Water quality detection equipment and detection method thereof

Abstract

The invention relates to the technical field of water quality detection, and discloses water quality detection equipment and a detection method thereof.The water quality detection equipment comprises a pretreatment pool, a decontamination module, a water sample feeding module, a filtering module, a synchronous belt, a water quality detector and a self-cleaning module; the water inlet end of the filtering module is communicated with the pretreatment tank through the water sample inlet module, the water outlet end of the filtering module is matched with the water quality detector, a self-cleaning module is arranged in the filtering module, and the self-cleaning module drives the decontamination module to synchronously operate through a synchronous belt. The scraper blade installed on the chain intensively guides oil-film-shaped suspended pollutants to the surface layer collecting box on the water surface, the deposited sludge-shaped suspended pollutants are pushed into the conical pit at the water bottom, the first suction pump is responsible for guiding out the oil-film-shaped suspended pollutants, and removal of the oil-film-shaped suspended pollutants is achieved.

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 water samples 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] Cyanobacteria in suspended substances are widely distributed in the water environment and will multiply in large numbers in hot summer, forming oil film-like floating substances. When filtering during water quality detection, although cyanobacterial cells are small (1 - 10 micrometers) and easily penetrate the filtration part (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, will aggregate into groups and adhere to the surface of the filtration part, causing water flow blockage. In addition, cyanobacteria and their metabolites will accelerate the degree of pollution of the filtration part, 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; The decontamination module includes a main roller, auxiliary rollers, a chain, a scraper, a surface collection box, a first suction pump and a second suction pump. One main roller and three auxiliary rollers are rotatably installed in the pretreatment tank. The main roller and the auxiliary rollers 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 number of scrapers are fixedly arranged on the chain. A surface collection box is fixedly arranged on one side of the pool surface of the pretreatment tank. 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 operates, 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.

[0008] 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. A fine filter screen is arranged in Region II. The water flow direction on the coarse filter screen is from outside to inside, and the water flow direction on the fine filter screen is from inside to outside.

[0009] 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 rotary motor, a shaft tube and a scanner. A water pressure monitoring sensor connected to 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 rotary motor is fixedly installed on the bracket. The output end of the telescopic rotary motor is fixedly connected to the shaft tube. The shaft tube is slidably arranged relative to the second partition. A number 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 rotary motor respectively.

[0010] As a further scheme of the present invention: the water inlet pipe is communicated with the pretreatment tank through the water sample inlet module, and the water outlet pipe is matched with the water quality detector.

[0011] As a further solution of the present invention: the water sample inlet module includes a lift pump, a sampling pipe and a cover body. The lift pump is fixedly arranged at the bottom end of the water inlet pipe. The conveying direction of the lift pump for the water sample is from bottom to top. The bottom of the lift pump is communicated with a sampling pipe, and the sampling pipe extends downward into the water body of the pretreatment tank. A cover body is sleeved at the bottom port of the sampling pipe, and the cover body is conical.

[0012] As a further solution of the present invention: a plurality of probes are arranged on the water quality detector, and the plurality of probes correspond to different detection parameters. The plurality of probes are inserted into the flow channel of the water outlet pipe.

[0013] As a further solution of the present invention: the output end of the telescopic rotary motor includes an inner output end and an outer output end. The inner output end outputs a single rotary motion, and the outer output end outputs a combined motion of synchronous reciprocating telescopic rotation. The inner output end is matched with the main roller body through a synchronous belt, and the outer output end is fixedly connected with the shaft pipe.

[0014] 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 connected to 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, and 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.

[0015] 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 manner. The sewage suction pipe is installed on the first end cover, and a sewage suction port communicated with the sewage suction pipe is opened on the shaft pipe.

[0016] A water quality detection method, applying the above water quality detection equipment, includes the following steps: S1. Import 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; S2. Preliminary impurity removal: The decontamination module operates. The scraper installed on the chain guides the oil film-like suspended pollutants on the water surface to the surface collection box, and pushes the deposited sludge-like suspended pollutants at the bottom of the water to the conical pit. At the same time, start the first suction pump and the second suction pump. The first suction pump is responsible for discharging the oil film-like suspended pollutants, and the second suction pump is responsible for discharging the sludge-like suspended pollutants to separate 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 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. 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; 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.

[0017] The beneficial effects of the present invention are: 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.

