An environmental protection monitoring device

Abstract

The present invention belongs to the field of environmental monitoring technology, and in particular relates to an environmental protection monitoring device, comprising a base, and also comprising: a support and retractable mechanism, a limit guide mechanism, a water level detection feedback mechanism, an offset confirmation mechanism, a water quality detection mechanism, and an automatic cleaning mechanism. The present invention can realize fully automatic water quality monitoring, effectively improve the monitoring efficiency of the water environment, and can automatically adjust the depth of water quality monitoring based on the water level, so that the higher the water level, the shallower the water quality monitoring depth, and the lower the water level, the deeper the water quality monitoring depth, so as to realize more effective water quality monitoring. When collecting water samples, it can automatically monitor whether the automatic sampling mechanism has offset problems due to the flow of water, and automatically adjust the relative position of the automatic sampling mechanism to ensure that the automatic sampling mechanism is in an accurate sampling position.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmental monitoring, and in particular relates to an environmental protection monitoring device. Background Art

[0002] Water bodies are an important part of the ecosystem. The quality of water directly affects the survival and reproduction of aquatic organisms. Monitoring water quality can help us understand the changes in indicators such as dissolved oxygen, pH, and nutrients in the water body, promptly detect the trend of water quality deterioration, take corresponding measures to protect the habitat of aquatic organisms, and maintain the balance and stability of the ecosystem. Currently, the quality of water bodies is monitored at intervals through relevant monitoring equipment, such as an environmental protection monitoring device and its monitoring method proposed in patent announcement number CN118777536A.

[0003] In the process of monitoring water quality, it is necessary to lower the water sampler into the water body, take samples of the water and then send them to the water quality sensor to detect the water quality. When sampling the water body, the sampling depth is fixed, but the water level of rivers, lakes and other water bodies will change with factors such as seasons and precipitation. During the period of rising water levels, the mixing degree of the water body increases, and the difference in water quality at different depths will decrease, but it will also carry more surface pollutants, because the new water volume mainly comes from surface runoff, and surface runoff will carry a large amount of surface pollutants during its flow, such as soil particles, fertilizers, pesticides, garbage, etc. These pollutants enter the water body. After entering the water body, pollutants will first be distributed in the surface and middle layers of the water body. Due to the carrying effect of the water flow and the influence of gravity, pollutants are more easily diffused and mixed in the upper layer of the water body. At this time, the sampling depth can be relatively shallow, and the focus can be on the surface and middle layer water samples. During the water level drop period, when the water level drops, the water flow speed slows down and the mixing effect of the water body weakens. At the same time, due to the differences in temperature, density and other characteristics of water bodies at different depths, the water body will be stratified. At the bottom of the water body, a large amount of nutrients, heavy metals, organic matter and other pollutants are usually adsorbed and accumulated in the sediment. When the water level drops, the interface conditions between the sediment and the water body change, such as dissolved oxygen content and pH value, making it easier for pollutants in the sediment to be released into the water body. These released pollutants will directly affect the water quality of the bottom water body, resulting in an increase in the concentration of pollutants in the bottom water body. Therefore, in order to accurately monitor water quality changes, it is necessary to appropriately increase the collection of bottom water samples. Therefore, water quality monitoring work at a fixed depth cannot well represent the quality of the water body, affecting the accuracy of water quality monitoring. Summary of the Invention

[0004] The purpose of the present invention is to provide an environmental protection monitoring device in view of the above problems.

[0005] To achieve the above-mentioned object, the present invention adopts the following technical solution: an environmental protection monitoring device, comprising a base, and further comprising:

[0006] A supporting retractable mechanism is fixedly mounted on the upper end of the base;

[0007] An automatic sampling mechanism, fixedly mounted on the movable end of the supporting and retracting mechanism;

[0008] A limit guide mechanism is fixedly mounted on one side of the support and retractable mechanism, is transmission-connected to the support and retractable mechanism, and is electrically connected to a PLC controller. The PLC controller controls the start and stop of the support and retractable mechanism based on a signal fed back by the limit guide mechanism.

