Layered sampling device

Abstract

The utility model provides a stratified sampling device which is characterized in that sampling boxes are arranged at intervals, adjusting screw rods are connected among the sampling boxes, sampling cavities are formed in the sampling boxes, unlocking pipes are arranged in the sampling cavities in a sliding manner, the bottom ends of the unlocking pipes extend to the lower parts of the sampling boxes, and sampling bottles are arranged in the sampling cavities of the corresponding sampling boxes in a sliding manner; the sampling bottle can drive the unlocking pipe to slide down due to sliding down, a water inlet pipe is arranged at the top of the sampling bottle, the unlocking pipe of the sampling box at the upper part is inserted into the water inlet pipe at the lower part, a locking mechanism is arranged in the water inlet pipe inserted with the unlocking pipe, and when the unlocking pipe slides down, the locking mechanism can be unlocked, and the water inlet pipe is unblocked. By arranging the sampling boxes and the adjusting screw rods arranged between the adjacent sampling boxes, the distance between the sampling boxes can be adjusted when the length of the adjusting screw rods extending into the sampling boxes is changed, and due to the fact that the sampling cavities are formed in the sampling boxes and the sampling bottles are arranged in the sampling cavities, water at different depths can be sampled conveniently.

Description

Technical Field

[0001] The utility model belongs to the technical field of sampling devices, and more specifically relates to a layered sampling device. Background Art

[0002] With the development of society, environmental pollution is becoming more and more serious, especially the problem of water pollution, which is receiving more and more attention.

[0003] In some specific pollution scenarios, water quality can differ significantly at different depths within a body of water, often manifesting as better water quality in the upper layers and poorer water quality in the lower layers, potentially containing higher concentrations of pollutants. This phenomenon is particularly common in static or slow-flowing water bodies, such as reservoirs and lakes. Water stratification can hinder the natural exchange between upper and lower water layers, leading to chronic hypoxia in the bottom water, promoting the growth of anaerobic bacteria, and exacerbating the accumulation of harmful substances in the water, impacting the health of aquatic ecosystems and water quality safety.

[0004] In existing water quality testing technologies, it is difficult to sample water at different depths, and thus difficult to obtain water quality data at different depths through testing. Utility Model Content

[0005] The purpose of the utility model is to provide a layered sampling device for sampling water at different depths.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a layered sampling device is provided, comprising a plurality of sampling boxes, a plurality of sampling bottles and a hand rope, wherein the sampling boxes are arranged at intervals, and an adjusting screw is connected between the sampling boxes, and the adjusting screw can adjust the length of the screw inserted into the sampling box by rotation, and a sampling cavity is provided inside the sampling cavity, and an unlocking tube is slidably provided in the sampling cavity, and the bottom end of the unlocking tube extends to the bottom of the sampling box; a plurality of sampling bottles correspond to the sampling boxes one by one, and the sampling bottles are slidably provided in the corresponding In the sampling cavity of the sampling box, the sampling bottle can drive the unlocking tube to slide down due to its sliding down. A water inlet pipe is provided on the top of the sampling bottle. In the two adjacent sampling boxes, the unlocking tube of the upper sampling box is inserted into the water inlet pipe of the sampling bottle in the lower sampling box. A locking mechanism is provided in the water inlet pipe where the unlocking tube is inserted. When the locking mechanism is locked, the water inlet pipe is blocked; and when the unlocking tube slides down, the locking mechanism can be unlocked, and the water inlet pipe is unblocked. The lifting rope is connected to the topmost sampling box.

[0007] In one possible implementation, the sampling box includes a box body and a box cover, wherein the box body is cylindrical, the top end of the box body is open, the top of the box body is provided with a first connecting section, the outer wall of the first connecting section is provided with a first thread, and the bottom surface of the box body is provided with a plurality of first adjustment holes, and the axis of the first adjustment hole is parallel to the axis of the box body; the box cover is cylindrical, the bottom end of the box cover is open, and the inner wall of the box cover is provided with a second thread, the first thread is adapted to the second thread so that the box cover can be screwed to the first connecting section, and a second adjustment hole is provided on the top end surface of the box cover, and the axis of the second adjustment hole is parallel to the axis of the box cover; one end of the adjusting screw is screwed into the first adjusting hole, and the other end of the adjusting screw is screwed into the second adjusting hole.

