A stratified sampling device for water quality monitoring

Abstract

The present invention relates to the technical field of sampling devices, specifically to a layered sampling device for water quality monitoring, comprising a plurality of sampling tubes, two adjacent sampling tubes being detachably connected, a water inlet hole being provided on the sampling tube; a sliding sleeve being slidably provided on the outer side of the sampling tube, a sliding block being slidably connected inside the sampling tube, a connecting rod being fixedly connected to the inner wall of the sliding sleeve, the connecting rod passing through the sampling tube and being fixedly connected to the sliding block, a retaining ring being fixedly connected below the sliding block, a through hole being provided on the retaining ring, and an elastic connection between the sliding block and the sampling tube; a filter being installed inside the sampling tube, and a liquid passing through the filter after entering the sampling tube achieves a solid-liquid separation effect. In the process of the sampling tube entering into water or being taken out of water, the sliding sleeve is closed by the pressure of water so as to avoid mixing of the sampling tube with different depths when entering water, thereby improving the accuracy of detecting the sampling material inside the sampling tube.

Description

Technical Field

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

[0002] Water quality monitoring is the process of monitoring and measuring the types of pollutants in water bodies, the concentrations of various pollutants and their changing trends, and evaluating the water quality status. The monitoring scope is very wide, including regular surface and groundwater monitoring, surveillance of production and living processes, and emergency accident monitoring. Therefore, water quality sampling is an important part of water quality monitoring.

[0003] In the patent with authorization announcement number CN219589992U, a stratified sampling device for water quality monitoring is disclosed, including a sleeve, a sampling barrel is slidably connected to the bottom of the inner side of the sleeve, an external threaded sleeve is fixedly connected to the lower surface of the sampling barrel, an internal threaded sleeve is fixedly connected to the upper surface of the sampling barrel, and a sealing ring is fixedly connected to the top of the inner side of the sampling barrel; adjacent sampling barrels of the sampling device are threadedly connected to the inside of the internal threaded sleeve through the external threaded sleeve, which is convenient for replacement and maintenance, and for taking out samples after sampling, and is also convenient for cleaning, so as to avoid residual samples affecting the next sampling test, and to facilitate stratification during sampling, with good stratification effect, avoiding mutual mixing, and improving the accuracy of detection. However, after the sampling device enters the water, water will immediately enter the sampling tube through the water inlet hole, the water inlet pipe, the filter plug and the connecting pipe, resulting in that when the sampling tube enters the deep water area, the water in the shallow water layer has begun to slowly enter the sampling tube. After the sampling tube moves to the deep water area, since there is already liquid in the sampling tube, the water in the deep water area and the shallow water area are mixed, thereby reducing the accuracy of water detection. In addition, after the water is sampled, there will be impurities in the water, and the water needs to be filtered twice, which is time-consuming and labor-intensive. Therefore, the present invention provides a stratified sampling device for water quality monitoring to solve the above problems. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a stratified sampling device for water quality monitoring to solve the problem in the prior art that the sampling tube passes through the shallow water layer when entering the deep water area, resulting in liquid in the sampling tube, causing the water in the deep water area and the shallow water area to mix, thereby reducing the accuracy of water detection.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A water quality monitoring layered sampling device comprises a plurality of sampling tubes, two adjacent sampling tubes are detachably connected, a water inlet hole is provided on the sampling tube, and the sampling tube has a one-way opening and the opening is located below the sampling tube;

[0007] A sliding sleeve is slidably provided on the outer side of the sampling barrel, a sliding block is slidably connected to the inside of the sampling barrel, a connecting rod is fixedly connected to the inner wall of the sliding sleeve, the connecting rod passes through the sampling barrel and is fixedly connected to the sliding block, a retaining ring is fixedly connected below the sliding block, the retaining ring is fitted with the inner wall of the sampling barrel, a through hole corresponding to the water inlet hole is opened on the retaining ring, and the sliding block is elastically connected to the sampling barrel;

[0008] A filter is installed inside the sampling cylinder, and the filter is located below the sliding block. After the liquid enters the sampling cylinder, it passes through the filter to achieve the effect of solid-liquid separation.

