Automated production system and PLC control method for styrene-acrylic emulsion

Abstract

This invention discloses an automated production system and PLC control method for styrene-acrylic emulsion, specifically relating to the field of styrene-acrylic emulsion production technology. The system includes an installation platform with a polymerization chamber mounted above it. A discharge pipe is connected to the bottom of the polymerization chamber, and four mounting columns are installed around the bottom of the chamber. A PLC controller is mounted on one side of one of the mounting columns. This invention uses the PLC controller to individually control the first, second, and third discharge pipes, feeding materials into the polymerization chamber for polymerization, thus achieving automated production. By integrating an annular heat exchanger into the polymerization chamber, a mixing and feeding mechanism continuously feeds materials from the first temperature control zone into the second temperature control zone. The materials in the second temperature control zone then contact the outer wall of the annular heat exchanger to exchange heat. This allows the materials in the polymerization chamber to quickly contact the inner and outer walls of the annular heat exchanger for heat exchange and temperature control, increasing the heat exchange area, improving heat exchange efficiency, and ensuring temperature control accuracy.

Description

Technical Field

[0001] This invention relates to the field of styrene-acrylic emulsion production technology, specifically to an automated production system and PLC control method for styrene-acrylic emulsion. Background Technology

[0002] Styrene-acrylic emulsion refers to a class of chemicals formed by emulsion polymerization of styrene with acrylamide and acrylates. It is widely used as an adhesive for coating dyeing and printing in the printing and dyeing industry, as well as in coating adhesives in the construction industry and adhesives in wood processing. Since the polymerization reaction of styrene-acrylic emulsion takes place in an emulsion, each reactant monomer undergoes polymerization under the action of an initiator. In the initial stage, the reaction absorbs heat and then releases heat as the reaction progresses. Therefore, temperature control of the material is required during the polymerization of styrene-acrylic emulsion. This involves heating and cooling the styrene-acrylic emulsion to ensure stable polymerization. After polymerization, the material is cooled and discharged to obtain the product. Currently, temperature control of the polymerization reaction chamber is mostly achieved by using an external jacketed heat exchanger, which has a slow heat conduction rate and affects the polymerization efficiency.

[0003] Publication (Announcement) No.: CN116571182A discloses an automated polymerization production equipment and control method for styrene-acrylic emulsion. As the reaction of the material in the installation cylinder releases heat, the temperature inside the installation cylinder rises. When the temperature inside the installation cylinder rises, the water inlet valve of the water inlet pipe is opened, and coolant is introduced into the heat exchange coil through the water inlet pipe and the connecting pipe. The cooling action is achieved by the heat exchange coil contacting the material. The aforementioned styrene-acrylic emulsion production equipment uses heat exchange coils introduced into the installation cylinder for cooling. It can cool the material inside the installation cylinder. However, due to the influence of the volume of the heat exchange coils, if the volume of the heat exchange coils is too large, it will affect the polymerization space. In addition, the material can only exchange heat with the outer wall of the heat exchange coils, which limits the contact area between the material and the heat exchange coils. Therefore, it takes a long time to achieve the cooling effect. At the same time, the material in the installation cylinder that is far from the heat exchange coils cannot achieve a good cooling effect, which may lead to uneven temperature of the material inside the installation cylinder. Furthermore, as the polymerization process proceeds, the material accumulates thicker and thicker on the surface of the heat exchange coil, causing the cooling capacity of the heat exchange coil to drop sharply. It requires manual cleaning after shutdown, making it impossible to achieve continuous and stable heat exchange. Summary of the Invention

[0004] The purpose of this invention is to provide an automated production system and PLC control method for styrene-acrylic emulsion to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution.

[0006] This invention relates to an automated production system for styrene-acrylic emulsion, comprising an installation platform, a polymerization chamber mounted above the platform, a discharge pipe connected to the bottom of the polymerization chamber, four mounting columns around the bottom of the polymerization chamber, a PLC controller mounted on one side of one of the mounting columns, a top cover detachably mounted on the top of the polymerization chamber via bolts, a first material pipe connected to one side of the top cover, a second material pipe connected to one side of the first material pipe on the top cover, and a third material pipe connected to one side of the second material pipe on the top cover, within the polymerization chamber... An annular heat exchanger is provided at intervals. This annular heat exchanger is used for heat exchange and temperature control of the material. The annular heat exchanger divides the polymerization chamber into a first temperature control zone and a second temperature control zone. A mixing and feeding mechanism is installed on the top cover. This mixing and feeding mechanism extends into the first temperature control zone. The mixing and feeding mechanism stirs the material in the first temperature control zone and freely opens and closes to feed the material into the second temperature control zone. A cleaning mechanism is installed in the second temperature control zone. This cleaning mechanism is used to actively scrape and clean the material on the inner and outer walls of the annular heat exchanger.

[0007] Furthermore, the mixing and feeding mechanism includes a geared motor mounted on the center of the upper surface of the top cover via a bracket. A stirring shaft, which is rotatably connected to the geared motor, is rotatably mounted on the center of the lower surface of the top cover. Multiple stirring blades are evenly distributed from top to bottom on the outside of the stirring shaft. Six conveying chambers with open front ends are arranged in a circular array at the bottom of the first temperature control zone. The top of each of the six conveying chambers is connected to a feed inlet on the side away from the second temperature control zone. The front ends of each of the six conveying chambers pass through an annular heat exchanger and communicate with the second temperature control zone. A linkage shaft is rotatably mounted in each of the six conveying chambers. The tail of the linkage shaft is rotatably mounted through the center of the tail of the conveying chamber. A dragon blade is sleeved on the outside of the linkage shaft inside the conveying chamber. A first bevel gear is fixedly mounted on the tail of the linkage shaft. A transmission assembly is sleeved on the bottom of the stirring shaft. The transmission assembly is rotatably connected to the six first bevel gears. The power of the stirring shaft is received by the transmission assembly and transmitted to the six first bevel gears to complete the feeding. An annular cavity is concentrically mounted on the center of the six conveying chambers via a bracket. The tail of the linkage shaft is rotatably mounted through the side wall of the annular cavity.

