An automated titration device

Abstract

The utility model relates to chemical analysis instrument technical field, concretely is a kind of automatic titration device, including support, reagent bottle is equipped with inverted installation on support, the convex peak that can be inserted into reagent bottle and multiple pipes on connecting convex peak, multiple first pipe holes are equipped on the convex peak, the inside of support is equipped with supporting plate, multiple second pipe holes are equipped on supporting plate, one end of pipe is connected first pipe hole, and the other end is connected titration tube through second pipe hole, color sensor is equipped above each titration tube, conical flask is equipped below each titration tube, magnetic stirrer is equipped below each conical flask, device supports multichannel synchronous operation, end point color can be calibrated storage, solve artificial titration end point determination error and fatigue problem, significantly improve the accuracy and efficiency of batch detection.

Description

Technical Field

[0001] This utility model relates to the field of chemical analysis instrument technology, specifically to an automated titration device. Background Technology

[0002] In experiments, volumetric methods are frequently used. Volumetric analysis, also known as titration analysis, is an important quantitative analytical method. This method involves adding a reagent solution of known concentration to the sample solution of the analyte, and determining the amount of the analyte based on the amount of reagent consumed to complete the chemical reaction. Volumetric analysis uses simple instruments and has the advantages of convenience, speed, and accuracy, making it particularly suitable for the determination of constant components and routine analysis of large batches of samples. However, when using a digital titrator, the titration process involves manually rotating a button to allow the liquid to drip, and the titration endpoint is determined visually. Different people performing the same experiment may have different interpretations of the endpoint color. Furthermore, when one person is analyzing a large number of samples, physical and visual fatigue may occur, causing differences in the endpoint color for the same batch of samples. All of these factors can lead to biased experimental results and present significant limitations.

[0003] 1. Subjective error: Differences in the sensitivity of different operators to the endpoint color lead to result deviations;

[0004] 2. Low efficiency in batch testing: It is difficult to process multiple samples simultaneously by manual operation;

[0005] 3. Fatigue effect: Long-term experiments can easily cause visual fatigue, resulting in inconsistencies in the endpoint determination of samples from the same batch.

[0006] Existing automated titration equipment mostly adopts a single-channel design, which cannot meet the high-throughput requirements, and insufficient sealing of reagent bottles may lead to volatilization or contamination. Therefore, there is an urgent need for an automated titration device that supports independent operation of multiple channels, accurate endpoint determination, and strong sealing. Utility Model Content

[0007] The purpose of this invention is to provide an automated titration device to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: an automated titration device, comprising a support, on which an inverted reagent bottle is mounted, a protrusion that can be inserted into the reagent bottle, and multiple conduits connected to the protrusion. The protrusion has multiple first conduit holes. The support has a support plate inside, and the support plate has multiple second conduit holes. One end of each conduit is connected to a first conduit hole, and the other end is connected to a burette through a second conduit hole. Each burette has a color sensor above it, a conical flask below it, and a magnetic stirrer below each conical flask.

[0009] Preferably, the reagent bottle includes a cap that can be punctured by a protrusion, the cap having a downwardly extending annular protrusion around its periphery, and a sealing ring between the reagent bottle and the support, the sealing ring including an annular groove that can be engaged with the annular protrusion.

[0010] Preferably, a fixing knob is fitted onto the conduit at the position of the second conduit hole, and the fixing knob is locked inside the second conduit hole.

[0011] Preferably, each color sensor, its corresponding burette, and its corresponding magnetic stirrer constitute an independent titration channel; when the color sensor in a titration channel triggers the endpoint signal, only the burette and magnetic stirrer in that channel are stopped, without affecting the operation of other channels.

[0012] Preferably, the catheter is a flexible catheter.

[0013] Preferably, the bottle cap is made of silicone, and the protrusion is made of plastic.

[0014] Compared with existing technologies, this invention provides an automated titration device with the following advantages: This invention achieves precise automation of the titration process through a multi-channel independent control architecture and intelligent color recognition technology.

