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

Abstract

The invention discloses a multi-point sampling device for water quality detection based on environmental protection in the technical field of water quality detection sampling, the multi-point sampling device comprises a putting group, a fixed rod and a plurality of sampling devices vertically arranged on the fixed rod, and the putting group is used for being connected with the fixed rod after the fixed rod enters water; according to the water source sampling device disclosed by the invention, through the arrangement of the plurality of shells, water sources in water areas with different heights are pumped into the shells through downward sliding of the pulling plate during sampling, and the water sources can be mixed in the continuous pumping process of descending of the pulling plate instead of a single sample at a single time, so that a uniform sample of the water source at the height is obtained; in the process that the pulling plate makes contact with the frame and pushes the frame to descend, the mixed water source in the shell can enter the cavity and the test tube, then the sample directly enters the test tube, and the final sample is obtained.

Description

Technical Field

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

[0002] Water is the source of life. Human beings cannot live without water in their lives and production activities. The quality of 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 drinking water are constantly increasing, and the drinking water quality standards are also constantly developing and improving accordingly. Usually, a multi-point sampling device for water quality testing is used to sample and test suspended matter at different heights of the same water source to ensure the quality of drinking water; like Figure 1 As shown, the existing sampling devices mostly perform sampling through the cooperation of multiple sampling tubes and baffles arranged up and down. The sampling process is to put the baffle and the sampling tube into the water at a fixed height, and then relatively separate the baffle and the sampling tube, so that the water at the fixed height of the water source can enter the sampling tube. Although it can ensure that there is no cross-flow, in use, after the baffle is separated from the sampling tube, the water source enters the sampling tube and squeezes out the air inside the sampling tube to generate bubbles. Sampling is for detecting suspended matter at different heights in 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, which will cause the suspended matter at different heights to change, thereby affecting the sampling accuracy. In addition, after sampling, the existing sampling tube needs to pour the sample inside the sampling tube into a test tube for inspection. The process is cumbersome and inefficient. Summary of the invention

[0003] 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 technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: 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 arranged vertically 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 comprises a shell, the left and right sides of the shell are both connected with the outside world, a U-shaped frame is arranged inside the shell, a slide groove is provided on the inner wall of the shell, the frame is slidably connected to the slide groove, and a driving spring is fixedly connected between the bottom end of the frame and the inner bottom wall of the shell, a pumping plate is slidably connected inside the shell, the top end of the pumping plate extends to the top of the shell, a driving group is provided on one side of the pumping plate, the driving group is used to control the lifting of the pumping plate, the pumping plate is arranged at a position higher than the frame, and the shell The body is provided with a through hole communicating with the outside world, the left and right side walls of the frame are provided with a cavity, the interior of the cavity is slidably connected with a placement plate, the placement plate is provided with a placement groove, 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 plate, a first spring is fixedly connected between the top of the top plate and the inner wall of the placement plate, the top plate is rotatably connected with a support rod, the bottom end of the support rod is rotatably connected with a movable plate, the movable plate is rotatably connected to the side wall of the shell, the movable plate can be sealed after rotating to fit with the shell, a driving frame is arranged under the movable plate, the driving frame can slide up and down relative to the fixed rod to rotate the movable plate from horizontal to vertical.

[0005] As a further solution of the present invention, a sealing group is provided inside the cavity; The sealing group includes sealing sheets arranged on both sides of the test tube and a transition surface opened on the side wall of the cavity. The sealing sheet is slidably connected to the top of the placement plate. A second spring is fixedly connected between the inner wall of the sealing sheet and the top of the placement plate. When the sealing sheet rises with the placement plate, its end will contact the transition surface and be pushed by the transition surface to move along the placement plate.

[0006] As a further solution of the present invention, a column is arranged directly above the test tube, the diameter of the column is smaller than the inner diameter of the test tube, and the columns are fixedly connected to the inner wall of the shell.

