Photoelectric colorimetric device
By employing a dual-optical-path structure and differential processing technology, the problems of accuracy and efficiency in photoelectric colorimetric devices in industrial settings have been solved, enabling efficient and low-cost online monitoring.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 国投检测科技(山东)有限公司
- Filing Date
- 2025-04-27
- Publication Date
- 2026-04-21
AI Technical Summary
Existing photoelectric colorimetric devices suffer from inaccurate test results due to changes in the refractive index of the spectrometer film and contamination issues caused by vibration and temperature fluctuations in industrial settings. Furthermore, these devices are inefficient and costly.
It adopts a dual-optical-path structure, using a light source and two identical photodetectors to detect transmitted light and reference light respectively. Differential processing is used to eliminate the influence of temperature changes. Combined with a flexible and adjustable optical path design and temperature regulation mechanism, it eliminates the need for traditional beam splitting elements and fiber optic transmission systems.
It improves detection accuracy, reduces mechanical complexity and maintenance costs, is applicable to a variety of solution systems, and enables long-term continuous online monitoring.
Smart Images
Figure CN224152343U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of online detection equipment for inorganic petrochemicals, and specifically to a photoelectric colorimetric device. Background Technology
[0002] Colorimetry is a widely used detection method in in-situ analytical instruments. Its detection principle is based on quantitative analysis of light absorption following a colorimetric reaction. When the analyte reacts with a colorimetric reagent under specific conditions, it forms a colored compound with a characteristic absorption spectrum. When incident light of a specific wavelength passes through the solution, the intensity of the transmitted light decreases quantitatively due to absorption by the colored compound. According to the Lambert-Beer Law, the intensity of transmitted light is linearly correlated with the solution concentration. This method uses a photoelectric sensor to accurately measure the intensity of transmitted light, establishes a standard curve between the degree of transmission light attenuation and the concentration of the analyte, and achieves quantitative analysis of the concentration of the analyte through mathematical modeling.
[0003] The key to colorimetric methods lies in their implementation using photoelectric colorimetric devices, which mainly include a light source, a reaction cell, and a receiver. Most current photoelectric colorimetric devices use LEDs as the light source and employ a beam splitter to separate the incident light into transmitted and reference light. These transmitted and reference light are then received and transmitted to the testing personnel via an optical fiber transmission system for monitoring and analysis. However, under the long-term vibration and temperature fluctuations of industrial environments, the refractive index of the beam splitter's film may change, or the overall structure of the beam splitter may shift, causing variations in the optical thickness of its film and resulting in wavelength drift, affecting the accuracy of the test results. Furthermore, the beam splitter is susceptible to contamination and oxidation due to complex environments (such as high humidity, dust, and corrosive gases), leading to problems such as light source attenuation and optical path shift. This necessitates frequent optical path calibration by personnel, resulting in low testing efficiency and significantly increased testing costs. Utility Model Content
[0004] To address the problems in the background technology, reduce the impact of external factors on detection, and ensure the accuracy of detection results, this utility model proposes a photoelectric colorimetric device, including a reaction cell and a housing. A light source mounting shell and a first mounting shell are connected to both sides of the housing via vertical adjustment mechanisms. The light source mounting shell and the first mounting shell are respectively provided with a first channel and a second channel communicating with the interior of the housing. The first channel and the second channel are coaxially arranged. A light source is provided in the first channel, and a first photodetector is provided in the second channel. A second photodetector is provided between the light source and the housing. The first photodetector and the second photodetector are two identical photodetectors. The detection end of the second photodetector is connected to the first channel. The reaction cell is fixed inside the housing and located between the first channel and the second channel. A heating wire is provided on the outside of the reaction cell.
[0005] Preferably, the vertical adjustment mechanism includes a movable plate and an adjusting bolt. The movable plate is provided with a mounting hole and an adjusting hole. There are two adjusting holes, which are located on both sides of the mounting hole. The adjusting holes are elongated holes arranged vertically along the length direction.
