Continuous production system for biodegradable polyesters

Abstract

The present application relates to the technical field of polyester equipment, and particularly relates to a biodegradable polyester continuous production system, which comprises an equipment chassis, the upper end face of the equipment chassis is provided with a transverse movable frame, the transverse movable frame is in sliding connection with the equipment chassis, an esterification reactor is vertically installed in the equipment chassis, the esterification reactor is in sliding connection with the equipment chassis, and the two ends of the equipment chassis are provided with positioning screw holes for fixing the esterification reactor, and a mixing tank group is fixedly installed on the upper end face of the transverse movable frame. The biodegradable polyester continuous production system adopts a modular slidable layout, integrates a feeding and mixing unit on a slidable transverse movable frame, and the esterification reactor can also be slidably installed, so that the difficulty of system maintenance and production change adjustment is greatly reduced, the large hoisting equipment is not needed for completing displacement and disassembly, the maintenance time is effectively reduced, the production efficiency is greatly improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of polyester equipment technology, and in particular to a continuous production system for biodegradable polyester. Background Technology

[0002] Biodegradable polyester is a core material currently replacing traditional petroleum-based non-degradable plastics, and is widely used in food packaging, disposable tableware, and express delivery bags, with market demand increasing year by year. The industrial production of biodegradable polyester mainly uses terephthalic acid (PTA), ethylene glycol (EG), and butanediol as raw materials, and obtains the finished product through processes such as esterification, pre-condensation, and final condensation. To improve production efficiency and product quality stability, continuous production has become the mainstream process direction for the current production of biodegradable polyester.

[0003] In existing continuous production systems for biodegradable polyester, the feeding and mixing unit and the esterification reaction unit are mostly fixed in place. That is, the mixing tank and storage tank are fixed on the foundation of the plant area, and the esterification reactor is also fixed to the ground with anchor bolts. When it is necessary to maintain or replace the mixing components, clean the scale on the esterification reactor, or adjust the relative position of the equipment for production change, large hoisting equipment is required for disassembly and assembly. The whole process takes 1 to 2 days, which seriously encroaches on production time, reduces the efficiency of continuous production, and increases maintenance costs.

[0004] In the mixing stage, most existing mixing equipment for biodegradable polyester production adopts a central single-shaft stirring structure, relying solely on a central stirring shaft to drive the impeller for stirring. Since the raw materials for biodegradable polyester are solid PTA and liquid EG, the density difference between the two materials is large, making stratification easy. The central stirring has a large number of stirring blind zones, which not only easily causes solid PTA to deposit at the bottom of the tank, but also leads to poor uniformity of raw material mixing. In the subsequent esterification reaction, some raw materials do not react fully, resulting in an excessively wide molecular weight distribution of the final polyester product, which seriously affects the mechanical properties and degradation performance of biodegradable polyester.

[0005] Furthermore, PTA, as the main raw material, is highly hygroscopic and easily absorbs moisture from the air, causing it to clump. Most PTA storage silos in existing continuous production systems are open or simply sealed structures without supporting in-situ drying and dehumidification structures. During storage, PTA easily absorbs moisture. On the one hand, clumps of PTA can cause blockages at the discharge port, resulting in interruptions in the supply and affecting the stability of continuous production. On the other hand, the absorbed moisture, once it enters the reaction system, will disrupt the equilibrium of the esterification reaction, inhibit the forward esterification reaction, reduce the conversion rate of the esterification reaction, and further affect production efficiency and product quality. Summary of the Invention

[0006] This invention solves the problems in related technologies and proposes a continuous production system for biodegradable polyester, which overcomes the shortcomings of existing continuous production systems for biodegradable polyester, such as inconvenient equipment maintenance, poor mixing uniformity, and raw materials being prone to moisture absorption, which affects production.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: a biodegradable polyester continuous production system, including an equipment base frame, a transverse movable frame installed on the upper surface of the equipment base frame, the transverse movable frame being slidably connected to the equipment base frame, an esterification reactor vertically installed in the equipment base frame, the esterification reactor being slidably connected to the equipment base frame, and positioning screw holes for fixing the esterification reactor provided at both ends of the equipment base frame, a mixing tank group fixedly installed on the upper surface of the transverse movable frame, and a first storage component and a second storage component for feeding the mixing tank group are also provided on the transverse movable frame, and a feeding component for conveying the material of the second storage component to the mixing tank group is also provided at the lower end of the transverse movable frame.

