Measuring range switching cuvette measuring device and measuring method thereof

Abstract

The invention discloses a measuring range switching cuvette measuring device and a measuring method thereof, and belongs to the technical field of water quality monitoring equipment.The measuring range switching cuvette measuring device comprises a base, an optical module and a colorimetric module are arranged on the base, the optical module comprises a light source part and a light detector, and the light source part and the light detector are arranged on the two sides of the colorimetric module respectively; the base is provided with a colorimetric module, the colorimetric module comprises a cuvette body, a measuring area is arranged in the cuvette body, the measuring area at least has two different measuring ranges, the base is provided with a switching module, and the switching module is connected with the cuvette body. According to the cuvette measuring device, automatic range switching in the cuvette measuring device can be realized, disassembly and replacement are not needed, the step of range switching is simplified, meanwhile, the situation that a reagent and a to-be-measured liquid are left on the inner wall of the cuvette is avoided, the measuring error is reduced, and the measuring accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality monitoring equipment, and in particular to a range switching cuvette measuring device and a measuring method thereof. Background Art

[0002] In the prior art, colorimetry is a method for determining the content of a component by comparing or measuring the color depth of a colored substance solution. There are two commonly used colorimetry methods: visual colorimetry and photoelectric colorimetry, both of which are based on the Lambert-Beer law.

[0003] Colorimetry is an analytical method that determines the concentration or content of a substance in a solution or sample by measuring the color change.

[0004] In response to the above-mentioned related technologies, the applicant found that the colorimetric measuring devices used on the market must replace cuvette devices of different ranges to achieve range switching if the range needs to be switched. At the same time, the optical structural parts inside the cuvette device have high requirements for cleanliness, and the disassembly and replacement steps inside the cuvette device are also relatively cumbersome and complicated. If, during the disassembly and replacement process, the reagents and the test liquid enter the interior of the cuvette and remain on the inner wall of the cuvette, even in the case of a tiny amount of residue, it will cause measurement errors and affect the accuracy of the measurement. Summary of the Invention

[0005] In response to the deficiencies in the prior art, the present invention provides a range-switching cuvette measuring device and a measuring method thereof, which can realize automatic range switching inside the cuvette measuring device without the need for disassembly and replacement, thereby simplifying the steps of switching ranges and avoiding the occurrence of reagents and test liquids remaining on the inner wall of the cuvette, reducing measurement errors and thereby improving measurement accuracy.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A range-switching cuvette measuring device and a measuring method thereof include a base, wherein the base is provided with an optical module and a colorimetric module, the optical module includes a light source and a light detector, the light source and the light detector are respectively placed on both sides of the colorimetric module, the colorimetric module includes a cuvette body, a measuring area is defined inside the cuvette body, and the measuring area has at least two different measuring ranges, and a switching module is provided on the base, which is connected to the cuvette body.

[0008] Furthermore, the switching module is a rotating structure, the measuring area inside the cuvette body is arranged in a vertical even-numbered polygonal prism, the even-numbered polygonal prism has at least two different measuring ranges, and the switching module is rotatably connected to the cuvette body.

[0009] Furthermore, the switching module is a sliding structure, the measuring area inside the cuvette body is provided with at least two vertically arranged cuboids, each cuboid has at least two different measuring ranges, and the switching module is slidably connected to the cuvette body.

[0010] Furthermore, the switching module is a spiral structure, the measuring area inside the cuvette body is provided with at least two vertically arranged cuboids, each cuboid has at least two different measuring ranges, and the switching module is spirally connected to the cuvette body.

[0011] Furthermore, a positioning structure is provided on the cuvette body, and the cuvette body is positioned and matched with the cuvette upper seat or the cuvette lower seat through the positioning structure.

[0012] Furthermore, a heating resistor and a temperature sensor are provided on the cuvette body.

[0013] Furthermore, a magnetic stirring module is provided below the cuvette body.

