure 13 , in order to realize that the water retaining sleeve 6 can plugging or unplugging the water inlet pipe 32 according to the actual needs of different water inlet pipes 32, the angle direction of the groove structure on the rotating drum 7 corresponding to different sampling barrels 3 is different, so that when the rotating shaft 10 is rotated to the required angle, the sliding block 62 on one of the water retaining sleeves 6 is located in the V-shaped structure, which represents that one of the water retaining sleeves 6 is in the state of unplugging the water inlet pipe 32. That is, by rotating the rotating shaft 10 to drive the rotating drum 7 to rotate to a certain angle, all the water retaining sleeves 6 can be in the state of plugging the water inlet pipe 32 or one of the water retaining sleeves 6 can be in the state of unplugging the water inlet pipe 32.

[0040] Preferably, in order to realize the self-adaptation of the water taking process, the inner wall of the sampling barrel 3 close to the water inlet pipe 32 and opposite to the position of the water retaining block 12 is provided with a pressure sensor 13 (refer to Figure 7 ), the motor 2 is installed on the upper end of the support frame 1, the power output end of the motor 2 is fixedly connected with one end of the rotating shaft 10, and the pressure sensor 13 is electrically connected with the motor 2. When the sampling of a single sampling barrel 3 is completed, the corresponding water retaining block 12 plugs the water inlet pipe 32, and the pressure sensor 13 further sends an electric signal to the motor 2. At this time, the motor 2 drives the rotating shaft 10 to rotate by a certain angle. The motor 2 can be controlled by the pressure sensor 13 or can be controlled by human.

[0041] As Figures 9-11, take the four sampling barrels 3 as an example, respectively, set to sampling barrel 3a, sampling barrel 3b, sampling barrel 3c, sampling barrel 3d, describe the change state of each water baffle 6: Step one: when the device is put into the water, all the water baffles 6 corresponding to the sampling barrels 3 are blocked corresponding to the water inlet pipe 32 (refer to Figure 11 ), in this state, the slider 62 on all the water baffles 6 is located in the arc-shaped groove 73 corresponding to the rotating drum 7; Step two: to the first sampling depth, the lowest one of the sampling barrels 3a first sampling, at this time, control the rotating shaft 10 rotates 36° clockwise (refer to Figure 9 ), so that the rotating drum 7 rotates 36°, the slider 62 of the water baffle 6a slides into the first inclined groove 71 of the rotating drum 7a, and stops at the angle point of the V-shaped structure, in this process, the water baffle 6a descends, no longer blocks the water inlet pipe 32, the water of the first sampling depth enters the sampling barrel 3a through the water inlet pipe 32, while the sliders 62 on the water baffles 6b, 6c and 6d still slide in the arc-shaped groove 73 corresponding to the rotating drum 7, until the sampling water in the sampling barrel 3a rises to the floating plate 51, the water stop 12 blocks the water inlet pipe 32 directly below, the pressure sensor 13 controls the motor 2 to drive the rotating shaft 10 to rotate 36° clockwise again through the controller, so that the slider 62 of the water baffle 6a moves in the second inclined groove 72 of the V-shaped structure, and pushes the water baffle 6a to move upwards, so that it blocks the water inlet pipe 32 on the sampling barrel 3a again, until the slider 62 returns to the arc-shaped groove 73, when the slider 62 of the water baffle 6a moves in the second inclined groove 72 of the V-shaped structure, the sliders 62 on the water baffles 6b, 6c and 6d still slide in the arc-shaped groove 73 corresponding to the rotating drum 7, and when the slider 62 of the water baffle 6a initially enters the arc-shaped groove 73, the sliders 62 on the water baffles 6b, 6c and 6d still slide in the arc-shaped groove 73 corresponding to the rotating drum 7, so that after the sampling of the sampling barrel 3a is completed, the four water inlet pipes 32 can still be kept in the closed state; Step three: after the sampling barrel 3a completes sampling, the device is lifted to the second sampling depth, at this time, the motor 2 continues to drive the rotating shaft 10 to rotate 36° (refer to Figure 10 ), so that the water baffle 6b corresponding to the sampling barrel 3b repeats the action of the water baffle 6a in step two, and the water baffles 6a, 6c and 6d repeat the state of the water baffles 6b, 6c and 6d in step two.