[0009] Preferably, a slide groove is provided on the sampling tube, the connecting rod is located in the slide groove, and the length of the sliding sleeve is greater than the length of the slide groove.

[0010] Preferably, the filter element includes a support ring, a base plate and a support rod, the base plate and the support ring are connected by the support rod, the base plate is located below the support ring, the middle part of the support ring has a filter, the support ring fits on the inner wall of the sampling barrel, the base plate is installed on the inner wall of the sampling barrel, a drain port is opened on the base plate, a switch unit is arranged inside the drain port, and the switch unit is used to realize opening or closing of the drain port.

[0011] Preferably, the switch unit includes a pressure ring, a plug and a fixed sleeve, the inside of the pressure ring is fixedly connected to a first support frame, a fixing rod penetrating the fixing sleeve is fixedly connected between the first support frame and the plug, the fixing rod elastically slides in the fixing sleeve, the outer side of the fixing sleeve is fixedly connected to a second support frame, the second support frame is fixedly connected in the drain port, the drain port is conical in shape, the plug is located at the drain port and is adapted to the shape of the drain port.

[0012] Preferably, the pressure ring is provided with a rectangular groove, and a positioning groove corresponding to the pressure ring is provided below the bottom plate.

[0013] Preferably, a one-way valve located on the sampling cylinder is provided between the support ring and the bottom plate.

[0014] Preferably, a threaded rod is fixedly connected to the middle of the sampling tube, a stirring fan is rotatably arranged below the sliding block, the threaded rod passes through the sliding block and the stirring fan in sequence, and the threaded rod is threadably connected to the stirring fan.

[0015] Preferably, the sampling barrel has a thread groove on the top, and thread teeth are arranged on the bottom of the sampling barrel. The thread teeth cooperate with the thread groove. A groove is provided in the middle of the top of the sampling barrel, and the pressure ring corresponds to the groove.

[0016] Preferably, a limiting groove is provided above the sliding sleeve, and a limiting rod is fixedly connected to the bottom of the sliding sleeve. The end of the limiting rod away from the sliding sleeve is T-shaped, the limiting rod is located in the limiting groove and adapted to the limiting groove, one end of the limiting groove has an inlet, and the limiting groove is threaded.

[0017] Preferably, a pressure plate is fixedly connected to the outer side of the sliding sleeve.

[0018] The beneficial effects of the present invention are:

[0019] 1. When the sampling tube enters the water or is taken out of the water, the sliding sleeve uses the water pressure to make the through hole and the water inlet hole dislocated and closed, thereby avoiding the mixing of the sampling tube with different depths when entering the water, and improving the accuracy of the detection of the sampled material inside the sampling tube. At the same time, when the sampling tube rises, the sliding block descends, and then the filter element quickly filters the liquid, thereby achieving the effect of solid-liquid separation.

[0020] 2. The downward movement of the sliding block can apply pressure to the screening chamber, allowing the liquid to pass through the filter quickly. When there are too many solids on the filter, the stirring fan is rotated through the cooperation of the stirring fan and the threaded rod, thereby stirring up the solids in the filter to avoid clogging of the filter holes and slow filtering effect.

[0021] 3. Push the pressure ring upward so that the fixed rod drives the blockage to open the drain port to facilitate the discharge of the liquid in the liquid storage chamber. The pressure ring is provided with a rectangular groove to facilitate the rotation of the sampling tube, so that two adjacent sampling tubes are separated, which is convenient for removing the solids on the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the sampling device of the present invention.

[0023] Figure 2 It is a schematic diagram of the cross-sectional structure of the sampling tube of the present invention.

[0024] Figure 3 This is a schematic structural diagram of the sampling tube of the present invention from a first viewing angle.

[0025] Figure 4 This is a schematic structural diagram of the sampling tube of the present invention from a second viewing angle.

[0026] Figure 5 It is a schematic structural diagram of the sliding sleeve of the present invention.

[0027] Figure 6 It is a structural schematic diagram of the sliding block of the present invention.

[0028] Figure 7 It is a schematic structural diagram of the filter element of the present invention.

