PH value adjusting detector and adjusting detection method

Abstract

The invention discloses a PH value adjusting detector and an adjusting detection method, and belongs to the technical field of water sample detection equipment.The PH value adjusting detector comprises a box body, a mounting base is fixed to one end of the box body through bolts, an adjusting frame is rotationally connected to the surface of the mounting base, a control terminal is fixed to the surface of the adjusting frame through bolts, and an electrode box is arranged at the other end of the box body; an electrode assembly used for storing a plurality of sets of electrodes is installed in an inner cavity of the electrode box and connected with a control terminal through a signal line, a box door is slidably connected to the surface of the box body, an injection pump array module is installed in an inner cavity of the box body and comprises a module support, and the module support is fixed to an inner cavity of the box door through bolts. By means of the scheme, the situation that multiple sets of equipment or complex multi-way valve switching is needed in a multi-container scene is avoided, the detection equipment can be used in multiple containers at the same time, the occupied space is reduced, and wiring and maintenance burdens are reduced.

Description

Technical Field

[0001] This invention relates to the field of water sample testing equipment technology, specifically to a pH value adjustment detector and adjustment detection method. Background Technology

[0002] In applications such as laboratory analysis, process development, solution preparation, and biochemical reaction control, solution pH is a core process parameter. In scenarios involving multiple samples in parallel, batch preparation, or high-throughput development, it is often necessary to monitor and adjust the pH of multiple solutions simultaneously. Traditional manual monitoring and adjustment methods rely on portable pH meters for measurement and manual addition of acid or alkali using burettes or pumps. This method is labor-intensive, the results are greatly affected by the operator's experience, and the adjustment data cannot be fully traced.

[0003] With the development of automation, single-channel pH control terminals or titrators have emerged. These devices monitor the pH of the solution in real time using a single pH electrode and control the metering pump to add acid or alkali according to a certain dosage. Such devices can achieve closed-loop control on a single container. When multiple solutions need to be processed simultaneously, the common solution is to equip each container with a control terminal or titrator, or to use complex multi-way valve switching to enable one pump or one electrode to serve multiple containers. This results in multiple sets of equipment or complex multi-way valve switching for multi-container scenarios, increasing the burden of space, wiring, and maintenance. Therefore, we need to propose a pH value adjustment and detection instrument and adjustment detection method. Summary of the Invention

[0004] The purpose of this invention is to provide a pH value adjustment and detection instrument and method. By combining the syringe pump array module and the electrode assembly, it is possible to add acid and alkali to multiple containers and monitor the pH value of multiple containers. This avoids the need for multiple stand-alone solutions, simplifies wiring operations, and reduces the footprint. Through the cooperation of the door and the cabinet, the cabinet can be opened directly to disassemble the metering and dispensing components on the module support, thereby reducing maintenance complexity and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pH value adjustment detector and adjustment detection method, comprising a housing, a mounting base bolted to one end of the housing, an adjustable bracket with adjustable angle and length rotatably connected to the surface of the mounting base, a control terminal bolted to the surface of the adjustable bracket, an electrode box provided at the other end of the housing, an electrode assembly for storing several sets of electrodes installed in the inner cavity of the electrode box, the electrode assembly being connected to the control terminal via a signal line, a door slidably connected to the surface of the housing, a U-shaped push rod bolted to the surface of the door, an injection pump array module installed in the inner cavity of the housing, the injection pump array module including a module bracket bolted to the inner cavity of the door, and several sets of metering and dispensing components for liquid addition distributed in an array on the surface of the module bracket.

[0006] Preferably, the metering and dispensing assembly includes a mounting port on the surface of the module support and a mounting bracket located inside the mounting port. The surface of the mounting bracket is slidably connected to the inner cavity of the mounting port. The mounting bracket is bolted to the surface of the module support. A syringe pump body is bolted to the surface of the mounting bracket. The outlet of the syringe pump body is connected to a one-way valve. The delivery port of the one-way valve is connected to a connecting pipe.

[0007] Preferably, the top end of the module bracket is bolted to a bracket one, the surface of the bracket one is bolted to a circuit board one for controlling the injection pump to add liquid, the bottom end of the module bracket is bolted to a bracket two, and the top end of the bracket two is bolted to a circuit board two for connecting to a control terminal.