[0009] A water level detection feedback mechanism is fixedly mounted on one side of the position limiting guide mechanism and is electrically connected to a PLC controller. The PLC controller self-regulates the rotation threshold of the position limiting guide mechanism based on a signal fed back by the water level detection feedback mechanism, thereby confirming the lowering depth of the automatic sampling mechanism.

[0010] An offset confirmation mechanism is fixedly mounted at the lower end of the position limiting guide mechanism and is electrically connected to a PLC controller. The PLC controller controls the automatic sampling mechanism to reset based on a signal fed back by the offset confirmation mechanism.

[0011] A water quality detection mechanism is fixedly mounted on the upper end of the base and is arranged on one side of the supporting and retracting mechanism;

[0012] The automatic cleaning mechanism is fixedly mounted on the upper end of the base and is arranged on one side of the water quality detection mechanism.

[0013] In the above-mentioned environmental protection monitoring equipment, the supporting and retracting mechanism includes a supporting cylinder fixedly mounted on the upper end of the base, the internal rotatable connection of the supporting cylinder is provided with a supporting column, the upper end of the supporting column passes through the upper end of the supporting cylinder, and the bottom of the inner wall of the supporting cylinder is fixedly provided with a rotating motor for driving the supporting column to rotate, the upper end of the supporting column is fixedly connected to a supporting plate, the side wall of the supporting plate is fixedly plugged with two electric push rods, the moving ends of the two electric push rods are fixedly connected to the same L-shaped mounting plate, the upper end of the horizontal part of the L-shaped mounting plate is fixedly provided with a winding machine, and the winding machine is wound with a retracting rope.

[0014] In the above-mentioned environmental protection monitoring equipment, the automatic sampling mechanism includes a hollow collecting seat fixedly installed at the lower end of the retraction rope, a counterweight cone head is fixedly installed at the lower end of the hollow collecting seat, two electric telescopic rods are fixedly installed on the upper side of the interior of the hollow collecting seat, the lower movable ends of the two electric telescopic rods are fixedly connected to the same negative pressure piston plate, the negative pressure piston plate is sealingly connected to the hollow collecting seat, the lower end of the hollow collecting seat is fixedly connected to a collecting tube, and a plurality of electric propellers are evenly fixedly installed on the outer wall of the hollow collecting seat.

[0015] In the above-mentioned environmental protection monitoring equipment, the limiting guide mechanism includes an extension plate fixedly mounted on one side of the upper end of the L-shaped mounting plate, and the end of the extension plate away from the L-shaped mounting plate is fixedly connected to a guide frame, and the inner wall of the guide frame is rotatably connected to a guide wheel, and the retraction rope passes around the outside of the guide wheel. The side wall of the guide frame is also provided with a guide hole for the retraction rope to pass through and extend into, and an encoder is fixedly mounted on the outer wall of the guide frame, and the input end of the encoder is fixedly connected to the wheel axle of the guide wheel.

[0016] In the above-mentioned environmental protection monitoring equipment, the water level detection feedback mechanism includes a transverse plate fixedly mounted on one side of the guide frame, and an ultrasonic water level meter is fixedly mounted on the transverse plate.

[0017] In the above-mentioned environmental protection monitoring equipment, the offset confirmation mechanism includes a connecting plate fixedly installed at the lower end of the guide frame, and the lower end side wall of the connecting plate is fixedly connected to a fixed ring, and the fixed ring is arranged outside the retraction rope. The inner wall of the fixed ring is evenly fixedly connected with a plurality of pressure switches distributed in a ring, and the pressure switches are arranged to be tilted downward.

[0018] In the above-mentioned environmental protection monitoring equipment, the water quality detection mechanism includes a water collecting box fixedly installed on the upper end of the base, a drain pipe is installed on the bottom side wall of the water collecting box, and an electric control valve is provided on the drain pipe, an electric push-pull rod is rotatably installed on the side wall of the water collecting box, and a motor drive assembly for driving the electric push-pull rod to rotate is fixedly installed on the outer wall of the water collecting box, the upper end of the electric push-pull rod is fixedly connected to a lifting rod with an L-shaped structure, and the lifting rod is fixedly connected to a water quality sensor at one end away from the electric push-pull rod.

