High temperature resistant yellowing resistant polyester resin melt polymerization reaction equipment and temperature control method

Abstract

This invention discloses a melt polymerization reaction device for high-temperature resistant and anti-yellowing polyester resin, including a support base, a conveying track at the rear end of the support base, a tank between the support bases, a movable cover on the top of the tank, a transmission frame inside the conveying track, a fixed fork connecting the movable cover outside the transmission frame, a welding seat on the top of the movable cover, a control motor on the welding seat, a drive shaft at the bottom of the control motor, a set of push rod motors on the top of the welding seat, a stirring frame at the bottom of the push rod motors, a connecting frame for stirring and mixing outside the drive shaft, a transmission beam at the bottom of the drive shaft, and scraper frames at both ends of the transmission beam. Compared with the prior art, the advantages of this invention are that it integrates adjustable angle stirring, layered temperature measurement, reciprocating separation anti-caking, automatic wall scraping, and easy maintenance structure to meet the synthesis requirements of high-temperature resistant and anti-yellowing polyester resin. By precisely controlling the material temperature difference and the inner wall deposits, it effectively inhibits thermal yellowing, ensures product performance consistency, and is suitable for the efficient and stable production of high-quality polyester resin.

Description

Technical Field

[0001] This invention relates to the field of reaction vessel technology, and in particular to melt polymerization equipment and temperature control method for high-temperature resistant and yellowing-resistant polyester resin. Background Technology

[0002] Polyester resin is a high molecular weight compound produced by the polycondensation reaction of diols and diacids. It includes two main categories: saturated polyester resin and unsaturated polyester resin. Due to its excellent mechanical properties, heat resistance and processing performance, it is widely used in powder coatings, automotive parts, electronic packaging, fiber materials and other fields.

[0003] With the increasing demands for material performance in high-end fields such as electronics, automotive, and aerospace, polyester resins that combine high-temperature resistance and anti-yellowing properties have become a hot research and development area in the industry. In particular, the demand for high-temperature resistant and anti-yellowing polyester resins is becoming increasingly urgent for products with strict requirements for color stability.

[0004] Melt polymerization, also known as melt polycondensation, is one of the main methods for the industrial production of polyester resins. This method is carried out under high temperature, reduced pressure, and inert gas protection. By gradually increasing the vacuum degree, small molecule by-products are removed, and the reaction equilibrium is shifted towards the product direction, thereby obtaining high molecular weight polyester products. However, in the existing technology, the temperature distribution in the reactor is uneven, the heat and mass transfer efficiency is low, the viscosity of the system increases sharply in the later stage of the melt polymerization reaction, and the material flowability and heat transfer performance decrease significantly. Under high viscosity conditions, it is difficult to achieve uniform mixing and heat transfer throughout the reactor. There is a significant temperature difference between the center and the near-wall area of ​​the reactor, which not only affects the consistency of product performance, but also exacerbates the risk of yellowing in local areas due to heat accumulation. Temperature fluctuations have a significant impact on product quality. Temperature control methods are limited, and existing reactors rely on a single temperature sensor for feedback, which is difficult to effectively cope with the control disturbances caused by changes in the thermophysical parameters of the system during polymerization, resulting in inaccurate temperature control and significant temperature fluctuations. The synthesis of high-temperature resistant and anti-yellowing polyester resin is extremely sensitive to temperature changes. Therefore, a melt polymerization reaction equipment and temperature control method for high-temperature resistant and anti-yellowing polyester resin are proposed. Summary of the Invention

[0005] This invention addresses the problems of inaccurate temperature control and low stirring efficiency by providing melt polymerization equipment and temperature control method for high-temperature resistant and yellowing-resistant polyester resin.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a melt polymerization reaction device for high-temperature resistant and yellowing-resistant polyester resin, including a support base; The rear end of the support base is provided with a conveying rail, the tank is provided between the support bases, the top of the tank is provided with a movable cover, the inside of the conveying rail is provided with a transmission frame, and the outside of the transmission frame is provided with a fixed fork that connects to the movable cover. The movable cover has a welding seat on top, a control motor on the welding seat, a drive shaft at the bottom of the control motor, a set of push rod motors on top of the welding seat, a stirring frame at the bottom of the push rod motors, a connecting frame for stirring and mixing outside the drive shaft, a transmission beam at the bottom of the drive shaft, and scraper frames at both ends of the transmission beam. Designed to meet the synthesis requirements of high-temperature resistant and anti-yellowing polyester resin, it integrates adjustable angle stirring, layered temperature measurement, reciprocating separation to prevent clumping, automatic wall scraping, and an easy-to-maintain structure. By precisely controlling the material temperature difference and inner wall deposits, it effectively suppresses thermal yellowing, ensures consistent product performance, and is suitable for the efficient and stable production of high-quality polyester resin.