[0014] Furthermore, the magnetic stirring module includes a magnetic stirring bar, a stirring area is provided below the measuring area of ​​the cuvette body, and the magnetic stirring bar is placed in the stirring area.

[0015] A measuring method for a range switching cuvette measuring device, comprising the following steps:

[0016] Step 1: According to the requirements of the liquid to be tested, switch the measurement range of the colorimetric module through the switching module;

[0017] Step 2: Positioning through the positioning structure on the cuvette body;

[0018] Step 3: Start the magnetic stirring module to stir the test solution so that the test solution and the components of the color developing reagent can quickly and fully complete the chemical reaction;

[0019] Step 4: Perform colorimetric measurement on the test liquid through the optical module.

[0020] In summary, compared with the prior art, the above technical solution has the following beneficial effects:

[0021] 1. The present application can realize the automatic switching of the measuring range inside the cuvette measuring device without the need for disassembly and replacement, thereby simplifying the steps of switching the measuring range and avoiding the occurrence of reagents and test liquids remaining on the inner wall of the cuvette, reducing measurement errors and thus improving measurement accuracy.

[0022] 2. This application can quickly and accurately switch the range without replacing the cuvettes of different ranges. Combined with the positioning structure, the positioning of the range switching operation is more precise and the measurement is more accurate.

[0023] 3. This application realizes real-time monitoring of automatic anti-fog through heating resistors and temperature sensors, and realizes automatic heating and anti-fog in the measurement area.

[0024] 4. This application makes cleaning and replacement of the optical module more convenient, and the addition of a magnetic stirring module makes the measurement more stable and more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the colorimetric module in Example 1 of the present invention;

[0027] Figure 3 2 is a front view of the colorimetric module in Example 1 of the present invention;

[0028] Figure 4 This is a diagram of the positioning structure of the base in Example 1 of the present invention;

[0029] Figure 5 This is a structural diagram of range switching state 1 in embodiment 1 of the present invention;

[0030] Figure 6 This is a structural diagram of range switching state 2 in embodiment 1 of the present invention;

[0031] Figure 7 This is a structural diagram of range switching state 1 in embodiment 2 of the present invention;

[0032] Figure 8 This is a structural diagram of range switching state 2 in embodiment 2 of the present invention;

[0033] Figure 9 This is a diagram of the positioning structure of the base in Example 2 of the present invention;

[0034] Figure 10 This is a diagram of the positioning structure of the cuvette body in Example 3 of the present invention.

[0035] Description of reference numerals:

[0036] 1. Base; 2. Liquid inlet seat; 3. Upper seat screw; 4. Liquid inlet plug; 5. Needle; 6. O-ring; 7. Upper sealing gasket; 8. Cuvette body; 9. Elastic plunger; 10. Photodetector; 11. Magnetic stirring bar; 12. Drain seat; 13. Lower seat screw; 14. Stepper motor; 15. Bevel gear A; 16. Magnet body; 17. Magnet mounting; 18. Stirring motor; 19. Set screw; 20. Bevel gear B; 21. Cuvette lower seat; 22. Lower sealing gasket; 23. Light source; 24. Cuvette upper seat. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below in conjunction with all the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0038] The embodiment of the present invention discloses a range switching cuvette measuring device and a measuring method thereof.

[0039] Example 1

[0040] Reference Figure 1 A range-switching cuvette measuring device primarily comprises an optical module, a colorimetric module, a switching module, and a magnetic stirring module. The device comprises a base 1, on which are mounted the optical and colorimetric modules. The optical module comprises a light source 23 and a light detector 10, which are positioned on either side of the colorimetric module.

[0041] Reference Figure 1 The colorimetric module includes a cuvette body 8, which defines a measurement area within the cuvette body 8. The measurement area has at least two different measurement ranges. The switching module is a rotating structure. The measurement area within the cuvette body 8 is arranged in a vertical even-numbered polygonal prism. The even-numbered polygonal prism has at least two different measurement ranges. The switching module is rotatably connected to the cuvette body 8.