[0019] In the above-mentioned environmental protection monitoring equipment, the automatic cleaning mechanism includes a bracket fixedly mounted on the upper end of the base, the upper end of the bracket is fixedly connected to a hollow cleaning cylinder, the inner side wall of the hollow cleaning cylinder is evenly fixedly connected to a plurality of flushing nozzles, the side wall of the hollow cleaning cylinder is fixedly connected to a water inlet pipe, and an electrically controlled on-off valve is installed on the water inlet pipe.

[0020] Compared with the existing technology, the beneficial effects of the present invention are:

[0021] 1. Through the setting of the support and retracting mechanism, automatic sampling mechanism, limit guide mechanism, water quality detection mechanism, and automatic cleaning machine, it can realize fully automatic water quality monitoring, effectively improve the monitoring efficiency of the water environment, and effectively ensure the accuracy of each water quality monitoring, avoiding the problem of dirt adhering to the surface of the water quality sensor affecting the monitoring accuracy.

[0022] 2. Through the set water level detection feedback mechanism, limit guide mechanism, and support and retraction mechanism, the depth of water quality monitoring can be automatically adjusted based on the water level height, so that the higher the water level height, the shallower the water quality monitoring depth, and the lower the water level height, the deeper the water quality monitoring depth, so as to achieve more effective water quality monitoring. It can effectively solve the problem of inaccurate water quality monitoring caused by fixed sampling depth due to the influence of factors such as precipitation, upstream water, and seasonal changes on river water level, and the fluctuation of lake water level due to seasonal precipitation, evaporation and changes in the amount of water entering the river.

[0023] 3. Through the offset confirmation mechanism and automatic sampling mechanism, when collecting water samples, it is possible to automatically monitor whether the automatic sampling mechanism has offset problems due to the flow of water, and automatically adjust the relative position of the automatic sampling mechanism to ensure that the automatic sampling mechanism is in the correct sampling position, thereby effectively ensuring the accuracy of water sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the sampling preparation state of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the present invention in a sampling completion state;

[0027] Figure 4 It is a schematic cross-sectional view of the supporting and retracting mechanism of the present invention;

[0028] Figure 5 It is a schematic cross-sectional view of the automatic sampling mechanism of the present invention;

[0029] Figure 6 It is a schematic structural diagram of the position limiting guide mechanism and the offset confirmation mechanism of the present invention;

[0030] Figure 7 It is a structural diagram of the water level detection feedback mechanism of the present invention;

[0031] Figure 8 It is a schematic cross-sectional view of the water quality detection mechanism of the present invention;

[0032] Figure 9 It is a schematic cross-sectional view of the automatic cleaning mechanism of the present invention.

[0033] In the figure: 1 base, 2 support and retracting mechanism, 21 support cylinder, 22 support column, 23 rotating motor, 24 support plate, 25 electric push rod, 26 L-shaped mounting plate, 27 winder, 28 retracting and releasing rope, 3 automatic sampling mechanism, 31 hollow collection seat, 32 counterweight cone head, 33 electric telescopic rod, 34 negative pressure piston plate, 35 collection tube, 36 electric propeller, 4 limit guide mechanism, 41 extension plate, 42 guide frame, 43 guide wheel, 44 encoder, 5 water level detection feedback mechanism, 51 horizontal plate, 52 ultrasonic water level gauge, 6 offset confirmation mechanism, 61 connecting plate, 62 fixed ring, 63 pressure switch, 7 water quality detection mechanism, 71 water collection box, 72 electric push-pull rod, 73 motor drive assembly, 74 lifting rod, 75 water quality sensor, 8 automatic cleaning mechanism, 81 bracket, 82 hollow cleaning cylinder, 83 flushing nozzle, 84 water inlet pipe, 85 electric control on-off valve. DETAILED DESCRIPTION

[0034] 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.