[0008] Furthermore, the transmission assembly includes a sleeve rotatably fitted outside the stirring shaft. Multiple positioning grooves are arranged in a circular array on the inner wall of the sleeve. Each of the multiple positioning grooves on the sleeve extends outward with an expansion groove. A second bevel gear is concentrically fixed on the outside of the sleeve by a bracket. The second bevel gear is rotatably mounted on the top of the annular cavity. The second bevel gear meshes with six first bevel gears in the annular cavity. A connecting piece is hidden at the bottom of the stirring shaft.

[0009] Furthermore, the connector includes a channel extending through the center of the stirring shaft, an adjustment area at the bottom of the stirring shaft, a pressure plate slidably mounted in the adjustment area, and an electric actuator mounted at the top of the adjustment area. The output end of the electric actuator is fixedly connected to the center of the upper surface of the pressure plate. Four inserts are arranged in a circular array around the stirring shaft, and the four inserts can be inserted into the positioning slots accordingly. Four inclined blocks are arranged in a circular array on the lower surface of the pressure plate, and inclined surfaces that cooperate with the inclined blocks are provided at the tails of the four inserts. Under the push of the electric actuator, the four inserts are extended and retracted through the cooperation of the four inclined blocks and the inclined surfaces. A slide is provided on the inclined surface, and a slider is slidably engaged in the slide and fixedly connected to the inclined block.

[0010] Furthermore, the top and bottom of the four plug-ins on the side away from the inclined surface are recessed with reserved areas. An inclined platform is hidden in the reserved area near the expansion slot. A counterweight is slidably installed on the inclined platform. Two return springs are provided on the other side of the reserved area, and the two return springs are connected to the side wall of the inclined platform to pull the counterweight to return to its original position.

[0011] Furthermore, the annular heat exchanger is composed of a first annular frame, a second annular frame, and an annular heat exchanger cavity. The top and bottom of the annular heat exchanger cavity are detachably and fixedly connected to the first annular frame and the second annular frame, respectively. Multiple interconnected areas are arranged in a circular array on the first annular frame. Sealing rings are integrally fitted on the top and bottom of the annular heat exchanger, and the sealing rings are detachably and fixedly connected to the inner wall of the polymerization cavity. A spiral coil is inserted into the cavity of an annular heat exchanger. A water inlet pipe is connected to and installed on one side of the top of the top cover, and the water inlet pipe is interconnected with the cavity of the annular heat exchanger. A drain pipe is connected to and installed on one side of the bottom of the polymerization chamber, and the drain pipe is interconnected with the cavity of the annular heat exchanger. A steam inlet pipe is connected to and installed on the side of the water inlet pipe on the top cover, and the steam inlet pipe is connected to the input end of the spiral coil. A steam outlet pipe is connected to and installed on the side of the drain pipe at the bottom of the polymerization chamber, and the steam outlet pipe is interconnected with the output end of the spiral coil.

[0012] Furthermore, the cleaning mechanism includes linear modules symmetrically installed on both sides of the upper surface of the top cover. A first annular scraper is fitted to the inner wall of the annular heat exchanger, and a second annular scraper is installed between the outer wall of the annular heat exchanger and the inner wall of the polymerization chamber. A pressure relief pipe is provided through the second annular scraper. Mounting blocks are installed at the output ends of both linear modules. Two linkage rods are installed on the lower surface of both mounting blocks. The bottom of the two linkage rods slides through the top cover and connects to the upper surface of the first and second annular scrapers, respectively.

[0013] Furthermore, a solenoid valve is installed at the end of each of the No. 1, No. 2, and No. 3 material pipes to control their on / off state. Flow meters are also installed in connection with each of the No. 1, No. 2, and No. 3 material pipes to measure the material inside them. A solenoid valve is installed at the end of the discharge pipe to control its on / off state. All of the solenoid valves, flow meters, and solenoid valves are connected to the PLC controller.

[0014] Furthermore, four weighing modules are arranged in a circular array on the mounting platform. The four weighing modules are in contact with the lower surface of the mounting column to complete weight detection. The four weighing modules are also connected to the PLC controller. An industrial thermometer is installed on the top cover. The industrial thermometer extends out of the first temperature control zone to complete temperature measurement. The industrial thermometer is also connected to the PLC controller.