[0006] The housing has movable openings on both sides, and bolt holes are provided on the housing on both sides of the movable openings. The movable plates of the two vertical adjustment mechanisms are located on both sides of the housing. The movable openings correspond to the mounting holes, and the bolt holes correspond to the adjustment holes. The head diameter of the adjustment bolt is larger than the radial dimension of the adjustment hole, and the shank of the adjustment bolt passes through the adjustment hole and is threaded into the threaded hole.
[0007] The first mounting shell and the light source mounting shell are respectively located on the side of the two movable plates away from the housing. The first channel and the second channel are respectively connected to the inside of the housing through their respective mounting holes and movable openings.
[0008] Preferably, the light source mounting housing includes a first connector, a light source adjustment housing, a second adjustment housing, and a fixing block. The first connector is fixedly connected to its corresponding movable plate. One end of the first connector extends into the housing through a mounting hole and a movable opening. The other end of the first connector is located on the side of the movable plate away from the housing and is fixedly connected to one end of the fixing block. The other end of the fixing block is provided with a third mounting groove, and the third mounting groove is provided with a third internal thread. One end of the light source adjustment housing is provided with a third external thread that matches the third internal thread. The light source adjustment housing is threadedly connected to the fixing block through the cooperation of the third internal thread and the third external thread. The first channel is disposed in the first connector, the fixing block, and the light source adjustment housing, and the light source is disposed in the first channel of the light source adjustment housing.
[0009] The fixed block is provided with a fourth mounting groove on one side, which is connected to the first channel. The fourth mounting groove is provided with a fourth internal thread. The second adjusting shell is provided with a fourth external thread that matches the fourth internal thread at one end. The second adjusting shell is threadedly connected to the fixed block through the cooperation of the fourth internal thread and the fourth external thread. The second photodetector is set on the second adjusting shell, and the detection end of the second photodetector is located at the end of the second adjusting shell closer to the first channel.
[0010] The third internal thread is aligned with the axis of the first channel, and the axis of the fourth internal thread is perpendicular to the axis of the first channel.
[0011] Preferably, the first mounting shell includes a second connector and a first adjusting shell. The second connector is fixedly connected to its corresponding movable plate. One end of the second connector extends into the shell through a mounting hole and a movable opening. The other end of the second connector is located on the side of the movable plate away from the shell and is provided with a first mounting groove. The first mounting groove communicates with the second channel. The first mounting groove is provided with a first internal thread. One end of the first adjusting shell is provided with a first external thread that matches the first internal thread. The first adjusting shell is threadedly connected to the second connector through the cooperation of the first internal thread and the first external thread. The second channel is disposed in the second connector. The first photodetector is disposed on the first adjusting shell. The detection end of the first photodetector is located at the end of the first adjusting shell near the second channel.
[0012] The direction of the first internal thread axis is consistent with the direction of the second channel axis.
[0013] Preferably, a fan is provided on one side of the housing, the output end of the fan is connected to the inside of the housing, and the fan is positioned corresponding to the reaction tank.
[0014] Preferably, a temperature sensor is fixed to the outer wall of the reaction tank.
[0015] Preferably, the heating wire is wound around the outer wall of the reaction tank, and the winding density of the heating wire in the upper part of the reaction tank is less than that in the lower part of the reaction tank.
[0016] Preferably, both the first photodetector and the second photodetector are silicon photovoltaic cells.
[0017] Preferably, the reaction tank includes an upper port and a lower port, and the diameter of the upper port of the reaction tank is larger than the diameter of the lower port of the reaction tank.
[0018] Preferably, the diameter of the first channel is smaller than the diameter of the second channel.
[0019] The beneficial effects of this utility model are as follows:
[0020] 1. This application employs a dual-optical-path structure, utilizing a single light source to emit light. A second photodetector receives and detects the reference light through a first channel, while a first photodetector receives and detects the transmitted light through a second channel. This eliminates the need for a beam splitter, minimizing the impact of external environmental factors on the light emission. Furthermore, since both photodetectors are identical, their current changes are identical under temperature variations, allowing differential processing to eliminate the effects of temperature changes. This invention eliminates the need for traditional beam splitters and fiber optic transmission systems, resulting in a simpler overall structure, reduced mechanical complexity, and effective compensation for detection errors caused by external factors. This invention updates the reference and transmitted light intensities in real-time for each detection, eliminating systematic errors introduced by environmental fluctuations (such as temperature drift and light source attenuation) and improving detection accuracy.
