A multi-point sampling device for water quality detection based on environmental protection

Abstract

The present invention discloses a multi-point sampling device for water quality detection based on environmental protection in the technical field of water quality detection sampling, including a delivery group, a fixed rod, and a plurality of sampling devices vertically arranged on the fixed rod. The delivery group is used to connect with the fixed rod after the fixed rod enters the water. In the present invention, through the setting of a plurality of shells, when sampling, the water source in waters at different heights is pumped into the interior of the shell by the downward sliding of the extraction plate, and the water sources during the continuous extraction process when the extraction plate descends can be mixed, rather than a single sample at a single time, so as to obtain a uniform sample of the water source at this height. During the process when the extraction plate contacts the frame and pushes the frame to descend, the mixed water source inside the shell will enter the cavity and the interior of the test tube, so that the sample directly enters the test tube and the final sample is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality detection sampling, and particularly to a multi-point sampling device for water quality detection based on environmental protection. Background Art

[0002] Water is the source of life. Humans are inseparable from water in their life and production activities. The quality of domestic drinking water is closely related to human health. With the development of social economy, scientific progress, and the improvement of people's living standards, people's requirements for the quality of domestic drinking water are constantly increasing, and the drinking water quality standards are also continuously developing and improving accordingly. Usually, a multi-point sampling device for water quality detection is used to sample and detect the suspended matter in different heights of the same water source to ensure the quality of drinking water;

[0003] Such as Figure 1 As shown, the existing sampling devices mostly sample through the cooperation of multiple sampling cylinders arranged up and down and baffles. The sampling process is to fix the baffle and the sampling cylinder at a certain height in the water, and then separate the baffle and the sampling cylinder relatively, so that the water at a certain height of the water source can enter the sampling cylinder. Although it can ensure no cross-flow, during use, after the baffle and the sampling cylinder are separated, the water entering the sampling cylinder will squeeze out the air inside the sampling cylinder and generate bubbles. Sampling is to detect the suspended matter at different heights of the water source, and the distribution of suspended matter at different heights is different. When the bubbles are discharged, the suspended matter above will be disordered, resulting in changes in the suspended matter at different heights, thus affecting the sampling accuracy. Moreover, after sampling with the existing sampling cylinder, the sample inside the sampling cylinder still needs to be poured into a test tube for inspection, and the process is cumbersome and inefficient. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-point sampling device for water quality detection based on environmental protection to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A multi-point sampling device for water quality detection based on environmental protection, comprising a delivery group, a fixed rod, and a plurality of sampling devices vertically arranged on the fixed rod. The delivery group is used to connect with the fixed rod after the fixed rod enters the water. The sampling device includes a housing. Both the left and right sides of the housing communicate with the outside. Inside the housing, there is a U-shaped frame. A chute is provided on the inner wall of the housing. The frame is slidably connected to the chute, and a driving spring is fixedly connected between the bottom end of the frame and the inner bottom wall of the housing. A draw plate is slidably connected inside the housing. The top end of the draw plate extends above the housing. A driving group is provided on one side of the draw plate. The driving group is used to control the lifting of the draw plate. The draw plate is arranged at a position higher than the frame. A through hole communicating with the outside is provided on the housing. Cavities are provided on both the left and right side walls of the frame. A placement plate is slidably connected inside each cavity. A placement groove is provided on the placement plate. A test tube is arranged inside the placement groove. The placement plate is slidably connected to the inner wall of the cavity. The placement plate is slidably connected with a top piece. A first spring is fixedly connected between the top end of the top piece and the inner wall of the placement plate. A support rod is rotatably connected to the top piece. The bottom end of the support rod is rotatably connected to a movable plate. The movable plate is rotatably connected to the side wall of the housing. When the movable plate rotates to fit with the housing, it can seal the housing. A driving frame is provided below the movable plate. The driving frame can slide up and down relative to the fixed rod, thereby rotating the movable plate from horizontal to vertical.

[0007] As a further solution of the present invention, sealing groups are provided inside the cavities;

[0008] The sealing group includes sealing pieces arranged on both sides of the test tube and a transition surface provided on the side wall of the cavity. The sealing pieces are slidably connected to the top end of the placement plate. Second springs are fixedly connected between the inner walls of the sealing pieces and the top end of the placement plate. When the sealing pieces rise along with the placement plate, their ends will contact the transition surface and be pushed by the transition surface to move along the placement plate.

