A water quality detection device and its detection method

Abstract

The invention relates to the technical field of water quality detection, and discloses a water quality detection device and a detection method thereof. The water quality detection device comprises a pretreatment tank, a decontamination module, an inlet sample module, a filter module, a synchronous belt, a water quality detector and a self-cleaning module. The decontamination module is arranged in the pretreatment tank, the inlet end of the filter module is connected with the pretreatment tank through the inlet sample module, the outlet end of the filter module cooperates with the water quality detector, and the filter module is arranged with a self-cleaning module. The self-cleaning module drives the decontamination module to run synchronously through a synchronous belt. When the self-cleaning module runs, the decontamination module is driven to run synchronously through a synchronous belt. A scraper installed on a chain guides oil film-like suspended pollutants to a surface collection box on the water surface, and pushes deposited sludge-like suspended pollutants to a conical pit at the bottom of the water. A first suction pump is responsible for guiding the oil film-like suspended pollutants to remove the oil film-like suspended pollutants.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality detection, and more specifically, it relates to a water quality detection device and its detection method. Background Art

[0002] Water quality detection is to analyze physical, chemical, and biological indicators in water bodies through scientific methods to evaluate the safety, applicability, and pollution degree of water, and it is applied in aspects such as ensuring drinking water safety, protecting the ecological environment, and supporting industrial and agricultural production.

[0003] Before water quality detection, it is necessary to filter the water sample to distinguish "dissolved state" and "suspended state" substances. Dissolved substances (such as heavy metal ions, nitrates, phosphates, etc.) can pass through the filtration system and reflect the true chemical composition of the water body. Water quality detection is to determine whether the content of dissolved substances exceeds the corresponding range to reflect the specific situation of water quality, while suspended substances (such as sediment, algae, bacteria) will be filtered out to avoid interfering with the determination of dissolved components.

[0004] Blue-green algae in suspended substances are widely distributed in water environments and will multiply in large numbers in hot summers, forming oil film-like floating substances. During the filtration process of water quality detection, although the blue-green algae cells are relatively small (1 - 10 micrometers) and are easy to penetrate the filtration parts (such as filter screens, filter membranes, filter elements, etc.), the floating substances formed after large-scale reproduction are in the form of oil films and gels, which will aggregate into groups and adhere to the surface of the filtration parts, causing water flow blockage. In addition, blue-green algae and their metabolites will accelerate the degree of pollution of the filtration parts, forming a firm biofilm that is difficult to clean, thus affecting the accuracy of water quality detection.

[0005] Existing water quality detection devices have not yet had an effective treatment and response method for the adverse effects brought by oil film-like suspended pollutants, resulting in great limitations in water quality detection of natural waters, and the detection results cannot accurately reflect the water quality status. Therefore, certain improvements are needed. Summary of the Invention

[0006] The present invention provides a water quality detection device and its detection method to solve the technical problem that in related technologies, there is no effective treatment and response method for the adverse effects brought by oil film-like suspended pollutants, resulting in great limitations in water quality detection of natural waters, and the detection results cannot accurately reflect the water quality status.

[0007] The present invention provides a water quality detection device, which includes a pretreatment tank, a decontamination module, a water sample inlet module, a filtration module, a synchronous belt, a water quality detector and a self-cleaning module. A decontamination module is arranged in the pretreatment tank. The water inlet end of the filtration module is connected to the pretreatment tank through the water sample inlet module. The water outlet end of the filtration module is matched with the water quality detector. A self-cleaning module is arranged in the filtration module. The self-cleaning module drives the decontamination module to run synchronously through the synchronous belt;

[0008] The decontamination module includes a main roller body, an auxiliary roller body, a chain, a scraper, a surface collection box, a first suction pump and a second suction pump. One main roller body and three auxiliary roller bodies are rotatably installed in the pretreatment tank. The main roller body and the auxiliary roller body are matched through the chain to form a conveying structure that circulates between the water surface layer and the bottom layer in the pretreatment tank. A plurality of scrapers are fixedly arranged on the chain. A surface collection box is fixedly arranged on one side of the pretreatment tank surface. The surface collection box is communicated with the first suction pump. A conical pit is arranged on one side of the bottom of the pretreatment tank. The second suction pump is inserted into the conical pit. As the conveying structure runs, the scraper on the water surface layer in the pretreatment tank continuously pushes water to the surface collection box, and the scraper on the water bottom layer in the pretreatment tank continuously pushes water to the second suction pump.