[0021] 2. This application adopts a flexible and adjustable optical path design, that is, the vertical displacement of the light source and the photodetector is adjustable. It can adjust the position of the light source and the photodetector according to the solution with different refractive indices to ensure that the transmitted light is received by the first photodetector. It is suitable for a variety of solution systems. Moreover, the optical signal utilization rate is high and the maintenance cost is low, making it suitable for long-term continuous online monitoring under harsh working conditions.
[0022] 3. The reaction temperature of this application is controllable and integrates a dual-mode temperature regulation mechanism, namely a variable temperature mechanism that uses heating wire for uniform heating and fan for forced convection cooling, which effectively shortens the detection time.
[0023] 4. This application adopts an integrated modular design, in which each functional module can be flexibly assembled into one unit and is easy to disassemble, thereby facilitating installation, inspection and maintenance. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0025] Figure 2 This is a side sectional view of the present invention;
[0026] Figure 3 This is a schematic diagram of the movable plate structure of this utility model;
[0027] Figure 4 This is a schematic diagram of the shell structure of this utility model;
[0028] Figure 5 This is a schematic diagram of the reaction tank structure of this utility model.
[0029] Labels in the diagram: 1. Housing; 2. Moving plate; 3. First connecting piece; 4. Fixing block; 5. Light source adjustment housing; 6. Second adjustment housing; 7. Fan; 8. First adjustment housing; 9. Reaction tank; 10. Heating wire; 11. Temperature sensor; 12. Light source; 13. Second photodetector; 14. First channel; 15. Second connecting piece; 16. First photodetector; 17. Second channel; 18. Moving port; 19. Bolt hole; 20. Adjustment hole; 21. Mounting hole; 22. Stainless steel fastener; 23. Connector. Detailed Implementation
[0030] To make this utility model clearer and more understandable, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the given embodiments are only one of the implementation methods and do not represent all embodiments.
[0031] In this article, terms such as "inner," "outer," "upper," and "lower" are established based on the positional relationships shown in the attached drawings. Depending on the attached drawings, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection.
[0032] Combined with appendix Figure 1 -Appendix Figure 5 A photoelectric colorimetric device includes a reaction cell 9 and a housing 1. A light source 12 mounting shell and a first mounting shell are connected to both sides of the housing 1 via vertical adjustment mechanisms. The light source 12 mounting shell and the first mounting shell are respectively provided with a first channel 14 and a second channel 17 communicating with the interior of the housing 1. The first channel 14 and the second channel 17 are coaxially arranged. A light source 12 is disposed in the first channel 14, and a first photodetector 16 is disposed in the second channel 17. A second photodetector 13 is disposed between the light source 12 and the housing 1. The first photodetector 16 and the second photodetector 13 are two identical photodetectors with identical performance parameters. The detection end of the second photodetector 13 is connected to the first channel 14, meaning the detection end of the second photodetector 13 is located on one side of the first channel 14. Light emitted by the light source 12 can be detected by the second photodetector 13 after entering the first channel 14. The reaction cell 9 is fixed inside the housing 1 and is located between the first channel 14 and the second channel 17. A heating wire 10 is disposed on the outside of the reaction cell 9. The first photodetector 16 is used to receive the transmitted light after passing through the reaction cell 9 and measure the intensity of the transmitted light. The second photodetector 13 is used to receive the light before entering the reaction cell 9 and measure the intensity of the reference light.