[0029] Figure 8 It is a partial cross-sectional schematic diagram of the base plate of the present invention.

[0030] In the figure: 1, sampling tube; 2, sliding sleeve; 3, sliding block; 4, filter element; 5, mounting column; 6, conical head; 11, water inlet hole; 12, groove; 13, slide groove; 14, threaded groove; 15, threaded teeth; 16, threaded rod; 17, one-way valve; 21, pressure plate; 22, connecting rod; 23, limit rod; 24, limit groove; 31, retaining ring; 32, through hole; 33, stirring fan; 34, first elastic member; 41, support ring; 42, bottom plate; 43, support rod; 44, pressure ring; 45, fixing sleeve; 46, fixing rod; 47, plug; 411, filter screen; 421, drain port; 422, positioning groove; 441, rectangular groove; 442, first support frame; 451, second support frame; 452, second elastic member; 461, baffle; 51, handle. DETAILED DESCRIPTION

[0031] The following will refer to the attached Figures 1 to 8 The embodiments of the present invention are described in detail. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0032] A water quality monitoring stratified sampling device, as shown in the attached Figures 1 to 8 As shown, it includes a plurality of sampling barrels 1, which can sample water quality at different depths at the same time. Two adjacent sampling barrels 1 can be detachably connected. Specifically, the upper portion of the sampling barrel 1 is provided with a thread groove 14, and the lower portion of the sampling barrel 1 is provided with thread teeth 15. The thread teeth 15 are used in conjunction with the thread groove 14. The cooperation between the thread teeth 15 and the thread groove 14 can facilitate the installation or removal of two adjacent sampling barrels 1. The sampling barrel 1 is provided with a water inlet hole 11. The sampling barrel 1 has a one-way opening and the direction of the opening is located below the sampling barrel 1. The uppermost sampling barrel 1 is threadedly mounted with a mounting column 5, and a handle 51 is fixedly connected to the mounting column 5. The handle 51 facilitates the insertion and removal of the sampling barrel 1. The lowermost sampling barrel 1 is threadedly mounted with a conical head 6, and the conical head 6 can reduce the resistance of the sampling barrel 1 entering the water.

[0033] The outer side of the sampling tube 1 is slidably provided with a sliding sleeve 2, and the outer side of the sliding sleeve 2 is fixedly connected with a pressure plate 21. The pressure plate 21 can increase the force area between the liquid and the sliding sleeve 2, so that the sliding sleeve 2 moves and reacts more quickly. The inside of the sampling tube 1 is slidably connected with a sliding block 3, and the inner wall of the sliding sleeve 2 is fixedly connected with a connecting rod 22. The connecting rod 22 penetrates the sampling tube 1 and is fixedly connected with the sliding block 3. In detail, a slide groove 13 is provided on the sampling tube 1, and the connecting rod 22 is located in the slide groove 13. The length of the sliding sleeve 2 is greater than the length of the slide groove 13, which can prevent the sliding sleeve 2 from exposing the slide groove 13 after moving, thereby ensuring the sealing between the sliding sleeve 2 and the sampling tube 1. A retaining ring 31 is fixedly connected below the sliding block 3, and the retaining ring 31 is in contact with the inner wall of the sampling tube 1. The retaining ring 31 is provided with a through hole 32 corresponding to the water inlet hole 11, and the sliding block 3 is elastically connected to the sampling tube 1. In detail, a first elastic member 34 is fixedly connected between the sliding block 3 and the inner wall of the sampling tube 1. The first elastic member 34 can be an elastic structure such as a spring or a rubber column. The sliding block 3 can automatically reset after the sliding block 3 moves. A filter 4 is installed inside the sampling tube 1. The filter 4 is located below the sliding block 3. After the liquid enters the sampling tube 1, it passes through the filter 4 to achieve the effect of solid-liquid separation.

[0034] Specifically, when the sampling tube 1 enters or is taken out of the water, the sliding sleeve 2 uses the water pressure to make the through hole 32 and the water inlet hole 11 misaligned and in a closed state, thereby avoiding the mixing of the sampling tube 1 with different depths when entering the water, and improving the accuracy of the detection of the sampled material inside the sampling tube 1. At the same time, when the sampling tube 1 rises, the sliding block 3 descends, and then the filter element 4 quickly filters the liquid, thereby achieving the effect of solid-liquid separation.