[0009] As a further scheme of the present invention: The filtration module includes a processing cylinder, a first partition, a second partition, a water inlet pipe, a water outlet pipe, a coarse filter screen, a fine filter screen and a bracket. The interior of the processing cylinder is divided into continuously distributed Region I, Region II and Region III through the first partition and the second partition. An interface for communicating Region I and Region II is opened in the first partition. The water inlet pipe is connected to the bottom of Region I, the water outlet pipe is connected to the bottom of Region II. A coarse filter screen is arranged in Region I, and a fine filter screen is arranged in Region II. The water flow direction on the coarse filter screen is from the outside to the inside, and the water flow direction on the fine filter screen is from the inside to the outside.

[0010] As a further scheme of the present invention: The self-cleaning module includes a water pressure monitoring sensor, a controller, a sewage discharge valve, a telescopic rotating motor, a shaft tube and a scanner. A water pressure monitoring sensor for accessing Region II is installed on the processing cylinder. The controller is fixedly installed on the top of the outer wall of the processing cylinder. The sewage discharge valve is connected to Region III. A telescopic rotating motor is fixedly installed on the bracket. The output end of the telescopic rotating motor is fixedly connected to the shaft tube. The shaft tube is slidably arranged relative to the second partition. A plurality of scanners are fixedly sleeved on the part of the shaft tube extending into Region II. The ports of the scanners are attached to the inner wall of the fine filter screen. A sewage guiding port is opened on the part of the shaft tube located in Region III. The controller is electrically connected to the water pressure monitoring sensor, the sewage discharge valve and the telescopic rotating motor respectively.

[0011] As a further solution of the present invention: The water inlet pipe is communicated with the pretreatment tank through a water sampling module, and the water outlet pipe is matched with a water quality detector.

[0012] As a further solution of the present invention: The water sampling module includes a lifting pump, a sampling pipe and a cover body. The lifting pump is fixedly arranged at the bottom end of the water inlet pipe. The conveying direction of the water sample by the lifting pump is from bottom to top. The bottom of the lifting pump is communicated with a sampling pipe. The sampling pipe extends downward into the water body of the pretreatment tank. A cover body is arranged at the bottom port of the sampling pipe. The cover body is conical.

[0013] As a further solution of the present invention: A plurality of probes are arranged on the water quality detector. The plurality of probes correspond to different detection parameters. The plurality of probes are inserted and arranged in the flow channel of the water outlet pipe.

[0014] As a further solution of the present invention: The output end of the telescopic and rotary motor includes an inner output end and an outer output end. The inner output end outputs a single rotation action. The outer output end outputs a combined action of synchronous reciprocating telescoping rotation. The inner output end is matched with the main roller body through a synchronous belt. The outer output end is fixedly connected with the shaft pipe.

[0015] As a further solution of the present invention: The sewage discharge valve includes a valve body, an input pipe, an output pipe, a linear actuator and a block. One end of the valve body is provided with an input pipe communicated with the third area, and the other end is provided with an output pipe. A block is slidably arranged in the valve body between the connection channels of the input pipe and the output pipe. A linear actuator is fixedly arranged on one side of the valve body. The linear actuator drives the block to slide to control the opening and closing of the connection channel between the input pipe and the output pipe.

[0016] As a further solution of the present invention: The scanner includes a first end cover, a second end cover and a sewage suction pipe. The first end cover and the second end cover are sleeved on the shaft pipe in a covering shape. The sewage suction pipe is installed on the first end cover. A sewage suction port communicated with the sewage suction pipe is opened on the shaft pipe.

[0017] A water quality detection method, applying the above water quality detection equipment, includes the following steps:

[0018] S1. Importing water sample: Connect the natural water body to be detected into the pretreatment tank, and keep the water surface slightly lower than the surface collection box;

[0019] S2. Preliminary impurity removal: The decontamination module operates. The scraper installed on the chain centrally guides the oil film-like suspended pollutants on the water surface to the surface collection box, and pushes the deposited sludge-like suspended pollutants to the conical pit at the bottom. At the same time, start the first suction pump and the second suction pump. The first suction pump is responsible for exporting the oil film-like suspended pollutants, and the second suction pump is responsible for exporting the sludge-like suspended pollutants to separate them from the water sample;

[0020] S3, graded filtration: The water sample is lifted by the water sample inlet module and enters the first area of ​​the treatment cylinder through the water inlet pipe. Then the water sample first passes through the coarse filter to intercept the larger suspended pollutants on the outer wall of the coarse filter. After the coarse filtration, the water sample continues to flow and enters the second area from the interface of the first partition. Under the filtering action of the fine filter, the smaller suspended pollutants are intercepted in the fine filter.