[0009] As a further solution of the present invention, columns are provided directly above the test tubes. The diameter of the columns is smaller than the inner diameter of the test tubes. The columns are fixedly connected to the inner wall of the housing.

[0010] As a further solution of the present invention, a driving piece is slidably connected to the bottom end of the frame. The driving piece is U-shaped and its left and right ends are wedge-shaped. A third spring is fixedly connected between the driving piece and the bottom of the frame. Positioning rods are provided on both sides of the driving piece. The positioning rods are slidably connected to positioning holes. The positioning holes are provided on the inner wall of the housing. The positioning rods are slidably connected to the bottom of the frame. Fourth springs are fixedly connected between the positioning rods and the inner wall of the frame.

[0011] As a further solution of the present invention, the driving group includes a cylinder, the cylinder is embedded inside the housing, and the top end of the cylinder is fixedly connected to the extraction plate.

[0012] As a further solution of the present invention, the driving frames are fixedly connected with a connecting rod in common, and the connecting rod is slidably connected to the fixed rod.

[0013] As a further solution of the present invention, the feeding group includes a connecting piece, the connecting piece is fixedly connected to the top end of the uppermost housing, threaded jacks are arranged on the connecting piece, and through holes are formed in the connecting piece.

[0014] As a further solution of the present invention, a filter cover is arranged above the through hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. In the present invention, through the arrangement of multiple housings, when sampling, the water source in waters at different heights is pumped into the housing by the downward sliding of the extraction plate, and the water sources during the continuous extraction process when the extraction plate descends can be mixed, rather than a single sample at a single time, so as to obtain a uniform sample of the water source at this height. When the extraction plate contacts the frame and pushes the frame to descend, the mixed water source inside the housing will enter the cavity and the inside of the test tube, so that the sample directly enters the test tube and the final sample is obtained. Then, when the test tube is taken out later, it can be directly sent for inspection without having to load the taken sample into the test tube again. Moreover, during the sampling process, it is possible to avoid the disorder of the water source and suspended matter at this height caused by air bubbles.

[0017] 2. When the extraction plate descends to the limit, the driving group will control the extraction plate to rise. At this time, the frame and the placement plate will also rise and reset, and the top end of the test tube will fit with the inner top wall of the housing again, so that the water source inside the test tube will not be mixed with the water source inside the cavity. Because during the process of taking out the fixed rod and the housing from the water surface after the sampling work is completed, the suspended matter inside the cavity will precipitate from the upper layer to the lower layer. If the test tube is in an unclosed state, although the suspended matter in the test tube will precipitate to the lower layer of the water source in the test tube, if the fixed rod and the housing shake, it is easy for the suspended matter inside the test tube to flow into the cavity, thus changing the sampled sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the traditional sampling cylinder of the present invention in contact with the baffle;

[0019] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 3 It is a side view of the housing of the present invention;

[0021] Figure 4Side view of the frame and the movable plate of the present invention;

[0022] Figure 5 Schematic diagram of the chute and the positioning hole of the present invention;

[0023] Figure 6 Schematic diagram of the positional relationship among the frame, the driving piece and the sealing piece of the present invention;

[0024] Figure 7 Schematic diagram of the positional relationship between the sealing piece and the second spring of the present invention;

[0025] Figure 8 Schematic diagram of the positional relationship between the top piece and the placement plate of the present invention;

[0026] Figure 9 Schematic diagram of the positional relationship among the housing, the connecting piece and the fixing rod of the present invention;

[0027] Figure 10 is Figure 9 Partial enlarged view of the A position in

[0028] Figure 11 Schematic diagram of the positional relationship among the fixing rod, the connecting rod and the driving frame of the present invention.