[0035] like Figure 7 and Figure 8 As shown, the filter element 4 includes a support ring 41, a bottom plate 42 and a support rod 43. The bottom plate 42 and the support ring 41 are connected by the support rod 43. The bottom plate 42 is located below the support ring 41. The middle part of the support ring 41 has a filter screen 411. The filter screen 411 can be arc-shaped or conical to prevent the liquid from flowing to the edge of the support ring 41. A screening cavity is formed between the sliding block 3 and the filter screen 411. The support ring 41 is attached to the inner wall of the sampling tube 1. The bottom plate 42 is installed on the inner wall of the sampling tube 1. A liquid storage cavity is formed between the bottom plate 42, the filter screen 411 and the sampling tube 1. A drain port 421 is provided on the bottom plate 42. A switch unit is provided inside the drain port 421. The switch unit is used to open or close the drain port 421.

[0036] Specifically, after the liquid enters the sampling tube 1 through the water inlet 11 and the through hole 32, the liquid is separated into solid and liquid under the action of the filter screen 411. The solid will be retained on the filter screen 411, and the liquid will flow into the liquid storage cavity, avoiding the situation where the solid-liquid mixing requires secondary separation.

[0037] The switch unit includes a pressure ring 44, a plug 47 and a fixed sleeve 45. The pressure ring 44 is fixedly connected to the inside with a first support frame 442. A fixed rod 46 that penetrates the fixed sleeve 45 is fixedly connected between the first support frame 442 and the plug 47. The fixed rod 46 elastically slides in the fixed sleeve 45. In detail, a baffle 461 is fixedly connected to the fixed rod 46. The baffle 461 is located in the fixed sleeve 45. The upper and lower sides of the baffle 461 are respectively fixedly connected to the fixed sleeve 45 with a second elastic member 452. The second elastic member 452 is a spring. The second elastic member 452 can automatically reset the plug 47 after moving, and close the drain port 421. The outer side of the fixed sleeve 45 is fixedly connected with a second support frame 451. The second support frame 451 is fixedly connected in the drain port 421. The drain port 421 is in a cone shape. The plug 47 is located in the drain port 421 and is adapted to the shape of the drain port 421.

[0038] Specifically, the pressure ring 44 is pushed upward, so that the fixing rod 46 drives the plug 47 to open the liquid discharge port 421 to facilitate the discharge of the liquid in the liquid storage chamber.

[0039] The pressure ring 44 is provided with a rectangular groove 441, which facilitates the rotation of the sampling tube 1, so that two adjacent sampling tubes 1 are separated, and it is convenient to remove the solid on the filter screen 411. A positioning groove 422 corresponding to the pressure ring 44 is provided under the bottom plate 42. On the one hand, the positioning groove 422 can facilitate the up and down movement of the pressure ring 44, and on the other hand, it can limit the pressure ring 44 and the bottom plate 42, so as to drive the sliding sleeve 2 to rotate, so that two adjacent sampling tubes 1 are separated.

[0040] like Figure 2 , Figure 4 and Figure 6 As shown, a threaded rod 16 is fixedly connected to the middle of the interior of the sampling barrel 1, and the threaded rod 16 is arranged along the length direction of the sampling barrel 1. A stirring fan 33 is rotatably arranged below the sliding block 3. In detail, the stirring fan 33 and the sliding block 3 are connected by a bearing. The threaded rod 16 passes through the sliding block 3 and the stirring fan 33 in sequence, and the threaded rod 16 is threadedly connected to the stirring fan 33. A one-way valve 17 located on the sampling barrel 1 is arranged between the support ring 41 and the bottom plate 42. The one-way valve 17 can reduce the pressure inside the liquid storage chamber to prevent the sliding block 3 from being unable to descend due to resistance. A groove 12 is opened in the middle of the upper part of the sampling barrel 1, and the pressure ring 44 corresponds to the groove 12. The groove 12 can facilitate the placement of the pressure ring 44.

