Concentration measuring device with automatic weighing and automatic diluting functions

Abstract

The invention discloses a concentration measuring device with automatic weighing and automatic dilution functions, which realizes full-process automation of sample weighing, intelligent dilution and potentiometric titration by virtue of a symmetrical partition design of a left reagent bottle component and a right sample dilution system and in combination with a high-precision mechanical arm, a dynamic dilution compensation algorithm and a micro-upgrading titration cell. A split type magnetic coupling peristaltic pump, a multi-shaft linkage stirring mechanism and an anti-pollution electrode probe are innovatively adopted, and the detection precision (the weighing error is smaller than or equal to 0.1 mg, and the dilution repeatability CV is smaller than 0.5%) and the efficiency (the single sample detection period is smaller than or equal to 5 minutes) are remarkably improved. The device is particularly suitable for high-throughput analysis of trace samples, and meets the strict requirements of the fields of biological medicine, environmental monitoring and the like on automation and pollution prevention.

Description

Technical Field

[0001] The present invention relates to a concentration measuring device with automatic weighing and automatic dilution functions. Background Art

[0002] An automatic potentiometric titrator is a common analytical instrument for concentration analysis designed based on the potentiometric principle. The principle of potentiometry is as follows: An appropriate indicator electrode and a reference electrode are selected to form a working battery with the solution to be measured. As the titrant is added, due to chemical reactions, the concentration of the ions to be measured continuously changes, and thus the potential of the indicator electrode changes accordingly.

[0003] With the continuous improvement of scientific research, the demand for the use of automatic potentiometric titrators is also increasing. Traditional potentiometric titrators usually require manual weighing and dilution of samples, and then the samples are transferred to a titration container for titration. This operation method has the following disadvantages:

[0004] 1. Complicated operation and low efficiency: The steps of manual weighing, dilution, and transfer of samples are cumbersome and time-consuming, reducing the analysis efficiency;

[0005] 2. Influence of human error on results: Manual operation is prone to introducing errors, such as inaccurate weighing, inaccurate dilution ratio, incomplete sample transfer, etc., affecting the accuracy and repeatability of the analysis results;

[0006] 3. Difficulty in achieving automation: Manual operation is difficult to achieve automation, restricting the application of potentiometric titrators in scenarios such as on-line analysis and unattended operation. Summary of the Invention

[0007] The purpose of the present invention is to provide a concentration measuring device with automatic weighing and automatic dilution functions to solve the problems raised in the above background art.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A concentration measuring device with automatic weighing and automatic dilution functions includes the following modules:

[0010] Left reagent bottle component: It includes a reagent bottle, a reagent feeding conduit, and a sealing piston. The reagent bottle stores various reagents through the sealing piston. The reagent feeding conduit is connected to a peristaltic pump system and is used to deliver reagents to the automatic potentiometric titration system as needed;

[0011] Automatic potentiometric titration system: It includes an automatic potentiometric titrator, a fixing module, and a chassis. The automatic potentiometric titrator is fixed to the chassis through the fixing module and is used to monitor the solution concentration in real time by potentiometry and determine the titration end point;

[0012] Peristaltic pump system: including a power pump, a top pressure piston, a liquid adding unit and a titration unit. The power pump drives the top pressure piston to achieve reciprocating motion. The liquid adding unit and the titration unit respectively complete the reagent delivery, sample dilution and titration operations through the reciprocating motion of the piston;

[0013] Automatic weighing system: including an electronic balance, a sample tray and a mechanical arm, wherein the mechanical arm is used to grab the sample tray to the electronic balance for weighing, and transfer it to the right dilution system for dilution and then return it to the titration position; right dilution system: including a quantitative liquid doser, a diluent storage bottle and a stirring device, wherein the quantitative liquid doser accurately measures the diluent according to the preset dilution multiple, and the stirring device dynamically mixes the diluent and the sample through a stirring rod;

[0014] Central control unit: Integrates weighing feedback module, dilution multiple calculation module and titration endpoint determination algorithm to achieve closed-loop control of the entire process from weighing, dilution to titration.

[0015] Preferably, the left reagent bottle component and the right dilution system are symmetrically distributed to form a cross-contamination prevention partition structure, wherein:

[0016] A one-way valve is built into the reagent feed conduit of the left reagent bottle component to prevent reagent backflow; a liquid cooling pipeline is provided between the quantitative liquid adder of the right dilution system and the diluent storage bottle to maintain the diluent temperature constant within the range of ±0.5°C.

