Intelligent liquid flow control device based on multi-band photoelectric detection

Abstract

The utility model relates to an intelligent liquid flow control device based on multiband photoelectric detection. The device comprises a mounting seat, a fixing part for clamping a liquid pipe and a stop lock mechanism for controlling flow are arranged on the mounting seat. The fixing part is provided with a channel and a multiband photoelectric detection module located on one side of the channel. The module can emit at least two wave bands of light beams and receive optical signals to obtain the flow and state information of the liquid. A main control module is further arranged on the mounting seat, which controls the extrusion degree of the stop lock mechanism on the liquid pipe according to the detection signal or the external control signal, so as to accurately adjust or cut off the flow. The utility model realizes accurate identification of the multi-dimensional state of the liquid through multiband photoelectric detection, and combines intelligent closed-loop or open-loop control to significantly improve the safety, reliability and accuracy in the liquid transfer process, and the structure is simple and the cost is controllable.

Description

Technical Field

[0001] This utility model relates to the technical field of fluid control, and more specifically, to an intelligent liquid flow control device based on multi-band photoelectric detection. Background Technology

[0002] In research and production processes in fields such as cell therapy, biopharmaceuticals, chemical analysis, and clinical medicine, precise control of the delivery flow rate and dosage of trace fluids is crucial. For example, accurately adding growth factors to cell culture media, slowly adding catalysts in chemical reactions, or controlling the flow rate of drugs during intravenous infusions all place extremely high demands on the precision and reliability of flow control.

[0003] Traditional fluid delivery methods primarily rely on laboratory or medical personnel manually adjusting the speed of the roller clamps or peristaltic pumps on the infusion set. This method is inaccurate, heavily dependent on personal experience, and cannot monitor the infusion status in real time, posing safety hazards. To address this issue, some simple fluid monitoring devices have emerged on the market. For example, patent number CN220090136 U discloses an automatically locking infusion tube clamp that uses a fluid detection sensor installed in the tube slot to determine whether the infusion has ended.

[0004] The liquid detection sensor detects the presence or absence of liquid in the infusion tubing, using methods such as photoelectric or capacitive sensors. Preferably, the liquid detection sensor is a capacitive coupling sensor. A capacitive coupling sensor determines the presence or absence of liquid in the infusion tubing by detecting changes in capacitance. It is evident that most existing infusion monitoring devices use single-sensor photoelectric or capacitive coupling sensors. While this approach achieves non-contact detection, its functionality is limited, typically only able to determine "present liquid" or "absent liquid." It has poor ability to detect changes in the color and transparency of the liquid in the infusion tubing, as well as tiny air bubbles, leading to frequent false alarms or missed detections.

[0005] Therefore, existing technologies lack a device that can accurately and multidimensionally detect the state of liquid in the pipe, such as bubbles and color, and can achieve intelligent flow control in a simple, reliable, and low-cost manner. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an intelligent liquid flow control device based on multi-band photoelectric detection, which addresses the above-mentioned deficiencies of the prior art.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: This invention provides an intelligent liquid flow control device based on multi-band photoelectric detection, comprising a mounting base; the mounting base is provided with a fixing part for clamping and fixing a liquid pipe, and a locking mechanism for controlling the flow of the liquid pipe; the fixing part is provided with a channel for the liquid pipe to pass through, and a multi-band photoelectric detection module disposed on one side of the channel for detecting the state of the liquid flowing through the liquid pipe; the multi-band photoelectric detection module is used to emit light beams of at least two different wavelengths and receive light signals after passing through or being acted upon by the liquid pipe and the liquid inside the pipe to obtain the flow rate and state information of the liquid; the mounting base is also provided with a main control module; the locking mechanism and the multi-band photoelectric detection module are both electrically connected to and controlled by the main control module; the main control module controls the degree of compression of the liquid pipe by the locking mechanism according to the detection signal of the multi-band photoelectric detection module or an external control signal to adjust or cut off the liquid flow.