[0041] Specifically, the downward movement of the sliding block 3 can apply pressure to the screening chamber, allowing the liquid to quickly pass through the filter 411. When there are too many solids on the filter 411, the stirring fan 33 rotates through the cooperation of the stirring fan 33 and the threaded rod 16, thereby stirring up the solids in the filter 411 to avoid clogging of the filter holes of the filter 411 and causing slow filtering effect.

[0042] like Figure 2 and Figure 5 As shown, a limiting groove 24 is provided above the sliding sleeve 2, and a limiting rod 23 is fixedly connected to the bottom of the sliding sleeve 2. The end of the limiting rod 23 away from the sliding sleeve 2 is T-shaped. The limiting rod 23 is located in the limiting groove 24 and is adapted to the limiting groove 24. The cooperation between the limiting rod 23 and the limiting groove 24 can make the two adjacent sliding sleeves 2 move synchronously, avoiding the pressure difference of the water depth causing some water inlet holes 11 to be in an open state. In detail, there are two limiting grooves 24 and two limiting rods 23, which can increase the stability between the two adjacent pressure plates 21. One end of the limiting groove 24 has an inlet, and the limiting groove 24 is threaded. The limiting rod 23 can adjust the distance between the two adjacent sliding sleeves 2 according to the threaded installation method between the two adjacent sampling tubes 1, avoiding the length of the limiting rod 23 causing the two adjacent sliding sleeves 2 to be unable to connect.

[0043] Working principle of the present invention:

[0044] The sampling tube 1 moves the sliding sleeve 2 into the water through the handle 51 on the mounting column 5. When the sampling tube 1 enters the water, the sliding sleeve 2 moves upward under the water pressure. The sliding sleeve 2 drives the sliding block 3 to move upward through the connecting rod 22. The first elastic member 34 is compressed. At the same time, the sliding block 3 drives the retaining ring 31 to move upward, so that the water inlet hole 11 and the through hole 32 are misaligned, so that the water inlet hole 11 is in a closed state.

[0045] When the sampling tube 1 moves to a preset water depth, the sliding sleeve 2 stops moving, and the first elastic member 34 slowly resets, so that the retaining ring 31 on the sliding block 3 moves downward, thereby making the through hole 32 correspond to the water inlet hole 11, and the water inlet hole 11 is in an open state, and the liquid enters the screening chamber through the water inlet hole 11, and the liquid contacts the filter screen 411, thereby achieving solid-liquid separation in the liquid;

[0046] After the sampling is completed, the sampling tube 1 rises, and the sliding sleeve 2 drives the sliding sleeve 2 to move downward under the water pressure. The sliding sleeve 2 drives the retaining ring 31 on the sliding block 3 to move downward through the connecting rod 22, so that the through hole 32 and the water inlet hole 11 are misaligned, and the water inlet hole 11 is in a closed state, so as to avoid the mixing of liquids of different depths and cause inaccurate detection of the liquid;

[0047] At the same time, when the sliding block 3 descends, the sliding block 3 pressurizes the screening chamber, so that the liquid in the screening chamber passes through the filter screen 411 faster and enters the liquid storage chamber. At this time, the stirring fan 33 on the sliding block 3 rotates under the action of the threaded rod 16, thereby stirring the solid on the filter screen 411 to avoid excessive solids on the filter screen 411 causing the filtering effect of the filter screen 411 to be reduced. When the pressure inside the liquid storage chamber is too high, the one-way valve 17 is used to reduce the pressure in the liquid storage chamber.

[0048] When collecting the liquid inside the liquid storage chamber, first press the pressure ring 44 against the bottle mouth of the collection bottle, and the opening of the pressure ring 44 corresponds to the bottle mouth of the collection bottle, then press the sampling tube 1, and the plug 47 moves upward, so that the discharge port 421 is in an open state, thereby discharging the liquid in the liquid storage chamber. At this time, the pressure ring 44 is rotated through the rectangular groove 441 on the pressure ring 44, and the pressure ring 44 drives the bottom plate 42 to rotate, thereby removing the filter screen 411 from the sampling tube 1, so as to facilitate the detection of the solid on the filter screen 411.