[0015] This invention also provides a PLC control method for an automated production system of styrene-acrylic emulsion, which specifically includes the following steps: Step 1: First, connect material pipe No. 1, material pipe No. 2, and material pipe No. 3 to the acrylate material source, styrene material source, and initiator material source, respectively. Step 2: The PLC controller then controls the feeding actions of material pipe 1, material pipe 2, and material pipe 3 according to the feeding sequence required for polymerization, without the need for manual feeding. Step 3: The PLC controller starts the mixing and feeding mechanism to quickly and thoroughly mix the materials in the polymerization chamber, so that the polymerization reaction can proceed stably and continuously. Step 4: The PLC controller controls the temperature of the annular heat exchanger; Step 5: The PLC controller starts the mixing and feeding mechanism, which transports the material at the bottom of the polymerization chamber to the second temperature control zone, realizing the interconnection between the first and second temperature control zones. This allows the material in the first temperature control zone to be continuously fed into the second temperature control zone. The material entering the second temperature control zone comes into contact with the outer wall of the annular heat exchanger and exchanges heat again, increasing the heat exchange area of ​​the annular heat exchanger. Step 6: The PLC controller starts the cleaning mechanism to quickly scrape the inner and outer walls of the annular heat exchanger, and at the same time scrape and clean the material in the second temperature control zone to prevent material accumulation.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention features a mixing and feeding mechanism that allows the insert to be quickly aligned and inserted into the positioning slot. Continuous feeding can be achieved using a single geared motor without the need for external power output. The power of the subsequent stirring shaft is transmitted to the second bevel gear via a sleeve, which drives the auger blades in the conveying chamber to rotate, introducing the material from the bottom of the polymerization chamber through the inlet and conveying it to the second temperature control zone. This increases the heat exchange area of ​​the annular heat exchanger and improves the heat exchange efficiency. After the liquid level in the second temperature control zone rises, it is discharged from the interconnection area, allowing the material in the first temperature control zone to be introduced from the bottom and fall from a height, thus achieving the mixing action. 2. The present invention has a cleaning mechanism that activates the linear module to drive the No. 1 and No. 2 annular scrapers to move up and down, thereby quickly scraping the inner and outer walls of the annular heat exchanger. At the same time, the material in the No. 2 temperature control zone can be scraped and cleaned during the up and down movement of the No. 2 annular scraper, thus preventing material accumulation. 3. The PLC controller of this invention first controls the weighing module to detect the weight of the polymerization chamber. Subsequently, according to the feeding sequence required for polymerization, it controls the first solenoid valve on the first, second, and third feed pipes, eliminating the need for manual feeding. The flow meter can detect the amount of material flowing through the first, second, and third feed pipes, further improving the feeding accuracy. At the same time, the weighing module detects the weight of the material added to the polymerization chamber in real time.

[0017] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] Figure 1 This is the overall front view of the invention; Figure 2 This is a schematic diagram of the internal structure of the polymerization cavity of the present invention; Figure 3 This is a schematic diagram showing the distribution of the annular heat exchanger of the present invention within the polymerization cavity; Figure 4 This is a schematic diagram of the stirring shaft of the present invention installed on the top cover; Figure 5 This is a schematic diagram of the installation of the No. 2 annular scraper of the present invention in the No. 2 temperature control zone; Figure 6 This is a schematic diagram of the stirring blades of the present invention mounted on the stirring shaft; Figure 7 This is a schematic diagram of the annular heat exchanger structure of the present invention; Figure 8 This is a schematic diagram showing the separation of the annular heat exchanger and the polymerization chamber of the present invention; Figure 9 This is a schematic diagram of the cleaning mechanism of the present invention; Figure 10 This is a schematic diagram of the mixing and feeding mechanism of the present invention; Figure 11 This is a schematic diagram of the transmission component structure of the present invention; Figure 12 This is a schematic diagram of the meshing of the first bevel gear and the second bevel gear of the present invention; Figure 13 This is a schematic diagram showing the separation of the stirring shaft and the sleeve according to the present invention; Figure 14 This is a schematic diagram showing the distribution of the plug-in and positioning slots in this invention; Figure 15 This is a schematic diagram of the connector structure of the present invention; Figure 16 This is a schematic diagram showing the distribution of the counterweights in the reserved area according to the present invention; Figure 17 This is a control diagram of the PLC controller of the present invention.