[0008] By adopting the above technical solution, the mixing and feeding unit is integrated on a sliding horizontal frame through a modular layout, and the esterification reactor is slidably installed on the equipment base frame. This not only realizes the integration of each unit in the continuous production of biodegradable polyester, which facilitates production control, but also allows for flexible adjustment of the relative positions of each unit according to the needs of production and maintenance. There is no need for overall hoisting and disassembly, which greatly reduces the difficulty of maintenance operations. The first and second storage components store two different raw materials respectively, and the feeding components provide precise feeding to meet the needs of continuous and stable feeding during continuous production, thus ensuring production continuity.

[0009] As a preferred embodiment, the equipment base frame includes a base frame and a top frame for sliding installation of the horizontal movable frame. The top frame is arranged parallel above the base frame. The top frame includes a middle plate, a horizontal guide rail, and a vertical baffle. The horizontal guide rail is fixed parallel to both ends of the middle plate, and the vertical baffle is fixed vertically to one end of the horizontal guide rail. The base frame is also provided with vertical support rods and diagonal support rods to support the horizontal guide rail, and stable base plates are fixed at the four corners of the lower end face of the base frame.

[0010] By adopting the above technical solution, the layered design of the bottom frame and top frame corresponds to the sliding installation of the esterification reactor and the horizontal movable frame, respectively. The layered layout makes full use of vertical space and reduces the footprint of the entire system. The horizontal guide rails and vertical baffles can provide stable guidance and limit for the sliding of the horizontal movable frame, preventing it from deviating or tipping over during the sliding process. The vertical and diagonal supports work together to support the top frame, forming a stable triangular support structure, which improves the load-bearing capacity of the top frame and prevents deformation after long-term support of the mixing and storage components. The stable bottom plate increases the contact area between the bottom frame and the ground, improves the stability of the entire system, and reduces vibration during the production process.

[0011] As a preferred embodiment, the transverse movable frame includes a bent support frame and an outer support plate for installing the mixing tank assembly. The bent support frame is slidably mounted on the upper surface of the horizontal guide rail, and a limiting side plate is provided at one end of the bent support frame. The limiting side plate is fixedly connected to the bent support frame, and an electromagnet that can be attracted to the middle plate and the vertical baffle is embedded and fixed in the limiting side plate. The electromagnet passes through both ends of the limiting side plate. The outer support plate is located at the head of the other end of the bent support frame, and the outer support plate is fixedly connected to the bent support frame.

[0012] By adopting the above technical solution, the bent support frame and the horizontal guide rail can achieve sliding installation. The outer support plate provides a stable installation base for all material storage and mixing components. The limiting side plate and the electromagnet can quickly lock and fix the middle plate and the vertical baffle after the horizontal movable frame moves into place by energizing the electromagnet. No additional bolts are required for positioning. The locking operation is convenient, quick and reliable.

[0013] As a preferred embodiment, the esterification reactor includes a reactor body, a reaction stirrer, and a feed pipe. The reactor body has bent seats at both ends that cooperate with the bottom frame. The bent seats are fixedly connected to the reactor body, and auxiliary wheels are rotatably installed in the bent seats. The auxiliary wheels are supported on the upper end face of the bottom frame. The outer end of the bent seats has a connecting through hole corresponding to the positioning screw hole. The reaction stirrer is vertically fixed at the center of the upper end face of the reactor body, and the feed pipe is inclinedly fixed on the upper end face of the reactor body.

[0014] By adopting the above technical solution, the main body of the reactor can slide and move on the equipment base frame through the bent seats at both ends and the auxiliary wheels. During the movement, the auxiliary wheels reduce the movement resistance, and a single person can push the esterification reactor to complete the relocation. With the help of positioning screw holes and connecting through holes, bolts can be inserted to fix it after the relocation is in place. Disassembly and relocation are very convenient, which facilitates the cleaning and maintenance of the reactor interior. The reaction stirrer extends into the reactor body from the top, and the stirring path covers the entire interior of the reactor body, ensuring that the materials are mixed evenly during the esterification reaction.