[0008] The intelligent liquid flow control device of this utility model includes a multi-band photoelectric detection module comprising a multi-band photoelectric emitter and a composite photoelectric sensing component respectively disposed on both sides of the channel; the multi-band photoelectric emitter includes multiple light sources capable of emitting light beams of different fixed wavelengths; the composite photoelectric sensing component includes multiple photosensitive chips that are sensitive to light beams of different wavelengths.

[0009] The intelligent liquid flow control device of this utility model includes multiple light sources of the multi-band photoelectric emitter, including infrared light sources, visible light sources and / or ultraviolet light sources.

[0010] The intelligent liquid flow control device of this utility model includes a first through hole on the fixing part that communicates with the channel; the fixing part is also provided with a gap adjustment mechanism for adjusting the channel size within the first through hole to accommodate liquid pipes of different specifications within the channel.

[0011] The intelligent liquid flow control device of this utility model includes a receiving cavity in the mounting base; the receiving cavity is connected to the channel through a second through hole; the locking mechanism is located in the receiving cavity; the locking mechanism includes a valve core that can move in the second through hole, and a driving component that drives the valve core to move closer to or away from the channel along the second through hole; the driving component can cause the valve core to apply different clamping forces to the liquid pipe in the channel.

[0012] The intelligent liquid flow control device of this utility model includes a main control module fixedly disposed in the accommodating cavity; the main control module is electrically connected to the drive component.

[0013] The intelligent liquid flow control device of this utility model includes a locking area and a detection area arranged sequentially along the length of the channel; the gap adjustment mechanism and the locking mechanism are located in the locking area; and the multi-band photoelectric detection module is located in the detection area.

[0014] The intelligent liquid flow control device of this utility model includes a gap adjustment mechanism and a locking mechanism respectively disposed on both sides of the channel; the gap adjustment mechanism includes a plug shaft inserted into the first through hole; one end of the plug shaft is provided with a locking part that cooperates with the locking screw to lock, and the other end is provided with a top shaft coaxially disposed with the plug shaft.

[0015] The intelligent liquid flow control device of this utility model includes a main control module that further includes a signal processing circuit electrically connected to the main control board. The signal processing circuit is electrically connected to the output end of the composite photoelectric sensing component and is used to receive and process multiple detection signals from the composite photoelectric sensing component to identify at least one of the following indicators: presence or absence of liquid in the liquid tube, presence of bubbles, liquid color, light transmittance, or light absorbance.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model innovatively employs a multi-band photoelectric detection module, which can emit light beams of at least two different bands and receive the composite light signal after passing through the liquid tube and the liquid. By analyzing the intensity, rate of change, and interrelationship of the light signals of different bands, this device can not only accurately determine the presence or absence of liquid, but also achieve the following detection functions: Bubbles of different sizes scatter and refract light of different wavelengths differently. By using multi-channel signal fusion analysis, bubbles can be accurately distinguished from normal liquids, thus avoiding errors in flow rate calculation caused by bubbles.

[0017] It can detect the color, transmittance, and even absorbance of liquids in real time online. This is especially important for monitoring the infusion of special drugs (such as colored chemotherapy drugs), as it can prevent the wrong medication or monitor changes in drug concentration.

[0018] When the liquid color changes, it may strongly absorb light in a certain wavelength band, but other wavelength bands can still provide useful information. The main control module performs comprehensive analysis and can effectively compensate for this interference, ensuring the stability and accuracy of the detection results, fundamentally solving the inherent defects of traditional single-point detection schemes.

[0019] 2. This invention combines a multi-band photoelectric detection module with a controllable squeezing locking mechanism, all coordinated by a main control module. This allows for dynamic adjustment of the locking mechanism's squeezing level in the tubing based on the liquid state within the tubing. This represents a significant leap from manual / on / off control to automatic adjustment / on / off control, greatly enhancing the safety and effectiveness of intravenous infusion therapy. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the structure of an intelligent liquid flow control device based on multi-band photoelectric detection in Embodiment 1 of this utility model.

[0021] Figure 2 yes Figure 1 An exploded three-dimensional view of an intelligent liquid flow control device based on multi-band photoelectric detection.

