Titration stirring photometer

Abstract

The invention is applied to the technical field of chemical analysis instruments, and discloses a titration stirring photometer which comprises a base, an LED light source is fixedly mounted on the upper surface of one end of the base, a measuring photocell is fixedly mounted on the upper surface of the other end of the base, and a light splitting groove is formed in the upper surface of the middle section of the base. One end of the light splitting groove is fixedly connected with a lens, a reference photocell is fixedly mounted on the upper surface of the base on one side of the light splitting groove, and the light splitting groove is penetrated by a semi-reflecting and semi-transmitting reflecting mirror. According to the titration stirring photometer, the light source is divided into the measuring light path and the reference light path by adopting the design of the light splitting groove comprising the semi-reflecting and semi-transmitting reflecting mirror, and the measuring photocell and the reference photocell are configured, so that the double-light-path structure can effectively compensate light intensity fluctuation caused by factors such as light source fluctuation and environment temperature change; therefore, the stability and the accuracy of luminosity detection are remarkably improved, and the defect that a traditional single light path is easily interfered is overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical analysis instruments, in particular to a titration stirring photometer. BACKGROUND

[0002] Titration analysis calculates the content of a substance by measuring the volume of standard reagent consumed in the complete reaction with the substance to be measured, and has the characteristics of wide application, relatively simple operation and low cost. It has become one of the indispensable technical means in chemical analysis. Traditional titration analysis relies on manual operation, that is, the operator observes the color change (for example, using an indicator) or turbidity change of the solution by naked eye to determine the titration endpoint. Although this sensory titration method is simple and has been used until now, it is highly subjective and is significantly affected by factors such as operator experience, environmental light, color discrimination ability, etc., resulting in poor reproducibility and accuracy of the analysis results, and cannot realize value traceability, making it difficult to meet the increasing requirements of modern analytical chemistry for precision and standardization. In order to overcome the limitations of manual titration, instrumented titration methods have gradually developed. Potentiometric titration technology is one of the earliest titration methods to realize automation. It determines the endpoint by measuring the change of the potential of the indicating electrode during titration, thereby improving the objectivity and accuracy of the measurement. In addition, temperature titration and other technologies have also been applied. However, these methods still have some limitations: potentiometric titration may require specific electrodes and have certain requirements for the measured system, sometimes there is signal delay or greater influence from temperature, and temperature titration may be disturbed by environmental heat exchange and is limited in application to complex systems. For titration reactions involving color change or turbidity change, photometric detection of the endpoint is an intuitive idea. Existing technologies attempt to use photoelectric conversion elements to replace the human eye to determine the endpoint. For example, some automatic titrators use a photoelectric detection unit composed of a light source, a lens, a titration cup and a photoelectric converter (such as a phototransistor) to convert the change in transmitted light intensity of the solution into an electrical signal to control the titration process. To some extent, this method reduces subjective errors. However, the existing photometric titration device may still have the following shortcomings: The placement of the sample titration vessel needs to ensure consistent position for each experiment, and the uniformity of stirring is crucial for the reaction and detection. Although magnetic stirring is commonly used, the position of the stirrer is not stable or the stirring vortex may affect the consistency of the light path through the solution. At the same time, it is crucial to ensure that the titrant and the measured liquid are rapidly and uniformly mixed to ensure that the reaction is complete and the endpoint is accurately determined. Simple dropwise addition may not be efficient, especially in online analysis that requires rapid response. To improve measurement anti-interference capability (such as light source fluctuation), an ideal photometric detection system should include a reference optical path. However, it is challenging to effectively implement a dual-optical-path (measurement optical path and reference optical path) design in a compact structure without significantly increasing complexity and ensuring optical path alignment. Some existing automated titrators may not have fully integrated modules such as drug administration, stirring, photometric detection, and signal processing to achieve convenient online and real-time analysis, and some operations still require a lot of manual intervention. Therefore, there is an urgent need in this field for a new type of titration stirring photometer that can effectively integrate functions such as high-precision automatic drug delivery, efficient and uniform stirring, and stable dual-path photometric detection, overcoming the shortcomings of existing technologies in terms of optical stability, mixing efficiency, and degree of automation. It is particularly suitable for titration analysis occasions that require online and real-time monitoring. Summary of the Invention

