A new method for measuring isopropanol concentration by means of inclination angle and application thereof

Abstract

This invention belongs to the field of concentration detection technology and discloses a novel method and application for measuring isopropanol concentration based on tilt angle. The method includes: sampling and pretreatment of the mixed solution; tilt angle detection and specific gravity calculation; data fitting and concentration correlation; data transmission and cloud platform uploading; and real-time display and closed-loop monitoring. This invention is specifically adapted to the mixed solution system of dampening solution, isopropanol, and water in the water tank of offset printing presses. It is unaffected by small amounts of impurities in the solution, and the equipment is waterproof and dustproof, adapting to the industrial environment of printing workshops. Compared with traditional manual sampling or dedicated concentration meter measurement methods, this invention is simple to operate, responds quickly, has low detection costs, and can provide real-time concentration data feedback. It is suitable for online monitoring of isopropanol concentration in industrial production scenarios such as offset printing, and has strong practicality and promotional value.

Description

Technical Field

[0001] This invention belongs to the field of concentration detection technology, and in particular relates to a new method and application for measuring isopropanol concentration based on tilt angle. Background Technology

[0002] In offset printing, isopropanol is a crucial component of the dampening solution, and its concentration directly affects dampening effectiveness, print quality, and the lifespan of printing equipment. A suitable isopropanol concentration can effectively reduce the surface tension of the dampening solution, improve ink transfer uniformity, and reduce problems such as dot gain and ink smearing. Therefore, accurate and real-time monitoring of the isopropanol concentration is a key step in ensuring stable print quality.

[0003] Traditional methods for detecting isopropanol concentration mainly include the following:

[0004] Manual sampling and testing: Operators periodically extract mixed solutions from the printing press's water tank, measure the specific gravity using a hydrometer to calculate the concentration, or perform titration analysis using specialized chemical reagents. This method suffers from detection lag, cannot reflect concentration changes in real time, and is susceptible to environmental factors and operator skill levels, resulting in unstable detection accuracy and increased labor costs.

[0005] Specialized concentration meter testing: such as refractometers and capacitance meters, can achieve a certain degree of rapid detection, but these devices are usually expensive, easily affected by impurities in the dampening solution and temperature changes, and most of them require manual hand operation, making it impossible to achieve online automatic detection and data recording, and thus difficult to meet the automation and intelligent needs of industrial production.

[0006] Existing online detection technologies: Some online concentration detection devices have complex structures, are difficult to install and maintain, and have high requirements for the operating environment. They are not stable in the humid and dusty environment of printing workshops, and their data transmission and storage functions are insufficient, making it impossible to achieve remote monitoring and traceability of data.

[0007] To address the aforementioned issues, there is an urgent need for a new method for measuring isopropanol concentration that is easy to operate, low in cost, responds quickly, and can achieve automatic detection and data uploading to the cloud, in order to meet the needs of real-time monitoring and intelligent management in industrial production. Summary of the Invention

[0008] To overcome the problems existing in related technologies, this invention discloses a new method and application for measuring isopropanol concentration based on tilt angle. It is particularly suitable for online automatic detection of isopropanol concentration in mixed solutions within the water tank of offset printing presses. The purpose of this invention is to overcome the shortcomings of existing isopropanol concentration detection methods, such as detection lag, unstable accuracy, complex operation, high cost, and inability to automatically upload data to the cloud. By modeling the correlation between tilt angle and specific gravity and concentration, combined with wireless transmission and cloud platform technology, this invention achieves automatic, real-time, and accurate detection of isopropanol concentration and visualized data management.

[0009] The technical solution is as follows: A new method for measuring isopropanol concentration based on tilt angle, the method comprising the following steps:

[0010] S1, Mixed solution sampling and pretreatment: A mixed solution of dampening solution, isopropanol and water is extracted from the water tank of the offset printing press using an extraction device and introduced into a special testing container with a built-in battery counterweight structure.

