CN213337673U - Full-automatic COD (chemical oxygen demand) analysis device - Google Patents

Abstract

The utility model discloses a full-automatic COD analysis device, including autoinjection module, additive module, digestion module, titration module, waste liquid collection module and host system, autoinjection module's output and digestion module's input intercommunication, additive module's output and digestion module's input intercommunication, digestion module's output and titration module's input intercommunication, titration module's output and waste liquid collection module intercommunication, host system communicates with autoinjection module, additive module, digestion module, titration module and waste liquid collection module communication respectively; the utility model has the advantages that: the bottle is cleared up without manual cleaning, and the bottle is automatically cleaned, so that the risk of contacting dangerous waste liquid is avoided.

Description

Full-automatic COD (chemical oxygen demand) analysis device

Technical Field

The utility model relates to a water quality monitoring field, more specifically relates to a full automatic analysis device of COD.

Background

The chemical oxygen demand of water quality is an important conventional monitoring index of current water quality monitoring, and plays a key indication role in prejudging the pollution degree of a water body. At present, two major monitoring methods, namely a titration method and a spectrophotometry method, are available for chemical oxygen demand. The dichromate method for measuring the chemical oxygen demand of the HJ828-2017 water quality is widely adopted because of the advantages of universality, accuracy, high precision and the like. However, the method has the problems of long time consumption, complicated manual operation steps, indirect contact with chemical reagents such as easily-prepared chemical sulfuric acid and the like. Therefore, a set of COD full-automatic analysis equipment needs to be designed.

At present, the domestic market has a COD automatic analysis robot, and relevant patents thereof include: chinese patent publication No. CN201810059775.4A discloses a laboratory COD automatic analysis machine, chinese patent publication No. CN201820102890.0U discloses a laboratory COD automatic analysis robot, and chinese patent publication No. CN201820526781.1U discloses an improved laboratory COD automatic analysis robot. However, the automatic COD analyzing robot still has the following problems: (1) after detection, the waste liquid needs to be manually collected and cleaned, and the digestion bottle cannot be automatically cleaned, so that the risk of contacting dangerous waste liquid is increased; (2) the sample cannot be automatically injected, and the sample still needs to be manually taken; (3) in the detection process, the mechanical arm clamps the container for multiple times, and clamping errors with high probability exist; (4) when the sample amount is larger, the time for the same batch of detection experiment with the same sample amount is longer because batch digestion and cooling are required.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve lies in prior art's COD analytical equipment and exists and need manual washing to clear up the bottle, can not self-cleaning, has increased the problem of the risk of contacting dangerous waste liquid.

The utility model discloses a following technical means realizes solving above-mentioned technical problem: the utility model provides a full autoanalysis device of COD, includes autoinjection module, additive module, clears up the module, titrates module, waste liquid collection module and host system, autoinjection module's output and the input intercommunication of clearing up the module, the output of additive module and the input intercommunication of clearing up the module clear up the output of module and the input intercommunication of titrating the module, titrate the output and the waste liquid collection module intercommunication of module, host system respectively with autoinjection module, additive module, clear up the module, titrate module and waste liquid collection module communication connection.

The utility model provides a full autoanalysis device of COD, the experimental module that relates to in the whole analytic process communicates according to the experiment flow to each module is connected with the host system communication, and through the operation of each module of host system control, accomplishes automatic control, because the automatic and each module intercommunication of whole process can accomplish pipeline self-cleaning, and finally wash the surplus liquid and collect through waste liquid collection module, need not manual washing and clear up the bottle, self-cleaning has avoided the risk of contacting dangerous waste liquid.

Furthermore, the automatic sampling module comprises a sample tube, a sampling needle, a first liquid pipeline, a first quantitative pump and a first mechanical arm, wherein the first quantitative pump and the first mechanical arm are installed on the first liquid pipeline, the sampling needle is communicated with the first liquid pipeline, the sampling needle is positioned below the first mechanical arm, the first mechanical arm drives the sampling needle to reach the position where the sample tube is located to complete sampling, and the first quantitative pump is in communication connection with the main control module.

Furthermore, the full-automatic COD analysis device further comprises a guide rail, wherein the guide rail is distributed above the automatic sample introduction module, the first mechanical arm slides along the guide rail on the automatic sample introduction module for a preset distance to reach the position right above the sample tube and descends for a preset distance to place the sample introduction needle in the sample tube for sampling.