[0008] Preferably, the adjustment frame includes a connecting rod, which is welded and fixed to the surface of the mounting base. An extension plate is rotatably connected to the other end of the connecting rod, and a connecting column is welded and fixed to the other end of the extension plate. A support frame is provided at the other end of the connecting column, and the inner cavity of the support frame is rotatably connected to the surface of the connecting column. A movable frame is rotatably connected to the other end of the support frame, and a connecting seat is rotatably connected to the inner cavity of the movable frame. The surface of the connecting seat is bolted to the surface of the control terminal.

[0009] Preferably, the surface of the door has a rectangular opening, and an observation window is glued and fixed inside the rectangular opening. The observation window is transparent.

[0010] Preferably, the electrode assembly includes a positioning bracket, which is bolted to the inner cavity of the electrode box. The positioning bracket is arranged in a ring shape, and its surface is provided with several sets of fixing structures for fixing the electrode. The inner cavity of the fixing structure is connected to a pH electrode, and the top end of the pH electrode is connected to a circuit board two via a signal line.

[0011] Preferably, the fixing structure includes an installation port on the surface of the positioning bracket and an installation plate above the installation port. The surface of the installation plate is integrally formed with a locking nut. The inner cavity of the locking nut is threadedly connected to the surface of the pH electrode. A fixing plate is welded to one end of the installation plate, and a fixing tube is provided at the other end of the fixing plate. The fixing tube is welded to the surface of the positioning bracket, and the inner cavity of the fixing tube engages with the surface of the fixing plate.

[0012] Preferably, a support plate is welded and fixed to the top of the positioning bracket, and the surface of the support plate is provided with several sets of arc-shaped grooves for supporting the signal lines. Several sets of positioning tubes are integrally formed at the bottom of the positioning bracket, and the inner cavity of the positioning tubes is movably connected to the bottom of the PH electrode.

[0013] On the other hand, the present invention proposes an adjustment detection method for a pH value adjustment detector, comprising: S1: Immerse the multiple pH electrodes in the electrode assembly into the container of the solution to be tested, and at the same time place the connecting tube of the metering liquid dispensing component in the syringe pump array module into the corresponding container. S2: Collect the pH value signal of the solution in each container through the electrode assembly, and transmit the pH value signal to the control terminal; S3: Based on the control terminal, the pH signal is filtered, temperature compensated, and analog-to-digital converted to obtain stable and accurate pH data. Temperature compensation is calculated using the Nernst equation. Where E is the measured potential, E 0 Here, is the standard potential, R is the gas constant, T is the absolute temperature, and F is the Faraday constant; S4: Compare the pH value data with the preset target pH range. When the pH value data exceeds the preset target pH range, calculate the amount of acid or alkali solution to be added. The calculation formula is as follows: V add K represents the amount of solution to be added. p and K i These are the proportional and integral coefficients, respectively. S5: Control the metering and dispensing components to inject acid or alkali solutions into the corresponding containers according to the required amount of acid or alkali solution, complete the pH adjustment, and cycle through S2-S5 until the pH data stabilizes within the preset target pH range.

[0014] Preferably, the filtering process in step S3 employs a combination of median filtering and exponential moving average, specifically as follows: , where y k x is the current output value. k y is the current input value. k-1 The output value is the value at the previous time step, and α is the smoothing coefficient, which ranges from 0.1 to 0.3.

[0015] Preferably, during step S5, the rate of pH change during the liquid addition process is monitored in real time. An abnormal state is determined and the liquid addition is terminated when the following conditions are met: , where pH t Let be the pH value at time t. For time intervals, V is the threshold for the rate of change. cumulative V represents the cumulative amount of liquid added. threshold This is the preset maximum liquid addition threshold.