[0015] As a preferred embodiment, the mixing tank assembly includes a bottom tank shell, a top tank shell, and several mixing mechanisms. The top tank shell is sleeved and installed on the bottom tank shell, and the top tank shell and the bottom tank shell are sealed and fixedly connected. An oil seal is fixed at the center of the upper end face of the top tank shell. Gear boxes are integrally formed on both sides of the lower end of the oil seal. The mixing mechanisms are evenly installed in the top tank shell along the circumferential direction, and the mixing mechanisms are rotatably connected to the top tank shell. A drive component for driving all mixing mechanisms to rotate is fixedly installed on the upper end face of the oil seal.

[0016] By adopting the above technical solutions, the mixing tank is designed with a separate bottom and top shell, which facilitates the assembly and maintenance of the internal mixing mechanism during installation. The sealed connection ensures stable pressure inside the tank during mixing and prevents raw material leakage. Multiple mixing mechanisms are arranged around the circumference, which can simultaneously stir materials in different areas of the tank, eliminate blind spots in the central stirring, and improve the uniformity of mixing. The gear box and oil seal provide sealed protection for the transmission structure, preventing materials from entering the transmission structure and causing gear wear, thus extending the service life of the transmission structure. A single drive component can drive all mixing mechanisms to rotate synchronously.

[0017] As a preferred embodiment, the bottom tank shell includes an outer base and an inner arc-shaped shell. The inner arc-shaped shell is fixedly installed on the upper end face of the outer base, and an external drain pipe is set at the center of the lower end face of the outer base. The upper end face of the top tank shell is fixed with a feed hopper and a liquid inlet pipe. The driving component includes a top motor and a driving inner rod. The top motor is fixedly installed on the upper end face of the oil seal shell, and the driving inner rod is rotatably installed in the oil seal shell. The head of the driving inner rod is fixed to the output shaft of the top motor, and a driving gear is sleeved and fixed on the driving inner rod.

[0018] By adopting the above technical solution, the inner arc shell design allows all the material after mixing to be discharged from the central outer discharge pipe, avoiding material accumulation at the bottom of the tank and reducing raw material waste. The feed hopper and liquid inlet pipe correspond to the feeding of solid and liquid raw materials respectively, with clear division of labor and no interference between feeding. The top motor adopts a standardized vertical geared motor with stable driving force. The oil seal shell seals and protects the drive inner rod and drive gear, preventing raw material vapor from corroding the transmission components. The drive gear synchronously drives all driven gears, with good transmission synchronization.

[0019] As a preferred embodiment, the mixing mechanism includes a long shaft, a top mixing impeller, a middle mixing impeller, and a bottom mixing impeller. The long shaft is rotatably mounted in the top tank shell, with its head extending into the oil seal shell. A driven gear meshing with a drive gear is fitted and fixed to the head of the long shaft. The top mixing impeller is positioned above the bottom mixing impeller, and both the top and bottom mixing impellers are fitted and fixed to the lower end of the long shaft. Several sets of synchronous connecting rods are also provided between the top and bottom mixing impellers. The middle mixing impeller is positioned between the top and bottom mixing impellers, and buffer springs connected to the top and bottom mixing impellers are provided at both ends of the middle mixing impeller. The middle mixing impeller is fitted and mounted on the long shaft, and is slidably connected to the long shaft.

[0020] By adopting the above technical solution, the long shaft drives the multi-stage impeller to rotate. The top impeller, middle impeller, and bottom impeller simultaneously stir the materials in the upper, middle, and lower layers of the tank, respectively, achieving blind-spot-free stirring across the entire tank height range and preventing material stratification. The meshing transmission of the drive gear and driven gear results in high transmission efficiency and low noise. The synchronous connecting rod connects the top impeller and the bottom impeller, improving the overall stability of the impeller structure and preventing deformation and detachment of the impeller under heavy load stirring. The middle impeller is slidably mounted on the long shaft and, with the help of upper and lower buffer springs, can float up and down along the long shaft during rotation, disturbing material layers of different densities and further improving the uniformity of mixing.

[0021] As a preferred embodiment, the first storage assembly includes an EG storage tank and a metering pump. The EG storage tank is fixedly mounted on an outer support plate, and the metering pump is fixedly mounted on the upper end face of the EG storage tank. The outlet of the metering pump is provided with a supply pipe connected to the inlet pipe.

[0022] By adopting the above technical solution, the first storage component is dedicated to storing liquid raw material EG. The metering pump can accurately control the amount of EG supplied, ensuring high feeding accuracy and guaranteeing that the raw material ratio meets the production process requirements. This avoids the impact of ratio errors on product quality. The liquid supply pipe is directly connected to the liquid inlet pipe, ensuring continuous and stable feeding and meeting the continuous feeding needs of continuous production.