[0008] In one possible implementation, the adjusting screw includes an upper screw, a lower screw and a rotating assembly, wherein the top end of the upper screw is screwed into the first adjusting hole; the bottom end of the lower screw is screwed into the second adjusting hole; and the rotating assembly is arranged between the upper screw and the lower screw so that the upper screw and the lower screw can rotate relative to each other.

[0009] In one possible implementation, the rotating assembly includes a rotating box and a rotating plate. The rotating box is fixedly arranged at the top end of the lower screw rod. A cylindrical rotating chamber is provided in the rotating box. A avoidance chamber is provided at the top of the rotating chamber. The diameter of the avoidance chamber is the same as the diameter of the upper screw rod; the rotating plate is fixedly arranged at the bottom end of the upper screw rod. The rotating plate is rotatably arranged in the rotating chamber, and the upper screw rod is inserted into the avoidance chamber. The diameter of the rotating plate is larger than the diameter of the avoidance chamber.

[0010] In a possible implementation, the upper screw is provided with a plurality of first bumps, which are evenly arranged along the circumference of the upper screw; the lower screw is provided with a plurality of second bumps, which are evenly arranged along the circumference of the lower screw.

[0011] In a possible implementation, a receiving plate is provided on the top of the unlocking tube, a plurality of first springs are provided between the receiving plate and the bottom surface of the box, and the sampling bottle is provided on the receiving plate.

[0012] In a possible implementation, a plurality of balancing holes are provided on the box cover.

[0013] In one possible implementation, the locking mechanism includes a locking column, a connecting column and a locking plate, wherein the locking column is arranged in the water inlet pipe, the locking column and the water inlet pipe are coaxially arranged, and the inner diameter of the unlocking tube is larger than the diameter of the locking column; the connecting column is arranged at the bottom end of the locking column, and the bottom end of the connecting column is connected to the inner wall of the water inlet pipe; the locking plate is annular, the inner diameter of the locking plate is the same as the diameter of the locking column, and the inner diameter of the locking plate is larger than the diameter of the connecting column; when the locking mechanism is locked, the locking plate is sleeved on the locking column; when the unlocking tube pushes the locking plate down and causes the locking plate to be sleeved on the connecting column, the locking mechanism is unlocked.

[0014] In one possible implementation, a reset ring is provided at the top of the locking column, a second spring is provided between the reset ring and the locking plate, and when the second spring is in a natural state, the locking plate is sleeved on the locking column; the outer diameter of the unlocking tube is the same as the inner diameter of the water inlet pipe, a first through hole is provided on the bottom surface of the box body, the diameter of the first through hole is the same as the outer diameter of the unlocking tube, a plurality of water inlet holes are provided on the unlocking tube, and when the first spring is in a natural state, the water inlet hole is provided in the box body; and when the sampling bottle is filled with water samples, the water inlet hole is provided at the bottom of the box body.

[0015] In a possible implementation, the stratified sampling device also includes a connecting plate, a plurality of connecting bolts and a connecting ring, wherein the connecting plate is arranged above the topmost sampling box, and a plurality of connecting holes are provided on the connecting plate; a plurality of connecting bolts correspond one-to-one to the connecting holes, the connecting bolts are screwed into the corresponding connecting holes, and the bottom ends of the connecting bolts are screwed into the second adjustment hole of the topmost sampling box; the connecting ring is arranged at the top of the connecting plate, and the hand rope is connected to the connecting ring.