[0019] In the diagram: 1. Mounting platform; 2. Aggregation chamber; 3. Discharge pipe; 4. Mounting column; 5. PLC controller; 6. Top cover; 7. Material pipe No. 1; 8. Material pipe No. 2; 9. Material pipe No. 3; 10. Annular heat exchanger; 11. Temperature control zone No. 1; 12. Temperature control zone No. 2; 13. Gear motor; 14. Stirring shaft; 15. Stirring blades; 16. Conveying chamber; 17. Feed inlet; 18. Linkage shaft; 19. Drill blades; 20. Bevel gear No. 1; 21. Annular cavity; 22. Sleeve; 23. Positioning groove; 24. Expansion groove; 25. Bevel gear No. 2; 26. Connecting piece; 2601. Channel; 2602. Adjustment area; 2603. Pressure plate; 2604. Electric actuator; 2605. Insert. 2606, Inclined block; 2607, Inclined surface; 2608, Slide rail; 2609, Slider; 27, Reserved area; 28, Inclined platform; 29, Counterweight; 30, Return spring; 31, Ring frame No. 1; 32, Ring frame No. 2; 33, Annular heat exchanger cavity; 34, Interconnection area; 35, Sealing ring; 36, Spiral coil; 37, Water inlet pipe; 38, Drain pipe; 39, Steam inlet pipe; 40, Steam outlet pipe; 41, Linear module; 42, Ring scraper No. 1; 43, Ring scraper No. 2; 44, Pressure relief pipe; 45, Mounting block; 46, Linkage rod; 47, Solenoid valve No. 1; 48, Flow meter; 49, Solenoid valve No. 2; 50, Weighing module; 51, Industrial thermometer. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0021] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0022] Example 1: The present invention provides a technical solution: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 , Figure 8 as well as Figure 17 As shown, the automated production system for styrene-acrylic emulsion includes a mounting platform 1, a polymerization chamber 2 mounted above the mounting platform 1, a discharge pipe 3 connected to the bottom of the polymerization chamber 2, four mounting columns 4 mounted around the bottom of the polymerization chamber 2, a PLC controller 5 (model S7-300) mounted on one side of one of the mounting columns 4, a top cover 6 removably mounted on the top of the polymerization chamber 2 via bolts, a first material pipe 7 connected to one side of the top cover 6, a second material pipe 8 connected to one side of the first material pipe 7 on the top cover 6, and a third material pipe 9 connected to one side of the second material pipe 8 on the top cover 6. An annular heat exchanger 10 is disposed at intervals within the polymerization chamber 2. The annular heat exchanger 10 is used for heat exchange and temperature control of the material. The annular heat exchanger 10 divides the polymerization chamber 2 into a first temperature control zone 11 and a second temperature control zone 12. A mixing and feeding mechanism is installed on the top cover 6. The mixing and feeding mechanism extends into the first temperature control zone 11. The mixing and feeding mechanism stirs the material in the first temperature control zone 11 and freely opens and closes to feed the material into the second temperature control zone 12. A cleaning mechanism is installed in the second temperature control zone 12. The cleaning mechanism is used to actively scrape and clean the material on the inner and outer walls of the annular heat exchanger 10. Among them, a No. 1 solenoid valve 47 is installed at the end of the No. 1 material pipe 7, No. 2 material pipe 8, and No. 3 material pipe 9 to control their opening and closing. A flow meter 48 is installed on the No. 1 material pipe 7, No. 2 material pipe 8, and No. 3 material pipe 9. The flow meter 48 is used to measure the material in the No. 1 material pipe 7, No. 2 material pipe 8, and No. 3 material pipe 9. A No. 2 solenoid valve 49 is installed at the end of the discharge pipe 3 to control its opening and closing. The multiple No. 1 solenoid valves 47, multiple flow meters 48, and No. 2 solenoid valves 49 are all connected to the PLC controller 5. Four weighing modules 50 are arranged in a circular array on the mounting platform 1. The four weighing modules 50 are in contact with the lower surface of the mounting column 4 to complete the weight detection. The four weighing modules 50 are connected to the PLC controller 5. An industrial thermometer 51 is installed on the top cover 6. The industrial thermometer 51 extends out of the No. 1 temperature control zone 11 to complete the temperature measurement. The industrial thermometer 51 is connected to the PLC controller 5. It is worth noting that during the controlled feeding process: the PLC controller 5 first controls the weighing module 50 to detect the weight of the polymerization chamber 2. Subsequently, according to the feeding sequence required for polymerization, it controls the first solenoid valve 47 on the first material pipe 7, the second material pipe 8, and the third material pipe 9, eliminating the need for manual feeding. The flow meter 48 can detect the amount of material flowing through the first material pipe 7, the second material pipe 8, and the third material pipe 9, further improving the feeding accuracy. At the same time, the weighing module 50 detects the weight of the material added to the polymerization chamber 2 in real time. When the specified value is reached, it controls the first solenoid valve 47 to close and stop feeding. Finally, after production is completed, the PLC controller 5 controls the second solenoid valve 49 on the discharge pipe 3 to open and perform the discharge action. In this embodiment of the invention, the annular heat exchanger 10 is composed of a first annular frame 31, a second annular frame 32, and an annular heat exchanger cavity 33. The top and bottom of the annular heat exchanger cavity 33 are detachably and fixedly connected to the first annular frame 31 and the second annular frame 32, respectively. Multiple interconnecting areas 34 are arranged in a circular array on the first annular frame 31. The annular heat exchanger cavity 33 is made of metal. Six through holes that cooperate with the mixing and feeding mechanism are arranged in a circular array on the second annular frame 32. The six through holes are respectively arranged corresponding to the six conveying chambers 16. A sealing ring 35 is integrally fitted on the top and bottom of the annular heat exchanger 10. The sealing ring 35 is detachably and fixedly connected to the inner wall of the polymerization chamber 2. A spiral coil 36 is inserted into the cavity 33 of the annular heat exchanger. A water inlet pipe 37 is connected and installed on one side of the top of the top cover 6. The water inlet pipe 37 passes through the first annular frame 31 and communicates with the cavity 33 of the annular heat exchanger. A drain pipe 38 is connected and installed on one side of the bottom of the polymerization chamber 2. The drain pipe 38 passes through the second annular frame 32 and communicates with the cavity 33 of the annular heat exchanger. A steam inlet pipe 39 is connected and installed on one side of the water inlet pipe 37 on the top cover 6. The steam inlet pipe 39 passes through the first annular frame 31 and communicates with the input end of the spiral coil 36. A steam outlet pipe 40 is connected and installed on one side of the drain pipe 38 at the bottom of the polymerization chamber 2. The steam outlet pipe 40 passes through the second annular frame 32 and communicates with the output end of the spiral coil 36. It is worth noting that during temperature control: the PLC controller 5 obtains temperature data from the industrial thermometer 51 and freely controls the temperature state of the annular heat exchanger 10 to achieve heating and cooling of the material in the polymerization chamber 2 as needed. When cooling is required, external cooling water is simply sent into the annular heat exchanger cavity 33 through the inlet pipe 37 and discharged through the drain pipe 38 to form a circulation. The water in the annular heat exchanger cavity 33 contacts the material in the polymerization chamber 2 to achieve continuous heat exchange, thereby achieving rapid cooling of the material. When heating is required, high-temperature steam is sent into the spiral coil 36 through the steam inlet pipe 39 to contact the water in the annular heat exchanger cavity 33 for heating. Subsequently, the material in the polymerization chamber 2 is driven to contact the annular heat exchanger 10 again to achieve heating. Finally, the condensate and steam are discharged through the steam outlet pipe 40.

[0023] Example 2: Based on the mixing feeding mechanism provided in Example 1, this example provides a further technical solution for the mixing feeding mechanism.