[0022] Figure 3 This is a cross-section of an intelligent liquid flow control device based on multi-band photoelectric detection according to Embodiment 1 of this utility model. Figure 1 .

[0023] Figure 4 This is a cross-section of an intelligent liquid flow control device based on multi-band photoelectric detection according to Embodiment 1 of this utility model. Figure 2 . Detailed Implementation

[0024] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0027] Furthermore, the terms indicating orientation, such as "up, down, front, back, left, right, upper end, lower end, longitudinal," etc., are all based on the posture and position of the device or equipment described in this solution during normal use.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] This invention provides an intelligent liquid flow control device based on multi-band photoelectric detection, such as... Figure 1-4 As shown, it includes a mounting base 10 that serves as both overall support and installation foundation. In this embodiment, the mounting base is integrally injection molded from high-temperature resistant, flame-retardant ABS engineering plastic, possessing good mechanical strength and electrical insulation.

[0030] In this embodiment, the mounting base 10 is provided with a fixing part 11 for clamping and fixing the liquid tube, and a locking mechanism 12 for controlling the flow rate of the liquid tube. The fixing part has a channel 111 penetrating its body, the cross-section of which is a semi-circle matching the outer diameter of the standard liquid tube and an opening connected to the semi-circle. The opening gradually locks from the outside to the inside, forming a clamping space for the liquid tube to pass through. The function of the locking mechanism 12 is to physically squeeze the liquid tube, thereby adjusting or completely cutting off the liquid flow rate in the tube by changing the degree of squeezing the tube wall.

[0031] In this embodiment, the liquid tube refers to a transparent, flexible conduit through which cell fluid or other liquids pass. It is a commonly used object in scientific research and production fields such as chemistry, physics, biology, and medical diagnostics, and can be used for blood analysis, liquid component analysis, etc.

[0032] To achieve accurate sensing of the state of the liquid flowing through the liquid pipe, a multi-band photoelectric detection module 13 is provided on one side of channel 111. This module is the core sensing component of this invention. Its function is to emit light beams of at least two different wavelengths and receive the light signals after these light beams pass through or are acted upon by the liquid pipe and the liquid inside. By analyzing these signals, liquid state information such as flow rate, presence or absence, bubbles, color, and light transmittance can be obtained.

[0033] The mounting base 10 also houses a main control module, serving as the "brain" of the entire device. Both the locking mechanism 12 and the multi-band photoelectric detection module 13 are electrically connected to and controlled by the main control module via shielded wires. The main control module receives detection signals from the multi-band photoelectric detection module 13, processes and analyzes them in real time, and sends control signals to the locking mechanism 12 according to preset control logic or external commands, precisely controlling the degree of compression on the liquid pipe to achieve flow regulation or emergency shut-off. Furthermore, this main control module can not only achieve internal closed-loop control but also accept external control signals for open-loop control, such as signals from the host machine controlling liquid flow, on / off states, and photoelectric detection. The main control module can also transmit photoelectric detection results to external devices such as the host machine.

[0034] Specifically, in this embodiment, the multi-band photoelectric detection module 13 adopts a through-beam layout to obtain the optimal detection signal-to-noise ratio. The multi-band photoelectric detection module 13 includes a multi-band photoelectric transmitter 131 and a composite photoelectric sensing component 132 respectively disposed on both sides of the channel 111. The two are fixedly connected by a connecting plate 133 to form an integral module. The connecting plate 133 ensures the relative position stability of the transmitter and receiver and can also serve as a bridge for electrical connection between the two. Optionally, the fixing part 11 can be made of a light-transmitting material to facilitate the multi-band photoelectric transmitter 131 and the composite photoelectric sensing component 132 to successfully detect the liquid tube and realize the transmission of optical signals.

[0035] In this embodiment, the multi-band photoelectric emitter 131 integrates multiple light sources capable of emitting beams of different fixed wavelengths. For example, these light sources may include an infrared LED with a center wavelength of 850nm, a blue LED with a center wavelength of 460nm, and a green LED with a center wavelength of 525nm. The driving circuits of these LEDs are controlled by the main control module, and they are lit sequentially at millisecond intervals using time-division multiplexing to avoid mutual interference between different light sources. Of course, depending on different detection requirements, a 265nm ultraviolet LED can also be added for detecting specific organic components.

