Layered sampling device for underground water

Abstract

The invention relates to the technical field of sampling devices, and discloses an underground water stratified sampling device which comprises a sampling pipe and further comprises a cylinder part, a sliding part, a plurality of blocking plates and a plurality of sliding rods, the cylinder part is fixedly connected to the middle of the sampling pipe, the center lines of the cylinder part and the sampling pipe coincide, the sliding part is slidably connected into the cylinder part, and the upper end of the sliding part is pulled through a pulling part; the baffles are uniformly and fixedly connected outside the barrel part in a sleeving manner, a cavity between the barrel part and the sampling pipe is partitioned into a plurality of water storage cavities with the same size by the baffles, a plurality of sliding holes are formed in the middles of the baffles in the circumferential direction in a penetrating manner, and water filling holes communicated with the water storage cavities are formed in the bottoms of the sliding holes; the multiple sliding rods are slidably connected into the sliding holes in a one-to-one correspondence mode, the parts, close to the sampling pipe and the barrel part, of the sliding rods are fixedly connected with sealing plugs in a sleeved mode, one end of each sliding rod extends into the barrel part, and the sliding rods are arranged in the sliding holes and connected with reset parts. According to the invention, underwater continuous classification sampling of underground water with different depths can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of sampling devices, and in particular to a stratified sampling device for groundwater. Background Art

[0002] Water resources are the basic elements of human existence. Water quality monitoring provides basic technical support for the safe use of water resources, prevention of water environment risks, prudent handling of sudden water environment pollution incidents, and improvement of water resources management and utilization. Sampling groundwater bodies is the starting point of water quality monitoring. Accurately taking water samples at different depths is the key to scientifically evaluating groundwater quality. Usually, the groundwater on the surface of the observation well has poor water quality due to the deposition of human pollutants. However, when sampling groundwater, the non-stratified sampling tube usually only takes mixed water samples from the surface, which leads to inaccurate evaluation of groundwater quality.

[0003] At present, for the collection of groundwater samples, a collection device is usually extended into the sampling hole of the observation well, and the water sample is continuously extracted by probing downward. The existing sampling device usually includes a pulling rope, a winding facility for winding the pulling rope, a sampling tube, and a counterweight connected to the bottom of the sampling tube. The sampling tube is mostly a Bailer tube that can be automatically filled with sample water. When sampling, the motor controlling the winding facility continuously lowers the pulling rope and the sampling tube into the water sample until the sampling tube reaches the corresponding sampling depth, so that the water sample of the predetermined area and depth is gradually filled into the sampling tube, and the pulling rope is remotely controlled to pull the sampling tube to realize the sampling of water samples at different depths.

[0004] However, the current sampling device has a relatively simple method for collecting water samples. When sampling, the sampled water sample needs to be pulled up and then lowered. When sampling multiple water samples at different depths, the pulling and lowering operations are frequently performed, which makes the overall sampling process not only more troublesome but also requires frequent pulling of the sampling tube. The frequent up and down displacement of the sampling tube will disturb the pollutants in the water samples at different depths and cause them to mix with each other, thereby affecting the accuracy of the test results and the reliability of the data. Summary of the invention

[0005] The invention provides a stratified sampling device for groundwater, which can realize continuous classification sampling of groundwater at different depths underwater.

[0006] The present invention provides a stratified sampling device for groundwater, comprising a sampling tube, a barrel, a sliding member, a plurality of baffles, and a plurality of sliding rods. The barrel is fixedly connected to the middle of the sampling tube and the center lines of the two coincide with each other. The sliding member is slidably connected to the barrel, and the upper end of the sliding member is pulled up by a pulling member. The plurality of baffles are arranged in an annular shape and are evenly sleeved and fixedly connected to the outside of the barrel. Each baffle separates the cavity between the barrel and the sampling tube into a plurality of water storage cavities of the same size. The middle of the baffle is provided with a plurality of baffles along its circumferential direction. A sliding hole, one end of the sliding hole passes through the cylinder and the other end passes through the sampling tube. A water injection hole connected to the water storage chamber is opened at the bottom of the sliding hole. Multiple sliding rods are slidably connected to each sliding hole in a one-to-one manner. The outer diameter of the sliding rod is smaller than the aperture of the sliding hole. The parts of the sliding rod close to the sampling tube and the cylinder are both sleeved and fixedly connected with sealing plugs. The sealing plugs are used to block the sliding holes. One end of the sliding rod extends into the cylinder. The upward movement of the sliding part squeezes the sliding rod to make the sliding rod slide to the outside of the sampling tube. The sliding rod is placed in the sliding hole and is connected to a reset part.

