COD (Chemical Oxygen Demand) water quality on-line monitoring device

Abstract

The utility model discloses a COD (Chemical Oxygen Demand) water quality on-line monitoring device, which relates to the technical field of water quality monitoring and comprises a box body, a door plate is rotatably arranged on the side surface of the box body, a control component is arranged on the door plate, a working cavity and a medicine placing cavity are arranged in the box body, and a sampling unit, a medicine adding unit and a digestion tank are arranged in the working cavity. The sampling unit and the dosing unit are communicated with the digestion tank, a cleaning unit, a heating unit and a detection probe are arranged in the digestion tank, a control valve is arranged on the lower surface of the digestion tank, and a blow-off pipe is mounted on the control valve. The device has the beneficial effects that by cleaning a digestion tank, a detection probe, a first metering assembly, a first continuous discharging valve, a second metering assembly and a second continuous discharging valve, the cleaning efficiency and the service life of the monitoring device are effectively improved, the cleaning frequency of workers is reduced, and the situation that a water sample and a reagent are mixed to influence a detection result is avoided; the accuracy of water quality sample detection results of the monitoring device is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of water quality monitoring, in particular to a COD water quality online monitoring device. Background Art

[0002] Chemical oxygen demand (COD) is a chemical method that measures the amount of reducing substances that need to be oxidized in water samples. It refers to the oxygen equivalent of organic matter in wastewater, effluent from wastewater treatment plants and contaminated water that can be oxidized by strong oxidants. When monitoring COD water quality, it is necessary to sample the water to be monitored, place the sample in a digestion tank for heating and digestion, and then add reagents to the digested samples to allow the reagents and samples to react. The sample detection is completed based on the change in color of the sample.

[0003] After searching, the Chinese patent publication number CN213091638U discloses a COD water quality online automatic monitoring device, which is mainly connected to the monitor through a top cover with threads, so as to facilitate the cleaning of the inside of the monitor, thereby ensuring the accuracy after long-term use.

[0004] By comparing with the existing technologies in related fields, it can be seen that scale will precipitate after the sample is heated. The accumulation of scale will affect the digestion tank and the probe, and affect the test results. The existing COD water quality monitoring device needs to be cleaned regularly. This method increases the workload of the staff and affects the detection speed of the sample. It is very easy to cause deviations in the test results of the water quality samples before cleaning the scale. Utility Model Content

[0005] The purpose of the utility model is to provide a COD water quality online monitoring device in order to solve the above problems.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] A COD water quality online monitoring device comprises a box body, a door panel is rotatably installed on the side of the box body, a control component is installed on the door panel, a working chamber and a medicine dispensing chamber are arranged in the box body, a sampling unit, a medicine adding unit and a digestion tank are arranged in the working chamber, the sampling unit and the medicine adding unit are connected to the digestion tank, a cleaning unit, a heating unit and a detection probe are arranged in the digestion tank, a control valve is arranged on the lower surface of the digestion tank, a sewage pipe is installed on the control valve, the control component is electrically connected to an external power supply, the control component is electrically connected to the detection probe and the control valve, the control component, the detection probe and the control valve work using existing technology, and the detection probe and the control valve are electrically connected. The reagent used for the test is placed in the drug-discharging chamber, the sampling unit transports the water sample to the digestion tank, the heating unit heats the water sample in the digestion tank, the dosing unit adds the reagent in the drug-discharging chamber to the digestion tank, so that the water sample and the reagent react with each other, the detection probe detects the treated water sample in the digestion tank, and thus completes the COD test of the water sample. After the test is completed, the sample is exported through the control valve and the drain pipe, and the digestion tank and the detection probe are cleaned by the cleaning unit to avoid scale accumulation and ensure the accuracy of the test results;