[0035] like Figures 1-9 As shown, an environmental protection monitoring device includes a base 1 and also includes:

[0036] The support and retraction mechanism 2 is fixedly mounted on the upper end of the base 1. The support and retraction mechanism 2 includes a support tube 21 fixedly mounted on the upper end of the base 1. The internal rotation of the support tube 21 is connected to a support column 22. The upper end of the support column 22 passes through the upper end of the support tube 21. A rotating motor 23 for driving the support column 22 to rotate is fixedly mounted on the bottom of the inner wall of the support tube 21. The upper end of the support column 22 is fixedly connected to a support plate 24. Two electric push rods 25 are fixedly inserted into the side wall of the support plate 24. The moving ends of the two electric push rods 25 are fixedly connected to the same L-shaped mounting plate 26. A winder 27 is fixedly mounted on the upper end of the horizontal part of the L-shaped mounting plate 26. A winder 27 is wound on the winder 27. A winder rope 28 is wound on the winder 27.

[0037] The automatic sampling mechanism 3 is fixedly mounted on the movable end of the support and retraction mechanism 2. The automatic sampling mechanism 3 includes a hollow collecting seat 31 fixedly mounted on the lower end of the retraction rope 28. A counterweight cone head 32 is fixedly mounted on the lower end of the hollow collecting seat 31. Two electric telescopic rods 33 are fixedly mounted on the upper inner side of the hollow collecting seat 31. The lower movable ends of the two electric telescopic rods 33 are fixedly connected to the same negative pressure piston plate 34. The negative pressure piston plate 34 is sealingly sleeved with the hollow collecting seat 31. The lower end of the hollow collecting seat 31 is fixedly connected to a collecting tube 35. A plurality of electric propellers 36 are evenly fixedly mounted on the outer wall of the hollow collecting seat 31.

[0038] The limiting guide mechanism 4 is fixedly mounted on one side of the supporting and retracting mechanism 2, is transmission-connected to the supporting and retracting mechanism 2, and is electrically connected to the PLC controller. The PLC controller controls the start and stop of the supporting and retracting mechanism 2 based on the signal fed back by the limiting guide mechanism 4. The limiting guide mechanism 4 includes an extension plate 41 fixedly mounted on one side of the upper end of the L-shaped mounting plate 26. The end of the extension plate 41 away from the L-shaped mounting plate 26 is fixedly connected to a guide frame 42. The inner wall of the guide frame 42 is rotatably connected to a guide wheel 43. The retracting rope 28 passes around the guide wheel 43. The side wall of the guide frame 42 is also provided with a guide hole for the retracting rope 28 to pass through. An encoder 44 is fixedly mounted on the outer wall of the guide frame 42. The input end of the encoder 44 is fixedly connected to the axle of the guide wheel 43.

[0039] The water level detection feedback mechanism 5 is fixedly mounted on one side of the limit guide mechanism 4 and is electrically connected to the PLC controller. The PLC controller self-regulates the rotation threshold of the limit guide mechanism 4 based on the signal fed back by the water level detection feedback mechanism 5, thereby confirming the lowering depth of the automatic sampling mechanism 3. The water level detection feedback mechanism 5 includes a horizontal plate 51 fixedly mounted on one side of the guide frame 42, and an ultrasonic water level meter 52 is fixedly mounted on the horizontal plate 51.

[0040] The offset confirmation mechanism 6 is fixedly mounted on the lower end of the limit guide mechanism 4 and is electrically connected to the PLC controller. The PLC controller controls the automatic sampling mechanism 3 to reset and move based on the signal fed back by the offset confirmation mechanism 6. The offset confirmation mechanism 6 includes a connecting plate 61 fixedly mounted on the lower end of the guide frame 42. The lower end side wall of the connecting plate 61 is fixedly connected to a fixed ring 62. The fixed ring 62 is sleeved on the outside of the retraction rope 28. The inner wall of the fixed ring 62 is evenly fixedly connected to a plurality of pressure switches 63 distributed in a ring shape. The pressure switch 63 is tilted downward.

[0041] The water quality detection mechanism 7 is fixedly mounted on the upper end of the base 1 and is arranged on one side of the support and retracting mechanism 2. The water quality detection mechanism 7 includes a water collecting box 71 fixedly mounted on the upper end of the base 1. A drain pipe is installed on the bottom side wall of the water collecting box 71, and an electric control valve is provided on the drain pipe. An electric push-pull rod 72 is rotatably installed on the side wall of the water collecting box 71. A motor drive assembly 73 for driving the electric push-pull rod 72 to rotate is fixedly mounted on the outer wall of the water collecting box 71. The upper end of the electric push-pull rod 72 is fixedly connected to a lifting rod 74 with an L-shaped structure, and the lifting rod 74 is fixedly connected to the end of the water quality sensor 75 away from the electric push-pull rod 72.

