Foaming forming device for producing flame-retardant polystyrene

Abstract

This utility model relates to the technical field of foaming molding devices and discloses a foaming molding device for the production of flame-retardant polystyrene, including a reaction tank. A gantry frame is fixedly installed on the upper surface of the reaction tank, and a foaming mechanism is provided on the reaction tank. The foaming mechanism includes a first motor, a first gear, a second gear, a transmission roller, a fixed plate, a stirring rod, and a stirring blade. This foaming molding device for the production of flame-retardant polystyrene drives the first gear and the second gear to mesh and drive the transmission roller, the fixed plate, and the stirring rod to rotate, so that the stirring blade can achieve circumferential stirring. At the same time, the second motor drives the gear to mesh with the rack, and with the constraint of the collar and the fixed block, drives the stirring rod to slide up and down along the fixed plate, so as to realize the lifting and lowering motion of the stirring blade. The superposition of the two motions forms a stirring without dead angles, which can make the flame-retardant polystyrene raw materials more uniformly mixed, avoid uneven local raw material dispersion affecting the foaming effect, and lay a uniform raw material foundation for subsequent nitrogen foaming.

Description

Technical Field

[0001] This utility model relates to the technical field of foam molding equipment, specifically a foam molding equipment for the production of flame-retardant polystyrene. Background Technology

[0002] In the field of flame-retardant polystyrene production, foaming molding is the core process that determines product performance, such as density, flame retardancy, and mechanical strength. The key lies in achieving uniform mixing of raw materials and stable dispersion of nitrogen bubbles. However, the traditional foaming molding equipment currently used in the industry still has many technical pain points in actual production, which seriously restricts the quality and production efficiency of flame-retardant polystyrene products.

[0003] Traditional foaming molding equipment often employs a "single rotary stirring" design, where the stirring blades are driven by a motor to move in a circular motion at a fixed height. This stirring method has significant dead zones, especially at the bottom, edges, and middle of cylindrical reaction vessels, where the raw materials are difficult to fully agitate. For a multiphase raw material system of "solid polystyrene particles + liquid flame retardant + plasticizer," single rotary stirring cannot effectively break up the agglomeration of polystyrene particles, easily leading to residual particle diameter. Furthermore, the flame retardant tends to deposit at the bottom of the vessel due to density differences, resulting in localized areas with excessively high flame retardant concentrations and other areas with insufficient concentrations. When the raw materials are unevenly mixed, the subsequent nitrogen injection foaming stage will exhibit abnormal phenomena such as "excessive localized bubbles," areas with low flame retardant concentrations, or areas where "bubbles are difficult to form," while areas with high flame retardant concentrations will remain unaffected. Ultimately, this results in a disordered cell distribution and a density deviation exceeding 10% in the finished product, failing to meet the consistency requirements of high-end products. Therefore, a foaming molding device for flame-retardant polystyrene production is proposed. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a foaming and molding device for the production of flame-retardant polystyrene, which solves the problem of uneven mixing during the foaming and molding of flame-retardant polystyrene.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a foaming molding device for flame-retardant polystyrene production, comprising a reaction tank, wherein a gantry frame is fixedly installed on the upper surface of the reaction tank; The reaction vessel is equipped with a foaming mechanism, which includes a first motor, a first gear, a second gear, a transmission roller, a fixed plate, a stirring rod, and stirring blades. The first motor is fixedly installed on the lower surface of the gantry cross plate, and the output shaft of the first motor extends through the upper surface of the gantry. The first gear is fixedly sleeved on the outer surface of the output shaft of the first motor.

[0006] Preferably, the second gear meshes with the outer surface of the first gear, and the transmission roller is fixedly sleeved on the inner surface of the second gear; The fixing plate is fixedly installed on the lower surface of the transmission roller.

[0007] Preferably, the stirring rod is slidably sleeved on the outer surface of the fixed plate, and the stirring blade is fixedly sleeved on the outer surface of the stirring rod, with the stirring blade being arranged in a straight blade shape.

[0008] Preferably, the foaming mechanism further includes a collar, a rack, and a fixing block, wherein the collar is rotatably sleeved on the outer surface of the stirring blade, and the rack is fixedly installed on the left surface of the collar; The fixing block is fixedly installed on the opposite sides of the two vertical plates of the gantry frame, and the fixing block is slidably sleeved on the outer surface of the rack.

