Automatic dispersant pva solution preparation system

Abstract

The utility model discloses a dispersing agent PVA solution automation configuration system, include: unpacking small hopper, import end with unpacking feeding equipment corresponding, rotary feed valve, set up on the export of unpacking small hopper, and it has the PLC control system on it, can realize the control to the feed quantity, online weighing module, set up on the export of rotary feed valve, and the weighing sensor on it transmits data to control system, and carries out accurate measurement, preparation tank, and its feeding end is connected with the export of online weighing module through batching conveying equipment, IPR online concentration appearance, and parallel on the conveying pipeline between preparation tank and storage tank. The utility model can solve the problem that traditional manual measurement error is big, and the problem that solid content test accuracy is poor.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, and in particular to an automated preparation system for dispersant PVA solution. Background Technology

[0002] In suspension polymerization, the precise formulation of dispersants plays a decisive role in the stability of the reaction system. As a key auxiliary agent for regulating the polymerization process, its solid content (the proportion of solid components) must be strictly controlled within the range required by the process. However, traditional formulation processes suffer from the following technical bottlenecks: 1. The material metering system has a systematic bias. Current production still relies on a crude metering method of manually counting and packaging bags. Due to a ±5% weight tolerance in the raw material packaging bags, coupled with the instability of manual operation, this results in high deviations in solid content configuration. This metering error directly affects the homogeneity of the polymerization reaction, causing abnormal molecular weight distribution of PVC resin and impacting the mechanical properties of the final product.

[0003] 2. The quality inspection system exhibits significant lag. The existing testing process requires manual sampling from three points (top, middle, and bottom) vertically within the mixing tank after configuration, followed by laboratory drying, weighing, and analysis. This method has three drawbacks: ① random errors due to manual sampling (samples from different operators can vary by ±0.5%); ② long testing cycle (4-6 hours per batch); ③ the risk of external contamination introduced by open sampling. Delayed test results cannot promptly guide production control, resulting in large standard deviations in solid content between batches. This directly leads to fluctuations in polymerization reactor reaction parameters, causing a wide particle size distribution of PVC resin, which severely affects melt flowability during subsequent extrusion processing. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an automated preparation system for dispersant PVA solution.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: An automated preparation system for PVA dispersant solutions includes: The unpacking hopper has an inlet end that corresponds to the unpacking and feeding equipment. A rotary feed valve is installed at the outlet end of the unpacking hopper and is equipped with a PLC control system, which can control the feed rate. The online weighing module is installed at the outlet end of the rotary feeder valve. The weighing sensor on it transmits data to the control system for accurate measurement. The feeding tank has its inlet end connected to the outlet end of the online weighing module via a feeding conveying device; The IPR online concentration meter is connected in parallel to the delivery pipeline between the preparation tank and the storage tank.

[0006] An air hammer is installed on the outer wall of the unpacking hopper.

[0007] The unpacking and feeding equipment includes: Unpacking and feeding machinery is used to feed dispersant packets into unpacking hoppers; The unpacking knife is installed at the inlet end of the unpacking hopper.

[0008] A screen is installed at the inlet end of the unpacking hopper.

[0009] The batching and conveying equipment includes: The screw feeder module is installed at the outlet end of the online weighing module. A small hopper is configured, with its inlet end corresponding to the outlet end of the screw feeding module. The outlet end is connected to the feed end of the preparation tank via a rotary discharge valve.

[0010] An air hammer is installed on the outer wall of the small hopper.

[0011] The beneficial effects of this utility model are: 1. The unpacking hopper of this utility model is connected to a rotary feeder valve, which is equipped with a PLC control system and is mainly responsible for feeding dispersant powder to the online weighing module. The rotary feeder valve is connected to the online weighing module 7, which is equipped with weighing sensors and automated equipment such as a PLC distributed control system. These sensors are typically of the strain gauge, piezoelectric, or magnetoelectric type, and can detect the weight of the material in real time and accurately, transmitting the data to the control system for accurate measurement. The online weighing module is connected to a screw conveyor module, which is also equipped with a PLC control system.