[0036] Correspondingly, the composite photoelectric sensing component 132 includes multiple photosensitive chips, each sensitive to different wavelengths of light. For example, it includes a TEMT6000 ambient light sensor sensitive to visible light, a PT908-2B phototransistor sensitive to infrared light, and a photodiode sensitive to green light. Each photosensitive chip is covered with a corresponding narrowband filter to ensure that only light of the target wavelength is received, further improving the accuracy of detection.

[0037] Furthermore, one of the core innovations of this invention lies in utilizing the complex interactions between light of different wavelengths and the liquid tube and the fluid inside the tube to extract rich state information. The detection process is as follows: when the light beam emitted by the multi-band photoelectric emitter 131 passes through the channel 111, it sequentially passes through the tube wall and the liquid inside the tube, and is finally received by the composite photoelectric sensing component 132. During this process, the following physical phenomena mainly occur: 1. Absorption: Specific components in a liquid (such as hemoglobin, bilirubin, or certain drug molecules) selectively absorb light of specific wavelengths. For example, when the liquid in the tube is colorless and transparent, the transmittance of both infrared and visible light is high. However, when a colored drug solution (such as yellow vitamin K injection) is introduced, blue light (460nm) is significantly absorbed, causing a sharp decrease in the intensity of the received blue light signal, while infrared light (850nm) is less affected. The main control module can accurately determine the changes in the liquid's color and concentration by comparing the attenuation ratio of blue and infrared light signals.

[0038] 2. Scattering and Refraction: When bubbles are present in a liquid, the interface between the bubble and the liquid becomes a strong scattering and refraction interface. When a bubble passes through the detection area, it causes intense and irregular scattering of light beams of all wavelengths, resulting in instantaneous, synchronous, and large-amplitude negative pulses in all channels received by the composite photoelectric sensing component 132. By identifying this characteristic multi-channel synchronous pulse signal, the main control module can detect the presence of tiny bubbles with extreme sensitivity and estimate the bubble size based on the pulse width.

[0039] 3. Flow Rate Detection: For non-uniform drip infusions (such as those relying on gravity), the formation and descent of droplets cause periodic blocking and conduction of the optical path. Even in uniform flow, the non-uniformity of microscopic density in the liquid causes high-frequency, weak fluctuations in transmitted light. The main control module can accurately calculate the droplet frequency or flow velocity by analyzing the fluctuation frequency of the infrared light signal, thereby calculating the volumetric flow rate per unit time. For uniform infusions, the flow rate can be calculated by analyzing the specific spectral characteristics of the signal.

[0040] Specifically, the microprocessor in the main control module incorporates a commonly used data fusion algorithm. It comprehensively analyzes information such as signal strength, rate of change, and ratio from multiple sensors, including TEMT6000 (visible light) and PT908-2B (infrared), to construct a multi-dimensional "liquid state fingerprint." By comparing it with a pre-set database, it can accurately distinguish various complex states such as "normal flow," "liquid interruption," "single bubble passage," "continuous bubbles," and "abnormal liquid color," with accuracy and robustness far exceeding single-point detection solutions.

[0041] For example, when the liquid in the tube is colorless and transparent, the transmittance of both infrared and visible light is high. However, when a colored drug solution (such as yellow vitamin K injection) is input, blue light (460nm) is significantly absorbed, causing a sharp drop in the intensity of the received blue light signal, while infrared light (850nm) is less affected. In this case, if only the blue light signal is relied upon for flow calculation (as in traditional single-point detection schemes), a huge error will occur due to the overall attenuation of the signal baseline, potentially leading to misjudgment. To solve this problem, the main control module of this invention adopts a hardware-level comprehensive analysis and compensation mechanism based on multiple signals. This mechanism does not involve complex computer program improvements but is implemented through existing circuit logic and existing physical models.

