A stratified sampling device for groundwater

Abstract

This invention relates to the field of sampling device technology and discloses a stratified groundwater sampling device, including a sampling tube, and further comprising: a cylindrical component, a sliding component, multiple baffle plates, and multiple sliding rods. The cylindrical component is fixedly connected to the middle of the sampling tube with their center lines coinciding. The sliding component is slidably connected inside the cylindrical component, and its upper end is pulled by a pulling component and uniformly fitted and fixed to the outside of the cylindrical component. Each baffle plate divides the cavity between the cylindrical component and the sampling tube into multiple water storage cavities of the same size. Multiple sliding holes are formed through the middle of the baffle plate along its circumference. The bottom of each sliding hole has a water filling hole communicating with the water storage cavity. Multiple sliding rods are slidably connected to each sliding hole in a corresponding manner. Sealing plugs are fitted and fixed to the portions of the sliding rods near the sampling tube and the cylindrical component. One end of each sliding rod extends into the cylindrical component, and a reset component is connected to the sliding rod within the sliding hole. This invention enables continuous underwater stratified sampling of groundwater at different depths.

Description

Technical Field

[0001] This invention relates to the field of sampling device technology, and in particular to a stratified sampling device for groundwater. Background Technology

[0002] Water resources are a fundamental element for human society. Water quality monitoring provides essential technical support for the safe utilization of water resources, the prevention of water environment risks, the proper handling of sudden water pollution incidents, and the improvement of water resource management and utilization. Sampling groundwater is the starting point for water quality monitoring, and accurately collecting water samples at different depths is crucial for the scientific evaluation of groundwater quality. Surface groundwater in observation wells is often of poor quality due to the deposition of anthropogenic pollutants. However, when sampling groundwater, non-stratified sampling tubes typically only collect surface mixed water samples, leading to inaccurate assessments of groundwater quality.

[0003] Currently, groundwater sampling typically involves inserting a sampling device into the sampling hole of an observation well and continuously lowering it to extract water samples. Existing sampling devices usually include a pull rope, a winding device for retracting the pull rope, a sampling tube, and a counterweight connected to the bottom of the sampling tube. The sampling tube is often a Belle tube that can automatically fill with sample water. During sampling, the motor controlling the winding device continuously lowers the pull rope and sampling tube into the water sample until the sampling tube reaches the corresponding sampling depth, allowing water samples from the predetermined area and depth to gradually fill the sampling tube. The pull rope is remotely controlled to pull up the sampling tube to achieve sampling of water samples at different depths.

[0004] However, current sampling devices have a relatively simple method for collecting water samples. During sampling, the water sample needs to be pulled up and then lowered. When sampling multiple water samples at different depths, the frequent pulling and lowering operations make the overall sampling process not only cumbersome, but also cause the sampling tube to be frequently pulled up and down. During the frequent up and down movement of the sampling tube, pollutants in water samples at different depths are disturbed and mixed together, which affects the accuracy of the test results and the reliability of the data. Summary of the Invention

[0005] This invention provides a stratified sampling device for groundwater, which can continuously classify and sample groundwater at different depths.

[0006] This invention provides a stratified groundwater sampling device, including a sampling tube, and further comprising: a cylindrical component, a sliding component, multiple baffles, and multiple sliding rods. The cylindrical component is fixedly connected to the middle of the sampling tube with their center lines coinciding. The sliding component is slidably connected inside the cylindrical component, and its upper end is pulled upward by a pulling component. The multiple baffles are arranged in a ring and are evenly fitted and fixed to the outside of the cylindrical component. Each baffle divides the cavity between the cylindrical component and the sampling tube into multiple water storage cavities of the same size. Multiple baffles are formed through the middle of the baffle along its circumference. A sliding hole is provided, with one end penetrating the cylindrical component and the other end penetrating the sampling tube. A water filling hole connected to the water storage chamber is provided at the bottom of the sliding hole. Multiple sliding rods are slidably connected to each sliding hole in a corresponding manner. The outer diameter of the sliding rod is smaller than the diameter of the sliding hole. The part of the sliding rod close to the sampling tube and the cylindrical component is fitted with a sealing plug, which is used to seal the sliding hole. One end of the sliding rod extends into the cylindrical component. The upward movement of the sliding component squeezes the sliding rod, causing the sliding rod to slide outward of the sampling tube. The sliding rod is placed in the sliding hole and connected to a reset component.