[0012] 2. This utility model comprises multiple core components: a fully automatic unpacking and feeding machine, an online weighing and screw feeding device, and an online concentration meter detection device. The entire process achieves unmanned operation, forming a closed-loop feedback integrated automatic control system. This makes the dispersant configuration more scientific, improves the degree of automation, and enhances the accuracy of solid content, providing a reliable raw material guarantee for suspension polymerization processes.

[0013] 3. This utility model's online weighing module is equipped with a weighing sensor, responsible for converting the material's weight signal into an electrical signal, accurately detecting the material's weight in real time, and transmitting the data to the control system for accurate measurement. The screw feeding module uses a screw frequency converter to feed material into a small hopper. The weighing and conveying control section uses an industrial control microcomputer, with Mitsubishi or Siemens series PLC communication modules and switch input / output modules to achieve ±0.5% feeding error control and a measurement accuracy of 99.5%.

[0014] 4. The IPR online concentration meter of this invention continuously measures the refractive index of the liquid through sensors and data processing technology, thereby obtaining the solid content of the dispersant. This device can accurately monitor and detect changes in the solid content of the liquid, achieving an online detection accuracy of ±0.05-0.1% solid content, thereby maximizing the efficiency and quality of industrial production.

[0015] 5. The side of the unpacking hopper of this utility model is connected to an air hammer IA, and the vibration of the air hammer IA ensures smooth material feeding. The screen effectively intercepts foreign objects, ensuring the purity of the material. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention; Among them, 1-dispersant material bag, 2-unpacking and feeding machine, 3-unpacking knife, 4-screen, 5-unpacking small hopper, 6-rotary feeding valve, 7-online weighing module, 8-screw feeding module, 9-configuration small hopper, 10-rotary discharge valve, 11-preparation tank, 12-storage tank, 13-IPR online concentration meter. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0018] like Figure 1As shown, the automated preparation system for PVA dispersant solution includes: a small unpacking hopper 5, with its inlet end corresponding to the unpacking and feeding equipment; a rotary feed valve 6, located at the outlet end of the small unpacking hopper 5, equipped with a PLC control system for controlling the feed rate; an online weighing module 7, located at the outlet end of the rotary feed valve 6, with its weighing sensor transmitting data to the control system for accurate measurement; a preparation tank 11, whose inlet end is connected to the outlet end of the online weighing module 7 via a batching conveying device; and an IPR online concentration meter 13, connected in parallel to the conveying pipeline between the preparation tank 11 and the storage tank 12. An air hammer is installed on the outer wall of the small unpacking hopper 5. The unpacking and feeding equipment includes: an unpacking and feeding machine 2, used to feed the dispersant package 1 into the small unpacking hopper 5; and an unpacking knife 3, located at the inlet end of the small unpacking hopper 5. A screen 4 is installed at the inlet end of the small unpacking hopper 5. The batching and conveying equipment includes: a screw feeder module 8, which is correspondingly installed at the outlet end of the online weighing module 7; and a small hopper 9, the inlet end of which corresponds to the outlet end of the screw feeder module 8, and the outlet end is connected to the feed end of the preparation tank 11 via a rotary discharge valve 10. An air hammer is installed on the outer wall of the small hopper 9.

[0019] In use, this utility model is configured with a start-up mechanism. After confirming that all manual valves in the preparation tank 11 are closed correctly, the dispersant to be prepared is transported to the designated preparation position via an electric hoist. A command is issued to the control system to start the demineralized water pump and open the pipeline shut-off valve F1 to measure the formula value of the demineralized water. After the measurement is completed, the shut-off valve is closed. The unpacking and feeding machine 2 is started, and the unpacking and feeding machine transports the designated dispersant package 1 to the upper end of the unpacking hopper 5 via a robotic arm. After being split by the unpacking knife 3 and impurities are separated by the screen 4, it is temporarily stored in the unpacking hopper 5. An air hammer IA is installed on the side of the unpacking hopper 5, which operates once every 120 seconds.