[0029] In the attached drawings, the annotations of each reference numeral are as follows:

[0030] 1. Fixing rod; 2. Housing; 3. Chute; 4. Frame; 5. Drawer plate; 6. Through hole; 7. Cavity; 8. Placement plate; 9. Placement groove; 10. Test tube; 11. Top piece; 12. First spring; 13. Support rod; 14. Movable plate; 15. Driving frame; 16. Sealing piece; 17. Transition surface; 18. Second spring; 19. Column; 20. Driving piece; 21. Third spring; 22. Positioning hole; 23. Fourth spring; 24. Cylinder; 25. Connecting rod; 26. Connecting piece; 27. Threaded jack; 28. Perforation; 29. Filter cover; 30. Positioning rod; 31. Driving spring. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1 - 11, the present invention provides a technical solution: a multi-point sampling device for water quality detection based on environmental protection, including a delivery group, a fixed rod 1, and a plurality of sampling devices vertically arranged on the fixed rod 1. The delivery group is used to connect with the fixed rod 1 after the fixed rod 1 enters the water. The sampling device includes a housing 2, both the left and right sides of the housing 2 communicate with the outside, a U-shaped frame 4 is arranged inside the housing 2, a chute 3 is opened on the inner wall of the housing 2, the frame 4 is slidably connected with the chute 3, and a driving spring 31 is fixedly connected between the bottom end of the frame 4 and the inner bottom wall of the housing 2. A draw plate 5 is slidably connected inside the housing 2, the top end of the draw plate 5 extends above the housing 2, a driving group is arranged on one side of the draw plate 5, the driving group is used to control the lifting of the draw plate 5, the position of the draw plate 5 is higher than that of the frame 4, a through hole 6 communicating with the outside is opened on the housing 2, cavities 7 are opened on both the left and right side walls of the frame 4, a placement plate 8 is slidably connected inside each cavity 7, a placement groove 9 is opened on the placement plate 8, a test tube 10 is arranged inside the placement groove 9, the placement plate 8 is slidably connected with the inner wall of the cavity 7, the placement plate 8 is slidably connected with a top piece 11, a first spring 12 is fixedly connected between the top end of the top piece 11 and the inner wall of the placement plate 8, a support rod 13 is rotatably connected to the top piece 11, the bottom end of the support rod 13 is rotatably connected to a movable plate 14, the movable plate 14 is rotatably connected to the side wall of the housing 2, and after the movable plate 14 rotates to fit with the housing 2, it can seal the housing 2. A driving frame 15 is arranged below the movable plate 14, and the driving frame 15 can slide up and down relative to the fixed rod 1 to rotate the movable plate 14 from a horizontal state to a vertical state.

[0033] As Figures 2 - 6 shown:

[0034] Before the sampling work, the movable plate 14 is in a horizontal and outwardly expanded state. At this time, the test tube 10 is placed into the placement groove 9, and then the driving frame 15 is manually pushed upward. The driving frame 15 will push the movable plate 14 from a horizontal state to a vertical state where it fits with the side wall of the housing 2 and seals the housing 2, and the driving frame 15 will stay at this position through static friction to ensure the continuous restriction of the movable plate 14. During the upward rotation of the movable plate 14, it will push the top piece 11 to rise through the support rod 13. At this time, the top piece 11 will push the placement plate 8 to rise along the cavity 7 through the first spring 12 (the side wall of the placement plate 8 has a sliding part, and a vertical groove matching with this sliding part is opened on the inner wall of the cavity 7), but will not compress the first spring 12, thereby causing the test tube 10 to rise. When the movable plate 14 rotates to the vertical state, the test tube 10 will rise to the position where it contacts the inner top wall of the housing 2 (at this time, the sliding part on the side wall of the placement plate 8 slides to the top of the vertical groove), and then the sampling work can be carried out;

[0035] The sampling work is as follows:

[0036] The fixed rod 1 and the housing 2 are simultaneously dropped into the water to the height to be detected by the dropping group and then the dropping is stopped. Then, the driving group is used to make the extraction plate 5 slide down along the housing 2. While the extraction plate 5 slides down, external water sources will flow into the interior of the housing 2 through the through holes 6 by negative pressure and are located at the middle position of the frame 4. As the extraction progresses, more external water sources will enter the interiors of multiple housings 2, and the water sources at different heights are temporarily stored after entering the interiors of the housings 2, and the water sources during the extraction process are mixed into the interiors of the housings 2. The mixed water sources can obtain the homogenization degree of the suspended matter in the water at this height, and the extraction method can ensure that there is no cross-flow during the sampling process and the suspended matter in different water layers will not be disturbed due to the generation of bubbles, thereby making the subsequent detection results more accurate;