[0003] The purpose of this invention is to provide a titration stirring photometer to solve the problems of low mixing efficiency, poor optical stability and insufficient automation mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a titration stirring photometer, comprising a base, an LED light source fixedly mounted on the upper surface of one end of the base, and a measuring photocell fixedly mounted on the upper surface of the other end of the base, a beam-splitting groove formed inside the upper surface of the middle section of the base, a lens fixedly connected to one end of the beam-splitting groove, a reference photocell fixedly mounted on the upper surface of the base on one side of the beam-splitting groove, the beam-splitting groove being penetrated by a semi-reflective mirror, a magnetic stirrer disposed below one end of the base, a stirring dish placed on the upper end of the magnetic stirrer, and a rotor placed inside the stirring dish, one end of the semi-reflective mirror penetrating the outer surface of the base, and a mounting block fixedly connected to the end of the semi-reflective mirror outside the base, a rotating anti-detachment plate mounted on the outer surface of the base on one side of the mounting block, a sliding cylinder fixedly disposed on the lower surface of the base, and a sliding limiting plate mounted on the end of the sliding cylinder facing the stirring dish, and an installation groove formed on the outer surface of the middle section of the base directly opposite the stirring dish; A lifting electric push rod is fixedly installed on the upper surface of the base where the mounting slot is located. A mounting frame is fixedly installed on the upper surface of the base facing the mounting slot. A sliding lifting cylinder is installed at the upper end of the mounting frame, and a transparent liquid suction tube is fixedly connected to the lower end of the lifting cylinder. A sliding piston block is installed at the upper end of the lifting cylinder. A liquid storage tank is fixedly installed on the upper surface of the mounting frame. A clearance groove is opened on one side of the outer surface of the lifting cylinder. A piston cylinder is fixedly installed on the lower surface of one end of the mounting frame. An inlet pipe is connected between one end of the piston cylinder and the liquid storage tank. An outlet pipe is provided on the outer surface of one end of the piston cylinder. A first one-way valve is installed at the connection between the inlet pipe and the piston cylinder. A second one-way valve is installed at the connection between the outlet pipe and the piston cylinder. A piston rod is installed at the end of the piston cylinder facing the clearance groove.

[0005] Preferably, the LED light source, the measuring photocell, and the lens are on the same straight line, the beam splitter is a T-shaped design, and one end of the beam splitter is positioned directly opposite the reference photocell, and the semi-reflective mirror is positioned at an angle.

[0006] By adopting the above technical solution, the collimation of the measurement optical path can be ensured, so that the beam can accurately pass through the solution being measured. The T-shaped beam splitter and the obliquely set semi-reflective and semi-transparent mirror can effectively divide the beam into the measurement optical path and the reference optical path, providing a stable optical basis for dual-optical-path detection.

[0007] Preferably, the outer surface of the upper end of the stirring dish is in contact with the inner surface of the mounting groove, and the mounting groove is U-shaped.

[0008] By adopting the above technical solution, the stirring dish can be stably positioned in the mounting groove of the base, ensuring that the position of the sample container is consistent in each experiment, thereby ensuring that the optical path through the solution is constant and improving the repeatability and accuracy of the measurement.

[0009] Preferably, the anti-detachment plate is a circular plate with a cross-section at one end, and the outer surface of one end of the anti-detachment plate is in contact with the outer surface of the mounting block.

[0010] By adopting the above technical solution, the mounting block is limited by a rotatable anti-detachment plate, which can easily fix or loosen the semi-reflective mirror, making it convenient for angle calibration, cleaning or replacement, and improving the maintainability of the instrument.