[0021] S4. Water quality testing: The water sample with suspended pollutants completely removed is discharged from the outlet pipe and tested by the water quality tester during the flow. At this time, only dissolved substances are retained in the water sample, which can more truly reflect the chemical composition of the water body when tested;

[0022] S5. Further impurity removal: The obstruction of the fine filter will form a pressure difference on its inner and outer surfaces. When the water pressure monitoring sensor installed here detects the pressure difference, it transmits the signal to the controller. The controller immediately starts the self-cleaning sewage discharge program and sends a signal to the sewage valve and the telescopic rotating motor. The sewage valve opens. At the same time, the telescopic rotating motor drives the shaft tube and the scanner to produce a telescopic and rotating action. The opening of the sewage valve releases the pressure to produce a strong backwash water flow, which generates a suction force at the port of the scanner. The oil film-like suspended pollutants adsorbed on the surface of the fine filter are followed by the water flow through the shaft tube and the sewage guide port into the third area and then discharged from the sewage valve.

[0023] The beneficial effects of the present invention are:

[0024] When the self-cleaning module of the present invention is running, the decontamination module is driven to run synchronously through the synchronous belt, that is, the conveying structure that circulates between the surface and bottom layers of the water body in the pretreatment tank formed by the cooperation of the main roller and the auxiliary roller through the chain starts to move, and the scraper installed on the chain guides the oil film-like suspended pollutants to the surface collection box on the water surface, and pushes the deposited sludge-like suspended pollutants at the bottom of the water into the conical pit. At the same time, the first suction pump and the second suction pump are started, the first suction pump is responsible for exporting the oil film-like suspended pollutants, and the second suction pump is responsible for exporting the sludge-like suspended pollutants, which are separated from the water sample, thereby realizing the preliminary removal of the oil film-like suspended pollutants.

[0025] In the present invention, due to the blocking of the fine filter screen, a pressure difference will be formed on its inner and outer surfaces. When the water pressure monitoring sensor installed here detects the pressure difference, it will transmit the signal to the controller. The controller will then start the self-cleaning and sewage discharge program, sending signals to the sewage discharge valve and the telescopic rotary motor. The sewage discharge valve opens, and at the same time, the telescopic rotary motor drives the shaft tube and the scanner to perform telescopic rotary movements. Due to the opening of the sewage discharge valve, the filter module is connected to the outside atmosphere, starting to release pressure, generating a very strong backwash water flow that flows through the sewage discharge valve to the atmosphere. This backwash water flow generates a suction force at the port of the scanner. In this way, the oil film-like suspended pollutants originally adsorbed on the surface of the fine filter screen enter the third region through the shaft tube and the sewage guiding port with the water flow and are discharged from the sewage discharge valve, realizing the further removal of the oil film-like suspended pollutants.

[0026] In the present invention, the telescopic rotary motor endows the scanner with synchronous telescopic and rotary movements, enabling the decontamination effect to cover the entire inner surface of the fine filter screen. The rotary movement of the scanner not only plays a role in expanding the decontamination range. For the oil film-like suspended pollutants with relatively high adhesion, it is difficult to completely remove them only by suction. Since the port of the scanner is in contact with the inner wall of the fine filter screen, its rotation will also cause scraping on the inner wall of the fine filter screen, breaking the excessive adhesion of the oil film-like suspended pollutants and dispersing them. While scraping, it sucks, thus significantly improving the cleaning degree of the fine filter screen. Brief Description of the Drawings

[0027] Figure 1 is a schematic side view structure diagram of an overall water quality detection device proposed by the present invention;

[0028] Figure 2 is a schematic unfolded structure diagram of a filter module and a self-cleaning module in a water quality detection device proposed by the present invention;

[0029] Figure 3 is a schematic diagram of the division of the treatment area of the filter module in a water quality detection device proposed by the present invention;

[0030] Figure 4 is a schematic unfolded structure diagram of a sewage discharge valve in a water quality detection device proposed by the present invention;

[0031] Figure 5 is a schematic diagram of the pollution flow direction during the sewage discharge function of a water quality detection device proposed by the present invention;

[0032] Figure 6 is a schematic unfolded structure diagram of a scanner in a water quality detection device proposed by the present invention.