[0016] Preferably, the method further includes: when simultaneously processing pH adjustment of multiple containers, using a time-slice round-robin scheduling algorithm to allocate processing resources of the control terminal, wherein the processing time slice length of each container is proportional to the degree to which its pH value deviates from the target value, and the calculation formula is: T i The time slice T allocated to the i-th container base The base time slice length, β is the adjustment coefficient, and pH max and pH min These are the upper and lower limits of the measurable pH range, respectively.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a pH value adjustment detector and adjustment detection method. Through the configuration of the syringe pump array module, acid or alkali can be added to several containers via several sets of metering and dispensing components. Simultaneously, several sets of electrodes on the electrode assembly monitor several containers at the same time, avoiding multiple single-unit solutions and reducing the footprint. The enclosure design allows for direct opening of the enclosure by pushing the door upwards, facilitating maintenance of the internal syringe pump array module and providing convenience for its assembly and disassembly. This solution avoids the need for multiple sets of equipment or complex multi-way valve switching in multi-container scenarios, enabling the detection equipment to be used on multiple containers simultaneously, reducing footprint, wiring, and maintenance burden.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3This is a schematic diagram of the structure of the adjustment frame of the present invention; Figure 4 This is a schematic diagram of the structure of the electrode box of the present invention with the electrode box open; Figure 5 This is a schematic diagram of the electrode assembly of the present invention; Figure 6 This is a schematic diagram of the structure of the present invention with the door open; Figure 7 This is a schematic diagram of the structure of the module bracket of the present invention; Figure 8 This is a side view of the structural diagram of the module bracket of the present invention.

[0020] In the diagram: 1. Box body; 2. Electrode box; 3. Electrode assembly; 31. Positioning bracket; 32. pH electrode; 33. Mounting plate; 34. Locking nut; 35. Fixing plate; 36. Fixing tube; 4. Mounting seat; 5. Adjusting frame; 51. Connecting rod; 52. Extension plate; 53. Connecting column; 54. Support frame; 55. Movable frame; 56. Connecting seat; 6. Control terminal; 7. Box door; 8. U-shaped push rod; 9. Module bracket; 10. Metering and dispensing assembly; 101. Mounting frame; 102. Injection pump body; 103. One-way valve; 104. Bracket one; 105. Circuit board one; 106. Bracket two; 107. Circuit board two; 11. Observation window; 12. Support plate; 13. Arc groove; 14. Positioning tube. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-8 This invention provides a technical solution: a pH value adjustment detector and adjustment detection method, including a housing 1, a mounting base 4 bolted to one end of the housing 1, an adjustable angle and length adjustment frame 5 rotatably connected to the surface of the mounting base 4, a control terminal 6 bolted to the surface of the adjustment frame 5, an electrode box 2 provided at the other end of the housing 1, an electrode assembly 3 for storing several sets of electrodes installed in the inner cavity of the electrode box 2, the electrode assembly 3 connected to the control terminal 6 via a signal line, a door 7 slidably connected to the surface of the housing 1, a U-shaped push rod 8 bolted to the surface of the door 7, an injection pump array module installed in the inner cavity of the housing 1, the injection pump array module including a module bracket 9, the module bracket 9 bolted to the inner cavity of the door 7, and several sets of metering and dispensing components 10 for adding liquid distributed in an array on the surface of the module bracket 9; In use, first, power the power cord of the detector through the power supply equipment or power supply system, then open the electrode box 2, and place several sets of electrodes on the electrode assembly 3 into several sets of containers that need to be monitored. Place one end of several sets of metering liquid addition assemblies 10 into the corresponding containers. If the operator starts the corresponding metering liquid addition assembly 10 through the operation control terminal 6, the metering liquid addition assembly 10 will add acid or alkali to the container to adjust the pH value of the water sample. The change value of the water sample in the container sensed by the electrode is transmitted to the control terminal 6 through the signal line for display, and the operator obtains the water sample monitoring value. Furthermore, through the cooperation of electrode assembly 3, injection pump array module and control terminal 6, the integrated setup of multiple container testing tools is realized, avoiding multiple single-machine solutions, simplifying the wiring operation in the testing instrument, and thus reducing the footprint.

[0023] Preferred, such as Figure 7 As shown, the metering and dispensing assembly 10 includes a mounting port on the surface of the module support 9 and a mounting bracket 101 located inside the mounting port. The surface of the mounting bracket 101 is slidably connected to the inner cavity of the mounting port. The mounting bracket 101 is bolted to the surface of the module support 9. The surface of the mounting bracket 101 is bolted to a syringe pump body 102. The outlet of the syringe pump body 102 is connected to a one-way valve 103. The delivery port of the one-way valve 103 is connected to a connecting pipe. When adjusting the pH value, the two sets of connecting pipes are placed into the container. The operator starts the syringe pump body 102 through the operation control terminal 6. The syringe pump body 102 injects liquid into the one-way valve 103. The liquid enters the water sample in the container through the connecting pipe. The addition of acid or alkali is achieved by controlling the syringe pump body 102. The connecting pipe is made of corrosion-resistant hose. The material of the connecting pipe can be one of PTFE / PFA / FEP, PEEK, PVDF, ETFE and their equivalent corrosion-resistant materials.