[0011] Preferably, a spring is connected between the sliding cylinder and the limiting plate, and the outer surface of one end of the limiting plate is in contact with the outer surface of the stirring dish, and the end of the limiting plate facing the opening of the mounting groove is designed with an inclined surface.

[0012] Using the above technical solution, when the mixing dish is placed in, its outer wall presses against the inclined surface of the limiting plate, causing the limiting plate to compress the spring and move backward to make room. After the mixing dish is placed in place, the limiting plate returns to its original position under the action of the spring and sticks tightly to the dish wall, realizing the quick and stable clamping of the mixing dish. Moreover, the inclined surface design of the limiting plate makes the placement operation more labor-saving and convenient.

[0013] Preferably, the lower end of the lifting cylinder is connected to the upper end of the transparent suction tube, and the upper end of the lifting cylinder is connected to the piston block by sliding friction.

[0014] By adopting the above technical solution, a variable sealed cavity is formed between the lifting cylinder, the transparent suction tube and the piston block. When the piston block slides relative to the lifting cylinder, negative or positive pressure can be generated in the cavity, thereby realizing the function of sucking liquid from the stirring dish or draining liquid into the stirring dish.

[0015] Preferably, the piston block is E-shaped, and a spring connects the piston block to the lifting cylinder.

[0016] By adopting the above technical solution, the E-shaped piston block structure and the spring connection between it and the lifting cylinder ensure a stable and slidable seal between the piston block and the inner wall of the lifting cylinder. The spring force enables the piston block to automatically reset, providing power for the liquid suction operation and maintaining the sealed state.

[0017] Preferably, the relief groove is designed in the shape of a right trapezoid, and the inclined surface of the relief groove faces downward and away from the piston cylinder.

[0018] By adopting the above technical solution, the inclined surface design of the clearance groove allows the lifting cylinder to smoothly push the end of the piston rod during the upward process, forcing the piston rod to retract into the piston cylinder, thereby pumping out the titrant in the storage tank. When the lifting cylinder descends, the inclined surface opens up, and the piston rod can automatically reset under the action of the spring, preparing for the next pumping.

[0019] Preferably, the piston rod and the piston cylinder are connected by sliding friction, and a spring is connected between the piston rod and the piston cylinder. The end of the piston rod located outside the piston cylinder is in contact with the outer surface of the lifting cylinder.

[0020] Using the above technical solution, the piston rod tends to contact the outer wall of the lifting cylinder at its end under the action of the spring. By controlling the extension and retraction of the piston rod through the specific shape of the clearance groove, the vertical movement of the lifting cylinder is converted into the horizontal movement of the piston rod, thereby precisely controlling the liquid absorption and discharge process of the piston cylinder and realizing automatic drug delivery.