[0009] Preferably, the foaming mechanism further includes a gear and a second motor, the second motor being fixedly mounted on the left surface of the gantry frame vertical plate, and the output shaft of the second motor extending through the right surface of the gantry frame vertical plate; The gear is fixedly sleeved on the outer surface of the output shaft of the second motor.

[0010] Preferably, the foaming mechanism further includes a nitrogen tank, a solenoid valve, and a delivery pipe, with the output end of the delivery pipe fixedly installed on the inner surface of the top plate of the reaction tank; The nitrogen tank is fixedly installed at the inlet of the delivery pipe, and the solenoid valve is located on the outer surface of the delivery pipe.

[0011] Preferably, the stirring blades are arranged in a propeller shape.

[0012] Preferably, the stirring blades are anchored.

[0013] (III) Beneficial Effects Compared with the prior art, this utility model provides a foaming molding device for flame-retardant polystyrene production, which has the following beneficial effects: 1. This foaming molding device for flame-retardant polystyrene production uses a first motor to drive a first gear and a second gear to mesh and rotate the transmission roller, fixed plate, and stirring rod, enabling the stirring blade to perform circumferential stirring. At the same time, the second motor drives the gear to mesh with the rack, which, in conjunction with the collar and fixed block, causes the stirring rod to slide up and down along the fixed plate, achieving the lifting and lowering motion of the stirring blade. The superposition of these two motions forms a stirring without dead angles, which can make the flame-retardant polystyrene raw materials more uniformly mixed, avoiding uneven local material dispersion that affects the foaming effect, and laying a uniform raw material foundation for subsequent nitrogen foaming.

[0014] 2. This flame-retardant polystyrene foaming molding device supplies nitrogen to the reaction tank through a nitrogen tank via a delivery pipe. The solenoid valve can precisely control the nitrogen supply and delivery rate to avoid abnormal bubbles caused by excessive or insufficient nitrogen. At the same time, the stirring structure driven by the first and second motors operates continuously, which can quickly disperse the injected nitrogen into fine and uniform bubbles and fully integrate them with the raw materials. The two work together to ensure that the nitrogen is evenly distributed in the raw materials, reducing the problems of large bubbles and broken bubbles, and shortening the mixing time between bubbles and raw materials, thereby improving the efficiency of flame-retardant polystyrene foaming molding and the finished product qualification rate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a foaming molding device for producing flame-retardant polystyrene according to this utility model; Figure 2 This is a schematic diagram of the gantry structure of this utility model; Figure 3 This utility model Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 This is a schematic diagram of the nitrogen tank structure of this utility model; Figure 5 This is a schematic diagram of the internal structure of the reaction vessel of this utility model; Figure 6 This is a schematic diagram of the stirring blade structure of this utility model.

