An anti-solvent dropping device using photoelectric signal feedback to realize synchronous control
The antisolvent dropping device controlled by photoelectric signal feedback solves the problems of inaccurate antisolvent dropping and insufficient automation, thereby improving the uniformity of perovskite thin films and the performance of solar cells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
- Filing Date
- 2025-05-14
- Publication Date
- 2026-07-21
AI Technical Summary
Existing antisolvent drop-addition technology in perovskite thin film preparation suffers from antisolvent toxicity, inaccurate drop-addition, and easy formation of thin film defects, affecting device performance and stability. Furthermore, existing devices cannot achieve real-time control and automated operation.
An antisolvent dripping device that uses photoelectric signal feedback for synchronous control, combined with a photoelectric sensor, PLC controller and spin coater, monitors and precisely controls the antisolvent dripping in real time, ensuring film uniformity and automated operation.
This improved the uniformity and quality of perovskite thin films, enhanced the photoelectric performance and batch consistency of solar cells, and reduced human error and equipment interference.
Smart Images
Figure CN224538675U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of photovoltaic device manufacturing technology, specifically relating to an antisolvent dripping device that uses photoelectric signal feedback to achieve synchronous control. Background Technology
[0002] Perovskite solar cells are considered a core direction of next-generation photovoltaic technology due to their advantages such as high photoelectric conversion efficiency (laboratory certified efficiency >27%), low material cost, and solution-processability. The crystal quality and defect density of the core light-absorbing layer, the perovskite thin film, directly determine the final performance of the cell. In existing technologies, perovskite precursor solutions (such as a DMF / DMSO mixed solution of Pb12 and formamidinium / methylamine halide) need to be deposited on a conductive substrate (such as FTO / ITO glass or flexible PET / PEN substrate) using a drop-feed technique, and then undergo post-processing such as annealing and crystallization to form a functional thin film.
[0003] The novel perovskite solar cell is based on the liquid phase method. Its core process involves depositing a perovskite precursor solution (such as a mixed solution of Pbl2 and formamidin / methylamine halide) onto the substrate surface and using an antisolvent (such as chlorobenzene, toluene or diethyl ether) to induce rapid crystallization, forming a dense perovskite thin film with high crystallinity.
[0004] The role of antisolvents is to selectively extract the main solvent (such as DMF, DMSO, or γ-butyrolactone) to accelerate the supersaturation of the precursor solution, thereby regulating crystal nucleation and growth kinetics. However, existing antisolvent dropping techniques have significant drawbacks, directly affecting film quality and device photoelectric performance, necessitating the development of novel dropping devices to optimize the process.
[0005] Current antisolvent drop-addition technology faces several key challenges in the preparation of perovskite thin films, mainly in the following aspects:
[0006] First, there are inherent limitations of the antisolvents themselves. Commonly used antisolvents such as chlorobenzene and toluene are highly volatile and biotoxic (LD50 < 500 mg / kg), posing a threat to operator health with prolonged exposure. Furthermore, wastewater treatment is complex and costly. Additionally, the timing of antisolvent addition is extremely critical, requiring completion within a narrow window of a few seconds after spin coating begins. Delays exceeding 2 seconds can lead to excessive evaporation of the main solvent, resulting in numerous pinhole defects and severely impacting film density. On the other hand, the significant polarity difference between the antisolvent and the main solvent can easily cause localized phase separation, forming residual PbI2 regions. Manual addition also easily leads to uneven droplet distribution, inducing the "coffee ring effect," where the edge thickness is higher than the center.
[0007] Secondly, existing drop-addition technology suffers from significant bottlenecks. Most mainstream spin-coating equipment relies on manual or timer control, making it impossible to perceive the liquid film status in real time and precisely control the timing of drop-addition. The open nozzle design is susceptible to air disturbances, leading to instability in the antisolvent coverage area (fluctuations can reach ±15%), thus affecting the consistency of perovskite crystallization. Furthermore, if the main solvent and antisolvent share the same supply line, incomplete removal of residual liquid (residue >0.1%) can cause cross-contamination between batches, resulting in fluctuations in device efficiency.