[0033] Specifically, the housing 1 adopts a completely black, light-shielding design, i.e., it is made of black sheet metal, and except for necessary openings (such as the mounting location of the fan 7 and the fixing location of the reaction cell 9), it is a closed structure, which greatly reduces the interference of ambient light on the solution color, while enhancing color contrast and helping to improve the accuracy of colorimetric analysis. At the same time, for light-sensitive samples, complete black-shielding reduces light damage, extending the sample's stability and lifespan. The housing 1 has mounting screw holes at both the top and bottom, with stainless steel fasteners 22 fixed in the internal threads of the mounting screw holes. The upper and lower ends of the reaction cell 9 are respectively secured to the stainless steel fasteners 22 via polytetrafluoroethylene connectors 23. The light source 12 uses an LED light source to provide incident light of a specific wavelength for colorimetric analysis. Both the first photodetector 16 and the second photodetector 13 use silicon photocells, and the two silicon photocells have identical performance parameters. The silicon photocells can convert light signals into electrical signals to measure the reference light intensity and transmitted light intensity. Meanwhile, when the external ambient temperature changes, the current changes of the two silicon photovoltaic cells have the same trend, and the influence of temperature changes can be eliminated by differential processing; when the light intensity emitted by the light source 12 fluctuates, the two silicon photovoltaic cells will also produce the same current change trend, so that the light signal change amplitude of the reference light path and the transmission light path is consistent, and after differential processing, it will not have a substantial impact on the final detection result.
[0034] Differential processing is a signal processing technique used to eliminate common variations in two signals. For example, when temperature changes, subtracting the current signals of two silicon photovoltaic cells can eliminate the effects of temperature changes, resulting in a more stable output signal.
[0035] Specifically, the vertical adjustment mechanism includes a movable plate 2 and an adjusting bolt. The movable plate 2 is provided with a mounting hole 21 and an adjusting hole 20. There are two adjusting holes 20, which are located on both sides of the mounting hole 21. The adjusting hole 20 is an elongated hole arranged vertically along the length direction.
[0036] The housing 1 has movable openings 18 on both sides, and bolt holes 19 on both sides of the housing 1. The movable plates 2 of the two vertical adjustment mechanisms are located on both sides of the housing 1. The movable openings 18 correspond to the mounting holes 21, and the bolt holes 19 correspond to the adjustment holes 20. The head diameter of the adjustment bolt is larger than the radial dimension of the adjustment hole 20, and the shank of the adjustment bolt passes through the adjustment hole 20 and is threaded into the threaded hole.
[0037] The first mounting shell and the light source 12 mounting shell are respectively located on the side of the two movable plates 2 away from the shell 1.
[0038] Tightening the adjusting bolt fixes the moving plate 2 relative to the housing 1. Loosening the adjusting bolt allows the moving plate 2 to move relative to the housing 1. Since the adjusting hole 20 is an elongated hole, when the moving plate 2 moves up and down, the bolt hole 19 and the adjusting bolt can move relative to the moving plate 2 along the elongated hole. Thus, when the moving plate 2 moves up or down a certain distance, it can still be fixed relative to the housing 1 by the adjusting bolt, achieving the vertical adjustment function. The vertical adjustability of the light source 12, the first photodetector 16, and the second photodetector 13 through the vertical adjustment mechanism facilitates the adjustment of the positions of the light source 12 and the photodetector, ensuring the collimated emission of the light source 12 and the accurate reception of light by the photodetector, thereby improving the accuracy of detection. At the same time, due to the different types or concentrations of solutions, the refractive index of the solution is also different. The refractive index affects the emission direction of the transmitted light. Vertical adjustment ensures that the transmitted light is received by the first photodetector 16, which is applicable to solution systems with different refractive indices and effectively reduces the interference of solution flow on the light path.