[0007] As a further solution of the present invention, a driving plate is slidably connected to the bottom end of the frame, the driving plate is U-shaped and its left and right ends are wedge-shaped, a third spring is fixedly connected between the driving plate and the bottom of the frame, positioning rods are provided on both sides of the driving plate, the positioning rods are slidably connected with positioning holes, the positioning holes are opened on the inner wall of the shell, the positioning rods are slidably connected to the bottom of the frame, and a fourth spring is fixedly connected between the positioning rods and the inner wall of the frame.

[0008] As a further solution of the present invention, the driving group includes a cylinder, the cylinder is embedded in the shell, and the top end of the cylinder is fixedly connected to the pumping plate.

[0009] As a further solution of the present invention, the driving frames are fixedly connected to a connecting rod, and the connecting rod is slidably connected to the fixed rod.

[0010] As a further solution of the present invention, the delivery group includes a connecting piece, the connecting piece is fixedly connected to the top of the uppermost shell, a threaded socket is provided on the connecting piece, and a through hole is opened on the connecting piece.

[0011] As a further solution of the present invention, a filter cover is arranged above the through hole.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention, through the arrangement of multiple shells, can draw water sources in water areas of different heights into the shell through the downward movement of the pumping plate during sampling, and the water source can be mixed in the process of continuous extraction as the pumping plate descends, rather than a single sample at a single time, so as to obtain a uniform sample of the water source at that height. When the pumping plate contacts the frame and pushes the frame down, the mixed water source inside the shell will enter the cavity and the inside of the test tube, so that the sample can directly enter the inside of the test tube and obtain the final sample, and then the test tube can be taken out later and sent directly for inspection without having to put the taken out sample into the test tube. In addition, during the sampling process, it can avoid the disorder of the water source and suspended matter at that height caused by bubbles.

[0013] 2. When the pumping plate drops to the limit, the driving group will control the pumping plate to rise. At this time, the frame and the placement plate will also rise and reset, and the top of the test tube will fit with the top wall of the shell again, so that the water source inside the test tube will not mix with the water source inside the cavity. Because the sampling work is completed and the fixed rod and the shell are lifted out of the water, the suspended matter inside the cavity will settle 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 settle to the lower layer of the water source in the test tube, if the fixed rod and the shell shake, it is easy for the suspended matter inside the test tube to flow into the cavity, thereby changing the sample being sampled. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the fitting of the conventional sampling tube and the baffle of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 is a side view of the housing of the present invention; Figure 4 It is a side view of the frame and movable plate of the present invention; Figure 5 It is a schematic diagram of the slide groove and the positioning hole of the present invention; Figure 6 It is a schematic diagram of the positional relationship between the frame, the driving plate and the sealing plate of the present invention; Figure 7 It is a schematic diagram of the positional relationship between the sealing sheet and the second spring of the present invention; Figure 8 Schematic diagram of the positional relationship between the top sheet and the placement plate of the present invention; Fig. 9 It is a schematic diagram of the positional relationship between the housing, the connecting member and the fixing rod of the present invention; Fig.10 for Fig. 9 A partial enlarged view of the middle A; Fig.11 The figure is a schematic diagram of the positional relationship between the fixing rod, the connecting rod and the driving frame of the present invention.