[0007] Preferably, the sliding member comprises a shaft body, and the upper end of the shaft body and the lower end of the sliding member disposed in 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 baffle plate, and the reset member includes a reset spring, the reset spring sleeve is arranged on the sliding rod and placed between the sealing plug and the sliding sleeve, and the two ends of the reset spring are respectively fixedly connected to the sealing plug and the side wall of the sliding sleeve.

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

[0010] Preferably, the diameter of the water filling hole is larger than the diameter of the sliding hole, and a chamfer is provided on one side of the upper part of the water filling hole close to the sampling tube to facilitate rapid filling of the water sample into the water storage cavity.

[0011] Preferably, the pulling member 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 body, 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 motor and one end of the rope winding shaft are connected to a sliding rod at the same height, and the end of the sliding rod extending into the cylinder has a spacing to allow the traction rope to rise.

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

[0013] Preferably, the ends of the sliding rods at the same height extending into the cylinder member have a spacing for the traction rope to rise.

[0014] Preferably, a water intake hole is opened at the bottom of each water storage cavity of the sampling tube, and the water intake hole is equipped with a plug.

[0015] Preferably, a depth measurement module is connected to the outer wall of the sampling tube at a height close to each baffle plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: multiple sealed water storage chambers with the same volume can be blocked by setting multiple baffles; by providing sliding holes in each baffle and providing a water injection hole at the bottom of the sliding hole, external water samples can be injected into the water storage chamber through the sliding holes and the water injection hole; the sealing plug provided can seal the two ends of the sliding hole; the sealing plug has the effect of opening and closing the sliding hole; when the sealing plug seals the sliding hole, external water cannot enter; when the sealing plug is removed from the sliding hole of the sampling tube, water samples will be injected; the sealing plug close to the side of the cylinder prevents the water sample entering the sliding hole from being injected into the cylinder; the sliding rod provided has the effect of connecting the two sealing plugs connected thereto; and when the sliding rod is displaced in the horizontal direction, It will drive the two sealing plugs to move synchronously. Furthermore, the sliding member can move upward along the cylinder. In the process of moving upward, it will gradually contact and collide with the ends of the sliding rods at each level that extend into the cylinder, so that the sliding rods at the same level can slide outward. At this time, the sealing plug close to the sampling tube will slip out of the sliding hole, thereby realizing the injection of sample water. At this time, the sealing plug close to the cylinder is still sealed with the inner wall of the baffle plate. The injected water sample will quickly flow into the corresponding water storage cavity at the bottom along the sliding hole and the water injection hole. When the sampling of the bottom water storage cavity is completed, the sliding member can be continuously controlled by the pulling member to make the sliding member continue to rise in height. The reset member can be used to drive the sliding rod to reset after the sliding member is no longer in contact with the sliding rod, and restore it to the state of blocking the sliding hole.

[0017] In summary, compared with the sampling method of the prior art, this device does not require the cumbersome process of frequent sampling, first sampling and then sampling, and also reduces the labor intensity of sampling personnel, so that the entire sampling process is efficient and fast. At the same time, it also avoids the frequent up and down of the sampling tube causing the groundwater to be stirred, resulting in the mixing of groundwater pollutants at different levels, which ultimately affects the accuracy of the test results and ensures the scientific nature of the water sample data analysis. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 for Figure 1 A partial enlarged view of part A;

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

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

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

[0023] Figure 6 A schematic diagram of the ball-setting structure of a groundwater stratified sampling device provided in an embodiment of the present invention.

[0024] Description of reference numerals:

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

[0026] A specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation.

