Electrode method water quality detector with cleaning and calibration functions and detection method

Abstract

The invention relates to an electrode method water quality detector with cleaning and calibration functions and a detection method, and belongs to the technical field of water quality detection. The electrode method water quality detector with the cleaning and calibrating functions comprises a plurality of measuring electrodes, a circular plate, an electric linear module, a rotary driving assembly, a workbench, a plurality of detection cups, a plurality of cleaning devices and a waste liquid collecting box. The water sample detection method comprises the steps of liquid preparation, detection cup pretreatment, electrode alignment and insertion, water sample parameter detection, cleaning after detection, measurement electrode cleaning, measurement electrode calibration and the like. According to the invention, the detection efficiency, the result accuracy and the equipment durability are considered, the method is suitable for batch and continuous water quality detection scenes, the labor cost and the detection error can be effectively reduced, and the overall quality of water quality detection work is improved.

Description

Technical Field

[0001] This application belongs to the field of water quality testing technology, specifically relating to an electrode-based water quality analyzer and testing method with cleaning and calibration functions. Background Technology

[0002] In fields such as environmental monitoring, water conservancy projects, industrial wastewater treatment, and drinking water safety assurance, accurate detection of water quality parameters is a core element in achieving water quality control. Electrode methods, as a mature water quality testing technology, are widely used to determine key parameters such as pH, dissolved oxygen, conductivity, and turbidity in water samples due to their advantages of ease of operation, rapid response, and real-time monitoring. The core principle of this technology is to utilize the electrochemical or physical interaction between the detection end of the measuring electrode and the water sample to convert water quality parameters into identifiable electrical signals, thereby achieving quantitative analysis of water quality indicators. Its detection accuracy directly depends on the cleanliness and stability of the measuring electrode's detection end and the rationality of the testing procedure.

[0003] However, existing electrode-based water sample testing technologies and related devices mostly rely on single methods such as high-pressure water rinsing or low-pressure air purging for cleaning the measuring electrodes, lacking a targeted mechanism for treating stubborn dirt. Biofilms, suspended particles, and organic adhesive impurities commonly found in water samples tend to adhere tightly to the electrode's detection surface. Water rinsing alone can only remove loose surface dirt and cannot effectively remove these stubborn deposits; while simple air purging only achieves a drying function and has no cleaning effect on already adhered dirt.

[0004] Existing electrode-based water quality monitoring devices mostly employ a single electrode, single test cup, and single cleaning station design. The testing process must follow a sequential pattern of testing, electrode removal, cleaning, drying, and then testing again; that is, the next water sample can only be tested after the previous electrode has been cleaned and dried. For multi-parameter testing scenarios, it is necessary to frequently change different types of electrodes or use the same electrode alternately for multiple water samples. The waiting time for cleaning accounts for more than 50% of the testing cycle, resulting in excessively long testing times. Although some devices are equipped with multiple electrodes, the layout of the cleaning and testing stations lacks coordinated design. Electrode switching and station transitions rely on manual operation, resulting in low automation and a high risk of operational errors. This makes it impossible to achieve a parallel operation mode where testing and cleaning are performed simultaneously, leading to low overall testing efficiency and failing to meet the needs of rapid testing of batch water samples. Summary of the Invention

[0005] The technical problem to be solved by this application is to overcome the shortcomings of the prior art and provide an electrode-based water quality analyzer and detection method with cleaning and calibration functions. This application takes into account detection efficiency, result accuracy and equipment durability, and is suitable for batch and continuous water quality detection scenarios. It can effectively reduce labor costs and detection errors and improve the overall quality of water quality detection work.

[0006] The technical solution adopted in this application to solve the problems existing in the prior art is: An electrode-based water quality analyzer with cleaning and calibration functions includes several measuring electrodes, a circular plate, an electric linear module, a rotary drive assembly, a worktable, several test cups, several cleaning devices, and a waste liquid collection tank.

[0007] The measuring electrode is detachably connected to the circular plate, and the measuring electrode is arranged vertically with the detection end located below the circular plate.

[0008] The electric linear module drives the circular plate to move up and down, while the rotary drive assembly controls the rotation of the circular plate to adjust the orientation of each measuring electrode.

[0009] The electric linear module is fixedly connected to the workbench via a mounting bracket. The detection cups and cleaning devices are arranged at intervals on the workbench and are distributed in a circular array around the axis of the circular plate. The bottom of the detection cup is equipped with a first drain pipe, which is connected in series with a shut-off valve and its end is connected to the waste liquid collection tank.

[0010] The workbench is equipped with a distilled water tank, a testing water tank, a calibration water tank, and a high-pressure air supply assembly.

[0011] The testing tank and calibration tank are connected to the main supply pipe via water pipes equipped with water pumps and shut-off valves.

[0012] The distilled water tank outlet pipe is connected in series with a water pump, a first three-way valve and a second three-way valve. The first three-way valve is connected to the test water tank through a first bypass pipe, the second three-way valve is connected to the cleaning device through a second bypass pipe, and the end of the main supply pipe is connected to the test cup.

[0013] Furthermore, the rotary drive assembly includes a telescopic control device and a rack, wherein the telescopic control device controls the extension and retraction of the rack.

[0014] A gear is fixed at the top of the rotating shaft. When the circular plate moves up to the top dead center, the gear meshes with the rack.

[0015] Furthermore, a rotating shaft is coaxially fixed above the circular plate, and positioning holes are recessed on the rotating shaft and distributed radially thereon.

[0016] The circular plate is connected to the sliding part of the electric linear module through a connecting frame. The end of the connecting frame is provided with a sleeve that is fitted outside the rotating shaft. The sleeve is provided with a through hole corresponding to the positioning insertion hole.

[0017] The connecting frame is fixed with a guide bracket and a rope fixing bracket.

[0018] The push rod is horizontally arranged and slidably connected to the sliding hole on the guide bracket. A spring seat is fixed on the push rod, and the spring is sleeved on the push rod with its two ends abutting against the spring seat and the guide bracket, respectively. In the free state, the end of the push rod passes through the through hole and is inserted into the positioning insertion hole. The pull rope is fixed between the end of the push rod away from the sleeve and the pull rope fixing bracket.

[0019] The fork is positioned directly above the connecting frame, which has an opening corresponding to the fork. The bottom of the fork has a groove corresponding to the pull rope. When the circular plate moves up to the upper stop point, the groove presses down on the pull rope, causing the top rod to disengage from the positioning hole.