[0024] Furthermore, such as Figure 8 As shown, bracket 104 is bolted to the top of module bracket 9, and circuit board 105 for controlling the injection pump to add liquid is bolted to the surface of bracket 104. Bracket 2 106 is bolted to the bottom of module bracket 9, and circuit board 2 107 for connecting to control terminal 6 is bolted to the top of bracket 2 106. When operating control terminal 6, control terminal 6 sends a signal to circuit board 2 107 through signal line, and circuit board 2 107 transmits a signal to circuit board 105 through signal line, so that circuit board 105 controls injection pump body 102 to open or close through signal line.

[0025] Preferred, such as Figure 3As shown, the adjustment frame 5 includes a connecting rod 51, which is welded and fixed to the surface of the mounting base 4. The other end of the connecting rod 51 is rotatably connected to an extension plate 52, and the other end of the extension plate 52 is welded and fixed to a connecting column 53. The other end of the connecting column 53 is provided with a support frame 54, the inner cavity of the support frame 54 is rotatably connected to the surface of the connecting column 53, and the other end of the support frame 54 is rotatably connected to a movable frame 55. The inner cavity of the movable frame 55 is rotatably connected to a connecting seat 56, and the surface of the connecting seat 56 is bolted to the surface of the control terminal 6. Through the cooperation of the connecting rod 51, extension plate 52, connecting column 53, support frame 54, movable frame 55, and connecting seat 56, a simple adjustment frame 5 can be assembled to cooperate with the control terminal 6 for angle and direction adjustment. The connecting column 53, support frame 54, movable frame 55, and connecting seat 56 are all connected by nuts and bolts.

[0026] In addition, such as Figure 6 As shown, a rectangular opening is provided on the surface of the door 7, and an observation window 11 is glued and fixed inside the rectangular opening. The observation window 11 is transparent. Through the setting of the observation window 11, the operator can observe the working process of the injection pump body 102 from outside the box 1. Pushing the door 7 upward can open the box 1, so that the door 7 position of the box 1 forms a visual maintenance window, which is convenient for replacing pipelines and checking for leaks.

[0027] Specifically, such as Figure 5 As shown, the electrode assembly 3 includes a positioning bracket 31, which is bolted to the inner cavity of the electrode box 2. The positioning bracket 31 is arranged in a ring shape, and the surface of the positioning bracket 31 is provided with several sets of fixing structures for fixing the electrodes. The inner cavity of the fixing structure is connected to the pH electrode 32. The top of the pH electrode 32 is connected to the second circuit board 107 through a signal line. The fixing structure can help fix the pH electrode 32 on the positioning bracket 31, thereby improving the stability of the pH electrode 32 in the positioning bracket 31. When the electrode box 2 is opened, one set of pH electrodes 32 is taken out and placed in the water sample in the container. The pH value sensed by the pH electrode 32 is transmitted to the second circuit board 107 through the signal line. The second circuit board 107 then transmits the value to the control terminal 6 for display through the signal line.

[0028] Preferably, the fixing structure includes an installation port on the surface of the positioning bracket 31 and an installation plate 33 located above the installation port. A locking nut 34 is integrally formed on the surface of the installation plate 33. The inner cavity of the locking nut 34 is threadedly connected to the surface of the PH electrode 32. A fixing plate 35 is welded and fixed to one end of the installation plate 33. A fixing tube 36 is provided at the other end of the fixing plate 35. The fixing tube 36 is welded and fixed to the surface of the positioning bracket 31. The inner cavity of the fixing tube 36 is engaged with the surface of the fixing plate 35. Through the engagement of the fixing tube 36 and the fixing plate 35, the fixing tube 36 and the fixing plate 35 can be disassembled, allowing the installation plate 33 to be removed from the positioning bracket 31. This enables modular disassembly of the fixing structure. The PH electrode 32 is then inserted into the inner cavity of the locking nut 34 and tightened, so that the surface of the PH electrode 32 is threadedly connected to the inner cavity of the locking nut 34, thus fixing the PH electrode 32.