[0008] Finally, improper droplet control can also have a profound impact on device performance and stability. Uneven antisolvent distribution leading to crystal defects and grain boundary dislocations significantly enhances nonradiative recombination behavior, causing the device open-circuit voltage (VOC) to drop by more than 0.1V. Simultaneously, localized PbI2 enrichment regions (area > 5%) hinder charge transport paths, resulting in a 2-3 fold increase in series resistance (Rs) and a decrease in fill factor (FF) below 75%. Furthermore, some residual antisolvent molecules (such as chlorobenzene) readily adsorb at grain boundaries or defect sites, accelerating perovskite hydrolysis under humid conditions, which is detrimental to the device's stability and lifetime (T80) under damp heat testing conditions. Summary of the Invention
[0009] The purpose of this invention is to overcome the above-mentioned problems and provide an antisolvent dropping device that uses photoelectric signal feedback to achieve synchronous control. This device can achieve precise control of antisolvent dropping, improve film uniformity and quality, and realize automated operation, thereby improving the photoelectric performance and batch consistency of solar cells.
[0010] To achieve the above objectives, the present invention adopts the following technical solution:
[0011] This utility model provides an antisolvent dripping device that utilizes photoelectric signal feedback for synchronous control. The device includes a photoelectric sensor, a spin coater tray, a delivery tube, a PLC controller, and a storage tank. The photoelectric sensor is fixedly mounted on a support, with its detection end vertically aligned with the surface of the spin coater tray. One end of the delivery tube is connected to the storage tank, and the other end has a dripping nozzle. The dripping nozzle is suspended above the spin coater tray via the support. The PLC controller is electrically connected to the photoelectric sensor and the storage tank.
[0012] A further improvement of this invention is that the vertical distance between the detection end of the photoelectric sensor and the surface of the spin coater substrate is 3-100mm.
[0013] A further improvement of this invention is that the drip nozzle of the infusion tube is a detachable nozzle.
[0014] A further improvement of this invention is that the outlet direction of the dispensing nozzle is perpendicular to the central region of the spin coater tray.
[0015] A further improvement of this utility model is that the dripping nozzle is a stainless steel nozzle with an outlet diameter of 3-5mm and an antistatic coating on the outer wall of the nozzle.
[0016] A further improvement of this utility model is that the fixed support includes a vertical column and a horizontal beam, one end of the horizontal beam is fixedly equipped with a photoelectric sensor and an infusion tube, and the other end of the horizontal beam is slidably connected to the vertical column.
[0017] A further improvement of this utility model is that a triangular bracket is provided at the bottom of the vertical column.
[0018] A further improvement of this utility model is that a manual adjustment knob is provided at the connection between the vertical column and the horizontal beam.
[0019] A further improvement of this invention is that the infusion tube is made of polytetrafluoroethylene (PTFE) tubing.
[0020] A further improvement of this invention is that the PLC controller housing is provided with a waterproof panel, on which an emergency stop button and a status indicator light are integrated.
[0021] Compared with the prior art, the present invention has the following beneficial effects:
[0022] This invention discloses an antisolvent dripping device that utilizes photoelectric signal feedback for synchronous control. Through a PLC controller electrically connected to a photoelectric sensor, it can monitor and respond in real time to the state of the spin coater tray, thereby precisely controlling the antisolvent dripping operation and effectively avoiding the impact of human error on the performance of perovskite films. The coordinated operation of the PLC control system and the spin coater tray, combined with the stable connection between the delivery pipe and the storage tank, ensures uniform dripping of the antisolvent, improving the uniformity of the film. Simultaneously, the entire device achieves a high degree of automation; the components are tightly connected via electrical connections, reducing manual intervention, improving production efficiency, and making the antisolvent dripping process more precise, efficient, and stable.
[0023] Furthermore, the infusion tube uses a detachable nozzle, with the outlet direction of the nozzle perpendicular to the center area of the spin coater tray, ensuring that the antisolvent can be accurately dripped onto the target position on the substrate surface.