[0020] Furthermore, the inner wall of the detection cup is recessed with a spiral groove, and a first liquid inlet pipe is connected to the outside, with the first liquid inlet pipe communicating with the top port of the spiral groove.

[0021] The opening of the test cup is covered with a top cover, and the top cover has a through hole in the center. The inner diameter of the through hole is larger than the outer diameter of the test end of the measuring electrode.

[0022] Furthermore, the cleaning device includes a cleaning cup, a ring-shaped water pipe, and a pneumatic assembly.

[0023] The cleaning cup is open at the top and has a second drain pipe that runs through the bottom. The second drain pipe is connected in series with a shut-off valve and its end is connected to the waste liquid collection tank.

[0024] An annular water pipe is coaxially installed inside the cleaning cup, and has a through hole that is inclined downwards towards the inside. A second liquid inlet pipe that communicates with the annular water pipe is installed outside the cleaning cup.

[0025] The pneumatic assembly is connected to the air intake pipe outside the cleaning cup, and the annular water pipe is located below the pneumatic assembly, with both closely attached to the inner wall of the cleaning cup.

[0026] Furthermore, the cleaning cup is equipped with a cleaning component located between the annular water pipe and the pneumatic assembly, which includes a retaining ring and several brushes.

[0027] The outer wall of the snap ring abuts against the inner wall of the cleaning cup, and the brush is fixed to the inner side of the snap ring.

[0028] The inner wall of the cleaning cup has a protruding support ring, and the bottom surface of the snap ring abuts against the top surface of the support ring.

[0029] Furthermore, the pneumatic assembly includes two fixed rings arranged at an interval between each other and a rotating ring, both of which are coaxial with the cleaning cup.

[0030] The fixing ring includes a support ring, with a retaining ring and a mounting ring protruding from the inner and outer ends of the support ring, respectively. The mounting ring is fixedly connected to the inner wall of the cleaning cup, and the support rings of the two fixing rings are located on the upper and lower sides of the through hole between the air inlet pipe and the cleaning cup, respectively.

[0031] The inner wall of the rotating ring has recessed grooves on both the upper and lower sides, which engage with the retaining ring. Several jet pipes are fixed in the middle of the rotating ring, and the jet pipes communicate with the inner cavity formed by the rotating ring and the fixed ring. The jet pipes emit air at their outlets to form a tangential airflow.

[0032] The bottom of the rotating ring is provided with an air jet hole that is arranged downward on the inner side. The air jet hole connects the inner cavity of the above-mentioned inner cavity with the inner cavity of the cleaning cup. The outside of the rotating ring is fixedly connected to the snap ring by several connecting rods.

[0033] Furthermore, the connection port between the main liquid supply pipe and the calibration water tank is closest to the first liquid inlet pipe, while the connection port between the main liquid supply pipe and the distilled water tank is furthest from the first liquid inlet pipe. The high-pressure gas supply assembly includes an air compressor, a high-pressure gas cylinder, a pressure regulating valve, and corresponding connecting gas pipes.

[0034] A water sample testing method includes the following steps: S01, Liquid Preparation: Fill the testing tank with a sufficient amount of water sample to be tested, fill the distilled water tank with distilled water, and ensure that the waste liquid collection tank is empty.

[0035] S02, Pre-treatment of the test cup: The water sample to be tested is injected into the test cup through the first inlet pipe. The spiral groove on the inner wall of the test cup guides the water sample to form a vortex to clean the test cup. At the same time, the shut-off valve on the first drain pipe is opened so that the cleaned water sample to be tested flows into the waste liquid collection tank.

[0036] After cleaning, close the shut-off valve on the first drain pipe and inject the water sample to be tested into the test cup to the test height, ensuring that the test end can be completely immersed in the water sample after the measuring electrode is moved down.

[0037] S03, Electrode Alignment and Insertion: In the initial state, the circular plate is near the bottom dead center. The push rod is inserted into the positioning hole of the rotating shaft under the push of the spring to lock the circular plate. At this time, the measuring electrode is aligned with the detection cup.

[0038] The electric linear module is activated to move the connecting frame and circular plate downwards, so that the measuring electrode detection end passes through the insertion hole of the upper cover and is immersed in the water sample to be tested in the test cup. The downward movement stops after the detection end is completely submerged.

[0039] S04, Water Sample Parameter Testing: After the measuring electrode has been in full contact with the water sample and has been stable for 1-3 minutes, record the test data.

[0040] The electric linear module is activated, causing the circular plate to move upward to the upper stop point. The fork pulls down the rope, causing the top rod to disengage from the positioning hole. At the same time, the gear at the top of the rotating shaft meshes with the rack. The telescopic control device is activated, driving the rack to extend and retract, rotating the circular plate 90° so that the next measuring electrode is aligned with the detection cup.

[0041] The electric linear module is then restarted to move the circular plate downwards. The push rod is reinserted into the positioning hole to lock the circular plate. After the electrode detection end is immersed in the water sample and stabilizes, the detection data is recorded, thus completing the parameter detection of all measuring electrodes.

[0042] S05. Post-inspection cleaning: After the test is completed, the electric linear module is activated to move the circular plate upward so that the measuring electrode is completely removed from the test cup.

[0043] Open the shut-off valve of the first drain pipe, drain the water sample to be tested from the test cup into the waste liquid collection tank, and then close the shut-off valve.

[0044] If different water samples need to be tested continuously, switch the first three-way valve to inject distilled water into the test water tank through the first bypass pipe, and then rinse the test cup and pipeline through the main supply pipe and the first inlet pipe. The rinsing liquid is discharged into the waste liquid collection tank. Repeat 2-3 times to complete the cleaning.

[0045] S06. Cleaning of measuring electrodes: While some measuring electrodes are used for water sample testing, the remaining measuring electrodes are inserted into a cleaning cup for cleaning.

[0046] The measuring electrode's detection end passes through the cleaning assembly, and a brush mechanically scrapes the outer surface of the electrode.

[0047] Continue moving down to the position relative to the annular water pipe, and introduce distilled water into the annular water pipe. The distilled water is sprayed out through the inner inclined downward through hole to rinse the electrode surface.

[0048] Simultaneously, high-pressure gas is introduced, and the high-pressure gas is ejected through the jet pipe of the rotating ring to form a tangential airflow that drives the rotating ring to rotate. The rotating ring drives the cleaning component to rotate synchronously through the connecting rod, and the jet hole sprays rotating airflow onto the electrode surface.

[0049] During the upward movement of the measuring electrode, the airflow dries the residual distilled water on its surface.

