Continuous stirring automatic titration device based on optical sensing

Abstract

The utility model provides a continuous stirring automatic titration device based on optical sensing, which comprises a burette, a titrant storage device and a conical flask arranged below the burette, the titrant storage device contains titrant, a liquid pump is arranged on the side surface of the titrant storage device, one end of the liquid pump is connected with a conduit, and the other end of the liquid pump is connected with the conical flask. The conduit is inserted below the titrant liquid level, the other end of the conduit is connected with the burette through a rubber tube, a flowmeter and a first electromagnetic valve are arranged at the lower end of the burette, the first electromagnetic valve is connected with a color recognition sensor arranged on the side face of the conical flask, a rotor is arranged in the conical flask, and the conical flask is placed on a workbench of a magnetic stirrer. And an LED irradiation lamp is arranged on a workbench of the magnetic stirrer. The automatic titration device is simple in structure, easy to operate, capable of automatically providing a titrant and judging a titration end point, high in automation degree and capable of effectively improving the test precision and the working efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of titration devices, in particular to a continuous stirring automatic titration device based on optical sensing. Background Art

[0002] Chemical volumetric method, also known as titration method, is a commonly used analytical method in simple water quality analysis. It can be divided into two categories: manual operation and fully automatic potentiometric titrator method. At present, the general laboratory titration analysis adopts manual titration method, which indicates the titration end point based on the color change of the indicator. The test personnel visually observe the volume consumed by the standard solution and calculate the analysis results.

[0003] Manual operation is economical, but there are many interference factors. Manual operations such as the estimation of the burette and the speed of titration will cause certain systematic errors in the experimental data. In addition, the operator needs to accurately capture the critical point of the solution color change while shaking the conical flask continuously, which requires a certain level of technical skills from the operator. Finally, the judgment of the titration end point is highly subjective. Different testers have different abilities to distinguish and react to subtle changes in color, which leads to deviations in the test results. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a continuous stirring automatic titration device based on optical sensing, which has a simple structure, is easy to operate, has a high degree of automation, and can effectively improve test accuracy and work efficiency.

[0005] The utility model provides a technical solution: a continuous stirring automatic titration device based on optical sensing, comprising a burette, a titrant storage and a conical flask arranged below the burette, the titrant storage is filled with titrant, a liquid pump is arranged on the side of the titrant storage, one end of the liquid pump is connected with a catheter, the catheter is inserted below the titrant liquid level, and the other end is connected with the burette through a rubber tube, a flow meter and a first electromagnetic valve are arranged at the lower end of the burette, the first electromagnetic valve is connected with a color recognition sensor arranged on the side of the conical flask, a rotor is arranged in the conical flask, the conical flask is placed on the workbench of a magnetic stirrer, and an LED irradiation lamp is arranged on the workbench of the magnetic stirrer.

[0006] Furthermore, the magnetic stirrer includes a control panel and a heating plate, the conical flask is placed on the heating plate, the control panel is provided with a power switch, a heating switch, a speed adjustment knob and a liquid crystal display screen displaying the titration amount and the concentration of the solution to be tested, and a controller is provided on the side of the magnetic stirrer, and the controller is connected to a buzzer.

[0007] Furthermore, the rubber tube is provided with a second solenoid valve and a precision peristaltic pump.

[0008] Furthermore, the automatic titration device also includes a terminal device, and the terminal device is connected to the liquid pump, the color recognition sensor, the flow meter, the first solenoid valve, the second solenoid valve and the controller.

[0009] Furthermore, the terminal device is a computer or a wireless handheld terminal device.

[0010] Furthermore, the magnetic stirrer is arranged on a lifting platform for adjusting the height.

[0011] Furthermore, the burette is fixed on the crossbeam of the first supporting frame.

[0012] Furthermore, the color recognition sensor is fixed on the second support frame, and the color recognition sensor adopts a photoresistor or a photodiode.

[0013] Furthermore, the rotor is a permanent magnet or an electromagnet.

[0014] Furthermore, the liquid pump is a metering pump with adjustable flow rate, and a bracket is placed at the bottom of the liquid pump.

[0015] Beneficial effects of the utility model:

[0016] (1) The magnetic stirrer can quickly and thoroughly mix the test solution with the standard solution, avoiding errors caused by untimely color change due to uneven mixing, reducing the workload of test personnel and improving test accuracy. The heating plate it is equipped with can control the test solution within a reasonable range, avoiding test errors caused by thermal expansion and contraction of the liquid;

[0017] (2) The titrant can be automatically added to the burette through a liquid pump without manual addition. The automated operation reduces the labor intensity and improves the operating efficiency.