[0017] Preferably, the top pressure piston of the peristaltic pump system adopts a split design, including: a piston driving part, which is connected to the power pump through a magnetic coupling transmission to achieve contactless power transmission; a piston actuator, with a built-in pressure sensor, which monitors the pipeline pressure in real time and feeds back to the central control unit, and dynamically adjusts the piston movement speed to maintain flow stability (fluctuation ≤±0.8%).

[0018] Preferably, the end effector of the robotic arm adopts a composite structure of vacuum adsorption and mechanical grippers to adapt to sample trays of different specifications; the motion path planning module dynamically optimizes the movement trajectory based on the sample transfer priority and the robotic arm load, shortening the single transfer time to ≤3 seconds; it is equipped with a visual positioning component to coordinate the position of the sample tray through a laser rangefinder and a CCD camera, with a positioning accuracy of ±0.05mm.

[0019] Preferably, the stirring device includes a multi-axis linkage stirring mechanism, which is composed of a main stirring rod and an auxiliary vortex generator. While the main stirring rod performs circular motion, the auxiliary vortex generator generates vertical vortices; an impedance monitoring unit detects the impedance change of the mixed liquid in real time, and determines that the mixing is uniform when the impedance fluctuation rate is ≤1%.

[0020] Preferably, the central control unit includes: a dynamic dilution compensation algorithm that automatically corrects the dilution factor according to the deviation between the weighing result and the target concentration and feeds it back to the metering liquid addition device; a titration endpoint prediction model that integrates potential mutation detection and a convolutional neural network (CNN) to terminate the titration 100 ms before the theoretical endpoint, reducing over-titration errors;

[0021] A fault self-recovery module that automatically switches to a standby flow path and re-initializes the system when a robotic arm positioning deviation or pipeline blockage is detected.

[0022] Preferably, the automatic potentiometric titrator further includes:

[0023] A three-electrode integrated probe that integrates a pH glass electrode, a reference electrode, and a temperature compensation electrode, with a nano anti-fouling coating on the probe surface to reduce protein adsorption;

[0024] A micro-liter titration cell with an effective volume of 0.5 - 2 ml and spiral flow guide grooves on the inner wall of the cell.

[0025] Preferably, an environmental isolation chamber that covers the left reagent bottle component and the right sample dilution system, maintaining a positive pressure and a humidity ≤ 30% RH inside the chamber;

[0026] A waste liquid recovery module that collects waste reagents and cleaning liquids by negative pressure adsorption, and a waste liquid separation unit stores waste liquids classified by pH value.

[0027] Preferably, the sample tray is transferred to an electronic balance by a robotic arm, and the weighing data is uploaded to the central control unit in real time;

[0028] Calculate the dilution factor according to the target concentration, control the metering liquid addition device to inject the dilution liquid, and simultaneously start the multi-axis linkage stirring mechanism;

[0029] After dilution is completed, the robotic arm transfers the sample to the micro-liter titration cell, and starts the top-pressure piston for titration; collect the potential signal using the three-electrode integrated probe, determine the endpoint through the titration endpoint prediction model, and generate a test report;

[0030] Execute the automatic cleaning program of the environmental isolation chamber, and classify and process the waste liquid through the waste liquid recovery module.

[0031] Compared with the prior art, the beneficial effects of the present invention are: The potentiometric titrator integrating automatic weighing and automatic dilution functions has the following advantages:

[0032] 1. High degree of automation: Through the cooperation of the electronic balance and the robotic arm, the automation of the sample weighing, dilution, and titration processes is achieved, reducing the manual operation steps and improving the analysis efficiency.

[0033] 2. Submission analysis accuracy: Automation and precise control reduce errors caused by manual operations, improving the accuracy and repeatability of analysis results.

[0034] 3. Wide application range: It can be applied to scenarios such as on-line analysis and unattended operation, expanding the application range of the potentiometric titrator. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of the present invention.

[0036] Figure 2 It is a detailed view of the split magnetic coupling structure of the peristaltic pump system;

[0037] Figure 3 It is a flowchart of the dynamic dilution compensation algorithm;

[0038] Figure 4 It is a schematic diagram of the working state of the multi-axis linkage stirring mechanism.