[0024] like Figure 6 and Figures 10-16 As shown, the mixing and feeding mechanism includes a geared motor 13 mounted on the center of the upper surface of the top cover 6 via a bracket. A stirring shaft 14, which is rotatably connected to the geared motor 13, is rotatably mounted on the center of the lower surface of the top cover 6. Multiple stirring blades 15 are evenly distributed from top to bottom on the outside of the stirring shaft 14. Six conveying chambers 16 with open front ends are arranged in a circular array at the bottom of the first temperature control zone 11. The top of each of the six conveying chambers 16 is connected to a feed inlet 17 on the side away from the second temperature control zone 12. The front ends of each of the six conveying chambers 16 pass through an annular heat exchanger 10 and communicate with the second temperature control zone 12. Rotatably mounted in each of the six conveying chambers 16 is... There is a linkage shaft 18, the tail of which is rotatably inserted through the center of the tail of the conveying chamber 16. The external part of the linkage shaft 18 is fitted with a dragon blade 19 inside the conveying chamber 16, and a first bevel gear 20 is fixedly installed at the tail of the linkage shaft 18. A transmission assembly is fitted at the bottom of the stirring shaft 14. The transmission assembly is connected to the six first bevel gears 20. The power of the stirring shaft 14 is received by the transmission assembly and transmitted to the six first bevel gears 20 to complete the feeding. An annular cavity 21 is concentrically mounted between the six conveying chambers 16 by a bracket, and the tail of the linkage shaft 18 is rotatably inserted through the side wall of the annular cavity 21. During the mixing process: By means of a mixing and feeding mechanism, under normal conditions, the PLC controller 5 starts the reduction motor 13, which drives the stirring shaft 14 and multiple stirring blades 15 to rotate, thereby completing the rapid and thorough mixing of the materials in the polymerization chamber 2, so that the polymerization reaction can proceed stably and continuously. In this embodiment of the invention, the transmission assembly includes a sleeve 22 rotatably sleeved on the outside of the stirring shaft 14. Multiple positioning grooves 23 are arranged in a circular array on the inner wall of the sleeve 22. Each of the multiple positioning grooves 23 on the sleeve 22 extends outward with an expansion groove 24. A second bevel gear 25 is concentrically fixed on the outside of the sleeve 22 by a bracket. The second bevel gear 25 is rotatably disposed at the top of the annular cavity 21. A sealing ring is provided at the contact position between the second bevel gear 25 and the annular cavity 21. The second bevel gear 25 meshes with six first bevel gears 20 in the annular cavity 21. A connector 26 is hiddenly installed at the bottom of the stirring shaft 14. The connector 26 includes a channel 2601 that passes through the center of the stirring shaft 14. An adjustment area 2602 is provided at the bottom of the stirring shaft 14. A pressure plate 2603 is slidably installed in the adjustment area 2602. An electric push rod 2604 is installed at the top of the adjustment area 2602. The output end of the electric push rod 2604 is fixedly connected to the center of the upper surface of the pressure plate 2603. Four plug-in 2605 are arranged in a circular array around the stirring shaft 14. The four plug-in 2605 can be inserted into the positioning groove 23. The four plug-in 2605 slide through the stirring shaft 14 and extend into the adjustment area 2602. Four inclined blocks 2606 are arranged in a circular array on the lower surface of the pressure plate 2603. An inclined surface 2607 that cooperates with the inclined blocks 2606 is provided at the tail of the four plug-in 2605. Driven by the electric actuator 2604, the four inclined blocks 2606 cooperate with the inclined surface 2607 to complete the extension and retraction of the four plug-in 2605. A slide 2608 is provided on the inclined surface 2607, and a slider 2609 is slidably engaged in the slide 2608. The slider 2609 is fixedly connected to the inclined block 2606. The cooperation between the slide 2608 and the slider 2609 completes the connection between the inclined block 2606 and the inclined surface 2607. A ring spring can be added between the four plug-in 2605 to accelerate the reset. It is worth noting that during contact temperature control: Due to the mixing and feeding mechanism, the four inserts 2605 are normally hidden within the adjustment area 2602 of the stirring shaft 14. Therefore, there is no power output between the stirring shaft 14 and the sleeve 22, and no feeding action is performed. Subsequently, the PLC controller 5 activates the electric push rod 2604, which moves downward, pushing the pressure plate 2603 downward. Through the pressure of the inclined block 2606 on the inclined surface 2607, the four inserts 2605 are pushed out synchronously on the stirring shaft 14, allowing the four inserts 2605 to be inserted into the corresponding positioning grooves 23 within the sleeve 22, thus achieving a power connection. To improve the stable power connection between the stirring shaft 14 and the sleeve 22, the electric push rod 2604 can be started by the PLC controller 5, while the geared motor 13 is controlled to rotate at a low speed. This allows the insert 2605 to be quickly aligned and inserted into the positioning slot 23. Subsequently, the stirring shaft 14 rotates at high speed and is subjected to centrifugal force, which drives the counterweight 29 to slide out of the reserved area 27 on the inclined platform 28 and enter the expansion slot 24 to engage. This can stably restrict the insert 2605, improve the stability of the insert 2605 in the through slot, and achieve continuous feeding action using a single geared motor 13 without the need for external power output. The power from the subsequent stirring shaft 14 is transmitted to the second bevel gear 25 via the sleeve 22, causing the second bevel gear 25 to rotate within the annular cavity 21. Since the second bevel gear 25 meshes with the six first bevel gears 20, the six first bevel gears 20 and the linkage shaft 18 rotate synchronously, driving the auger blades 19 within the conveying cavity 16 to rotate. This draws material from the bottom of the polymerization cavity 2 through the feed inlet 17 and conveys it to the second temperature control zone 12, achieving interconnection between the first temperature control zone 11 and the second temperature control zone 12. This allows material from the first temperature control zone 11 to be continuously fed into the second temperature control zone 12, and the material entering the second temperature control zone 12 interacts with... The outer wall of the annular heat exchanger 10 contacts the surface again to achieve heat exchange, which increases the heat exchange area of ​​the annular heat exchanger 10 and improves the heat exchange efficiency. After the liquid level in the second temperature control zone 12 rises, it is discharged from the interconnection zone 34, which allows the material in the first temperature control zone 11 to be introduced from the bottom and fall from the top to achieve a stirring and mixing action. The material discharged through the interconnection zone 34 falls from the top into the first temperature control zone 11, which increases the flow of the material and makes the temperature of the material in the polymerization chamber 2 more uniform. The effect of secondary stirring is completed in the heat exchange process. Finally, the electric push rod 2604 resets and drives the plug 2605 to move out of the positioning groove 23 to complete the power cut-off. In this embodiment of the invention, the top and bottom of the four plug-ins 2605 on the side away from the inclined surface 2607 are recessed with reserved areas 27. An inclined platform 28 is hidden in the reserved area 27 near the expansion slot 24. A counterweight 29 is slidably installed on the inclined platform 28. The counterweight 29 is normally hidden in the reserved area 27. The counterweight 29 can move up the inclined platform 28, extend out of the reserved area 27 and enter the expansion slot 24. Two return springs 30 are provided on the other side of the reserved area 27. The two return springs 30 are connected to the side wall of the inclined platform 28 to pull the counterweight 29 to reset. The wiring of the electric push rod 2604 can be introduced through the channel 2601 and connected to the external power supply through the conductive slip ring, ensuring a stable power supply to the electric push rod 2604.