[0007] Preferably, the sliding member includes a shaft, and the upper end of the shaft and the lower end of the sliding member placed inside the cylinder are both provided with rounded corners.

[0008] Preferably, the sliding rod is slidably connected to the sliding hole through at least two sliding sleeves, the center lines of the two sliding sleeves are collinear, the upper end of the sliding sleeve is fixedly connected to the upper part of the inner wall of the barrier plate, and the reset component includes a reset spring, which is sleeved on the sliding rod and placed between the sealing plug and the sliding sleeve, and the two ends of the reset spring are fixedly connected to the sealing plug and the side wall of the sliding sleeve, respectively.

[0009] Preferably, the outer surface of the sealing plug on the side closest to the inner wall of the sampling tube is flush with the outer wall of the sampling tube, and its thickness is less than the axial length of the rounded corner of the sliding rod extending into the cylinder.

[0010] Preferably, the diameter of the water inlet is larger than that of the sliding hole, and a chamfer is provided on the upper part of the water inlet near the sampling tube to facilitate the rapid injection of water sample into the water storage chamber.

[0011] Preferably, the pulling component includes a traction rope, a rope winding shaft, and a motor for driving the rope winding shaft to rotate. The traction rope is fixedly connected to the upper end of the shaft, and the other end of the traction rope is fixedly connected to the rope winding shaft. The rope winding shaft is horizontally arranged in the uppermost cavity of the sampling tube. The end of the sliding rod at the same height as one end of the motor and the rope winding shaft that extends into the tube is left with a gap to allow the traction rope to rise.

[0012] Preferably, the lower end of the shaft and the upper part of the end of the sliding rod that extends into the cylinder are both provided with rounded corners.

[0013] Preferably, the ends of the sliding rods at the same height that extend into the cylinder are spaced apart to allow the traction rope to rise.

[0014] Preferably, the sampling tube has a water intake hole at the bottom of each water storage chamber, and the water intake hole is fitted with a plug.

[0015] Preferably, depth measurement modules are connected to the outer wall of the sampling tube at a height close to each barrier plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: Multiple baffles can isolate multiple sealed water storage chambers of the same volume. By providing sliding holes in each baffle and filling holes at the bottom of the sliding holes, external water samples can be injected into the water storage chambers through the sliding holes and filling holes. The sealing plugs can seal both ends of the sliding holes, effectively opening and closing them. When the sealing plugs block the sliding holes, external water cannot enter; when the sealing plugs are removed from the sliding holes of the sampling tube, water samples can be injected. The sealing plug near the cylinder prevents water samples entering the sliding holes from being injected into the cylinder. The sliding rod connects the two sealing plugs. Furthermore, when the sliding rod moves horizontally... This will cause the two sealing plugs to move synchronously. Furthermore, the sliding component can move upward along the cylinder. During the upward movement, it will gradually contact and collide with the ends of the sliding rods at each layer height that extend into the cylinder, so that the sliding rods at the same layer height slide outward. At this time, the sealing plug near the sampling tube will dislodge from the sliding hole, thus realizing the injection of sample water. At this time, the sealing plug near the cylinder is still sealed with the inner wall of the barrier plate. The injected water sample will be quickly injected into the corresponding water storage chamber at the bottom through the sliding hole and the water injection hole. After the bottom water storage chamber is sampled, the sliding component can be continuously controlled by the pulling component to make the height of the sliding component continuously rise. The reset component can be used to drive the sliding rod to reset after the sliding component no longer contacts the sliding rod, restoring the state of sealing the sliding hole.