[0042] Reference Figure 1 In this embodiment 1, the measuring area of ​​the cuvette body 8 is in the shape of a rectangular parallelepiped, and the measuring area is arranged vertically. The length and width of the rectangular parallelepiped are different measuring ranges respectively, and the measuring range can be quickly switched by rotating.

[0043] Reference Figure 1 and Figure 2 The cuvette body 8 is provided with a positioning structure, and the cuvette body 8 is positioned and matched with the cuvette upper seat 24 or the cuvette lower seat 21 through the positioning structure. The cuvette body 8 is also provided with a heating resistor and a temperature sensor.

[0044] Reference Figure 1 and Figure 2 The colorimetric module includes a liquid inlet seat 2, an upper seat screw 3, a liquid inlet plug 4, a needle 5, an O-ring 6, an upper sealing gasket 7, a cuvette body 8, a drain seat 12, a lower seat screw 13, a cuvette lower seat 21, a lower sealing gasket 22, and a cuvette upper seat 24.

[0045] Reference Figure 1 The base 1 is provided with a switching module, which is connected to the cuvette body 8. The switching module includes an elastic plunger 9, a stepping motor 14 (servo), a bevel gear A15, and a bevel gear B20.

[0046] Reference Figure 1A magnetic stirring module is provided below the cuvette body 8. The magnetic stirring module includes a magnetic stirrer 11. A stirring area is provided below the measurement area of ​​the cuvette body 8, and the magnetic stirrer 11 is placed within the stirring area. The magnetic stirring module includes the magnetic stirrer 11, a magnet body 16, a magnet mounting member 17, a stirring motor 18, and a set screw 19.

[0047] The present application can quickly and accurately realize range switching without replacing the cuvette body 8 of different ranges. Combined with the positioning structure, the positioning of the range switching operation is more accurate and the measurement is more precise.

[0048] Reference Figure 1 、 Figure 2 and Figure 3 The cuvette body 8 can be integral or split. The cuvette body 8 in this embodiment 1 is split, and is divided into a cuvette upper seat 24 and a cuvette lower seat 21, which are connected by an upper seat screw 3 and a lower seat screw 13 in the internal screw hole.

[0049] Reference Figure 1 、 Figure 2 and Figure 3 The interior of the cuvette body 8 is designed with a structure that cooperates with the internal area structure of the cuvette body 8 and the outer shape of the cuvette body 8. The measurement area is placed inside the cuvette body 8 to form the internal area structure of the cuvette body 8. The upper sealing gasket 7 and the lower sealing gasket 22 are respectively installed at the upper and lower ends of the cuvette body 8 to ensure the internal sealing between the cuvette body 8 and the cuvette upper seat 24 and the cuvette lower seat 21.

[0050] Reference Figure 1 、 Figure 2 and Figure 3 The cylindrical structure outside the cuvette upper seat 24 and the cuvette lower seat 21 cooperates with the cylindrical hole structure inside the base 1. The matching structure enables the colorimetric module to be better fixed on the base 1 as a whole and rotated by switching the module.

[0051] Reference Figure 1 、 Figure 2 and Figure 4 , the liquid inlet plug 4 is inserted into the upper end of the liquid inlet seat 2, and the O-ring 6 is used between the two to ensure sealing and installation positioning. The liquid inlet seat 2 is connected to the cuvette upper seat 24 by the upper seat screw 3, and an upper sealing gasket 7 is installed between the cuvette body 8 and the cuvette upper seat 24. The liquid inlet plug 4 is designed with two liquid inlet channels and an air channel. The reagent and the liquid to be tested enter the interior of the cuvette body 8 through the liquid inlet channel of the liquid inlet plug 4 and the needle 5. The needle 5 can play a titration role, avoid reagent residue, and ensure the accuracy of the reagent amount entering the interior of the cuvette body 8 to reach the reagent measurement area.