[0007] A further preferred embodiment of the present invention is as follows: The tank body is provided with snap-fit ​​brackets at both ends, and the snap-fit ​​brackets are located at the top of the support base for tank support; the tank body is provided with a discharge pipe at the bottom; the movable cover is provided with several feed pipes at the top; and the tank body is provided with an annular heating chamber to achieve stable support of the tank body and flexible material entry and exit. Material is supplied through the feed pipes and discharged through the discharge pipes, and the vacuum level is gradually increased with the help of external air pressure equipment to effectively remove small molecule by-products. Combined with heat exchange in the annular heating chamber, the internal temperature of the reactor is precisely increased, providing a controllable thermal environment for melt polymerization.

[0008] A further preferred embodiment of the present invention is as follows: a transmission rod is inserted inside the drive shaft, and a plurality of snap-fit ​​grooves are opened on the transmission rod at the position corresponding to the connecting frame. Transmission teeth are connected inside the snap-fit ​​grooves, and a plurality of sealing blocks are connected to the outside of the connecting frame. The positions of the sealing blocks correspond to the snap-fit ​​grooves. A rotating shaft is inserted inside the sealing block. A transmission gear ring is provided at the bottom of the rotating shaft and abuts against the inside of the snap-fit ​​groove. The rotating shaft rotates as it meshes with the transmission gear ring and the transmission gear plate. This is used to adjust the stirring angle. By controlling the position of the transmission rod, the stirring angle can be dynamically adjusted, thereby optimizing the mixing efficiency according to the actual situation inside the reactor, maintaining uniform material temperature, avoiding excessive local temperature differences, reducing the risk of yellowing due to heat accumulation, and improving product consistency.

[0009] A further preferred embodiment of the present invention is as follows: a connecting plate is provided outside the rotating shaft, and a stirring ring is installed on one side of the connecting plate. The installation angle of the stirring ring is adjustable, and the stirring ring is eccentrically set with respect to the inner hole. The stirring efficiency can be flexibly controlled by changing the rotation angle to adapt to the mixing requirements of different reaction stages.

[0010] A further preferred embodiment of the present invention is as follows: a telescopic shaft is movably inserted inside the stirring rack, the telescopic shaft is installed at the bottom of the output end of the push rod motor, a fixed frame is connected to the bottom of the telescopic shaft, the fixed frame is annular and has several transmission grooves on its edge, and several separation plates are movably arranged inside the transmission grooves. A temperature sensing mechanism is provided at the bottom of the fixed frame for feedback of the internal melting temperature. By driving the telescopic shaft with the push rod motor, the temperature sensing mechanism can extend into the material at different depths to provide real-time feedback of the melting temperature of each area. The speed of the drive shaft is dynamically adjusted according to the feedback data, effectively reducing the material temperature difference and avoiding the feedback lag and deviation of traditional fixed temperature measurement.

[0011] A further preferred embodiment of the present invention is as follows: a rotating frame is movably mounted outside the telescopic shaft. The rotating frame consists of a set of fixed rings and several arc-shaped stirring blades. An elliptical transmission disk is installed at the bottom of the rotating frame. The transmission disk is eccentrically positioned with respect to the telescopic shaft and rotates with the rotating frame. A push rod penetrating the fixed frame is provided at the top of the separation plate. A straight groove for the movement of the push rod is provided on the fixed frame. An elliptical guide groove is opened at the bottom of the transmission disk, and the top of the push rod is positioned inside the guide groove. When the rotating frame rotates, it stirs the material to prevent agglomeration during the melting process. At the same time, the eccentrically positioned transmission disk drives the separation plate to reciprocate, extruding and dispersing the powdered raw materials, accelerating melting and promoting uniform temperature.

[0012] A further preferred embodiment of the present invention is as follows: a set of movable cavities is provided at the bottom of the transmission beam, a push plate is movably arranged inside the movable cavities, a scraper frame is installed at the bottom of the push plate, a hollow box is installed on the side of the scraper frame near the drive shaft, a rectangular groove is opened on the scraper frame, an air inlet is provided at the bottom of the hollow box, and a sealing gasket is provided inside the air inlet, a conveying channel is provided inside the hollow box, and several piston push rods are symmetrically arranged on the output port of the conveying channel, a reset end block is connected to the outside of the piston push rod, the reset end block is locked inside the rectangular groove, several connecting pipes are provided outside the hollow box, and the reset end block is sleeved on the outside of the connecting pipes. After the sealing gasket is removed, the piston push rod is driven by external air pressure to push the reset end block outward, straightening and limiting the cleaning plate, which facilitates the subsequent thorough cleaning of the inner wall of the equipment.