[0023] As a preferred embodiment, the second storage assembly includes a PTA storage silo, a sealing cover, and a drying assembly. The PTA storage silo is vertically fixed on an outer support plate, and a discharge pipe is provided on the lower end face of the PTA storage silo. A control valve is installed in the discharge pipe. The sealing cover is sealed and fixed on the upper end face of the PTA storage silo, and the drying assembly is fixedly installed on the inner side of the top surface of the sealing cover.

[0024] By adopting the above technical solution, the second storage component is specially used to store solid raw material PTA. The silo cover seals the storage silo to prevent external moisture from entering. The drying component continuously dries the PTA in the storage silo in situ to prevent PTA from absorbing moisture and clumping, ensuring smooth material discharge. The control valve precisely controls the discharge amount of PTA to ensure the accuracy of the proportioning.

[0025] As a preferred embodiment, the feeding assembly includes a feeding tank, a rotary feeding component, a feeding pipe assembly, and a gas compressor. The feeding tank includes an annular shell, an arc-shaped cover plate, and a conical shell. The arc-shaped cover plate and the conical shell are respectively fixed to the upper and lower ends of the annular shell. A guide pipe connected to the discharge pipe is vertically fixed at the center of the upper surface of the arc-shaped cover plate. An auxiliary bearing is sleeved on the outer side of the lower end of the guide pipe. A lower discharge pipe is sealed and fixed at the lower end of the conical shell. The rotary feeding component includes an annular seat, pneumatic blades, a V-shaped frame, and a conveying rod. The annular seat is connected to the guide pipe via the auxiliary bearing. The vertical pipe is rotatably connected, and the pneumatic blades are evenly fixed on the outer surface of the annular seat along the circumferential direction. The V-shaped frame is fixedly installed on the lower end face of the annular seat. The conveying rod is coaxially arranged with the annular seat. The head of the conveying rod is fixedly connected to the V-shaped frame, and the lower end of the conveying rod extends into the lower pipe. Spiral discharge blades are also fixed on the outer surface of the conveying rod. The gas compressor is fixed on the outer support plate, and the gas compressor outlet pipe is sealed and connected to the arc-shaped cover plate of the sending tank. One end of the feeding pipe assembly is sealed and connected to the lower pipe, and the other end of the feeding pipe assembly is connected to the feeding hopper.

[0026] By adopting the above technical solution and using an integrated structure of pneumatically driven rotary feeders, there is no need to arrange an additional drive motor inside the feeding tank. This simplifies the equipment structure, reduces space occupation, and makes it easier to achieve a full seal on the feeding tank. This effectively isolates external moisture, preventing biodegradable polyester raw materials / prepolymer products from absorbing moisture, oxidizing, and deteriorating, thus ensuring product quality stability. It combines the advantages of pneumatic conveying and mechanical screw feeding: compressed air serves as both the power source and the conveying medium for the rotary feeders. Combined with the mechanical pushing of the screw discharge blades, it solves the problems of uneven feeding and easy material breakage in pure pneumatic conveying, and the problems of easy clogging and poor sealing in pure mechanical feeding. This meets the needs of long-cycle continuous production of biodegradable polyester. The feeding tank adopts a combination structure of arc-shaped cover plate + ring shell + conical shell, eliminating airflow dead zones inside the tank. Raw materials are less likely to accumulate on the tank walls, reducing material waste and preventing residual raw materials from degrading and deteriorating over time, thus contaminating subsequent batches and ensuring batch stability in production. The rotary feeder is coaxially mounted on the outside of the guide vertical pipe via an auxiliary bearing. It has a compact structure, high coaxiality, low vibration and wear during rotation, and can extend the service life of the equipment. The V-shaped frame connecting the conveyor rod has high structural support strength and can withstand the load of large-flow feeding, making it suitable for the needs of large-scale continuous production.