[0042] The automatic cleaning mechanism 8 is fixedly mounted on the upper end of the base 1 and is arranged on one side of the water quality detection mechanism 7. The automatic cleaning mechanism 8 includes a bracket 81 fixedly mounted on the upper end of the base 1. The upper end of the bracket 81 is fixedly connected to a hollow cleaning cylinder 82. The inner side wall of the hollow cleaning cylinder 82 is evenly fixedly connected to a plurality of flushing nozzles 83. The side wall of the hollow cleaning cylinder 82 is fixedly connected to a water inlet pipe 84. An electrically controlled on-off valve 85 is installed on the water inlet pipe 84.

[0043] The operating principle of the present invention is now described as follows: when water environment monitoring is required, the PLC controller controls the electric push rod 25 to push the L-shaped mounting plate 26 to move, so that the automatic sampling mechanism 3 moves to the upper side of the water surface, and the PLC controller controls the ultrasonic water level meter 52 to work, quickly detect the water level height, and feed back the water level height signal to the PLC controller. The PLC controller controls the encoder 44 on the limit guide mechanism 4 to adjust the set rotation threshold. Specifically, the higher the water level, the smaller the rotation threshold of the encoder 44 is set. Conversely, the lower the water level, the larger the rotation threshold of the encoder 44 is set, thereby automatically adjusting the depth of subsequent water quality sampling;

[0044] The PLC controller controls the operation of the winder 27, and the winder 27 cooperates with the retracting rope 28 to drive the automatic sampling mechanism 3 to move downward. The guide wheel 43 limits and guides the retracting rope 28, so that the retracting rope 28 can drive the automatic sampling mechanism 3 to be lowered stably. Because of the operation of the ultrasonic water level meter 52, the distance between the automatic sampling mechanism 3 and the water surface can be confirmed. When the lower end of the automatic sampling mechanism 3 moves to the water surface, the encoder 44 feeds back a signal to the PLC controller. The PLC controller receives the signal to confirm that the automatic sampling mechanism 3 has officially started to be lowered. At this time, the PLC controller controls the encoder 44 to start counting again. The length of the retracting rope 28 that has been lowered represents the lowering depth of the automatic sampling mechanism 3, and the guide wheel 43 will be synchronized with the lowering of the retracting rope 28. The rotation of the encoder 44 drives the encoder 44 to rotate, which can realize the confirmation of the lowering depth of the automatic sampling mechanism 3. When the number of rotations of the encoder 44 reaches the set threshold, it indicates that the automatic sampling mechanism 3 has moved down to the corresponding depth position in the water body. At this time, the PLC controller controls the winder 27 to stop working, and determines whether the pressure switch 63 in the fixed ring 62 is pressed. When the position of the automatic sampling mechanism 3 is offset due to the flow of water, the automatic sampling mechanism 3 will drive the retracting rope 28 to press the pressure switch 63 at the corresponding position. At this time, the pressure switch 63 feeds back a signal to the PLC controller, and the PLC controller controls the electric propeller 36 at the corresponding position on the outer wall of the hollow collection seat 31 to move, thereby providing a reverse pressure to the hollow collection seat 31. The thrust is used to overcome the flow force of the water flow, ensuring that the hollow collection seat 31 moves to the accurate sampling position. When all pressure switches 63 are not pressed and triggered, it means that the hollow collection seat 31 is in the accurate position. At this time, the PLC controller controls the electric telescopic rod 33 to move, and the electric telescopic rod 33 drives the negative pressure piston plate 34 to move upward in the hollow collection seat 31, thereby forming a negative pressure suction force in the hollow collection seat 31, and cooperating with the collection tube 35 to collect the water sample at the corresponding depth position into the hollow collection seat 31. At this time, the PLC controller controls the reel 27 to move in the opposite direction, pulling the hollow collection seat 31 out of the water, ensuring that the hollow collection seat 31 moves to the accurate sampling position. The real water quality data at the current position can be obtained by maintaining the current sampling position. Continuous monitoring, even if the water quality changes due to the flow of water, can accumulate a series of data, so as to analyze the change pattern of water quality over time, which is of great significance for studying the self-purification ability of water bodies, the migration and transformation patterns of pollutants, and evaluating the impact of environmental changes on water quality. When comparing water quality monitoring in different areas or at different times of the same water body, only by ensuring that the position of each sampling point is accurate and fixed can the collected data be comparable and consistent, so as to accurately judge the differences in water quality in different areas and the development trend of water quality in the same area, and provide a reliable basis for the management and decision-making of the water environment. When the detection depth of the hollow collection seat 31 is adjusted by retracting the rope 28, when the hollow collection seat 31 is offset, according to the trigonometric function relationship,When the upper end of the retractable rope 28 presses on the pressure switch 63, it means that the deflection angle of the hollow collection seat 31 driven by the retractable rope 28 has reached the threshold value, indicating that the relative offset distance of the hollow collection seat 31 has been very large, which will have a great impact on both the sampling position and the sampling depth, and will affect the sampling accuracy;