[0017] In summary, compared with existing sampling methods, this device eliminates the cumbersome process of frequent sampling followed by repeated sampling, reducing the workload of sampling personnel and making the entire sampling process more efficient and faster. It also avoids the disturbance of groundwater caused by frequent up-and-down movement of the sampling tube, which could lead to the mixing of pollutants from different groundwater layers and ultimately affect the accuracy of the test results, thus ensuring the scientific nature of the water sample data analysis. Attached Figure Description

[0018] Figure 1 A schematic diagram of the internal structure of a stratified groundwater sampling device provided in an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0020] Figure 3A partial structural schematic diagram of a stratified sampling device for groundwater provided in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the sampling tube structure in a stratified groundwater sampling device provided in an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the flow guide plate in a stratified groundwater sampling device provided in an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the ball bearing inlay structure of a stratified groundwater sampling device provided in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Sampling tube; 11. Water intake hole; 12. Plug; 2. Cylinder; 3. Shaft; 31. Ball bearing; 4. Pulling component; 41. Traction rope; 42. Rope winding shaft; 43. Motor; 5. Baffle plate; 51. Sliding hole; 52. Water filling hole; 521. Chamfer; 6. Water storage chamber; 61. Guide plate; 7. Sliding rod; 8. Sealing plug; 9. Return spring; 10. Sliding sleeve. Detailed Implementation

[0026] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] refer to Figure 1 , Figure 2 and Figure 3This invention provides a stratified groundwater sampling device, including a sampling tube 1, and further comprising: a cylindrical component 2, a sliding component, multiple baffle plates 5, and multiple sliding rods 7. The cylindrical component 2 is fixedly connected to the middle of the sampling tube 1 with their center lines coinciding. The sliding component is slidably connected inside the cylindrical component 2, and its upper end is pulled upward by a pulling component 4. The multiple baffle plates 5 are arranged in a ring and are evenly fitted and fixed to the outside of the cylindrical component 2. Each baffle plate 5 divides the cavity between the cylindrical component 2 and the sampling tube 1 into multiple water storage cavities 6 of the same size. Multiple sliding holes 51 are opened through the middle of the baffle plate 5 along its circumference. One end of each sliding hole 51... The other end of the through-tube 2 passes through the sampling tube 1. The bottom of the sliding hole 51 is provided with a water filling hole 52 that communicates with the water storage chamber 6. Multiple sliding rods 7 are slidably connected in each sliding hole 51. The outer diameter of the sliding rod 7 is smaller than the diameter of the sliding hole 51. The part of the sliding rod 7 near the sampling tube 1 and the tube 2 is fitted with a sealing plug 8. The sealing plug 8 is used to block the sliding hole 51. One end of the sliding rod 7 extends into the tube 2. The upward movement of the sliding member squeezes the sliding rod 7 so that the sliding rod 7 slides to the outside of the sampling tube 1. The sliding rod 7 is placed in the sliding hole 51 and connected with a reset member to reset the sliding rod 7.

[0029] In the above embodiments, multiple baffle plates 5 can be used to block multiple sealed water storage chambers 6 with the same volume. By providing sliding holes 51 to each baffle plate 5 and filling holes 52 at the bottom of the sliding holes 51, external water samples can be injected into the water storage chamber 6 through the sliding holes 51 and the filling holes 52. The sealing plugs 8 can seal both ends of the sliding holes 51, and the sealing plugs 8 have the effect of opening and closing the sliding holes 51. When the sealing plugs 8 block the sliding holes 51, external water cannot enter. The water sample is removed from the sliding hole 51 of the sampling tube 1. At this time, the water sample will be poured in. The sealing plug 8 near the side of the cylinder 2 prevents the water sample entering the sliding hole 51 from being poured into the cylinder 2. The sliding rod 7 connects the two sealing plugs 8. When the sliding rod 7 moves horizontally, it will drive the two sealing plugs 8 to move synchronously. Furthermore, the sliding member can move upward along the cylinder 2. During the upward movement, it will gradually contact and collide with the ends of the sliding rods 7 at each level that extend into the cylinder 2. The sliding rods 7 at the same height slide outwards, causing the sealing plug 8 near the sampling tube 1 to dislodge from the sliding hole 51, thus allowing the sample water to be injected. At this time, the sealing plug 8 near the cylinder 2 remains sealed to the inner wall of the barrier plate 5. The injected water sample will quickly flow into the corresponding bottom water storage chamber 6 through the sliding hole 51 and the water injection hole 52. After the bottom water storage chamber 6 is sampled, the sliding member can be continuously controlled by the pulling member 4 to continuously raise the height of the sliding member. The reset member can be set to reset the sliding rod 7 after the sliding member is no longer in contact with the sliding rod 7, restoring it to the state of sealing the sliding hole 51. In summary, compared with the sampling method of the prior art, this device does not require the cumbersome process of frequent sampling followed by sampling and then sampling again, and also reduces the labor intensity of the sampling personnel, making the entire sampling process efficient and fast. It also avoids the groundwater being disturbed by the frequent up and down of the sampling tube 1, which would cause the mixing of pollutants and even microorganisms in the groundwater at different levels, ultimately affecting the accuracy of the test results and ensuring the reliability of the water sample data analysis.