[0042] The specific analysis and compensation methods are as follows: 1. Normalization of signal reference: The existing signal processing circuit in the main control module first uses the infrared light signal, which is less affected by liquid color, as a reference. For example, at the start of the infusion, the system records the current infrared light signal intensity value I_IR. During subsequent detection, even if the liquid color changes, as long as the tube is full of liquid, the change in the intensity of the infrared light signal is relatively small. The main control module uses this relatively stable infrared light signal intensity I_IR as the benchmark for "fluid flow patency".

[0043] 2. Identification and weight adjustment of interference channels: When the main control module detects a significant and continuous decrease in the blue light signal intensity I_Blue, while the infrared light signal intensity I_IR remains relatively stable, it can be determined that this is a systemic interference caused by changes in liquid color, rather than a sudden change in flow or bubbles.

[0044] Based on this, when calculating flow rate, the main control module automatically reduces the weight of the blue light signal I_Blue, or even temporarily ignores its fluctuations, and instead primarily calculates the flow rate based on the fluctuation frequency of the infrared light signal I_Blue. This is because changes in flow rate (such as droplet formation and flow velocity pulsation) cause synchronous instantaneous fluctuations in all wavelengths of optical signals, while liquid color mainly affects the DC baseline of the signal. Through this hardware-level signal selection and weight adjustment, color interference is effectively eliminated.

[0045] 3. Logic verification of multiple signals: For bubble detection, the main control module uses the "AND" logic found in existing technology for verification. When a genuine bubble passes through the detection zone, it will cause a synchronous, instantaneous, large-amplitude negative pulse in all wavelength bands of light signals (infrared, blue, and green). If only a single wavelength band (such as blue light) shows a signal change, while other wavelength bands (such as infrared) remain unchanged, the system can determine that it is interference or noise, rather than a bubble, thus avoiding false alarms.

[0046] Through the comprehensive analysis and compensation methods based on hardware circuits and simple physical logic, the main control module can effectively distinguish and compensate for interference caused by changes in liquid color, ensuring the stability and accuracy of flow detection results, and fundamentally solving the inherent defects of traditional single-point detection schemes caused by their inability to distinguish interference types.

[0047] Furthermore, to enhance the versatility of the device, the fixing part 11 is provided with a first through hole 112 communicating with the channel 111; the fixing part 11 is also provided with a gap adjustment mechanism 14 for adjusting the size of the channel 111 within the first through hole 112, so as to accommodate liquid pipes of different specifications within the channel 111. In this embodiment, the gap adjustment mechanism 14 includes a plug-in shaft inserted into the first through hole 112. The cross-section of the plug-in shaft is designed to be elliptical. One end of the plug-in shaft is provided with a locking part that cooperates with a locking screw for locking, and the other end is provided with a top shaft arranged coaxially with the plug-in shaft; the locking screw can fix the plug-in shaft on the fixing part 11.

[0048] The axis of the first through hole 112 is perpendicular to the axis of the channel 111. Before being tightened by the locking screw, the plug shaft is in a movable state and can rotate within the first through hole 112. Different positions of its elliptical cross-section will extend into the channel 111, thereby changing the tightness against the liquid tube placed in the channel 111 and achieving fine adjustment of the effective inner diameter of the channel, as detailed below: When the insertion shaft is rotated so that the minor axis of its elliptical cross-section faces the liquid tube, the depth of insertion into channel 111 is minimized, and the clamping force on the liquid tube is weakest, making it suitable for liquid tubes with larger outer diameters.

[0049] As the insertion shaft continues to rotate, causing the major axis of its elliptical cross-section to gradually align with the liquid tube, the depth of insertion into channel 111 increases accordingly, and the clamping force on the liquid tube gradually strengthens, making it suitable for liquid tubes with smaller outer diameters.

[0050] By rotating the connector shaft to different angles, the amount of pressure applied to the liquid tubing can be smoothly adjusted, thereby securely clamping several standard liquid tubings with outer diameters ranging from, for example, 3.5 mm to 4.0 mm. After adjustment, the connector shaft is locked and fixed to the fixing part using the locking screw to prevent it from detaching from the fixing part.