Furthermore, the reagent adding module comprises a plurality of reagent tubes, a plurality of second liquid pipelines, a second quantitative pump and a second mechanical arm, reagent solution is arranged in each reagent tube, a liquid adding port is formed in the bottom of the second mechanical arm, a sample injection needle is communicated with the liquid adding port through a first liquid pipeline, the second quantitative pump is arranged in each reagent tube and is communicated with the second liquid pipeline through a second liquid pipeline, the second mechanical arm moves the liquid adding port to the position right above the digestion module, and the second quantitative pump is in communication connection with the main control module.

Furthermore, it includes a plurality of condenser pipes, a plurality of pipe, heating device of dispelling to clear up the module, every is cleared up intraduct well top and is all placed a condenser pipe and both contact surfaces sealing connection, the bottom of condenser pipe with clear up the pipe intercommunication, clear up in the heating device is arranged in the bottom of pipe, the pure water pipe passes through third liquid pipeline and filling opening intercommunication, set up the third constant delivery pump in the third liquid pipeline, clear up the socle portion and titrate the module and pass through fourth liquid pipeline intercommunication, set up first solenoid valve and clear up the constant delivery pump in the fourth liquid pipeline, third constant delivery pump, first solenoid valve and clear up the constant delivery pump and all be connected with the host system communication.

Furthermore, the titration module comprises a titration cup, a titration chamber, a fan, a magnetic temperature sensing device, a rotor, an indicator pipe, a fifth liquid pipeline, a second electromagnetic valve, a fourth quantitative pump, a ferrous ammonium sulfate reagent pipe, a sixth liquid pipeline, a third electromagnetic valve and a fifth quantitative pump, wherein the magnetic temperature sensing device comprises a magnetic stirring motor, a temperature sensor and a pressure sensor, the titration cup is positioned in the titration chamber, the fan is positioned on the sidewall of the titration chamber, the magnetic temperature sensing device is arranged at the bottom of the titration cup, the rotor is positioned in the titration cup, an output shaft of the magnetic stirring motor is connected with the rotor, the indicator pipe is communicated with the titration cup through the fifth liquid pipeline, the second electromagnetic valve for filling the indicator and the fourth quantitative pump for quantitatively outputting the indicator are arranged in the fifth liquid pipeline, and the ferrous ammonium sulfate reagent pipe is communicated with the titration cup through the sixth liquid pipeline, and a third electromagnetic valve for filling an ammonium ferrous sulfate reagent and a fifth quantitative pump for quantitatively outputting the reagent are arranged in the sixth liquid pipeline, and the magnetic stirring motor, the fan, the temperature sensor, the pressure sensor, the second electromagnetic valve, the fourth quantitative pump, the third electromagnetic valve and the fifth quantitative pump are all in communication connection with the main control module.

Furthermore, the waste liquid collecting module comprises a waste liquid barrel, a cleaning barrel, a liquid discharging pipeline, a waste liquid electromagnetic valve and a waste liquid peristaltic pump, the titration cup is communicated with the waste liquid barrel through the liquid discharging pipeline and is used for storing residual waste liquid, the liquid discharging pipeline is internally provided with the waste liquid electromagnetic valve and the waste liquid peristaltic pump, the waste liquid electromagnetic valve and the waste liquid peristaltic pump are communicated with the main control module, and the cleaning barrel is communicated with the titration cup through a seventh liquid pipeline and is used for storing waste water for cleaning the pipeline.

Further, the model number of the main control module is ST40 series.

Further, the full-automatic COD analysis device further comprises a display screen, and the display screen is connected with the main control module.

Further, the main control module is respectively connected with the automatic sample introduction module, the reagent adding module, the digestion module, the titration module and the waste liquid collection module through RS485 communication.

The utility model has the advantages that:

(1) the utility model provides a full autoanalysis device of COD, the experimental module that relates to in the whole analytic process communicates according to the experiment flow to each module is connected with the host system communication, and through the operation of each module of host system control, accomplishes automatic control, because the automatic and each module intercommunication of whole process can accomplish pipeline self-cleaning, and finally wash the surplus liquid and collect through waste liquid collection module, need not manual washing and clear up the bottle, self-cleaning has avoided the risk of contacting dangerous waste liquid.

(2) The utility model discloses a set up first arm and guide rail, fix the syringe in first arm below, reciprocate through the first arm of host system control all around and predetermine the distance, accomplish the sample and deliver to the sample of taking a sample and clear up the module, can realize the autoinjection, do not need the manual work to get the sample.