[0045] The PLC controller then controls the rotation motor 23 to move, and the rotation motor 23 drives the support column 22 to rotate 180 degrees, so that the automatic sampling mechanism 3 moves to the upper end of the water collection box 71. At this time, the PLC controller controls the winding machine 27 to drive the automatic sampling mechanism 3 to move downward, so that the lower end of the hollow collection seat 31 moves into the water collection box 71. The PLC controller then controls the electric telescopic rod 33 to push the negative pressure piston plate 34 downward, and the water sample in the hollow collection seat 31 is transferred to the water collection box 71. Then, the automatic sampling mechanism 3 is moved by the support and retracting mechanism 2. To the initial position, at this time, the PLC controller controls the electric push-pull rod 72 to push the lifting rod 74 to move upward, and the lifting rod 74 drives the water quality sensor 75 to move upward synchronously, and then starts the motor drive component 73, and the motor drive component 73 drives the electric push-pull rod 72 to rotate 180 degrees, so that the water quality sensor 75 moves to the upper end of the water collection box 71, and then drives the water quality sensor 75 downward through the electric push-pull rod 72, so that the water quality sensor 75 extends into the water collection box 71 to quickly detect the quality of the water sample, and feeds back the detected water quality information to the monitoring terminal;

[0046] When the water sample test is completed, the PLC controller controls the electric control valve on the drain pipe on the bottom side wall of the water collecting box 71 to open, drain the water in the water collecting box 71, and move the water quality sensor 75 to the cleaning cylinder again. At this time, the PLC controller opens the electric control on-off valve 85 on the water inlet pipe 84, and the water inlet pipe 84 is connected to the municipal water pipe, so that water flows into the water inlet pipe 84 and is sprayed out of the water quality sensor 75 through multiple flushing nozzles 83, effectively cleaning the water quality sensor 75 to avoid the problem of dirt adhering to the water quality sensor 75 affecting the accuracy of water quality monitoring.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An environmental protection monitoring device, comprising a base, characterized in that: Also includes: PLC controller; The support and retraction mechanism is fixedly mounted on the upper end of the base; the support and retraction mechanism includes a support cylinder fixedly mounted on the upper end of the base, the internal rotation of the support cylinder is connected to a support column, the upper end of the support column passes through the upper end of the support cylinder, and a rotating motor for driving the support column to rotate is fixedly mounted on the bottom of the inner wall of the support cylinder, the upper end of the support column is fixedly connected to a support plate, and two electric push rods are fixedly sleeved on the side wall of the support plate, and the moving ends of the two electric push rods are fixedly connected to the same L-shaped mounting plate, and a winder is fixedly mounted on the upper end of the horizontal part of the L-shaped mounting plate, and a winding machine is wound on the winding machine. The automatic sampling mechanism is fixedly mounted on the movable end of the supporting retractable mechanism; the automatic sampling mechanism has a hollow collecting seat connected to the lower end of the retractable rope, and a plurality of electric propellers are evenly fixedly mounted on the outer wall of the hollow collecting seat; The limit guide mechanism is fixedly mounted on one side of the support and retractable mechanism, is in transmission connection with the support and retractable mechanism, and is electrically connected to the PLC controller; the PLC controller controls the start and stop operation of the support and retractable mechanism based on the signal fed back by the limit guide mechanism; The water level detection feedback mechanism is fixedly mounted on one side of the limit guide mechanism and is electrically connected to the PLC controller. The water level detection feedback mechanism includes an ultrasonic water level gauge. The PLC controller self-regulates the rotation threshold of the limit guide mechanism based on the signal fed back by the water level detection feedback mechanism, thereby confirming the lowering depth of the automatic sampling mechanism. The PLC controller is configured such that the higher the water level, the shallower the water quality monitoring depth, and the lower the water level, the deeper the water quality monitoring depth. The offset confirmation mechanism is fixedly mounted at the lower end of the position-limiting guide mechanism and is electrically connected to the PLC controller. The offset confirmation mechanism includes a connecting plate fixedly mounted at the lower end of the position-limiting guide mechanism. A fixed ring is fixedly connected to the side wall of the lower end of the connecting plate. The fixed ring is sleeved outside the retraction rope. A plurality of pressure switches arranged in an annular pattern are evenly fixedly connected to the inner wall of the fixed ring. The pressure switches are arranged to be tilted downward. The PLC controller controls the operation of the electric propeller at the corresponding position based on the signal fed back by the offset confirmation mechanism to ensure that the hollow collection seat moves to the accurate sampling position. The water quality detection mechanism is fixedly mounted on the upper end of the base and is arranged on one side of the supporting retractable mechanism; The automatic cleaning mechanism is fixedly mounted on the upper end of the base and is arranged on one side of the water quality detection mechanism.