[0037] The top end of the frame 4 is attached to the inner top wall of the housing 2, which can ensure that water will not enter. When the extraction plate 5 descends to contact the bottom of the frame 4, the extraction plate 5 will press down on the frame 4, causing the frame 4 to slide down along the chute 3 and compress the driving spring 31. At this time, the top end of the frame 4 will separate from the inner top wall of the housing 2. At this time, the water source mixed inside the housing 2 will enter the cavity 7 and the test tube 10. At this time, the sliding part of the placement plate 8 is at the uppermost position of the vertical groove. Therefore, when the frame 4 slides down and compresses the driving spring 31, the frame 4 will simultaneously drive the placement plate 8 and the test tube 10 to descend, but the movable plate 14 and the support rod 13 are in a static state. Therefore, at this time, the placement plate 8 will press down on the first spring 12;

[0038] When the extraction plate 5 descends to the limit, the driving group will control the extraction plate 5 to rise. At this time, the frame 4 and the placement plate 8 will also rise and reset, and the top end of the test tube 10 will again be attached to the inner top wall of the housing 2, thereby preventing the water source inside the test tube 10 from mixing with the water source inside the cavity 7. During the process of lifting the fixed rod 1 and the housing 2 out of the water after the sampling work is completed, the suspended matter inside the cavity 7 will precipitate from the upper layer to the lower layer. If the test tube 10 is in an unclosed state, although the suspended matter in the test tube 10 will precipitate to the lower layer of the water source inside the test tube 10, if the fixed rod 1 and the housing 2 shake, it is easy for the suspended matter inside the test tube 10 to flow into the cavity 7, thereby changing the sampled sample;

[0039] When the extraction plate 5 continues to rise after separating from the frame 4, it will discharge the excess water source inside the housing 2 through the through hole 6. Then, when the extraction plate 5 rises to the initial state, it stops. At this time, the sampling work is completed;

[0040] Then, the dropping group is used to pull the fixed rod 1 and the housing 2 up to separate from the water source, and then the test tube 10 is taken out;

[0041] The process of taking out the test tube 10 is as follows:

[0042] Manually slide the driving frame 15 downward. At this time, the movable plate 14 will also expand outward. It pulls the placement plate 8 and the test tube 10 to descend to a position where they do not contact the inner top wall of the frame 4 through the support rod 13. The excess water source inside the cavity 7 will automatically flow outwards. Then, directly take out the test tube 10 from the placement groove 9;

[0043] In the present invention, through the arrangement of multiple shells 2, when sampling, the water source in waters at different heights is pumped into the interior of the shell 2 by the downward sliding of the extraction plate 5. And the water sources during the continuous extraction process when the extraction plate 5 descends can be mixed, rather than a single-sample at a single time, so as to obtain a homogeneous sample of the water source at this height. During the process when the extraction plate 5 contacts the frame 4 and pushes the frame 4 to descend, the mixed water source inside the shell 2 will enter the interior of the cavity 7 and the test tube 10. Thus, the sample directly enters the test tube 10 and the final sample is obtained. Then, when taking out the test tube 10 later, it can be directly sent for inspection, and there is no need to pour the sample inside the sampling cylinder into the test tube 10 after vibration, avoiding the suspension settling in the sampling cylinder and resulting in a non-standard sample poured into the test tube 10. And during the sampling process, it can avoid the disorder of the water source and the suspension at this height caused by air bubbles;

[0044] In the present invention, when the extraction plate 5 descends to the limit, the driving group will control the extraction plate 5 to rise. At this time, the frame 4 and the placement plate 8 will also rise and reset. And the top end of the test tube 10 will fit with the inner top wall of the shell 2 again. Thus, the water source inside the test tube 10 will not be mixed with the water source inside the cavity 7. Because during the process of lifting the fixing rod 1 and the shell 2 out of the water surface after the sampling work is completed, the suspended matter inside the cavity 7 will precipitate from the upper layer to the lower layer. If the test tube 10 is in an unclosed state, although the suspended matter in the test tube 10 will precipitate to the lower layer of the water source inside the test tube 10, if the fixing rod 1 and the shell 2 shake, it is easy for the suspended matter inside the test tube 10 to flow into the cavity 7, thus changing the sampled sample.

