Water quality monitoring device for environmental engineering

Abstract

The invention relates to the technical field of water quality monitoring, in particular to a water quality monitoring device for environmental engineering. Comprising a monitoring box and a monitoring sensor, a driving motor is arranged on the monitoring box, the monitoring box floats on the water surface, and a power-up device used for charging the driving motor is arranged on the monitoring box. According to the scheme, through arrangement of a negative pressure plate and a time delay block, when excessive impurities are accumulated on the filter plate, water can be influenced to pass through the filter plate, then the negative pressure plate moves towards the inner side of an extension pipe under the action of negative pressure, so that the filter plate is pushed to move downwards, and when the filter plate moves downwards to a certain position, the water is prevented from entering the filter plate. The filter plate can rotate by an angle, the side, attached with impurities, of the filter plate can be opposite to the flow direction of water flow, then the attached impurities are pushed down from the filter plate through impact of the water flow, and therefore accumulated impurities are deeply cleaned.

Description

Technical Field

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

[0002] Water quality monitoring is the process of evaluating water quality and its changes by measuring physical, chemical and biological indicators in water. It is of great significance in environmental protection, public health, economic development and scientific research.

[0003] For example, the Chinese patent authorization number is CN118518642B, which is a water quality monitoring device for a low-water-level river. This method can monitor water at different depths and clean impurities in the water that adhere to the device.

[0004] However, when monitoring water at different depths, this method can only monitor the water quality of a fixed depth interval. The monitoring sensors used for monitoring at each depth cannot be independently adjusted relative to other depths, which will affect the applicability of the device in different situations. In addition, in water quality monitoring, the cleaning process of impurities adsorbed on the surface is only completed by scraping, and its cleaning efficiency is prone to impurity accumulation in the long run.

[0005] In view of the above situation, a water quality monitoring device for use in environmental engineering is proposed. Summary of the invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a water quality monitoring device for environmental engineering to solve the problems raised in the above background technology.

[0007] A water quality monitoring device for environmental engineering, comprising a monitoring box and a monitoring sensor, wherein a driving motor is arranged on the monitoring box, the monitoring box floats on the water surface, and a power supply device for charging the driving motor is arranged on the monitoring box; The bottom of the monitoring box is provided with a plurality of water intake mechanisms immersed in water, and the plurality of water intake mechanisms can autonomously adjust the depth of extension in the water. The monitoring box is provided with a plurality of pumping chambers, and the pumping chambers correspond to the water intake mechanisms, and the monitoring sensors are arranged in the pumping chambers; The water intake mechanism includes a fixed pipe and an extension pipe. The extension pipe can move in a vertical direction relative to the fixed pipe. A cleaning mechanism is arranged in the extension pipe. A filter plate is arranged in the extension pipe. The cleaning mechanism is used to clean impurities attached to the filter plate.

[0008] Preferably, the power supply device comprises an energy storage fan blade installed on the side wall of the monitoring box, the bottom of the energy storage fan blade is in contact with the water surface, the energy storage fan blade is driven to rotate by the flow of water, and the rotation of the energy storage fan blade generates electrical energy to power the drive motor; A photovoltaic panel is provided above the monitoring box, and the photovoltaic panel supplies power to the driving motor through light.

[0009] Preferably, the bottom end of the monitoring box is provided with a plurality of water inlets and a water outlet, the plurality of water inlets respectively correspond to the plurality of water pumping chambers, the water inlets are communicated with the water pumping chambers, and the fixed pipe is fixedly connected to the inner side wall of the water inlet; The pumping chamber is communicated with a water outlet, and a one-way valve plate is provided at the tail end of the pumping chamber near the water outlet. A pumping pump body is provided on the fixed pipes corresponding to the multiple pumping chambers. The pumping pump body drives water to flow into the pumping chamber through the water inlet, and the water in the multiple pumping chambers will flow out of the monitoring box through the water outlet.

[0010] Preferably, a floating block is provided outside the monitoring box, which is used to provide buoyancy so that the monitoring box floats on the water surface. The bottom of the monitoring box is connected to a counterweight ball via a traction rope, and the counterweight ball is used to limit the setting position of the monitoring box.

[0011] Preferably, a monitoring tank is provided in the pumping chamber, and the monitoring sensor is located in the monitoring tank.