[0033] In the figure:

[0034] 1. Pretreatment tank; 10. Conical pit;

[0035] 2. Decontamination module; 21. Main roller body; 22. Sub-roller body; 23. Chain; 24. Scraper; 25. Surface collection box; 26. First suction pump; 27. Second suction pump;

[0036] 3. Water sample inlet module; 31. Lift pump; 32. Sampling pipe; 33. Cover;

[0037] 4. Filtration module; 41. Processing cylinder; 421. First partition; 422. Second partition; 43. Water inlet pipe; 44. Water outlet pipe; 451. Coarse filter screen; 452. Fine filter screen; 46. Bracket;

[0038] 5. Synchronous belt;

[0039] 6. Water quality detector; 61. Probe;

[0040] 7. Self-cleaning module; 71. Water pressure monitoring sensor; 72. Controller; 73. Drain valve; 731. Valve body; 732. Input pipe; 733. Output pipe; 734. Linear actuator; 735. Stop block; 74. Telescopic rotary motor; 75. Shaft tube; 751. Dirt guiding port; 752. Dirt suction port; 76. Scanner; 761. First end cover; 762. Second end cover; 763. Dirt suction pipe. Detailed implementation manners

[0041] Now, the subject matter described herein will be discussed with reference to exemplary implementation manners. It should be understood that discussing these implementation manners is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. In addition, the features described in some examples can also be combined in other examples.

[0042] As Figure 1 - Figure 6 shown, a water quality detection device includes a pretreatment tank 1, a decontamination module 2, a water sample inlet module 3, a filtration module 4, a synchronous belt 5, a water quality detector 6, and a self-cleaning module 7. The decontamination module 2 is arranged in the pretreatment tank 1. The water inlet end of the filtration module 4 is connected to the pretreatment tank 1 through the water sample inlet module 3. The water outlet end of the filtration module 4 is matched with the water quality detector 6. The self-cleaning module 7 is arranged in the filtration module 4. The self-cleaning module 7 drives the decontamination module 2 to run synchronously through the synchronous belt 5;

[0043] The decontamination module 2 includes a main roller 21, an auxiliary roller 22, a chain 23, a scraper 24, a surface collection box 25, a first suction pump 26 and a second suction pump 27. One main roller 21 and three auxiliary rollers 22 are rotatably installed in the pretreatment tank 1. The main roller 21 and the auxiliary roller 22 cooperate with each other through the chain 23 to form a conveying structure for circulation between the surface and bottom layers of the water body in the pretreatment tank 1. A plurality of scrapers 24 are fixedly arranged on the chain 23. A surface collection box 25 is fixedly arranged on one side of the surface of the pretreatment tank 1. The surface collection box 25 is connected to the first suction pump 26. A conical pit 10 is arranged on one side of the bottom of the pretreatment tank 1. The second suction pump 27 is plugged into the conical pit 10. As the conveying structure runs, the surface scraper 24 of the water body in the pretreatment tank 1 continuously pushes the surface collection box 25, and the bottom scraper 24 of the water body in the pretreatment tank 1 continuously pushes the second suction pump 27.

[0044] In order to solve the problem that oil film-like suspended pollutants interfere with water sample detection and are difficult to remove, the present invention establishes a "two-step" removal method. The first step is carried out in the pretreatment tank 1 through the decontamination module 2. First, the natural water body to be detected is connected to the pretreatment tank 1, and the water surface is kept slightly lower than the surface collection box 25. Then the water inlet module 3 is turned on to guide the water sample to the filter module 4. As the filter module 4 runs and enters the backwashing stage (explained later), the self-cleaning module 7 runs, and the decontamination module 2 is driven to run synchronously through the synchronous belt 5. Even if The conveying structure for circulation between the surface and bottom layers of the water body in the pretreatment tank 1 formed by the cooperation of the main roller 21 and the auxiliary roller 22 through the chain 23 starts to move, and the scraper 24 installed on the chain 23 guides the oil film-like suspended pollutants to the surface collection box 25 on the water surface, and pushes the deposited sludge-like suspended pollutants at the bottom of the water into the conical pit 10. At the same time, the first suction pump 26 and the second suction pump 27 are started. The first suction pump 26 is responsible for exporting the oil film-like suspended pollutants, and the second suction pump 27 is responsible for exporting the sludge-like suspended pollutants and separating them from the water sample.

[0045] The second step is carried out in the filter module 4, refer to Figure 2 and Figure 3The filter module 4 includes a treatment cylinder 41, a first partition 421, a second partition 422, an inlet pipe 43, an outlet pipe 44, a coarse filter 451, a fine filter 452 and a bracket 46. The interior of the treatment cylinder 41 is divided into a continuously distributed first region, a second region and a third region by the first partition 421 and the second partition 422. The first partition 421 is provided with an interface connecting the first region and the second region. The bottom of the first region is connected to the inlet pipe 43, and the bottom of the second region is connected to the outlet pipe 44. A coarse filter 451 is arranged in the first region, and a fine filter 452 is arranged in the second region. The water sample flows from the coarse filter 451 from the outside to the inside, and the water sample flows from the inside to the outside on the fine filter 452.