[0008] The cleaning unit includes a driving assembly, a catheter, a water guide valve and an installation box. The installation box is installed on the lower surface of the digestion tank, the driving assembly and the water guide valve are installed in the installation box, the catheter is rotatably installed in the digestion tank and the installation box, the catheter is rotatably connected to the water guide valve, the catheter is transmission-connected to the driving assembly, a water outlet and a stirring rod are arranged on the part of the catheter located in the digestion tank, the water outlet is inclined, a storage cavity is arranged on the end of the stirring rod, a buffer assembly is installed in the storage cavity, a cleaning roller is installed on the buffer assembly, the water guide valve is connected to an external pure water delivery device, the water guide valve and the control assembly are electrically connected, the water guide valve, the driving assembly and the buffer assembly work using existing technology, during detection, the driving assembly drives the stirring rod to rotate through the catheter, and the stirring rod The sample and reagent are stirred and mixed so that they can react quickly and effectively improve the speed of detection. After the detection is completed, the external pure water delivery device delivers pure water to the digestion tank through the water guide valve, the conduit and the water outlet. At the same time, the conduit is driven to rotate by the driving component, and the digestion tank and the detection probe are rinsed with the water flow sprayed from the water outlet, so as to avoid the accumulation of scale in the digestion tank and on the detection probe. At the same time, the conduit drives the cleaning roller to rotate through the stirring rod and the buffer component, and the detection probe is cleaned by the cleaning roller to ensure the cleanliness of the surface of the detection probe, avoid the accumulation of scale and affect the accuracy of the detection result, improve the use time and efficiency of the detection, and reduce the number of cleaning times and the workload of the staff.

[0009] Furthermore, the driving assembly includes a motor and a driven bevel gear. The motor is installed on the side of the mounting box. The output shaft of the motor is rotatably connected to the mounting box. The driving bevel gear is installed on the part of the output shaft of the motor located in the mounting box. The driven bevel gear is installed on the part of the catheter located in the mounting box. The driven bevel gear is meshed and connected to the driving bevel gear. The motor and the control assembly are electrically connected. The motor works using existing technology. The motor drives the catheter to rotate forward and reverse through the driving bevel gear and the driven bevel gear.

[0010] Furthermore, the buffer assembly includes a spring and a mounting rod, the spring is installed in the storage cavity, the mounting rod is slidably installed on the stirring rod, the part of the mounting rod located in the storage cavity is connected to the spring, and the other end of the mounting rod is connected to the cleaning roller. Through the spring and the mounting rod, the cleaning roller can buffer the contact with the detection probe, so that the cleaning roller can effectively clean the detection probe and avoid damage caused by hard contact of the cleaning roller to the detection probe.

[0011] Furthermore, the interior of the catheter is a cone with one end narrow and the other end wide, and a one-way valve is installed in the water outlet to prevent the sample in the digestion tank from flowing back into the water outlet. The conical design with one end narrow and the other end wide inside the catheter allows the water flow to be evenly dispersed and transported in the catheter.

[0012] Furthermore, the sampling unit includes a first peristaltic pump, a first metering component and a first continuous valve, which are all installed in a working chamber, the discharge end of the first continuous valve is connected to the first metering component and the sewage pipe, the first metering component is connected to the first peristaltic pump, the first peristaltic pump is connected to the digestion tank, the first peristaltic pump, the first metering component and the first continuous valve are electrically connected to the control component, the first peristaltic pump, the first metering component and the first continuous valve work using existing technology, the first peristaltic pump samples water quality through the first metering component and the first continuous valve, and transports the sample to the digestion tank.

[0013] Furthermore, the dosing unit includes a second peristaltic pump, a second metering component and a second chain valve, which are all installed in the working chamber, the feed end of the second chain valve is connected to the drug release chamber, the discharge end of the second chain valve is connected to the second metering component and the drain pipe, the second metering component is connected to the second peristaltic pump, the second peristaltic pump is connected to the digestion tank, the second peristaltic pump, the second metering component and the second chain valve are electrically connected to the control component, the second peristaltic pump, the second metering component and the second chain valve work using existing technology, and the second peristaltic pump transports the reagent in the drug release chamber to the digestion tank through the second metering component and the second chain valve.