[0021] Compared with the prior art, the beneficial effects of the present invention are: the titration stirring spectrophotometer: 1. By adopting a beam splitter design that includes a semi-reflective and semi-transparent mirror, the light source is divided into a measurement optical path and a reference optical path, and a measurement photocell and a reference photocell are configured. This dual-optical-path structure can effectively compensate for light intensity fluctuations caused by factors such as light source fluctuations and changes in ambient temperature, thereby significantly improving the stability and accuracy of photometric detection and overcoming the shortcomings of traditional single-optical-path systems that are easily interfered with. 2. The angled semi-reflective and semi-transparent mirror and the T-shaped beam splitter design help to accurately align and stabilize the optical path. In addition, the semi-reflective and semi-transparent mirror is fixed by mounting blocks and a rotatable anti-detachment plate, which facilitates calibration and maintenance and solves the problem of fixed position of traditional optical components and easy optical path displacement during long-term use. 3. The stirring system, consisting of a magnetic stirrer, a stirring dish, and a rotor, and the automatic drug delivery and aspiration system, consisting of a lifting electric push rod, a transparent suction tube, and a piston block, ensure that the titrant can be added to the reaction system online and accurately. The magnetic stirring achieves rapid and uniform mixing, avoiding the problems of low mixing efficiency and incomplete reaction that may exist in simple drop addition. It is particularly suitable for online analysis occasions that require rapid response. At the same time, the method of drawing the supernatant into the transparent suction tube for detection also avoids the influence of eddies on the detection results. 4. The inclined limiting plate design connecting the sliding cylinder and the spring, combined with the U-shaped mounting groove, can easily and stably fix the stirring dish, reducing interference caused by inconsistent container placement or the stirring vortex on the consistency of the optical path. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the connection between the base, sliding cylinder, and limiting plate of the present invention; Figure 3 This is a three-dimensional structural diagram of the connection cross-section of the base, LED light source, and measuring photovoltaic cell of the present invention; Figure 4 This is a three-dimensional structural diagram of the connection between the base, sliding cylinder, and limiting plate of the present invention. Figure 5 This is a three-dimensional structural diagram of the magnetic stirrer, stirring dish, and rotor connection of the present invention; Figure 6 This is a three-dimensional structural diagram of the connection between the mounting frame, lifting cylinder, and transparent suction tube of the present invention; Figure 7 This is a three-dimensional structural diagram of the connection cross-section of the mounting frame, lifting cylinder, and transparent suction tube of the present invention. Figure 8 This is a three-dimensional structural diagram of the cross-sectional view of the connection between the piston cylinder and the piston rod of the present invention; Figure 9This is a three-dimensional structural diagram of the cross-sectional view of the semi-reflective and semi-transparent reflector, mounting block, and anti-detachment plate of the present invention; Figure 10 This is a three-dimensional cross-sectional view of the overall working state of the present invention.

[0023] In the diagram: 1. Base; 2. LED light source; 3. Measuring photocell; 4. Lens; 5. Beam splitter; 6. Reference photocell; 7. Semi-reflective mirror; 8. Magnetic stirrer; 9. Stirring dish; 10. Rotor; 11. Mounting block; 12. Anti-detachment plate; 13. Sliding cylinder; 14. Limiting plate; 15. Mounting slot; 16. Lifting electric push rod; 17. Mounting frame; 18. Lifting cylinder; 19. Transparent suction tube; 20. Piston block; 21. Liquid storage tank; 22. Clearing groove; 23. Piston cylinder; 24. Inlet pipe; 25. Outlet pipe; 26. First one-way valve; 27. Second one-way valve; 28. Piston rod. Detailed Implementation

[0024] 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.

[0025] Please see Figures 1-10 The present invention provides a technical solution: a titration stirring photometer.