2. An environmental protection monitoring device according to claim 1, characterized in that: A counterweight cone head is fixedly installed at the lower end of the hollow collecting seat, and two electric telescopic rods are fixedly installed on the upper inner side of the hollow collecting seat. The lower movable ends of the two electric telescopic rods are fixedly connected to the same negative pressure piston plate, and the negative pressure piston plate is sealed and sleeved with the hollow collecting seat. The lower end of the hollow collecting seat is fixedly connected to a collection tube.

3. An environmental protection monitoring device according to claim 1, characterized in that: The limiting guide mechanism includes an extension plate fixedly mounted on one side of the upper end of the L-shaped mounting plate, the end of the extension plate away from the L-shaped mounting plate is fixedly connected to a guide frame, the inner wall of the guide frame is rotatably connected to a guide wheel, the retraction rope passes around the outside of the guide wheel, and the side wall of the guide frame is also provided with a guide hole for the retraction rope to pass through and extend into, an encoder is fixedly mounted on the outer wall of the guide frame, and the input end of the encoder is fixedly connected to the wheel axle of the guide wheel.

4. An environmental protection monitoring device according to claim 3, characterized in that: The water level detection feedback mechanism comprises a horizontal plate fixedly arranged on one side of the guide frame, and an ultrasonic water level meter is fixedly arranged on the horizontal plate.

5. An environmental protection monitoring device according to claim 1, characterized in that: The water quality detection mechanism includes a water collecting box fixedly installed on the upper end of the base, a drain pipe is installed on the bottom side wall of the water collecting box, and an electric control valve is provided on the drain pipe, an electric push-pull rod is rotatably installed on the side wall of the water collecting box, and a motor drive assembly for driving the electric push-pull rod to rotate is fixedly installed on the outer wall of the water collecting box, the upper end of the electric push-pull rod is fixedly connected to a lifting rod with an L-shaped structure, and the end of the lifting rod away from the electric push-pull rod is fixedly connected to a water quality sensor.

6. An environmental protection monitoring device according to claim 1, characterized in that: The automatic cleaning mechanism includes a bracket fixedly mounted on the upper end of the base, the upper end of the bracket is fixedly connected to a hollow cleaning cylinder, the inner side wall of the hollow cleaning cylinder is evenly fixedly connected to multiple flushing nozzles, the side wall of the hollow cleaning cylinder is fixedly connected to a water inlet pipe, and an electrically controlled on-off valve is installed on the water inlet pipe.

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