[0013] A further preferred embodiment of the present invention is as follows: a cleaning plate is provided on the outside of the scraper frame, and a plurality of elastic reset pins are connected to one end of the cleaning plate. The reset pins are installed inside the connecting pipe. A plurality of temperature sensing modules are provided at the front end of the cleaning plate. The push plate drives the scraper frame to move outward, so that the cleaning plate abuts against the inner wall of the reactor. The elastic scraper scrapes off the adhering material with circumferential movement, preventing it from drying and burning due to continuous heating. The temperature sensing modules monitor the wall temperature in real time and, in conjunction with the internal temperature feedback curve, coordinate the control of stirring efficiency and heating rate.

[0014] A further preferred embodiment of the present invention is as follows: a set of symmetrically arranged docking grooves are provided at the front end of the cleaning plate, and several elastic scrapers are engaged inside the docking grooves. The elastic scrapers are evenly distributed at both ends of the cleaning plate. Several positioning pins are provided on the elastic scrapers. The elastic scrapers are designed to be equipped with connecting protrusions. The reset end block presses against the connecting protrusions on the elastic scrapers outward, causing the scrapers to deform outward, thereby creating a gap between the adhered material layer and the scrapers, which facilitates cleaning and peeling. The elastic scrapers adopt a modular design and can be replaced individually after local wear without the need for overall disassembly, significantly reducing maintenance costs and wear.

[0015] Temperature control methods for melt polymerization equipment of high-temperature resistant and yellowing-resistant polyester resin, including; Step 1: External heat exchange medium is circulated and heated. The heating medium is filled into the annular heating chamber outside the tank and heat exchange occurs, gradually increasing the overall temperature inside the reactor to provide a basic heat source for melt polymerization while avoiding local overheating. Step 2: A height-adjustable temperature sensing mechanism provides feedback on the internal temperature difference. The stirring rack has a telescopic shaft inside, with a temperature sensing mechanism installed at the bottom. A push rod motor drives it to extend into materials at different depths, collecting real-time melting temperature data for each layer and feeding it back to the control system. This data is used to dynamically adjust the drive shaft speed, reducing the internal temperature difference within the material. Step 3: Near-wall temperature monitoring and stirring efficiency linkage control. Multiple temperature sensing modules are installed at the front end of the scraper frame to monitor the temperature of the area near the inner wall of the reactor in real time. This data, in conjunction with the internal temperature sensing mechanism, generates an overall heating curve, which is then used to adjust the stirring ring angle, connecting plate position, and rotation speed to optimize heat transfer uniformity. Step 4: The adjustable-angle stirring ring eliminates localized heat accumulation. By controlling the position of the transmission rod, the transmission gear ring at the bottom of the rotating shaft engages with the locking groove, changing the installation angle and eccentricity of the connecting plate and stirring ring. The stirring direction and intensity are adjusted based on real-time temperature feedback to prevent excessive localized temperature differences in the gel-like material due to uneven mixing, thus reducing the risk of yellowing. Step 5: The reciprocating motion of the separating plate accelerates melting and temperature uniformity. The rotating frame drives the eccentrically positioned transmission disc to rotate, pushing the separating plate on the fixed frame to reciprocate along the straight groove. This action compresses and disperses the powdered raw material, breaks up agglomerates, accelerates the melting speed, and promotes rapid heat transfer in the material, maintaining a uniform overall temperature.

[0016] Compared with the prior art, the advantages of the present invention are as follows: 1. This invention, through the transmission rod and snap-fit ​​groove structure inside the drive shaft, can control the installation angle of the stirring ring, adjust the stirring efficiency in real time according to the state of the material in the reactor, ensure the uniform temperature of the gel-like material, and effectively reduce the risk of yellowing caused by local temperature differences.

[0017] 2. The stirring rack in this invention is equipped with a temperature sensing mechanism that can be raised and lowered, which can extend into materials at different depths to provide real-time feedback on the melting temperature. This overcomes the blind spot of fixed temperature measuring points, provides a basis for adjusting the speed of the drive shaft, and keeps the temperature difference within a reasonable range.

[0018] 3. This invention uses a rotating frame to drive an eccentrically positioned transmission disc, which in turn drives the separation plate to reciprocate, extruding and dispersing the powdered raw materials. This reduces internal clumping, accelerates the melting speed, and helps maintain a uniform overall temperature of the material.