[0014] Furthermore, the heating unit includes a heating wire and a temperature sensor, both of which are installed in the digestion tank, the heating wire is located between the stirring rod and the catheter, the heating wire and the temperature sensor are electrically connected to the control component, the heating wire and the temperature sensor work using existing technology, the sample in the digestion tank is heated by the heating wire, and the temperature in the digestion tank is detected by the temperature sensor, thereby facilitating the control of the temperature of the heating wire.

[0015] Furthermore, baffles are installed on both sides of the connection between the heating wire and the digestion tank to protect the heating wire.

[0016] The beneficial effects compared with the prior art are as follows:

[0017] 1. Pure water is delivered to the digestion tank through the water guide valve, the conduit and the water outlet. The motor, the active bevel gear and the driven bevel gear drive the conduit to rotate, so as to flush the different positions of the digestion tank and the detection probe to ensure the flushing effect. The cleaning roller is driven by the conduit and the stirring rod to clean the different positions of the detection probe, which effectively avoids the accumulation of scale generated during the heating and digestion process of the water quality sample in the digestion tank and on the detection probe. The first metering component and the first row valve are flushed by the reverse rotation of the first peristaltic pump, and the second metering component and the second row valve are flushed by the reverse rotation of the second peristaltic pump, which effectively reduces the residual reagents and avoids the mixing of the residual reagents to affect the detection results. By cleaning the digestion tank, the detection probe, the first metering component, the first row valve, the second metering component and the second row valve, the cleaning efficiency and service life of the monitoring device are effectively improved, the number of cleaning times by the staff is reduced, the mixing of water quality samples and reagents to affect the detection results is avoided, and the accuracy of the results of the monitoring device detecting water quality samples is ensured.

[0018] 2. The motor, active bevel gear and driven bevel gear drive the catheter and the stirring rod to rotate, and the stirring rod stirs the water and reagents in the digestion tank to increase the speed of heating, digestion and mixing of water samples during the detection process, thereby improving the efficiency of water quality detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the box cross-section structure of a COD water quality online monitoring device described in the utility model;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of a digestion tank of a COD water quality online monitoring device described in the utility model;

[0022] Figure 3 This is a COD water quality online monitoring device described in the utility model. Figure 2 The enlarged structural diagram at A in the middle;

[0023] Figure 4 This is a COD water quality online monitoring device described in the utility model. Figure 2 The enlarged structural diagram at B in the middle;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of a conduit of a COD water quality online monitoring device described in the utility model;

[0025] Figure 6 This is a COD water quality online monitoring device described in the utility model. Figure 5 The enlarged structural diagram at C in the middle;

[0026] Figure 7 It is a schematic diagram of the overall structure of a COD water quality online monitoring device described in the utility model;

[0027] Figure 8 The utility model is a schematic diagram of the position structure of a cleaning roller and a detection probe of a COD water quality online monitoring device in a working state.

[0028] The following are the descriptions of the reference numerals:

[0029] 1. Box body; 2. Sampling unit; 21. First peristaltic pump; 22. First metering component; 23. First chain valve; 3. Dosing unit; 31. Second peristaltic pump; 32. Second metering component; 33. Second chain valve; 4. Digestion tank; 5. Cleaning unit; 51. Motor; 52. Active bevel gear; 53. Driven bevel gear; 54. Conduit; 55. Water guide valve; 56. Installation box; 57. Water outlet; 58. One-way valve; 59. Stirring rod; 510. Storage chamber; 511. Spring; 512. Installation rod; 513. Cleaning roller; 6. Heating unit; 61. Heating wire; 62. Temperature sensor; 7. Detection probe; 8. Baffle; 9. Control valve; 10. Drain pipe; 11. Working chamber; 12. Drug dispensing chamber; 13. Door panel; 14. Control component. DETAILED DESCRIPTION