[0018] (3) The titration endpoint is determined by the color recognition sensor, which effectively avoids human errors in the titration process and facilitates test personnel to promptly and accurately determine the volumetric analysis titration endpoint, thereby improving work efficiency and the accuracy of test data.

[0019] (4) LED lamps can emit visible white light as detection light, making the color detection range wider and not affected by the surface color of the object. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 It is an enlarged view of the control panel of the magnetic stirrer of the utility model;

[0022] Figure 3It is a brief flow chart of the working principle of the utility model;

[0023] In the figure: 1. Magnetic stirrer; 1-1 power switch; 1-2 heating switch; 1-3 speed adjustment knob; 1-4 LCD screen; 2. Heating plate; 3. Rotor; 4. Conical flask; 5. LED irradiation lamp; 6. Flow meter; 7. Burette; 8. Second solenoid valve; 9. Precision peristaltic pump; 10. First solenoid valve; 11. Color recognition sensor; 12. Controller; 13. Terminal device; 14. Lifting platform; 15. Liquid pump; 16. Titrant reservoir; 17. Titrant; 18. Second support frame; 19. First support frame; 20. Beam; 21. Rubber tube; 22. Catheter. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and should not be understood as limiting the present invention. In order to better illustrate the specific implementation methods of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. Based on the specific implementation methods of the present invention, all other specific implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "front", "rear", "upper", "lower" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1-3The shown device is a continuous stirring automatic titration device based on optical sensing, comprising a burette 7, a titrant reservoir 16 and a conical flask 4 containing a solution to be tested and arranged below the burette 7, wherein the titrant reservoir 16 contains a titrant 17, and a liquid pump 15 is arranged on the side of the titrant reservoir 16, one end of the liquid pump 15 is connected to a conduit 22, the conduit 22 is inserted below the liquid level of the titrant 17, and the other end is connected to the burette 7 through a rubber tube 21, the lower end of the burette 7 is provided with a flow 6 and a first electromagnetic valve 10, the first electromagnetic valve 10 is connected to a color recognition sensor 11 arranged on the side of the conical flask 4, a rotor 3 is arranged in the conical flask 4, the conical flask 4 is placed on the workbench of the magnetic stirrer 1, and an LED irradiation lamp 5 is arranged on the workbench of the magnetic stirrer 1.

[0028] The magnetic stirrer 1 includes a control panel and a heating plate 2, the conical flask 4 is placed on the heating plate 2, the control panel is provided with a power switch 1-1, a heating switch 1-2, a speed adjustment knob 1-3 and a liquid crystal display screen 1-4 showing the titration amount and the concentration of the solution to be tested, and a controller 12 is provided on the side of the magnetic stirrer 1, and the controller 12 is connected to the buzzer, the power switch and the heating switch. The rubber tube 21 is provided with a second solenoid valve 8 and a precision peristaltic pump 9. The automatic titration device also includes a terminal device 13, and the terminal device 13 is connected to the liquid pump 15, the color recognition sensor 11, the flow meter 6, the first solenoid valve 10, the second solenoid valve 8 and the controller 12, and controls their operation.

[0029] The terminal device 13 is a computer or a wireless handheld terminal device to reduce costs, simplify operations, and reduce device area.

[0030] The magnetic stirrer 1 is arranged on a lifting platform 14 for adjusting the height, so as to adjust the height of the conical flask 4 .

[0031] The burette 7 is fixed on the crossbeam 20 of the first support frame 19. The color recognition sensor 11 is fixed on the second support frame 18. The color recognition sensor 11 adopts a photoresistor or a photodiode. The rotor 3 is a permanent magnet or an electromagnet.

[0032] The liquid pump 15 is a metering pump with adjustable flow rate. To ensure its stability during operation, a bracket is placed at the bottom of the liquid pump 15 .

[0033] The LED irradiation lamp 5 can emit visible white light as detection light, so that the color detection range is wider and is not affected by the surface color of the object, and can be installed vertically to the conical flask.