[0025] Example 3: Based on the cleaning mechanism provided in Example 1, this example provides a further technical solution for the cleaning mechanism.

[0026] like Figure 5 and Figure 9 As shown, the cleaning mechanism includes linear modules 41 symmetrically installed on both sides of the upper surface of the top cover 6. A first annular scraper 42 is fitted into the inner wall of the annular heat exchanger 10 for scraping and cleaning the inner wall of the annular heat exchanger 10. A second annular scraper 43 is installed between the outer wall of the annular heat exchanger 10 and the inner wall of the polymerization chamber 2 for scraping and cleaning the second temperature control zone 12. A vent is provided through the second annular scraper 43. Pressure relief pipe 44, on which a one-way valve is installed to restrict the one-way discharge of gas. The one-way valve is used to discharge the gas below the second temperature control zone 12 to the area above the second temperature control zone 12 through the pressure relief pipe 44. Mounting blocks 45 are installed at the output ends of the two linear modules 41. Two linkage rods 46 are installed on the lower surface of the two mounting blocks 45. The bottom of the two linkage rods 46 slides through the top cover 6 and is connected to the upper surface of the first annular scraper 42 and the second annular scraper 43 respectively. It is worth noting that during cleaning: The PLC controller 5 reverse-drives the reduction motor 13 via a cleaning mechanism, using the auger blades 19 to discharge the material from the second temperature control zone 12 back into the first temperature control zone 11. Simultaneously, under normal conditions, the second annular scraper 43 is hidden at the bottom of the second temperature control zone 12. When cleaning is required, the PLC controller 5 activates the linear module 41, pulling the linkage rod 46 upwards, thus causing the first annular scraper 42 and the second annular scraper 43 to move up and down, thereby cleaning the annular exchange... The inner and outer walls of the heater 10 are quickly scraped. At the same time, the material in the second temperature control zone 12 is scraped and cleaned as the second annular scraper 43 moves up and down, preventing material accumulation. In order to ensure the stability of the second annular scraper 43 during its up and down sliding, a pressure relief pipe 44 is provided on the second annular scraper 43. When the second annular scraper 43 moves down, it can discharge the gas at the bottom of the second temperature control zone 12, preventing the sliding of the second annular scraper 43 from being obstructed and ensuring that the cleaning work is carried out efficiently and stably.

[0027] Example 4: A PLC control method for an automated production system of styrene-acrylic emulsion, the PLC control method specifically includes the following steps: Step 1: First, connect material pipe 7 (number 1), material pipe 8 (number 2), and material pipe 9 (number 3) to the acrylate material source, styrene material source, and initiator material source, respectively. Step 2: PLC controller 5 then controls material pipe 7, material pipe 8 and material pipe 9 to feed materials according to the feeding sequence required for polymerization, without the need for manual feeding. Step 3: PLC controller 5 starts the mixing and feeding mechanism to quickly and thoroughly mix the materials in polymerization chamber 2, so that the polymerization reaction can proceed stably and continuously. Step 4: PLC controller 5 controls the temperature of annular heat exchanger 10; Step 5: PLC controller 5 starts the mixing and feeding mechanism to transport the material at the bottom of the polymerization chamber 2 to the second temperature control zone 12, realizing the interconnection between the first temperature control zone 11 and the second temperature control zone 12. This allows the material in the first temperature control zone 11 to be continuously fed into the second temperature control zone 12. The material entering the second temperature control zone 12 contacts the outer wall of the annular heat exchanger 10 to exchange heat again, increasing the heat exchange area of ​​the annular heat exchanger 10. Step 6: The PLC controller 5 starts the cleaning mechanism to quickly scrape the inner and outer walls of the annular heat exchanger 10, and at the same time scrape and clean the material in the second temperature control zone 12 to prevent material accumulation.