[0030] like Figure 1-Figure 7As shown, a COD water quality online monitoring device includes a box body 1, a door panel 13 is rotatably installed on the side of the box body 1, a control component 14 is installed on the door panel 13, a working chamber 11 and a medicine placing chamber 12 are arranged in the box body 1, a sampling unit 2, a dosing unit 3 and a digestion tank 4 are arranged in the working chamber 11, the sampling unit 2 and the dosing unit 3 are connected to the digestion tank 4, a cleaning unit 5, a heating unit 6 and a detection probe 7 are arranged in the digestion tank 4, a control valve 9 is arranged on the lower surface of the digestion tank 4, a sewage pipe 10 is installed on the control valve 9, the control component 14 is electrically connected to an external power supply, the control component 14 and the detection probe 7 and the control valve 9 are electrically connected, and the control component 14 and the detection probe 7 and the control valve 9 work using existing technologies, such as Figure 1 , Figure 2 , Figure 7 As shown, the reagent used for detection is placed in the drug release chamber 12, the water quality sample is transported to the digestion tank 4 through the sampling unit 2, the water quality sample in the digestion tank 4 is heated and digested by the heating unit 6, and the reagent in the drug release chamber 12 is added to the digestion tank 4 by the drug adding unit 3, so that the water quality sample and the reagent are mixed and reacted, and the treated water quality sample in the digestion tank 4 is detected by the detection probe 7, and the quality of the water quality sample is determined according to the detection result, so as to complete the COD detection of the water quality sample. After the detection is completed, the sample is exported through the control valve 9 and the sewage pipe 10, and the digestion tank 4 and the detection probe 7 are cleaned by the cleaning unit 5 to avoid the accumulation of scale, so as to facilitate the subsequent detection and use, ensure the detection efficiency, and avoid the accumulation of scale affecting the detection of the detection probe 7, so as to ensure the accuracy of the detection result;

[0031] The cleaning unit 5 includes a driving assembly, a conduit 54, a water guide valve 55 and an installation box 56. The installation box 56 is installed on the lower surface of the digestion tank 4. The driving assembly and the water guide valve 55 are installed in the installation box 56. The conduit 54 is rotatably installed in the digestion tank 4 and the installation box 56. The conduit 54 is rotatably connected to the water guide valve 55. The conduit 54 is connected to the driving assembly in a transmission manner. A water outlet 57 and a stirring rod 59 are provided on the part of the conduit 54 located in the digestion tank 4. The water outlet 57 is inclined. A storage chamber 510 is provided on the end of the stirring rod 59. A buffer assembly is installed in the storage chamber 510. A cleaning roller 513 is installed on the buffer assembly. The water guide valve 55 is connected to an external pure water delivery device. The water guide valve 55 and the control assembly 14 are electrically connected. The water guide valve 55, the driving assembly and the buffer assembly work using existing technologies, such as Figure 2 , Figure 5 As shown, during the detection process, the driving component drives the stirring rod 59 to rotate through the conduit 54, and the stirring rod 59 stirs and mixes the sample and the reagent, so that the sample and the reagent are quickly mixed and reacted, effectively improving the detection speed. After the detection is completed, as shown in FIG. Figure 2 , Figure 5 , Figure 6As shown, the external pure water delivery device delivers pure water to the conduit 54 through the water guide valve 55, and the pure water in the conduit 54 is sprayed out through the water outlet 57, so that the pure water is delivered to the digestion tank 4 to rinse the digestion tank 4 and the detection probe 7. At the same time, the conduit 54 is driven to rotate by the driving component, so that the water flow sprayed from the water outlet 57 rinses different positions of the digestion tank 4 and the detection probe 7, thereby preventing the scale generated during the heating and digestion process of the water quality sample from accumulating in the digestion tank 4 and on the detection probe 7. At the same time, Figure 2 , Figure 4 , Figure 5 , Figure 8 As shown, the conduit 54 drives the cleaning roller 513 to rotate through the stirring rod 59 and the buffer assembly, thereby stirring the water flow in the digestion tank 4, and driving the scale through the stirred water flow. At the same time, the contact position of the cleaning roller 513 and the detection probe 7 is adjusted, and the different positions of the detection probe 7 are cleaned by the cleaning roller 513 to ensure the cleanliness of the surface of the detection probe 7, avoid the accumulation of scale affecting the accuracy of the detection result, improve the use time and efficiency during detection, reduce the number of cleaning times and the workload of the staff, and make the cleaning roller 513 and the detection probe 7 flexibly contact through the buffer assembly to avoid damage to the detection probe 7 during the cleaning process.