[0046] After the oil film-like suspended pollutants on the surface of the water sample are initially removed in the pretreatment tank 1, the water sample is lifted by the water sample inlet module 3 and enters the first area of ​​the treatment cylinder 41 through the water inlet pipe 43. The water sample then passes through the coarse filter 451 to intercept larger suspended pollutants on the outer wall of the coarse filter 451. The water sample after coarse filtration continues to flow and enters the second area from the interface of the first partition 421. Under the filtering action of the fine filter 452, smaller suspended pollutants (including oil film-like suspended pollutants that have not been completely removed in the pretreatment tank 1) are intercepted in the fine filter 452. The water sample with the suspended pollutants completely removed is discharged from the outlet pipe 44 and detected by the water quality detector 6 on the way out. Since only dissolved substances are retained in the water sample at this time, it can more truly reflect the chemical composition of the water body when being detected, thereby improving the accuracy of the detection results.

[0047] At this time, some of the oil film-like suspended pollutants adhering to the inner wall of the fine filter 452 in the filter module 4 have not been removed. Long-term operation will weaken the filtering performance of the fine filter 452. In this regard, the self-cleaning module 7 begins to play a role. Figure 2 and Figure 3 The self-cleaning module 7 includes a water pressure monitoring sensor 71, a controller 72, a drain valve 73, a telescopic rotating motor 74, a shaft tube 75 and a scanner 76. The treatment tube 41 is provided with a water pressure monitoring sensor 71 connected to the second area. The controller 72 is fixedly installed on the top of the outer wall of the treatment tube 41. The drain valve 73 is connected to the third area. The bracket 46 is fixedly provided with a telescopic rotating motor 74. The output end of the telescopic rotating motor 74 is fixedly connected to the shaft tube 75. The shaft tube 75 is slidably arranged relative to the second partition 422. The shaft tube 75 extending into the second area is fixedly sleeved with a plurality of scanners 76. The port of the scanner 76 is in contact with the inner wall of the fine filter 452. The shaft tube 75 is provided with a sewage guide port 751 on the part located in the third area. The controller 72 is electrically connected to the water pressure monitoring sensor 71, the drain valve 73 and the telescopic rotating motor 74 respectively.

[0048] The self-cleaning module 7 aims at a self-cleaning method that forms backwashing in the filtering module 4. Its principle is that due to the blockage of the fine filter screen 452, a pressure difference will be formed on its inner and outer surfaces. When the water pressure monitoring sensor 71 installed here detects the pressure difference, it transmits a signal to the controller 72. The controller 72 then starts the self-cleaning and sewage discharge program, sending signals to the sewage discharge valve 73 and the telescopic rotary motor 74. The sewage discharge valve 73 opens, and at the same time, the telescopic rotary motor 74 drives the shaft tube 75 and the scanner 76 to produce telescopic rotary movements. Due to the opening of the sewage discharge valve 73, the filtering module 4 is connected to the outside atmosphere, starting to relieve pressure, generating a very strong backwashing water flow that flows through the sewage discharge valve 73 to the atmosphere. This backwashing water flow generates a suction force at the port of the scanner 76. In this way, the oil film-like suspended pollutants originally adsorbed on the surface of the fine filter screen 452 enter the third region through the shaft tube 75 and the sewage guiding port 751 with the water flow and are discharged from the sewage discharge valve 73. The rotary synchronous telescopic movement given by the telescopic rotary motor 74 to the scanner 76 enables this decontamination effect to cover the entire inner surface of the fine filter screen 452. The rotary movement of the scanner 76 not only plays a role in expanding the decontamination range. For the oil film-like suspended pollutants with relatively high adhesion, it is difficult to completely remove them only by suction. Since the port of the scanner 76 fits against the inner wall of the fine filter screen 452, its rotation will also cause scratching on the inner wall of the fine filter screen 452, breaking the excessive adhesion of the oil film-like suspended pollutants and dispersing them, scraping and sucking at the same time, thus significantly improving the cleaning degree of the fine filter screen 452.

[0049] It should be specifically noted that the reason why the main roller body 21 and the auxiliary roller body 22 can drive the chain 23 to move is that gear-shaped chain plates (not shown in the figure) cooperating with the chain 23 are installed on both sides of the main roller body 21 and the auxiliary roller body 22.