[0015] 1. Multi-channel parallel processing: Each titration channel (color sensor + burette + magnetic stirrer) operates independently. When any channel triggers the endpoint signal, only the equipment in that channel stops, and the other channels are not disturbed, which greatly improves the efficiency of high-throughput detection.

[0016] 2. Standardized endpoint determination: The color sensor can be pre-calibrated and store the endpoint color characteristic values, eliminating human visual error and ensuring the consistency of results for samples in the same batch;

[0017] 3. Sealed and anti-volatile design: The reagent bottle is installed upside down, with a silicone cap and a plastic puncture-proof structure, combined with a sealing ring with a ring groove locking device, which effectively isolates air contact and prevents reagent evaporation;

[0018] 4. Optimized structure to prevent leakage: The flexible conduit design reduces liquid delivery resistance and avoids the risk of leakage caused by rigid connections;

[0019] 5. Ease of operation: The control panel integrates the switches for titration, stirring and sensor systems, allowing for one-button start and stop of each function module, simplifying the experimental process.

[0020] It comprehensively solves the problems of large errors, low efficiency and volatile reagents in manual titration, and is suitable for large-volume sample analysis in industries such as environmental testing, pharmaceuticals, and food. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a schematic diagram of the bottle cap structure of this utility model;

[0024] Figure 4 This is a front view of the bottle cap of this utility model;

[0025] Figure 5 This is a schematic diagram of the sealing ring of this utility model.

[0026] Explanation of reference numerals in the attached diagram: 1. Support; 2. Reagent bottle; 21. Bottle cap; 3. Delivery tube; 4. Protrusion; 5. First delivery tube hole; 6. Second delivery tube hole; 7. Burette; 8. Color sensor; 9. Erlenmeyer flask; 10. Magnetic stirrer; 11. Control panel; 12. Annular protrusion; 13. Sealing ring; 14. Annular groove; 15. Power switch; 16. Support plate; 17. Fixing knob. Detailed Implementation

[0027] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model:

[0028] Volumetric analysis, also known as titration analysis, is a crucial quantitative analytical method frequently used in experiments. It involves adding a reagent solution of known concentration to the sample solution of the analyte, and determining the amount of the analyte based on the amount of reagent consumed in the chemical reaction. Volumetric analysis utilizes simple instruments and offers advantages such as convenience, speed, and accuracy, making it particularly suitable for determining constant components and routine analysis of large batches of samples. However, in digital titrators, the titration process involves manually rotating a button to allow the liquid to drip, and the titration endpoint is determined visually. Different people performing the same experiment may have different interpretations of the endpoint color; similarly, when one person analyzes a large number of samples, physical and visual fatigue may occur, leading to variations in the endpoint color for the same batch of samples. These discrepancies can result in biased experimental results. This invention aims to automate the experimental process, ensuring a consistent endpoint color, reducing experimental errors, and improving the accuracy of experimental results. This technology can be applied in industries such as agriculture, environmental monitoring, biotechnology, chemicals, cosmetics, electronics, food and beverage, paints and pigments, paper and pulp, petrochemicals, and pharmaceuticals.

[0029] like Figure 1-5As shown, this utility model provides an automated titration device, including a support 1, which supports all components and provides structural stability. The support 1 is provided with an inverted reagent bottle 2, a protrusion 4 that can be inserted into the reagent bottle 2, and multiple conduits 3 connected to the protrusion 4. The protrusion 4 is made of plastic.

[0030] The reagent bottle 2 includes a cap 21 that can be pierced by a protrusion 4. The protrusion 4 penetrates the cap 21 and inserts into the interior of the reagent bottle 2. The cap 21 is made of silicone material to facilitate piercing. The cap 21 has a downwardly extending annular protrusion 12 around its periphery. A sealing ring 13 is provided between the reagent bottle 2 and the support 1. The sealing ring 13 includes an annular groove 14 that can be inserted into the annular protrusion 12 to form a double seal and prevent reagent evaporation.

[0031] The protrusion 4 is provided with multiple first conduit holes 5, the support 1 is provided with a support plate 16 inside, the support plate 16 is provided with multiple second conduit holes 6, one end of the conduit 3 is connected to the first conduit hole 5, and the other end is connected to the burette 7 through the second conduit hole 6, thereby reducing liquid transport resistance and leakage risk.