[0016] The beneficial effects of the stratified sampling device provided by the utility model are as follows: compared with the prior art, the utility model provides a sampling box and an adjusting screw provided between adjacent sampling boxes. When the length of the adjusting screw extending into the sampling box is changed, the distance between the sampling boxes can be adjusted. In addition, since a sampling cavity is provided in the sampling box and a sampling bottle is provided in the sampling cavity, it is convenient to sample water at different depths. At the same time, by providing an unlocking tube, a water inlet tube and a locking mechanism, when sampling, the locking mechanism can be unlocked only when the sampling bottle of the upper layer is full, thereby allowing the sampling bottle of the lower layer to start sampling. This also means that when the stratified sampling device of the utility model is put into water, the water of the upper layer will not enter the sampling bottle, thereby preventing the obtained water sample from being contaminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic structural diagram of a stratified sampling device provided in an embodiment of the present utility model;

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

[0020] Figure 3 A schematic structural diagram of a sampling box provided by an embodiment of the present utility model from one angle;

[0021] Figure 4 A schematic structural diagram of the sampling box provided by an embodiment of the utility model from another angle;

[0022] Figure 5 A schematic diagram of the structure of the adjusting bolt provided in an embodiment of the utility model;

[0023] Figure 6 A schematic structural diagram of a rotating assembly provided in an embodiment of the present utility model;

[0024] Figure 7 A longitudinal cross-sectional view of a sampling box provided in an embodiment of the present utility model;

[0025] Figure 8 for Figure 7 Enlarged view of part B.

[0026] Among them, the reference numerals in the figures are as follows:

[0027] 1. Sampling box; 2. Adjusting screw; 3. Sampling bottle; 4. Hand rope;

[0028] 101, sampling chamber; 102, unlocking tube; 103, box body; 104, first connecting section; 105, first adjustment hole; 106, box cover; 107, second adjustment hole; 108, receiving plate; 109, first spring; 110, balancing hole;

[0029] 201, upper screw; 202, lower screw; 203, rotating assembly; 204, rotating box; 205, rotating plate; 206, first protrusion; 207, second protrusion;

[0030] 301, water inlet pipe; 302, locking mechanism; 303, locking column; 304, connecting column; 305, locking plate; 306, reset ring; 307, second spring;

[0031] 401. Connecting plate; 402. Connecting bolt; 403. Connecting ring. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] It should be further explained that the drawings and implementation methods of the present invention mainly describe the concept of the present invention. On the basis of this concept, some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems, etc. The specific forms and settings may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a familiar manner.

[0034] When an element is referred to as being “fixed to” or “disposed on” another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] The directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, and "several" means one or more, unless otherwise specifically defined.

[0037] The stratified sampling device provided by the utility model is now described.

[0038] Please also refer to Figure 1The stratified sampling device includes multiple sampling boxes 1, multiple sampling bottles 3 and a hand rope 4, wherein the sampling boxes 1 are arranged at intervals, and an adjusting screw 2 is connected between each sampling box 1. The adjusting screw 2 can adjust the length of the sampling box 1 by rotation. A sampling cavity 101 is provided inside the sampling box 1, and an unlocking tube 102 is slidably provided in the sampling cavity 101. The bottom end of the unlocking tube 102 extends to the bottom of the sampling box 1. Multiple sampling bottles 3 correspond to the sampling boxes 1 one by one, and the sampling bottles 3 are slidably provided in the sampling cavity 101 of the corresponding sampling box 1. The sample bottle 3 can drive the unlocking tube 102 to slide down as it slides down. A water inlet pipe 301 is provided on the top of the sampling bottle 3. In the two adjacent sampling boxes 1, the unlocking tube 102 of the upper sampling box 1 is inserted into the water inlet pipe 301 of the sampling bottle 3 in the lower sampling box 1. A locking mechanism 302 is provided in the water inlet pipe 301 with the unlocking tube 102 inserted. When the locking mechanism 302 is locked, the water inlet pipe 301 is blocked, and when the unlocking tube 102 slides down, the locking mechanism 302 can be unlocked, the water inlet pipe 301 is unblocked, and the carrying rope 4 is connected to the topmost sampling box 1.