[0027] Compared with existing technologies, the beneficial effects of this invention are as follows: The biodegradable polyester continuous production system of this application adopts a modular sliding layout, integrating the feeding and mixing unit on a sliding horizontal movable frame. The esterification reactor can also be slidably installed, greatly reducing the difficulty of system maintenance and production changeover adjustments. Relocation and disassembly can be completed without large hoisting equipment, effectively reducing maintenance time, significantly improving production efficiency, and reducing maintenance costs. The mixing tank group of this invention adopts multiple sets of multi-stage floating mixing mechanisms distributed along the circumference. Compared with traditional central single-axis stirring, it eliminates the stirring blind zone, solves the problems of uneven mixing of solid-phase PTA and liquid-phase EG, and solid-phase deposition, significantly improving the mixing uniformity. This provides qualified raw materials for subsequent esterification reactions, ensuring the esterification reaction proceeds fully, effectively improving the quality stability of biodegradable polyester products, and reducing molecular weight distribution deviation. Addressing the hygroscopic nature of PTA, the equipment incorporates an in-situ drying component within the PTA storage silo. This continuously controls the moisture content of the PTA, preventing issues such as clumping and poor material flow, and excessive water content in the reaction system. This ensures a positive shift in the esterification reaction equilibrium, improving conversion rates and ultimately enhancing production efficiency and product quality. The equipment boasts high integration, a compact layout, and a small footprint. Modular design of components facilitates easy replacement in case of malfunctions. It is adaptable to the continuous production needs of biodegradable polyester at varying capacities, making it widely applicable. Attached Figure Description

[0028] Figure 1 This is a perspective view of the overall structure in an embodiment of the present invention; Figure 2 yes Figure 1 Side view of the device shown; Figure 3 yes Figure 1 A front view of the device shown; Figure 4 This is a perspective view of the equipment base and esterification reactor in an embodiment of the present invention. Figure 5 yes Figure 4 A front view of the device shown; Figure 6 This is a perspective view of the feeding component in an embodiment of the present invention; Figure 7 yes Figure 6 A front view of the device shown; Figure 8 yes Figure 6 A cross-sectional view of the device shown; Figure 9 This is a perspective view of the rotating feeder in an embodiment of the present invention; Figure 10 yes Figure 9 A front view of the device shown; Figure 11This is a three-dimensional mixing tank assembly in an embodiment of the present invention. Figure 1 ; Figure 12 This is a three-dimensional mixing tank assembly in an embodiment of the present invention. Figure 2 ; Figure 13 yes Figure 11 A front view of the device shown; Figure 14 yes Figure 11 A perspective view of the device shown without the bottom tank shell installed; Figure 15 yes Figure 14 A front view of the device shown; Figure 16 This is a perspective view of the mixing mechanism in this embodiment of the invention without the long shaft installed; Figure 17 yes Figure 16 Front view of the device shown.