[0042] The opening of the water baffles 6c and 6d is the same as the principle in the above steps, which will not be described here.

[0043] Preferably, please refer to Figure 13In order to realize stable lifting of the water blocking sleeve 6, an integral lug 61 is arranged on the side of the water blocking sleeve 6 away from the sampling barrel 3, and a second guide shaft 11 is fixed on the support frame 1 and penetrates through the lug 61, so that the water blocking sleeve 6 can be lifted along the second guide shaft 11 and will not rotate with the rotating drum 7.

[0044] In order to further ensure the blocking effect of the blocking water inlet pipe 32, the water blocking block 12 is further blocked, and the specific method is as follows: a cam 9 and a force receiving assembly 8 matched with the cam 9 are arranged, a first pressing block 41 matched with the force receiving assembly 8 is arranged in the area opposite to the water blocking block 12, and when the cam 9 rotates, the first pressing block 41 can be pushed to move by the force receiving assembly 8, so that the first pressing block 41 is pressed on the water blocking block 12, thereby ensuring that the water inlet pipe 32 is completely blocked.

[0045] Preferably, the first pressing block 41 is a wedge-shaped block, and the upper surface thereof is a slope, so that the upward pressure can be applied to the water blocking block 12.

[0046] Specifically, the force receiving assembly 8 includes a moving rod 82, the moving rod 82 is located between the cam 9 and the sampling barrel 3, a second spring 83 is sleeved on the outer surface of the moving rod 82, a second guide frame 81 is arranged on the support frame 1, one end of the moving rod 82 close to the cam 9 is slidably connected with the second guide frame 81, and the other end of the moving rod 82 close to the sampling barrel 3 extends into the sampling barrel 3 and is fixed with the first pressing block 41. When sampling of a certain sampling barrel 3 is completed, the corresponding cam 9 of the sampling barrel 3 rotates to push the moving rod 82 to move, the moving rod 82 pushes the first pressing block 41 to move towards the water blocking block 12 to extrude the water blocking block 12. When the cam 9 rotates to an angle that no extrusion force is generated on the moving rod 82, the second spring 83 is stretched to generate a spring force to reset the first pressing block 41, so that the first pressing block 41 no longer extrudes the water blocking block 12.

[0047] In order to make the above-mentioned cam 9 only extrude the water blocking block 12 of the sampling barrel 3 that has completed sampling, the cam 9 corresponding to different sampling barrels 3 has different fan-shaped angular radians, and the extrusion or non-extrusion of the first pressing block 41 is completed through rotation of the rotating shaft 10. The rotating shaft 10 rotates to drive the rotating drum 7 and the cam 9 to rotate synchronously, so that the secondary blocking and the action of the second pressing of the water blocking block 12 on the water inlet pipe 32 are synchronously performed.

[0048] The following still takes the above-mentioned sampling barrel 3a, sampling barrel 3b, sampling barrel 3c and sampling barrel 3d as examples to describe the changing states of the first pressing blocks 41, and the radians of the cams 9 are arranged from bottom to top as 288°, 216°, 144° and 72°.

[0049] Step one: when the device is put into water (refer to Figure 11), all the waterproof blocks 12 are right below the water inlet pipe 32 and are blocked by all the first pressing blocks 41, and all the cams 9 are in the state of pushing the force receiving assembly 8; Step two: reaching the first sampling depth, the lowermost sampling barrel 3a starts sampling first, at this time, the rotating shaft 10 is controlled to rotate clockwise by 36° (refer to Figure 9 ), so that the cam 9 rotates by 36°, at this time, all the recesses on the sampling barrels 3 start to face the force receiving assembly 8, the first pressing block 41 is separated from the lower side of the water inlet pipe 32, at this time, the sampling barrel 3a samples until it is completed, the rotating shaft 10 rotates by 36°, so that all the cams 9 rotate by 36°, but at this time, only the convex part of the cam 9a exerts pressure on the force receiving assembly 8, and then the first pressing block 41 on the sampling barrel 3a extrudes the waterproof block 12, so as to strengthen the blocking effect of the waterproof block 12, at this time, the sampling barrel 3a finishes sampling, and the device is lifted to the second sampling height for secondary sampling; Step three: during the secondary sampling, the motor 2 is driven to rotate by 36°, so that the rotating shaft 10 rotates by 36° (refer to Figure 10 ), so that the cam 9a is still in the state of pushing the force receiving assembly 8, and the recesses of the cams 9b, 9c and 9d are still aligned with the force receiving assembly 8, at this time, the sampling barrel 3b starts sampling, and the sampling barrel 3b starts repeating the action of the sampling barrel 3a, the cam 9b starts pushing the force receiving assembly 8, so that the first pressing block 41 in the sampling barrel 3b presses on the corresponding waterproof block 12 (at this time, the cam 9a is still in the state of pushing the force receiving assembly 8, so that the sampling barrel 3a still maintains sealing).