[0039] The beneficial effect of the stratified sampling device provided in this embodiment is as follows: compared with the prior art, the stratified sampling device provided in this embodiment provides a sampling box 1 and an adjusting screw 2 provided between adjacent sampling boxes 1. When the length of the adjusting screw 2 extending into the sampling box 1 is changed, the distance between the sampling boxes 1 can be adjusted. In addition, since a sampling cavity 101 is provided in the sampling box 1, and a sampling bottle 3 is provided in the sampling cavity 101, it is convenient to sample water at different depths. At the same time, by providing an unlocking tube 102, a water inlet pipe 301 and a locking mechanism 302, during sampling, the locking mechanism 302 can be unlocked only when the sampling bottle 3 of the upper layer is full, thereby allowing the sampling bottle 3 of the lower layer to start sampling. This means that when the stratified sampling device of the present invention is put into water, the water in the upper layer will not enter the sampling bottle 3, thereby preventing the obtained water sample from being contaminated.

[0040] Combine Figure 3 、 Figure 4 and Figure 7As shown, the sampling box 1 includes a box body 103 and a box cover 106, wherein the box body 103 is cylindrical, the top end of the box body 103 is open, the top of the box body 103 is provided with a first connecting section 104, the outer wall of the first connecting section 104 is provided with a first thread, and the bottom surface of the box body 103 is provided with a plurality of first adjustment holes 105, the axis of the first adjustment hole 105 is parallel to the axis of the box body 103, the box cover 106 is cylindrical, the bottom end of the box cover 106 is open, the inner wall of the box cover 106 is provided with a second thread, the first thread is adapted to the second thread so that the box cover 106 can be screwed on the first connecting section 104, and a second adjustment hole 107 is provided on the top end face of the box cover 106, the axis of the second adjustment hole 107 is parallel to the axis of the box cover 106, one end of the adjusting screw 2 is screwed in the first adjusting hole 105, and the other end of the adjusting screw 2 is screwed in the second adjusting hole 107.

[0041] In this embodiment, the depth of the first adjustment hole 105 is greater than the depth of the second adjustment hole 107. The adjusting screw 2 is rotated so that the length of the adjusting screw 2 extending into the first adjustment hole 105 can be adjusted, thereby achieving the purpose of adjusting the distance between adjacent sampling boxes 1. The stratified sampling device of the present invention can not only sample water resources at different depths, but also appropriately adjust the sampling depth of each sampling bottle 3 when sampling at different positions.

[0042] like Figure 5 As shown, the adjusting screw 2 includes an upper screw 201, a lower screw 202, and a rotating assembly 203. The top end of the upper screw 201 is threaded into the first adjusting hole 105, and the bottom end of the lower screw 202 is threaded into the second adjusting hole 107. The rotating assembly 203 is disposed between the upper and lower screws 201, 202 to enable relative rotation between the upper and lower screws 201, 202. The provision of the rotating assembly 203 facilitates the threading of the upper screw 201 into the first adjusting hole 105 of the upper sampling box 1, and also facilitates the threading of the lower screw 202 into the second adjusting hole 107 of the lower sampling box 1.

[0043] Specifically in this embodiment, the rotating assembly 203 includes a rotating box 204 and a rotating plate 205. Figure 6 As shown, the rotating box 204 is fixed at the top of the lower screw 202, and a cylindrical rotating chamber is provided in the rotating box 204. A avoidance chamber is provided at the top of the rotating chamber, and the diameter of the avoidance chamber is the same as the diameter of the upper screw 201. The rotating plate 205 is fixed at the bottom end of the upper screw 201, and the rotating plate 205 is rotatably arranged in the rotating chamber, and the upper screw 201 is inserted in the avoidance chamber. The diameter of the rotating plate 205 is larger than the diameter of the avoidance chamber, so that the rotating plate 205 cannot be separated from the rotating chamber, and the upper screw 201 can rotate relative to the lower screw 202.