[0050] S07. Calibration of measuring electrodes: Clean the measuring electrodes and the test cup before calibration.

[0051] Inject standard calibration solution into the calibration water tank, switch the valve to connect the main supply pipe to the calibration water tank, and inject the calibration solution into the test cup through the first inlet pipe to form a vortex. Let it stand for 2-5 minutes.

[0052] Align the electrode to be calibrated above the calibration solution detection cup, and move it down so that the detection end is immersed in the calibration solution.

[0053] After the electrode readings stabilize, compare the readings with the standard values ​​of the calibration solution and adjust the electrode coefficients to complete the calibration. Repeat the above process for all measuring electrodes in two batches to complete all calibrations.

[0054] After calibration, move the electrode upwards, drain the calibration solution, and rinse the test cup 2-3 times.

[0055] Furthermore, in step S06, during the process of introducing high-pressure air into the high-pressure air supply assembly, the airflow blowing downwards from the jet nozzles blows away the dirt remaining on the brush, thereby achieving self-cleaning of the cleaning components.

[0056] Compared with the prior art, the beneficial effects of this application are as follows: (1) Relying on the electric linear module and rotary drive assembly, the measuring electrode can be moved up and down automatically, switch positions and be precisely aligned. Multiple parameters such as pH, dissolved oxygen, conductivity and turbidity can be detected sequentially without manual adjustment. The detection and electrode cleaning are carried out in parallel, which greatly shortens the overall operation time. The pretreatment of the detection cup, waste liquid discharge and pipeline flushing are automatically controlled by valves and water pumps, which reduces the intensity of manual operation and reduces the risk of human error. It effectively improves the automation level and detection efficiency of water sample detection.

[0057] (2) A three-stage cleaning mode is adopted, consisting of mechanical scraping, liquid rinsing, and high-pressure air drying. The brush first removes stubborn dirt such as biofilm and particulate matter from the surface of the measuring electrode, then rinses it off with high-pressure distilled water through a ring-shaped water pipe, and finally dries it with high-pressure air. This results in a more thorough cleaning effect and significantly improves the ability to remove stubborn dirt, avoiding residual stains from affecting the detection accuracy. At the same time, the high-pressure air blowing process can drive the brush to rotate, further eliminating cleaning dead corners.

[0058] (3) During the upward movement of the electrode, the high-pressure air can not only dry the moisture on the electrode surface, but also blow away the dirt remaining on the brush at the same time, so as to achieve self-cleaning of the cleaning component and avoid the brush carrying dirt to contaminate the electrode again.

[0059] (4) The method of alternating multiple electrodes, multiple test cups and cleaning devices is adopted to realize the simultaneous detection and cleaning. The automatic switching between detection and cleaning stations eliminates the need to wait for cleaning to be completed before the next round of detection, which greatly shortens the single detection cycle and meets the needs of continuous monitoring of batch water samples.

[0060] (5) The cleaning device and the test cup are both modularly designed. The electrodes and the circular plate are detachably connected, which is convenient for maintenance, replacement and calibration. The annular water pipe and the annular air pipe are arranged close to the inner wall of the cleaning cup, which has a high space utilization rate and does not affect the insertion and removal of electrodes.

[0061] (6) The test cup guides high-pressure distilled water to form a vortex through the spiral groove, which washes the cup wall in all directions. Combined with the anti-splash design of the lid, it thoroughly removes residual water sample and dirt. Waste liquid is collected in a centralized manner through an independent drain pipe to avoid cross-contamination.

[0062] (7) The circular plate is only allowed to rotate when it moves to the upper stop point to avoid impact damage caused by the rotation when the electrode is not removed from the detection cup or when the cup is being cleaned; a positioning and locking structure consisting of a top rod, spring and pull rope is adopted to lock the rotating shaft in the non-electrode switching state to prevent the circular plate from rotating accidentally and to ensure accurate alignment.

[0063] (8) Equipped with an independent calibration water tank and a standard calibration solution with known parameters. Before calibration, the calibration solution is allowed to stand and stabilize. The coefficients are adjusted after the electrodes are in full contact with the calibration solution to ensure accurate calibration of each electrode. Attached Figure Description

[0064] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0065] Figure 1 This is a structural diagram of an electrode-based water quality analyzer with cleaning and calibration functions according to this application. Figure 2 This is a side view of an electrode-based water quality analyzer with cleaning and calibration functions according to this application. Figure 3 This is a top view of an electrode-based water quality analyzer with cleaning and calibration functions according to this application. Figure 4 This is a partial structural diagram of an electrode-based water quality analyzer with cleaning and calibration functions according to this application. Figure 5 This is a cross-sectional view of the disk and connecting frame in an electrode-based water quality analyzer with cleaning and calibration functions according to this application. Figure 6 This is a schematic diagram of the disk structure in an electrode-based water quality analyzer with cleaning and calibration functions according to this application. Figure 7 This is a structural diagram of the detection cup in an electrode-based water quality analyzer with cleaning and calibration functions according to this application. Figure 8 This is a cross-sectional view of the detection cup in an electrode-based water quality analyzer with cleaning and calibration functions according to this application. Figure 9 This is a first cross-sectional view of the cleaning device in an electrode-based water quality analyzer with cleaning and calibration functions according to this application. Figure 10 This is a second cross-sectional view of the cleaning device in an electrode-based water quality analyzer with a cleaning and calibration function according to this application. Figure 11 This is a third sectional view of the cleaning device in an electrode-based water quality analyzer with cleaning and calibration functions according to this application. Figure 12 for Figure 11 Enlarged view of a portion of point A in the middle. Figure 13 This is a piping system diagram of an electrode-based water quality analyzer with cleaning and calibration functions according to this application.