[0016] In the diagram: 1. Reaction vessel; 2. Gantry frame; 3. First motor; 4. First gear; 5. Second gear; 6. Drive roller; 7. Fixed plate; 8. Stirring rod; 9. Collar; 10. Rack; 11. Fixed block; 12. Gear; 13. Second motor; 14. Nitrogen tank; 15. Solenoid valve; 16. Delivery pipe; 17. Stirring blade. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-6This utility model provides a new technical solution: a foaming molding device for flame-retardant polystyrene production, including a reaction tank 1: as the core container of the device, it is the key place for the foaming molding of flame-retardant polystyrene raw materials. It provides a closed and stable reaction space for raw material mixing, stirring and nitrogen injection foaming, can accommodate the operation of various components of the foaming mechanism, and ensures that the entire foaming process is completed in a controllable environment. It is the basic carrier for realizing polystyrene foaming molding. Gantry 2: It is fixedly installed on the upper surface of the reaction tank 1 and plays an important supporting and load-bearing role. Its horizontal and vertical plates respectively fix key components such as the first motor 3, the second motor 13 and the fixing block 11, providing a stable installation position for these power and transmission components, ensuring that each component is accurately positioned and runs stably during operation, and ensuring the accuracy of power transmission and mechanism operation. The first motor 3 is fixed on the lower surface of the horizontal plate of the gantry frame 2. It is the power source that drives the stirring mechanism to rotate. After being powered on, its output shaft passes through the upper surface of the gantry frame 2 and drives the first gear 4 to rotate, converting electrical energy into mechanical rotational power. This provides initial power for the rotation and stirring of the subsequent transmission roller 6, stirring rod 8 and stirring blade 17. It is the core power component for realizing the stirring of raw materials. First gear 4: Fixedly sleeved on the outer surface of the output shaft of the first motor 3, it plays the role of power transmission. It meshes with the second gear 5. When the first motor 3 drives it to rotate, it can smoothly and efficiently transmit the rotational power of the first motor 3 to the second gear 5 through the meshing action between the gears, providing the power basis for the rotation of the transmission roller 6. It is an important link in the power transmission chain. The second gear 5 is meshed with the outer surface of the first gear 4, and a transmission roller 6 is fixedly sleeved on its inner surface. After receiving the rotational power transmitted by the first gear 4, it rotates itself and drives the transmission roller 6 fixed to it to rotate synchronously, realizing the conversion of power from gear transmission to roller shaft transmission, ensuring that the power can be smoothly transmitted to the subsequent fixed plate 7 and stirring components, and ensuring the normal operation of the stirring mechanism. Drive roller 6: The inner surface is fixed to the second gear 5, and the lower surface is mounted with a fixing plate 7. Driven by the second gear 5, the drive roller 6 will rotate, thereby transmitting the rotational power to the fixing plate 7 below, so that the fixing plate 7 drives the stirring rod 8 and the stirring blade 17 to rotate together. It is a key component connecting the gear drive and the stirring component, ensuring that the rotational power is effectively transmitted to the stirring end. Fixed plate 7: Fixed to the lower surface of transmission roller 6, with stirring rod 8 slidably sleeved on the outer surface. On the one hand, it rotates with transmission roller 6, transmitting rotational power to stirring rod 8, driving stirring rod 8 and stirring blade 17 to rotate and stir raw materials. On the other hand, it allows stirring rod 8 to slide on its outer surface, providing a structural basis for stirring rod 8 to move up and down in the future, taking into account both power transmission and motion guidance functions. Stirring rod 8: It is slidably sleeved on the outer surface of the fixed plate 7, and the stirring blade 17 is fixed on the outer surface. It receives the rotational power transmitted by the fixed plate 7, drives the stirring blade 17 to rotate to stir the raw materials, and can also slide up and down along the fixed plate 7 under the drive of the external mechanism, driving the stirring blade 17 to stir at different height positions in the reaction tank 1, thereby improving the uniformity of raw material mixing. It is the core transmission rod connecting the fixed plate 7 and the stirring blade 17. The collar 9 is rotatably sleeved on the outer surface of the stirring blade 17, with the rack 10 fixed on its left surface. It can rotate together with the stirring blade 17 and move up and down under the drive of the rack 10. It transmits the power of the up and down movement to the stirring blade 17 and the stirring rod 8, so that the stirring rod 8 slides along the fixed plate 7, realizing the up and down movement of the stirring components. It is the key connecting component that connects the rack 10 and the stirring blade 17. Rack 10: Fixed on the left surface of collar 9, its outer surface is slidably sleeved with fixed block 11 and meshes with gear 12. Driven by gear 12, rack 10 can slide up and down along the constraint direction of fixed block 11, thereby driving collar 9, stirring blade 17 and stirring rod 8 to move up and down synchronously, converting the rotational power of gear 12 into the linear motion of stirring component, and is the power transmission component for realizing the up and down movement of stirring component. Fixed block 11: Fixed to the opposite surfaces of the two vertical plates of the gantry frame 2, with a sliding rack 10. It guides and limits the movement of the rack 10, ensuring that the rack 10 can only slide up and down in the vertical direction, preventing the rack 10 from deviating or shaking during the movement, ensuring that the rack 10 drives the stirring component to move up and down stably and accurately, and improving the stability of the mechanism. Gear 12: It is fixedly sleeved on the outer surface of the output shaft of the second motor 13 and meshes with the rack 10. Under the drive of the second motor 13, the gear 12 rotates and, through meshing with the rack 10, converts the rotational power of the second motor 13 into the vertical linear motion of the rack 10, providing power for the rack 10 to drive the stirring component to move up and down. It is the core component for power conversion to realize the up and down movement of the stirring component. The second motor 13 is fixed on the left surface of the vertical plate of the gantry frame 2. Its output shaft passes through the right surface of the vertical plate and fixes the gear 12. It is the power source that drives the stirring component to move up and down. After being powered on, the output shaft drives the gear 12 to rotate, converting electrical energy into the rotational power of the gear 12, providing initial power for the subsequent up and down movement of the rack 10, collar 9 and stirring component, and cooperating with the first motor 3 to realize the compound movement of the stirring component. Nitrogen tank 14: Fixed at the input end of the conveying pipe 16, it is a storage container for nitrogen. It stores nitrogen for polystyrene foaming and can continuously and stably provide nitrogen raw materials for the entire foaming process. The nitrogen is transported to the reaction tank 1 through the conveying pipe 16 to provide the necessary gas medium for polystyrene foaming. It is the gas supply source to ensure the smooth progress of the foaming process. Solenoid valve 15: Located on the outer surface of delivery pipe 16, it controls the delivery of nitrogen. By controlling the opening and closing of solenoid valve 15, the flow of nitrogen from nitrogen tank 14 through delivery pipe 16 into reaction tank 1 can be adjusted. At the same time, the nitrogen delivery rate can be controlled by adjusting the valve opening, so as to accurately control the amount and rhythm of nitrogen injection in reaction tank 1 and ensure foaming effect. Delivery pipe 16: The output end is fixed to the inner surface of the top plate of the reaction tank 1, and the input end is connected to the nitrogen tank 14. It is the channel for nitrogen delivery, which can stably and efficiently deliver the nitrogen in the nitrogen tank 14 to the inside of the reaction tank 1, ensuring that the nitrogen can be evenly distributed in the raw materials, providing a gas transmission path for the foaming of polystyrene raw materials, and is a key pipe connecting the nitrogen source and the reaction space. Stirring blade 17: It is fixedly sleeved on the outer surface of the stirring rod 8. There are three types of settings: straight blade, propeller type, and anchor type. It rotates and moves up and down with the stirring rod 8 and directly contacts the flame-retardant polystyrene raw material in the reaction tank 1. It stirs and mixes the raw material by rotating itself. Different shapes of stirring blades are adapted to different raw material states to ensure that the raw material is mixed evenly, laying the foundation for subsequent foaming and molding.