[0044] As a preferred technical solution, the upper screw rod 201 is provided with a plurality of first protrusions 206, which are evenly arranged along the circumference of the upper screw rod 201. The lower screw rod 202 is provided with a plurality of second protrusions 207, which are evenly arranged along the circumference of the lower screw rod 202. The provision of the first protrusions 206 and the second protrusions 207 can increase the local roughness of the upper screw rod 201 and the lower screw rod 202, thereby facilitating the rotation of the upper screw rod 201 or the lower screw rod 202.

[0045] In this embodiment, a third adjustment hole is provided on the bottle cap of the sampling bottle 3, and the water inlet pipe 301 is screwed on the third adjustment hole, so that the length of the water inlet pipe 301 extending out of the sampling bottle 3 can be adjusted, that is, the length of the water inlet pipe 301 extending out of the sampling box 1 can be adjusted. When the distance between adjacent sampling boxes 1 changes, the length of the water inlet pipe 301 extending out of the sampling box 1 can be changed to match it.

[0046] like Figure 7 As shown, a receiving plate 108 is provided at the top of the unlocking tube 102. Multiple first springs 109 are installed between the receiving plate 108 and the bottom surface of the housing 103. The sampling bottle 3 is placed on the receiving plate 108. The provision of the receiving plate 108 facilitates the gravity of the sampling bottle 3 to drive the unlocking tube 102 downward. The provision of the first springs 109 also allows the receiving plate 108 and the unlocking tube 102 to return to their original position when the sampling bottle 3 is removed.

[0047] In this embodiment, the box cover is provided with a plurality of balancing holes 110. When the sampling bottle 3 is lowered for sampling, the balancing holes 110 allow external water to enter the sampling box 1, thereby facilitating the lowering of the sampling bottle 3.

[0048] like Figure 8 As shown, the locking mechanism 302 includes a locking column 303, a connecting column 304 and a locking plate 305, wherein the locking column 303 is arranged in the water inlet pipe 301, the locking column 303 and the water inlet pipe 301 are coaxially arranged, the inner diameter of the unlocking tube is larger than the diameter of the locking column 303, the connecting column 304 is arranged at the bottom end of the locking column 303, and the bottom end of the connecting column 304 is connected to the inner wall of the water inlet pipe 301, the locking plate 305 is annular, the inner diameter of the locking plate 305 is the same as the diameter of the locking column 303, and the inner diameter of the locking plate 305 is larger than the diameter of the connecting column 304.

[0049] When the locking mechanism 302 is locked, the locking plate 305 is mounted on the locking post 303, with the inner wall of the locking plate 305 abutting against the locking post 303 and the outer wall of the locking plate 305 abutting against the outer wall of the water inlet pipe 301, preventing water from entering under the locking plate 305. When the unlocking tube 102 pushes the locking plate 305 downward and mounts it on the connecting post 304, the locking mechanism 302 is unlocked. At this point, the inner wall of the locking plate 305 is spaced apart from the connecting post 304, allowing water to enter under the locking plate 305 through the gap between the inner wall of the locking plate 305 and the connecting post 304.

[0050] In this embodiment, a reset ring 306 is provided at the top of the locking column 303, and a second spring 307 is provided between the reset ring 306 and the locking plate 305. When the second spring 307 is in a natural state, the locking plate 305 is sleeved on the locking column 303. The arrangement of the second spring 307 and the reset ring 306 enables the locking plate 305 to be reset and block the water inlet pipe 301 when the external force is lost, so as to facilitate the transfer and transportation of the sampling bottle 3 and the water sample inside.

[0051] Furthermore, the outer diameter of the unlocking tube 102 is identical to the inner diameter of the water inlet pipe 301, so that when the unlocking tube 102 is inserted into the water inlet pipe 301, there is no gap between the two, and external water cannot enter the water inlet pipe 301. A first through-hole is provided on the bottom surface of the housing 103, and the diameter of the first through-hole is identical to the outer diameter of the unlocking tube 102. The unlocking tube 102 is provided with multiple water inlet holes. When the first spring 109 is in its natural state, the water inlet holes are located inside the housing 103. When the sampling bottle 3 is filled with water samples, the water inlet holes are located below the housing 103. At this point, due to the descent of the unlocking tube 102, the locking mechanism 302 has been unlocked, allowing external water to enter the unlocking tube 102 through the water inlet holes, then from the unlocking tube 102 into the water inlet pipe 301, and finally into the sampling bottle 3, completing the sampling.