[0066] In the diagram: 1-Measuring electrode, 2-Circular plate, 201-Rotating shaft, 202-Gear, 203-Positioning socket, 3-Telescopic control device, 301-Rack, 4-Connecting frame, 401-Sleeve, 402-Opening, 5-Electric linear module, 501-Sliding part, 6-Workbench, 7-Detection cup, 701-First inlet pipe, 702-First outlet pipe, 703-Spiral groove, 8-Top cover, 9-Cleaning cup, 901-Second outlet pipe, 902-Support ring, 903-Air inlet pipe, 10-Cleaning assembly, 1001-Snap-fit ​​ring, 1002-Brush, 11-Annular water pipe, 1101-Second 12-Fixing ring, 1201-Support ring, 1202-Snap ring, 1203-Mounting ring, 13-Rotating ring, 1301-Ring groove, 1302-Snap groove, 1303-Air jet pipe, 1304-Air jet hole, 1305-Connecting rod, 14-Top rod, 1401-Spring seat, 15-Spring, 16-Guide bracket, 17-Pull rope, 18-Pull rope fixing bracket, 19-Fork rod, 1901-Fork groove, 20-Slide groove, 21-Bracket, 22-Waste liquid collection tank, 23-First three-way valve, 24-First bypass pipe, 25-Second three-way valve, 26-Second bypass pipe, 27-Main liquid supply pipe. Detailed Implementation

[0067] The accompanying drawings provide a more detailed description of an electrode-based water quality analyzer and its testing method with cleaning and calibration functions, but this is not intended to limit the scope of the application.

[0068] Depend on Figures 1 to 13 As shown, an electrode-based water quality analyzer with a cleaning and calibration function includes several measuring electrodes 1. The measuring electrodes 1 are used to detect the pH, dissolved oxygen, conductivity, turbidity, etc. of water samples, and adopt existing products.

[0069] In this embodiment, four types of measuring electrodes 1 are used to detect different parameters of water samples. The measuring electrode 1 is threadedly connected to four threaded holes arranged in a ring around its axis on the circular plate 2 through its own external thread, thereby realizing the detachable connection between the measuring electrode 1 and the circular plate 2. The detection end of the vertically arranged measuring electrode 1 is located below the circular plate 2.

[0070] The circular plate 2 is connected to the sliding part 501 of the vertically arranged electric linear module 5 via the connecting frame 4. The electric linear module 5 drives the circular plate 2 and the measuring electrode 1 to move up and down. A rotary drive assembly is provided on the connecting frame 4. The rotary drive assembly controls the circular plate 2 to rotate, thereby adjusting the orientation of each measuring electrode 1.

[0071] In this embodiment, the circular plate 2 can only rotate when it moves to the upper dead center, to avoid incorrect commands causing the measuring electrode 1 to rotate before it has been removed from the detection cup 7 or cleaning cup 9, which could result in impact damage. In this embodiment, the rotation drive assembly uses a telescopic control device 3 and a rack 301. The telescopic control device 3 can be a cylinder, an electric cylinder, or an electromagnet, which controls the extension and retraction of the rack 301.

[0072] The rack 301 is slidably connected to the slide 20, and the slide 20 and the telescopic control device 3 are both fixedly connected to the worktable 6 through the bracket 21.

[0073] A rotating shaft 201 is coaxially fixed above the circular plate 2, and a gear 202 is fixed at the top of the rotating shaft 201. When the circular plate 2 moves to the upper dead point, the gear 202 meshes with the rack 301, and then the gear 202 is rotated by the extension and retraction of the rack 301, thereby adjusting the angle of the circular plate 2.

[0074] To ensure that the circular plate 2 cannot rotate after the gear 202 disengages from the rack 301, in this embodiment, four positioning holes 203 are recessed on the rotating shaft 201 and distributed radially thereon, with an angle of 90° between two adjacent positioning holes 203.

[0075] The end of the connecting frame 4 is provided with a sleeve 401, which is sleeved onto the outside of the rotating shaft 201. The sleeve 401 is provided with a through hole corresponding to the positioning insertion hole 203, and the through hole is arranged towards the sliding part 501. The connecting frame 4 adopts a double-layer plate, and a top rod 14 is provided between the double-layer plate. A spring seat 1401 is fixed on the top rod 14, and a spring 15 is sleeved on the top rod 14.

[0076] Guide brackets 16 and rope fixing brackets 18 are fixed at intervals on the connecting frame 4. The horizontally arranged push rod 14 is slidably connected to the sliding hole on the guide bracket 16. The two ends of the spring 15 abut against the spring seat 1401 and the guide bracket 16, respectively. In the free state, under the push of the spring 15, the end of the push rod 14 passes through the through hole on the sleeve 401 and is inserted into the positioning insertion hole 203, thereby locking the rotating shaft 201 and preventing it from rotating.

[0077] A pull rope 17 is fixed between the end of the push rod 14 away from the sleeve 401 and the pull rope fixing bracket 18. When the end of the push rod 14 is inserted into the positioning hole 203, the pull rope 17 is in a taut state.

[0078] Fork rods 19 are spaced apart directly above the connecting frame 4, and are fixedly connected to the bracket 21. The connecting frame 4 has openings 402 corresponding to the fork rods 19, and fork grooves 1901 are recessed at the bottom of the fork rods 19, corresponding to the pull rope 17. When the circular plate 2 moves to its upper stop point, the fork groove 1901 presses down on the pull rope 17, thereby pulling the top rod 14 backward, disengaging it from the positioning hole 203, and releasing the lock on the rotating shaft 201.

[0079] A workbench 6 is provided below the circular plate 2, and the electric linear module 5 is fixedly connected to the workbench 6 through a fixing frame.

[0080] The workbench 6 is provided with several cleaning devices and several test cups 7. In this embodiment, the workbench 6 is provided with two cleaning devices and two test cups 7. The cleaning devices and test cups 7 are arranged at intervals. The upper end of the test cups 7 is open. The test cups 7 and the cleaning devices are all arranged in a ring array around the axis of the circular plate 2.

[0081] The bottom of the test cup 7 is provided with a first drain pipe 702, and a shut-off valve is connected in series on the first drain pipe 702.

[0082] A waste liquid collection tank 22 is provided below the workbench 6, and the end of the first drain pipe 702 is connected to the waste liquid collection tank 22.

[0083] In this embodiment, the inner wall of the detection cup 7 is recessed with a spiral groove 703, and a first liquid inlet pipe 701 is connected to the outside of the detection cup 7. The first liquid inlet pipe 701 is connected to the top port of the spiral groove 703. A top cover 8 is provided at the opening of the detection cup 7. The center of the top cover 8 is provided with an insertion hole, and the inner diameter of the insertion hole is larger than the outer diameter of the detection end of the measuring electrode 1.

[0084] To improve the water level inside the detection cup 7 during cleaning, in this embodiment, the inner diameter of the first drain pipe 702 is smaller than the inner diameter of the first inlet pipe 701. Under the action of the upper cover 8, the distilled water forming a vortex will not splash outside the detection cup 7.

[0085] The cleaning device shown includes a cleaning cup 9 with an open top. A second drain pipe 901 is connected through the bottom of the cleaning cup 9. A shut-off valve is connected in series on the second drain pipe 901. The end of the second drain pipe 901 is connected through the waste liquid collection tank 22.