[0019] This flame-retardant polystyrene foaming molding device adds flame-retardant polystyrene raw materials into reaction tank 1, closes the sealing cover of reaction tank 1, ensures that solenoid valve 15 is in the closed state, and stirrer blade 17 is at its initial height. The first motor 3 is started, and its output shaft drives the first gear 4 to rotate. The first gear 4 meshes with and drives the second gear 5 to rotate, which in turn drives the transmission roller 6 to rotate. The transmission roller 6, through a fixed plate 7, drives the stirring rod 8 to rotate. The stirring rod 8 drives the stirring blade 17 to rotate within the reaction tank 1, performing preliminary mixing of the raw materials. The second motor 13 is then started, and its output shaft drives the gear 12 to rotate. The gear 12 meshes with and drives the rack 10 to slide up and down along the fixed block 11. The rack 10, through a collar 9, drives the stirring rod 8 to move up and down along the fixed plate 7, thereby causing the stirring blade 17 to move up and down while rotating, expanding the mixing range and ensuring uniform mixing of the raw materials. (During this process...) The rotation direction of the stirring blade 17 is coordinated with the lifting direction to avoid dead zones in the mixing of raw materials. When the raw materials are mixed to the preset time or state, the first motor 3 and the second motor 13 are kept running, the solenoid valve 15 is opened, and the nitrogen in the nitrogen tank 14 is continuously transported to the reaction tank 1 through the conveying pipe 16. After the nitrogen enters the reaction tank 1, it is fully mixed with the raw materials under the stirring action of the rotating stirring blade 17 and forms small and uniform bubbles. As the nitrogen continues to be input and the stirring motion continues, the bubbles gradually fill the interior of the raw materials, causing the raw materials to expand in volume and finally form flame-retardant polystyrene in a foamed state. When the foaming process reaches the preset requirements, the solenoid valve 15 is closed to stop the nitrogen supply, and then the first motor 3 and the second motor 13 are turned off to stop the stirring and lifting motion. After the foamed raw materials in the reaction tank 1 cool and solidify, the foaming and molding of flame-retardant polystyrene can be completed. The molded products can be taken out through the discharge structure of the reaction tank 1. Example 1: Straight-blade stirring blade 17, initial mixing scenario of flame-retardant polystyrene raw materials. like Figure 4 In the initial stage of flame-retardant polystyrene production, solid polystyrene particles, flame retardants (such as brominated flame retardants), and liquid plasticizers need to be added to reaction tank 1 in proportion. At this time, the raw materials are in a mixed state, and the core requirement is to quickly break up particle agglomeration and achieve initial dispersion of each component. The straight-blade stirring blade 17 is fixedly sleeved on the outer surface of the stirring rod 8. After the sealing cover of the reaction vessel 1 is closed, the first motor 3 is started. The first motor 3 drives the transmission roller 6 to rotate through the first gear 4 and the second gear 5, thereby causing the fixed plate 7 and the stirring rod 8 to drive the straight-blade stirring blade 17 to make a circular motion. At the same time, the second motor 13 is started. Through the meshing transmission of the gear 12 and the rack 10, the stirring blade 17 is driven to move up and down vertically at a low speed. The blades of the straight-blade stirring blade 17 are perpendicular to the axis of the stirring rod. When rotating, it can cut the raw materials. The stirring and lifting motion covers the raw material area from the bottom to the middle of the reaction vessel 1. The vertical blades of the straight-bladed stirring blade 17 can directly impact the agglomerated polystyrene particles, breaking up the 5-10mm diameter particle clusters into individual particles. At the same time, it promotes the flow of liquid plasticizer between the particles. The raw materials can be evenly dispersed within 30 minutes. Compared with other shapes, the impact of the straight-bladed stirring blade can quickly destroy the adsorption force between particles, and its simple structure makes it less likely to entangle the raw materials. It is suitable for the needs of the initial mixing stage and lays the foundation for subsequent nitrogen foaming.