[0052] Reference Figure 1 、 Figure 2 and Figure 4 The drain seat 12 is connected to the cuvette lower seat 21 by a lower seat screw 13, and a lower sealing gasket 22 is installed between the two. The internal cavity of the drain seat 12, the internal cavity of the cuvette lower seat 21 and the internal cavity of the cuvette body 8 together constitute the reagent measurement area and the stirring area.

[0053] Reference Figure 1 、 Figure 2 and Figure 4 The drain seat 12 is designed with a drain channel, which is connected to an external pump or valve. When the reagent and the test liquid are injected, the external pump or valve is closed, and the drain channel is sealed. After the measurement is completed, the external pump or valve is opened, and the drain channel is opened to discharge the reagent and the test liquid.

[0054] Reference Figure 1 The stepper motor 14 (servo) drives the bevel gear A15 to rotate the bevel gear B20. The bevel gear B20 is connected to the drain seat 12 and drives the entire colorimetric module to rotate clockwise and counterclockwise in the cylindrical hole structure of the base 1.

[0055] Reference Figure 1 、 Figure 3 and Figure 4 The bottom surface of the steps of the upper seat 24 of the cuvette is designed with positioning ball holes, which are evenly distributed on the plane. The upper end of the base 1 is equipped with an elastic plunger 9, which cooperates with the positioning ball holes on the bottom surface of the steps of the upper seat 24 of the cuvette to position the entire colorimetric module. When the switching module drives the colorimetric module to rotate clockwise or counterclockwise on the base 1, the elastic plunger 9 is compressed and disengages the positioning ball holes. When the colorimetric module is rotated to a specified angle, the elastic plunger 9 will enter the positioning ball holes at the corresponding angular positions to achieve the positioning effect. In addition, the lower seat 21 of the cuvette is designed with a positioning area structure, and the lower end of the base 1 is equipped with a positioning pin. The positioning pin cooperates with the positioning area structure on the lower seat 21 of the cuvette to control the angular range of clockwise and counterclockwise rotation of the entire colorimetric unit assembly. The elastic plunger 9 cooperates with the positioning ball holes, and the positioning pin cooperates with the positioning area structure on the lower seat 21 of the cuvette, so that the rotation angle and position of the entire colorimetric module can be more accurate.

[0056] Reference Figure 1 、 Figure 3 and Figure 4The cuvette body 8 is made of metal, and a heating resistor and a temperature sensor are installed on the cuvette body 8. When the temperature sensor detects that the temperature of the measuring area of ​​the cuvette is lower than the set value, the control circuit automatically controls the heating resistor through software to increase the temperature of the measuring area of ​​the cuvette, thereby preventing condensation on the surface of the cuvette and affecting the measurement, thereby achieving a demisting function. Regardless of changes in ambient temperature or temperature of the test liquid, the cuvette will not be fogged, thus achieving stable and accurate measurement. The present application realizes real-time monitoring of automatic anti-fogging through the heating resistor and the temperature sensor, and realizes automatic heating and anti-fogging of the measuring area.

[0057] Reference Figure 1 、 Figure 5 and Figure 6 When the light waves emitted by the light source component 23 pass through the light source optical cavity A of the cuvette upper seat 24, the stepped structure of the optical cavity reduces the diameter of the emitted light without losing effective light energy, thereby reducing the impact of stray light on the measurement. After passing through the light source optical cavity, the light then passes through the cuvette body 8 and enters the measurement area of ​​the reagent, irradiating the test liquid. Different concentrations of the test liquid will produce different absorption intensities for the detection light. After being absorbed by the test liquid, the detection light enters the detection optical cavity A and is received by the light detector 10. The concentration of the test liquid is calculated based on the residual light intensity of the detection light received by the light detector 10. After passing through the test liquid, the light enters the detection optical cavity A and is received by the light detector 10. When the range is switched, the colorimetric module rotates a fixed angle, and the light source is aligned with the light source optical cavity B of the cuvette upper seat 24. At the same time, the light detector 10 is aligned with the detection optical cavity B of the cuvette upper seat 24. After the switching action is completed and the positioning structure ensures the alignment of the optical path, optical measurement is performed.