[0051] This elliptical plug-in shaft design is simple and compact in structure, allows for fine-tuning of pipe dimensions, has low manufacturing costs, and is simple and reliable to operate.

[0052] Furthermore, the mounting base 10 has an internal cavity 101 for accommodating and protecting the locking mechanism 12 and the core circuit board of the main control module. This cavity 101 is connected to the channel 111 through a second through hole 102.

[0053] The locking mechanism 12 is located within the receiving cavity 101. The locking mechanism 12 includes a valve core 121 that can reciprocate within the second through-hole 102, and a drive assembly 122 for driving the movement of the valve core 121. The end of the valve core 121 is a tapered structure that gradually tapers from the inside out; this design allows for linear, progressive compression of the liquid tube, resulting in smoother flow regulation. The drive assembly 122 can move the valve core 121 closer to or further away from the channel 111 along the length of the second through-hole 102, thereby applying varying clamping forces from zero to maximum to the liquid tube within the channel 111.

[0054] In this embodiment, the drive assembly 122 can adopt a structure found in the prior art, such as a DC motor with a reduction gearbox. The reduction gearbox drives the output shaft of the DC motor to rotate 90°, causing the eccentric wheel connected to the output shaft to move within the groove of the valve core 121. Since the rotation center of the eccentric wheel 1221 does not coincide with its geometric center, its rotation pushes the sidewall of the groove 1211, thereby efficiently converting the rotational motion of the output shaft into the linear reciprocating motion of the valve core 121 along the axis of the second through hole 102. By precisely controlling the rotation angle and direction of the motor, the displacement of the valve core 121 can be precisely controlled, thereby achieving stepless adjustment of the degree of liquid tube compression. A magnet is provided on the valve core 121, and the position of the valve core 121 can be identified by a Hall sensor on the main control board 15.

[0055] Furthermore, the main control module includes a main control board 15 fixedly disposed within the receiving cavity 101; the main control board 15 is electrically connected to the drive assembly 122. The main control board 15 is fixed within the receiving cavity 101 by screws. The main control board 15 integrates: The existing 32-bit ARM Cortex-M4 core microprocessor has a main frequency of up to 120MHz and is responsible for running control algorithms and data processing. The signal processing circuit connected to the composite photoelectric sensing component 132 includes multiple high-precision operational amplifiers and a 16-bit ADC. The signal processing circuit is electrically connected to the output terminal of the composite photoelectric sensing component 132 and is used to receive and process multiple detection signals from the composite photoelectric sensing component 132 to identify at least one of the following indicators: presence or absence of liquid in the liquid tube, presence of bubbles, liquid color, transmittance or absorbance. The motor drive chip connected to the drive assembly 122 can provide precise micro-stepping control.

[0056] Furthermore, in order to optimize the structural layout and avoid functional interference between components, such as Figure 3 As shown, channel 111 is functionally divided into locking zone A and detection zone B along its length; gap adjustment mechanism 14 and locking mechanism 12 are located in locking zone A, responsible for physically fixing the liquid tube and controlling the flow; multi-band photoelectric detection module 13 is located in detection zone B, where the liquid tube is kept in a relatively natural state to ensure the accuracy of the detection signal of the liquid inside the liquid tube.

[0057] Furthermore, the gap adjustment mechanism 14 and the locking mechanism 12 are respectively disposed on both sides of the channel 111. For example, the gap adjustment mechanism 14 moves along the width direction (X-axis direction) of the fixing part 11 on one side of the channel, and the locking mechanism 12 moves along the length direction (Y-axis direction) of the mounting base 10; this arrangement makes the movement trajectory of the locking mechanism perpendicular to the adjustment trajectory of the gap adjustment mechanism, and the two mechanisms do not interfere with each other.