[0052] Finally, if Figure 2 As shown, the stratified sampling device also includes a connecting plate 401, multiple connecting bolts 402, and a connecting ring 403. The connecting plate 401 is positioned above the topmost sampling box 1. Multiple connecting holes are provided on the connecting plate 401, and the multiple connecting bolts 402 correspond one to one with the connecting holes. The connecting bolts 402 are threaded into the corresponding connecting holes, and the bottom ends of the connecting bolts 402 are threaded into the second adjustment holes 107 of the topmost sampling box 1. The connecting ring 403 is positioned at the top of the connecting plate 401, and the hand rope 4 is connected to the connecting ring 403. The arrangement of the connecting plate 401, connecting ring 403, and connecting bolts 402 facilitates the connection of the hand rope 4. Since the water inlet pipe 301 of the sampling bottle 3 in the first layer of sampling box 1, i.e., the topmost sampling box 1, does not have a locking mechanism 302, it can be replaced with a water inlet pipe 301 equipped with a locking mechanism 302 after sampling is completed, thereby preventing the water in the sampling bottle 3 from flowing out.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stratified sampling device, characterized in that: include: A plurality of sampling boxes (1), each of the sampling boxes (1) is arranged at intervals, and an adjusting screw (2) is connected between each of the sampling boxes (1), and the adjusting screw (2) can adjust the length of the sampling box (1) by rotating, and a sampling cavity (101) is provided inside the sampling box (1), and an unlocking tube (102) is slidably provided in the sampling cavity (101), and the bottom end of the unlocking tube (102) extends below the sampling box (1); A plurality of sampling bottles (3) are provided, one-to-one corresponding to the sampling boxes (1), the sampling bottles (3) are slidably arranged in the sampling cavity (101) of the corresponding sampling boxes (1), the sampling bottles (3) can drive the unlocking tube (102) to slide down due to the sliding down, the top of the sampling bottle (3) is provided with a water inlet pipe (301), in two adjacent sampling boxes (1), the unlocking tube (102) of the upper sampling box (1) is inserted into the water inlet pipe (301) of the sampling bottle (3) in the lower sampling box (1), and the water inlet pipe (301) in which the unlocking tube (102) is inserted is provided with a locking mechanism (302), when the locking mechanism (302) is locked, the water inlet pipe (301) is blocked; and when the unlocking tube (102) slides down, the locking mechanism (302) can be unlocked, and the water inlet pipe (301) is unblocked; A hand rope (4) is connected to the uppermost sampling box (1).

2. The stratified sampling device according to claim 1, wherein The sampling box (1) comprises: The box body (103) is cylindrical, the top end of the box body (103) is open, the top end of the box body (103) is provided with a first connecting section (104), the outer wall of the first connecting section (104) is provided with a first thread, and the bottom surface of the box body (103) is provided with a plurality of first adjustment holes (105), the axes of the first adjustment holes (105) are parallel to the axis of the box body (103); The box cover (106) is cylindrical, the bottom end of the box cover (106) is open, a second thread is provided on the inner wall of the box cover (106), the first thread is adapted to the second thread so that the box cover (106) can be screwed onto the first connecting section (104), a second adjustment hole (107) is provided on the top end surface of the box cover (106), and the axis of the second adjustment hole (107) is parallel to the axis of the box cover (106); One end of the adjusting screw (2) is screwed into the first adjusting hole (105), and the other end of the adjusting screw (2) is screwed into the second adjusting hole (107).