[0029] In addition, a support plate 12 is welded and fixed to the top of the positioning bracket 31. The surface of the support plate 12 is provided with several sets of arc-shaped grooves 13 for supporting the signal lines. Several sets of positioning tubes 14 are integrally formed at the bottom of the positioning bracket 31. The inner cavity of the positioning tube 14 is movably connected to the bottom of the PH electrode 32. The arc-shaped grooves 13 can isolate and support the signal lines of the PH electrode 32, preventing the signal lines from scattering in the electrode box 2. The positioning tubes 14 can support the bottom of the PH electrode 32, thereby constraining the bottom of the PH electrode 32 and improving the stability of the PH electrode 32 in the electrode box 2.

[0030] In practical use: First, power the power cord of the pH value adjustment and detection instrument through the power supply system or power supply equipment. Open the electrode box 2, take out the first set of pH electrodes 32 on the positioning bracket 31, and put them into the water sample in the first container. Then, put the two sets of connecting tubes into the first container. The operator operates the control terminal 6. The control terminal 6 sends a signal to the second circuit board 107 through the signal line. The second circuit board 107 transmits the signal to the first circuit board 105 through the signal line. The first circuit board 105 sends a signal to the two sets of injection pump bodies 102 through the signal line, so that the injection pump bodies 102 start and inject liquid into the connecting tube through the one-way valve 103. This can realize the addition of acid or alkali to the container. The pH value of the water sample in the container changes, which is sensed by the pH electrode 32. The pH electrode 32 transmits the value to the second circuit board 107 through the signal line. The second circuit board 107 transmits the value to the control terminal 6 through the signal line for display. The operator can perform the liquid addition operation again according to the displayed pH value. When it is necessary to adjust the pH value of water samples in the second or third set of containers simultaneously, the above operation can be repeated. Take the appropriate second or third set of pH electrodes 32 and insert them into the corresponding container for monitoring. At the same time, put the connecting tube into the container to add liquid and adjust the pH value. This solution avoids the need for multiple sets of equipment or complex multi-way valve switching in multi-container scenarios, allowing the detection equipment to be used in multiple containers at the same time, reducing the footprint and the burden of wiring and maintenance.

[0031] The control terminal includes: a signal acquisition and conditioning unit, an A / D conversion unit, a microprocessor unit for execution drive and I / O unit, a storage and clock unit, a communication interface unit, and a power supply and isolation unit; among which, the signal acquisition and conditioning unit has high input impedance buffering and shielding drive functions, and buffers, filters and electrically shifts the mV-level high impedance signal output by the pH electrode before sending it to the A / D conversion unit; The microprocessor unit calculates the pH value based on calibration parameters and temperature compensation model, and outputs displacement / pulse control commands for the metering and dispensing components and control commands for the valve components. At the same time, it records timestamp-pH and dispensing event data by channel. Example hardware model: The microprocessor can be an STM32F4 or STM32H7 series or an equivalent ARM MCU; the A / D conversion unit can be a 16-24 bit multi-channel ADC (such as ADS1115, ADS1120, ADS1220 or AD7793, etc.). High input impedance operational amplifiers can be OPA333, AD8606 or LMP7721, etc.; communication interfaces can be RS-485 transceivers (such as MAX3485 or SN65HVD series) or Ethernet PHYs (such as LAN8720 or DP83848). The above models are only examples and do not constitute limitations.

[0032] The specific working principle and algorithm of the control terminal Signal Acquisition and Conditioning: The pH electrode outputs a high-impedance, mV-level potential signal (with pH 7 as the zero point, showing positive and negative changes on both the acidic and alkaline sides). The signal acquisition and conditioning unit of the control terminal uses a high-input-impedance buffered operational amplifier to isolate and drive the electrode signal. It can be configured with shielded drive (Guard), RC low-pass filter, surge / static protection and analog ground isolation to ensure that the signal falls stably within the A / D range. The A / D conversion unit samples at a fixed period (e.g., 1Hz to 10Hz) to obtain the potential value of each channel.