[0029] In the diagram: 1. Equipment base frame; 10. Positioning screw holes; 11. Base frame; 111. Vertical support rod; 112. Diagonal support rod; 113. Stabilizing base plate; 12. Top frame; 121. Middle plate; 122. Horizontal guide rail; 123. Vertical baffle; 2. Horizontal movable frame; 21. Bending support frame; 211. Limiting side plate; 22. Outer support plate; 23. Electromagnet; 3. Esterification reactor; 31. Reactor body; 311 312. Bending seat; 313. Auxiliary wheel; 314. Connecting through hole; 32. Reactor stirrer; 33. Feed pipe; 4. Mixing tank assembly; 41. Bottom tank shell; 415. Outer base; 416. Inner arc surface shell; 417. Outer drain pipe; 42. Top tank shell; 428. Oil seal shell; 429. Gear box; 420. Feed hopper; 421. Liquid inlet pipe; 432. Mixing mechanism; 433. Long shaft; 434. Mixing top impeller; 433. Mixing impeller; 434. Mixing bottom impeller; 435. Driven gear; 436. Buffer spring; 437. Synchronous connecting rod; 44. Drive component; 441. Top motor; 442. Drive inner rod; 443. Drive gear; 5. First storage assembly; 51. EG storage tank; 52. Metering pump; 521. Liquid supply pipe; 6. Second storage assembly; 61. PTA storage silo; 611. Discharge pipe; 62. Sealing cover; 7. Feeding assembly; 71. Feeding tank; 711. Ring shell; 712. Arc-shaped cover plate; 713. Conical shell; 714. Guide vertical pipe; 715. Auxiliary bearing; 716. Lower discharge pipe; 72. Rotary feeder; 721. Annular seat; 722. Pneumatic blade; 723. V-shaped frame; 724. Conveying rod; 725. Spiral discharge blade; 73. Feeding pipe assembly; 74. Gas compressor. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0033] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0034] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figure to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figure. For example, if the device in the figure is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0036] Example 1 Reference Figure 1 , Figure 2 ,picture, Figure 4 and Figure 5A biodegradable polyester continuous production system includes a base frame 1, a transverse movable frame 2 installed on the upper surface of the base frame 1, the transverse movable frame 2 being slidably connected to the base frame 1, an esterification reactor 3 vertically installed in the base frame 1, the esterification reactor 3 being slidably connected to the base frame 1, and positioning screw holes 10 for fixing the esterification reactor 3 provided at both ends of the base frame 1, a mixing tank group 4 fixedly installed on the upper surface of the transverse movable frame 2, and a first storage component 5 and a second storage component 6 for feeding the mixing tank group 4 are also provided on the transverse movable frame 2, and a feeding component 7 for conveying the material of the second storage component 6 to the mixing tank group 4 is also provided at the lower end of the transverse movable frame 2. By integrating the mixing and feeding unit onto the sliding horizontal movable frame 2 through a modular layout, the esterification reactor 3 can be slidably installed on the equipment base frame 1. This not only realizes the integration of each unit in the continuous production of biodegradable polyester, which facilitates production control, but also allows for flexible adjustment of the relative positions of each unit according to the needs of production and maintenance. There is no need for overall hoisting and disassembly, which greatly reduces the difficulty of maintenance operations. The first storage component 5 and the second storage component 6 store two different raw materials respectively, and the feeding component 7 provides precise feeding to meet the needs of continuous and stable feeding in the continuous production process, ensuring production continuity. The equipment base frame 1 includes a base frame 11 and a top frame 12 for sliding installation of the transverse movable frame 2. The top frame 12 is arranged parallel above the base frame 11. The top frame 12 includes a middle plate 121, a horizontal guide rail 122 and a vertical baffle 123. The horizontal guide rail 122 is fixed parallel to both ends of the middle plate 121, and the vertical baffle 123 is fixed vertically to one end of the horizontal guide rail 122. The base frame 11 is also provided with a vertical support rod 111 and an inclined support rod 112 to support the horizontal guide rail 122. The four corners of the lower end face of the base frame 11 are fixed with a stable base plate 113. The layered design of the bottom frame 11 and top frame 12 corresponds to the sliding installation of the esterification reactor 3 and the transverse movable frame 2, respectively. The layered layout makes full use of the vertical space and reduces the footprint of the entire system. The horizontal guide rail 122, together with the vertical baffle 123, can provide stable guidance and limit for the sliding of the transverse movable frame 2, preventing the transverse movable frame 2 from deviating and tipping over during the sliding process. The vertical support rod 111 and the diagonal support rod 112 work together to support the top frame 12, forming a stable triangular support structure, which improves the load-bearing capacity of the top frame 12 and prevents deformation after long-term bearing of the mixing and storage components. The stable bottom plate 113 increases the contact area between the bottom frame 11 and the ground, improves the stability of the entire system placement, and reduces vibration during the production process.

[0037] Reference Figure 1 , Figure 2 and Figure 3The transverse movable frame 2 includes a bent support frame 21 and an outer support plate 22 for the mixing tank assembly 4. The bent support frame 21 is slidably installed on the upper end face of the horizontal guide rail 122, and a limiting side plate 211 is provided at one end of the bent support frame 21. The limiting side plate 211 is fixedly connected to the bent support frame 21, and an electromagnet 23 that can be attracted to the middle plate 121 and the vertical baffle 123 is embedded and fixed in the limiting side plate 211. The electromagnet 23 passes through both ends of the limiting side plate 211. The outer support plate 22 is provided at the head of the other end of the bent support frame 21, and the outer support plate 22 is fixedly connected to the bent support frame 21. The bent support frame 21, in conjunction with the horizontal guide rail 122, enables sliding installation. The outer support plate 22 provides a stable installation base for all material storage and mixing components. The limiting side plate 211, in conjunction with the electromagnet 23, allows for quick locking and fixation after the transverse movable frame 2 has moved into place. This is achieved by energizing the electromagnet 23 to attract the middle plate 121 and the vertical baffle 123, eliminating the need for additional bolts for positioning. The locking operation is convenient, quick, and reliable, and can adapt to frequent position adjustment requirements. The lock can be released and the frame can be moved again after power is cut off, greatly improving flexibility.