[0039] In the figure: 1 left reagent bottle component, 2 automatic potentiometric titration system, 3 peristaltic pump system, 4 electronic balance, 5 sample tray, 6 robotic arm, 7 right sample dilution system, 8 stirring device, 201 power pump, 202 top-pressure piston, 203 magnet assembly, 204 pipeline system, 205 pressure sensor, 401 auxiliary eddy current generator, 402 main stirring rod, 403 impedance monitoring unit. DETAILED DESCRIPTION OF THE INVENTION

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Please refer to Figures 1-4 , the present invention provides a technical solution:

[0042] A concentration measurement device with automatic weighing and automatic dilution functions, characterized in that it includes the following modules:

[0043] Left reagent bottle component 1: It includes a reagent bottle, a reagent feed conduit and a sealing piston. The reagent bottle stores various reagents through the sealing piston, and the reagent feed conduit is connected to the peristaltic pump system for delivering reagents to the automatic potentiometric titration system as needed;

[0044] Automatic potentiometric titration system 2: It includes an automatic potentiometric titrator, a fixing module and a chassis. The automatic potentiometric titrator is fixed on the chassis through the fixing module for real-time monitoring of the solution concentration by potentiometry and determining the titration end point;

[0045] Peristaltic pump system 3: comprising a power pump 201, a top pressure piston 202, a liquid adding unit and a titration unit, wherein the power pump drives the top pressure piston to realize reciprocating motion, and the liquid adding unit and the titration unit respectively complete reagent delivery, sample dilution and titration operations through the reciprocating motion of the piston;

[0046] Automatic weighing system: comprising an electronic balance 4, a sample tray 5 and a mechanical arm 6, wherein the mechanical arm is used to grab the sample tray to the electronic balance for weighing, and transfer it to the right sample dilution system to complete dilution and then send it back to the titration position;

[0047] Right sample dilution system 7: comprising a quantitative liquid dosing device, a diluent storage bottle and a stirring device, wherein the quantitative liquid dosing device accurately measures the diluent according to a preset dilution multiple, and the stirring device dynamically mixes the diluent and the sample through a stirring rod;

[0048] Central control unit: Integrates weighing feedback module, dilution multiple calculation module and titration endpoint determination algorithm to achieve closed-loop control of the entire process from weighing, dilution to titration.

[0049] The left reagent bottle component and the right sample dilution system are symmetrically distributed to form a cross-contamination prevention partition structure, wherein: the reagent feed conduit of the left reagent bottle component 1 has a built-in one-way valve to prevent the reagent from flowing back; a liquid cooling pipeline is provided between the quantitative liquid adder of the right sample dilution system 7 and the diluent storage bottle to maintain the diluent temperature constant within the range of ±0.5°C.

[0050] The top pressure piston of the peristaltic pump system 3 adopts a split design, including: a piston driving part, which is connected to the power pump through a magnet assembly 203 to achieve magnetic coupling transmission, thereby realizing contactless power transmission; a piston actuator, with a built-in pressure sensor 205, which monitors the pipeline pressure in real time and feeds back to the central control unit, and dynamically adjusts the piston movement speed to maintain flow stability (fluctuation ≤±0.8%).

[0051] The end effector of the robotic arm adopts a composite structure of vacuum adsorption and mechanical grippers, which is suitable for sample trays of different specifications; the motion path planning module dynamically optimizes the movement trajectory based on the sample transfer priority and the robotic arm load, shortening the single transfer time to ≤3 seconds; it is equipped with a visual positioning component, which coordinates the position of the sample tray through a laser rangefinder and a CCD camera, with a positioning accuracy of ±0.05mm.

[0052] The stirring device 8 includes a multi-axis linkage stirring mechanism, which is composed of a main stirring rod 402 and an auxiliary vortex generator. When the main stirring rod performs a circular motion, the auxiliary vortex generator generates a vertical vortex; an impedance monitoring unit 403 detects the impedance change of the mixed liquid in real time, and determines that the mixing is uniform when the impedance fluctuation rate is ≤1%.