[0011] S2, Tilting Angle Detection and Specific Gravity Calculation: The tilt angle data of the battery counterweight is collected using a tilt angle sensor, the specific gravity of the mixed solution is calculated based on the preset battery counterweight tilt angle formula, and the data is filtered.

[0012] S3, Data Fitting and Concentration Correlation: A cubic polynomial regression equation was established by fitting multiple sets of standard sample data to determine the correspondence between the tilt angle and the specific gravity and isopropanol concentration.

[0013] S4, Data transmission and cloud platform upload: The tilt angle sensor sends data to the local terminal via Bluetooth module, and the terminal uploads the data to the cloud platform via wireless network to complete data storage and remote monitoring;

[0014] S5 provides real-time display and closed-loop monitoring.

[0015] Furthermore, in step S1, the extraction flow rate of the extraction device is 5-10 mL / s;

[0016] The special testing container is made of PVC material with a corrosion-resistant coating on the inner wall. The container volume is set to 550mL. It has a built-in liquid level sensor to detect the highest and lowest liquid levels and automatically controls the pumping and drainage process through a PLC system.

[0017] In step S2, the battery counterweight component inside the detection container tilts as the specific gravity of the mixed solution changes. The tilt angle sensor collects the tilt angle data of the battery counterweight in real time, with a sampling frequency of 10-20Hz.

[0018] In step S2, the specific gravity of the mixed solution is calculated according to the preset battery counterweight tilt angle formula:

[0019]

[0020] In the formula, The specific gravity of the mixed solution. This refers to the fixed coefficient after the testing equipment has been calibrated. The tilt angle.

[0021] In step S2, the collected tilt angle data is filtered using a moving average filtering algorithm.

[0022] In step S3, a cubic polynomial regression equation is established by fitting multiple sets of standard sample data to clarify the specific relationship between the tilt angle and the specific gravity and isopropanol concentration, including:

[0023] S301, pre-configure a standard mixed solution of isopropanol concentration for multiple sets of standard sample data, with a concentration of 0%-20% and an interval of 2%, and measure the tilt angle and specific gravity data of each set of solutions to obtain at least 10 sets of valid sample data;

[0024] S302, with tilt angle as the independent variable, specific gravity as the intermediate variable, and isopropanol concentration as the dependent variable, the least squares method was used to fit the sample data, and a cubic polynomial regression equation was established to determine the quantitative relationship between tilt angle and specific gravity and isopropanol concentration.

[0025] S303 was used to verify the cubic polynomial regression equation by selecting three sets of standard solutions with different concentrations for testing.

[0026] In step S302, the cubic polynomial regression equation is:

[0027]

[0028] In the formula, This refers to the concentration of isopropanol. The coefficients obtained from the fitting are... The specific gravity of the mixed solution. These are the coefficients obtained from the fitting.

[0029] In step S4, the sensor sends data to the local terminal via Bluetooth, and the terminal uploads the data to the cloud platform via a wireless network, realizing data storage and remote monitoring, including:

[0030] S401, the tilt angle sensor sends the processed tilt angle, calculated specific gravity and isopropanol concentration data to the local data receiving terminal via Bluetooth module.

[0031] S402, the local data receiving terminal uploads data to the cloud platform via a 2.4G wireless network, and the cloud platform performs data storage, historical data query, and concentration anomaly alarm threshold setting;

[0032] S403 uses the AES-128 encryption algorithm for data transmission.

[0033] In step S5, the detection device is equipped with a capacitive screen that displays the current isopropanol concentration, remaining battery power, and specific gravity of the mixed solution in real time.

[0034] The cloud platform supports real-time monitoring of concentration trends. When the concentration exceeds the preset threshold, the cloud platform sends alarm information via SMS and APP push.

[0035] If the concentration is abnormal, adjust the amount of isopropanol added to the printing press water tank according to the display of the detection equipment or the prompts of the cloud platform. After adjustment, the detection equipment will continue to detect and update the data to form a closed-loop monitoring system.