[0012] Preferably, the monitoring box is rotatably connected with an adjustment shaft in the transverse direction, a transmission chamber is provided in the monitoring box, a moving shaft is rotatably connected in the transmission chamber, and the ends of the moving shaft and the adjustment shaft close to each other are meshed and connected through bevel gears; The inner side wall of the fixed tube is slidably connected to the extension tube, and the outer side wall of the extension tube is threadedly connected to the movable shaft.

[0013] Preferably, the impurity removal mechanism includes a negative pressure plate and a lifting frame arranged in the extension tube, the negative pressure plate is fixedly connected with a negative pressure shaft, the negative pressure shaft passes through the side wall of the extension tube, and the negative pressure shaft outside the extension tube is fixedly connected with a limiting plate, and a negative pressure spring is provided between the limiting plate and the extension tube.

[0014] Preferably, the lifting frame is connected to the inner side wall of the extension tube via a telescopic rod, and a return spring is provided between the two. The negative pressure plate is connected to the lifting frame via a transmission rod, and both ends of the transmission rod are rotatably connected to the negative pressure plate and the lifting frame respectively. A filter plate for filtering impurities in water is provided on the inner side of the lifting frame. A rotating shaft is rotatably connected inside the lifting frame. The rotating shaft is connected to the filter plate. The rotation of the rotating shaft can drive the filter plate to rotate. A rotating gear is provided on the outer side wall of the rotating shaft.

[0015] Preferably, a timing groove is provided on the side wall of the extension tube below the lifting frame in the initial state, a delay cylinder is provided in the timing groove, a start switch is provided on one side of the delay cylinder, a delay block is slidably connected in the timing groove, the delay block is connected to the output end of the delay cylinder, and the delay block contacts the start switch when moving into the timing groove; A rotating rack is provided at the bottom end of the extension tube, and the rotating rack and the rotating gear are adapted to each other. A downward inclined surface and an upward inclined surface are provided on the side of the delay block facing the inside of the extension tube. When the lifting frame moves up or down, the delay block will be pushed into the timing groove.

[0016] Preferably, a pressure cylinder is provided on the side wall of the extension tube close to the bottom end and is arranged along the direction of water flow. The pressure cylinder can accelerate the flow rate of water when passing through the bottom end of the extension tube.

[0017] The beneficial effects of the present invention are: 1. This solution provides an extension tube and a movable axis. When it is necessary to monitor the water quality at different depths, the depth of the extension tube can be manually adjusted to monitor the water at different depths, thereby solving the existing problem of relatively fixed monitoring positions at multiple depths.

[0018] 2. This solution uses the negative pressure plate and delay block to affect the passage of water through the filter plate when too much impurities accumulate on the filter plate, and then the negative pressure plate moves toward the inside of the extension tube under the action of negative pressure, thereby pushing the filter plate to move downward. When the filter plate moves down to a certain position, the filter plate can be rotated at an angle so that the side with the impurities attached can be opposite to the flow direction of the water flow, and then the attached impurities are pushed off the filter plate by the impact of the water flow, thereby deeply cleaning the accumulated impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the position of the water pumping chamber in the present invention; Figure 3 for Figure 2 A in the enlarged view; Figure 4 is a cross-sectional view of the extension tube; Figure 5 is a schematic diagram of the structure of the filter plate; Figure 6 This is the state diagram of the filter plate during cleaning; Figure 7 It is a structural diagram of the delay block; Figure 8 It is a schematic diagram of the structure of the pressurized cylinder.

[0020] In the figure: 1. Monitoring box; 2. Driving motor; 3. Energy storage fan blades; 4. Photovoltaic panel; 5. Floating block; 6. Counterweight ball; 7. Water inlet; 8. Pumping chamber; 9. Monitoring tank; 10. Monitoring sensor; 11. One-way valve plate; 12. Water outlet; 13. Fixed pipe; 14. Extension pipe; 15. Pumping pump body; 16. Traction rope; 17. Moving shaft; 18. Transmission chamber; 19. Adjusting shaft; 20. Bevel gear; 21. Negative pressure plate; 22. Negative pressure shaft; 23. Negative pressure spring; 24. Telescopic rod; 25. Lifting frame; 26. Filter plate; 27. Transmission rod; 28. Rotating shaft; 29. ​​Rotating gear; 30. Delay block; 3001. Downward inclined plane; 3002. Upward inclined plane; 31. Delay cylinder; 32. Start switch; 33. Pressurizing cylinder; 34. Timing groove. DETAILED DESCRIPTION