[0058] For different measuring ranges, the length and other dimensions of the light source cavity A and the light source cavity B, and the detection cavity A and the detection cavity B are adjusted according to the wavelength of light to ensure measurement accuracy.

[0059] Reference Figure 1 The magnetic stirring module is located below the colorimetric module and primarily consists of a stirring motor 18, magnet bodies 16, magnet mountings 17, set screws 19, and a magnetic stirring bar 11. The south and north poles of the two magnet bodies 16 are mounted in the magnet mountings 17 relative to each other and are secured to the stirring motor 18 via set screws 19. Electrical signals control the stirring motor 18's forward and reverse rotation, driving the magnet bodies 16 to rotate and generate a magnetic field.

[0060] Reference Figure 1, below the cuvette body 8, the cavity structure composed of the cuvette lower seat 21 and the liquid drain seat 12 is called the stirring area, and a magnetic stirrer 11 is built in this area. The magnetic stirrer 11 rotates under the action of the magnetic field formed by the rotation of the magnet body 16 of the magnetic stirring module, thereby stirring the liquid to be tested inside the cuvette body 8, so that the liquid to be tested and the components of the color developing reagent quickly and fully complete the chemical reaction and reach a stable water sample color state, while eliminating the interference of bubbles in the liquid, making the measurement more accurate. This application makes it more convenient to clean and replace the optical module, and coupled with the magnetic stirring module, the measurement is more stable and the accuracy is higher.

[0061] The present application can realize the internal automatic switching of the range of the cuvette measuring device without the need for disassembly and replacement, thereby simplifying the steps of switching the range and avoiding the occurrence of reagents and test liquids remaining on the inner wall of the cuvette, reducing measurement errors and thus improving measurement accuracy.

[0062] Example 2

[0063] Reference Figure 1 、 Figure 7 and Figure 8 The difference between this embodiment and embodiment 1 lies in the switching module and the colorimetric module. The switching module is a sliding structure. The measuring area inside the cuvette body 8 is provided with at least two vertically arranged rectangular blocks. Each rectangular block has at least two different measuring ranges. The switching module is slidably connected to the cuvette body 8.

[0064] Reference Figure 1 、 Figure 7 、 Figure 8 and Figure 9 In Example 2, the switching module is a linear sliding switching structure, and the cuvette body 8 in the colorimetric module is a special-shaped cuvette with two range cuvettes arranged up and down. Correspondingly, the cuvette body 8 also has two sets of optical path structures: light source cavity A, detection cavity A and light source cavity B, detection cavity B. The base 1 and the cuvette body 8 rely on a linear groove structure as a track for linear movement. After the two move relative to each other, the light source cavity and the detection cavity can be switched to align with the light source component 23 and the light detector 10 respectively, and reach the corresponding test positions respectively. The above-mentioned two test positions are positioned by the positioning structure. When the above-mentioned light source cavity and detection cavity are moved to the test positions respectively, the positioning pin is inserted into the positioning hole to achieve the positioning effect.

[0065] Example 3

[0066] Reference Figure 1 and Figure 10The difference between this embodiment and embodiment 1 lies in the switching module and the colorimetric module. The switching module is a spiral structure. The measuring area inside the cuvette body 8 is provided with at least two vertically arranged rectangular blocks. Each rectangular block has at least two different measuring ranges. The switching module is spirally connected to the cuvette body 8.

[0067] Reference Figure 1 and Figure 10 In Example 3, the switching module utilizes a spiral lift switching structure. The cuvette body 8 and base 1 perform spiral lift relative motion within a spiral groove in base 1 via a boss on the cuvette body 8. The spiral groove is terminated by two platform structures, each of which represents the two test positions. When the boss reaches the test position, the light source aperture and detection aperture on base 1 align with the light source component 23 and light detector 10, respectively, as well as the light source and detection cavities on the cuvette body 8. Positioning is then performed using the positioning structure, thereby achieving the purpose of switching the measuring range.