[0032] The driving assembly includes a motor 51 and a driven bevel gear 53. The motor 51 is mounted on the side of the mounting box 56. The output shaft of the motor 51 is rotatably connected to the mounting box 56. The driving bevel gear 52 is mounted on the part of the output shaft of the motor 51 located in the mounting box 56. The driven bevel gear 53 is mounted on the part of the conduit 54 located in the mounting box 56. The driven bevel gear 53 is meshed and connected to the driving bevel gear 52. The motor 51 and the control assembly 14 are electrically connected. The motor 51 works using existing technologies, such as Figure 2 As shown, the motor 51 drives the active bevel gear 52 to rotate, the active bevel gear 52 drives the driven bevel gear 53 to rotate, and the driven bevel gear 53 drives the guide tube 54 to rotate forward and reverse.

[0033] The buffer assembly includes a spring 511 and a mounting rod 512. The spring 511 is mounted in the storage chamber 510. The mounting rod 512 is slidably mounted on the stirring rod 59. The portion of the mounting rod 512 located in the storage chamber 510 is connected to the spring 511. The other end of the mounting rod 512 is connected to the cleaning roller 513. Figure 4 As shown, when the cleaning roller 513 follows the stirring rod 59 to move to the position of the detection probe 7, the spring 511 and the mounting rod 512 enable the cleaning roller 513 to buffer the contact with the detection probe 7, so that the cleaning roller 513 can effectively clean the detection probe 7 and avoid damage to the detection probe 7 caused by hard contact of the cleaning roller 513.

[0034] The interior of the conduit 54 is a cone with one end narrow and the other end wide. A one-way valve 58 is installed in the water outlet 57. The one-way valve 58 prevents the sample in the digestion tank 4 from flowing back into the water outlet 57. The conical design with one end narrow and the other end wide inside the conduit 54 allows the water flow to be evenly dispersed and transported in the conduit 54.

[0035] The sampling unit 2 includes a first peristaltic pump 21, a first metering component 22 and a first continuous valve 23. The first peristaltic pump 21, the first metering component 22 and the first continuous valve 23 are all installed in the working chamber 11. The discharge end of the first continuous valve 23 is connected to the first metering component 22 and the sewage pipe 10. The first metering component 22 is connected to the first peristaltic pump 21, and the first peristaltic pump 21 is connected to the digestion tank 4. The first peristaltic pump 21, the first metering component 22 and the first continuous valve 23 are electrically connected to the control component 14. The first peristaltic pump 21, the first metering component 22 and the first continuous valve 23 work using existing technologies, such as Figure 1 As shown, the first continuous valve 23 is connected to different external water quality delivery pipes. According to the water quality samples to be tested, the first peristaltic pump 21 samples the water quality samples through the first metering component 22 and the first continuous valve 23, and the amount of the water quality samples is controlled by the first metering component 22, so as to facilitate the addition of the amount of reagent according to the number of water quality samples, thereby ensuring the accuracy of the test results. The samples are transported to the digestion tank 4 for digestion detection through the first peristaltic pump 21. When the digestion tank 4 is cleaned, the first peristaltic pump 21 rotates in the opposite direction to extract the pure water in the digestion tank 4, and transports it in the opposite direction to the first metering component 22 and the first continuous valve 23, thereby flushing the first metering component 22 and the first continuous valve 23, avoiding the residual water quality samples in the first metering component 22 and the first continuous valve 23 from mixing and affecting the test results, thereby ensuring the accuracy of the test results, and the flushing waste water is discharged through the sewage pipe 10 for treatment.