[0053] The central control unit includes: a dynamic dilution compensation algorithm, which automatically corrects the dilution multiple according to the deviation between the weighing result and the target concentration and feeds it back to the quantitative liquid dispenser;

[0054] The dilution multiple is corrected in real time according to the weighing result, and the formula is as follows:

[0055] C 实际 = C 目标 × (W 实测 / W 理论 )

[0056] wherein, W 理论 is the preset sample weight, and W 实测 is the measured value of the electronic balance;

[0057] A titration end point prediction model, which integrates potential mutation detection and a convolutional neural network (CNN), terminates the titration 100 ms before reaching the theoretical end point to reduce over-titration error;

[0058] A fault self-recovery module, which automatically switches to a standby flow path and re-initializes the system when a robotic arm positioning deviation or pipeline blockage is detected.

[0059] The automatic potentiometric titrator further includes:

[0060] A three-electrode integrated probe, which integrates a pH glass electrode, a reference electrode and a temperature compensation electrode, and the surface of the probe is coated with a nano anti-fouling coating to reduce protein adsorption;

[0061] A micro-liter titration cell with an effective volume of 0.5 - 2 ml, and a spiral diversion groove is provided on the inner wall of the cell.

[0062] An environmental isolation chamber, which covers the left reagent bottle component and the right sample dilution system, and maintains a positive pressure and humidity

[0063] ≤ 30% RH;

[0064] A waste liquid recovery module, which collects waste reagents and cleaning solutions by negative pressure adsorption, and the waste liquid separation unit stores the waste liquid by pH value classification.

[0065] A control method for a concentration determination device with automatic weighing and automatic dilution functions includes the following steps: moving the sample tray to the electronic balance through the robotic arm, and uploading the weighing data to the central control unit in real time; calculating the dilution multiple according to the target concentration, controlling the quantitative liquid dispenser to inject the dilution liquid, and synchronously starting the multi-axis linkage stirring mechanism;

[0066] After dilution is completed, the robotic arm moves the sample to the micro-liter titration cell, and starts the top-pressure piston for titration; collecting the potential signal by using the three-electrode integrated probe, determining the end point through the titration end point prediction model and generating a test report;

[0067] Execute the automatic cleaning program of the environmental isolation chamber and classify and process the waste liquid through the waste liquid recovery module.

[0068] Example 1:

[0069] Application scenario: A biopharmaceutical enterprise needs to quickly detect the concentration of active ingredients in batch injections, requiring high detection accuracy and avoiding cross-contamination.

[0070] Operation process:

[0071] 1. Sample preparation: The robotic arm (6) grabs the 0.5 ml injection sample tray (5) to the electronic balance (4), and the net weight is measured to be 0.5123 g (error ±0.1 mg);

[0072] 2. Intelligent dilution: The central control unit calculates that it needs to be diluted 50 times according to the target concentration (10 μg / ml), the quantitative liquid addition device (7) injects 25.6 ml of buffer solution, and the multi-axis stirring mechanism (8) is started to mix (impedance volatility 0.7%);

[0073] 3. Micro-titration: Transfer 0.8 ml of the diluted solution to the micro-liter titration cell, and the peristaltic pump (3) drips the standard binding reagent at a speed of 0.02 ml / s, and the three-electrode probe monitors the pH change in real time;

[0074] 4. Endpoint determination: The CNN model terminates the titration 100 ms before the potential mutation, and the actual concentration is measured

[0075] 9.98 μg / ml (RSD = 0.15%);

[0076] 5. Anti-pollution treatment: The environmental isolation chamber starts positive pressure cleaning, and the waste liquid is stored classified according to pH 7.4.

[0077] Technical embodiment:

[0078] 50-fold high-precision dilution (CV = 0.2%);

[0079] 0.8 ml micro-detection (conventional equipment requires 5 ml);

[0080] The anti-pollution system ensures zero cross-contamination of biological samples.

[0081] Example 2: Environmental monitoring - heavy metal detection in industrial wastewater

[0082] Application scenario: The environmental monitoring station needs to detect the Cu 2+ concentration in the wastewater of the electroplating factory. The sample has strong corrosiveness and needs to be processed quickly and in batches.

[0083] Operation process:

[0084] 1. Automatic protection: When the humidity in the environmental isolation chamber drops to 25% RH, it prevents the corrosion of acidic steam.

[0085] 2. Weighing compensation: When the robotic arm transfers a 2.0 g wastewater sample and sudden vibration occurs, the dynamic mass tracking algorithm corrects the weighing value to 2.0005 g through Kalman filtering.