[0086] The cleaning cup 9 is coaxially equipped with an annular water pipe 11 and a pneumatic assembly inside. The annular water pipe 11 has an inwardly oriented through hole for communicating with the interior of the cleaning cup 9. The through hole is inclined downwards inwards. The cleaning cup 9 is equipped with a second liquid inlet pipe 1101 that communicates with the annular water pipe 11 on the outside.

[0087] The annular water pipe 11 and the pneumatic assembly are closely attached to the inner wall of the cleaning cup 9, with the annular water pipe 11 positioned below the pneumatic assembly. The cleaning cup 9 has an air inlet pipe 903 that is connected to the pneumatic assembly on its exterior.

[0088] To further optimize the cleaning effect, especially to optimize the cleaning of stubborn dirt such as biofilm and particulate matter attached to the surface of the measuring electrode 1, in this embodiment, a cleaning component 10 is provided inside the cleaning cup 9, and the cleaning component 10 is disposed between the annular water pipe 11 and the pneumatic assembly.

[0089] The cleaning component 10 includes a snap-fit ​​ring 1001 and brushes 1002. The outer wall of the snap-fit ​​ring 1001 abuts against the inner wall of the cleaning cup 9, and several brushes 1002 are fixedly disposed on the inner side of the snap-fit ​​ring 1001. A support ring 902 protrudes from the inner wall of the cleaning cup 9, and the bottom surface of the snap-fit ​​ring 1001 abuts against the top surface of the support ring 902.

[0090] When the measuring electrode 1 is inserted into the cleaning cup 9, the brush 1002 mechanically scrapes it from all directions as it passes through the cleaning component 10, removing and separating stubborn dirt from its surface. After passing through the cleaning component 10, it is cleaned a second time by high-pressure distilled water sprayed through the annular water pipe 11, washing away the dirt that was brushed off.

[0091] After rinsing, the measuring electrode 1 moves upward, passes through the cleaning assembly 10, and is dried by high-pressure air ejected from the pneumatic assembly. As the measuring electrode 1 moves upward, residual dirt on the brush 1001 may re-adhere, but this dirt has weak adhesion to the measuring electrode 1 and is easily blown away by the high-pressure air, thus preventing secondary contamination of the measuring electrode 1.

[0092] At the same time, the high-pressure air can also blow away the dirt attached to the brush 1002, thereby cleaning the cleaning component 10.

[0093] If the cleaning assembly 10 does not rotate during the downward movement of the measuring electrode 1 through it, the brush 1002 will only clean the outer surface of the measuring electrode 1 along its axial direction, forming a vertical cleaning channel on the outer surface of the measuring electrode 1, which will result in some cleaning dead zones. If the cleaning assembly 10 rotates synchronously during the downward movement of the measuring electrode 1, these cleaning dead zones can be effectively eliminated.

[0094] To achieve the above objectives, in this embodiment, the pneumatic assembly includes two fixed rings 12 arranged at an upper and lower interval and opposite to each other, and a rotating ring 13. Both the fixed rings 12 and the rotating ring 13 are arranged coaxially with the cleaning cup 9.

[0095] The fixing ring 12 includes a horizontally arranged support ring 1201. The inner and outer ends of the support ring 1201 are respectively provided with a retaining ring 1202 and a mounting ring 1203. The mounting ring 1203 abuts against the inner wall of the cleaning cup 9, and the two are fixedly connected by bolts or adhesive. The retaining ring 1202 and the mounting ring 1203 are both located on the opposite side of the two fixing rings 12. The support rings 1201 of the two fixing rings are respectively located on the upper and lower sides of the through hole between the air inlet pipe 903 and the cleaning cup 9.

[0096] The rotating ring 13 includes an annular groove 1301 and several jet pipes 1303. The inner wall of the annular groove 1301 has recessed slots 1302 on both the upper and lower sides, which engage with retaining rings 1202. Several jet pipes 1303 are fixed in the middle of the annular groove 1301, and the jet pipes 1303, the annular groove 1301, and the inner cavity formed by the fixed ring 12 are connected. Jet jets from the outlets of the jet pipes 1303 form a tangential airflow, which drives the rotating ring 13 to rotate.

[0097] The bottom of the annular groove 1301 is provided with an air jet hole 1304 arranged with its inner side tilted downward. The air jet hole 1304 connects the inner cavity formed by the annular groove 1301 and the fixed ring 12 with the inner cavity of the cleaning cup 9.

[0098] The annular groove 1301 is fixedly connected to the snap ring 1001 by a number of connecting rods 1305.

[0099] The workbench 6 is equipped with a distilled water tank, a test water tank, a calibration water tank, and a high-pressure air supply assembly. The high-pressure air supply assembly includes an air compressor, a high-pressure air cylinder, a pressure regulating valve, and corresponding connecting air pipes.

[0100] The distilled water tank is filled with distilled water for cleaning, the test water tank is filled with the water sample to be tested, and the calibration water tank contains calibration solution. The pH, dissolved oxygen, conductivity, and turbidity of the calibration solution are fixed and known.

[0101] Both the test water tank and the calibration water tank are connected to the main supply pipe 27 via water pipes equipped with water pumps and shut-off valves. The outlet pipe of the distilled water tank is connected in series with a water pump, a first three-way valve 23, and a second three-way valve 25. The last outlet of the first three-way valve 23 is connected to the test water tank via a first bypass pipe 24. The last outlet of the second three-way valve 25 is connected to the second inlet pipe 1101 via a second bypass pipe 26. The end of the main supply pipe 27 is connected to the first inlet pipe 701.

[0102] By changing the opening degree of the first three-way valve 23, distilled water can be injected into the detection water tank through the first bypass pipe 24 to clean the detection water tank.

[0103] The connection port between the main liquid supply pipe 27 and the calibration water tank is closest to the first liquid inlet pipe 701, while the connection port between the main liquid supply pipe 27 and the distilled water tank is furthest from the first liquid inlet pipe 701, which facilitates the cleaning of the main liquid supply pipe 27 with distilled water.