[0050] In addition, for the cleaning of the coarse filter screen 451, after impurities have accumulated for a period of time, as Figure 2 shown, open the end cover of the treatment cylinder 41, and directly take out the coarse filter screen 451 for cleaning or replacement. The related content here is prior art and will not be elaborated further.

[0051] Refer to Figure 1 and Figure 2 , the water inlet pipe 43 is connected to the pretreatment tank 1 through the water inlet sample module 3, and the water outlet pipe 44 cooperates with the water quality detector 6.

[0052] Refer to Figure 1, the water sample inlet module 3 includes a lift pump 31, a sampling pipe 32 and a cover 33. The lift pump 31 is fixedly arranged at the bottom end of the water inlet pipe 43. The conveying direction of the lift pump 31 for the water sample is from bottom to top. The bottom of the lift pump 31 is communicated with the sampling pipe 32. The sampling pipe 32 extends downward into the water body of the pretreatment tank 1. A cover 33 is sleeved at the bottom port of the sampling pipe 32. The cover 33 is conical.

[0053] When sampling water, the conical cover 33 arranged at the end of the sampling pipe 32 can preliminarily block suspended impurities due to its inverted structure surface opposite to the water flow, avoiding excessive suspended impurities from entering the filtration module 4 and affecting the impurity removal efficiency of the self-cleaning module 7.

[0054] Reference Figure 2 and Figure 3 , a plurality of probes 61 are arranged on the water quality detector 6. The plurality of probes 61 correspond to different detection parameters. The plurality of probes 61 are inserted and arranged in the flow channel of the water outlet pipe 44.

[0055] Reference Figure 1 and Figure 2 , the output end of the telescopic rotary motor 74 includes an inner output end and an outer output end. The inner output end outputs a single rotary motion. The outer output end outputs a composite motion of synchronous reciprocating telescopic rotation. The inner output end is cooperated with the main roller body 21 through a synchronous belt 5. The outer output end is fixedly connected with the shaft tube 75.

[0056] Reference Figure 4 , the sewage discharge valve 73 includes a valve body 731, an input pipe 732, an output pipe 733, a linear actuator 734 and a stopper 735. One end of the valve body 731 is installed with an input pipe 732 communicated with the third region. The other end is installed with an output pipe 733. A stopper 735 is slidably arranged in the valve body 731 between the connection channels of the input pipe 732 and the output pipe 733. A linear actuator 734 is fixedly arranged on one side of the valve body 731. The linear actuator 734 drives the stopper 735 to slide to control the opening and closing of the connection channel between the input pipe 732 and the output pipe 733.

[0057] Reference Figure 5 and Figure 6 , the scanner 76 includes a first end cover 761, a second end cover 762 and a sewage suction pipe 763. The first end cover 761 and the second end cover 762 are sleeved on the shaft tube 75 in a covering shape. The sewage suction pipe 763 is installed on the first end cover 761. A sewage suction port 752 communicated with the sewage suction pipe 763 is opened on the shaft tube 75.

[0058] A water quality detection method, applying the above water quality detection equipment, includes the following steps:

[0059] S1. Introduction of water sample: Connect the natural water body to be detected to the pretreatment tank 1, and keep the water surface slightly lower than the surface collection box 25;

[0060] S2. Preliminary impurity removal: The decontamination module 2 operates. The scraper 24 installed on the chain 23 guides the oil film-like suspended pollutants on the water surface towards the surface collection box 25, and pushes the deposited sludge-like suspended pollutants at the bottom to the conical pit 10. At the same time, start the first suction pump 26 and the second suction pump 27. The first suction pump 26 is responsible for exporting the oil film-like suspended pollutants, and the second suction pump 27 is responsible for exporting the sludge-like suspended pollutants to separate them from the water sample;

[0061] S3. Hierarchical filtration: Lift the water sample through the water inlet module 3, enter the first area of the treatment cylinder 41 through the water inlet pipe 43. Then the water sample first passes through the coarse filter screen 451, intercepting the larger suspended pollutants on the outer wall of the coarse filter screen 451. The water sample after coarse filtration continues to flow, enters the second area from the interface of the first partition 421, and under the filtration of the fine filter screen 452, the smaller suspended pollutants are intercepted inside the fine filter screen 452;

[0062] S4. Water quality detection: The water sample completely removed of suspended pollutants is exported from the water outlet pipe 44 and is detected by the water quality detector 6 during the export flow. At this time, only dissolved substances are retained in the water sample, which can more truly reflect the chemical composition of the water body when being detected;