[0086] 3. Dynamic dilution: When the target concentration is 0.1 ppm and it needs to be diluted 1000 times, due to the density deviation of the sample (measured 1.12 g / cm 3 ), the density adaptive algorithm adjusts the liquid addition volume to 2.24 L.

[0087] 4. Anti-fouling titration: Using a nano-coated electrode (with a 70% improvement in anti-fouling efficiency) to titrate EDTA at pH 4.5 to detect the Cu 2+ concentration of 0.098 ppm (recovery rate 98%).

[0088] 5. Fault handling: When a pipeline crystallization blockage is detected, the system automatically switches to the standby flow path and alarms.

[0089] Technical advantages:

[0090] Equipment durability in a strong corrosion environment;

[0091] Density adaptive compensation reduces dilution error by 83%;

[0092] The electrode anti-fouling technology extends the probe life by 3 times.

[0093] Example 3: Food detection - Determination of dairy product additive content

[0094] Application scenario: Dairy factories need to detect the potassium sorbate preservative content in yogurt. The samples have a high viscosity and need to meet FDA detection specifications.

[0095] Operation process:

[0096] 1. High-viscosity treatment: The robotic arm (6) switches to the vacuum adsorption mode to grab a 5 g viscous yogurt sample, and the weighing error ≤ 0.2 mg;

[0097] 2. Temperature-controlled dilution: The liquid cooling pipeline (7) maintains the dilution liquid (deionized water) at 25 ± 0.3 °C to prevent the temperature from affecting the solubility of potassium sorbate;

[0098] 3. Efficient mixing: The main stirring rod (402) of the multi-axis stirring mechanism (8) rotates at 1200 rpm, and the auxiliary eddy current generator generates a vertical eddy current, completing the mixing within 15 seconds (impedance meets the standard);

[0099] 4. Rapid titration: Using a silver electrode to titrate silver nitrate in a micro-scale cell (306), and the spiral flow guide groove shortens the reaction time to 42 seconds (the conventional cell requires 110 seconds);

[0100] 5. Data compliance: The detected data (0.09%) is stored on the blockchain and automatically uploaded to the LIMS system, meeting the requirements of 21 CFR Part 11.

[0101] Core values:

[0102] Non-destructive transfer of high-viscosity samples (success rate 99.9%);

[0103] The mixing efficiency is increased by 40% (compared with traditional magnetic stirring).

[0104]

[0105] The above embodiments prove that the device can still maintain high precision (error < 1%), high efficiency (processing volume > 12 samples / hour) and high reliability (failure rate < 0.5 times per thousand samples) in complex scenarios, significantly superior to traditional manual or semi-automatic devices.

[0106] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concentration measuring device with automatic weighing and automatic dilution functions, characterized in that, Includes the following modules: Left reagent bottle component: comprising a reagent bottle, a reagent feed conduit and a sealing piston, wherein the reagent bottle is sealed and stores a plurality of reagents through the sealing piston, and the reagent feed conduit is connected to the peristaltic pump system to deliver the reagents to the automatic potentiometric titration system as required; Automatic potentiometric titration system: comprising an automatic potentiometric titrator, a fixing module and a chassis, wherein the automatic potentiometric titrator is fixed on the chassis through the fixing module, and is used to monitor the solution concentration in real time and determine the titration end point by the potentiometric method; Peristaltic pump system: including a power pump, a top pressure piston, a liquid adding unit and a titration unit. The power pump drives the top pressure piston to achieve reciprocating motion. The liquid adding unit and the titration unit respectively complete the reagent delivery, sample dilution and titration operations through the reciprocating motion of the piston; Automatic weighing system: including an electronic balance, a sample tray and a mechanical arm, wherein the mechanical arm is used to grab the sample tray to the electronic balance for weighing, and transfer it to the right sample dilution system to complete dilution and then send it back to the titration position; Right sample dilution system: It includes a quantitative liquid dosing device, a diluent storage bottle and a stirring device. The quantitative liquid dosing device accurately measures the diluent according to the preset dilution multiple, and the stirring device dynamically mixes the diluent and the sample through a stirring rod; Central control unit: Integrates weighing feedback module, dilution multiple calculation module and titration endpoint determination algorithm to achieve closed-loop control of the entire process from weighing, dilution to titration.

