Automatic metering and feeding device for polymer barrier emulsion

Abstract

The utility model discloses an automatic metering and feeding device for polymer barrier emulsion, and relates to the field of chemical engineering and coating preparation automation. The device is mainly composed of structures such as multi-storage-barrel parallel feeding, heat tracing stirring anti-blocking, online quantitative control and pipeline cleaning connectors. The device is characterized in that at least two storage barrels are internally provided with stirring mechanisms and liquid level and / or weighing sensors, and feeding can be automatically switched according to a control system; a proportional valve, an on-line flowmeter and a metering pump are sequentially arranged on the discharging pipeline, so that real-time closed-loop control on feeding flow or cumulant is realized; the heat tracing jacket maintains the flowability of the emulsion, the cleaning interface supports on-line purging or liquid flushing, and the valve does not need to be disassembled and assembled. Test results show that the device can continuously run for 8 hours without obvious blockage, the feeding error is less than or equal to + / -0.5%, the times of shutdown and manual cleaning are obviously reduced, and the production line efficiency of large-scale coating or packaging application is improved.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry and coating preparation automation, and more specifically, to an automatic metering and feeding device for polymer barrier emulsion. The device is particularly suitable for the continuous and accurate feeding process of barrier emulsion with high viscosity and easy to foam or form film in the industrial production of paper-based coating, packaging film or functional coating. Background Art

[0002] Polymer barrier emulsions are widely used in food packaging, paper-based composite films and functional coatings due to their excellent waterproof, moisture-proof or gas barrier properties. However, such emulsions tend to have high viscosities (500-5000cP or even higher) and are prone to foaming or filming, leading to the following major problems:

[0003] 1. Unstable feeding accuracy

[0004] Conventional pumping or manual feeding makes it difficult to accurately control the flow of high-viscosity liquids, which can easily lead to formulation deviations and affect the consistency of final product performance.

[0005] 2. Easy to clog and difficult to clean

[0006] If there is a lack of heating and anti-clogging measures, the emulsion may accumulate in the valves and pipe bends, requiring frequent disassembly and cleaning, increasing downtime.

[0007] 3. Difficult to feed continuously

[0008] Most traditional systems only use a single barrel or manual barrel change. Once the barrel is empty, the system must be shut down for processing, making it difficult to keep the production line running continuously.

[0009] To this end, the utility model proposes a feeding device that can automatically switch between multiple storage barrels, heat and stir to prevent blockage, monitor flow online, and quickly clean the pipeline to address the above pain points. Utility Model Content

[0010] 1. Purpose

[0011] The technical problem to be solved by the utility model is to achieve accurate metering, uninterrupted feeding, pipeline blocking prevention and quick cleaning during the feeding process of high-viscosity polymer barrier emulsion. The technical solution proposed can effectively improve the efficiency of the production line and reduce manual maintenance.

[0012] 2. Technical solution

[0013] Multiple storage tanks in parallel: no less than two storage tanks, equipped with stirring mechanisms, and the remaining amount is detected by liquid level and / or weighing sensors. The control system can automatically switch to another storage tank for feeding when the remaining amount in the storage tank is lower than the set threshold to avoid downtime;

[0014] Online quantitative and closed-loop control: On the discharge pipeline, quantitative valves, online flow meters and quantitative pumps are installed in sequence, and the feed flow or cumulative amount is adjusted in real time through the control system, and the feed error can be less than ±0.5%. The control system collects instantaneous flow data from the online flow meter and compares it with the set value. When the deviation exceeds the limit, it automatically adjusts the quantitative valve opening or the quantitative pump speed;

[0015] Heating and stirring: The heating jacket covers the storage barrel and / or the discharge pipe to keep the emulsion at a suitable temperature (such as 30-70°C) to avoid a sudden increase in viscosity or local filming at low temperatures. The stirring mechanism in the barrel can adjust the speed according to the viscosity or solid content to prevent sedimentation;

[0016] Cleaning interface: A cleaning interface is set at the end of the discharge pipeline or near the metering valve, through which cleaning liquid or compressed air can be introduced for purging or flushing; when the valve or discharge pipeline is detected to have a tendency to be blocked, the control system can open the cleaning interface for a short time, significantly reducing downtime and manual disassembly and assembly.