[0050] The actions of the first pressing blocks 41 on the sampling barrels 3c and 3d are the same as those on the sampling barrels 3a and 3b (refer to Figure 11 ), which will not be repeated here.

[0051] Therefore, by arranging the sampling barrels 3, the one-time blocking mechanism 5, the water blocking sleeve 6, the first pressing blocks 41 and the rotating shaft 10, when a single sampling is completed, the one-time blocking mechanism 5 can block the water inlet pipe 32 once, and the rotating shaft 10 rotating by a certain angle can make the water blocking sleeve 6 block the water inlet pipe 32 twice, and at the same time, the first pressing blocks 41 act, so as to strengthen the blocking effect of the one-time blocking mechanism 5 on the water inlet pipe 32.

[0052] Please refer to Figure 5 , Figure 6 and Figure 14In actual use, when the first pressing block 41 presses the waterproof block 12 upward, it is easy to push the waterproof block 12 horizontally, so that the waterproof block 12 cannot perform waterproofing. The position on the rotating shaft 10 corresponding to the maximum height of the floating plate 51 is also provided with a cam 9, and a force receiving assembly 8 is also arranged between the cam 9 and the lower side of the floating plate 51. One end of the force receiving assembly 8 in the sampling barrel 3 is provided with a pressing part. As above, the cam 9 rotates to push the pressing part through the force receiving assembly 8 to support the floating plate 51.

[0053] Preferably, the pressing part is a pressing block.

[0054] Further, the difference is that the moving rod 82 of the force receiving assembly 8 of the pressing part is longer than the moving rod 82 of the force receiving assembly 8 of the first pressing block 41, so that the pressing part first contacts the floating plate 51 to support it, so as to realize the fixation of the waterproof block 12 in the horizontal direction. The first pressing block 41 then presses and fixes the waterproof block 12, avoiding the situation that when the first pressing block 41 directly fixes the waterproof block 12, the first pressing block 41 pushes the waterproof block 12 to move horizontally, so that the water inlet pipe 32 is exposed, and it is difficult to realize the reinforcing and plugging effect.

[0055] Embodiment two: Please refer to Figure 16 and Figure 17 The difference between this embodiment and embodiment one is that the way of applying pressure to the pressing part is different. Specifically, the pressing part includes four first connecting rods 43, the first connecting rods 43 are hingedly connected through pin shafts to form a parallelogram, and the parallelogram is fixed with a second pressing block 42 on two pin shafts in a straight line with the moving rod 82. The cam 9 rotates and pushes the moving rod 82 through the force receiving assembly 8. The moving rod 82 pushes the second pressing block 42 close to the floating plate 51 to move, the parallelogram formed by the first connecting rods 43 changes the included angle, so that the other second pressing block 42 also moves to the floating plate 51, avoiding the situation that single side pressing and fixing causes the floating plate 51 to tilt, affecting the plugging effect of the waterproof block 12.

[0056] In order to realize the stable change of the included angle of the parallelogram, the first guide frame 44 is arranged at the positions of the four sides of the inner wall of the sampling barrel 3, the lower end of the pin shaft at the intersection of the first connecting rod 43 is provided with a T-shaped sliding block, and the first guide frame 44 is provided with a sliding groove matched with the T-shaped sliding block. The T-shaped sliding block stably slides along the sliding groove, and then the second pressing block 42 stably moves.