[0039] Specifically, the mounting housing of the light source 12 includes a first connecting member 3, a light source adjustment housing 5, a second adjustment housing 6, and a fixing block 4. The first connecting member 3 is fixedly connected to its corresponding moving plate 2. One end of the first connecting member 3 extends into the housing 1 through the mounting hole 21 and the moving opening 18. The other end of the first connecting member 3 is located on the side of the moving plate 2 away from the housing 1 and is fixedly connected to one end of the fixing block 4. The other end of the fixing block 4 is provided with a third mounting groove, and the third mounting groove is provided with a third internal thread. One end of the light source adjustment housing 5 is provided with a third external thread that matches the third internal thread. The light source adjustment housing 5 is threadedly connected to the fixing block 4 through the cooperation of the third internal thread and the third external thread. The first channel 14 is provided in the first connecting member 3, the fixing block 4, and the light source adjustment housing 5. The light source 12 is provided in the first channel 14 of the light source adjustment housing 5.
[0040] The fixing block 4 has a fourth mounting groove on one side, which is connected to the first channel 14. The fourth mounting groove has a fourth internal thread. The second adjusting shell 6 has a fourth external thread that matches the fourth internal thread at one end. The second adjusting shell 6 is threadedly connected to the fixing block 4 through the cooperation of the fourth internal thread and the fourth external thread. The second photodetector 13 is disposed on the second adjusting shell 6, and the detection end of the second photodetector 13 is located at the end of the second adjusting shell 6 near the first channel 14. More specifically, the second photodetector 13 is a silicon photovoltaic cell, which is fixed at the end of the second adjusting shell 6 near the first channel 14.
[0041] More specifically, the fixing block 4 and the first connecting member 3 are fixedly connected by threads. The first connecting member 3 has a second mounting groove at one end near the fixing block 4. The second mounting groove has a second internal thread. One end of the fixing block 4 has a second external thread that matches the second internal thread. The fixing block 4 is threadedly connected to the first connecting member 3 through the cooperation of the second internal thread and the second external thread.
[0042] The second internal thread and the third internal thread are aligned with the axis of the first channel 14, and the axis of the fourth internal thread is perpendicular to the axis of the first channel 14.
[0043] Twisting the light source adjustment housing 5 moves the light source 12 closer to or further away from the reaction cell 9, adjusting the intensity of the light emitted by the light source 12. Twisting the second adjustment housing 6 moves the second photodetector 13 closer to or further away from the light source 12, ensuring that the light intensity received by the second photodetector 13 is within the required range. When the transmittance of the sample solutions varies greatly (e.g., high-concentration samples have low transmittance, and low-concentration samples have high transmittance), adjusting the light intensity can prevent the silicon photocell from saturating due to excessive light intensity or being overwhelmed by noise due to insufficient light intensity, ensuring that the optical and electrical signals are within the linear response range under different solution concentrations, thus improving measurement accuracy. It can also prevent the silicon photocell from overloading due to excessive light intensity, extending the equipment lifespan.
[0044] Specifically, the first mounting shell includes a second connector 15 and a first adjusting shell 8. The second connector 15 is fixedly connected to its corresponding movable plate 2. One end of the second connector 15 extends into the shell 1 through the mounting hole 21 and the movable opening 18. The other end of the second connector 15 is located on the side of the movable plate 2 away from the shell 1 and is provided with a first mounting groove. The first mounting groove communicates with the second channel 17. The first mounting groove is provided with a first internal thread. One end of the first adjusting shell 8 is provided with a first external thread that matches the first internal thread. The first adjusting shell 8 is threadedly connected to the second connector 15 through the cooperation of the first internal thread and the first external thread. The second channel 17 is disposed in the second connector 15. The first photodetector 16 is disposed on the first adjusting shell 8. The detection end of the first photodetector 16 is located at the end of the first adjusting shell 8 near the second channel 17. More specifically, the first photodetector 16 is a silicon photovoltaic cell, which is fixed to the end of the first adjusting shell 8 near the second channel 17.
[0045] The axis of the first internal thread is aligned with the axis of the second channel 17. By turning the first adjusting shell 8, the first photodetector 16 can be moved closer to or further away from the reaction cell 9, thus adjusting the light intensity that the first photodetector 16 can receive.
[0046] Specifically, a fan 7 is provided on one side of the housing 1, and the output end of the fan 7 is connected to the interior of the housing 1. The fan 7 corresponds to the position of the reaction cell 9. For substances that need to be cooled to room temperature before detection, the fan 7 can accelerate the cooling of the reaction cell 9, reduce the cooling time required during detection, and thus improve detection efficiency. More specifically, there are two fans 7, arranged vertically.