[0032] A fixing knob 17 is fitted onto the second conduit hole 6, and the fixing knob 17 is locked inside the second conduit hole 6. The fixing knob 17 has external threads, and the burette 7 has internal threads. The internal threads and external threads are tightened together, allowing for electrical communication between the conduit 3 and the burette 7. A color sensor 8 (model LX-111) is installed above each burette 7 to monitor the color of the solution in the conical flask 9 below in real time. The color sensor 8 can perform endpoint color calibration and store the calibrated endpoint color characteristic value. A conical flask 9 is located below each burette 7, and a magnetic stirrer 10 (model HJ-6H) is installed below each conical flask 9 to drive and mix the solution, ensuring uniform reaction.

[0033] A control panel 11 is provided on one side of the bracket 1. The control panel 11 is equipped with a titration system switch A, a stirring system switch B, a color sensor switch C, and a power switch 15. When any color sensor 8 detects that the color of the solution in its corresponding conical flask 9 has reached the preset endpoint color, the control panel 11 controls the burette 7 corresponding to the color sensor 8 to stop titrating and controls the corresponding magnetic stirrer 10 to stop stirring.

[0034] Each color sensor 8, its corresponding burette 7, and its corresponding magnetic stirrer 10 constitute an independent titration channel. When the color sensor 8 of a titration channel triggers the endpoint signal, only the burette 7 and the magnetic stirrer 10 in that channel are stopped, without affecting the operation of other channels.

[0035] Working principle:

[0036] Initial setup: Invert reagent bottle 2 filled with titration reagent (such as ferrous ammonium sulfate solution), puncture silicone cap 21 with peak 4, and tighten sealing ring 13 to prevent leakage; place conical flask 9 containing the sample to be tested on magnetic stirrer 10;

[0037] Endpoint calibration: Place a standard solution that has reached the endpoint (e.g., reddish-brown) in any channel, turn on the color sensor switch C, and record the color characteristic value.

[0038] Multichannel titration: Turn on the stirring system switch B, the magnetic stirrer 10 starts working, and mixes the solution in the conical flask 9; turn on the titration system switch A, the reagent flows into each burette 7 through the delivery tube 3, and is dropped into the corresponding conical flask 9.

[0039] Endpoint determination and stop: When the color sensor 8 of a certain channel detects that the solution color matches the preset characteristic value, it sends a signal to the control panel 11; the control panel 11 immediately stops the burette 7 and magnetic stirrer 10 of that channel, while the other channels continue to operate.

[0040] Example (taking the detection of chemical oxygen demand in water as an example)

[0041] After filling reagent bottle 2 with ferrous ammonium sulfate standard titration solution, place the conical flask 9 containing the water sample and reagent to be titrated on the magnetic stirrer 10, turn on the power switch 15, and turn on the stirring switch B. At this time, the magnetic stirrer 10 starts working, and the liquid in the conical flask 9 remains in a state of mixing. Turn on the titration system switch A, and the titration system starts working. The ferrous ammonium sulfate standard titration solution in reagent bottle 2 is introduced into five burettes through five tubes, and titrated into the corresponding conical flasks 9. When the solution in the conical flask 9 turns reddish-brown, it indicates that the titration endpoint has been reached. At this time, when the five color sensors 8 above the burette 7 detect the reddish-brown liquid in the conical flask 9, the corresponding color sensor 8 triggers a signal, and the titration and stirring in that channel automatically stops, while the other four channels continue to run to the endpoint.

[0042] Color sensor settings: Place a reddish-brown solution that has reached the titration endpoint on the magnetic stirrer 10, turn on the control panel 11, and turn the color sensor switch C to ON. The color sensor 8 will then record the color. Turning it OFF saves the color memory. If the same reddish-brown liquid is placed below the color sensor 8, a beeping sound will be emitted; if liquids of other colors are placed below the color sensor 8, there will be no reaction. Simultaneously with the beeping sound, the titration and stirring systems at the corresponding positions will stop operating.