[0049] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A water quality monitoring stratified sampling device, comprising a plurality of sampling tubes (1), characterized in that: Two adjacent sampling tubes (1) are detachably connected, a water inlet hole (11) is provided on the sampling tube (1), and the sampling tube (1) has a one-way opening, and the opening is located below the sampling tube (1); A sliding sleeve (2) is slidably provided on the outer side of the sampling tube (1), a sliding block (3) is slidably connected to the interior of the sampling tube (1), a connecting rod (22) is fixedly connected to the inner wall of the sliding sleeve (2), the connecting rod (22) passes through the sampling tube (1) and is fixedly connected to the sliding block (3), a retaining ring (31) is fixedly connected below the sliding block (3), the retaining ring (31) is in contact with the inner wall of the sampling tube (1), a through hole (32) corresponding to the water inlet hole (11) is formed on the retaining ring (31), and the sliding block (3) is elastically connected to the sampling tube (1); A filter (4) is installed inside the sampling cylinder (1), and the filter (4) is located below the sliding block (3). After the liquid enters the sampling cylinder (1), it passes through the filter (4) to achieve a solid-liquid separation effect; The filter element (4) comprises a support ring (41), a bottom plate (42) and a support rod (43); the bottom plate (42) and the support ring (41) are connected via the support rod (43); the bottom plate (42) is located below the support ring (41); a filter screen (411) is provided in the middle of the support ring (41); the support ring (41) is attached to the inner wall of the sampling tube (1); the bottom plate (42) is mounted on the inner wall of the sampling tube (1); a liquid discharge port (421) is provided on the bottom plate (42); a switch unit is provided inside the liquid discharge port (421); the switch unit is used to open or close the liquid discharge port (421); The switch unit comprises a pressure ring (44), a plug (47) and a fixed sleeve (45); the pressure ring (44) is provided with a rectangular groove (441); a positioning groove (422) corresponding to the pressure ring (44) is provided below the bottom plate (42); a first support frame (442) is fixedly connected inside the pressure ring (44); a fixing rod (46) penetrating the fixing sleeve (45) is fixedly connected between the first support frame (442) and the plug (47); the fixing rod (46) elastically slides in the fixing sleeve (45); a second support frame (451) is fixedly connected to the outside of the fixing sleeve (45); the second support frame (451) is fixedly connected in the drainage port (421); the drainage port (421) is in a cone shape; the plug (47) is located at the drainage port (421) and is adapted to the shape of the drainage port (421); A one-way valve (17) located on the sampling tube (1) is arranged between the support ring (41) and the bottom plate (42); a threaded rod (16) is fixedly connected to the middle of the interior of the sampling tube (1); a stirring fan (33) is rotatably arranged below the sliding block (3); the threaded rod (16) passes through the sliding block (3) and the stirring fan (33) in sequence; and the threaded rod (16) is threadedly connected to the stirring fan (33); The sampling tube (1) has a thread groove (14) on the top, and thread teeth (15) are arranged on the bottom of the sampling tube (1). The thread teeth (15) are used in conjunction with the thread groove (14). A groove (12) is provided in the middle of the top of the sampling tube (1), and the pressure ring (44) corresponds to the groove (12). A limiting groove (24) is provided above the sliding sleeve (2), and a limiting rod (23) is fixedly connected to the bottom of the sliding sleeve (2). The end of the limiting rod (23) away from the sliding sleeve (2) is T-shaped. The limiting rod (23) is located in the limiting groove (24) and is adapted to the limiting groove (24). One end of the limiting groove (24) has an inlet, and the limiting groove (24) is threaded.

2. A water quality monitoring stratified sampling device according to claim 1, characterized in that: The sampling tube (1) is provided with a slide groove (13), the connecting rod (22) is located in the slide groove (13), and the length of the sliding sleeve (2) is greater than the length of the slide groove (13).

3. A water quality monitoring stratified sampling device according to claim 1, characterized in that: A pressure plate (21) is fixedly connected to the outer side of the sliding sleeve (2).

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