[0104] The water sample testing method includes the following steps: S01, Liquid Preparation: Fill the test water tank with a sufficient amount of water sample to be tested, fill the distilled water tank with distilled water, and ensure that the waste liquid collection tank 22 is empty. S02, Pre-treatment of the test cup: The water sample to be tested is injected into the test cup 7 through the first inlet pipe 701. The spiral groove guides the water sample to form a vortex to clean the test cup 7. At the same time, the shut-off valve on the first drain pipe 702 is opened so that the water sample to be tested flows into the waste liquid collection tank 22 after cleaning the test cup 7. After cleaning, close the shut-off valve on the first drain pipe 702, raise the liquid level inside the detection cup 7 to the detection height, and ensure that the measuring end of the measuring electrode 1 is completely immersed in the water sample to be tested after it is lowered. S03, Electrode Alignment and Insertion: The circular plate 2 is initially positioned near the bottom dead center. The push rod 14, pushed by the spring 15, passes through the through hole of the sleeve 401 and is inserted into the positioning insertion hole 203 of the rotating shaft 201, thereby locking the circular plate 2. At this time, the measuring electrode 1 is positioned directly opposite the detection cup 7.

[0105] Start the electric linear module 5, which drives the sliding part 501, the connecting frame 4 and the circular plate 2 to move down synchronously, so that the detection end of the measuring electrode 1 passes through the insertion hole of the upper cover 8 and is slowly immersed into the water sample to be tested in the detection cup 7. The downward movement stops after the detection end is completely submerged. S04, Water Sample Parameter Testing: After the measuring electrode 1 is in full contact with the water sample, and the sample is kept stable for 1-3 minutes depending on the parameter type, the electrode detection data is recorded to complete the measurement of the first batch of parameters. At this time, two measuring electrodes 1 are inserted into two detection cups 7 to detect the first two parameters.

[0106] When the electric linear module 5 is started, the circular plate 2 is moved upward until the upper stop position is reached. At this time, the fork groove 1901 of the fork rod 19 presses down the pull rope 17, pulls the top rod 14 to compress the spring 15 and disengage from the positioning socket 203, releasing the lock of the rotating shaft 201. At the same time, the gear 202 at the top of the rotating shaft 201 meshes with the rack 301.

[0107] Start the telescopic control device 3 to drive the rack 301 to extend and retract, and drive the rotating shaft 201 and the circular plate 2 to rotate 90° through the gear 202, so that the next measuring electrode 1 is directly opposite the current detection cup 7; Then, the electric linear module 5 is activated to move the circular plate 2 downwards. The fork 19 disengages from the pull rope 17, and the top rod 14 re-inserts into the adjacent positioning hole 203 under the action of the spring 15, locking the circular plate 2 and resetting the telescopic control device 3. The plate continues to move downwards until the electrode detection end is immersed in the water sample. After stabilization, the detection data is recorded, completing the parameter detection of the two other measuring electrodes 1. S05. Post-inspection cleaning: After the test is completed, the electric linear module 5 is started to move the circular plate 2 upward, so that the measuring electrode 1 is completely separated from the measuring cup 7 and moved to a safe position above the upper cover 8.

[0108] Open the shut-off valve on the first drain pipe 702 and drain the water sample to be tested from the test cup 7 into the waste liquid collection tank 22. After the discharge is completed, close the shut-off valve.

[0109] If different water samples need to be tested continuously, the first three-way valve 23 is used to switch the distilled water in the distilled water tank to be injected into the test water tank through the first bypass pipe 24. Then, the test cup 7 and pipeline are rinsed through the main liquid supply pipe 27 and the first liquid inlet pipe 701. The rinsing liquid is discharged into the waste liquid collection tank 22 through the first drain pipe 702. The cleaning is completed after repeating 2-3 times.

[0110] S06. Cleaning of measuring electrodes: While two of the measuring electrodes 1 are inserted into the detection cup 7 to detect water sample parameters, the other two measuring electrodes 1 are inserted into the cleaning cup 9 to clean the measuring electrodes 1.

[0111] The measuring electrode 1 passes through the cleaning component 10 inside the cleaning cup 9, and the brush 1002 performs all-round mechanical scraping on the outer surface of the electrode to separate stubborn dirt. When moving down to the relative position of the annular water pipe 11, the water pump of the distilled water tank outlet pipe, the second three-way valve 25 and the shut-off valve on the second liquid inlet pipe 1101 are opened. Distilled water is sprayed out through the inner inclined downward through hole on the annular water pipe 11, forming a high-pressure water flow to rinse the electrode surface and wash away the scraped dirt. During the rinsing process, maintain water flow for 30-60 seconds, and the rinsing liquid is discharged into the waste liquid collection tank 22 through the second drain pipe 901.

[0112] When the measuring electrode 1 is inserted into the cleaning cup 9, the shut-off valve on the air inlet pipe 903 is opened, and the high-pressure air supply assembly introduces high-pressure air into the pneumatic assembly; the high-pressure air is ejected through the jet pipe 1303 of the rotating ring 13 to form a tangential airflow, which drives the rotating ring 13 to rotate, and at the same time, the rotating airflow is ejected onto the electrode surface through the downward inclined jet hole 1304 on the inner side of the bottom of the ring groove 1301.

[0113] During the downward movement of the measuring electrode 1, the rotating ring 13 drives the cleaning component 10 to rotate synchronously through the connecting rod 1305. The rotating brush 1002 cleans the outer surface of the measuring electrode 1, eliminating cleaning dead corners. At the same time, the airflow blown downward by the jet hole 1304 can blow away the dirt remaining on the brush 1002 by the high-pressure air, realizing the self-cleaning of the cleaning component. During the cleaning and upward movement of measuring electrode 1, the airflow ejected from jet pipe 1303 and jet hole 1304 can dry the residual distilled water on its surface; S07. Calibration of measuring electrodes: Before calibration, the cleaning process of measuring electrode 1 and detection cup 7 must be completed to avoid residual dirt affecting calibration accuracy.

[0114] Inject the standard calibration solution with preset parameters into the calibration water tank, switch the valve to establish a connection between the main supply pipe 27 and the calibration water tank, and close the connection between the main supply pipe 27 and the test water tank and the distilled water tank.

[0115] The calibration solution is injected into the test cup 7 through the first inlet pipe 701, and a vortex is formed by the spiral groove 703 to ensure that the calibration solution is mixed evenly. Allow the calibration solution to stand in the test cup 7 for 2-5 minutes to ensure that the temperature and concentration are uniform and stable, and to avoid parameter fluctuations caused by residual vortex.

[0116] The electric linear module 5 and the rotary drive assembly align the measuring electrode 1 to be calibrated above the detection cup 7 containing the calibration liquid, and then move the electrode down so that the detection end is immersed in the calibration liquid to maintain a stable contact state.