[0047] Specifically, a temperature sensor 11 is fixed to the outer wall of the reaction tank 9 to monitor the internal temperature of the reaction tank 9 in real time.
[0048] Specifically, the heating wire 10 is wound around the outer wall of the reaction tank 9, with the winding density of the heating wire 10 in the upper part of the reaction tank 9 being lower than that in the lower part. The lower winding density of the heating wire 10 in the upper part of the reaction tank 9 allows for uncovered areas within the reaction tank 9, facilitating the transmission of incident light. The higher winding density of the heating wire 10 in the lower part of the reaction tank 9 enables a more uniform distribution of heat flow, improving heating efficiency.
[0049] Specifically, the reaction tank 9 includes an upper port and a lower port, with the diameter of the upper port being larger than that of the lower port. The larger diameter of the upper port allows for greater liquid capacity, preventing overflow caused by sudden volume changes due to thermal expansion and contraction. The lower port is used for sample injection and waste discharge, with the injection and discharge paths separated by a multi-port valve. The smaller diameter of the lower port allows for connection to a valve-pump system via a small-diameter pipe, enabling precise sample injection by controlling the flow rate. Furthermore, during waste discharge, the waste liquid output path is centralized, preventing waste liquid residue or splashing into the reaction zone.
[0050] Specifically, the diameter of the first channel 14 is smaller than the diameter of the second channel 17, which facilitates the first photodetector 16 in receiving transmitted light.
[0051] Some testing reagents contain strong acids and alkalis, requiring the reaction cell 9 to be made of acid-resistant, heat-resistant, and high-pressure-resistant materials. Therefore, the reaction cell 9 is made of quartz material, and the connecting parts 23 at the upper and lower ends of the reaction cell 9 are made of polytetrafluoroethylene.
[0052] Specifically, it also includes a controller, which is connected to the light source 12, the first photodetector 16, the second photodetector 13, the fan 7, the heating wire 10, and the temperature sensor 11. The controller controls the operation of each device and receives and processes the detection data. For example, the controller controls the start and stop of the fan 7 and its operating time, and receives signals transmitted from the photodetectors. Using a controller for device control and data reception and processing is a conventional technique and will not be elaborated upon here.
[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will be able to make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A photoelectric colorimetric device, characterized by: The device includes a reaction tank (9) and a housing (1). The housing (1) is connected to a light source (12) mounting shell and a first mounting shell on both sides by a vertical adjustment mechanism. The light source (12) mounting shell and the first mounting shell are respectively provided with a first channel (14) and a second channel (17) communicating with the inside of the housing (1). The first channel (14) and the second channel (17) are coaxially arranged. The first channel (14) is provided with a light source (12), and the second channel (17) is provided with a first photodetector (16). A second photodetector (13) is provided between the light source (12) and the housing (1). The first photodetector (16) and the second photodetector (13) are two identical photodetectors. The detection end of the second photodetector (13) is connected to the first channel (14). The reaction tank (9) is fixed inside the housing (1) and the reaction tank (9) is located between the first channel (14) and the second channel (17). A heating wire (10) is provided on the outside of the reaction tank (9).
2. A photoelectric colorimetric device according to claim 1, characterized in that: The vertical adjustment mechanism includes a movable plate (2) and an adjusting bolt. The movable plate (2) is provided with a mounting hole (21) and an adjusting hole (20). There are two adjusting holes (20), which are located on both sides of the mounting hole (21). The adjusting hole (20) is an elongated hole arranged vertically along the length direction. The housing (1) is provided with movable openings (18) on both sides, and bolt holes (19) are provided on the housing (1) on both sides of the movable openings (18). The movable plates (2) of the two vertical adjustment mechanisms are located on both sides of the housing (1). The movable openings (18) correspond to the mounting holes (21), and the bolt holes (19) correspond to the adjustment holes (20). The head diameter of the adjustment bolt is larger than the radial dimension of the adjustment hole (20), and the rod of the adjustment bolt passes through the adjustment hole (20) and is threaded to the threaded hole. The first mounting shell and the light source (12) mounting shell are respectively located on the side of the two movable plates (2) away from the shell (1).