[0019] 4. In this invention, the scraper frame can push the cleaning plate outward, so that the high-temperature resistant elastic scraper blades fit against the inner wall of the tank and continuously clean the attached material during the circumferential motion, avoiding drying and scorching due to prolonged heating and improving product quality.

[0020] 5. In this invention, the movable cover can be lifted by the transmission frame, and in conjunction with the piston push rod and reset end block structure on the scraper frame, the elastic scraper is deformed to create a gap, which facilitates the peeling off of surface adhering substances; and the scraper can be replaced individually, significantly reducing equipment maintenance costs. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as a limitation on the scope of the present invention. In addition, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the separation structure of the tank body and the sealing cap of the present invention; Figure 3 This is a schematic diagram of the bottom structure of the sealing cap of the present invention; Figure 4 This is a schematic diagram of the external structure of the drive shaft of the present invention; Figure 5 This is a schematic diagram of the exploded disassembly structure of the drive shaft of the present invention; Figure 6 For the present invention Figure 5 A magnified view of the structure at point A in the middle; Figure 7 This is a schematic diagram of a partial structure of the transmission beam of the present invention; Figure 8 For the present invention Figure 7 A magnified schematic diagram of the structure at point B in the middle; Figure 9 This is a schematic diagram of the exploded disassembly structure of one side of the scraper frame of the present invention; Figure 10 This is a partial structural diagram of the cleaning plate of the present invention; Figure 11 This is a schematic diagram of the bottom structure of the stirring rack of the present invention; Figure 12 This is a schematic diagram of the temperature control method of the present invention.

[0023] In the diagram: 1. Support base; 2. Tank body; 3. Drive shaft; 4. Stirring frame; 5. Transmission beam; 11. Conveying track; 12. Transmission frame; 21. Movable cover; 22. Welding seat; 23. Feed pipe; 31. Connecting frame; 32. Transmission rod; 33. Snap-fit ​​groove; 34. Rotating shaft; 341. Connecting plate; 35. Sealing block; 36. Stirring ring; 41. Telescopic shaft; 42. Rotating frame; 43. Transmission disc; 44. Fixed frame; 45. Separation plate; 51. Movable cavity; 511. Push plate; 52. Scraper frame; 53. Hollow box; 531. Sealing gasket; 532. Piston push rod; 533. Connecting pipe; 54. Reset end block; 55. Cleaning plate; 551. Reset retaining pin; 56. Elastic scraper; 561. Connecting protrusion; 57. Temperature sensing module. Detailed Implementation

[0024] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0025] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0026] Example 1, please refer to Figures 1-11 Specifically, the equipment for melt polymerization of high-temperature resistant and yellowing-resistant polyester resin includes a support base 1. A conveying track 11 is provided at the rear end of the support base 1, a tank 2 is provided between the support bases 1, a movable cover 21 is provided on the top of the tank 2, a transmission frame 12 is movably engaged inside the conveying track 11, and a fixed fork is provided outside the transmission frame 12 to connect the movable cover 21. The movable cover 21 has a welding seat 22 on top, a control motor on the welding seat 22, and a drive shaft 3 at the bottom of the control motor. A set of push rod motors is installed on top of the welding seat 22, and a stirring frame 4 is installed at the bottom of the push rod motors. A connecting frame 31 for stirring and mixing is installed outside the drive shaft 3. A transmission beam 5 is installed at the bottom of the drive shaft 3, and scraper frames 52 are installed at both ends of the transmission beam 5. In order to meet the synthesis requirements of high temperature resistant and anti-yellowing polyester resin, it integrates adjustable angle stirring, layer temperature measurement, reciprocating separation anti-caking, automatic wall scraping and easy maintenance structure. By accurately controlling the temperature difference of the material and the inner wall adhering substances, it effectively inhibits thermal yellowing and ensures the consistency of product performance. It is suitable for the efficient and stable production of high-quality polyester resin.

[0027] like Figure 1 and Figure 2 As shown, the tank body 2 is equipped with snap-fit ​​brackets at both ends, and the snap-fit ​​brackets are located at the top of the support base 1 for supporting the tank body 2. The bottom of the tank body 2 is equipped with a discharge pipe, which can be used to discharge the reacted materials. The top of the movable cover 21 is equipped with several feed pipes 23, which can be used to supply materials. In the subsequent reaction process, with the help of external air pressure equipment, small molecule by-products such as water and methanol are removed by gradually increasing the vacuum degree. The tank body 2 is equipped with an annular heating chamber, and the heating chamber is equipped with a corresponding heating medium to increase the temperature inside the reactor through heat exchange.