[0021] 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. Example 1

[0022] A water quality monitoring device for environmental engineering, referring to Figure 1-Figure 8 The water quality detection device comprises a monitoring box 1 and a monitoring sensor 10. The monitoring box 1 is provided with a driving motor 2. The monitoring box 1 floats on the water surface. The water quality detection device monitors the flowing living water. The monitoring box 1 is provided with a power supply device for charging the driving motor 2.

[0023] The power supply device includes an energy storage blade 3 installed on the side wall of the monitoring box 1, the bottom of the energy storage blade 3 is in contact with the water surface, and the energy storage blade 3 is driven to rotate by the flow of water, and the rotation of the energy storage blade 3 generates electricity to power the drive motor 2; a photovoltaic panel 4 is provided above the monitoring box 1, and the photovoltaic panel 4 supplies power to the drive motor 2 through light. The rotation of the energy storage blade 3 and the power provided by the photovoltaic panel 4 under light are conventional means and will not be described in detail.

[0024] The monitoring box 1 is provided with a floating block 5 outside, which is used to provide buoyancy so that the monitoring box 1 floats on the water surface. The bottom of the monitoring box 1 is connected to a counterweight ball 6 through a traction rope 16, and the counterweight ball 6 is used to limit the setting position of the monitoring box 1. Since the monitoring box 1 is set in a flowing water area, the counterweight ball 6 is set to limit the setting position of the monitoring box 1, and the surface monitoring box 1 moves a large distance under the action of the water flow. Example 2

[0025] This embodiment specifically illustrates how to autonomously adjust the water quality of water flows at different depths that need to be monitored by multiple monitoring sensors 10 .

[0026] The bottom of the monitoring box 1 is provided with a plurality of water intake mechanisms immersed in water, and the plurality of water intake mechanisms can autonomously adjust the depth of extension in the water. The monitoring box 1 is provided with a plurality of pumping chambers 8, and the pumping chambers 8 correspond to the water intake mechanisms. The monitoring sensor 10 is arranged in the pumping chamber 8. The pumping chamber 8 is provided with a monitoring slot 9, and the monitoring sensor 10 is located in the monitoring slot 9. When water flows through the monitoring sensor 10, the monitoring sensor 10 can monitor the water quality.

[0027] The bottom end of the monitoring box 1 is provided with a plurality of water inlets 7 and a water outlet 12, the plurality of water inlets 7 respectively correspond to the plurality of water pumping chambers 8, the water inlets 7 are communicated with the water pumping chambers 8, and the fixed pipe 13 is fixedly connected to the inner wall of the water inlet 7; The pumping chamber 8 is communicated with a water outlet 12, and a one-way valve plate 11 is provided at the tail end of the pumping chamber 8 near the water outlet 12. A pumping pump body 15 is provided on the fixed pipes 13 corresponding to the plurality of pumping chambers 8. The pumping pump body 15 drives water to flow into the pumping chamber 8 through the water inlet 7, and the water in the plurality of pumping chambers 8 flows out of the monitoring box 1 through the water outlet 12. The one-way valve plate 11 can prevent water of different depths from being discharged into other pumping chambers 8 during the discharge process, thereby causing errors in monitoring data.

[0028] The water intake mechanism includes a fixed pipe 13 and an extension pipe 14, and the extension pipe 14 can move in the vertical direction relative to the fixed pipe 13. The monitoring box 1 is rotatably connected to an adjustment shaft 19 in the horizontal direction, and a transmission chamber 18 is provided in the monitoring box 1. A moving shaft 17 is rotatably connected in the transmission chamber 18, and the ends of the moving shaft 17 and the adjustment shaft 19 that are close to each other are meshed and connected through a bevel gear 20; The inner wall of the fixed tube 13 is slidably connected to the extension tube 14 , and the outer wall of the extension tube 14 is threadedly connected to the movable shaft 17 .