[0036] Another objective of this invention is to provide an application of a novel method for measuring isopropanol concentration based on tilt angle. This novel method for measuring isopropanol concentration based on tilt angle is applicable to a mixture of dampening solution, isopropanol, and water in the water tank of an offset printing press, and operates in an industrial environment with a temperature of 10°C-40°C and a humidity of 30%-80%.

[0037] Combining all the above technical solutions, the beneficial effects of this invention are as follows:

[0038] First, by extracting a mixture of dampening solution, isopropanol, and water from the water tank of an offset printing machine into a dedicated container, the specific gravity of the mixed solution is calculated using the tilt angle of the battery counterweight. A cubic polynomial regression equation is established through fitting multiple sets of data to clarify the correspondence between the tilt angle, specific gravity, and isopropanol concentration. Combined with Bluetooth data transmission, 2.4G network cloud upload, and real-time display on the device screen, automatic detection, cloud data uploading, and visual monitoring of isopropanol concentration are achieved. Compared to traditional manual sampling or dedicated concentration meter measurements, this invention is simple to operate, responds quickly, has low detection costs, and can provide real-time concentration data feedback. It is suitable for online monitoring of isopropanol concentration in industrial production scenarios such as offset printing, and has strong practicality and promotional value.

[0039] Secondly, compared with the prior art, the advantages of the present invention further include:

[0040] High real-time detection: It realizes the automated process of mixed solution sampling, detection and data transmission, with a detection response time of ≤5 seconds, requiring no manual intervention, and can reflect the changes in isopropanol concentration in real time, solving the lag problem of traditional detection.

[0041] High detection accuracy: Data is collected with high precision through a tilt angle sensor and fitted with a cubic polynomial regression equation. The concentration detection error is ≤ ±0.5%, which meets the accuracy requirements for isopropanol concentration detection in offset printing.

[0042] Easy to operate and low cost: The equipment has a simple structure and is easy to install and maintain. It does not require complex chemical reagents or expensive detection components. Compared with a dedicated concentration meter, the equipment cost is reduced by 40%-60%, while also reducing the labor cost of manual sampling and testing.

[0043] High level of data intelligence: Supports Bluetooth transmission and 2.4G network cloud upload, enabling real-time data display, remote monitoring, historical traceability and abnormal alarm, facilitating intelligent management of the production process;

[0044] Highly adaptable: It is specifically designed to be compatible with the mixed solution system of dampening solution, isopropanol and water in the water tank of offset printing presses. It is not affected by small impurities in the solution, and the equipment has a waterproof and dustproof design, making it suitable for the industrial environment of printing workshops. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the disclosure of this invention and, together with the description, serve to explain the principles of this disclosure;

[0046] Figure 1 This is a flowchart of a new method for measuring isopropanol concentration based on tilt angle, provided by an embodiment of the present invention. Detailed Implementation

[0047] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] Example 1, as Figure 1 As shown, a new method for measuring isopropanol concentration based on tilt angle includes the following steps:

[0049] S1, Mixed solution sampling and pretreatment: A mixed solution of dampening solution, isopropanol and water is extracted from the water tank of the offset printing press using an extraction device and introduced into a special testing container with a built-in battery counterweight structure.

[0050] S2, Tilting Angle Detection and Specific Gravity Calculation: The tilt angle data of the battery counterweight is collected using a tilt angle sensor, the specific gravity of the mixed solution is calculated based on the preset battery counterweight tilt angle formula, and the data is filtered.

[0051] S3, Data Fitting and Concentration Correlation: A cubic polynomial regression equation was established by fitting multiple sets of standard sample data to determine the correspondence between the tilt angle and the specific gravity and isopropanol concentration.

[0052] S4, Data transmission and cloud platform upload: The tilt angle sensor sends data to the local terminal via Bluetooth module, and the terminal uploads the data to the cloud platform via wireless network to complete data storage and remote monitoring;

[0053] S5, Real-time Display and Closed-Loop Monitoring: The detection device screen displays concentration, power, and specific gravity data in real time, and sends out abnormal alarms through the cloud platform, forming a closed-loop monitoring system.