[0028] like Figure 4 and Figure 5 As shown, a transmission rod 32 is inserted inside the drive shaft 3. Several locking grooves 33 are opened on the transmission rod 32 at the position corresponding to the connecting frame 31. Transmission teeth are connected inside the locking grooves 33. Several sealing blocks 35 are connected to the outside of the connecting frame 31. The positions of the sealing blocks 35 correspond to the locking grooves 33. A rotating shaft 34 is inserted inside the sealing block 35. A transmission gear ring is located at the bottom of the rotating shaft 34 and abuts against the inside of the locking groove 33. The rotating shaft 34 rotates following the meshing of the transmission gear ring and transmission gear plate, used to adjust the stirring angle. During equipment operation, the position of the transmission rod 32 can be controlled according to the conditions inside the reactor. Under the cooperation of the transmission gear ring and transmission gear plate, it drives the external rotating shaft 34 to rotate in a circular motion. The angle of the external connecting plate 341 can be controlled, thereby controlling the stirring angle and adjusting the mixing efficiency according to actual needs. This maintains a consistent temperature of the internal materials during the reaction, avoiding large temperature differences in the gel-like materials. Large temperature differences not only affect the consistency of product performance but also easily exacerbate the risk of yellowing due to heat accumulation in local areas. Therefore, controlling the stirring and mixing efficiency and controlling the internal temperature difference can reduce the impact of temperature fluctuations on product quality.

[0029] like Figure 5 and Figure 6 As shown, a connecting plate 341 is provided on the outside of the rotating shaft 34, and a stirring ring 36 is installed on one side of the connecting plate 341. The installation angle of the stirring ring 36 is adjustable. The stirring ring 36 is eccentrically set with the inner hole. The connecting plate 341 can rotate with the rotating shaft 34, thereby controlling the internal stirring efficiency. The stirring ring 36 can also control the rotation angle during installation.

[0030] like Figure 11 As shown, a telescopic shaft 41 is movably inserted inside the stirring rack 4. The telescopic shaft 41 is installed at the bottom of the output end of the push rod motor. A fixed frame 44 is connected to the bottom of the telescopic shaft 41. The fixed frame 44 is annular and has several transmission grooves on its edge. Several separation plates 45 are movably arranged inside the transmission grooves. A temperature sensing mechanism is provided at the bottom of the fixed frame 44 to provide feedback on the internal melting temperature. During the reaction of materials inside the reactor, the telescopic shaft 41 can follow the push rod motor at the top. The temperature sensing mechanism at the bottom can be set in materials at different depths to provide real-time feedback on the corresponding reaction temperature. Compared with the traditional fixed setting, this can reduce the inconsistency of temperature feedback at different locations during the mixing of gel-like materials, provide more specific feedback on the internal mixing situation, and adjust the speed of the drive shaft 3 based on the real-time feedback to keep the temperature difference of the material within a reasonable range.

[0031] like Figure 11 As shown, a rotating frame 42 is movably mounted on the outside of the telescopic shaft 41. The rotating frame 42 consists of a set of fixed rings and several arc-shaped stirring blades. An elliptical transmission disk 43 is installed at the bottom of the rotating frame 42. The transmission disk 43 is eccentrically positioned with the telescopic shaft 41 and rotates with the rotating frame 42. A push rod is provided at the top of the separation plate 45, penetrating through the fixed frame 44. The fixed frame 44 is provided with a straight groove for the movement of the push rod. An elliptical guide rail groove is opened at the bottom of the transmission disk 43, and the top of the push rod is set inside the guide rail groove. During the operation of the equipment, the material entering the equipment can be stirred by the rotation of the rotating frame 42, reducing the internal agglomeration during the melting process. As the rotating frame 42 at the top moves in a circular motion, it can drive the transmission disk 43 at the bottom to rotate, which can drive the separation plate 45 at the bottom to reciprocate, which can squeeze and separate the powdery raw materials, reduce the internal agglomeration, accelerate the internal melting speed, and maintain a consistent temperature.

[0032] like Figure 7 and Figure 8As shown, a set of movable cavities 51 are provided at the bottom of the transmission beam 5. A pusher plate 511 is movably arranged inside the movable cavities 51. A scraper frame 52 is installed at the bottom of the pusher plate 511. A hollow box 53 is installed on the side of the scraper frame 52 near the drive shaft 3. A rectangular groove is opened on the scraper frame 52. An air inlet is provided at the bottom of the hollow box 53, and a sealing gasket 531 is provided inside the air inlet. A conveying channel is provided inside the hollow box 53, and several piston push rods 532 are symmetrically arranged on the output port of the conveying channel. A reset end block 54 is connected to the outside of the piston push rod 532. Block 54 is fitted inside the rectangular groove. Several connecting pipes 533 are provided on the outside of the hollow box 53. The reset end block 54 is sleeved on the outside of the connecting pipes 533. During subsequent cleaning and maintenance, it can move with the help of the external transmission frame 12 with the movable cover 21, which facilitates the cleaning and maintenance of the drive shaft 3 and the stirring frame 4. After the sealing gasket block 531 is disassembled, with the cooperation of the external air pressure equipment, the piston push rod 532 can drive the reset end block 54 to move outward, which is used to press against one end of the cleaning plate 55, so that it is in a restricted and straightened state, which facilitates subsequent cleaning and maintenance.