[0024] Furthermore, a manual adjustment knob is installed between the vertical column and the horizontal beam. The end of the manual adjustment knob is close to the vertical column, making it easy for operators to adjust the dripping height and position according to actual needs.
[0025] Furthermore, the infusion tubing is made of polytetrafluoroethylene (PTFE) tubing, which has good chemical stability and will not react with antisolvents. Attached Figure Description
[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the present invention and do not specifically limit the shapes and proportions of the components of the present invention.
[0027] Figure 1 This is a schematic diagram of the antisolvent dripping device of this utility model;
[0028] Figure 2 These are absorption images of perovskite films formed by adding antisolvent under different time conditions in the embodiments of this utility model;
[0029] Figure 3 These are absorption images of perovskite films formed by adding antisolvent at different speeds in embodiments of this utility model.
[0030] Figure 4 The images show the absorption of perovskite films formed by adding antisolvent under different liquid inlet conditions in the embodiments of this utility model.
[0031] Figure 5 These are absorption images of perovskite films formed by adding antisolvent under different height conditions in the embodiments of this utility model;
[0032] Figure 6 Absorption images of perovskite films formed by adding antisolvent under different time conditions in the comparative examples of this invention;
[0033] Figure 7 Absorption images of perovskite films formed by adding antisolvent at different speeds in the comparative examples of this invention;
[0034] Figure 8 The images show the absorption of perovskite films formed by adding antisolvent under different liquid inlet conditions in the comparative examples of this invention.
[0035] Figure 9 This is an absorption image of the perovskite thin film formed by adding antisolvent under different height conditions in the comparative example of this invention.
[0036] The components include: 1. Photoelectric sensor; 2. Spin coater support; 3. Infusion tube; 4. PLC controller; 5. Storage tank; 6. Fixed bracket; 61. Vertical column; 62. Horizontal beam; 63. Triangular bracket; 64. Manual adjustment knob. Detailed Implementation
[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0040] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0041] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0042] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0043] The present invention will now be described in further detail with reference to the accompanying drawings:
[0044] This utility model provides an antisolvent dripping device that utilizes photoelectric signal feedback for synchronous control, comprising a photoelectric sensor 1, a spin coater tray 2, a delivery tube 3, a PLC controller 4, a storage tank 5, and a fixed bracket 6; wherein the photoelectric sensor 1 is fixedly mounted on the fixed bracket 6, and the detection end of the photoelectric sensor 1 is vertically aligned with the surface of the spin coater tray 2; one end of the delivery tube 3 is connected to the storage tank 5, and the other end is provided with a dripping nozzle 7, which is suspended above the spin coater tray 2 through the fixed bracket 6; the PLC controller 4 is electrically connected to the photoelectric sensor 1 and the storage tank 5.
[0045] The vertical distance between the detection end of the photoelectric sensor 1 and the surface of the spin coater tray 2 is adjustable. By adjusting the manual adjustment knob 64 on the fixed bracket 6, the distance between the photoelectric sensor 1 and the surface of the spin coater tray 2 can be changed according to actual needs to obtain the best detection effect. In practical applications, the vertical distance between the detection end of the photoelectric sensor 1 and the surface of the spin coater tray 2 is usually set in the range of 3-100mm, and can be finely adjusted according to different working environments and detection requirements.
[0046] The drip nozzle 7 of the infusion tubing 3 is a detachable nozzle, and the outlet direction of the drip nozzle 7 is perpendicular to the center area of the spin coater tray 2. The detachable design facilitates cleaning and replacement of nozzles of different specifications to accommodate antisolvents with different viscosities and flow rate requirements. The drip nozzle 7 and the infusion tubing 3 are connected by a standard thread, ensuring a secure connection and easy disassembly and assembly.