[0033] Digital filtering and stability criteria: Anti-glitch processing and smoothing of potential values, for example, using median filtering (window 3-5) + exponential moving average; and setting stability criteria to determine whether the readings can be used for calibration or control.

[0034] Temperature compensation: When the device includes a temperature sensor (e.g., NTC or PT100), the control terminal corrects the slope for temperature based on the Nernst relationship.

[0035] Closed-loop liquid addition control strategy: Set target ranges for each channel, as well as minimum / maximum liquid addition volume per cycle, mixing waiting time, maximum number of cycles, and maximum cumulative liquid addition volume.

[0036] Fault diagnosis and safety interlock: The control terminal can determine abnormalities such as electrode disconnection / short circuit (potential out of range), reading drift (long-term unidirectional change), liquid shortage / blockage (cumulative liquid volume reaches the upper limit but pH has no effective response), and door interlock (liquid addition is prohibited when the door is open); when an abnormality occurs, liquid addition to the channel is stopped and alarms and logs are reported to the display / operation terminal.

[0037] The workflow of the control terminal in conjunction with other components (example state machine): Initialization: After power-on, the control terminal performs self-tests on each channel's A / D converter, communication interface, pump / valve drive, storage, and clock; reads historical calibration parameters and control parameters for each channel; establishes communication with the display / operation terminal and reports the equipment status.

[0038] Calibration: The user initiates calibration on the control terminal. The control terminal prompts the user to add buffer solution sequentially and collect stable potentials; calculates and saves slope / zero point / temperature parameters and binds them to the channels; calibration results can be sent back to the terminal for display and archiving.

[0039] Operation: The control terminal sends the target range and control parameters for each channel; the control terminal enters the monitoring state and cyclically executes sampling-conversion-stability judgment-decision; if liquid needs to be added, it outputs step / servo displacement commands (or pump running time / pulse count) to the metering liquid addition component and links the valve component to switch to the corresponding acid / alkali path; the liquid addition end maintains a fixed spatial relationship with the electrode under the limiting constraint of the positioning bracket, improving response consistency.

[0040] On the other hand, the present invention proposes an adjustment detection method for a pH value adjustment detector, comprising: S1: Immerse multiple pH electrodes from the electrode assembly into the solution container to be tested, and simultaneously place the connecting tube of the metering and dispensing component from the syringe pump array module into the corresponding container; synchronize and accurately position the connecting tubes of the electrode assembly and the syringe pump array module to ensure that the measurement point and the dispensing point coincide in space, eliminating local concentration gradient errors caused by positional offset; multi-channel parallel arrangement enables synchronous initialization of multiple samples, establishing a physical basis for subsequent closed-loop adjustment and avoiding cross-contamination.

[0041] S2: Collect pH value signals of solutions in each container through electrode assembly and transmit the pH value signals to the control terminal; collect (10Hz) pH value signals through electrode assembly and transmit the pH value signals to the control terminal in real time to build a millisecond-level dynamic monitoring link; shielded transmission design improves the signal-to-noise ratio, effectively suppresses electromagnetic interference, ensures the integrity of the original data, and provides a highly reliable input source.

[0042] S3: Based on the control terminal, the pH signal is filtered, temperature compensated, and analog-to-digital converted to obtain stable and accurate pH data. Temperature compensation is calculated using the Nernst equation. Where E is the measured potential, E 0 Here, is the standard potential, R is the gas constant, T is the absolute temperature, and F is the Faraday constant; Achieving interference-resistant, high-precision, and temperature-adaptive pH data generation. By sequentially performing filtering (suppressing impulse noise), Nernst equation temperature compensation (eliminating thermoelectric potential drift), and analog-to-digital conversion (ensuring digital domain computational accuracy) on the pH signal, the original analog signal is transformed into stable, reproducible, and electrochemically sound digital pH data.

[0043] Furthermore, the filtering process employs a combination of median filtering and exponential moving average, specifically as follows: , where y k x is the current output value. k y is the current input value. k-1 The output value is the value at the previous time step, and α is the smoothing coefficient, which ranges from 0.1 to 0.3.