[0015] In the accompanying drawings, the reference numerals are annotated as follows: 1. Fixed rod; 2. Shell; 3. Slide groove; 4. Frame; 5. Drawer plate; 6. Through hole; 7. Cavity; 8. Placement plate; 9. Placement groove; 10. Test tube; 11. Top plate; 12. First spring; 13. Support rod; 14. Movable plate; 15. Drive frame; 16. Sealing plate; 17. Transition surface; 18. Second spring; 19. Column; 20. Drive plate; 21. Third spring; 22. Positioning hole; 23. Fourth spring; 24. Cylinder; 25. Connecting rod; 26. Connecting piece; 27. Threaded socket; 28. Perforation; 29. ​​Filter cover; 30. Positioning rod; 31. Drive spring. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-Figure 11The present invention provides a technical solution: 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, the delivery group is used to connect with the fixed rod 1 after the fixed rod 1 enters the water, 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 provided on one side of the pumping plate 5, 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, and the upper part of the shell 2 A through hole 6 communicating with the outside is provided, cavities 7 are provided on the left and right side walls of the frame 4, and a placement plate 8 is slidably connected to the interior of the cavity 7, a placement groove 9 is provided on the placement plate 8, and a test tube 10 is provided 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 the 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, and a movable plate 14 is rotatably connected to the bottom end of the support rod 13, the movable plate 14 is rotatably connected to the side wall of the shell 2, and the movable plate 14 can seal the shell 2 after it is rotated to fit with the shell 2, and a driving frame 15 is provided below the movable plate 14, and the driving frame 15 can slide up and down relative to the fixed rod 1 and thereby rotate the movable plate 14 from horizontal to vertical.

[0018] like Figure 2-Figure 6 As shown: Before sampling, the movable plate 14 is in a horizontal and outwardly extended state. At this time, the test tube 10 is placed in the placement groove 9, and then the driving frame 15 is manually pushed upward. The driving frame 15 pushes the movable plate 14 to rotate upward from the horizontal state to a vertical state in contact with the side wall of the shell 2 and seals the shell 2, and the driving frame 15 will stay at this position through static friction to ensure continuous restriction of the movable plate 14. During the upward rotation of the movable plate 14, the top plate 11 will be pushed up by the support rod 13. At this time, the top plate 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 portion, and the inner wall of the cavity 7 is provided with a vertical groove matching the sliding portion), but will not compress the first spring 12, thereby causing the test tube 10 to rise. When the movable plate 14 is rotated to the vertical state, the test tube 10 will rise to the position where the top wall of the shell 2 contacts (at this time, the sliding portion of 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; The sampling process is as follows: The fixing rod 1 and the shell 2 are simultaneously dropped into the water at a height to be detected by the dropping group, and then the dropping is stopped. Then the pumping plate 5 is made to slide down along the shell 2 by the driving group. When the pumping plate 5 slides down, the external water source will flow into the shell 2 through the through hole 6 through negative pressure, and is in the middle position of the frame 4. As the extraction proceeds, more external water sources will enter the interior of multiple shells 2, and water sources at different heights will enter the shell 2 for temporary storage, and the water sources in the extraction process will be mixed into the shell 2. The mixed water sources can obtain the uniformity of suspended matter in the water area at this height, and the extraction method can ensure that there will be no cross-flow during the sampling process and that 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; The top of the frame 4 is in contact with the inner top wall of the shell 2, which can ensure that the water source does not enter. When the draw plate 5 drops to contact with the bottom of the frame 4, the draw plate 5 will press the frame 4 downward, so that the frame 4 slides down along the slide groove 3 and compresses the driving spring 31. At this time, the top of the frame 4 and the inner top wall of the shell 2 will be separated. At this time, the mixed water in the shell 2 will enter the cavity 7 and the test tube 10, and the sliding part of the placement plate 8 is at the top of the vertical groove. Therefore, when the frame 4 slides down and compresses the driving spring 31, the frame 4 will drive the placement plate 8 and the test tube 10 to drop at the same time, but the movable plate 14 and the support rod 13 are in a static state, so the placement plate 8 will press the first spring 12 downward at this time; When the pumping plate 5 is lowered to the limit, the driving group will control the pumping plate 5 to rise, and at this time the frame 4 and the placing plate 8 will also rise and reset, and the top of the test tube 10 will fit with the top wall of the shell 2 again, so that the water source inside the test tube 10 will not mix with the water source inside the cavity 7. In the process of lifting the fixing rod 1 and the shell 2 out of the water after the sampling work is completed, the suspended matter inside the cavity 7 will settle from the upper layer to the lower layer. If the test tube 10 is in an unsealed state, although the suspended matter in the test tube 10 will settle to the lower layer of the water source in 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, thereby changing the sample being sampled. When the pumping plate 5 is out of contact with the frame 4 and continues to rise, the excess water inside the housing 2 will be discharged through the through hole 6, and then the pumping plate 5 will rise to the initial state and stop, at which time the sampling work is completed; Then, the fixing rod 1 and the housing 2 are pulled up by the delivery group until they are separated from the water source, and then the test tube 10 is taken out; The process of taking out the test tube 10 is as follows: Manually slide the driving frame 15 downward, and the movable plate 14 will also expand outward, and pull the placement plate 8 and the test tube 10 down to a position where they are not in contact with the top wall of the frame 4 through the support rod 13, and the excess water in the cavity 7 will automatically flow out, and then the test tube 10 can be directly taken out of the placement slot 9; The present invention, through the arrangement of multiple shells 2, can draw water sources in water areas of different heights into the shell 2 through the downward movement of the pumping plate 5 during sampling, and the water source can be mixed in the process of continuous extraction when the pumping plate 5 descends, rather than a single sample at a single time, so as to obtain a uniform sample of the water source at the height, and the mixed water source inside the shell 2 will enter the cavity 7 and the test tube 10 when the pumping plate 5 contacts the frame 4 and pushes the frame 4 downward, so that the sample directly enters the test tube 10 and obtains the final sample, and then the test tube 10 can be taken out later and sent directly for inspection, and there is no need to pour the sample inside the sampling tube into the test tube 10 after vibration, so as to avoid the precipitation of suspended matter in the sampling tube and cause the sample poured into the test tube 10 to be non-standard, and in the sampling process, it can avoid the disorder of the water source and suspended matter at the height caused by bubbles; According to the present invention, when the draw plate 5 drops to the limit, the driving group will control the draw plate 5 to rise, and at this time the frame 4 and the placement plate 8 will also rise and reset, and the top of the test tube 10 will fit with the inner top wall of the shell 2 again, so that the water source inside the test tube 10 will not be mixed with the water source inside the cavity 7. In the process of lifting the fixing rod 1 and the shell 2 out of the water after the sampling work is completed, the suspended matter inside the cavity 7 will settle from the upper layer to the lower layer. If the test tube 10 is in an unsealed state, although the suspended matter in the test tube 10 will settle to the lower layer of the water source in 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, thereby causing the sample to change.