[0029] Specifically, when it is necessary to monitor water at different depths, the operator can independently rotate one of the adjustment shafts 19, and the movable shaft 17 rotates under the transmission action of the bevel gear 20, and then the extension tube 14 moves down or up through the action of the thread (the specific moving height depends on actual needs). When the bottom end of the extension tube 14 moves to the measured depth, the rotation of the adjustment shaft 19 can be stopped. Then, the water can be pumped through the pump body 15, so that part of the water flow at this depth flows through the corresponding monitoring sensor 10 position, so as to independently monitor the water quality at this depth. Example 3

[0030] This embodiment specifically illustrates the process of cleaning the impurities accumulated on the filter plate 26 .

[0031] The extension tube 14 is provided with a cleaning mechanism, and a filter plate 26 is provided in the extension tube 14. The cleaning mechanism is used to clean the impurities attached to the filter plate 26. Figure 4 When water flows from the extension tube 14 into the water pumping chamber 8 , impurities in the water flow will be blocked by the filter plate 26 and thus accumulated under the filter plate 26 .

[0032] The impurity removal mechanism includes a negative pressure plate 21 and a lifting frame 25 arranged in the extension tube 14, and a negative pressure shaft 22 is fixedly connected to the negative pressure plate 21. The negative pressure shaft 22 passes through the side wall of the extension tube 14, and a limiting plate is fixedly connected to the negative pressure shaft 22 located outside the extension tube 14. A negative pressure spring 23 is provided between the limiting plate and the extension tube 14.

[0033] The lifting frame 25 is connected to the inner wall of the extension tube 14 via a telescopic rod 24, and a return spring is provided between the two. The negative pressure plate 21 is connected to the lifting frame 25 via a transmission rod 27, and both ends of the transmission rod 27 are rotationally connected to the negative pressure plate 21 and the lifting frame 25 respectively.

[0034] When too many impurities accumulate on the filter plate 26, water will be blocked from flowing into the extension tube 14. Because of the presence of the water pump body 15, the extension tube 14 will be in a negative pressure state. The negative pressure in the extension tube 14 will drive the negative pressure plate 21 to move into the extension tube 14 (when the cross-sectional area of ​​the negative pressure shaft 22 in the sliding direction is larger than the area of ​​the filter plate 26, the pressure on the filter plate 26 will be smaller than the pressure on the negative pressure plate 21). During the movement of the negative pressure plate 21, the transmission rod 27 will cause the lifting frame 25 and the filter plate 26 to move downward as a whole.

[0035] A filter plate 26 for filtering impurities in water is provided on the inner side of the lifting frame 25. A rotating shaft 28 is rotatably connected inside the lifting frame 25. The rotating shaft 28 is connected to the filter plate 26. The rotation of the rotating shaft 28 can drive the filter plate 26 to rotate. A rotating gear 29 is provided on the outer side wall of the rotating shaft 28.

[0036] A timing groove 34 is provided on the side wall of the extension tube 14 below the lifting frame 25 in the initial state, and a delay cylinder 31 is provided in the timing groove 34. A start switch 32 is provided on one side of the delay cylinder 31. A delay block 30 is slidably connected in the timing groove 34, and the delay block 30 is connected to the output end of the delay cylinder 31. When the delay block 30 moves into the timing groove 34, it will contact the start switch 32; the delay block 30 is provided with a downward inclined surface 3001 and an upward inclined surface 3002 on the side opposite to the inside of the extension tube 14, and the lifting frame 25 will push the delay block 30 into the timing groove 34 when it moves up or down.

[0037] When the lifting frame 25 moves downward, Figure 6 , the lifting frame 25 will contact the downward inclined surface 3001, thereby causing the delay block 30 to move into the timing groove 34. When the delay block 30 enters the timing groove 34, the delay block 30 will press the start switch 32, and the lifting frame 25 will move to the position of the upward inclined surface 3002. The start switch 32 will cause the delay cylinder 31 to push the delay block 30 to move into the extension tube 14, and then, under the action of the upward inclined surface 3002, the lifting frame 25 moves downward. It should be noted that the bottom end of the delay block 30 is lower than the bottom end of the extension tube 14 (when a gap appears between the filter plate 26 and the extension tube 14, the negative pressure in the extension tube 14 does not exist, and the negative pressure plate 21 will no longer push the lifting frame 25 downward, but the delay block 30 pushes the filter plate 26 downward). It should be noted that when the delay cylinder 31 is controlled by the start switch 32, the delay cylinder 31 lasts for five minutes, which allows the filter plate 26 to have enough time to clean the impurities on its surface through the impact of the water flow.