[0044] A cascaded filtering structure combining median filtering and exponential moving average is introduced to synergistically leverage the advantages of both: median filtering effectively eliminates spike pulse interference caused by poor electrode contact and bubble adhesion; exponential moving average smooths out high-frequency random noise while preserving the true pH change trend. (Setting...) Balancing response speed and smoothness, actual tests show that this combined filtering method ensures the timing accuracy of subsequent temperature compensation and PID calculations compared to a single method.

[0045] S4: Compare the pH value data with the preset target pH range. When the pH value data exceeds the preset target pH range, calculate the amount of acid or alkali solution to be added. The calculation formula is as follows: V add K represents the amount of solution to be added. p and K i These are the proportional and integral coefficients, respectively. The proportional term is used to achieve rapid initial adjustment, while the integral term is used to eliminate static deviation, thus overcoming the shortcomings of simple proportional control being prone to oscillation and pure open-loop liquid addition failing to converge.

[0046] S5: Control the metering and dispensing component to inject acid or alkali solution into the corresponding container according to the required amount, complete the pH adjustment, and cycle through S2-S5 until the pH data stabilizes within the preset target pH range; achieving precise execution and self-converging regulation under closed-loop drive. Control the metering and dispensing component to strictly inject the required amount of acid or alkali solution, and force the cycle through S2–S5, forming a complete negative feedback loop of sensing, decision-making, execution, and re-sensing.

[0047] Specifically, during the execution of S5, the rate of pH change during the liquid addition process is monitored in real time. When the following conditions are met, an abnormal state is determined and the liquid addition is terminated: , where pH t Let be the pH value at time t. For time intervals, V is the threshold for the rate of change. cumulative V represents the cumulative amount of liquid added. threshold This is the preset maximum liquid addition threshold.

[0048] The system incorporates a dual-threshold anomaly detection mechanism during execution. By monitoring two conditions in real time—hysteresis and excessive liquid addition—it can accurately identify typical failure scenarios, such as electrode passivation failure (no pH response), tubing blockage (liquid not entering the solution), and buffer capacity depletion (continuous liquid addition but unchanged pH). Once triggered, the liquid addition is immediately terminated and an alarm is triggered to prevent reagent abuse, container overflow, or system collapse, significantly improving system robustness and operational safety.

[0049] In another embodiment, the method further includes: when simultaneously processing the pH adjustment of multiple containers, a time-slice round-robin scheduling algorithm is used to allocate the processing resources of the control terminal, wherein the processing time slice length of each container is proportional to the degree to which its pH value deviates from the target value, and the calculation formula is: T i The time slice T allocated to the i-th container base The base time slice length, β is the adjustment coefficient, and pH max and pH min These are the upper and lower limits of the measurable pH range, respectively.

[0050] Achieve dynamic matching of resource allocation and control urgency: the greater the pH deviation, the longer the allocation time slice, ensuring that critical channels receive priority computing and response resources.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pH value adjustment and detection instrument, characterized in that, include: The enclosure, the electrode box, and the electrode assembly for storing several sets of electrodes; One end of the housing is connected to a mounting base, and the surface of the mounting base is rotatably connected to an adjustment frame that can adjust the angle and length. The surface of the adjustment frame is connected to a control terminal. The electrode box is located at the other end of the box body. The inner cavity of the electrode box is connected to the electrode assembly, and the electrode assembly is connected to the control terminal through a signal line. The surface of the box is slidably connected to a door, and the surface of the door is connected to a U-shaped push rod. An injection pump array module is installed in the inner cavity of the box. The syringe pump array module includes a module bracket connected to the inner cavity of the box door, and the surface of the module bracket is arrayed with several sets of metering and dispensing components for dispensing liquid.

2. The pH value adjustment and detection instrument according to claim 1, characterized in that: The metering and dispensing assembly includes a mounting port on the surface of the module support and a mounting bracket located inside the mounting port. The surface of the mounting bracket is slidably connected to the inner cavity of the mounting port. The mounting bracket is connected to the surface of the module support. The surface of the mounting bracket is connected to the body of the injection pump. The outlet of the injection pump body is connected to a one-way valve. The top of the module bracket is connected to bracket one, and the surface of bracket one is connected to circuit board one for controlling the injection pump to add liquid. The bottom of the module bracket is connected to bracket two, and the top of bracket two is connected to circuit board two for connecting to the control terminal.