[0057] Embodiment three: On the basis of embodiment one, substantially only after the water is taken out, the first pressing block 41 is used to press the water-blocking block 12, to avoid the mutual contact of the water inside and outside the barrel, in the process of putting the device into the water when all the barrels of the device are completely not filled with water, the water-blocking sleeve 6, the water-blocking block 12 and the first pressing block 41 all play a water-blocking role, however, when the sampling barrel 3a starts sampling, substantially all the water-blocking blocks 12 and the first pressing blocks 41 no longer seal, resulting in that the sampling barrel 3b, the sampling barrel 3c and the sampling barrel 3d which have not started sampling only have the water-blocking sleeve 6 to block the water inlet pipe 32, so that there is a possibility of a small amount of water entering under the condition that the sampling barrel 3b, the sampling barrel 3c and the sampling barrel 3d have not started sampling, therefore, the provided embodiment solves the problem.

[0058] Please refer to Figure 18 The difference between the embodiment and embodiment one is that the sector angle radian of the cam 9 is different from that of embodiment one, specifically: The radian of each cam 9 is set to 288°, but the radian of each cam 9 is arranged in different directions from bottom to top, so that when the rotating shaft 10 rotates to the required angle, the recess of one of the cams 9 is directly opposite the force receiving assembly 8, by rotating the rotating shaft 10 to drive the cam 9 to rotate to a certain angle, the protrusions of the cam 9 can be in a state of extruding the force receiving assembly 8 or the recess of one of the cams 9 is directly opposite the force receiving assembly 8 in a state of not extruding, the following describes the change state of each first pressing block 41: Step one: when the device is put into the water, all the water-blocking blocks 12 are below the water inlet pipe 32 to block it, and all the first pressing blocks 41 extrude the water-blocking blocks 12, and all the cams 9 are in a state of pushing the force receiving assembly 8; Step two: when reaching the first sampling depth, the lowermost sampling barrel 3a starts sampling first, at this time, the rotating shaft 10 is controlled to rotate clockwise by 36°, so that the cam 9 rotates by 36°, at this time, the recess of the cam 9a on the sampling barrel 3a starts to be directly opposite the force receiving assembly 8, and the first pressing block 41 is separated from the lower side of the water inlet pipe 32, at this time, the sampling barrel 3a samples until it is completed, while the protrusions of the cams 9b, 9c and 9d still push the first pressing blocks 41 corresponding to the force receiving assembly 8 to extrude the water-blocking blocks 12, the rotating shaft 10 rotates by 36°, so that all the cams 9 rotate by 36°, at this time, the protrusions of the cams 9a, 9b, 9c and 9d all generate pressure on the force receiving assembly 8, and then all the first pressing blocks 41 on the sampling barrels 3 extrude the water-blocking blocks 12, to strengthen the blocking effect of the water-blocking blocks 12, at this time, the sampling of the sampling barrel 3a is completed, and the device is lifted to the second sampling height for secondary sampling; Step three: at the second sampling, re-drive the motor 2 to rotate 36°, make the rotating shaft 10 rotate 36°, so that the cam 9a, the cam 9c, the cam 9d are still in the state of pushing the force receiving assembly 8, the recess of the cam 9b is aligned with the force receiving assembly 8, at this time the sampling barrel 3b starts sampling, and the sampling barrel 3b starts repeating the action of the sampling barrel 3a, the cam 9b starts pushing the force receiving assembly 8, so that the first pressing block 41 in the sampling barrel 3b is pressed on the corresponding waterproof block 12 (at this time the cam 9a, the cam 9c, the cam 9d are still in the state of pushing the force receiving assembly 8, so that the sampling barrel 3a, the sampling barrel 3c, the sampling barrel 3d still keep sealed).

[0059] The action of the first pressing block 41 on the sampling barrels 3c and d is the same as that on the sampling barrels 3a and 3b, which will not be repeated here. After all the sampling barrels 3 finish sampling, the samples are taken out through the water outlet pipe 33. At this time, all the waterproof blocks 12 and the first pressing blocks 41 are located directly below the water inlet pipe 32 for sealing and strengthening the sealing. In the next water inlet use, the primary sealing, the secondary sealing and the strengthened primary sealing actions are maintained, and only when the corresponding sampling barrel 3 is working, the sealing will be opened, and when the corresponding sampling barrel 3 finishes sampling, the sealing will be automatically closed to avoid sample mixing.