[0030] Further, refer to Figure 3 The sliding component includes a shaft 3, and both the upper end of the shaft 3 and the lower end of the sliding component placed inside the cylinder 2 are provided with rounded corners.

[0031] In the above embodiments, since the upper end of the shaft 3 and the lower part of the sliding rod 7 are angular, it is difficult to achieve the effect of squeezing each sliding rod 7 into the sliding hole 51. Therefore, by limiting the upper end of the shaft 3 and the lower end of the sliding member placed in the cylinder 2 to have rounded corners, it is convenient to quickly squeeze the end of the sliding rod 7 that extends into the cylinder 2 into the sliding hole 51 when moving along the shaft 3.

[0032] Further, refer to Figure 2 and Figure 3 The sliding rod 7 is slidably connected to the sliding hole 51 through at least two sliding sleeves 10. The center lines of the two sliding sleeves 10 are collinear. The upper end of the sliding sleeve 10 is fixedly connected to the upper part of the inner wall of the barrier plate 5. The reset component includes a reset spring 9, which is sleeved on the sliding rod 7 and placed between the sealing plug 8 and the sliding sleeve 10. The two ends of the reset spring 9 are fixedly connected to the sealing plug 8 and the side wall of the sliding sleeve 10, respectively.

[0033] In the above embodiments, the sliding sleeve 10 is a sleeve-shaped component. At least two sliding sleeves 10 can ensure that the sliding rod 7 will not deviate in angle when sliding, thereby improving the smoothness of sliding.

[0034] Further, refer to Figure 3 The outer surface of the sealing plug 8, which is close to the inner wall of the sampling tube 1, is flush with the outer wall of the sampling tube 1, and its thickness is less than the axial length of the rounded corner of the sliding rod 7 extending into the cylinder 2.

[0035] In the above embodiments, by limiting the thickness of the corresponding sealing plug 8 to be less than the axial length of the rounded corner of the sliding rod 7 extending into the cylinder 2, the sealing plug 8 can extend out of the sliding hole 51 when the sliding rod 7 is squeezed and slid to its limit, so as to ensure the opening of the sliding hole 51.

[0036] Further, refer to Figure 2 The diameter of the water filling hole 52 is larger than that of the sliding hole 51. The upper part of the water filling hole 52 near the sampling tube 1 has a chamfer 521 to facilitate the rapid filling of water sample into the water storage chamber 6.

[0037] In the above embodiments, by limiting the aperture size of the water filling hole 52 to be larger than that of the sliding hole 51, the amount of water poured into the water storage chamber 6 at the same time can be increased, thereby improving the sampling efficiency. By opening the chamfer 521, the sample water that has just entered the sliding hole 51 can be preferentially poured into the water storage chamber 6 through the guide of the chamfer 521.

[0038] Further, refer to Figure 1 The pulling component 4 includes a traction rope 41, a rope winding shaft 42, and a motor 43 that drives the rope winding shaft 42 to rotate. The traction rope 41 is fixedly connected to the upper end of the shaft 3, and the other end of the traction rope 41 is fixedly connected to the rope winding shaft 42. The rope winding shaft 42 is horizontally arranged in the uppermost cavity of the sampling tube 1. The end of the sliding rod 7, which is connected to one end of the motor 43 and the rope winding shaft 42 at the same height, that extends into the cylinder 2 has a gap to allow the traction rope 41 to rise.