[0018] In the present invention, due to the obstruction of the fine filter, a pressure difference is formed on its inner and outer surfaces. When the water pressure monitoring sensor installed here detects the pressure difference, it transmits a signal to the controller. The controller then starts the self-cleaning and sewage discharge program and sends a signal to the sewage valve and the telescopic rotating motor. The sewage valve opens, and at the same time, the telescopic rotating motor drives the shaft tube and the scanner to produce a telescopic and rotating action. Due to the opening of the sewage valve, the filter module is connected to the outside atmosphere and begins to release pressure, generating a strong backwashing water flow, which flows through the sewage valve to the atmosphere. This backwashing water flow generates a suction force at the port of the scanner, so that the oil film-like suspended pollutants originally adsorbed on the surface of the fine filter are discharged from the sewage valve after passing through the shaft tube and the sewage guide port with the water flow into the third area, thereby further removing the oil film-like suspended pollutants.

[0019] In the present invention, the telescopic and rotating motor imparts a telescopic and rotating synchronous action to the scanner, enabling the decontamination effect to cover the entire inner surface of the fine filter screen. The rotating action of the scanner not only plays a role in expanding the decontamination range. For oil film-like suspended pollutants with a high adhesion degree, it is extremely difficult to completely remove them only by suction. Since the port of the scanner fits against the inner wall of the fine filter screen, its rotation will also cause scratching 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, thereby significantly improving the cleaning degree of the fine filter screen. Description of the Drawings

[0020] Figure 1 is a schematic side view structure diagram of an overall water quality detection device proposed by the present invention; Figure 2 is a schematic unfolded structure diagram of a filtering module and a self-cleaning module in a water quality detection device proposed by the present invention; Figure 3 is a schematic diagram of the division of the treatment area of the filtering module in a water quality detection device proposed by the present invention; Figure 4 is a schematic unfolded structure diagram of a sewage discharge valve in a water quality detection device proposed by the present invention; Figure 5 is a schematic diagram of the pollution flow direction when a water quality detection device proposed by the present invention performs the sewage discharge function; Figure 6 is a schematic unfolded structure diagram of a scanner in a water quality detection device proposed by the present invention.

[0021] In the figure: 1, pretreatment tank; 10, conical pit; 2, decontamination module; 21, main roller body; 22, auxiliary roller body; 23, chain; 24, scraper; 25, surface collection box; 26, first suction pump; 27, second suction pump; 3, water sample inlet module; 31, lift pump; 32, sampling pipe; 33, cover body; 4, filtering module; 41, treatment cylinder; 421, first partition; 422, second partition; 43, water inlet pipe; 44, water outlet pipe; 451, coarse filter screen; 452, fine filter screen; 46, support; 5, synchronous belt; 6, water quality detector; 61, probe; 7, self-cleaning module; 71, water pressure monitoring sensor; 72, controller; 73, sewage discharge valve; 731, valve body; 732, input pipe; 733, output pipe; 734, linear actuator; 735, stop block; 74, telescopic and rotating motor; 75, shaft tube; 751, sewage guiding port; 752, sewage suction port; 76, scanner; 761, first end cover; 762, second end cover; 763, sewage suction pipe. Detailed implementation manners

[0022] The subject matter described herein will now 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. Additionally, the features described in some examples can also be combined in other examples.

[0023] 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. 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 secondary 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. One main roller body 21 and three secondary roller bodies 22 are all rotatably installed in the pretreatment tank 1. The main roller body 21 and the secondary roller body 22 are matched through the chain 23 to form a conveying structure that circulates between the water surface layer and the bottom layer 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 continuously pushes water on the water surface layer in the pretreatment tank 1 towards the surface collection box 25, and the scraper 24 continuously pushes water on the water bottom layer in the pretreatment tank 1 towards the second suction pump 27.

[0024] In view of the drawbacks that the 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 sample inlet module 3 is turned on to guide the water sample to the filtration module 4. As the filtration module 4 operates, when it enters the backwashing stage (supplemented and explained later), the self-cleaning module 7 operates, and the decontamination module 2 is driven to operate synchronously through the synchronous belt 5, so that the conveying structure formed by the main roller body 21 and the auxiliary roller body 22 cooperating through the chain 23 to circulate between the water surface and the bottom layer of the water body in the pretreatment tank 1 starts to move. The scraper 24 installed on the chain 23 centrally 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 to the conical pit 10 at the bottom of the water. 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 to separate them from the water sample.

[0025] The second step is carried out in the filtration module 4. Refer to Figure 2 and Figure 3 , the filtration module 4 includes a processing 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 processing 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. The first partition 421 is provided with an interface for communicating Region I and Region II. The bottom of Region I is connected to the water inlet pipe 43, the bottom of Region II is connected to the water outlet pipe 44, the coarse filter screen 451 is arranged in Region I, the fine filter screen 452 is arranged in Region II, the water 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.

[0026] 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.

[0027] 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.