(3) The utility model discloses a sampling needle on the first arm realizes taking a sample to and fill reagent through the filling opening on the second arm, set up the filling opening that is used for the sampling needle of sample and is used for filling reagent on the arm, need not press from both sides and get the container, only need with the arm remove to the assigned position can, avoided pressing from both sides to get the error, avoid the risk and the instrument that reagent sputtering leads to fall to pound, guarantee experiment safety.

(4) Set up a plurality of pipes and a plurality of condenser pipe of clearing up, one clears up the experiment that the pipe corresponds a sample, accomplishes the experiment through the automatic reagent that adds of arm, can accomplish the experiment of many samples simultaneously, and when the sample volume is great, the same batch of detection experiment of the same sample volume can be cleared up and cooled down with the batch, and total required time is shorter.

(5) In the experimentation, clear up the mixture that does not relate to reagent and sample before, so clear up and need not rinse the pipeline before, so the utility model discloses thereby accessible control sets up the filling pure water of the work of third ration pump in the pure water pipe, and first ration pump, the second ration pump is out of work in other pipelines of simultaneous control and filling opening intercommunication, and corresponding pipeline does not switch on, realizes clearing up the washing of module and follow-up module, need not rinse whole reagent pipeline, and the waste water of production is few, and the scavenging period is short.

(6) Titrate and laid magnetic force temperature-sensing equipment in the module, the device can not only keep the intensive mixing of solution through the rotation of rotor, reduce because of mixing the inhomogeneous detection error that causes, still can play the heat dissipation function to the solution after the digestion, titrate the indoor wall simultaneously and install and be used for radiating fan, temperature sensor detects the temperature and feeds back to host system, wait to digest the liquid temperature and reduce and to open the titration process after setting for the temperature, ensure that the detection condition is unanimous, reduce the systematic error because of detecting the influence of condition and bringing.

(7) The utility model discloses the waste liquid collection module that sets up separately collects the reaction waste liquid of experimentation and the waste liquid of cleaning process, and the danger of being convenient for is useless handles the waste liquid of unit to the different grade type and handles.

Drawings

FIG. 1 is a block diagram of a fully automatic COD analyzer according to an embodiment of the present invention;

FIG. 2 is an electrical schematic diagram of a fully automatic COD analyzer disclosed in the embodiment of the present invention;

FIG. 3 is a front view of an automatic sample feeding module in the full-automatic COD analyzer disclosed in the embodiment of the present invention;

FIG. 4 is a top view of an automatic sample feeding module in the full-automatic COD analyzer disclosed in the embodiment of the present invention;

FIG. 5 is a schematic view of a digestion module in the full-automatic COD analyzer disclosed in the embodiment of the present invention;

fig. 6 is a schematic view of a titration module in a COD full-automatic analyzer disclosed in the embodiment of the present invention.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in figure 1 and figure 2, a full autoanalyzer of COD, including autoinjection module 1, with reagent module 2, clear up module 3, titrate module 4, waste liquid collection module 5 and host system 6, autoinjection module 1's output and clear up module 3's input intercommunication, reagent module 2's output and clear up module 3's input intercommunication, clear up module 3's output and titrate module 4's input intercommunication, titrate module 4's output and waste liquid collection module 5 intercommunication. The model number of the main control module 6 is ST40 series. The full-automatic COD analysis device further comprises a display screen, and the display screen is connected with the main control module 6. The main control module 6 is respectively connected with the automatic sample introduction module 1, the reagent adding module 2, the digestion module 3, the titration module 4 and the waste liquid collection module 5 through RS485 communication.

As shown in fig. 3 and 4, the automatic sample introduction module 1 includes a sample tube 101, a sample introduction needle 102, a first liquid pipeline, a first quantitative pump 103 installed on the first liquid pipeline, and a first mechanical arm 105, the sample introduction needle 102 is communicated with the first liquid pipeline, the sample introduction needle 102 is located below the first mechanical arm 105, and the first quantitative pump 103 is in communication connection with the main control module 6. The full-automatic COD analysis device further comprises a guide rail, the guide rail is distributed above the automatic sample injection module 1 and above the digestion module 3, the working principle and the process of the first mechanical arm 105 and the second mechanical arm belong to the prior art, and the general principle process is as follows: the sample tube 101 has a plurality of and is the regular arrangement of matrix, how much distance that can set for to slide according to the diameter of sample tube 101 and the interval between sample tube 101 and the sample tube 101 arrives appointed sample tube 101, first arm 105 slides along the guide rail on the autoinjection module 1 and predetermines the distance and reachs sample tube 101 directly over and descend and predetermine the distance and place sample needle 102 in sample tube 101, thereby the sampling needle 102 sample is controlled to the first quantitative pump 103 of main control module 6 control electricity work, the sample flows in the filling opening through first liquid pipeline.