2. The concentration measuring device with automatic weighing and automatic dilution functions according to claim 1, characterized in that, The left reagent bottle component and the right sample dilution system are symmetrically distributed to form a cross-contamination prevention partition structure, wherein: A one-way valve is built into the reagent feed conduit of the left reagent bottle component to prevent the reagent from flowing back; a liquid cooling pipeline is provided between the quantitative liquid adder of the right sample dilution system and the diluent storage bottle to maintain the diluent temperature constant within the range of ±0.5°C.

3. The concentration measuring device with automatic weighing and automatic dilution functions according to claim 1, wherein, The top pressure piston of the peristaltic pump system adopts a split design, including: a piston driving part, which is connected to the power pump through a magnetic coupling transmission to achieve contactless power transmission; a piston actuator, with a built-in pressure sensor, which monitors the pipeline pressure in real time and feeds back to the central control unit, and dynamically adjusts the piston movement speed to maintain flow stability (fluctuation ≤±0.8%).

4. A concentration measuring device with automatic weighing and automatic dilution functions according to claim 1, characterized in that, The end effector of the robotic arm adopts a composite structure of vacuum adsorption and mechanical grippers, which is suitable for sample trays of different specifications; the motion path planning module dynamically optimizes the movement trajectory based on the sample transfer priority and the robotic arm load, shortening the single transfer time to ≤3 seconds; it is equipped with a visual positioning component, which coordinates the position of the sample tray through a laser rangefinder and a CCD camera, with a positioning accuracy of ±0.05mm.

5. The concentration measuring device with automatic weighing and automatic dilution functions according to claim 1, characterized in that, The stirring device includes a multi-axis linkage stirring mechanism, which is composed of a main stirring rod and an auxiliary vortex generator. When the main stirring rod performs a circular motion, the auxiliary vortex generator generates a vertical vortex; an impedance monitoring unit detects the impedance change of the mixed liquid in real time, and determines that the mixing is uniform when the impedance fluctuation rate is ≤1%.

6. The concentration measuring device with automatic weighing and automatic dilution functions according to claim 1, characterized in that, The central control unit includes: a dynamic dilution compensation algorithm, which automatically corrects the dilution multiple according to the deviation between the weighing result and the target concentration and feeds back to the quantitative liquid dosing device; Titration endpoint prediction model, integrating potential mutation detection and convolutional neural network (CNN), terminates titration 100 ms before reaching the theoretical endpoint to reduce over-titration error; Fault self-recovery module, when detecting robotic arm positioning deviation or pipeline blockage, automatically switches to the standby flow path and re-initializes the system.

7. The concentration measuring device with automatic weighing and automatic dilution functions according to claim 1, characterized in that, The automatic potentiometric titrator further includes: Three-electrode integrated probe, integrating pH glass electrode, reference electrode and temperature compensation electrode, with a nano anti-fouling coating on the probe surface to reduce protein adsorption; Micro-liter titration cell, with an effective volume of 0.5 - 2 ml, and spiral flow guide grooves are provided on the inner wall of the cell.

8. The concentration measuring device with automatic weighing and automatic dilution functions according to claim 1, characterized in that, It also includes: Environmental isolation chamber, covering the left reagent bottle component and the right sample dilution system, maintaining positive pressure and humidity ≤30% RH; Waste liquid recovery module, collecting waste reagents and cleaning solutions by negative pressure adsorption, and the waste liquid separation unit stores waste liquids by pH value classification.

9. A control method for a concentration measuring device with automatic weighing and automatic dilution functions according to any one of claims 1-8, characterized in that, It includes the following steps: The sample tray is transferred to the electronic balance by the robotic arm, and the weighing data is uploaded to the central control unit in real time; calculates the dilution multiple according to the target concentration, controls the quantitative dispenser to inject the diluent, and synchronously starts the multi-axis linkage stirring mechanism; After dilution is completed, the robotic arm transfers the sample to the micro-liter titration cell and starts the top-pressure piston for titration; Collects potential signals using the three-electrode integrated probe, determines the endpoint through the titration endpoint prediction model and generates a test report; Executes the automatic cleaning program of the environmental isolation chamber and classifies and processes waste liquids through the waste liquid recovery module.

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