[0038] The bottom end of the extension tube 14 is provided with a rotating rack, and the rotating rack is adapted to the rotating gear 29. When the upward inclined surface 3002 pushes the lifting frame 25 downward, the rotating gear 29 will mesh with the delay block 30, thereby causing the filter plate 26 to rotate by an angle. Figure 6, the angle of the filter plate 26 in the figure is the angle for cleaning impurities. At this time, the water flow can contact the back of the impurities, and the impurities are cleaned off the filter plate 26 under the impact force of the water flow. Through the arrangement of this method, it is possible to prevent the impurities in the water from flowing into the extension tube 14 as much as possible during the time period of cleaning impurities. Then, when the delay cylinder 31 no longer pushes the delay block 30, the lifting frame 25 will move up under the action of the reset spring, and then move to the initial position. Since the impurities on the filter plate 26 are cleaned, the air pressure in the extension tube 14 is normal, and the negative pressure plate 21 and the filter plate 26 will also move to the initial position. In this way, when too many impurities are accumulated on the filter plate 26, its surface can be cleaned by the impact force of the water flow, and its cleaning efficiency will also be improved due to the change of angle during the cleaning process.

[0039] Reference Figure 8 , Figure 8 The direction of the arrow in is the direction of water flow. A pressure cylinder 33 is provided on the side wall of the extension tube 14 near the bottom, and is arranged along the direction of water flow. The pressure cylinder 33 can accelerate the flow rate of water when it passes through the bottom of the extension tube 14. Specifically, the pressure cylinder 33 is arranged in a hollow rectangular table manner. The water flows from the larger side to the smaller side, the cross-sectional area becomes smaller, and the volume flow rate does not change, so the flow rate of the water flow becomes larger. The setting of the pressure cylinder 33 is a preferred method for cleaning the above-mentioned middle filter plate 26. By this method, the flow rate of the water flow passing through the bottom of the extension tube 14 can be increased, and when it is necessary to clean the impurities on the filter plate 26, its cleaning efficiency is improved.

[0040] 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.

[0041] 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.

[0042] 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 device for environmental engineering, characterized in that: It comprises a monitoring box (1) and a monitoring sensor (10), wherein the monitoring box (1) is provided with a driving motor (2), the monitoring box (1) floats on the water surface, and the monitoring box (1) is provided with a power-charging device for charging the driving motor (2); The bottom of the monitoring box (1) is provided with a plurality of water intake mechanisms immersed in water, the plurality of water intake mechanisms being able to autonomously adjust the depth of their extension in the water, the monitoring box (1) is provided with a plurality of water pumping chambers (8), the water pumping chambers (8) corresponding to the water intake mechanisms, and the monitoring sensor (10) being arranged in the water pumping chamber (8); The water intake mechanism comprises a fixed pipe (13) and an extension pipe (14); the extension pipe (14) is movable in a vertical direction relative to the fixed pipe (13); a debris removal mechanism is provided in the extension pipe (14); a filter plate (26) is provided in the extension pipe (14); the debris removal mechanism is used to clean impurities attached to the filter plate (26).

2. The water quality monitoring device for environmental engineering according to claim 1 is characterized in that: The power supply device comprises an energy storage fan blade (3) mounted on a side wall of the monitoring box (1), the bottom of the energy storage fan blade (3) being in contact with the water surface, the energy storage fan blade (3) being driven to rotate by the flow of water, and the rotation of the energy storage fan blade (3) generating electrical energy to supply power to the drive motor (2); A photovoltaic panel (4) is provided above the monitoring box (1), and the photovoltaic panel (4) supplies power to the driving motor (2) through light.