[0043] The actual operation process of this utility model is clear and concise: after completing the sealing and installation of reagent bottles and the endpoint color calibration during the initialization stage, multi-channel synchronous titration can be started. Taking the detection of chemical oxygen demand in water as an example, five sets of water samples can be titrated simultaneously. When the solution in any conical flask reaches the preset reddish-brown endpoint, the color sensor of that channel immediately triggers a control signal, automatically cutting off the liquid flow in the corresponding burette and stopping the magnetic stirrer. The remaining channels continue to run until their respective endpoints. The core advantage of the device lies in the integration of gravity-guided liquid, sealing to prevent volatilization, flexible transport, and intelligent endpoint recognition technology systems. This not only solves the inherent defects of visual fatigue and subjective error in manual titration but also breaks through the bottleneck of limited channel count in traditional automated equipment. Its modular architecture can be flexibly expanded to 8 channels or higher throughput configurations, suitable for various titration scenarios from laboratory research to industrial production line quality inspection, providing efficient and reliable technical support for large-scale sample analysis in agriculture, pharmaceuticals, environmental protection, and other fields.

[0044] This invention significantly improves the accuracy and efficiency of titration analysis by integrating multi-channel independent control with intelligent endpoint recognition technology. The device adopts a modular design, allowing each titration channel (color sensor-burette-magnetic stirrer) to start and stop independently, enabling parallel processing of high-throughput samples and avoiding the efficiency bottleneck of traditional single-channel devices. The color sensor supports endpoint color calibration and feature value storage, completely eliminating subjective differences in manual judgment and ensuring consistency of batch experimental results. The inverted reagent bottle combined with a silicone cap puncture-guided liquid structure and a double-locking design with a ring seal effectively isolates air contact, preventing the failure of volatile reagents. Flexible tubing and threaded burette interfaces further reduce the risk of leakage and ensure long-term operational reliability. The overall device is easy to operate, with one-click management of each system via the control panel, greatly reducing labor intensity. It is suitable for fields requiring high-volume, precise analysis, such as environmental monitoring, pharmaceutical quality inspection, and food testing.

[0045] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. An automated titration apparatus, characterized in that: The device includes a support (1), on which is installed an inverted reagent bottle (2), a protrusion (4) that can be inserted into the reagent bottle (2), and multiple conduits (3) connected to the protrusion (4). The protrusion (4) is provided with multiple first conduit holes (5). The support (1) is provided with a support plate (16) inside, and the support plate (16) is provided with multiple second conduit holes (6). One end of the conduit (3) is connected to the first conduit hole (5), and the other end is connected to a burette (7) through the second conduit hole (6). Each burette (7) is provided with a color sensor (8) above it, and each burette (7) is provided with a conical flask (9) below it. Each conical flask (9) is provided with a magnetic stirrer (10) below it.

2. The automated titration apparatus according to claim 1, characterized in that: The reagent bottle (2) includes a cap (21) that can be punctured by a protrusion (4). The cap (21) has a downwardly extending annular protrusion (12) around its periphery. A sealing ring (13) is provided between the reagent bottle (2) and the support (1). The sealing ring (13) includes an annular groove (14) that can be inserted into the annular protrusion (12).

3. The automated titration apparatus according to claim 1, characterized in that: The conduit (3) is fitted with a fixing knob (17) at the position of the second conduit hole (6), and the fixing knob (17) is locked inside the second conduit hole (6).

4. The automated titration apparatus according to claim 1, characterized in that: Each color sensor (8), its corresponding burette (7), and its corresponding magnetic stirrer (10) constitute an independent titration channel. When the color sensor (8) of a titration channel triggers the endpoint signal, only the burette (7) and magnetic stirrer (10) in that channel are stopped, without affecting the operation of other channels.

5. The automated titration apparatus according to claim 1, characterized in that: The catheter (3) is a flexible catheter.

6. The automated titration apparatus according to claim 2, characterized in that: The bottle cap (21) is made of silicone, and the protrusion (4) is made of plastic.

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