[0047] The dispensing nozzle 7 is a stainless steel nozzle with an outlet orifice diameter of 3-5 mm. The outer wall of the nozzle is coated with an anti-static coating. Stainless steel possesses excellent corrosion resistance and mechanical strength, making it suitable for long-term contact with various solutions without chemical reaction. The anti-static coating effectively prevents static electricity buildup, avoiding solution contamination or equipment damage caused by electrostatic discharge.
[0048] The fixed support 6 includes a vertical column 61 and a horizontal beam 62. A photoelectric sensor 1 and an infusion tube 3 are fixedly mounted at one end of the horizontal beam 62. The vertical column 61 and the horizontal beam 62 can be made of aluminum alloy or stainless steel, possessing sufficient strength and rigidity to stably support the entire device. A square through-hole is provided at the other end of the horizontal beam 62, and the end of the vertical column 61 extends out of the square through-hole, allowing the horizontal beam 62 to slide up and down on the vertical column 61. A manual adjustment knob 64 is provided at the connection between the vertical column 61 and the horizontal beam 62, with its end pressed against the vertical column 61. By rotating the manual adjustment knob 64, the height of the horizontal beam 62 can be adjusted, thereby precisely controlling the position of the drip nozzle 7 and the photoelectric sensor 1.
[0049] A triangular bracket 63 is provided at the bottom of the vertical column 61. The triangular bracket 63 consists of three support rods evenly distributed at 120°, which increases the stability of the entire device and prevents swaying or tilting during operation. The bottom of the triangular bracket 63 is equipped with an anti-slip pad, which can effectively reduce vibration and prevent the device from sliding on smooth surfaces.
[0050] It should be noted that the spin coater plate holder 2 used in this utility model is set on the glass plate platform above the spin coater. The glass platform above the spin coater can place the sample in two ways: by setting the spin coater plate holder 2 or by using a mechanical pump to vacuum adsorb the glass plate.
[0051] The infusion tubing 3 is made of polytetrafluoroethylene (PTFE) tubing. PTFE has excellent chemical stability and hardly reacts with any chemical substances. It also has good flexibility and high temperature resistance.
[0052] The PLC controller 4 housing features a waterproof panel with an integrated emergency stop button and status indicator lights. The waterproof panel is IP65 rated, effectively preventing liquid splashes and dust from entering the controller. The emergency stop button has a red mushroom-shaped design for quick shutdown in emergencies. Status indicator lights include a power indicator, a running indicator, and a fault indicator, represented by green, blue, and red LEDs respectively, allowing operators to monitor the equipment's operating status in real time.
[0053] The PLC controller 4 integrates a signal processing module, an execution control module, and a human-machine interface. The signal processing module receives and processes signals from the photoelectric sensor 1, the execution control module controls the opening and closing of the liquid storage tank 5 and the flow rate based on the processed signals, and the human-machine interface provides parameter setting and status display functions. The PLC controller 4 adopts a modular design, which facilitates maintenance and upgrades.
[0054] Working principle:
[0055] The antisolvent dripping device, which utilizes photoelectric signal feedback for synchronous control, operates on the following principle: A PLC controller 4, a stepper motor (the drive motor for the pump), and a storage tank 5 are integrated into a single package, forming a tightly coordinated control system. During operation, the PLC controller 4 acts as the core hub, electrically connected to the stepper motor. One end of the stepper motor draws antisolvent liquid from the sealed storage tank 5, while the other end connects to the delivery pipe 3. In terms of liquid output control, precise control is achieved through three collaborative mechanisms: First, stepper motor speed control. The PLC controller 4 outputs control signals of different frequencies to the driver to adjust the stepper motor speed. A faster speed increases the liquid output per unit time, and vice versa. Second, valve adjustment. A regulating valve is installed on the pipeline between the stepper motor and the delivery pipe 3. The PLC controller 4 controls the opening of the regulating valve according to a preset program or real-time demand. An increased opening increases the output flow rate, and a decreased opening decreases the output flow rate. Third, volume control. Drawing on the principle of a plunger pump, the PLC controller 4 controls relevant components to change the effective volume of the pump, thereby precisely controlling the volume of liquid drawn from the storage tank 5 and output through the delivery pipe 3 each time, thus achieving precise control of the antisolvent output.