[0068] In summary, in combination with the above embodiments 1 / 2 / 3, a measuring method for a range switching cuvette measuring device is obtained, comprising the following steps:

[0069] Step 1: According to the requirements of the liquid to be tested, switch the measurement range of the colorimetric module through the switching module;

[0070] Step 2: Positioning through the positioning structure on the cuvette body 8;

[0071] Step 3: Start the magnetic stirring module to stir the test solution so that the test solution and the components of the color developing reagent can quickly and fully complete the chemical reaction;

[0072] Step 4: Perform colorimetric measurement on the test liquid through the optical module.

[0073] The implementation principles of a range switching cuvette measuring device and a measuring method thereof according to an embodiment of the present invention are as follows:

[0074] First, according to the requirements of the test liquid, the measurement range of the colorimetric module is switched through the switching module, and then the positioning structure on the cuvette body 8 is used to position it. After that, the magnetic stirring module is started to stir the test liquid, so that the test liquid and the components of the color developing reagent can quickly and fully complete the chemical reaction. Finally, the test liquid is measured by colorimetry through the optical module.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A range switching cuvette measuring device and a measuring method thereof, characterized in that: The invention comprises a base (1), wherein an optical module and a colorimetric module are provided on the base (1), wherein the optical module comprises a light source (23) and a light detector (10), wherein the light source (23) and the light detector (10) are respectively placed on both sides of the colorimetric module, wherein the colorimetric module comprises a cuvette body (8), wherein a measuring area is provided inside the cuvette body (8), and the measuring area has at least two different measuring ranges, and wherein a switching module is provided on the base (1), and the switching module is connected to the cuvette body (8).

2. The range switching cuvette measuring device and measuring method thereof according to claim 1, characterized in that: The switching module is a rotating structure. The measuring area inside the cuvette body (8) is arranged in a vertical even-numbered polygonal prism. The even-numbered polygonal prism has at least two different measuring ranges. The switching module is rotatably connected to the cuvette body (8).

3. The range switching cuvette measuring device and the measuring method thereof according to claim 1, characterized in that: The switching module is a sliding structure. The measuring area inside the cuvette body (8) is provided with at least two vertically combined cuboids. Each cuboid has at least two different measuring ranges. The switching module is slidably connected to the cuvette body (8).

4. The range switching cuvette measuring device and the measuring method thereof according to claim 1, characterized in that: The switching module is a spiral structure. The measuring area inside the cuvette body (8) is provided with at least two vertically combined cuboids. Each cuboid has at least two different measuring ranges. The switching module is spirally connected to the cuvette body (8).

5. The range switching cuvette measuring device and measuring method thereof according to claim 1, characterized in that: The cuvette body (8) is provided with a positioning structure, and the cuvette body (8) is positioned and matched with the cuvette upper seat (24) or the cuvette lower seat (21) through the positioning structure.

6. The range switching cuvette measuring device and the measuring method thereof according to claim 1, characterized in that: The cuvette body (8) is provided with a heating resistor and a temperature sensor.

7. The range switching cuvette measuring device and the measuring method thereof according to claim 1, characterized in that: A magnetic stirring module is provided below the cuvette body (8).

8. The range switching cuvette measuring device and the measuring method thereof according to claim 7, characterized in that: The magnetic stirring module comprises a magnetic stirring bar (11), a stirring area is provided below the measuring area of ​​the cuvette body (8), and the magnetic stirring bar (11) is placed in the stirring area.

9. A measuring method based on a range switching cuvette measuring device according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: According to the requirements of the liquid to be tested, switch the measurement range of the colorimetric module through the switching module; Step 2: Positioning through the positioning structure on the cuvette body (8); Step 3: Start the magnetic stirring module to stir the test solution so that the test solution and the components of the color developing reagent can quickly and fully complete the chemical reaction; Step 4: Perform colorimetric measurement on the test liquid through the optical module.

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