Continuing to refer to fig. 2, the reagent adding module 2 includes a plurality of reagent tubes (not shown), a plurality of second liquid pipelines (not shown), a liquid filling port (not shown), a second dosing pump 201 and a second mechanical arm (not shown), wherein each reagent tube contains a reagent solution, the bottom of the second mechanical arm is provided with the liquid filling port, the sample injection needle 102 is communicated with the liquid filling port through a first liquid pipeline, each reagent tube is communicated with the liquid filling port through a second liquid pipeline, the second liquid pipeline is provided with the second dosing pump 201, the second mechanical arm moves the liquid filling port to send the reagent solution to the digestion module 3, and the second dosing pump 201 is in communication connection with the main control module 6. The commonly used reagent solution includes four reagents, i.e., high-concentration potassium dichromate, low-concentration potassium dichromate, mercury sulfate, and sulfuric acid-silver sulfate, in this embodiment, each reagent corresponds to one reagent tube, each reagent tube corresponds to one second quantitative pump 201, the four solutions, i.e., the high-concentration potassium dichromate, the low-concentration potassium dichromate, the mercury sulfate, and the sulfuric acid-silver sulfate, are respectively sent to the liquid filling port through a plurality of liquid pipelines, and each reagent corresponds to one second liquid pipeline, so that there are four second liquid pipelines in total.

As shown in fig. 5 and fig. 2, the digestion module 3 includes a plurality of condensation pipes 301, a plurality of digestion pipes 302, and a heating device 303, wherein one condensation pipe 301 is disposed above and in each digestion pipe 302, the contact surface of the two is sealed by grinding, the bottom of the condensation pipe 301 is communicated with the digestion pipe 302, the bottom of the digestion pipe 302 is disposed in the heating device 303, and the pure water pipe is communicated with the liquid filling port through a third liquid pipeline. A third quantitative pump 304 is arranged in the third liquid pipeline, the bottom of the digestion pipe 302 is communicated with the titration module 4 through a fourth liquid pipeline, a first electromagnetic valve 306 and a digestion quantitative pump 307 are arranged in the fourth liquid pipeline, and the third quantitative pump 304, the first electromagnetic valve 306 and the digestion quantitative pump 307 are all in communication connection with the main control module 6. And (5) digesting for 2 hours after the reagent is added. After cooling, 45mL of pure water was added to the digestion tube 302 via the third metering pump 304. The mixed digestion solution is transferred into the titration cup 401 through a fourth liquid line inserted into the bottom of the digestion tube 302 by controlling the first solenoid valve 306 and the digestion quantitative pump 307. The heating device 303 may be an electric heater. It should be noted that, in order to prevent that sample, reagent and pure water from revealing, the utility model discloses can all set up the solenoid valve and whether control the pipeline break-make through main control module 6 control solenoid valve that the solenoid valve is got powered or not at first liquid pipeline, many second liquid pipelines and third liquid pipeline, in addition, because first liquid pipeline, second liquid pipeline and third liquid pipeline all communicate with the filling opening, in order to save resources, simplified equipment can only set up a solenoid valve at the filling opening.