[0056] How to use:
[0057] The operator first places the substrate to be coated on the spin coater tray 2, and then sets parameters such as rotation speed, acceleration, dripping timing, and dripping amount through the human-machine interface of the PLC controller 4. When the spin coater tray 2 starts rotating, the photoelectric sensor 1 detects the rotation signal and transmits it to the PLC controller 4. The PLC controller 4 analyzes the rotation speed and stability according to a preset program. When the rotation reaches the preset conditions, the PLC controller 4 issues a command to open the valve of the liquid storage tank 5 and simultaneously starts the stepper motor. After receiving the command from the PLC controller, the stepper motor begins to rotate precisely, pushing the anti-solvent in the liquid storage tank 5 through the delivery tube 3 and the dripping nozzle 7 to be precisely dripped onto the rotating substrate. The dripping process is precisely controlled by the PLC controller 4 to ensure that the dripping amount, dripping speed, dripping timing, and dripping position all meet the preset requirements. Through the counter function of the PLC controller 4, the anti-solvent can be dripped with second-level precision, ensuring a high degree of synchronization and accuracy in the dripping process, and greatly improving the uniformity and repeatability of the anti-solvent coating.
[0058] Example 1
[0059] In this embodiment, an antisolvent is added dropwise using an antisolvent dropwise device. Throughout the experiment, external conditions such as ambient temperature and humidity are strictly controlled at a constant level to eliminate interference from external factors on the experimental results.
[0060] First, the FTO glass was ultrasonically cleaned for 15 minutes in deionized water, acetone, and ethanol, then dried under N2 flow. The dried FTO glass conductive substrate was fixed onto the spin coater tray. The following process parameter combinations were set using a PLC controller: test time of 5s, 10s, 20s, and 60s; dripping speed of 80μl / s, 160μl / s, and 240μl / s; liquid inlet volume of 80μl, 160μl, and 240μl; and dripping height of 3mm, 10mm, and 20mm. The PLC controller synchronous control program was started. When the photoelectric sensor detected the rotation of the spin coater tray, it triggered a stepper motor to drive the liquid storage tank to deliver the antisolvent at the set dripping speed. The antisolvent dripped vertically from the dripping nozzle at a preset height above the substrate surface through the delivery tube. During the dripping process, the PLC controller dynamically adjusted the opening of the regulating valve based on the rotation speed signal fed back by the photoelectric sensor to control the output flow rate of the antisolvent precisely within the preset value. After the addition was completed, the wet film was annealed at 150°C for 10 minutes to prepare a perovskite thin film.
[0061] Using this antisolvent dropping apparatus, thanks to its precise parameter control, the UV spectra of the prepared perovskite films exhibited extremely high overlap under various conditions, including test times of 5s, 10s, 20s, and 60s; dropping rates of 80μl / s, 160μl / s, and 240μl / s; liquid inlet volumes of 80μl, 160μl, and 240μl; and dropping heights of 3mm, 10mm, and 20mm. The test results are shown in [reference needed]. Figures 2 to 5 As shown in the figure, the films prepared using this device by adding the antisolvent exhibit a smoother surface, more uniform height distribution, and lower roughness under all the aforementioned test conditions. This demonstrates that this device can significantly improve product quality and ensure product stability during the perovskite film preparation process.
[0062] Comparative Example 1
[0063] This comparative example uses manual addition of the antisolvent. Throughout the experiment, external conditions such as ambient temperature and humidity are strictly controlled at a constant level to eliminate interference from external factors on the experimental results.
[0064] First, the FTO glass was ultrasonically cleaned for 15 minutes in deionized water, acetone, and ethanol, and then dried under N2 flow. The spin coating of the perovskite layer was prepared in a dry glove box (RH < 10%). The precursor solution was rotated at 5000 rpm for 30 s. Ethyl acetate (EA), the antisolvent, was dropped at different times (5 s, 10 s, 20 s, 60 s), at different heights (3 mm, 10 mm, 20 mm), and at different rates (80 μl / s, 160 μl / s, 240 μl / s) after the start of the spin coating process. The wet film was then annealed at 150 °C for 10 minutes to obtain the perovskite thin film.