[0020] Example 2: Propeller-type stirring blade 17, key stage scenario of nitrogen foaming like Figure 5 After the flame-retardant polystyrene raw materials are initially mixed to form a uniform paste, the core stage of nitrogen foaming begins. At this time, nitrogen needs to be injected into the reaction tank 1 through the delivery pipe 16. The core requirement is to quickly disperse the nitrogen into fine bubbles and distribute them evenly in the material, while preventing bubble aggregation or breakage. The stirring blades 17 on the outer surface of the stirring rod 8 are replaced with propeller-type blades. The speed of the first motor 3 is increased, while the lifting speed of the second motor 13 driving the stirring blades 17 is reduced. The solenoid valve 15 is opened to control the nitrogen tank 14 to inject nitrogen into the reaction tank 1 through the delivery pipe 16. The nitrogen injection point is located below the rotation trajectory of the propeller-type stirring blades 17, and the blades of the propeller-type stirring blades 17 are at a 30° angle. The tilt angle creates a spiral upward flow in the material during rotation, carrying the injected nitrogen upward. At the same time, the shear force at the blade edge breaks up the nitrogen. The spiral structure of the propeller-type stirring blade 17 generates a stable axial circulation, allowing the nitrogen to form a circulating path in the material and preventing it from floating directly upward and escaping. The tilt angle design of the blade concentrates the shear force at the blade edge, breaking the nitrogen into small bubbles. The circulation effect allows the bubbles to be evenly distributed throughout the entire reaction vessel 1 within 15 minutes. In addition, the stirring resistance of the propeller-type stirring blade is small, and the material temperature will not rise abnormally due to high-speed rotation, ensuring the stability of nitrogen foaming. The uniformity of the final product is improved compared to the straight blade type.