[0036] The dosing unit 3 includes a second peristaltic pump 31, a second metering component 32 and a second continuous valve 33. The second peristaltic pump 31, the second metering component 32 and the second continuous valve 33 are all installed in the working chamber 11. The feed end of the second continuous valve 33 is connected to the medicine dispensing chamber 12, and the discharge end of the second continuous valve 33 is connected to the second metering component 32 and the sewage pipe 10. The second metering component 32 is connected to the second peristaltic pump 31, and the second peristaltic pump 31 is connected to the digestion tank 4. The second peristaltic pump 31, the second metering component 32 and the second continuous valve 33 are electrically connected to the control component 14. The second peristaltic pump 31, the second metering component 32 and the second continuous valve 33 work using existing technologies, such as Figure 1As shown, the second discharge valve 33 is connected to different reagents in the medicine release chamber 12. According to the reagents to be used, the second peristaltic pump 31 extracts the corresponding reagents in the medicine release chamber 12 through the second metering component 32 and the second discharge valve 33. The amount of the reagent is controlled by the second metering component 32, so that the reagent is added as needed to avoid waste of the reagent. The extracted reagent is transported to the digestion tank 4 by the second peristaltic pump 31, so that the reagent and the water quality sample react. When the digestion tank 4 is cleaned, the pure water in the digestion tank 4 is transported to the second metering component 32 and the second discharge valve 33 through the reverse rotation of the second peristaltic pump 31, so that the second metering component 32 and the second discharge valve 33 are flushed to avoid the mixing of the residual reagents in the second metering component 32 and the second discharge valve 33 to affect the effect of the reagents, thereby ensuring the accuracy of the test results. The flushing waste water is discharged through the sewage pipe 10 for treatment.

[0037] The heating unit 6 includes a heating wire 61 and a temperature sensor 62. The heating wire 61 and the temperature sensor 62 are both installed in the digestion tank 4. The heating wire 61 is located between the stirring rod 59 and the conduit 54. The heating wire 61 and the temperature sensor 62 are electrically connected to the control component 14. The heating wire 61 and the temperature sensor 62 work using existing technologies, such as Figure 2 As shown, the sample in the digestion tank 4 is heated by the heating wire 61, so that the water quality sample can better react with the reagent to ensure the efficiency of the detection. During the heating process, the temperature in the digestion tank 4 is detected by the temperature sensor 62, so as to facilitate the control of the temperature heated by the heating wire 61, so that the water quality sample in the digestion tank 4 is at the optimal reaction temperature, effectively improving the reaction speed.

[0038] Baffles 8 are installed on both sides of the connection between the heating wire 61 and the digestion tank 4. Figure 2 , Figure 3 As shown, the baffle 8 protects the heating wire 61, thereby preventing the heating wire 61 from being damaged during the rotation of the stirring rod 59.

[0039] Working principle: Figure 1 , Figure 7 As shown, the reagent to be used is placed in the medicine placement chamber 12, and the reagent is connected to the second row of valves 33, and the first row of valves 23 are respectively connected to different external water quality samples;

[0040] like Figure 1 As shown, according to the water quality sample to be tested, the first peristaltic pump 21 samples the water quality sample through the first metering component 22 and the first continuous valve 23, controls the amount of the water quality sample through the first metering component 22, and transports the sample to the digestion tank 4 for digestion testing through the first peristaltic pump 21;

[0041] like Figure 2 As shown, the sample in the digestion tank 4 is heated by the heating wire 61, and the temperature in the digestion tank 4 is detected by the temperature sensor 62, so as to control the temperature of the heating wire 61; at the same time, Figure 2 As shown, the motor 51 drives the active bevel gear 52 to rotate, the active bevel gear 52 drives the driven bevel gear 53 to rotate, the driven bevel gear 53 drives the conduit 54 to rotate forward and reversely, and the conduit 54 drives the stirring rod 59 to rotate, thereby stirring the water sample in the digestion tank 4 to increase the heating speed of the water sample; Figure 2 , Figure 3 As shown, during the rotation of the stirring rod 59, the heating wire 61 is protected by the baffle 8;