[0028] The self-cleaning module 7 aims to achieve a self-cleaning method that forms backwashing in the filtration module 4. The 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 perform telescopic rotary actions. Due to the opening of the sewage discharge valve 73, the filtration 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 telescopic rotary action 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 action of the scanner 76 not only plays a role in expanding the decontamination range. For the oil film-like suspended pollutants with a relatively high adhesion degree, it is difficult to completely remove them only by suction. Since the port of the scanner 76 is in contact with 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. While scratching, it sucks, thus significantly improving the cleaning degree of the fine filter screen 452.

[0029] 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) that cooperate with the chain 23 are installed on both sides of the main roller body 21 and the auxiliary roller body 22.

[0030] 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, directly take out the coarse filter screen 451 for cleaning or replacement. The relevant content here is prior art and will not be elaborated further.

[0031] Refer to Figure 1 and Figure 2 , the water inlet pipe 43 is connected to the pretreatment tank 1 through the water sampling module 3, and the water outlet pipe 44 cooperates with the water quality detector 6.

[0032] Refer to Figure 1 , 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 lift pump 31 for the water sample is from bottom to top. The bottom of the lift pump 31 is connected to a sampling pipe 32. The sampling pipe 32 extends downward into the water body of the pretreatment tank 1. A cover body 33 is provided at the bottom port of the sampling pipe 32. The cover body 33 is conical.

[0033] The conical cover 33 provided at the end of the sampling pipe 32 when sampling the water sample 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.

[0034] Reference Figure 2 and Figure 3 On the water quality detector 6, a plurality of probes 61 are provided. The plurality of probes 61 correspond to different detection parameters, and the plurality of probes 61 are inserted and arranged in the flow channel of the water outlet pipe 44.

[0035] 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 telescoping rotation. The inner output end is matched with the main roller body 21 through a synchronous belt 5, and the outer output end is fixedly connected with the shaft tube 75.

[0036] Reference Figure 4 The drain valve 73 includes a valve body 731, an input pipe 732, an output pipe 733, a linear actuator 734 and a block 735. One end of the valve body 731 is installed with an input pipe 732 connected to the third area, and the other end is installed with an output pipe 733. A block 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, and the linear actuator 734 drives the block 735 to slide to control the opening and closing of the connection channel between the input pipe 732 and the output pipe 733.

[0037] 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 manner. The sewage suction pipe 763 is installed on the first end cover 761, and a sewage suction port 752 communicated with the sewage suction pipe 763 is opened on the shaft tube 75.

[0038] A water quality detection method using the above water quality detection equipment includes the following steps: S1. Import the water sample: Connect the natural water body to be detected into the pretreatment tank 1, and keep the water surface slightly lower than the surface collection box 25; S2. Preliminary impurity removal: The decontamination module 2 operates. The scraper 24 installed on the chain 23 guides the oil-film-like suspended contaminants on the water surface towards the surface collection box 25, and pushes the deposited sludge-like suspended contaminants at the bottom to the conical pit 10. Meanwhile, 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 contaminants, and the second suction pump 27 is responsible for exporting the sludge-like suspended contaminants, separating them from the water sample. S3. Hierarchical filtration: The water sample is lifted by the water sample inlet module 3 and enters the first region 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 contaminants on the outer wall of the coarse filter screen 451. The water sample after coarse filtration continues to flow and enters the second region from the interface of the first partition 421. Under the filtration of the fine filter screen 452, the smaller suspended contaminants are intercepted inside the fine filter screen 452. S4. Water quality detection: The water sample completely removed of suspended contaminants is exported from the outlet pipe 44 and is detected by the water quality detector 6 during the export flow. At this time, only dissolved substances remain in the water sample, which can more truly reflect the chemical composition of the water body when being detected. 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 then starts the self-cleaning and sewage discharge program, sending signals to the sewage discharge valve 73 and the telescopic rotating motor 74. The sewage discharge valve 73 opens, and at the same time, the telescopic rotating motor 74 drives the shaft tube 75 and the scanner 76 to perform telescopic and rotating actions. The opening of the sewage discharge valve 73 for pressure relief generates a strong backwashing water flow, and a suction force is generated at the port of the scanner 76. The oil-film-like suspended contaminants adsorbed on the surface of the fine filter screen 452 enter the third region with the water flow through the shaft tube 75 and the sewage guiding port 751 and are discharged from the sewage discharge valve 73.