[0021] Example 3: Anchor-type stirring blade 17, high-viscosity flame retardant addition scenario like Figure 6Some high-end flame-retardant polystyrene products require the addition of high-viscosity flame retardants. These flame retardants tend to deposit at the bottom of reaction tank 1 and can easily stick to the walls or agglomerate when mixed with paste-like materials. The core requirement is to scrape the deposited high-viscosity flame retardant off the tank wall and fully integrate it into the material, while avoiding stratification caused by excessive stirring. The stirring blade 17 is replaced with an anchor type, whose blade shape fits the inner wall of reaction tank 1. The speed of the first motor 3 is adjusted to a low-speed circular motion, and the second motor 13 is turned off to fix the stirring blade 17 at a height of 20mm from the bottom of reaction tank 1. The high-viscosity flame retardant is slowly injected through the feed port at the top of reaction tank 1, and the anchor-type stirring blade 17 moves with the stirring rod. 8. Rotation: The blade edges adhere to the tank wall in a circular motion. The annular contact structure of the anchor-type stirring blade 17 can directly scrape off the material adhering to the inner wall of the reaction tank 1, preventing the high-viscosity flame retardant from solidifying on the tank wall. At the same time, the radial thrust generated by the low-speed rotation can push the flame retardant deposited at the bottom upwards, forming a convective mixture with the upper paste-like material. The high-viscosity flame retardant can be completely dispersed within 25 minutes. Compared with the straight-blade cutting type and propeller-type circulation, the dual function of the anchor-type stirring blade in scraping the wall and pushing the flow is more suitable for the mixing needs of high-viscosity materials. Moreover, the low-speed rotation will not damage the colloidal structure of the material, avoiding the decrease in foaming performance caused by over-stirring.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foaming molding apparatus for flame-retardant polystyrene production, comprising a reaction vessel (1), characterized in that: A gantry frame (2) is fixedly installed on the upper surface of the reaction vessel (1). The reaction vessel (1) is equipped with a foaming mechanism, which includes a first motor (3), a first gear (4), a second gear (5), a transmission roller (6), a fixed plate (7), a stirring rod (8), and a stirring blade (17). Among them, the first motor (3) is fixedly installed on the lower surface of the horizontal plate of the gantry frame (2), and the output shaft of the first motor (3) passes through the upper surface of the gantry frame (2); The first gear (4) is fixedly sleeved on the outer surface of the output shaft of the first motor (3).

2. The foaming molding apparatus for flame-retardant polystyrene production according to claim 1, characterized in that: The second gear (5) meshes with the outer surface of the first gear (4), and the transmission roller (6) is fixedly sleeved on the inner surface of the second gear (5); The fixing plate (7) is fixedly installed on the lower surface of the transmission roller (6).

3. The foaming molding apparatus for flame-retardant polystyrene production according to claim 1, characterized in that: The stirring rod (8) is slidably sleeved on the outer surface of the fixed plate (7), and the stirring blade (17) is fixedly sleeved on the outer surface of the stirring rod (8). The stirring blade (17) is arranged in a straight blade shape.

4. The foaming molding apparatus for flame-retardant polystyrene production according to claim 1, characterized in that: The foaming mechanism also includes a collar (9), a rack (10) and a fixing block (11). The collar (9) is rotatably sleeved on the outer surface of the stirring blade (17), and the rack (10) is fixedly installed on the left surface of the collar (9). Among them, the fixing block (11) is fixedly installed on the opposite side of the two vertical plates of the gantry frame (2), and the fixing block (11) is slidably sleeved on the outer surface of the rack (10).

5. The foaming molding apparatus for flame-retardant polystyrene production according to claim 1, characterized in that: The foaming mechanism also includes a gear (12) and a second motor (13). The second motor (13) is fixedly installed on the left surface of the vertical plate of the gantry frame (2), and the output shaft of the second motor (13) passes through the right surface of the vertical plate of the gantry frame (2). Among them, the gear (12) is fixedly sleeved on the outer surface of the output shaft of the second motor (13).

6. The foaming molding apparatus for flame-retardant polystyrene production according to claim 1, characterized in that: The foaming mechanism also includes a nitrogen tank (14), a solenoid valve (15) and a delivery pipe (16), the output end of which is fixedly installed on the inner surface of the top plate of the reaction tank (1); The nitrogen tank (14) is fixedly installed at the input end of the delivery pipe (16), and the solenoid valve (15) is set on the outer surface of the delivery pipe (16).

7. The foaming molding apparatus for flame-retardant polystyrene production according to claim 1, characterized in that: The stirring blade (17) is arranged in a propeller shape.

8. The foaming molding apparatus for flame-retardant polystyrene production according to claim 1, characterized in that: The stirring blade (17) is anchored.

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