[0060] On the other hand, the application also provides a self-adaptive sampling method for in-situ layered sampling of underground water, which comprises the following steps: Step one: place the in-situ layered sampling device for underground water into the underground water, and make the lowest sampling barrel 3 reach the required water depth, start the motor 2 to drive the rotating shaft 10 to rotate by a first angle, so that the water inlet pipe 32 corresponding to the lowest sampling barrel 3 is opened, and the water inlet starts; Step two: after the water inlet pipe 32 is sealed by the waterproof block 12, the pressure sensor 13 controls the motor 2 to rotate by a required angle, the motor 2 drives the rotating shaft 10 to control the water blocking sleeve 6 corresponding to the sampling barrel 3 to seal the water inlet pipe 32 again, and the rotating shaft 10 drives the first pressing block 41 to apply pressure to the waterproof block 12 for three times of sealing; Step three: move the in-situ layered sampling device for underground water to another water depth, which corresponds to the next lowest sampling barrel 3, start the motor 2 to drive the rotating shaft 10 to rotate by a second angle, so that the water inlet pipe 32 corresponding to the next lowest sampling barrel 3 is opened, and the water inlet starts; Step four: repeat steps two and three until all the sampling barrels 3 sample at the required height.

[0061] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other presenters can develop. It is also possible, however, that only a single element can be present. It is further noted that such a term as "comprising" is intended to mean that the embodiments include the recited elements, but not excluding other elements. "Consisting essentially of when used herein in relation to a composition, means that the composition includes the recited elements, and can include additional elements, so long as the additional elements do not materially alter the basic and novel properties of the claimed composition. "Consisting of" when used herein in relation to a composition means that the composition includes the recited elements and nothing more.

[0062] The preferred embodiments of the application disclosed above are only to help explain the principles of the present application. The preferred embodiments do not limit the present application to only the specific embodiments described. It is apparent that many modifications and variations of this application are possible in light of this disclosure. The preferred embodiments are chosen and described in order to best explain the principles of the application and the practical application, to thereby enable others skilled in the art to best utilize the application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. In-situ stratified sampling device for groundwater, comprising a support frame (1), characterized in that, Also include: Sampling barrels (3) are provided with at least two groups and arranged longitudinally inside the support frame (1), and the upper surface of the sampling barrel (3) is provided with a water inlet pipe (32); The primary plugging mechanism (5) is arranged inside the sampling barrel (3), and the primary plugging mechanism (5) is provided with a waterproof block (12). When the sampling of a single sampling barrel (3) is completed, the buoyancy in the sampling barrel (3) can push the waterproof block (12) to plug the water inlet pipe (32) once; The water retaining sleeve (6) can move to plug or not plug the water inlet pipe (32); The first pressing block (41) can move horizontally to apply or not apply pressure to the waterproof block (12); The rotating shaft (10) rotates at different angles to drive different water retaining sleeves (6) and first pressing blocks (41) to act.

2. The groundwater in situ layered sampling device of claim 1, wherein, The water inlet pipe (32) is L-shaped, and one end of the water inlet pipe (32) is located above one side of the sampling barrel (3); The water retaining sleeve (6) has a circular through hole structure, and a rotating cylinder (7) is arranged in the water retaining sleeve (6), the rotating cylinder (7) is concentric with the rotating shaft (10) and is fixed with each other; The outer arc surface of the rotating cylinder (7) is provided with a groove structure, the groove structure includes a first inclined groove (71), a second inclined groove (72) and an arc groove (73), the first inclined groove (71) and the second inclined groove (72) are connected to form a V-shaped structure, the opening end of the V-shaped structure is located at the upper part of the rotating cylinder (7) and is communicated with the arc groove (73), and the upper part of the inner wall of the water retaining sleeve (6) is provided with a sliding block (62) near one side of the sampling barrel (3).

3. The groundwater in situ layered sampling device of claim 2, wherein, The groove structure angles of the rotating cylinders (7) corresponding to different sampling barrels (3) are different, so that when the rotating shaft (10) rotates to the required angle, the sliding block (62) on one of the water retaining sleeves (6) is located in the V-shaped structure, indicating that one of the water retaining sleeves (6) is in a state of not plugging the water inlet pipe (32).