[0042] At the same time, if Figure 1 As shown, according to the reagents to be used, the second peristaltic pump 31 extracts the corresponding reagents in the medicine chamber 12 through the second metering component 32 and the second row valve 33, and the amount of the reagents is controlled by the second metering component 32. The extracted reagents are transported to the digestion tank 4 through the second peristaltic pump 31, so that the reagents and the water sample are mixed and reacted;

[0043] At the same time, if Figure 2 As shown, the stirring rod 59 is used to stir the water sample and the reagent to quickly mix and react, and then the detection probe 7 is used to detect the treated water sample in the digestion tank 4, and the quality of the water sample is determined according to the detection result, thereby completing the COD detection of the water sample; Figure 1 , Figure 2 As shown, after the detection is completed, the sample is exported through the control valve 9 and the sewage pipe 10;

[0044] After the test is completed, Figure 2 , Figure 5 , Figure 6 As shown, the external pure water delivery device delivers pure water to the conduit 54 through the water guide valve 55, and the pure water in the conduit 54 is sprayed out through the water outlet 57 and the one-way valve 58, thereby delivering the pure water to the digestion tank 4 to rinse the digestion tank 4 and the detection probe 7; at the same time, as Figure 2 As shown, the guide tube 54 is driven to rotate by the motor 51, the driving bevel gear 52 and the driven bevel gear 53, so that the water flow sprayed from the water outlet 57 flushes the different positions of the digestion tank 4 and the detection probe 7, so that the scale in the digestion tank 4 and on the detection probe 7 falls off;

[0045] At the same time, if Figure 2 , Figure 4 , Figure 5 , Figure 8As shown, the conduit 54 drives the cleaning roller 513 to rotate through the stirring rod 59 and the mounting rod 512, thereby stirring the water flow in the digestion tank 4, and driving the scale through the stirred water flow; at the same time, through the rotation of the stirring rod 59, the contact position of the cleaning roller 513 and the detection probe 7 is adjusted, and the cleaning roller 513 cleans different positions of the detection probe 7 to ensure the cleanliness of the surface of the detection probe 7; after the cleaning is completed, as shown in FIG. Figure 1 , Figure 2 As shown, the cleaned sewage is discharged through the control valve 9 and the sewage pipe 10; during the cleaning process, Figure 4 As shown, the spring 511 and the mounting rod 512 enable the cleaning roller 513 and the detection probe 7 to be in flexible contact, thereby avoiding damage to the detection probe 7 during the cleaning process;

[0046] At the same time, if Figure 1 , Figure 2 As shown, when the digestion tank 4 is cleaned, the first peristaltic pump 21 rotates in the reverse direction, and the first peristaltic pump 21 extracts the pure water in the digestion tank 4 and delivers it in the reverse direction to the first metering component 22 and the first continuous discharge valve 23, so as to flush the first metering component 22 and the first continuous discharge valve 23, and the flushing waste water is discharged through the sewage pipe 10 for treatment;

[0047] At the same time, if Figure 1 , Figure 2 As shown, the second peristaltic pump 31 rotates in the reverse direction, so that the pure water in the digestion tank 4 is transported to the second metering component 32 and the second discharge valve 33, so as to flush the second metering component 32 and the second discharge valve 33, and the flushing waste water is discharged through the sewage pipe 10 for treatment.