[0039] The embodiments of the present invention have been described above. However, these embodiments are not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative rather than 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 testing device, characterized in that: include: A pretreatment tank (1), a decontamination module (2), an inlet sample module (3), a filter module (4), a synchronous belt (5), a water quality detector (6) and a self-cleaning module (7), wherein the pretreatment tank (1) is provided with a decontamination module (2), the inlet end of the filter module (4) is connected to the pretreatment tank (1) via the inlet sample module (3), the outlet end of the filter module (4) cooperates with the water quality detector (6), and the filter module (4) is provided with a self-cleaning module (7), and the self-cleaning module (7) drives the decontamination module (2) to operate synchronously via the synchronous belt (5); The decontamination module (2) comprises 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). The main roller (21) and the three auxiliary rollers (22) are all rotatably mounted in the pretreatment tank (1). The main roller (21) and the auxiliary rollers (22) cooperate with each other through the chain (23) to form a conveying structure for circulation between the surface layer and the bottom layer of the water body in the pretreatment tank (1). The chain (23) is fixedly provided with a plurality of scrapers (24). 4) A surface collection box (25) is fixedly arranged on one side of the surface of the pretreatment tank (1), and the surface collection box (25) is connected to a first suction pump (26). A conical pit (10) is arranged on one side of the bottom of the pretreatment tank (1), and a second suction pump (27) is plugged into the conical pit (10). As the conveying structure operates, the surface scraper (24) of the water body in the pretreatment tank (1) continuously pushes water toward the surface collection box (25), and the bottom scraper (24) of the water body in the pretreatment tank (1) continuously pushes water toward the second suction pump (27).

2. A water quality testing device according to claim 1, characterized in that: The filtration module (4) comprises 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 first region, a second region and a third region which are continuously distributed by the first partition (421) and the second partition (422); an interface connecting the first region and the second region is provided in the first partition (421); the bottom of the first region is connected to the inlet pipe (43); the bottom of the second region is connected to the outlet pipe (44); a coarse filter (451) is provided in the first region; a fine filter (452) is provided in the second region; the water sample on the coarse filter (451) flows from outside to inside; and the water sample on the fine filter (452) flows from inside to outside.

3. A water quality testing device according to claim 2, characterized in that: The self-cleaning module (7) comprises a water pressure monitoring sensor (71), a controller (72), a drain valve (73), a telescopic rotary motor (74), a shaft tube (75) and a scanner (76); the treatment cylinder (41) is provided with a water pressure monitoring sensor (71) connected to the second region; the controller (72) is fixedly mounted on the top of the outer wall of the treatment cylinder (41); the drain valve (73) is connected to the third region; the bracket (46) is fixedly mounted with a telescopic rotary motor (74); the telescopic rotary motor ( The output end of the shaft tube (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 ports of the scanners (76) are in contact with the inner wall of the fine filter (452), the shaft tube (75) is provided with a sewage guide port (751) in the third area, and the controller (72) is electrically connected to the water pressure monitoring sensor (71), the sewage discharge valve (73) and the telescopic rotating motor (74) respectively.

4. A water quality testing device according to claim 2, characterized in that: 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).

5. A water quality testing device according to claim 2, characterized in that: The water inlet sample module (3) comprises a lifting pump (31), a sampling tube (32) and a cover body (33); the lifting pump (31) is fixedly arranged at the bottom end of the water inlet tube (43); the lifting pump (31) conveys water samples from bottom to top; the bottom of the lifting pump (31) is connected to the sampling tube (32); the sampling tube (32) extends downward into the water body of the pretreatment tank (1); the bottom port of the sampling tube (32) is covered with a cover body (33); the cover body (33) is conical.

6. A water quality testing device according to claim 2, characterized in that: The water quality detector (6) is provided with a plurality of probes (61), the plurality of probes (61) corresponding to different detection parameters, and the plurality of probes (61) are plugged and arranged in the flow channel of the water outlet pipe (44).

7. A water quality testing device according to claim 3, characterized in that: The output end of the telescopic rotary motor (74) comprises an inner output end and an outer output end, the inner output end outputs a single rotational motion, and the outer output end outputs a compound rotational synchronous reciprocating telescopic motion, the inner output end cooperates with the main roller body (21) via a synchronous belt (5), and the outer output end is fixedly connected to the shaft tube (75).

8. A water quality testing device according to claim 3, characterized in that: The sewage discharge valve (73) comprises a valve body (731), an input pipe (732), an output pipe (733), a linear actuator (734) and a stopper (735); an input pipe (732) connected to the third region is installed at one end of the valve body (731), and an output pipe (733) is installed at the other end; a stopper (735) is slidably arranged in the valve body (731) and is located in a connecting passage 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 so as to control the opening and closing of the connecting passage between the input pipe (732) and the output pipe (733).

9. A water quality testing device according to claim 3, 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).

10. A water quality testing method, using the water quality testing device according to any one of claims 1 to 9, 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 (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 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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