3. A photoelectric colorimetric device according to claim 2, characterized in that: The mounting shell of the light source (12) includes a first connector (3), a light source adjustment shell (5), a second adjustment shell (6), and a fixing block (4). The first connector (3) is fixedly connected to its corresponding moving plate (2). One end of the first connector (3) extends into the shell (1) through the mounting hole (21) and the moving opening (18). The other end of the first connector (3) is located on the side of the moving plate (2) away from the shell (1) and is fixedly connected to one end of the fixing block (4). The other end of the fixing block (4) is provided with a third mounting groove. The third mounting groove is provided with a third internal thread. One end of the light source adjustment shell (5) is provided with a third external thread that matches the third internal thread. The light source adjustment shell (5) is threadedly connected to the fixing block (4) through the cooperation of the third internal thread and the third external thread. The first channel (14) is provided in the first connector (3), the fixing block (4), and the light source adjustment shell (5). The light source (12) is provided in the first channel (14) of the light source adjustment shell (5). The fixing block (4) has a fourth mounting groove on one side, which is connected to the first channel (14). The fourth mounting groove has a fourth internal thread, and the second adjusting shell (6) has a fourth external thread that matches the fourth internal thread at one end. The second adjusting shell (6) is threadedly connected to the fixing block (4) through the cooperation of the fourth internal thread and the fourth external thread. The second photodetector (13) is set on the second adjusting shell (6), and the detection end of the second photodetector (13) is located at the end of the second adjusting shell (6) near the first channel (14). The third internal thread is aligned with the axis of the first channel (14), and the axis of the fourth internal thread is perpendicular to the axis of the first channel (14).
4. A photoelectric colorimetric device according to claim 3, characterized in that: The first mounting shell includes a second connector (15) and a first adjusting shell (8). The second connector (15) is fixedly connected to its corresponding moving plate (2). One end of the second connector (15) extends into the shell (1) through the mounting hole (21) and the moving port (18). The other end of the second connector (15) is located on the side of the moving plate (2) away from the shell (1) and is provided with a first mounting groove. The first mounting groove is connected to the second channel (17). The first mounting groove is provided with a first internal thread. One end of the first adjusting shell (8) is provided with a first external thread that matches the first internal thread. The first adjusting shell (8) is threadedly connected to the second connector (15) through the cooperation of the first internal thread and the first external thread. The second channel (17) is located in the second connector (15). The first photodetector (16) is located on the first adjusting shell (8). The detection end of the first photodetector (16) is located at the end of the first adjusting shell (8) near the second channel (17). The axis direction of the first internal thread is consistent with the axis direction of the second channel (17).
5. The photoelectric colorimetric device of claim 1, wherein: A fan (7) is provided on one side of the housing (1). The output end of the fan (7) is connected to the inside of the housing (1). The fan (7) corresponds to the position of the reaction tank (9).
6. A photoelectric colorimetric device according to claim 1, characterized in that: A temperature sensor (11) is fixed to the outer wall of the reaction tank (9).
7. A photoelectric colorimetric device according to claim 1, wherein: The heating wire (10) is wound around the outer wall of the reaction tank (9), and the winding density of the heating wire (10) in the upper part of the reaction tank (9) is less than that in the lower part of the reaction tank (9).
8. The photoelectrical colorimetric device according to claim 1, wherein: Both the first photodetector (16) and the second photodetector (13) use silicon photocells.
9. The photoelectric colorimetric device of claim 1, wherein: The reaction tank (9) includes an upper port and a lower port, and the diameter of the upper port of the reaction tank (9) is larger than the diameter of the lower port of the reaction tank (9).
10. The photoelectrical colorimetric device according to claim 1, wherein: The diameter of the first channel (14) is smaller than the diameter of the second channel (17).