[0063] S5. Further impurity removal: Due to the blockage of the fine filter screen 452, a pressure difference will be formed on its inner and outer surfaces. When the water pressure monitoring sensor 71 installed here detects the pressure difference, it transmits a signal to the controller 72. The controller 72 immediately starts the self-cleaning and sewage discharge program, sends signals to the sewage discharge valve 73 and the telescopic rotary motor 74. The sewage discharge valve 73 opens, and at the same time the telescopic rotary motor 74 drives the shaft tube 75 and the scanner 76 to produce telescopic rotary movements. The opening and pressure relief of the sewage discharge valve 73 generate a strong backwashing water flow, and a suction force is generated at the port of the scanner 76. The oil film-like suspended pollutants adsorbed on the surface of the fine filter screen 452 enter the third area with the water flow through the shaft tube 75 and the sewage guiding port 751 and are discharged from the sewage discharge valve 73.

[0064] The embodiments of the present invention are described above, but the embodiments are not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A water quality detection device, characterized in that, Including: A pretreatment tank (1), a decontamination module (2), a water sample inlet module (3), a filtration module (4), a synchronous belt (5), a water quality detector (6) and a self-cleaning module (7). A decontamination module (2) is arranged in the pretreatment tank (1). The water inlet end of the filtration module (4) is connected to the pretreatment tank (1) through the water sample inlet module (3). The water outlet end of the filtration module (4) is matched with the water quality detector (6). A self-cleaning module (7) is arranged in the filtration module (4). The self-cleaning module (7) drives the decontamination module (2) to run synchronously through the synchronous belt (5); The decontamination module (2) includes a main roller body (21), a sub-roller body (22), a chain (23), a scraper (24), a surface collection box (25), a first suction pump (26) and a second suction pump (27). A main roller body (21) and three sub-roller bodies (22) are all rotatably installed in the pretreatment tank (1). The main roller body (21) and the sub-roller body (22) are matched through the chain (23) to form a conveying structure for circulating between the surface and the bottom of the water body in the pretreatment tank (1). A plurality of scrapers (24) are fixedly arranged on the chain (23). A surface collection box (25) is fixedly arranged on one side of the pool surface of the pretreatment tank (1). The surface collection box (25) is communicated with the first suction pump (26). A conical pit (10) is arranged on one side of the bottom of the pretreatment tank (1). The second suction pump (27) is inserted into the conical pit (10). As the conveying structure operates, the scraper (24) on the surface of the water body in the pretreatment tank (1) continuously pushes towards the surface collection box (25), and the scraper (24) on the bottom of the water body in the pretreatment tank (1) continuously pushes towards the second suction pump (27); The filtration module (4) includes a treatment cylinder (41), a first partition (421), a second partition (422), a water inlet pipe (43), a water outlet pipe (44), a coarse filter screen (451), a fine filter screen (452) and a bracket (46). The inside of the treatment cylinder (41) is divided into a continuously distributed Region I, Region II and Region III by the first partition (421) and the second partition (422). An interface for conducting Region I and Region II is opened in the first partition (421). The water inlet pipe (43) is connected to the bottom of Region I. The water outlet pipe (44) is connected to the bottom of Region II. A coarse filter screen (451) is arranged in Region I. A fine filter screen (452) is arranged in Region II. The water sample flow direction on the coarse filter screen (451) is from outside to inside, and the water sample direction on the fine filter screen (452) is from inside to outside; The self-cleaning module (7) includes a water pressure monitoring sensor (71), a controller (72), a sewage discharge valve (73), a telescopic rotary motor (74), a shaft tube (75) and a scanner (76). The water pressure monitoring sensor (71) accessing the second area is installed on the treatment cylinder (41). The controller (72) is fixedly installed on the top of the outer wall of the treatment cylinder (41). The sewage discharge valve (73) is connected to the third area. The telescopic rotary motor (74) is fixedly installed on the support (46). The output end of the telescopic rotary motor (74) is fixedly connected to the shaft tube (75). The shaft tube (75) is slidably arranged relative to the second partition (422). A plurality of scanners (76) are fixedly sleeved on the part of the shaft tube (75) extending into the second area. The ports of the scanners (76) are attached to the inner wall of the fine filter screen (452). A sewage guiding port (751) is formed in the part of the shaft tube (75) located in the third area. The controller (72) is electrically connected to the water pressure monitoring sensor (71), the sewage discharge valve (73) and the telescopic rotary motor (74) respectively.

2. The water quality detection device according to claim 1, characterized in that, The water inlet pipe (43) is communicated with the pretreatment tank (1) through the water sampling module (3). The water outlet pipe (44) is matched with the water quality detector (6).