[0033] like Figure 9 and Figure 10 As shown, a cleaning plate 55 is provided on the outside of the scraper frame 52. One end of the cleaning plate 55 is connected to several elastic reset pins 551, which are installed inside the connecting pipe 533. Several temperature sensing modules 57 are provided at the front end of the cleaning plate 55. During the operation of the equipment, with the cooperation of the push plate 511, the scraper frame 52 is driven to move outward, and the cleaning plate 55 is pressed against the edge of the reactor. With the help of the elastic scraper 56 made of high temperature resistant material, it adheres to the inner wall of the reactor. During the circumferential movement, the edge is cleaned, reducing the situation where material adheres to the inner wall of the reactor and continues to be heated, which may cause drying and scorching, affecting the overall processing quality. In addition, the temperature sensing modules 57 monitor the temperature of the heating area in real time, which can control the internal temperature rise and reaction efficiency. With the feedback of the temperature sensing mechanism, the internal temperature rise curve is controlled, thereby controlling the internal stirring efficiency.

[0034] like Figure 9 and Figure 10As shown, the front end of the cleaning plate 55 has a set of symmetrically arranged docking grooves, and several elastic scrapers 56 are locked inside the docking grooves. The elastic scrapers 56 are evenly distributed at both ends of the cleaning plate 55. Several positioning pins are provided on the elastic scrapers 56. The elastic scrapers 56 are conveniently provided with connecting protrusions 561. During the maintenance and cleaning of the equipment, they can move outward with the help of the reset end block 54 and abut against the connecting protrusions 561 on the outside of the elastic scraper 56. When the cleaning plate 55 is in the limiting and pressing position, it drives the elastic scraper 56 to deform outward, which can create gaps in the material layer adhering to the surface, making it easier to clean and peel off later. When the elastic scraper 56 is locally worn, it can be replaced individually without the need for overall disassembly and maintenance, reducing the maintenance cost and wear of the equipment.

[0035] Example 2, please refer to Figure 12 Specifically, the temperature control method for melt polymerization equipment of high-temperature resistant and anti-yellowing polyester resin includes: Step 1: External heat exchange medium circulates and heats up The tank 2 is equipped with an annular heating chamber on the outside, which is filled with a heating medium such as heat transfer oil. Before the reaction starts, the medium is heated to a predetermined temperature through an external circulating heating system. The medium exchanges heat with the inner wall of the tank 2, gradually increasing the overall temperature of the material in the tank. This method uses large-area uniform heat transfer to avoid local overheating and provides a stable thermal basis for melt polymerization. The motor drives the drive shaft 3 to rotate at low speed, which, together with the connecting frame 31, initially stirs the material and promotes the transfer of heat to the center. The heating chamber is equipped with multiple temperature sensors to adjust the medium flow rate and temperature in real time to prevent the material surface from turning yellow due to excessive heating. Step 2: The adjustable temperature sensing mechanism provides feedback on the internal temperature difference. The mixing rack 4 has a telescopic shaft 41 inserted inside, with a push rod motor connected to its top and a ring-shaped fixed frame 44 installed at its bottom. The fixed frame 44 has a temperature sensing mechanism on its edge. During the reaction, the push rod motor drives the telescopic shaft 41 to move up and down, so that the temperature sensing mechanism is immersed in different depths of the material in sequence. The collected temperature data is uploaded to the control system in real time. The system judges the temperature difference in the vertical direction based on this. If the temperature of a certain layer deviates significantly from the set value, the controller automatically adjusts the speed of the drive shaft 3 or adjusts the installation angle of the mixing ring 36 to enhance the local mixing intensity and quickly smooth out the temperature difference. Step 3: Linkage Control of Near-Wall Temperature Monitoring and Stirring Efficiency Several temperature sensing modules 57 are installed at the front end of the scraper frame 52. These modules are close to the inner wall of the tank 2 and monitor the temperature at the interface between the wall and the material in real time. When the sensing module 57 detects an abnormal increase in wall temperature, exceeding the upper limit allowed by the process, the control system immediately reduces the temperature of the medium in the heating chamber and changes the angle of the connecting plate 341 on the drive shaft 3, so that the stirring ring 36 increases the axial flow component and quickly carries the heat from the wall into the central material. Conversely, if the wall temperature is lower than the target value, the medium temperature is increased and the stirring is adjusted to a stronger turbulent flow mode to enhance the heat exchange efficiency and ensure that there is no high-temperature stagnation zone on the inner wall of the tank throughout the reaction process, reducing the risk of material sticking to the wall and drying out. Step 4: Adjustable angle stirring ring eliminates localized heat accumulation A transmission rod 32 is inserted inside the drive shaft 3, and a transmission tooth is provided in the snap-fit ​​groove 33, which meshes with the transmission tooth ring at the bottom of the rotating shaft 34 in the sealing block 35. By moving the transmission rod 32 axially through an external actuator, the meshing position can be changed, thereby driving the rotating shaft 34 to perform circumferential motion, which in turn drives the connecting plate 341 and the stirring ring 36 to change their installation angle. Step 5: The reciprocating motion of the separation plate accelerates melting and homogenization. A rotating frame 42 is movably mounted on the outside of the telescopic shaft 41 below the stirring frame 4. The rotating frame 42 consists of a fixed ring and several arc-shaped stirring blades. An elliptical transmission disk 43 is installed at its bottom and is eccentrically positioned with respect to the telescopic shaft 41. Several straight grooves are opened on the edge of the fixed frame 44, and a vertically movable separation plate 45 is built inside. The top of the separation plate 45 is connected to the elliptical guide groove at the bottom of the transmission disk 43 via a push rod. When the rotating frame 42 rotates with the drive shaft 3, the transmission disk 43 pushes the push rod to reciprocate along the straight grooves, causing the separation plate 45 to periodically squeeze and shear the powdered raw materials that have become lumps or agglomerates in the material. This mechanical action quickly breaks up the agglomerates, increases the contact surface area between the raw materials and the heat medium, and accelerates melting and heat transfer.