[0020] After unpacking, the unpacking and feeding machine 2 stops working, and the rotary feeding valve 6 starts. The dispersant is fed to the online weighing module 7 via frequency conversion through the feeding valve. The online weighing module 7 is equipped with a weighing sensor, which is responsible for converting the weight signal of the material into an electrical signal, detecting the weight of the material in real time and accurately, and transmitting the data to the control system for accurate measurement. The dispersant powder is simultaneously weighed online and fed to the small hopper 9 via the screw feeding module 8 using frequency conversion of the screw. The weighing and conveying control parts both use industrial control microcomputers, with Siemens series PLC communication modules and switch input / output modules to achieve ±0.5% feeding error control and a measurement accuracy of 99.5%. When the weight value stabilizes, the system will display the accurate weighing value. Operators can use this display information to check the system's operating status and adjust parameters or handle abnormal situations in a timely manner. For example, if the error between the weighing display and the formula value is greater than ±10kg, the system is set to automatically add the missing amount of formula to ensure accurate solid content in the formula.

[0021] After the demineralized water and dispersant are weighed to meet the formulation requirements, the rotary discharge valve 10 is opened at a frequency of 20%, with discharge every 30 seconds followed by a 30-second pause, and this operation is repeated. After discharge, heating, cooling, and settling are initiated. After 12 hours of settling, the dispersant delivery pump is started, and the dispersant preparation tank is circulated through pipeline b. The three-way valve F3 is switched to the preparation tank 11 side. The prepared dispersant solution is then transported to the IPR online concentration meter 13. Through sensors and data processing technology, the refractive index of the liquid is continuously measured to obtain the solid content of the dispersant. This device can accurately monitor and detect changes in the solid content of the liquid, achieving an online detection accuracy of ±0.05-0.1% solid content, thereby maximizing the efficiency and quality of industrial production. After the solid content of the dispersant meets the formulation value, the three-way valve F3 is switched to the storage tank 12 side, and the dispersant is transported to the storage tank 12 for later use through pipeline c.

[0022] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An automated preparation system for dispersant PVA solution, characterized in that, include: The unpacking hopper (5) has an inlet end that corresponds to the unpacking and feeding equipment; A rotary feed valve (6) is installed at the outlet end of the unpacking hopper (5) and is equipped with a PLC control system, which can control the feed amount. The online weighing module (7) is installed at the outlet end of the rotary feeder valve (6), and the weighing sensor on it transmits data to the control system for accurate measurement. The feeding tank (11) is connected to the outlet of the online weighing module (7) through the feeding conveying equipment; An online IPR concentration meter (13) is connected in parallel to the delivery pipeline between the preparation tank (11) and the storage tank (12).

2. The automated preparation system for dispersant PVA solution according to claim 1, characterized in that, An air hammer is installed on the outer wall of the unpacking hopper (5).

3. The automated preparation system for dispersant PVA solution according to claim 1, characterized in that, The unpacking and feeding equipment includes: Unpacking and feeding machine (2) is used to feed the dispersant bag (1) into the unpacking hopper (5). The unpacking knife (3) is set at the inlet end of the unpacking hopper (5).

4. The automated preparation system for dispersant PVA solution according to claim 3, characterized in that, A screen (4) is provided at the inlet end of the unpacking hopper (5).

5. The automated preparation system for dispersant PVA solution according to claim 1, characterized in that, The batching and conveying equipment includes: The spiral feeding module (8) is correspondingly installed at the outlet end of the online weighing module (7); A small hopper (9) is configured, with its inlet end corresponding to the outlet end of the screw feeding module (8). The outlet end is connected to the feed end of the preparation tank (11) via a rotary feeding valve (10).

6. The automated preparation system for dispersant PVA solution according to claim 5, characterized in that, An air hammer is provided on the outer wall of the small hopper (9).

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