[0019] The cavity 7 is provided with a sealing group inside; The sealing group includes 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.

[0020] A column 19 is disposed directly above the test tube 10 . The diameter of the column 19 is smaller than the inner diameter of the test tube 10 . The column 19 is fixedly connected to the inner wall of the shell 2 .

[0021] like Figure 2-Figure 7 As shown: When 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 plate 11 and the support rod 13. During the rising process of the placement plate 8, the sealing plate 16 will be driven to rise. The sealing plate 16 will maintain contact with the inclined transition surface 17 and rise, and will slide along the top of the placement plate 8 and compress the second spring 18. As the placement plate 8 rises, the sealing plate 16 will approach the top of the test tube 10. When the placement plate 8 rises to the limit, the top of the test tube 10 will be outside the column 19 and will contact the inner top wall of the shell 2, and the sealing plate 16 will keep clamping and wrapping the side wall of the test tube 10 while fitting with the inner top wall of the shell 2. At this time, the sealing plate 16 closes the top of the cavity 7, and the side wall of the movable plate 14 fits with one side of the sealing plate 16, thereby closing the cavity 7. When the draw plate 5 descends to contact with the frame 4 and drives the frame 4 to descend, the sealing sheet 16, the placement plate 8 and the test tube 10 will descend synchronously. At this time, the sealing sheet 16 and the top of the test tube 10 will be out of contact with the inner top wall of the shell 2, so that the water source inside the shell 2 can enter the test tube 10 and fill the test tube 10, but will not enter the cavity 7, and then after the movable plate 14 is opened, no water source will be discharged from the cavity 7, and after the draw plate 5 rises to be out of contact with the frame 4, the top of the test tube 10 and the sealing sheet 16 will be in contact with the inner top wall of the shell 2 again, thereby sealing the test tube 10 to prevent the internal sample from flowing out due to the tilt of the test tube 10; When the frame 4 descends, the test tube 10 will descend from the outside of the column 19, but after the test tube 10 descends to the limit, the bottom 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, so that after the water source inside the shell 2 enters the inside of the test tube 10, the inside of the test tube 10 will not be completely filled, which can ensure that the sampling work is completed and the test tube 10 will not overflow when taking out the test tube 10, but there is space for plugging in the stopper, and there is no need to manually pour out the excess part.