[0036] In the description of this invention, it should be noted that the terms "upper," "lower," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0037] The present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the present invention and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A melt polymerization reactor for high-temperature resistant and yellowing-resistant polyester resin, characterized in that, Including the support base; The rear end of the support base is provided with a conveying rail, the tank is provided between the support bases, the top of the tank is provided with a movable cover, the inside of the conveying rail is provided with a transmission frame, and the outside of the transmission frame is provided with a fixed fork that connects to the movable cover. The movable cover is provided with a welding seat on top, a control motor is provided on the welding seat, and a drive shaft is provided at the bottom of the control motor. A set of push rod motors is provided on top of the welding seat, and a stirring frame is provided at the bottom of the push rod motors. A connecting frame for stirring and mixing is provided outside the drive shaft. A transmission beam is provided at the bottom of the drive shaft, and scraper frames are provided at both ends of the transmission beam.

2. The melt polymerization equipment for high-temperature resistant and anti-yellowing polyester resin according to claim 1, characterized in that, The tank body is provided with snap-fit ​​brackets at both ends, and the snap-fit ​​brackets are located at the top of the support base for supporting the tank body. The bottom of the tank body is provided with a discharge pipe, the top of the movable cover is provided with several feed pipes, and the outside of the tank body is provided with an annular heating chamber.

3. The melt polymerization equipment for high-temperature resistant and anti-yellowing polyester resin according to claim 1, characterized in that, The drive shaft is internally fitted with a transmission rod, and the transmission rod is provided with several snap-fit ​​grooves at the positions corresponding to the connecting frame. The snap-fit ​​grooves are internally connected with transmission teeth, and the connecting frame is externally connected with several sealing blocks, the positions of which correspond to the snap-fit ​​grooves. A rotating shaft is inserted inside the sealing block. A transmission gear ring is provided at the bottom of the rotating shaft, and the transmission gear ring abuts against the inside of the snap-fit ​​groove. The rotating shaft rotates as it is engaged with the transmission gear ring and the transmission gear plate, and is used to adjust the stirring angle.

4. The melt polymerization equipment for high-temperature resistant and anti-yellowing polyester resin according to claim 1, characterized in that, A connecting plate is provided on the outside of the rotating shaft, and a stirring ring is installed on one side of the connecting plate. The installation angle of the stirring ring is adjustable, and the stirring ring is eccentrically positioned with respect to the inner hole.