[0026] Example 1: This example discloses: a base 1, with an LED light source 2 fixedly mounted on the upper surface of one end of the base 1, and a measuring photocell 3 fixedly mounted on the upper surface of the other end of the base 1. A beam splitter 5 is formed inside the upper surface of the middle section of the base 1, with a lens 4 fixedly connected to one end of the beam splitter 5. A reference photocell 6 is fixedly mounted on the upper surface of the base 1 on one side of the beam splitter 5. The beam splitter 5 is penetrated by a semi-reflective mirror 7. A magnetic stirrer 8 is provided below one end of the base 1, and a [missing information - likely a device or component] is placed on the upper end of the magnetic stirrer 8. A stirring dish 9 is provided, and a rotor 10 is placed inside the stirring dish 9. One end of a semi-reflective mirror 7 penetrates the outer surface of the base 1, and a mounting block 11 is fixedly connected to the end of the semi-reflective mirror 7 located outside the base 1. A rotating anti-detachment plate 12 is installed on the outer surface of the base 1 on one side of the mounting block 11. A sliding cylinder 13 is fixedly provided on the lower surface of the base 1, and a sliding limiting plate 14 is installed on the end of the sliding cylinder 13 facing the stirring dish 9. An installation groove 15 is opened on the outer surface of the middle section of the base 1 directly opposite the stirring dish 9. The LED light source 2, the measuring photocell 3, and the lens 4 are on the same straight line. The beam splitter 5 is a T-shaped design, and one end of the beam splitter 5 is set directly opposite the reference photocell 6. The semi-reflective mirror 7 is set at an angle. The outer surface of the upper end of the stirring dish 9 is in contact with the inner surface of the mounting groove 15, and the mounting groove 15 is U-shaped. The anti-detachment plate 12 is a circular plate with a cross-section at one end, and the outer surface of one end of the anti-detachment plate 12 is in contact with the outer surface of the mounting block 11. A spring is connected between the sliding cylinder 13 and the limiting plate 14, and the outer surface of one end of the limiting plate 14 is in contact with the outer surface of the stirring dish 9, and the end of the limiting plate 14 facing the opening of the mounting groove 15 is designed with a slope. First, the LED light source 2 emits a beam of light, which is focused by the lens 4 and enters the beam splitter 5 inside the base 1. The beam splitter 5 has a T-shaped design and a semi-reflective mirror 7 is obliquely arranged inside. After the beam of light encounters the semi-reflective mirror 7, part of the light is transmitted to form a measurement light path and directly illuminates the measurement photocell 3, while the other part of the light is reflected to form a reference light path and illuminates the reference photocell 6. This dual-light path design can compensate for light source fluctuations and environmental changes in real time, and improve the stability and accuracy of photometric detection. One end of the semi-reflective mirror 7 passes through the outside of the base 1 and is fixed by the mounting block 11. The anti-detachment plate 12 is rotatably installed on the outer surface of the base 1. When the anti-detachment plate 12 rotates, its non-section side is in contact with the outer surface of the mounting block 11 to prevent the semi-reflective mirror 7 from loosening, which facilitates calibration and maintenance. Meanwhile, the stirring dish 9 is placed on the magnetic stirrer 8, which contains a rotor 10. The magnetic stirrer 8 drives the rotor 10 to rotate, so that the solution is mixed evenly. In order to ensure that the stirring dish 9 is in the same position and reduce optical path interference, the outer surface of the upper end of the stirring dish 9 is in contact with the inner surface of the mounting groove 15 on the base 1. A limiting plate 14 is installed in the sliding cylinder 13 on the lower surface of the base 1. The limiting plate 14 is connected to the sliding cylinder 13 by a spring, and the end of the limiting plate 14 facing the opening of the mounting groove 15 is designed with a slope. When the stirring dish 9 is pushed into the mounting groove 15, the slope of the limiting plate 14 is squeezed, the spring is compressed, and the limiting plate 14 slides and closely adheres to the outer surface of the stirring dish 9, thereby stabilizing and fixing the stirring dish 9 and avoiding the influence of the optical path consistency due to the displacement of the container position or the stirring eddy current. Throughout the process, the optical system detects the absorbance of the solution through dual optical paths, while the stirring system ensures uniform mixing, thus providing a reliable basis for titration analysis.