[0045] Sealing groups are arranged inside the cavity 7;

[0046] The sealing group includes sealing pieces 16 arranged on both sides of the test tube 10 and transition surfaces 17 opened on the side walls of the cavity 7. The sealing pieces 16 are slidably connected to the top end of the placement plate 8. Second springs 18 are fixedly connected between the inner walls of the sealing pieces 16 and the top end of the placement plate 8. When the sealing pieces 16 follow the placement plate 8 to rise, their ends will contact the transition surfaces 17 and move along the placement plate 8 under the push of the transition surfaces 17.

[0047] Columns 19 are arranged directly above the test tubes 10. The diameter of the columns 19 is smaller than the inner diameter of the test tubes 10. The columns 19 are fixedly connected to the inner walls of the shells 2.

[0048] As Figures 2 - 7 shown:

[0049] After the test tube 10 is placed in the placement groove 9, the driving frame 15 pushes the movable plate 14 to rotate from the horizontal state to the vertical state. At this time, the placement plate 8 will be pushed up by the top piece 11 and the support rod 13. During the rising process of the placement plate 8, the sealing piece 16 will be driven to rise. The sealing piece 16 will rise while keeping in contact with the inclined transition surface 17, and will slide along the top end of the placement plate 8 and compress the second spring 18. As the placement plate 8 rises, the sealing piece 16 will approach the top end of the test tube 10. When the placement plate 8 rises to the limit, the top end of the test tube 10 will be outside the column 19 and contact the inner top wall of the housing 2, and the sealing piece 16 will fit with the inner top wall of the housing 2 while clamping and wrapping the side wall of the test tube 10. At this time, the sealing piece 16 closes the top end of the cavity 7, and the side wall of the movable plate 14 will fit with one side of the sealing piece 16, thus closing the cavity 7;

[0050] When the draw plate 5 descends to contact the frame 4 and drives the frame 4 to descend, the sealing piece 16, the placement plate 8 and the test tube 10 will descend synchronously. At this time, both the sealing piece 16 and the top end of the test tube 10 will be separated from the inner top wall of the housing 2. Then the water source inside the housing 2 can enter the test tube 10 and fill the test tube 10, but will not enter the cavity 7. Therefore, there will be no water source discharged from the cavity 7 after the movable plate 14 is opened later. Then, after the draw plate 5 rises to be separated from the frame 4, the top ends of the test tube 10 and the sealing piece 16 will contact the inner top wall of the housing 2 again, thereby sealing the test tube 10 to prevent the internal sample from flowing out due to the inclination of the test tube 10;

[0051] When the frame 4 descends, the test tube 10 will descend from the outside of the column 19. However, after the test tube 10 descends to the limit, the lower part of the column 19 is still inside the test tube 10, and the part inserted into the test tube 10 will occupy a certain volume inside the test tube 10. Therefore, after the water source inside the housing 2 enters the test tube 10, the inside of the test tube 10 will not be completely filled. This can ensure that the sampling work is completed and when the test tube 10 is taken out, the test tube 10 will not be in an overflow state, but there will be space to insert the stopper, and there is no need to manually pour out the excess part.

[0052] A driving piece 20 is slidably connected to the bottom end of the frame 4. The driving piece 20 is U-shaped and its left and right ends are wedge-shaped. A third spring 21 is fixedly connected between the driving piece 20 and the bottom of the frame 4. Positioning rods 30 are arranged on both sides of the driving piece 20. The positioning rods 30 are slidably connected to positioning holes 22. The positioning holes 22 are opened on the inner wall of the housing 2. The positioning rods 30 are slidably connected to the bottom of the frame 4, and a fourth spring 23 is fixedly connected between the positioning rods 30 and the inner wall of the frame 4.