5. The melt polymerization equipment for high-temperature resistant and anti-yellowing polyester resin according to claim 1, characterized in that, The stirring rack is equipped with a telescopic shaft that is movably inserted inside. The telescopic shaft is installed at the bottom of the output end of the push rod motor. A fixed frame is connected to the bottom of the telescopic shaft. The fixed frame is annular and has several transmission grooves on its edges. Several separation plates are movably arranged inside the transmission grooves. A temperature sensing mechanism is provided at the bottom of the fixed frame to provide feedback on the internal melting temperature.

6. The melt polymerization apparatus for high-temperature resistant and anti-yellowing polyester resin according to claim 5, characterized in that, A rotating frame is movably mounted on the outside of the telescopic shaft. The rotating frame consists of a set of fixed rings and several arc-shaped stirring blades. An elliptical transmission disk is installed at the bottom of the rotating frame. The transmission disk is eccentrically positioned with respect to the telescopic shaft and rotates with the rotating frame. A push rod is provided at the top of the separation plate, penetrating the fixed frame. A straight groove for the movement of the push rod is provided on the fixed frame. An elliptical guide rail groove is opened at the bottom of the transmission disk, and the top end of the push rod is located inside the guide rail groove.

7. The melt polymerization equipment for high-temperature resistant and anti-yellowing polyester resin according to claim 1, characterized in that, The bottom of the transmission beam is provided with a set of movable cavities, and a pusher plate is movably arranged inside the movable cavities. The scraper frame is installed at the bottom of the pusher plate, and a hollow box is installed on the side of the scraper frame near the drive shaft. A rectangular groove is opened on the scraper frame. An air inlet is provided at the bottom of the hollow box, and a sealing gasket is provided inside the air inlet. A conveying channel is provided inside the hollow box, and several piston push rods are symmetrically arranged on the output port of the conveying channel. A reset end block is connected to the outside of the piston push rod. The reset end block is locked inside the rectangular groove. Several connecting pipes are provided outside the hollow box, and the reset end block is sleeved on the outside of the connecting pipes.

8. The melt polymerization equipment for high-temperature resistant and anti-yellowing polyester resin according to claim 1, characterized in that, The scraper frame is equipped with a cleaning plate on its exterior. One end of the cleaning plate is connected to several elastic reset pins, which are installed inside the connecting pipe. Several temperature sensing modules are provided at the front end of the cleaning plate.

9. The melt polymerization equipment for high-temperature resistant and anti-yellowing polyester resin according to claim 8, characterized in that, The front end of the cleaning plate is provided with a set of symmetrically arranged docking grooves, and several elastic scrapers are locked inside the docking grooves. The elastic scrapers are evenly distributed at both ends of the cleaning plate. Several positioning pins are provided on the elastic scrapers, and connecting protrusions are conveniently provided on the elastic scrapers.

10. A temperature control method for the melt polymerization reaction equipment of the high-temperature resistant and anti-yellowing polyester resin according to any one of claims 1-9, comprising: Step 1: External heat exchange medium is circulated and heated. The heating medium is filled into the annular heating chamber outside the tank and heat exchange occurs, gradually increasing the overall temperature inside the reactor to provide a basic heat source for melt polymerization while avoiding local overheating. Step 2: A height-adjustable temperature sensing mechanism provides feedback on the internal temperature difference. The stirring rack has a telescopic shaft inside, with a temperature sensing mechanism installed at the bottom. A push rod motor drives it to extend into materials at different depths, collecting real-time melting temperature data for each layer and feeding it back to the control system. This data is used to dynamically adjust the drive shaft speed, reducing the internal temperature difference within the material. Step 3: Near-wall temperature monitoring and stirring efficiency linkage control. Multiple temperature sensing modules are installed at the front end of the scraper frame to monitor the temperature of the area near the inner wall of the reactor in real time. This data, in conjunction with the internal temperature sensing mechanism, generates an overall heating curve, which is then used to adjust the stirring ring angle, connecting plate position, and rotation speed to optimize heat transfer uniformity. Step 4: The adjustable angle stirring ring eliminates local heat accumulation. By controlling the position of the transmission rod, the transmission gear ring at the bottom of the rotating shaft is driven to engage with the snap-fit ​​groove, changing the installation angle and eccentricity of the connecting plate and the stirring ring. Adjust the stirring direction and intensity based on real-time temperature feedback to prevent excessive local temperature differences in gel-like materials due to uneven stirring, thereby reducing the risk of yellowing. Step 5: The reciprocating motion of the separating plate accelerates melting and temperature uniformity. The rotating frame drives the eccentrically positioned transmission disc to rotate, pushing the separating plate on the fixed frame to reciprocate along the straight groove. This action compresses and disperses the powdered raw material, breaks up agglomerates, accelerates the melting speed, and promotes rapid heat transfer in the material, maintaining a uniform overall temperature.

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