3. The water quality monitoring device for environmental engineering according to claim 1 is characterized in that: The bottom end of the monitoring box (1) is provided with a plurality of water inlets (7) and a water outlet (12), the plurality of water inlets (7) respectively corresponding to the plurality of water pumping chambers (8), the water inlets (7) being in communication with the water pumping chambers (8), and the fixed pipe (13) being fixedly connected to the inner side wall of the water inlet (7); The pumping chamber (8) is communicated with a water outlet (12), a one-way valve plate (11) is provided at the rear end of the pumping chamber (8) near the water outlet (12), and a pumping pump body (15) is provided on the fixed pipes (13) corresponding to the plurality of pumping chambers (8). The pumping pump body (15) drives water to flow into the pumping chamber (8) through the water inlet (7), and the water in the plurality of pumping chambers (8) flows out of the monitoring box (1) through the water outlet (12).

4. The water quality monitoring device for environmental engineering according to claim 1 is characterized in that: The monitoring box (1) is provided with a floating block (5) outside, the floating block (5) is used to provide buoyancy so that the monitoring box (1) floats on the water surface, and the bottom of the monitoring box (1) is connected to a counterweight ball (6) via a traction rope (16), and the counterweight ball (6) is used to limit the installation position of the monitoring box (1).

5. The water quality monitoring device for environmental engineering according to claim 1 is characterized in that: A monitoring groove (9) is provided in the water pumping chamber (8), and a monitoring sensor (10) is located in the monitoring groove (9).

6. The water quality monitoring device for environmental engineering according to claim 1 is characterized in that: The monitoring box (1) is rotatably connected to an adjustment shaft (19) in the transverse direction, a transmission chamber (18) is provided in the monitoring box (1), a moving shaft (17) is rotatably connected in the transmission chamber (18), and the moving shaft (17) and the adjustment shaft (19) are meshed and connected at their adjacent ends via a bevel gear (20); The inner side wall of the fixed tube (13) is slidably connected to the extension tube (14), and the outer side wall of the extension tube (14) is threadedly connected to the movable shaft (17).

7. The water quality monitoring device for environmental engineering according to claim 1 is characterized in that: The impurity removal mechanism comprises a negative pressure plate (21) and a lifting frame (25) arranged in the extension tube (14); a negative pressure shaft (22) is fixedly connected to the negative pressure plate (21); the negative pressure shaft (22) passes through the side wall of the extension tube (14); a limit plate is fixedly connected to the negative pressure shaft (22) outside the extension tube (14); a negative pressure spring (23) is provided between the limit plate and the extension tube (14).

8. The water quality monitoring device for environmental engineering according to claim 7 is characterized in that: The lifting frame (25) is connected to the inner side wall of the extension tube (14) via a telescopic rod (24), and a return spring is provided between the two. The negative pressure plate (21) is connected to the lifting frame (25) via a transmission rod (27), and the two ends of the transmission rod (27) are respectively rotatably connected to the negative pressure plate (21) and the lifting frame (25); A filter plate (26) for filtering impurities in water is provided on the inner side of the lifting frame (25). A rotating shaft (28) is rotatably connected inside the lifting frame (25). The rotating shaft (28) is connected to the filter plate (26). The rotation of the rotating shaft (28) can drive the filter plate (26) to rotate. A rotating gear (29) is provided on the outer side wall of the rotating shaft (28).

9. The water quality monitoring device for environmental engineering according to claim 8, characterized in that: A timing groove (34) is provided on the side wall of the extension tube (14) below the lifting frame (25) in the initial state, a delay cylinder (31) is provided in the timing groove (34), a start switch (32) is provided on one side of the delay cylinder (31), a delay block (30) is slidably connected in the timing groove (34), the delay block (30) is connected to the output end of the delay cylinder (31), and the delay block (30) contacts the start switch (32) when moving into the timing groove (34); A rotating rack is provided at the bottom end of the extension tube (14), and the rotating rack is adapted to fit with the rotating gear (29). A downward inclined surface (3001) and an upward inclined surface (3002) are provided on the side of the delay block (30) facing the inside of the extension tube (14). When the lifting frame (25) moves up or down, the delay block (30) is pushed into the timing groove (34).

10. The water quality monitoring device for environmental engineering according to claim 1, characterized in that: A pressure cylinder (33) is provided on the side wall of the extension tube (14) near the bottom end and is arranged along the direction of water flow. The pressure cylinder (33) can accelerate the flow rate of water when it passes through the bottom end of the extension tube (14). The pressure cylinder (33) is arranged in the form of a hollow rectangular table, and the side of the pressure cylinder (33) with a larger area is opposite to the flow direction of the water flow.

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