[0027] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the technical solutions of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] refer to Figure 1 , Figure 2 and Figure 3The present invention provides a stratified sampling device for groundwater, comprising a sampling tube 1, and further comprising: a barrel 2, a sliding member, a plurality of baffles 5, and a plurality of sliding rods 7. The barrel 2 is fixedly connected to the middle of the sampling tube 1 and the center lines of the two coincide with each other. The sliding member is slidably connected to the barrel 2, and the upper end of the sliding member is pulled up by a pulling member 4. The plurality of baffles 5 are arranged in an annular shape and are evenly sleeved and fixedly connected to the outside of the barrel 2. Each baffle 5 blocks 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 of the baffle 5 is provided with a plurality of sliding holes 51 along its circumferential direction. One end of the sliding hole 51 is provided with a plurality of sliding holes 51. The other end of the cylinder 2 passes through the sampling tube 1, and a water injection hole 52 connected to the water storage chamber 6 is opened at the bottom of the sliding hole 51. A plurality of sliding rods 7 are slidably connected to each sliding hole 51 in a one-to-one manner. The outer diameter of the sliding rod 7 is smaller than the aperture of the sliding hole 51. The parts of the sliding rod 7 close to the sampling tube 1 and the cylinder 2 are sleeved and fixedly connected 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 cylinder 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 is connected to a reset member for resetting the sliding rod 7.

[0029] In the above embodiments, a plurality of blocking plates 5 are provided to block a plurality of sealed water storage chambers 6 with the same volume. By providing a sliding hole 51 to each blocking plate 5 and providing a water injection hole 52 at the bottom of the sliding hole 51, it is possible to inject external water into the water storage chamber 6 through the sliding hole 51 and the water injection hole 52. The sealing plug 8 provided therein can seal the two ends of the sliding hole 51. The sealing plug 8 has the effect of opening and closing the sliding hole 51. When the sealing plug 8 seals the sliding hole 51, external water cannot enter. When the sealing plug 8 is outside, the sliding hole 51 is sealed. When the sampling tube 1 is taken off from the sliding hole 51, the water sample will be poured in. The sealing plug 8 close to the side of the cylinder 2 prevents the water sample entering the sliding hole 51 from pouring into the cylinder 2. The sliding rod 7 is provided to connect the two sealing plugs 8 connected thereto. At the same time, when the sliding rod 7 moves in the horizontal direction, the two sealing plugs 8 will be driven to move synchronously. Furthermore, the sliding member can move upward along the cylinder 2. In the process of moving upward, it will gradually contact and collide with the ends of the sliding rods 7 at each height extending into the cylinder 2, so as to prevent the water sample from entering the sliding hole 51 and pouring into the cylinder 2. The sliding rods 7 at the same height are made to slide outward. At this time, the sealing plug 8 near the sampling tube 1 will slip out of the sliding hole 51, thereby realizing the injection of sample water. At this time, the sealing plug 8 near the cylinder 2 is still sealed with the inner wall of the baffle plate 5, and the injected water sample will quickly flow into the corresponding water storage chamber 6 at the bottom along the sliding hole 51 and the water injection hole 52. After the sampling of the bottom water storage chamber 6 is completed, the sliding member can be continuously controlled by the pulling member 4 to make the sliding member height continue to rise. The reset member set can realize that after the sliding member is no longer in contact with the sliding rod 7, the sliding rod 7 can be driven to reset and restore to the state of blocking the sliding hole 51. In summary, compared with the sampling method of the prior art, the present device does not require the cumbersome process of frequent sampling and then sampling, and also reduces the labor intensity of the sampling personnel, so that the entire sampling process is efficient and fast, and also avoids the frequent up and down movement of the sampling tube 1 causing the groundwater to be stirred, so that the groundwater pollutants and even microorganisms at different levels are mixed, which ultimately affects the accuracy of the test results and ensures the reliability of the water sample data analysis.

[0030] Further, refer to Figure 3 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 placed in the cylinder 2 are both provided with chamfered corners.