[0117] After the electrode detection values ​​stabilize, compare the displayed value of the detection instrument with the known standard value of the calibration solution, and adjust the electrode coefficient through the instrument's built-in calibration program to complete the calibration of a single parameter electrode. In two batches, align the four measuring electrodes 1 to the calibration solution detection cup 7, repeat the insertion and calibration process, and complete the calibration of all electrodes.

[0118] After calibration, activate the electric linear module 5 to move the electrode upwards, detaching it from the test cup 7 to a safe position. Open the shut-off valve of the first drain pipe 702 to drain the calibration solution in the test cup 7 into the waste liquid collection tank 22, then close the shut-off valve. By switching the liquid supply system, inject distilled water into the test cup 7 to rinse it 2-3 times, draining the rinsing solution into the waste liquid collection tank 22 to ensure no calibration solution residue remains.

[0119] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. An electrode-based water quality analyzer with cleaning and calibration functions, characterized in that: It includes several measuring electrodes (1), a circular plate (2), an electric linear module (5), a rotary drive assembly, a worktable (6), several detection cups (7), several cleaning devices, and a waste liquid collection tank (22). The measuring electrode (1) is detachably connected to the circular plate (2), the measuring electrode (1) is arranged vertically and the detection end is located below the circular plate (2); The electric linear module (5) drives the circular plate (2) to move up and down, and the rotary drive assembly is used to control the rotation of the circular plate (2) to adjust the orientation of each measuring electrode (1); The electric linear module (5) is fixedly connected to the workbench (6) through a fixed frame. The detection cup (7) and the cleaning device are arranged on the workbench (6) at intervals and are all arranged in a ring array around the axis of the circular plate (2). The bottom of the detection cup (7) is provided with a first drain pipe (702). The first drain pipe (702) is connected in series with a shut-off valve and its end is connected to the waste liquid collection box (22). The workbench (6) is equipped with a distilled water tank, a test water tank, a calibration water tank and a high-pressure gas supply assembly on its exterior. The test tank and calibration tank are connected to the main supply pipe (27) via a water pipe with a water pump and a shut-off valve; The water outlet pipe of the distilled water tank is connected in series with a water pump, a first three-way valve (23) and a second three-way valve (25). The first three-way valve (23) is connected to the test water tank through the first bypass pipe (24), and the second three-way valve (25) is connected to the cleaning device through the second bypass pipe (26). The end of the main liquid supply pipe (27) is connected to the test cup (7).

2. The electrode-based water quality analyzer with cleaning and calibration function according to claim 1, characterized in that: The rotary drive assembly includes a telescopic control device (3) and a rack (301), wherein the telescopic control device (3) controls the extension and retraction of the rack (301); A gear (202) is fixed at the top of the rotating shaft (201). When the circular plate (2) moves up to the top dead center, the gear (202) meshes with the rack (301).

3. The electrode-based water quality analyzer with cleaning and calibration function according to claim 2, characterized in that: A rotating shaft (201) is coaxially fixed above the circular plate (2), and positioning holes (203) are recessed on the rotating shaft (201) and distributed along its radial direction; The circular plate (2) is connected to the sliding part (501) of the electric linear module (5) through the connecting frame (4). The end of the connecting frame (4) is provided with a sleeve (401) sleeved outside the rotating shaft (201). The sleeve (401) is provided with a through hole corresponding to the positioning insertion hole (203). The connecting frame (4) is fixed with a guide bracket (16) and a rope fixing bracket (18). The top rod (14) is arranged horizontally and slidably connected to the sliding hole on the guide bracket (16). A spring seat (1401) is fixed on the top rod (14). The spring (15) is sleeved on the top rod (14) and its two ends abut against the spring seat (1401) and the guide bracket (16) respectively. In the free state, the end of the top rod (14) passes through the through hole and is inserted into the positioning insertion hole (203). The pull rope (17) is fixed between the end of the top rod (14) away from the sleeve (401) and the pull rope fixing bracket (18). The fork (19) is positioned directly above the connecting frame (4). The connecting frame (4) has an opening (402) corresponding to the fork (19). The bottom of the fork (19) has a fork groove (1901) corresponding to the pull rope (17). When the circular plate (2) moves up to the upper stop point, the fork groove (1901) presses down on the pull rope (17) to make the top rod (14) disengage from the positioning hole (203).

4. The electrode-based water quality analyzer with cleaning and calibration function according to claim 1, characterized in that: The inner wall of the test cup (7) is recessed with a spiral groove (703), and a first liquid inlet pipe (701) is connected to the outside. The first liquid inlet pipe (701) is connected to the top port of the spiral groove (703). The opening of the test cup (7) is covered with a top cover (8), and the center of the top cover (8) has an insertion hole. The inner diameter of the insertion hole is larger than the outer diameter of the test end of the measuring electrode (1).

5. The electrode-based water quality analyzer with cleaning and calibration function according to claim 1, characterized in that: The cleaning device includes a cleaning cup (9), a ring water pipe (11), and a pneumatic assembly; The upper end of the cleaning cup (9) is open, and the bottom is connected to a second drain pipe (901). The second drain pipe (901) is connected in series with a shut-off valve and its end is connected to the waste liquid collection box (22). The annular water pipe (11) is coaxially disposed inside the cleaning cup (9), and has a through hole that is inclined downwards towards the inside. The cleaning cup (9) is provided with a second liquid inlet pipe (1101) that communicates with the annular water pipe (11). The pneumatic assembly is connected to the air inlet pipe (903) outside the cleaning cup (9), and the annular water pipe (11) is located below the pneumatic assembly and both are in close contact with the inner wall of the cleaning cup (9).

6. The electrode-based water quality analyzer with cleaning and calibration function according to claim 5, characterized in that: The cleaning cup (9) is equipped with a cleaning component (10) located between the annular water pipe (11) and the pneumatic assembly, including a snap ring (1001) and several brushes (1002). The outer wall of the snap ring (1001) abuts against the inner wall of the cleaning cup (9), and the brush (1002) is fixed to the inner side of the snap ring (1001); The inner wall of the cleaning cup (9) is provided with a support ring (902), and the bottom surface of the snap ring (1001) abuts against the top surface of the support ring (902).