4. The groundwater in situ layered sampling device of claim 3, wherein, One side of the water retaining sleeve (6) away from the sampling barrel (3) is provided with an integral ear plate (61), a second guide shaft (11) is fixed on the support frame (1), and the second guide shaft (11) penetrates through the ear plate (61).

5. The groundwater in situ layered sampling device of any one of claims 1-3, wherein, A cam (9) is installed on the area of the rotating shaft (10) opposite to the first pressing block (41), and a force receiving assembly (8) is arranged between the cam (9) and the first pressing block (41); The force receiving assembly (8) includes a moving rod (82), the moving rod (82) is located between the cam (9) and the sampling barrel (3), a second spring (83) is sleeved on the outer surface of the moving rod (82), a second guide frame (81) is arranged on the support frame (1), one end of the moving rod (82) close to the cam (9) is slidably connected with the second guide frame (81), and the other end of the moving rod (82) close to the sampling barrel (3) extends into the sampling barrel (3) and is fixed with the first pressing block (41); The cam (9) corresponding to different sampling barrels (3) has different sector angle radians.

6. The groundwater in situ layered sampling device of claim 5, wherein, The primary plugging mechanism (5) includes: The floating plate (51) is located in the center of the sampling barrel (3) and is hingedly connected with the second connecting rod (52) on the upper surface of the floating plate (51), and the other end of the second connecting rod (52) is hingedly connected with the waterproof block (12); The first guide shaft (53) passes through the middle of the floating plate (51), and the first guide shaft (53) and the floating plate (51) are gap-fitted, the inner wall of the sampling barrel (3) is provided with a mounting frame (55) for supporting the installation of the first guide shaft (53), and the first guide shaft (53) is provided with the first spring (54) on the outer arc surface of the lower part of the floating plate (51), and the upper end of the first spring (54) is fixedly connected with the floating plate (51).

7. The groundwater in situ layered sampling device of claim 6, wherein, The corresponding position of the rotating shaft (10) after the floating plate (51) floats to the maximum height is also provided with a cam (9), and a force receiving assembly (8) is also arranged between the cam (9) and the lower side of the floating plate (51), and one end of the force receiving assembly (8) located in the sampling barrel (3) is provided with a pressing piece.

8. The groundwater in situ layered sampling device of claim 7, wherein, The pressing piece includes four first connecting rods (43), the first connecting rods (43) are hingedly connected through pin shafts to form a parallelogram, and the parallelogram is fixed with a second pressing block (42) on two pin shafts in a straight line with the moving rod (82), the four sides of the inner wall of the sampling barrel (3) are provided with first guide frames (44), and the lower ends of the pin shafts are slidably connected with the first guide frames (44).

9. The groundwater in situ layered sampling device of claim 1, wherein, The inner wall of the sampling barrel (3) is provided with a pressure sensor (13) on the side close to the water inlet pipe (32) and opposite to the position of the waterproof block (12), the upper end of the support frame (1) is provided with a motor (2), the power output end of the motor (2) is fixedly connected with one end of the rotating shaft (10), and the pressure sensor (13) is electrically connected with the motor (2).

10. An adaptive sampling method for use with the in situ stratified groundwater sampling apparatus of any one of claims 1-9, wherein, The method comprises the following steps: Step one: place the in-situ layered groundwater sampling device into the underground water, and make the lowermost sampling barrel (3) reach the required water depth, start the motor (2) to drive the rotating shaft (10) to rotate by a first angle, open the water inlet pipe (32) corresponding to the lowermost sampling barrel (3), and start to fill water; Step two: after the sampling barrel (3) is filled with water, the waterproof block (12) preliminarily blocks the water inlet pipe (32), at the same time, the pressure sensor (13) controls the motor (2) to rotate by a required angle, the motor (2) drives the rotating shaft (10) to control the water blocking sleeve (6) corresponding to the sampling barrel (3) to secondarily block the water inlet pipe (32), at the same time, the rotating shaft (10) drives the first pressing block (41) to apply pressure to the waterproof block (12) to perform three times of blocking; Step three: move the in-situ layered groundwater sampling device to another water depth corresponding to the sampling barrel (3) below, start the motor (2) to drive the rotating shaft (10) to rotate by a second angle, open the water inlet pipe (32) corresponding to the sampling barrel (3) below, and start to fill water; Step four: repeat steps two and three until all the sampling barrels (3) are sampled at the required height.

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