[0022] A driving plate 20 is slidably connected to the bottom end of the frame 4. 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 the positioning holes 22. The positioning holes 22 are provided on the inner wall of the shell 2. The positioning rods 30 are slidably connected to the bottom of the frame 4. A fourth spring 23 is fixedly connected between the positioning rods 30 and the inner wall of the frame 4.

[0023] like Figure 5 and Figure 6 As shown: When the drawer plate 5 slides down from the inner wall of the housing 2, it will generate friction with the side wall of the frame 4. A rubber layer is provided on the edge of the drawer plate 5. In order to prevent the drawer plate 5 from directly driving the frame 4 down by friction when it descends, the positioning rod 30 in the positioning hole 22 can limit the frame 4, so as to prevent the drawer plate 5 from driving the frame 4 down and restoring after it has not descended to the limit. When the draw plate 5 is lowered to contact the side wall of the frame 4, the draw plate 5 will first press down the driving plate 20, and the driving plate 20 will slide down along the frame 4 and stretch the third spring 21. When the side wall of the driving plate 20 is lowered to disengage from the positioning rod 30, the positioning rod 30 is driven to slide along the frame 4 under the elastic return action of the fourth spring 23, and then the positioning rod 30 is moved 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 draw plate 5. When the drawer plate 5 rises, the driving spring 31 pushes the frame 4 to rise. When the drawer plate 5 is out of contact with the frame 4, the driving plate 20 is reset under the reset action of the third spring 21, and the positioning rod 30 is pushed through the side wall to enter the positioning hole 22 again to restrict the frame 4.

[0024] The driving group includes a cylinder 24 , which is embedded in the housing 2 , and the top end of the cylinder 24 is fixedly connected to the draw plate 5 .

[0025] like Figure 2-Figure 4 As shown: The draw plate 5 is driven to move up and down by the extension and contraction of the cylinder 24, and the process is reliable and easy to operate.

[0026] The driving frame 15 is fixedly connected with a connecting rod 25 , and the connecting rod 25 is slidably connected with the fixing rod 1 .

[0027] like Fig.11 As shown: The connecting rod 25 slides along the fixed rod 1 to drive the driving frame 15 up and down, thereby facilitating the pushing of the movable plate 14. The connecting rod 25 has a self-limiting effect when sliding along the fixed rod 1, that is, the connecting rod 25 can stay at any position of the fixed rod 1, thereby facilitating operation. This can be achieved by increasing friction or various other methods in the prior art.

[0028] The delivery group includes a connecting member 26 , which is fixedly connected to the top of the uppermost shell 2 . A threaded plug hole 27 is provided on the connecting member 26 , and a through hole 28 is opened on the connecting member 26 .

[0029] like Fig. 9 and Fig.10 As shown: When sampling in shallow water areas, the connection with the connector 26 can be achieved through a threaded rod that can be threadedly connected to the threaded socket 27, so that it is convenient to put it into the water area. For deeper water areas, it can be tied to the perforation 28 with a rope for release.

[0030] A filter cover 29 is arranged above the through hole 6 .

[0031] like Figure 3 As shown: The filter cover 29 can filter out larger impurities when the through hole 6 absorbs water, thereby avoiding clogging.

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) and thereby rotate the movable plate (14) from horizontal to vertical.

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 provided 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 shell (2).

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. A multi-point sampling device for water quality detection based on environmental protection according to claim 1, 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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