[0039] In the above embodiments, the rope winding shaft 42 is connected to the upper extension cavity of the sampling tube by a rotating frame, and the traction rope 41 is driven by the motor 43 to pull the shaft 3 upward by a structure similar to a "winch".

[0040] Further, refer to Figure 3 The lower end of the shaft 3 and the upper part of the end of the sliding rod 7 that extends into the cylinder 2 are both provided with rounded corners.

[0041] In the above embodiments, considering that the shaft 3 needs to slide to the bottom of the sampling tube 1 for subsequent reset, and since the lower end of the shaft 3 and the upper part of the sliding rod 7 are angular, it is difficult to achieve the effect of squeezing each sliding rod 7 into the sliding hole 51. Therefore, the lower end of the shaft 3 and the upper part of the sliding rod 7 are provided with matching rounded corners to facilitate contact. Furthermore, in this embodiment, ball bearings 31 are embedded in the upper and lower rounded corner arc surfaces of the shaft 3 to further reduce friction and facilitate the lateral sliding of the sliding rod 7.

[0042] Further, refer to Figure 2 To avoid the excessively small gap between the ends of the sliding rods 7 extending into the cylinder 2, which would affect the rise of the traction rope 41, this device limits the gap between the ends of the sliding rods 7 at the same height that extend into the cylinder 2 to allow the traction rope 41 to rise.

[0043] In the above embodiments, when the traction rope 41 moves upward as driven by the motor 43 and the winding shaft 42, a gap is left between the ends of each sliding rod 7 that extends into the cylinder 2 and the traction rope 41.

[0044] Further, refer to Figure 1 and Figure 3 Each sampling tube 1 has a water intake hole 11 at the bottom of each water storage chamber 6, and the water intake hole 11 is fitted with a plug 12.

[0045] In the above embodiments, considering that the sampling personnel will eventually need to collect the water sampled by the stratified sampling, the device has a water intake hole 11 at the bottom of each water storage chamber 6 corresponding to the sampling tube 1. The water intake hole 11 is adapted to a plug 12, which can seal the water intake hole 11 and has a sealing rubber layer on its periphery.

[0046] Further, refer to Figure 3 A depth measurement module is connected to the outer wall of the sampling tube 1 at a height close to each of the barrier plates 5.

[0047] In the above embodiments, by setting a depth measurement module, it is possible for sampling personnel to understand the depth of sampling tube 1 in real time at the observation well. This depth measurement module is a conventional measurement module with an electronic transceiver, which transmits the depth signal to the main control instrument above via a wire.

[0048] like Figure 3 and Figure 6As shown, considering the case of repeated use, after the shaft 3 moves to the highest position and water is taken, it cannot be reset to the bottom. Therefore, in this embodiment, a hook is set at the lower end of the shaft 3, and the sampling tube 1 is provided with a through hole at the bottom of the cylinder 2. The through hole is blocked. When the shaft 3 is driven to reset, the rod with the hook can be inserted into the cylinder and hooked with the hook at the lower end of the shaft 3. Then, pulling it down will cause the shaft 3 to resist the elastic force of each reset spring 9 and reset to the bottom, preparing for the next sampling.

[0049] Preferred, such as Figure 5 As shown, considering that water may easily accumulate in the water storage chamber 6 after the sample water is removed, a guide plate 61 is provided at the bottom of each water storage chamber 6 in this embodiment. The middle part of the guide plate 61 is higher than each edge, and the middle part is sleeved and fixed to the outer wall of the cylinder 2. When the plug 12 is opened, the sample water will leak out from the water intake hole 11. At this time, only the sampling personnel need to collect it. At the same time, the accumulated sample water will also flow along the guide plate 61 to one side of the water intake hole 11.

[0050] Preferably, an electromagnetic induction module and a signal transceiver module are installed at the outer end of the sampling tube 1 and the sliding rod 7 near the depth measurement module. When the sliding rod 7 slides outward to the limit position, the sliding hole 51 is in the open state. At this time, the sampling personnel can remotely understand the specific water filling situation.