3. The pH value adjustment and detection instrument according to claim 1, characterized in that: The adjustment frame includes a connecting rod connected to the surface of the mounting base. The other end of the connecting rod is rotatably connected to an extension plate. The other end of the extension plate is connected to a connecting column. The other end of the connecting column is provided with a support frame. The inner cavity of the support frame is rotatably connected to the surface of the connecting column. The other end of the support frame is rotatably connected to a movable frame. The inner cavity of the movable frame is rotatably connected to a connecting seat. The surface of the connecting seat is connected to the surface of the control terminal.

4. The pH value adjustment and detection instrument according to claim 1, characterized in that: The electrode assembly includes a positioning bracket connected to the inner cavity of the electrode box. The positioning bracket is arranged in a ring shape, and the surface of the positioning bracket is provided with several sets of fixing structures for fixing the electrode. The inner cavity of the fixing structure is connected to a pH electrode, and the top of the pH electrode is connected to a circuit board 2 via a signal line.

5. A pH value adjustment and detection instrument according to claim 4, characterized in that: The fixing structure includes an installation port on the surface of the positioning bracket and an installation plate above the installation port. The surface of the installation plate is integrally formed with a locking nut. The inner cavity of the locking nut is threadedly connected to the surface of the PH electrode. One end of the installation plate is connected to a fixing plate, and the other end of the fixing plate is provided with a fixing tube. The fixing tube is connected to the surface of the positioning bracket, and the inner cavity of the fixing tube is engaged with the surface of the fixing plate.

6. A pH value adjustment and detection instrument according to claim 5, characterized in that: The top of the positioning bracket is connected to a support plate, and the surface of the support plate is provided with several sets of arc-shaped grooves for supporting the signal lines. The bottom of the positioning bracket is integrally formed with several sets of positioning tubes, and the inner cavity of the positioning tubes is movably connected to the bottom of the PH electrode.

7. A method for adjusting and detecting pH value using a pH value adjustment detector according to any one of claims 1-6, characterized in that, include: S1: Immerse the multiple pH electrodes in the electrode assembly into the container of the solution to be tested, and at the same time place the connecting tube of the metering liquid dispensing component in the syringe pump array module into the corresponding container. S2: Collect the pH value signal of the solution in each container through the electrode assembly, and transmit the pH value signal to the control terminal; S3: Based on the control terminal, the pH signal is filtered, temperature compensated, and analog-to-digital converted to obtain stable and accurate pH data. Temperature compensation is calculated using the Nernst equation. Where E is the measured potential, E 0 Here, is the standard potential, R is the gas constant, T is the absolute temperature, and F is the Faraday constant; S4: Compare the pH value data with the preset target pH range. When the pH value data exceeds the preset target pH range, calculate the amount of acid or alkali solution to be added. The calculation formula is as follows: V add K represents the amount of solution to be added. p and K i These are the proportional and integral coefficients, respectively. S5: Control the metering and dispensing components to inject acid or alkali solutions into the corresponding containers according to the required amount of acid or alkali solution, complete the pH adjustment, and cycle through S2-S5 until the pH data stabilizes within the preset target pH range.

8. The adjustment detection method according to claim 7, characterized in that: The filtering process in step S3 uses a combination of median filtering and exponential moving average, specifically: , where y k x is the current output value. k y is the current input value. k-1 The output value is the value at the previous time step, and α is the smoothing coefficient, which ranges from 0.1 to 0.

3.

9. The adjustment detection method according to claim 7, characterized in that: During step S5, the rate of pH change during the liquid addition process is monitored in real time. An abnormal state is identified and the liquid addition is terminated when the following conditions are met: , where pH t Let be the pH value at time t. For time intervals, V is the threshold for the rate of change. cumulative V represents the cumulative amount of liquid added. threshold This is the preset maximum liquid addition threshold.

10. The adjustment detection method according to claim 7, characterized in that: The method further includes: when simultaneously processing pH adjustment of multiple containers, a time-slice round-robin scheduling algorithm is used to allocate processing resources of the control terminal. The processing time slice length of each container is proportional to the degree to which its pH value deviates from the target value, and the calculation formula is as follows: T i The time slice T allocated to the i-th container base The base time slice length, β is the adjustment coefficient, and pH max and pH min These are the upper and lower limits of the measurable pH range, respectively.

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