[0053] As Figure 5 and Figure 6 shown:

[0054] When the extraction plate 5 slides down along the inner wall of the housing 2, friction will be generated with the side wall of the frame 4. A rubber layer is provided at the edge of the extraction plate 5. To prevent the frame 4 from being directly driven to descend by friction when the extraction plate 5 descends, the frame 4 can be restricted by the positioning rod 30 located inside the positioning hole 22, avoiding the frame 4 from descending and resetting when the extraction plate 5 has not descended to the limit extent;

[0055] When the extraction plate 5 descends to contact the side wall of the frame 4, the extraction plate 5 will first press down the driving piece 20. At this time, the driving piece 20 will slide down along the frame 4 and stretch the third spring 21. When the side wall of the driving piece 20 descends to disengage from the positioning rod 30, the positioning rod 30 will drive the positioning rod 30 to slide along the frame 4 under the elastic reset action of the fourth spring 23, and then move the positioning rod 30 out of the positioning hole 22, thereby releasing the restriction on the frame 4. At this time, the frame 4 can be pressed down by the extraction plate 5;

[0056] When the extraction plate 5 ascends, the driving spring 31 pushes the frame 4 to ascend. When the extraction plate 5 disengages from the frame 4, the driving piece 20 resets under the reset action of the third spring 21, and pushes the positioning rod 30 into the positioning hole 22 again through the side wall to restrict the frame 4.

[0057] The driving group includes a cylinder 24, which is embedded inside the housing 2, and the top end of the cylinder 24 is fixedly connected to the extraction plate 5.

[0058] As Figures 2 - 4 shown:

[0059] The telescopic movement of the cylinder 24 drives the up and down movement of the extraction plate 5, and the process is reliable and the operation is simple.

[0060] The driving frame 15 is fixedly connected with a connecting rod 25 in common, and the connecting rod 25 is slidably connected with the fixed rod 1.

[0061] As Figure 11 shown:

[0062] By the sliding of the connecting rod 25 along the fixed rod 1, the up and down movement of the driving frame 15 is driven, thereby facilitating the pushing of the movable plate 14. When the connecting rod 25 slides along the fixed rod 1, it has a self-restricting effect, that is, the connecting rod 25 can stay at any position of the fixed rod 1, thereby facilitating the operation, which can be achieved by increasing friction or various other existing technologies.

[0063] The feeding group includes a connecting piece 26, which is fixedly connected to the top end of the uppermost housing 2. A threaded jack 27 is provided on the connecting piece 26, and a through hole 28 is provided on the connecting piece 26.

[0064] As Figure 9 and Figure 10 shown:

[0065] When sampling in a shallow water area, the connection with the connecting piece 26 can be achieved through a threaded rod that can be threadedly connected to the threaded jack 27, so as to facilitate the input into the water area. For a deeper water area, it can be put in by tying a rope to the perforation 28.

[0066] A filter cover 29 is arranged above the through hole 6.

[0067] As Figure 3 shown:

[0068] When the through hole 6 absorbs water, the filter cover 29 can filter out larger impurities to avoid blockage.