3. A water quality detection device according to claim 1, characterized in that, The water sampling module (3) includes a lift pump (31), a sampling pipe (32) and a cover body (33). The lift pump (31) is fixedly arranged at the bottom end of the water inlet pipe (43). The conveying direction of the water sample by the lift pump (31) is from bottom to top. The bottom of the lift pump (31) is communicated with the sampling pipe (32). The sampling pipe (32) extends downward into the water body of the pretreatment tank (1). A cover body (33) is sleeved at the bottom port of the sampling pipe (32). The cover body (33) is in a conical shape.

4. A water quality detection device according to claim 1, characterized in that, A plurality of probes (61) are arranged on the water quality detector (6). The plurality of probes (61) correspond to different detection parameters. The plurality of probes (61) are inserted into the flow channel of the water outlet pipe (44).

5. A water quality detection device according to claim 1, characterized in that, The output end of the telescopic rotary motor (74) includes an inner output end and an outer output end. The inner output end outputs a single rotation action. The outer output end outputs a combined action of synchronous reciprocating telescoping rotation. The inner output end is matched with the main roller body (21) through a synchronous belt (5). The outer output end is fixedly connected to the shaft tube (75).

6. A water quality detection device according to claim 1, characterized in that, The sewage discharge valve (73) includes a valve body (731), an input pipe (732), an output pipe (733), a linear actuator (734) and a stopper (735). An input pipe (732) communicated with the third area is installed at one end of the valve body (731). An output pipe (733) is installed at the other end. A stopper (735) is slidably arranged in the valve body (731) in the connection channel between the input pipe (732) and the output pipe (733). A linear actuator (734) is fixedly arranged on one side of the valve body (731). The linear actuator (734) drives the stopper (735) to slide to control the opening and closing of the connection channel between the input pipe (732) and the output pipe (733).

7. A water quality detection device according to claim 1, characterized in that, The scanner (76) comprises a first end cover (761), a second end cover (762) and a sewage suction pipe (763); the first end cover (761) and the second end cover (762) are sleeved on the shaft tube (75) in a covering manner; the sewage suction pipe (763) is installed on the first end cover (761); and the shaft tube (75) is provided with a sewage suction port (752) connected to the sewage suction pipe (763).

8. A water quality detection method, which uses the water quality detection device described in any one of claims 1-7, and is characterized in that, The following steps are involved: S1. Introducing water samples: Place the natural water body to be tested into the pretreatment pool (1), keeping the water surface slightly lower than the surface collection box (25); S2, preliminary impurity removal: the decontamination module (2) is running, and the scraper (24) installed on the chain (23) guides the oil film-like suspended pollutants on the water surface to the surface collection box (25) and pushes the deposited sludge-like suspended pollutants on the bottom of the water into the conical pit (10). At the same time, the first suction pump (26) and the second suction pump (27) are started. The first suction pump (26) is responsible for exporting the oil film-like suspended pollutants, and the second suction pump (27) is responsible for exporting the sludge-like suspended pollutants and separating them from the water sample; S3, graded filtration: the water sample is lifted by the water sample inlet module and enters the first area of ​​the treatment cylinder (41) through the water inlet pipe (43), and then the water sample first passes through the coarse filter (451), and the larger suspended pollutants are intercepted on the outer wall of the coarse filter (451). After the coarse filtration, the water sample continues to flow and enters the second area from the interface of the first partition (421). Under the filtering action of the fine filter (452), the smaller suspended pollutants are intercepted in the fine filter (452); S4, water quality testing: the water sample from which the suspended pollutants have been completely removed is discharged from the outlet pipe (44) and tested by the water quality tester (6) during the discharge flow. At this time, only dissolved substances are retained in the water sample, which can more truly reflect the chemical composition of the water body when being tested; S5. Further impurity removal: The fine filter (452) blocks the inner and outer surfaces of the fine filter. When the water pressure monitoring sensor (71) installed therein detects the pressure difference, it transmits a signal to the controller (72). The controller (72) then starts the self-cleaning and sewage discharge program and sends a signal to the sewage discharge valve (73) and the telescopic rotating motor (74). The sewage discharge valve (73) opens. At the same time, the telescopic rotating motor (74) drives the shaft tube (75) and the scanner (76) to produce a telescopic and rotating action. The opening of the sewage discharge valve (73) releases the pressure to produce a strong backwashing water flow, which generates a suction force at the port of the scanner (76). The oil film-like suspended pollutants adsorbed on the surface of the fine filter (452) are carried by the water flow through the shaft tube (75) and the sewage guide port (751) into the third area and then discharged from the sewage discharge valve (73).

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