[0017] An automatic metering and feeding device for polymer barrier emulsion, characterized in that it comprises:

[0018] At least two storage barrels, each of which is provided with a stirring mechanism and an external liquid level or weighing sensor for monitoring the remaining amount of the barrier emulsion;

[0019] a discharge pipeline connected to the storage barrel (1), on which a dosing valve, an online flow meter and a dosing pump are sequentially installed; the dosing valve and the dosing pump perform closed-loop control through a control system to achieve accurate automatic dosing of the barrier emulsion;

[0020] A heating jacket covering the storage tank and / or the discharge pipeline to prevent the high-viscosity emulsion from filming or clogging at low temperatures;

[0021] The cleaning interface is located at the end of the discharge pipeline or near the metering valve, and can be purged or flushed online by passing cleaning liquid or gas;

[0022] The control system monitors the remaining amount in the storage tank and automatically switches it based on the feedback information from the liquid level and / or weighing sensor. It adjusts the output of the metering valve or metering pump in combination with the flow data fed back by the online flow meter to ensure that the feeding error is controlled within the preset range.

[0023] The stirring mechanism adopts one of a spiral belt type, a pitched blade type or an anchor type stirring paddle with variable frequency speed regulation.

[0024] The online flow meter may be an electromagnetic flow meter or a mass flow meter, and the quantitative valve may be an electric regulating valve or a pneumatic regulating valve.

[0025] The heating jacket is heated by steam, electricity or circulating hot water.

[0026] 3. Beneficial effects

[0027] Improved feeding accuracy: Through real-time online closed-loop control, the feeding accuracy can be improved to within ±0.5%;

[0028] Continuous feeding: automatic switching of multiple storage tanks with heating and anti-blocking design, long-term operation without frequent shutdown;

[0029] Easy to clean and maintain: The combination of heat tracing and insulation with online cleaning interface greatly reduces the probability of blockage and shortens the cleaning time;

[0030] Adapt to high viscosity: It can be added smoothly into barrier emulsions in the range of 500-5000cP. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 : A schematic structural diagram of an automatic metering and feeding device for polymer barrier emulsion according to the utility model.

[0032] In the figure, 1. storage barrel; 2. stirring mechanism; 3. dosing valve; 4. online flow meter; 5. dosing pump; 6. heating jacket; 7. discharge pipeline; 8. control system; 9. cleaning interface. DETAILED DESCRIPTION

[0033] Example 1

[0034] 1. Device configuration

[0035] Two 300L storage barrels 1, each of which is provided with an inclined blade stirring mechanism 2, wherein the stirring mechanism 2 adopts an inclined blade stirring paddle, and a liquid level sensor is provided outside the barrel;

[0036] The discharge pipeline 7 is provided with a quantitative valve 3, an online flow meter 4 and a quantitative pump 5 in sequence, wherein the quantitative valve 3 is an electric quantitative valve, the online flow meter 4 is an electromagnetic flow meter, and the quantitative pump 5 is a screw quantitative pump;

[0037] The heating jacket 6 covers the discharge pipe 7 and the barrel wall of the storage barrel 1, and is heated by circulating hot water, and the temperature is maintained at 50-60°C;

[0038] The cleaning interface 9 is provided at the end of the discharge pipeline 7;

[0039] The control system 8 centrally manages multi-barrel switching, valves and pump speed adjustment.