[0034] When the utility model is used specifically, the liquid flow rate and frequency are set on the terminal device 13, and the concentration of the titrant 17 is input. The terminal device 13 is connected to the liquid pump 15 and issues instructions to control the liquid pump 15 to extract the titrant 17 from the titration storage 16 at an appropriate flow rate and frequency, and the quantitative titrant quickly passes through the conduit 22. At the same time, the terminal device 13 controls the second electromagnetic valve 8 and the first electromagnetic valve 10 to remain in the open state, controls the color recognition sensor 11 and the flow meter 6 to maintain a real-time monitoring state, and enables the controller 12 to turn on the magnetic stirrer, and the quantitative titrant enters the interior of the burette 7 and drips into the conical flask 4 from the outlet at the lower end of the burette 7, and mixes with the solution in the conical flask 4. The liquid is mixed evenly, the LED irradiator 5 can provide white light as detection light and illuminate the solution in the conical flask 4, the color recognition sensor 11 monitors the color of the solution in the conical flask 4 in real time, and when the color reaches the preset color standard reference, the color recognition sensor 11 transmits an electrical signal to the terminal device 13, and the terminal device 13 closes the second solenoid valve 8, the first solenoid valve 10, and the liquid pump 15 to prevent the titrant 17 from continuing to flow through the flow meter 6. The data in the flow meter 6 is transmitted to the terminal device 13 in real time, and then transmitted to the LCD display 1-4 by the terminal device 13. At the same time, the terminal device 13 sends an instruction to the controller 12 to start the buzzer to prompt the experimenter to record the test data.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A continuous stirring automatic titration device based on optical sensing, characterized in that: The invention comprises a burette (7), a titrant storage (16) and a conical flask (4) arranged below the burette (7), wherein the titrant storage (16) contains a titrant (17), a liquid pump (15) is arranged on the side of the titrant storage (16), one end of the liquid pump (15) is connected to a conduit (22), the conduit (22) is inserted below the liquid level of the titrant (17), and the other end is connected to the burette (7) through a rubber tube (21), a flow meter (6) and a first electromagnetic valve (10) are arranged at the lower end of the burette (7), the first electromagnetic valve (10) is connected to a color recognition sensor (11) arranged on the side of the conical flask (4), a rotor (3) is arranged in the conical flask (4), the conical flask (4) is placed on the workbench of a magnetic stirrer (1), and an LED irradiation lamp (5) is arranged on the workbench of the magnetic stirrer (1).

2. The optical sensing-based continuous stirring automatic titration device according to claim 1, characterized in that: The magnetic stirrer (1) comprises a control panel and a heating plate (2), the conical flask (4) is placed on the heating plate (2), the control panel is provided with a power switch (1-1), a heating switch (1-2), a speed adjustment knob (1-3) and a liquid crystal display (1-4) displaying the titration amount and the concentration of the solution to be tested, and a controller (12) is arranged on the side of the magnetic stirrer (1), and the controller (12) is connected to a buzzer.

3. The optical sensing-based continuous stirring automatic titration device according to claim 2, characterized in that: The rubber tube (21) is provided with a second electromagnetic valve (8) and a precision peristaltic pump (9).

4. The optical sensing-based continuous stirring automatic titration device according to claim 3, characterized in that: The automatic titration device further comprises a terminal device (13), wherein the terminal device (13) is connected to a liquid pump (15), a color recognition sensor (11), a flow meter (6), a first solenoid valve (10), a second solenoid valve (8) and a controller (12).

5. The optical sensing-based continuous stirring automatic titration device according to claim 4, characterized in that: The terminal device (13) is a computer or a wireless handheld terminal device.

6. The optical sensing-based continuous stirring automatic titration device according to claim 1, characterized in that: The magnetic stirrer (1) is arranged on a lifting platform (14) for adjusting the height.

7. The optical sensing-based continuous stirring automatic titration device according to claim 1, characterized in that: The burette (7) is fixed on a crossbeam (20) of a first support frame (19).

8. The optical sensing-based continuous stirring automatic titration device according to claim 1, characterized in that: The color recognition sensor (11) is fixed on the second support frame (18), and the color recognition sensor (11) adopts a photoresistor or a photodiode.

9. The optical sensing-based continuous stirring automatic titration device according to claim 1, characterized in that: The rotor (3) is a permanent magnet or an electromagnet.

10. The optical sensing-based continuous stirring automatic titration device according to claim 1, characterized in that: The liquid pump (15) is a metering pump with adjustable flow rate, and a bracket is placed at the bottom of the liquid pump (15).

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