[0028] This invention provides an automatic production system and PLC control method for styrene-acrylic emulsion. The specific working principle is as follows: First, material pipe 7, material pipe 8, and material pipe 9 are connected to the acrylic ester source, styrene source, and initiator source, respectively, to ensure a sufficient supply of material sources in the subsequent production process. Subsequently, the PLC controller 5 individually controls the No. 1 material pipe 7, No. 2 material pipe 8, and No. 3 material pipe 9 to feed the material into the polymerization chamber 2 for polymerization reaction, realizing automated production without the need for manual feeding operations, saving time and labor, and improving production efficiency. By integrating the annular heat exchanger 10 into the polymerization chamber 2, and forming the No. 1 temperature control zone 11 and the No. 2 temperature control zone 12 in the polymerization chamber 2, under normal conditions, the material in the No. 1 temperature control zone 11 is mixed and stirred by the mixing and feeding mechanism to accelerate the polymerization reaction. When it is necessary to adjust the temperature of the material in the polymerization chamber 2, the material in the first temperature control zone 11 is continuously fed into the second temperature control zone 12 by the mixing and feeding mechanism. Then, the material in the second temperature control zone 12 comes into contact with the outer wall of the annular heat exchanger 10 to achieve heat exchange. This allows the material in the polymerization chamber 2 to quickly come into contact with the inner and outer walls of the annular heat exchanger 10 to achieve heat exchange and temperature control, increasing the heat exchange area, improving the heat exchange efficiency, and ensuring the accuracy of temperature control. Furthermore, the material drawn out through the second temperature control zone 12 falls from a height in the first temperature control zone 11, which further improves the mixing accuracy of the material, allowing the material to flow faster and improving the uniformity of the material temperature. At the same time, with the assistance of the cleaning mechanism, the inner and outer walls of the annular heat exchanger 10 can be scraped and cleaned, ensuring the heat exchange accuracy of the annular heat exchanger 10 and reducing the difficulty of manual cleaning.

[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An automatic production system for styrene-acrylic emulsion, comprising a mounting platform (1), a polymerization chamber (2) mounted above the mounting platform (1), a discharge pipe (3) connected to the bottom of the polymerization chamber (2), four mounting columns (4) mounted around the bottom of the polymerization chamber (2), a PLC controller (5) mounted on one side of one of the mounting columns (4), and a top cover (6) detachably mounted on the top of the polymerization chamber (2) by bolts, characterized in that: A first material pipe (7) is connected and installed on one side of the top cover (6). A second material pipe (8) is connected and installed on one side of the first material pipe (7) on the top cover (6). A third material pipe (9) is connected and installed on one side of the second material pipe (8) on the top cover (6). An annular heat exchanger (10) is arranged at intervals in the polymerization chamber (2). The annular heat exchanger (10) is used to exchange heat and control the temperature of the material. The annular heat exchanger (10) divides the polymerization chamber (2) into a first temperature control zone. (11) Second temperature control zone (12): A mixing and feeding mechanism is installed on the top cover (6). The mixing and feeding mechanism extends into the first temperature control zone (11). The mixing and feeding mechanism stirs the material in the first temperature control zone (11) and freely opens and closes to feed the material into the second temperature control zone (12). A cleaning mechanism is installed in the second temperature control zone (12). The cleaning mechanism is used to actively scrape and clean the material on the inner and outer walls of the annular heat exchanger (10). The mixing and feeding mechanism includes a geared motor (13) mounted on the center of the upper surface of the top cover (6) via a bracket. A stirring shaft (14) connected to the geared motor (13) is rotatably mounted on the center of the lower surface of the top cover (6). Multiple stirring blades (15) are evenly distributed from top to bottom outside the stirring shaft (14). Six conveying chambers (16) with open front ends are arranged in a circular array at the bottom of the first temperature control zone (11). The top of the six conveying chambers (16) is connected to the side away from the second temperature control zone (12) and each of them is equipped with a feed inlet (17). The front ends of the six conveying chambers (16) all pass through the annular heat exchanger (10) and communicate with the second temperature control zone (12). A linkage shaft (18) is rotatably installed in each of the six conveying chambers (16). The tail of the linkage shaft (18) is rotatably inserted through the center of the tail of the conveying chamber (16). A dragon blade (19) is sleeved on the outside of the linkage shaft (18) inside the conveying chamber (16). A first bevel gear (20) is fixedly installed at the tail of the linkage shaft (18). A transmission assembly is sleeved at the bottom of the stirring shaft (14). The transmission assembly is connected to the six first bevel gears (20). The power of the stirring shaft (14) is received by the transmission assembly and transmitted to the six first bevel gears (20) to complete the feeding. An annular cavity (21) is concentrically mounted between the six conveying chambers (16) by a bracket. The tail of the linkage shaft (18) is rotatably inserted through the side wall of the annular cavity (21). The transmission assembly includes a sleeve (22) rotatably fitted outside the stirring shaft (14). Multiple positioning grooves (23) are arranged in a circular array on the inner wall of the sleeve (22). Each of the multiple positioning grooves (23) on the sleeve (22) extends outward with an expansion groove (24). A second bevel gear (25) is concentrically fixed on the outside of the sleeve (22) by a bracket. The second bevel gear (25) is rotatably set at the top of the annular cavity (21). The second bevel gear (25) meshes with six first bevel gears (20) in the annular cavity (21). A connector (26) is hidden at the bottom of the stirring shaft (14). The connector (26) includes a channel (2601) that passes through the center of the stirring shaft (14), an adjustment area (2602) is provided at the bottom of the stirring shaft (14), a pressure plate (2603) is slidably installed in the adjustment area (2602), and an electric push rod (2604) is installed at the top of the adjustment area (2602). The output end of the electric push rod (2604) is fixedly connected to the center of the upper surface of the pressure plate (2603), and four plug-in (2605) are arranged in a circular array around the stirring shaft (14). Four inserts (2605) can be inserted into the positioning slots (23) respectively. Four inclined blocks (2606) are arranged in a circular array on the lower surface of the pressure plate (2603). An inclined surface (2607) that cooperates with the inclined blocks (2606) is provided at the tail of the four inserts (2605). Under the push of the electric push rod (2604), the four inserts (2605) are extended and retracted through the cooperation of the four inclined blocks (2606) and the inclined surface (2607). A slide (2608) is provided on the inclined surface (2607), and a slider (2609) is slidably engaged in the slide (2608). The slider (2609) is fixedly connected to the inclined block (2606).