[0027] Example 2: This example discloses, based on Example 1, that: a lifting electric push rod 16 is fixedly installed on the upper surface of the base 1 where the mounting groove 15 is located, and a mounting frame 17 is fixedly installed on the upper surface of the base 1 facing the side of the lifting electric push rod 16 toward the mounting groove 15. A sliding lifting cylinder 18 is installed at the upper end of the mounting frame 17, and a transparent suction tube 19 is fixedly connected to the lower end of the lifting cylinder 18. A sliding piston block 20 is installed at the upper end of the lifting cylinder 18, and a liquid storage tank 21 is fixedly installed on the upper surface of the mounting frame 17. A clearance groove 22 is provided on one side of the outer surface of the lifting cylinder 18. A piston cylinder 23 is fixedly provided on the lower surface of one end of the mounting bracket 17. An inlet pipe 24 is connected between one end of the piston cylinder 23 and the liquid storage tank 21. An outlet pipe 25 is provided on the outer surface of one end of the piston cylinder 23. A first check valve 26 is installed at the connection between the inlet pipe 24 and the piston cylinder 23. A second check valve 27 is installed at the connection between the outlet pipe 25 and the piston cylinder 23. A piston rod 28 is installed on the end of the piston cylinder 23 facing the clearance groove 22. The lower end of the lifting cylinder 18 is connected to the upper end of the transparent suction tube 19, and the upper end of the lifting cylinder 18 is connected to the piston block 20 by sliding friction. The piston block 20 is designed in an E-shape, and a spring connects the piston block 20 to the lifting cylinder 18; The clearance groove 22 is designed in the shape of a right trapezoid, and the inclined surface of the clearance groove 22 is set downward and away from the piston cylinder 23; The piston rod 28 and the piston cylinder 23 are connected by sliding friction, and a spring is connected between the piston rod 28 and the piston cylinder 23. One end of the piston rod 28 located outside the piston cylinder 23 is in contact with the outer surface of the lifting cylinder 18. The lifting electric push rod 16 is fixed on the upper surface of the base 1, pushing the lifting cylinder 18 on the mounting frame 17 to slide vertically. The lower end of the lifting cylinder 18 is fixedly connected to the transparent suction tube 19, and the upper end is equipped with a piston block 20. The piston block 20 is designed in an E-shape and is connected to the lifting cylinder 18 through a spring to form sliding friction. When the lifting electric push rod 16 drives the lifting cylinder 18 to descend, the transparent suction tube 19 is inserted into the solution in the stirring dish 9. At the same time, since the piston rod 28 and the piston cylinder 23 are connected by sliding friction and are connected by a spring, the piston rod 28 slides into the clearance groove 22 on the outside of the reset lifting cylinder 18 under the support of the spring. At this time, the internal pressure of the piston cylinder 23 decreases and the agent in the storage tank 21 is drawn in through the first one-way valve 26 and the liquid inlet pipe 24. When the lifting cylinder 18 rises, the inclined surface of the clearance groove 22 pushes the piston rod 28 to slide into the piston cylinder 23, compressing the spring inside the piston cylinder 23. The movement of the piston rod 28 causes a pressure change inside the piston cylinder 23, which opens the second one-way valve 27. The titrant drips from the piston cylinder 23 into the stirring dish 9 through the liquid outlet pipe 25. This design ensures that the titrant is added accurately and continuously, and is quickly mixed by the magnetic stirrer 8 and the rotor 10, improving the mixing efficiency. As the transparent suction tube 19 descends with the lifting cylinder 18, the piston block 20 also descends until both ends of the piston block 20 are in contact with the upper surface of the mounting bracket 17. At this time, the mounting bracket 17 supports the piston block 20, causing the piston block 20 to move upward relative to the lifting cylinder 18. This generates a negative pressure in the lifting cylinder 18 and the transparent suction tube 19 through the sliding friction between the lifting cylinder 18 and the piston block 20. This allows the transparent suction tube 19 to draw the titrated liquid upward through its lower end inserted into the stirring dish 9, allowing light to pass through the titrated liquid. This also avoids the influence of the rotating vortex of the liquid in the stirring dish 9 on the light.

[0028] 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 titration stirring photometer, comprising a base (1), wherein an LED light source (2) is fixedly mounted on the upper surface of one end of the base (1), and a measuring photocell (3) is fixedly mounted on the upper surface of the other end of the base (1), a beam-splitting groove (5) is formed inside the upper surface of the middle section of the base (1), a lens (4) is fixedly connected to one end of the beam-splitting groove (5), a reference photocell (6) is fixedly mounted on the upper surface of the base (1) on one side of the beam-splitting groove (5), the beam-splitting groove (5) is penetrated by a semi-reflective mirror (7), a magnetic stirrer (8) is provided below one end of the base (1), and a stirring dish (9) is placed on the upper end of the magnetic stirrer (8), and a rotor (10) is placed inside the stirring dish (9), characterized in that: One end of the half-reflection half-transmission mirror (7) penetrates the outer surface of the base (1), and one end of the half-reflection half-transmission mirror (7) located outside the base (1) is fixedly connected with the mounting block (11), the outer surface of the base (1) on one side of the mounting block (11) is provided with the rotating anti-dropping plate (12), the lower surface of the base (1) is fixedly provided with the sliding cylinder (13), and one end of the sliding cylinder (13) towards the stirring dish (9) is provided with the sliding limiting plate (14), and the outer surface of the base (1) is provided with the mounting groove (15).