[0058] The work process is briefly described as follows: In use, the user places the liquid tube into channel 111 and adjusts the gap adjustment mechanism 14 according to the tube diameter to secure the liquid tube. After the system starts, the main control module controls the multi-band photoelectric transmitter 131 to emit colored detection light such as infrared, blue, and green in a time-division manner. After the composite photoelectric sensor component 132 receives the signal, the signal processing circuit converts it into a digital signal for analysis by the main control board. The main control board analyzes the baseline, fluctuation frequency, and amplitude of each band signal to determine the liquid state, such as the presence or absence of liquid, liquid color, and presence or absence of bubbles. The motor drive chip controls the stepper motor to move the valve core 121 to a precise position, changing the degree of compression on the liquid tube, ultimately achieving stable and precise flow control.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A smart liquid flow control device based on multi-band photoelectric detection, characterized in that, The device includes a mounting base; the mounting base is provided with a fixing part for clamping and fixing a liquid tube, and a locking mechanism for controlling the flow rate of the liquid tube; the fixing part is provided with a channel for the liquid tube to pass through, and a multi-band photoelectric detection module is provided on one side of the channel for detecting the state of the liquid flowing through the liquid tube; the multi-band photoelectric detection module is used to emit light beams of at least two different wavelengths and receive light signals after passing through or being acted upon by the liquid tube and the liquid inside the tube to obtain the flow rate and state information of the liquid; the mounting base is also provided with a main control module; the locking mechanism and the multi-band photoelectric detection module are both electrically connected to and controlled by the main control module; the main control module controls the degree of compression of the liquid tube by the locking mechanism according to the detection signal of the multi-band photoelectric detection module or an external control signal to adjust or cut off the liquid flow rate.

2. The intelligent liquid flow control device according to claim 1, characterized in that, The multi-band photoelectric detection module includes a multi-band photoelectric emitter and a composite photoelectric sensing component respectively disposed on both sides of the channel; the multi-band photoelectric emitter includes multiple light sources that can emit light beams of different fixed wavelengths; the composite photoelectric sensing component includes multiple photosensitive chips that are sensitive to light beams of different wavelengths.

3. The intelligent liquid flow control device according to claim 2, characterized in that, The multiple light sources of the multi-band photoelectric emitter include infrared light sources, visible light sources, and / or ultraviolet light sources.

4. The intelligent liquid flow control device according to claim 2, characterized in that, The fixing part is provided with a first through hole that communicates with the channel; the fixing part is also provided with a gap adjustment mechanism for adjusting the channel size located in the first through hole, so as to accommodate liquid pipes of different specifications in the channel.

5. The intelligent liquid flow control device according to any one of claims 2-4, characterized in that, The mounting base has a receiving cavity; the receiving cavity is connected to the channel through a second through hole; the locking mechanism is located in the receiving cavity; the locking mechanism includes a valve core that can move in the second through hole, and a driving assembly that drives the valve core to move closer to or away from the channel along the second through hole; the driving assembly enables the valve core to apply different clamping forces to the liquid tube in the channel.

6. The intelligent liquid flow control device according to claim 5, characterized in that, The main control module includes a main control board fixedly disposed within the accommodating cavity; the main control board is electrically connected to the drive component.

7. The intelligent liquid flow control device according to claim 4, characterized in that, The channel is provided with a locking area and a detection area along its length; the gap adjustment mechanism and the locking mechanism are located in the locking area; the multi-band photoelectric detection module is located in the detection area.

8. The intelligent liquid flow control device according to claim 7, characterized in that, The gap adjustment mechanism and the locking mechanism are respectively disposed on both sides of the channel. The gap adjustment mechanism includes a plug shaft inserted into the first through hole. One end of the plug shaft is provided with a locking part that cooperates with the locking screw to lock, and the other end is provided with a top shaft that is coaxially disposed with the plug shaft.

9. The intelligent liquid flow control device according to claim 6, characterized in that, The main control module also includes a signal processing circuit electrically connected to the main control board. The signal processing circuit is electrically connected to the output end of the composite photoelectric sensing component and is used to receive and process multiple detection signals from the composite photoelectric sensing component to identify at least one of the following indicators: presence or absence of liquid in the liquid tube, presence of bubbles, liquid color, transmittance, or absorbance.

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