[0051] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A device for stratified sampling of groundwater, comprising a sampling tube (1), characterised in that, Also include: The barrel (2) is fixed to the middle part of the sampling tube (1) and the center lines coincide; The sliding member is slidingly connected in the barrel (2), and the upper end of the sliding member is pulled up by the pulling member (4); A plurality of barrier plates (5) are arranged in a ring shape and uniformly sleeved and fixed outside the barrel (2), each barrier plate (5) divides the cavity between the barrel (2) and the sampling tube (1) into a plurality of water storage cavities (6) of the same size, the middle part of the barrier plate (5) is provided with a plurality of sliding holes (51) penetrating along the circumferential direction, one end of the sliding hole (51) penetrates the barrel (2) and the other end penetrates the sampling tube (1), and the bottom of the sliding hole (51) is provided with a water filling hole (52) communicating with the water storage cavity (6); A plurality of sliding rods (7) are slidingly connected in each sliding hole (51) one by one, the outer diameter of the sliding rod (7) is smaller than the hole diameter of the sliding hole (51), and the part of the sliding rod (7) close to the sampling tube (1) and the barrel (2) is sleeved and fixed with a sealing plug (8), the sealing plug (8) is used to block the sliding hole (51), one end of the sliding rod (7) extends into the barrel (2), and the upward movement of the sliding member extrudes the sliding rod (7), so that the sliding rod (7) slides outward of the sampling tube (1), the sliding rod (7) is connected with a reset member in the sliding hole (51) to reset the sliding rod (7), the sliding rod (7) is slidingly connected in the sliding hole (51) through at least two sliding sleeves (10), the center lines of the two sliding sleeves (10) are collinear, the upper end of the sliding sleeve (10) is fixed to the upper part of the inner wall of the barrier plate (5), and the reset member includes a reset spring (9), the reset spring (9) is sleeved on the sliding rod (7) and is arranged between the sealing plug (8) and the sliding sleeve (10), the two ends of the reset spring (9) are fixed to the sealing plug (8) and the side wall of the sliding sleeve (10) respectively, the continuous control of the pulling member (4) on the sliding member enables the continuous upward movement of the sliding member, and the underground continuous classified sampling of groundwater at different depths is realized.

2. A stratified groundwater sampling device as claimed in claim 1, wherein, The sliding member includes a shaft body (3), and the upper end of the shaft body (3) and the lower end of the sliding member arranged in the barrel (2) are both provided with a rounded corner.

3. An apparatus for stratified sampling of ground water as claimed in claim 2 wherein, The outer surface of the sealing plug (8) close to the inner wall of the sampling tube (1) is flush with the outer wall of the sampling tube (1), and the thickness is smaller than the axial length of the rounded corner of the sliding rod (7) extending into the barrel (2).

4. The apparatus of claim 1, wherein, The hole diameter of the water filling hole (52) is larger than the hole diameter of the sliding hole (51), and the upper part of the water filling hole (52) close to the sampling tube (1) is provided with a chamfer (521) for quickly filling water sample into the water storage cavity (6).

5. An apparatus for stratified sampling of ground water as claimed in claim 2 wherein, The pulling member (4) comprises a traction rope (41), a winding rope shaft (42), and a motor (43) for driving the winding rope shaft (42) to rotate, the traction rope (41) is fixedly connected with the upper end of the shaft body (3), the other end of the traction rope (41) is fixedly connected with the winding rope shaft (42), the winding rope shaft (42) is transversely arranged in the uppermost end cavity of the sampling tube (1), and the end of the motor (43) connected with one end of the winding rope shaft (42) is connected with the end of the sliding rod (7) extending into the barrel (2) at the same height and is left with a spacing for the traction rope (41) to ascend.

6. An apparatus for stratified sampling of groundwater as claimed in claim 5 wherein, The end of the sliding rod (7) extending into the barrel (2) at the same height is left with a spacing for the traction rope (41) to ascend.

7. The apparatus of claim 1, wherein, The sampling tube (1) is provided with a water taking hole (11) at the bottom of each water storage cavity (6), and the water taking hole (11) is matched with a plug body (12).

8. The apparatus of claim 1, wherein, The outer wall of the sampling tube (1) is connected with a depth measuring module at the height close to each blocking plate (5).

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