2. The automatic production system of styrene-acrylic emulsion according to claim 1, characterized in that: The top and bottom of the four plugs (2605) away from the inclined surface (2607) are recessed with reserved areas (27). An inclined platform (28) is hidden in the reserved area (27) near the expansion slot (24). A counterweight (29) is slidably installed on the inclined platform (28). Two return springs (30) are provided on the other side of the reserved area (27). The two return springs (30) are connected to the side wall of the inclined platform (28) to pull the counterweight (29) to reset.

3. The automatic production system of styrene-acrylic emulsion according to claim 2, characterized in that: The annular heat exchanger (10) is composed of a first annular frame (31), a second annular frame (32) and an annular heat exchanger cavity (33). The top and bottom of the annular heat exchanger cavity (33) are detachably and fixedly connected to the first annular frame (31) and the second annular frame (32) respectively. Multiple interconnected areas (34) are arranged in a circular array on the first annular frame (31). A sealing ring (35) is integrally fitted on the top and bottom of the annular heat exchanger (10), and the sealing ring (35) is detachably and fixedly connected to the inner wall of the polymerization cavity (2). A spiral coil (36) is inserted into the cavity (33) of the annular heat exchanger. A water inlet pipe (37) is connected to one side of the top of the top cover (6) and is interconnected with the cavity (33) of the annular heat exchanger. A drain pipe (38) is connected to one side of the bottom of the polymerization chamber (2) and is interconnected with the cavity (33) of the annular heat exchanger. A steam inlet pipe (39) is connected to one side of the water inlet pipe (37) on the top cover (6) and is connected to the input end of the spiral coil (36). A steam outlet pipe (40) is connected to one side of the drain pipe (38) at the bottom of the polymerization chamber (2) and is interconnected with the output end of the spiral coil (36).

4. The automatic production system of styrene-acrylic emulsion according to claim 3, characterized in that: The cleaning mechanism includes linear modules (41) symmetrically installed on both sides of the upper surface of the top cover (6), a first annular scraper (42) is fitted to the inner wall of the annular heat exchanger (10), a second annular scraper (43) is installed between the outer wall of the annular heat exchanger (10) and the inner wall of the polymerization chamber (2), and a pressure relief pipe (44) is provided through the second annular scraper (43). The output ends of the two linear modules (41) are each equipped with a mounting block (45), and two linkage rods (46) are installed on the lower surface of the two mounting blocks (45). The bottom of the two linkage rods (46) slides through the top cover (6) and is connected to the upper surface of the first annular scraper (42) and the second annular scraper (43) respectively.

5. The automatic production system of styrene-acrylic emulsion according to claim 4, characterized in that: A solenoid valve (47) is installed at the end of the first material pipe (7), the second material pipe (8), and the third material pipe (9) to control their opening and closing. A flow meter (48) is connected to the first material pipe (7), the second material pipe (8), and the third material pipe (9). The flow meter (48) is used to measure the material in the first material pipe (7), the second material pipe (8), and the third material pipe (9). A solenoid valve (49) is installed at the end of the discharge pipe (3) to control its opening and closing. The multiple solenoid valves (47), the multiple flow meters (48), and the solenoid valves (49) are all connected to the PLC controller (5).

6. The automated production system for styrene-acrylic emulsion according to claim 5, characterized in that: The mounting platform (1) is provided with four weighing modules (50) arranged in a circular array. The four weighing modules (50) are in contact with the lower surface of the mounting column (4) to complete the weight detection. The four weighing modules (50) are also in communication with the PLC controller (5). An industrial thermometer (51) is installed on the top cover (6). The industrial thermometer (51) extends out of the first temperature control zone (11) to complete the temperature measurement. The industrial thermometer (51) is also in communication with the PLC controller (5).

7. A PLC control method for an automated production system of styrene-acrylic emulsion, characterized in that: The PLC control method for the automated production system of styrene-acrylic emulsion according to any one of claims 1-6 specifically includes the following steps: Step 1: First, connect material pipe 1 (7), material pipe 2 (8) and material pipe 3 (9) to the acrylic ester source, styrene source and initiator source respectively; Step 2: The PLC controller (5) then controls the feeding sequence required for polymerization to feed pipes 1 (7), 2 (8), and 3 (9) to perform feeding actions without manual feeding. Step 3: The PLC controller (5) starts the mixing and feeding mechanism to quickly and fully mix the materials in the polymerization chamber (2), so that the polymerization reaction can proceed stably and continuously. Step 4: The PLC controller (5) controls the temperature of the annular heat exchanger (10); Step 5: The PLC controller (5) starts the mixing and feeding mechanism to transport the material at the bottom of the polymerization chamber (2) to the second temperature control zone (12), realizing the interconnection between the first temperature control zone (11) and the second temperature control zone (12), so that the material in the first temperature control zone (11) is continuously fed into the second temperature control zone (12), and the material entering the second temperature control zone (12) contacts the outer wall of the annular heat exchanger (10) to achieve heat exchange again, increasing the heat exchange area of ​​the annular heat exchanger (10); Step 6: The PLC controller (5) starts the cleaning mechanism to quickly scrape the inner and outer walls of the annular heat exchanger (10), and at the same time scrapes and cleans the material in the second temperature control zone (12) to avoid material accumulation.

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