[0040] 2. Run the process

[0041] When the liquid level in storage tank 1 is lower than 10%, the control system 8 automatically switches to another storage tank 1;

[0042] The online flow meter 4 feeds back the instantaneous flow in real time, and the control system 8 dynamically adjusts the output of the metering valve 3 or metering pump 5 according to the preset formula amount;

[0043] Every 2 hours, open the cleaning interface 9 and purge for 1 minute to prevent the high-viscosity emulsion from forming a film around the valve body or pipe;

[0044] The feeding was continued for 6 hours, and the error was always ≤±0.5% without obvious blockage.

[0045] Example 2

[0046] 1. Differences from Example 1

[0047] The volume of storage tank 1 is increased to 500L, and the stirring mechanism 2 is changed to a screw ribbon type;

[0048] The online flow meter 4 is replaced with a mass flow meter, which has higher measurement accuracy;

[0049] A pressure sensor is added to the discharge pipeline 7, and the cleaning interface 9 is automatically triggered when a sudden increase in resistance is detected.

[0050] 2. Comparative testing

[0051] The present embodiment 2 was compared with the conventional single pump feeding equipment under the same process conditions (8 hours of continuous operation), and the results are shown in Table 1:

[0052]

[0053] The feeding error is calculated as the percentage of the difference between the measured value of the online flow meter 4 and the target set value to the target value. The results show that the utility model only stops 0 to 1 times due to short-term purge within 8 hours, which is significantly better than the traditional equipment.

[0054] The feeding accuracy has also been improved from the traditional ±1.5% to ±0.5%, which is conducive to ensuring the stability of downstream coating or packaging performance.

[0055] The utility model solves the problems of feeding deviation and frequent shutdown of high-viscosity and easy-to-conjunctiva emulsion in industrial production by integrating functions such as multi-storage tank switching, heating and stirring anti-blocking, online flow closed-loop control and fast cleaning interface, and can be widely used in the continuous feeding process of paper-based coatings, packaging films and various functional coatings. Those skilled in the art can replace or improve the specific structure or control logic without departing from the technical solution, which should still be regarded as falling within the protection scope of the utility model.

Claims

1. An automatic metering and feeding device for polymer barrier emulsion, characterized in that: include: At least two storage barrels (1), each of which is provided with a stirring mechanism (2) and is externally provided with a liquid level or weighing sensor for monitoring the remaining amount of the barrier emulsion; a discharge pipeline (7) connected to the storage barrel (1), on which a dosing valve (3), an online flow meter (4) and a dosing pump (5) are sequentially installed; the dosing valve (3) and the dosing pump (5) perform closed-loop control through a control system (8) to achieve accurate automatic dosing of the barrier emulsion; A heating jacket (6) covers the storage tank (1) and / or the discharge pipeline (7) to prevent the high-viscosity emulsion from forming a film or clogging at low temperatures; A cleaning interface (9) is located at the end of the discharge pipeline (7) or near the metering valve (3), and can be purged or flushed online by passing cleaning liquid or gas; The control system (8) realizes residual monitoring and automatic switching of the storage barrel (1) based on the feedback information of the liquid level and / or weighing sensor; and dynamically adjusts the output of the quantitative valve (3) or the quantitative pump (5) in combination with the flow data fed back by the online flow meter (4), so as to ensure that the feeding error is controlled within a preset range.

2. The automatic metering and feeding device for polymer barrier emulsion according to claim 1, characterized in that: The stirring mechanism (2) adopts one of a spiral belt type, a pitched blade type or an anchor type stirring blade with variable frequency speed regulation.

3. The automatic metering and feeding device for polymer barrier emulsion according to claim 1 or 2, characterized in that: The online flow meter (4) may be an electromagnetic flow meter or a mass flow meter, and the quantitative valve (3) may be an electric regulating valve or a pneumatic regulating valve.

4. The automatic metering and feeding device for polymer barrier emulsion according to claim 1 or 2, characterized in that: The heating jacket (6) is heated by steam, electricity or circulating hot water.

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