Claims

1. A multi-point sampling device for water quality detection based on environmental protection, comprising a delivery group, a fixed rod (1), and a plurality of sampling devices arranged vertically on the fixed rod (1), wherein the delivery group is used to connect with the fixed rod (1) after the fixed rod (1) enters the water, and is characterized in that: The sampling device comprises a shell (2), the left and right sides of the shell (2) are both connected to the outside world, a U-shaped frame (4) is arranged inside the shell (2), a slide groove (3) is provided on the inner wall of the shell (2), the frame (4) is slidably connected to the slide groove (3), and a driving spring (31) is fixedly connected between the bottom end of the frame (4) and the inner bottom wall of the shell (2), a pumping plate (5) is slidably connected inside the shell (2), the top end of the pumping plate (5) extends to the top of the shell (2), a driving group is arranged on one side of the pumping plate (5), and the driving group is used to control the lifting of the pumping plate (5), the pumping plate (5) is arranged at a position higher than the frame (4), a through hole (6) connected to the outside world is provided on the shell (2), and a cavity (7) is provided on the left and right side walls of the frame (4), and a placement plate ( 8), a placement groove (9) is provided on the placement plate (8), a test tube (10) is arranged inside the placement groove (9), the placement plate (8) is slidably connected to the inner wall of the cavity (7), the placement plate (8) is slidably connected to a top plate (11), a first spring (12) is fixedly connected between the top of the top plate (11) and the inner wall of the placement plate (8), the top plate (11) is rotatably connected to a support rod (13), the bottom end of the support rod (13) is rotatably connected to a movable plate (14), the movable plate (14) is rotatably connected to the side wall of the shell (2), the movable plate (14) is able to seal the shell (2) after rotating to fit with the shell (2), a driving frame (15) is arranged below the movable plate (14), the driving frame (15) can slide up and down relative to the fixed rod (1) to rotate the movable plate (14) from horizontal to vertical; After the delivery group delivers the shell (2) to a specific water source height for sampling, the pumping plate (5) slides down inside the shell (2). When the pumping plate (5) slides down from the inside of the shell (2), the external water source is introduced into the inside of the shell (2) through the through hole (6) by negative pressure and is located in the middle position of the frame (4). After the pumping plate (5) slides down from the inside of the shell (2) until it contacts the frame (4), it presses down the frame (4) and compresses the driving spring (31), and the top end of the frame (4) fits against the inner top wall of the shell (2). After the frame (4) is pressed down by the pumping plate (5), it slides down along the slide groove (3) so that the mixed water source inside the shell (2) enters the cavity (7) and the test tube (10).

2. A multi-point sampling device for water quality detection based on environmental protection according to claim 1, characterized in that: A sealing group is provided inside the cavity (7); The sealing group comprises sealing sheets (16) arranged on both sides of the test tube (10) and a transition surface (17) opened on the side wall of the cavity (7); the sealing sheet (16) is slidably connected to the top of the placement plate (8); a second spring (18) is fixedly connected between the inner wall of the sealing sheet (16) and the top of the placement plate (8); when the sealing sheet (16) rises with the placement plate (8), its end will contact the transition surface (17) and be pushed by the transition surface (17) to move along the placement plate (8).

3. A multi-point sampling device for water quality detection based on environmental protection according to claim 2, characterized in that: A column (19) is disposed directly above each of the test tubes (10); the diameter of each of the columns (19) is smaller than the inner diameter of the test tube (10); and each of the columns (19) is fixedly connected to the inner wall of the housing (2); After the placement plate (8) rises to the limit, the top end of the test tube (10) is outside the column (19) and contacts the top wall of the shell (2). When the frame (4) descends, the test tube (10) descends from the outside of the column (19) and after the test tube (10) descends to the limit, the bottom end of the column (19) is still inside the test tube (10).

4. A multi-point sampling device for water quality detection based on environmental protection according to claim 1, characterized in that: The bottom end of the frame (4) is slidably connected to a driving plate (20), the driving plate (20) is U-shaped and its left and right ends are wedge-shaped, a third spring (21) is fixedly connected between the driving plate (20) and the bottom of the frame (4), positioning rods (30) are provided on both sides of the driving plate (20), the positioning rods (30) are slidably connected to positioning holes (22), the positioning holes (22) are formed on the inner wall of the shell (2), the positioning rods (30) are slidably connected to the bottom of the frame (4), and a fourth spring (23) is fixedly connected between the positioning rods (30) and the inner wall of the frame (4).

5. The multi-point sampling device for water quality detection based on environmental protection according to claim 1 is characterized in that: The driving group comprises a cylinder (24), the cylinder (24) being embedded in the housing (2), and the top end of the cylinder (24) being fixedly connected to the pumping plate (5).

6. A multi-point sampling device for water quality detection based on environmental protection according to claim 1, characterized in that: The driving frame (15) is fixedly connected to a connecting rod (25), and the connecting rod (25) is slidably connected to the fixed rod (1).

7. A multi-point sampling device for water quality detection based on environmental protection according to claim 1, characterized in that: The delivery group comprises a connecting piece (26), wherein the connecting piece (26) is fixedly connected to the top of the uppermost shell (2), a threaded insertion hole (27) is provided on the connecting piece (26), and a through hole (28) is opened on the connecting piece (26).

8. The multi-point sampling device for water quality detection based on environmental protection according to claim 1 is characterized in that: A filter cover (29) is provided above the through hole (6).

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