[0054] For example, in step S1, the extraction flow rate of the extraction device is 5-10 mL / s to ensure uniform sampling and avoid solution stratification from affecting the detection results;

[0055] The specialized testing container is made of PVC with a corrosion-resistant coating (PTFE) on the inner wall, effectively preventing solution corrosion from affecting equipment lifespan. The container has a volume of 550mL and a built-in level sensor that accurately detects the highest and lowest liquid levels, automatically controlling the pumping and draining process via a PLC system. Simultaneously, the sensor can be wirelessly charged inside the container, automatically starting charging when the equipment's battery level drops below 40%, significantly reducing manual maintenance workload and ensuring stable solution levels and continuous, reliable equipment operation.

[0056] For example, in step S2, the battery counterweight component in the detection container tilts as the specific gravity of the mixed solution changes. The tilt angle sensor has an accuracy of ≤0.1° and collects the tilt angle data of the battery counterweight in real time at a sampling frequency of 10-20Hz.

[0057] The specific gravity of the mixed solution is calculated according to the preset battery weight tilt angle formula:

[0058]

[0059] In the formula, The specific gravity of the mixed solution. This refers to the fixed coefficient after the testing equipment has been calibrated. The angle is the tilt angle. This formula is derived based on the mechanical balance principle of battery weight; the collected tilt angle data is filtered using a moving average filtering algorithm to remove interference from environmental vibrations and ensure the accuracy of the specific gravity calculation results.

[0060] For example, in step S3, establishing a cubic polynomial regression equation by fitting multiple sets of standard sample data to clarify the correspondence between the tilt angle and the specific gravity and isopropanol concentration specifically includes:

[0061] S301, a standard mixed solution with isopropanol concentration pre-configured for multiple sets of standard sample data, with a concentration of 0%-20% and an interval of 2%, i.e., the number of samples is no less than 10 sets; the tilt angle and specific gravity data corresponding to each set of solutions are measured respectively to obtain at least 10 sets of valid sample data; this concentration range covers the actual use range of the field environment, which can ensure the detection accuracy of the fitting equation within the core use range.

[0062] S302, with tilt angle as the independent variable, specific gravity as the intermediate variable, and isopropanol concentration as the dependent variable, uses the least squares method to fit the sample data and establishes a cubic polynomial regression equation:

[0063]

[0064] In the formula, This refers to the concentration of isopropanol. The coefficients obtained from the fitting are... The specific gravity of the mixed solution. The coefficients obtained from the fitting are used to determine the quantitative relationship between the tilt angle and the specific gravity and isopropanol concentration.

[0065] S303 verifies the regression equation by selecting three sets of standard solutions with different concentrations for testing, ensuring that the concentration calculation error is ≤ ±0.5%, which meets the accuracy requirements of industrial testing.

[0066] For example, in step S4, the sensor sends data to the local terminal via Bluetooth, and the terminal uploads the data to the cloud platform via a wireless network, realizing data storage and remote monitoring, including:

[0067] S401, the tilt angle sensor sends the processed tilt angle, calculated specific gravity and isopropanol concentration data to the local data receiving terminal via Bluetooth module.

[0068] S402, the local data receiving terminal uploads data to the cloud platform via a 2.4G wireless network, and the cloud platform performs data storage, historical data query, and concentration anomaly alarm threshold setting;

[0069] The S403 uses the AES-128 encryption algorithm for data transmission to ensure data security and prevent data loss or tampering.

[0070] For example, in step S5, the detection device is equipped with a 2.4-inch capacitive screen that displays the current isopropanol concentration, remaining battery power, and specific gravity of the mixed solution in real time, with a data refresh rate of 1 time per second.