[0031] In the above embodiments, since the upper end of the shaft body 3 and the lower end of the sliding rod 7 are angular, it is difficult to achieve the effect of squeezing each sliding rod 7 to slide into the sliding hole 51. Therefore, by limiting the upper end of the shaft body 3 and the lower end of the sliding member placed in the cylinder 2 to have chamfered corners, it is possible to quickly squeeze the end of the sliding rod 7 extending into the cylinder 2 to slide into the sliding hole 51 when moving on the shaft body 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 inner wall of the blocking plate 5. The reset member includes a reset spring 9. The reset spring 9 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 respectively fixedly connected to the sealing plug 8 and the side wall of the sliding sleeve 10.

[0033] In the above embodiments, the sliding sleeve 10 is a sleeve-shaped component, and at least two sliding sleeves 10 can ensure that the sliding rod 7 does not have an angular deviation when sliding, thereby improving the sliding stability.

[0034] Further, refer to Figure 3 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 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 smaller than the axial length of the chamfer of the sliding rod 7 extending into the cylinder 2, when the sliding rod 7 is squeezed and slid to the limit, the sealing plug 8 can extend out of the sliding hole 51 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 the diameter of the sliding hole 51 , and a chamfer 521 is provided on one side of the upper part of the water filling hole 52 close to the sampling tube 1 to facilitate the rapid filling of the water sample into the water storage chamber 6 .

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

[0038] Further, refer to Figure 1 The pulling member 4 includes a traction rope 41, a rope winding shaft 42, and a motor 43 for driving the rope winding shaft 42 to rotate. The traction rope 41 is fixedly connected to the upper end of the shaft body 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 motor 43 and one end of the rope winding shaft 42 are connected to the sliding rod 7 at the same height, and the end extending into the cylinder 2 leaves 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 through a rotating frame for transverse rotation, and the traction rope 41 is driven by a motor 43 to pull the shaft body 3 upward to slide using a "winch" structure.

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

[0041] In the above embodiment, in order to consider that the shaft body 3 needs to slide toward the bottom of the sampling tube 1 for subsequent resetting, when the lower end of the shaft body 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 to slide into the sliding hole 51. Therefore, matching chamfers are set at the lower end of the shaft body 3 and the upper part of the sliding rod 7 to facilitate their contact. Furthermore, in this embodiment, balls 31 are embedded in the upper and lower chamfered arc surfaces of the shaft body 3, which further reduces friction and is conducive to driving the lateral sliding of the sliding rod 7.

[0042] Further, refer to Figure 2 In order to prevent the ends of the sliding rod 7 extending into the cylinder 2 from having too small a spacing to affect the rise of the traction rope 41, the present device limits the ends of the sliding rods 7 extending into the cylinder 2 at the same height to leave a spacing to allow the traction rope 41 to rise.

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

[0044] Further, refer to Figure 1 and Figure 3 The sampling tube 1 is provided with a water intake hole 11 at the bottom of each water storage cavity 6 , and the water intake hole 11 is adapted to be equipped with a plug body 12 .

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

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

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

[0048] like Figure 3 and Figure 6As shown, taking into account the situation of repeated use, when the shaft body 3 moves up to the highest position, it cannot be reset to the bottom after taking water. Therefore, preferably, in this embodiment, a hook is set at the lower end of the shaft body 3, and the sampling tube 1 is located at the bottom of the cylinder 2 and a through hole is opened, and the through hole is provided with a plug. When the shaft body 3 is driven to reset, the rod body with the hook can be extended into the cylinder and hooked with the hook at the lower end of the shaft body 3. Then, it can be pulled downward to make the shaft body 3 resist the elastic force of each reset spring 9 and reset to the bottom, so as to prepare for the next sampling.

[0049] Preferably, Figure 5 As shown, considering that after the sample water is taken out, water is likely to accumulate in the water storage chamber 6, a guide plate 61 is provided at the bottom of each water storage chamber 6 in this embodiment. The middle portion of the guide plate 61 is higher than the edges, and the middle portion is sleeved and fixedly connected to the outer wall of the cylinder 2. When the plug body 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 the sample water. 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 provided at the outer ends of the sampling tube 1 and the sliding rod 7 near the depth measurement module. When the sliding rod 7 slides outward to the extreme position, the sliding hole 51 is in an open state. At this time, the sampling personnel can understand the specific water filling situation remotely.