[0048] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A COD water quality online monitoring device, characterized in that: The invention comprises a box body (1), a door panel (13) is rotatably mounted on the side of the box body (1), a control component (14) is mounted on the door panel (13), a working chamber (11) and a medicine dispensing chamber (12) are arranged in the box body (1), a sampling unit (2), a medicine adding unit (3) and a digestion tank (4) are arranged in the working chamber (11), the sampling unit (2) and the medicine adding unit (3) are connected to the digestion tank (4), a cleaning unit (5), a heating unit (6) and a detection probe (7) are arranged in the digestion tank (4), a control valve (9) is arranged on the lower surface of the digestion tank (4), and a sewage discharge pipe (10) is mounted on the control valve (9); The cleaning unit (5) comprises a driving assembly, a conduit (54), a water guide valve (55) and an installation box (56); the installation box (56) is installed on the lower surface of the digestion tank (4); the driving assembly and the water guide valve (55) are installed in the installation box (56); the conduit (54) is rotatably installed in the digestion tank (4) and the installation box (56); the conduit (54) is rotatably connected to the water guide valve (55); the conduit (54) is transmission-connected to the driving assembly; a water outlet hole (57) and a stirring rod (59) are provided on the portion of the conduit (54) located in the digestion tank (4); the water outlet hole (57) is inclined; a storage chamber (510) is provided on the end of the stirring rod (59); a buffer assembly is installed in the storage chamber (510); and a cleaning roller (513) is installed on the buffer assembly.

2. A COD water quality online monitoring device according to claim 1, characterized in that: The driving assembly comprises a motor (51) and a driven bevel gear (53); the motor (51) is mounted on a side of the mounting box (56); the output shaft of the motor (51) is rotatably connected to the mounting box (56); a driving bevel gear (52) is mounted on the portion of the output shaft of the motor (51) located inside the mounting box (56); the driven bevel gear (53) is mounted on the portion of the conduit (54) located inside the mounting box (56); and the driven bevel gear (53) is meshedly connected to the driving bevel gear (52).

3. A COD water quality online monitoring device according to claim 1, characterized in that: The buffer assembly comprises a spring (511) and a mounting rod (512); the spring (511) is mounted in the storage cavity (510); the mounting rod (512) is slidably mounted on the stirring rod (59); the portion of the mounting rod (512) located in the storage cavity (510) is connected to the spring (511); and the other end of the mounting rod (512) is connected to the cleaning roller (513).

4. A COD water quality online monitoring device according to claim 1, characterized in that: The interior of the conduit (54) is in a tapered shape with one end narrow and the other end wide, and a one-way valve (58) is installed in the water outlet hole (57).

5. A COD water quality online monitoring device according to claim 1, characterized in that: The sampling unit (2) comprises a first peristaltic pump (21), a first metering component (22) and a first continuous discharge valve (23); the first peristaltic pump (21), the first metering component (22) and the first continuous discharge valve (23) are all installed in the working chamber (11); the discharge end of the first continuous discharge valve (23) is connected to the first metering component (22) and the sewage pipe (10); the first metering component (22) is connected to the first peristaltic pump (21); and the first peristaltic pump (21) is connected to the digestion tank (4).

6. A COD water quality online monitoring device according to claim 1, characterized in that: The dosing unit (3) comprises a second peristaltic pump (31), a second metering component (32) and a second continuous valve (33); the second peristaltic pump (31), the second metering component (32) and the second continuous valve (33) are all installed in the working chamber (11); the feed end of the second continuous valve (33) is connected to the drug dispensing chamber (12); the discharge end of the second continuous valve (33) is connected to the second metering component (32) and the sewage pipe (10); the second metering component (32) is connected to the second peristaltic pump (31); and the second peristaltic pump (31) is connected to the digestion tank (4).

7. A COD water quality online monitoring device according to claim 1, characterized in that: The heating unit (6) comprises a heating wire (61) and a temperature sensor (62), wherein the heating wire (61) and the temperature sensor (62) are both installed in the digestion tank (4), and the heating wire (61) is located between the stirring rod (59) and the conduit (54).

8. A COD water quality online monitoring device according to claim 7, characterized in that: Baffles (8) are installed on both sides of the connection between the heating wire (61) and the digestion tank (4).

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