7. The electrode-based water quality analyzer with cleaning and calibration function according to claim 6, characterized in that: The pneumatic assembly includes two fixed rings (12) arranged at an upper and lower interval and a rotating ring (13), both of which are coaxial with the cleaning cup (9). The fixing ring (12) includes a support ring (1201). The inner and outer ends of the support ring (1201) are respectively provided with a retaining ring (1202) and a mounting ring (1203). The mounting ring (1203) is fixedly connected to the inner wall of the cleaning cup (9). The support rings (1201) of the two fixing rings (12) are located on the upper and lower sides of the through hole between the air inlet pipe (903) and the cleaning cup (9). The inner wall of the rotating ring (13) is recessed with slots (1302) on both the upper and lower sides, and the slots (1302) are engaged with the retaining ring (1202); a number of jet pipes (1303) are fixed in the middle of the rotating ring (13), and the jet pipes (1303) are connected to the inner cavity formed by the rotating ring (13) and the fixed ring (12), and the jet pipes (1303) spray jets to form a tangential airflow; The bottom of the rotating ring (13) is provided with an air jet hole (1304) arranged with its inner side tilted downwards. The air jet hole (1304) connects the above-mentioned inner cavity with the inner cavity of the cleaning cup (9). The rotating ring (13) is fixedly connected to the snap ring (1001) by several connecting rods (1305).

8. The electrode-based water quality analyzer with cleaning and calibration function according to claim 1, characterized in that: The connection port between the main liquid supply pipe (27) and the calibration water tank is closest to the first liquid inlet pipe (701), and the connection port between the main liquid supply pipe (27) and the distilled water tank is furthest from the first liquid inlet pipe (701); the high-pressure gas supply assembly includes an air compressor, a high-pressure gas cylinder, a pressure regulating valve and corresponding connecting gas pipes.

9. A method for detecting water samples, characterized in that, Includes the following steps: S01, Liquid Preparation: Pour sufficient water sample into the test tank, fill the distilled water tank with distilled water, and ensure that the waste liquid collection tank (22) is empty; S02, Pre-treatment of the detection cup: The water sample to be tested is injected into the test cup (7) through the first inlet pipe (701). The spiral groove (703) on the inner wall of the test cup (7) guides the water sample to form a vortex to clean the test cup (7). At the same time, the shut-off valve on the first drain pipe (702) is opened so that the cleaned water sample to be tested flows into the waste liquid collection tank (22). After cleaning, close the shut-off valve on the first drain pipe (702), and inject the water sample to be tested into the test cup (7) to the test height to ensure that the test end can be completely immersed in the water sample to be tested after the measuring electrode (1) is moved down; S03, Electrode Alignment and Insertion: In the initial state, the circular plate (2) is near the bottom dead center. The push rod (14) is pushed by the spring (15) and inserted into the positioning hole (203) of the rotating shaft (201) to lock the circular plate (2). At this time, the measuring electrode (1) is facing the detection cup (7). Start the electric linear module (5) to drive the connecting frame (4) and the circular plate (2) to move down, so that the detection end of the measuring electrode (1) passes through the insertion hole of the upper cover (8) and is immersed in the water sample to be tested in the detection cup (7). Stop moving down after the detection end is completely submerged. S04, Water Sample Parameter Testing: After the measuring electrode (1) has been in full contact with the water sample and stabilized for 1-3 minutes, the detection data is recorded; Start the electric linear module (5) to move the circular plate (2) up to the upper stop point. The fork (19) presses down the pull rope (17) to make the top rod (14) disengage from the positioning socket (203). At the same time, the gear (202) at the top of the rotating shaft (201) meshes with the rack (301). Start the telescopic control device (3) to drive the rack (301) to extend and retract, and rotate the circular plate (2) 90° so that the next measuring electrode (1) is aligned with the detection cup (7). Restart the electric linear module (5) to drive the circular plate (2) to move down, and re-insert the top rod (14) into the positioning hole (203) to lock the circular plate (2). After the electrode detection end is immersed in the water sample and stabilized, record the detection data to complete the parameter detection of all measuring electrodes (1). S05. Post-inspection cleaning: After the test is completed, start the electric linear module (5) to move the circular plate (2) upward so that the measuring electrode (1) is completely separated from the test cup (7); Open the shut-off valve of the first drain pipe (702), drain the water sample to be tested from the test cup (7) into the waste liquid collection box (22), and then close the shut-off valve; If different water samples need to be tested continuously, switch the first three-way valve (23) to inject distilled water into the test water tank through the first bypass pipe (24), and then rinse the test cup (7) and pipeline through the main liquid supply pipe (27) and the first liquid inlet pipe (701). The rinsing liquid is discharged into the waste liquid collection tank (22). Repeat 2-3 times to complete the cleaning. S06. Cleaning of measuring electrodes: While some measuring electrodes (1) are used for water sample testing, the remaining measuring electrodes (1) are inserted into the cleaning cup (9) for cleaning. The measuring electrode (1) passes through the cleaning assembly (10) and the brush (1002) mechanically scrapes the outer surface of the electrode. Continue moving down to the relative position of the annular water pipe (11), and introduce distilled water into the annular water pipe (11). The distilled water is sprayed out through the inner inclined downward through hole to rinse the electrode surface. At the same time, high-pressure gas is introduced, and the high-pressure gas is ejected through the jet pipe (1303) of the rotating ring (13) to form a tangential airflow that drives the rotating ring (13) to rotate. The rotating ring (13) drives the cleaning component (10) to rotate synchronously through the connecting rod (1305), and the jet hole (1304) sprays rotating airflow onto the electrode surface. During the upward movement of the measuring electrode (1), the airflow dries the residual distilled water on its surface; S07. Calibration of measuring electrodes: Before calibration, clean the measuring electrode (1) and the detection cup (7); Inject standard calibration solution into the calibration water tank, switch the valve to connect the main supply pipe (27) to the calibration water tank, and inject the calibration solution into the test cup (7) through the first inlet pipe (701) to form a vortex. Let it stand for 2-5 minutes. Align the measuring electrode (1) to be calibrated above the calibration liquid detection cup (7), and move it down so that the detection end is immersed in the calibration liquid; After the electrode detection values ​​stabilize, compare the detection values ​​with the standard values ​​of the calibration solution and adjust the electrode coefficients to complete the calibration; repeat the above process for all measuring electrodes in two batches (1) to complete all calibrations; After calibration, move the electrode upward, drain the calibration solution and rinse the test cup (7) 2-3 times.

10. The water sample detection method according to claim 9, characterized in that: In step S06, during the process of introducing high-pressure air into the high-pressure air supply assembly, the airflow blowing downwards from the jet hole (1304) blows away the dirt remaining on the brush (1002), thereby achieving self-cleaning of the cleaning component (10).

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