[0051] The above disclosures are only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A stratified sampling device for groundwater, comprising a sampling tube (1), characterized in that: Also includes: The cylinder (2) is fixedly connected to the middle of the sampling tube (1) and the center lines of the two coincide with each other; A sliding member is slidably connected to the cylinder member (2), and the upper end of the sliding member is pulled upward by a pulling member (4); A plurality of baffle plates (5) are arranged in an annular shape and are evenly sleeved and fixedly connected to the outside of the cylinder (2). Each baffle plate (5) blocks the cavity between the cylinder (2) and the sampling tube (1) into a plurality of water storage chambers (6) of the same size. A plurality of sliding holes (51) are provided in the middle of the baffle plate (5) along its circumference. One end of the sliding hole (51) passes through the cylinder (2) and the other end passes through the sampling tube (1). A water injection hole (52) connected to the water storage chamber (6) is provided at the bottom of the sliding hole (51); A plurality of sliding rods (7) are slidably connected in the sliding holes (51) one by one. The outer diameter of the sliding rod (7) is smaller than the diameter of the sliding hole (51). The portions of the sliding rod (7) close to the sampling tube (1) and the cylinder (2) are sleeved and fixedly connected with sealing plugs (8). The sealing plugs (8) are used to block the sliding hole (51). One end of the sliding rod (7) extends into the cylinder (2). The upward movement of the sliding member squeezes the sliding rod (7) so that the sliding rod (7) slides toward the outside of the sampling tube (1). The sliding rod (7) is placed in the sliding hole (51) and is connected to a reset member for resetting the sliding rod (7).

2. A stratified sampling device for groundwater according to claim 1, characterized in that: The sliding member comprises an axle body (3), and the upper end of the axle body (3) and the lower end of the sliding member placed in the cylinder (2) are both provided with rounded corners.

3. A stratified sampling device for groundwater according to claim 1, characterized in that: 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 blocking plate (5), and the reset member 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), and the two ends of the reset spring (9) are respectively fixedly connected to the sealing plug (8) and the side wall of the sliding sleeve (10).

4. A stratified sampling device for groundwater according to claim 2, characterized in that: 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 its thickness is smaller than the axial length of the rounded corner of the sliding rod (7) extending into the cylinder (2).

5. A stratified sampling device for groundwater according to claim 1, characterized in that: The diameter of the water injection hole (52) is larger than the diameter of the sliding hole (51), and a chamfer (521) is provided on one side of the upper part of the water injection hole (52) close to the sampling tube (1) to facilitate rapid injection of water samples into the water storage chamber (6).

6. A stratified sampling device for groundwater according to claim 2, characterized in that: The pulling member (4) comprises a traction rope (41), a rope winding shaft (42), and a motor (43) for driving the rope winding shaft (42) to rotate, wherein the traction rope (41) is fixedly connected to the upper end of the shaft body (3), and the other end of the traction rope (41) is fixedly connected to the rope winding shaft (42), and the rope winding shaft (42) is transversely arranged in the uppermost cavity of the sampling tube (1). The motor (43) and one end of the rope winding shaft (42) are connected to the sliding rod (7) at the same height, and the end of the sliding rod (7) extending into the cylinder (2) leaves a spacing for the traction rope (41) to rise.

7. A stratified sampling device for groundwater according to claim 6, characterized in that: The ends of the sliding rods (7) at the same height extending into the cylinder (2) have a spacing for the traction rope (41) to rise.

8. A groundwater stratified sampling device as claimed in claim 1, characterized in that: The sampling tube (1) is provided with a water intake hole (11) at the bottom corresponding to each of the water storage chambers (6), and the water intake hole (11) is adapted to be equipped with a plug body (12).

9. A stratified sampling device for groundwater according to claim 1, characterized in that: The outer wall of the sampling tube (1) is connected to a depth measurement module at a height close to each baffle plate (5).

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