3. The stratified sampling device according to claim 2, characterized in that: The adjusting screw (2) comprises: An upper screw rod (201), the top end of which is screwed into the first adjustment hole (105); A lower screw rod (202), the bottom end of which is screwed into the second adjustment hole (107); The rotating assembly (203) is provided between the upper screw rod (201) and the lower screw rod (202), so as to enable the upper screw rod (201) and the lower screw rod (202) to rotate relative to each other.

4. The stratified sampling device according to claim 3, characterized in that: The rotating assembly (203) comprises: A rotating box (204) is fixedly arranged at the top end of the lower screw (202), wherein a columnar rotating chamber is provided in the rotating box (204), and a relief chamber is provided at the top of the rotating chamber, wherein the diameter of the relief chamber is the same as that of the upper screw (201); A rotating plate (205) is fixedly arranged at the bottom end of the upper screw rod (201), the rotating plate (205) is rotatably arranged in the rotating cavity, and the upper screw rod (201) is inserted into the avoidance cavity, and the diameter of the rotating plate (205) is larger than the diameter of the avoidance cavity.

5. The stratified sampling device according to claim 4, wherein: The upper screw rod (201) is provided with a plurality of first protrusions (206), and the first protrusions (206) are evenly arranged along the circumference of the upper screw rod (201); A plurality of second protrusions (207) are provided on the lower screw rod (202), and the second protrusions (207) are evenly arranged along the circumference of the lower screw rod (202).

6. The stratified sampling device according to claim 5, characterized in that: A receiving plate (108) is provided on the top of the unlocking tube (102), a plurality of first springs (109) are provided between the receiving plate (108) and the bottom surface of the box body (103), and the sampling bottle (3) is provided on the receiving plate (108).

7. The stratified sampling device according to claim 6, characterized in that: The box cover is provided with a plurality of balancing holes (110).

8. The stratified sampling device according to claim 7, characterized in that: The locking mechanism (302) comprises: A locking column (303) is provided in the water inlet pipe (301), the locking column (303) and the water inlet pipe (301) are coaxially arranged, and the inner diameter of the unlocking tube is larger than the diameter of the locking column (303); A connecting column (304) is provided at the bottom end of the locking column (303), and the bottom end of the connecting column (304) is connected to the inner wall of the water inlet pipe (301); A locking plate (305) is annular, and the inner diameter of the locking plate (305) is the same as the diameter of the locking column (303), and the inner diameter of the locking plate (305) is larger than the diameter of the connecting column (304); When the locking mechanism (302) is locked, the locking plate (305) is sleeved on the locking column (303); when the unlocking tube (102) pushes the locking plate (305) downward and causes the locking plate (305) to be sleeved on the connecting column (304), the locking mechanism (302) is unlocked.

9. The stratified sampling device according to claim 8, wherein: A reset ring (306) is provided at the top of the locking column (303), a second spring (307) is provided between the reset ring (306) and the locking plate (305), and when the second spring (307) is in a natural state, the locking plate (305) is sleeved on the locking column (303); The outer diameter of the unlocking tube (102) is the same as the inner diameter of the water inlet pipe (301), and a first through hole is provided on the bottom surface of the box body (103). The diameter of the first through hole is the same as the outer diameter of the unlocking tube (102). The unlocking tube (102) is provided with a plurality of water inlet holes. When the first spring (109) is in a natural state, the water inlet holes are provided in the box body (103); and when the sampling bottle (3) is filled with water samples, the water inlet holes are provided below the box body (103).

10. The stratified sampling device according to claim 9, characterized in that: Also includes: A connecting plate (401) is provided above the uppermost sampling box (1), and a plurality of connecting holes are provided on the connecting plate (401); A plurality of connecting bolts (402) corresponding to the connecting holes one by one, the connecting bolts (402) being screwed into the corresponding connecting holes, and the bottom ends of the connecting bolts (402) being screwed into the second adjustment hole (107) of the uppermost sampling box (1); A connecting ring (403) is provided on the top of the connecting plate (401), and the hand rope (4) is connected to the connecting ring (403).

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