[0065] Using a manual dropwise addition of antisolvent, under various combinations of test times (5s, 10s, 20s, 60s), drop rates (80μl / s, 160μl / s, 240μl / s), liquid volumes (80μl, 160μl, 240μl), and drop heights (3mm, 10mm, 20mm), the UV spectra of the prepared perovskite films showed low overlap. The test results were submitted for further evaluation. Figures 6 to 9 As shown in the figure, the surface smoothness of the film formed by artificial dripping is poor, the height distribution is uneven, and the roughness is high. Moreover, the film quality fluctuates greatly under different dripping speeds, test times, liquid volumes, and dripping heights.
[0066] Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the foregoing description. Therefore, the scope of this teaching should not be determined by reference to the foregoing description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed utility model subject matter.
[0067] The above content provides a further detailed description of this utility model. It should not be considered that the specific embodiments of this utility model are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of this utility model, and all such deductions or substitutions should be considered to fall within the scope of protection of this utility model as defined by the submitted claims.
Claims
1. A solvent dispensing device that utilizes photoelectric signal feedback for synchronous control, characterized in that, The device includes a photoelectric sensor (1), a spin coater tray (2), an infusion tube (3), a PLC controller (4), and a storage tank (5). The photoelectric sensor (1) is fixedly mounted on a fixed bracket (6). The detection end of the photoelectric sensor (1) is vertically aligned with the surface of the spin coater tray (2). One end of the infusion tube (3) is connected to the storage tank (5), and the other end is provided with a drip nozzle (7). The drip nozzle (7) is suspended above the spin coater tray (2) through the fixed bracket (6). The PLC controller (4) is electrically connected to the photoelectric sensor (1) and the storage tank (5).
2. The antisolvent dripping device for synchronous control using photoelectric signal feedback according to claim 1, characterized in that, The vertical distance between the detection end of the photoelectric sensor (1) and the surface of the spin coater tray (2) is 3-100mm.
3. The antisolvent dripping device for synchronous control using photoelectric signal feedback according to claim 1, characterized in that, The drip nozzle (7) of the infusion tube (3) is a detachable nozzle.
4. The antisolvent dripping device for synchronous control using photoelectric signal feedback according to claim 1, characterized in that, The outlet direction of the drip nozzle (7) is perpendicular to the central area of the spin coater tray (2).
5. The antisolvent dripping device for synchronous control using photoelectric signal feedback according to claim 1, characterized in that, The drip nozzle (7) is a stainless steel nozzle with an outlet diameter of 3-5 mm and an antistatic coating on the outer wall of the nozzle.
6. The antisolvent dropping device for synchronous control using photoelectric signal feedback according to claim 1, characterized in that, The fixed support (6) includes a vertical column (61) and a horizontal beam (62). One end of the horizontal beam (62) is fixedly equipped with a photoelectric sensor (1) and an infusion tube (3), and the other end of the horizontal beam (62) is slidably connected to the vertical column (61).
7. The antisolvent dropping device for synchronous control using photoelectric signal feedback according to claim 6, characterized in that, The bottom of the vertical column (61) is provided with a triangular bracket (63).
8. The antisolvent dropping device for synchronous control using photoelectric signal feedback according to claim 6, characterized in that, A manual adjustment knob (64) is provided at the connection between the vertical column (61) and the horizontal beam (62).
9. The antisolvent dripping device for synchronous control using photoelectric signal feedback according to claim 1, characterized in that, The infusion tube (3) is made of polytetrafluoroethylene (PTFE) tubing.
10. The antisolvent dropping device for synchronous control using photoelectric signal feedback according to claim 1, characterized in that, The PLC controller (4) has a waterproof panel on its casing, which integrates an emergency stop button and a status indicator light.