As shown in fig. 6 and fig. 2, the titration module 4 includes a titration cup 401, a titration chamber 402, a blower 403, a magnetic temperature sensing device 412, a rotor 404, an indicator tube, a fifth liquid pipeline, a second electromagnetic valve 408, a fourth quantitative pump 409, a ferrous ammonium sulfate reagent tube, a sixth liquid pipeline, a third electromagnetic valve 410, and a fifth quantitative pump 411, the magnetic temperature sensing device 412 includes a magnetic stirring motor 405, a temperature sensor 406, and a pressure sensor 407, the titration cup 401 is located in the titration chamber 402, the blower 403 is located on a sidewall of the titration chamber 402, the magnetic temperature sensing device 412 is disposed at the bottom of the titration cup 401, the rotor 404 is located in the titration cup 401, an output shaft of the magnetic stirring motor 405 is connected to the rotor 404, the indicator tube is communicated with the titration cup 401 through the fifth liquid pipeline, the fifth liquid pipeline is disposed with the second electromagnetic valve 408 for filling indicator and the fourth quantitative pump 409 for quantitatively outputting indicator, the ammonium ferrous sulfate reagent pipe is communicated with the titration cup 401 through a sixth liquid pipeline, a third electromagnetic valve 410 for filling the ammonium ferrous sulfate reagent and a fifth quantitative pump 411 for quantitatively outputting the reagent are arranged in the sixth liquid pipeline, and the magnetic stirring motor 405, the fan 403, the temperature sensor 406, the pressure sensor 407, the second electromagnetic valve 408, the fourth quantitative pump 409, the third electromagnetic valve 410 and the fifth quantitative pump 411 are all in communication connection with the main control module 6. Once solution enters the titration cup 401, the pressure sensor 407 senses the weight, the pressure sensor 407 transmits data to the main control module 6, the main control module 6 enables the control fan 403 to be automatically turned on, the magnetic stirring motor 405 is controlled to be started, the magnetic stirring motor 405 drives the rotor 404 to rotate, and the solution is uniformly mixed under the driving of the rotor 404. The temperature sensor 406 detects the temperature of the digestion liquid and transmits temperature data to the main control module 6, and when the temperature of the digestion liquid is reduced to be below 30 ℃, the indicator with preset volume is added into the titration cup 401 by opening the second electromagnetic valve 408 and the fourth quantitative pump 409. After 2min, ammonium ferrous sulfate is added into the titration cup 401 drop by drop through a third electromagnetic valve 410 for filling an ammonium ferrous sulfate reagent and a fifth quantitative pump 411 for quantitatively outputting the reagent until the titration end point, and the main control module 6 automatically records the titration amount according to the revolution number of the fifth quantitative pump 411. The titration end point is determined according to a biomimetic color recognition technology, belongs to the content of algorithms in the prior art, is not within the protection scope of the application, and is not described herein in detail.

Continuing to refer to fig. 2, waste liquid collection module 5 includes waste liquid bucket, washing bucket, drainage pipeline, clears up waste liquid solenoid valve 501 and clears up waste liquid peristaltic pump 502, titration cup 401 is used for the remaining waste liquid of storage reaction through drainage pipeline and waste liquid bucket intercommunication, sets up in the drainage pipeline and clears up waste liquid solenoid valve 501 and clear up waste liquid peristaltic pump 502, clears up waste liquid solenoid valve 501 and clears up waste liquid peristaltic pump 502 all with the communication of host system 6 and be connected, it communicates with titration cup 401 through seventh liquid pipeline to wash the bucket for the waste water of storage washing pipeline.

It should be noted that the present invention only protects the mechanical structure and the circuit architecture, and the related internal control logic of the main control module 6 belongs to the technical field, and the circuit architecture disclosed by the present invention is easily conceivable, and does not belong to the protection scope of the present application.

Through the technical scheme, the utility model provides a pair of full automatic analysis device of COD, the experimental module that relates to among the whole analytic process is according to the experiment flow intercommunication to each module is connected with the 6 communications of host system, through the operation of each module of host system 6 control, accomplish automatic control, because whole process is automatic and each module intercommunication, can accomplish pipeline self-cleaning, and finally wash surplus liquid and pass through waste liquid collection module 5 and collect, need not manual washing and clear up the bottle, self-cleaning has avoided the risk of the dangerous waste liquid of contact.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. The utility model provides a full autoanalysis device of COD, its characterized in that, including autoinjection module, additive module, clear up the module, titrate module, waste liquid collection module and host system, autoinjection module's output and the input intercommunication of clearing up the module, the output of additive module and the input intercommunication of clearing up the module clear up the output of module and the input intercommunication of titrating the module, titrate the output and the waste liquid collection module intercommunication of module, host system respectively with autoinjection module, additive module, clear up the module, titrate module and waste liquid collection module communication connection.

2. The COD full-automatic analysis device according to claim 1, wherein the automatic sample introduction module comprises a sample tube, a sample introduction needle, a first liquid pipeline, a first quantitative pump installed on the first liquid pipeline, and a first mechanical arm, the sample introduction needle is communicated with the first liquid pipeline, the sample introduction needle is located below the first mechanical arm, the first mechanical arm drives the sample introduction needle to reach the position where the sample tube is located to complete sampling, and the first quantitative pump is in communication connection with the main control module.