[0071] The cloud platform supports remote login and viewing via computer and mobile phone, and real-time monitoring of concentration change trends. When the concentration exceeds the preset threshold, the cloud platform sends alarm information to the management personnel via SMS, APP push and other means.

[0072] If the concentration is abnormal, the operator can adjust the amount of isopropanol added to the printing press water tank according to the display of the detection equipment or the prompts of the cloud platform. After adjustment, the detection equipment will continue to detect and update the data to form a closed-loop monitoring system.

[0073] Application example.

[0074] This new method for measuring isopropanol concentration based on tilt angle is applicable to dampening solution, isopropanol and water mixture in the water tank of offset printing presses, and can work stably in industrial environments with temperatures of 10℃-40℃ and humidity of 30%-80%.

[0075] Example 2, as another embodiment of the present invention, provides a novel method for measuring isopropanol concentration based on tilt angle, including isopropanol concentration detection in the water tank of an offset printing machine; specifically, it includes the following steps:

[0076] Step 1, Mixed solution sampling: A mixed solution of dampening solution, isopropanol and water is extracted from the water tank of the Heidelberg CD102 offset printing machine using an extraction device at a flow rate of 8 mL / s. The solution is then introduced into a 550 mL special testing container with a polytetrafluoroethylene inner wall. After the solution level stabilizes, the sample enters the testing process.

[0077] Step 2, Tilt Angle Detection and Specific Gravity Calculation: The tilt angle sensor (accuracy 0.05°) collects the tilt angle data of the battery counterweight at a frequency of 15Hz. After moving average filtering, the average tilt angle is obtained. According to the preset formula The specific gravity of the mixed solution was calculated. .

[0078] Step 3, Concentration Calculation: Based on the pre-fitted cubic polynomial regression equation (Based on fitting and verification of multiple sets of sample data, the concentration error is ≤ ±0.4%), substitute into... The calculated concentration of isopropanol was C = 12.3%.

[0079] Step 4, Data Transmission and Display: The sensor transmits data such as tilt angle 3.2°, specific gravity 1.356g / cm³, concentration 12.3%, and device battery level 85% to the local terminal via Bluetooth. The terminal then uploads the data to the cloud platform via a 2.4G network, and the device screen displays the above data in real time.

[0080] Step 5, Monitoring and Verification: The cloud platform shows that the concentration is within the preset threshold range (10%-13%), with no alarm prompts. The operator manually sampled the sample and verified the concentration to be 12.1% using a high-precision refractometer. The detection error of this method is 0.2%, meeting the accuracy requirements.

[0081] The testing process took 3 seconds, which is 99% more efficient than traditional manual sampling and testing (which takes 15 minutes). The cost of a single test is less than 0.1 yuan, and it can monitor continuously for 24 hours, effectively ensuring the stability of the dampening solution in printing production.

[0082] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention and within the spirit and principles of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A novel method for measuring isopropanol concentration based on tilt angle, characterized in that, The method includes the following steps: S1, Mixed solution sampling and pretreatment: A mixed solution of dampening solution, isopropanol and water is extracted from the water tank of the offset printing press through an extraction device and introduced into a special detection container with a built-in battery counterweight structure. S2, Tilting Angle Detection and Specific Gravity Calculation: The tilt angle data of the battery counterweight is collected using a tilt angle sensor, the specific gravity of the mixed solution is calculated based on the preset battery counterweight tilt angle formula, and the data is filtered. S3, Data Fitting and Concentration Correlation: A cubic polynomial regression equation was established by fitting multiple sets of standard sample data to determine the correspondence between the tilt angle and the specific gravity and isopropanol concentration. S4, Data transmission and cloud platform upload: The tilt angle sensor sends data to the local terminal via Bluetooth module, and the terminal uploads the data to the cloud platform via wireless network to complete data storage and remote monitoring; S5 provides real-time display and closed-loop monitoring.