2. A titration-stirring photometer according to claim 1, characterized in that: The upper surface of the base (1) on which the mounting groove (15) is located is fixedly provided with the lifting electric push rod (16), and the upper surface of the base (1) on one side of the lifting electric push rod (16) towards the mounting groove (15) is fixedly provided with the mounting bracket (17), the upper end of the mounting bracket (17) is provided with the sliding lifting cylinder (18), and the lower end of the lifting cylinder (18) is fixedly connected with the transparent suction tube (19), the upper end of the lifting cylinder (18) is provided with the sliding piston block (20), the upper surface of the mounting bracket (17) is fixedly provided with the liquid storage tank (21), the outer surface of the lifting cylinder (18) on one side is provided with the accommodation groove (22), the lower surface of one end of the mounting bracket (17) is fixedly provided with the piston cylinder (23), and the liquid inlet pipe (24) is connected between one end of the piston cylinder (23) and the liquid storage tank (21), and the outer surface of one end of the piston cylinder (23) is provided with the liquid outlet pipe (25), the first one-way valve (26) is installed at the connection between the liquid inlet pipe (24) and the piston cylinder (23), the second one-way valve (27) is installed at the connection between the liquid outlet pipe (25) and the piston cylinder (23), and the piston rod (28) is installed at one end of the piston cylinder (23) towards the accommodation groove (22).

3. A titration-stirring photometer according to claim 1, characterized in that: The LED light source (2), the measuring photocell (3) and the lens (4) are on the same straight line, the split light groove (5) is designed in T shape, and one end of the split light groove (5) is provided opposite to the reference photocell (6), and the half-reflection half-transmission mirror (7) is arranged obliquely.

4. A titration-stirring photometer according to claim 1, characterized in that: The upper end of the stirring dish (9) is fitted with the inner side surface of the mounting groove (15), and the mounting groove (15) is designed in U shape.

5. A titration-stirring photometer according to claim 1, characterized in that: The anti-dropping plate (12) is designed as a circular plate with a section at one end, and the outer side surface of one end of the anti-dropping plate (12) is fitted with the outer side surface of the mounting block (11).

6. A titration-stirring photometer according to claim 1, characterized in that: The spring is connected between the sliding cylinder (13) and the limiting plate (14), the outer side surface of one end of the limiting plate (14) is fitted with the outer side surface of the stirring dish (9), and one end of the limiting plate (14) towards the opening of the mounting groove (15) is designed as an inclined surface.

7. A titration-stirring photometer according to claim 2, characterized in that: The lower end of the lifting cylinder (18) is communicated with the upper end of the transparent suction tube (19), and the upper end of the lifting cylinder (18) is connected with the piston block (20) in sliding friction.

8. A titration-stirring photometer according to claim 2, characterized in that: The piston block (20) is designed in E shape, and the spring is connected between the piston block (20) and the lifting cylinder (18).

9. A titration-stirring photometer according to claim 2, characterized in that: The accommodation groove (22) is designed in right trapezoidal shape, and the inclined surface of the accommodation groove (22) is arranged downward away from the piston cylinder (23).

10. A titration-stirring photometer according to claim 2, characterized in that: The piston rod (28) is in sliding friction connection with the piston cylinder (23), and a spring is connected between the piston rod (28) and the piston cylinder (23), and one end of the piston rod (28) located outside the piston cylinder (23) is attached to the outer surface of the lifting cylinder (18).

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