3. The full-automatic COD analyzer according to claim 2, further comprising a guide rail, wherein the guide rail is distributed above the automatic sample injection module, and the first mechanical arm slides along the guide rail.

4. The full-automatic COD analysis device according to claim 2, wherein the reagent adding module comprises a plurality of reagent tubes, a plurality of second liquid pipelines, a second quantitative pump and a second mechanical arm, each reagent tube contains a reagent solution, a liquid adding port is arranged at the bottom of the second mechanical arm, the sample injection needle is communicated with the liquid adding port through the first liquid pipeline, each reagent tube is communicated with the liquid adding port through one second liquid pipeline, the second quantitative pump is arranged in the second liquid pipeline, the second mechanical arm moves the liquid adding port to a position right above the digestion module, and the second quantitative pump is in communication connection with the main control module.

5. The COD full-automatic analysis device according to claim 4, wherein the digestion module comprises a plurality of condensation pipes, a plurality of digestion pipes and a heating device, one condensation pipe is arranged above and in the middle of each digestion pipe, the contact surface of the condensation pipe and the contact surface of the condensation pipe are hermetically connected, the bottom of each condensation pipe is communicated with the digestion pipe, the bottom of each digestion pipe is arranged in the heating device, each pure water pipe is communicated with the liquid adding port through a third liquid pipeline, a third constant delivery pump is arranged in each third liquid pipeline, the bottom of each digestion pipe is communicated with the titration module through a fourth liquid pipeline, a first electromagnetic valve and a digestion constant delivery pump are arranged in each fourth liquid pipeline, and the third constant delivery pump, the first electromagnetic valve and the digestion constant delivery pumps are all in communication connection with the main control module.

6. The COD full-automatic analysis device according to claim 5, wherein the titration module comprises a titration cup, a titration chamber, a fan, a magnetic temperature sensing device, a rotor, an indicator tube, a fifth liquid pipeline, a second electromagnetic valve, a fourth quantitative pump, a ferrous ammonium sulfate reagent tube, a sixth liquid pipeline, a third electromagnetic valve and a fifth quantitative pump, the magnetic temperature sensing device comprises a magnetic stirring motor, a temperature sensor and a pressure sensor, the titration cup is positioned in the titration chamber, the fan is positioned on the side wall of the titration chamber, the magnetic temperature sensing device is arranged at the bottom of the titration cup, the rotor is positioned in the titration cup, an output shaft of the magnetic stirring motor is connected with the rotor, the indicator tube is communicated with the titration cup through the fifth liquid pipeline, the second electromagnetic valve for filling the indicator and the fourth quantitative pump for quantitatively outputting the indicator are arranged in the fifth liquid pipeline, the ammonium ferrous sulfate reagent pipe is communicated with the titration cup through a sixth liquid pipeline, a third electromagnetic valve used for filling the ammonium ferrous sulfate reagent and a fifth quantitative pump used for quantitatively outputting the reagent are arranged in the sixth liquid pipeline, and the magnetic stirring motor, the fan, the temperature sensor, the pressure sensor, the second electromagnetic valve, the fourth quantitative pump, the third electromagnetic valve and the fifth quantitative pump are all in communication connection with the main control module.

7. The COD full-automatic analysis device according to claim 6, wherein the waste liquid collection module comprises a waste liquid barrel, a cleaning barrel, a liquid discharge pipeline, a digestion waste liquid solenoid valve and a digestion waste liquid peristaltic pump, the titration cup is communicated with the waste liquid barrel through the liquid discharge pipeline for storing residual waste liquid after reaction, the digestion waste liquid solenoid valve and the digestion waste liquid peristaltic pump are arranged in the liquid discharge pipeline, the digestion waste liquid solenoid valve and the digestion waste liquid peristaltic pump are both in communication connection with the main control module, and the cleaning barrel is communicated with the titration cup through a seventh liquid pipeline for storing waste water after cleaning the pipeline.

8. The fully automatic COD analyzer according to claim 1, wherein the model of the main control module is ST40 series.

9. The full-automatic COD analysis device according to claim 1, further comprising a display screen, wherein the display screen is connected with the main control module.

10. The full-automatic COD analysis device according to claim 1, wherein the main control module is respectively connected with the automatic sample introduction module, the reagent adding module, the digestion module, the titration module and the waste liquid collection module through RS485 communication.

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