2. The novel method for measuring isopropanol concentration based on tilt angle according to claim 1, characterized in that, In step S1, the extraction flow rate of the extraction device is 5-10 mL / s; The special testing container is made of PVC material with a corrosion-resistant coating on the inner wall. The container volume is set to 550mL. It has a built-in liquid level sensor to detect the highest and lowest liquid levels and automatically controls the pumping and drainage process through a PLC system.

3. The novel method for measuring isopropanol concentration based on tilt angle according to claim 1, characterized in that, In step S2, the battery counterweight component inside the detection container tilts as the specific gravity of the mixed solution changes. The tilt angle sensor collects the tilt angle data of the battery counterweight in real time, with a sampling frequency of 10-20Hz.

4. The novel method for measuring isopropanol concentration based on tilt angle according to claim 1, characterized in that, In step S2, the specific gravity of the mixed solution is calculated according to the preset formula for the battery counterweight tilt angle: In the formula, The specific gravity of the mixed solution. This refers to the fixed coefficients after the testing equipment has been calibrated. The tilt angle.

5. The novel method for measuring isopropanol concentration based on tilt angle according to claim 1, characterized in that, In step S2, the collected tilt angle data is filtered using a moving average filtering algorithm.

6. The novel method for measuring isopropanol concentration based on tilt angle according to claim 1, characterized in that, In step S3, a cubic polynomial regression equation is established by fitting multiple sets of standard sample data to clarify the specific relationship between the tilt angle and the specific gravity and isopropanol concentration, including: S301, pre-configure a standard mixed solution of isopropanol concentration for multiple sets of standard sample data, with a concentration of 0%-20% and an interval of 2%, and measure the tilt angle and specific gravity data of each set of solutions to obtain at least 10 sets of valid sample data; S302, with tilt angle as the independent variable, specific gravity as the intermediate variable, and isopropanol concentration as the dependent variable, the least squares method was used to fit the sample data, and a cubic polynomial regression equation was established to determine the quantitative relationship between tilt angle and specific gravity and isopropanol concentration. S303 was used to verify the cubic polynomial regression equation by selecting three sets of standard solutions with different concentrations for testing.

7. The novel method for measuring isopropanol concentration based on tilt angle according to claim 6, characterized in that, In step S302, the cubic polynomial regression equation is: In the formula, This refers to the concentration of isopropanol. The coefficients obtained from the fitting are... The specific gravity of the mixed solution. These are the coefficients obtained from the fitting.

8. The novel method for measuring isopropanol concentration based on tilt angle according to claim 1, characterized in that, In step S4, the sensor sends data to the local terminal via Bluetooth, and the terminal uploads the data to the cloud platform via a wireless network, realizing data storage and remote monitoring, including: S401, the tilt angle sensor sends the processed tilt angle, calculated specific gravity and isopropanol concentration data to the local data receiving terminal via Bluetooth module. S402, the local data receiving terminal uploads data to the cloud platform via a 2.4G wireless network, and the cloud platform performs data storage, historical data query, and concentration anomaly alarm threshold setting; S403 uses the AES-128 encryption algorithm for data transmission.

9. The novel method for measuring isopropanol concentration based on tilt angle according to claim 1, characterized in that, In step S5, the detection device is equipped with a capacitive screen that displays the current isopropanol concentration, remaining battery power, and specific gravity of the mixed solution in real time. The cloud platform supports real-time monitoring of concentration trends. When the concentration exceeds the preset threshold, the cloud platform sends alarm information via SMS and APP push. If the concentration is abnormal, adjust the amount of isopropanol added to the printing press water tank according to the display of the detection equipment or the prompts of the cloud platform. After adjustment, the detection equipment will continue to detect and update the data to form a closed-loop monitoring system.

10. An application of a novel method for measuring isopropanol concentration based on tilt angle, characterized in that, This new method for measuring isopropanol concentration based on tilt angle is applicable to dampening solution, isopropanol and water mixture in offset printing press water tanks, and works in industrial environments with temperatures of 10℃-40℃ and humidity of 30%-80%.

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