[0038] Reference Figure 4 and Figure 5 The esterification reactor 3 includes a reactor body 31, a stirrer 32, and a feed pipe 33. Both ends of the reactor body 31 are provided with bending seats 311 that cooperate with the bottom frame 11. The bending seats 311 are fixedly connected to the reactor body 31, and auxiliary wheels 312 are rotatably installed in the bending seats 311. The auxiliary wheels 312 are supported on the upper end face of the bottom frame 11. The outer end of the bending seats 311 is provided with a connecting through hole 313 corresponding to the positioning screw hole 10. The stirrer 32 is vertically fixed at the center of the upper end face of the reactor body 31, and the feed pipe 33 is inclinedly fixed on the upper end face of the reactor body 31. The reactor body 31 slides on the equipment base frame 1 via the bent seats 311 at both ends and the auxiliary wheels 312. During the movement, the auxiliary wheels 312 reduce the movement resistance, allowing a single person to push the esterification reactor 3 to complete the relocation. With the help of the positioning screw holes 10 and the connecting through holes 313, the reactor can be fixed by inserting bolts after it is moved into place. Disassembly and relocation are very convenient, facilitating the cleaning and maintenance of the reactor interior. The reaction stirrer 32 extends into the reactor body from the top, and the stirring path covers the entire interior of the reactor body, ensuring that the materials are mixed evenly during the esterification reaction. The inclined setting of the feed pipe 33 can prevent material splashing during the feeding process and ensure smooth feeding.

[0039] Reference Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 and Figure 17The mixing tank group 4 includes a bottom tank shell 41, a top tank shell 42, and several mixing mechanisms 43. The top tank shell 42 is sleeved and installed on the bottom tank shell 41, and the top tank shell 42 and the bottom tank shell 41 are sealed and fixedly connected. An oil seal shell 421 is fixed at the center of the upper end face of the top tank shell 42. Gear boxes 422 are integrally formed on both sides of the lower end of the oil seal shell 421. The mixing mechanisms 43 are evenly installed in the top tank shell 42 along the circumferential direction, and the mixing mechanisms 43 are rotatably connected to the top tank shell 42. A drive component 44 for driving all mixing mechanisms 43 to rotate is fixedly installed on the upper end face of the oil seal shell 421. The mixing tank assembly features a split bottom tank shell 41 and top tank shell 42 design, facilitating the assembly and maintenance of the internal mixing mechanism 43 during installation. The sealed connection ensures stable pressure inside the tank during mixing, preventing raw material leakage. Multiple mixing mechanisms 43 are arranged circumferentially, enabling simultaneous stirring of materials in different areas of the tank, eliminating blind spots in central stirring, and improving mixing uniformity. The gear box 422 and oil seal shell 421 provide sealed protection for the transmission structure, preventing materials from entering the transmission structure and causing gear wear, thus extending the service life of the transmission structure. A single drive component 44 can drive all mixing mechanisms 43 to rotate synchronously, reducing the configuration of power components and lowering system costs. The bottom tank shell 41 includes an outer base 411 and an inner arc surface shell 412. The inner arc surface shell 412 is fixedly installed on the upper end face of the outer base 411, and an external drain pipe 413 is set at the center of the lower end face of the outer base 411. The upper end face of the top tank shell 42 is fixed with a feed hopper 423 and a liquid inlet pipe 424. The driving component 44 includes a top motor 441 and a driving inner rod 442. The top motor 441 is fixedly installed on the upper end face of the oil seal shell 421. The driving inner rod 442 is rotatably installed in the oil seal shell 421, and the head of the driving inner rod 442 is fixed to the output shaft of the top motor 441. A driving gear 443 is sleeved and fixed on the driving inner rod 442. The inner arc shell 412 design allows all the mixed material to be discharged from the central outer discharge pipe 413, avoiding material accumulation at the bottom of the tank and reducing raw material waste. The feed hopper 423 and the liquid inlet pipe 424 correspond to the feeding of solid and liquid raw materials respectively, with clear division of labor and no interference between feeding. The top motor 441 adopts a standardized vertical geared motor with stable driving force. The oil seal shell 421 seals and protects the drive inner rod 442 and drive gear 443 to prevent raw material vapor from corroding the transmission components. The drive gear 443 synchronously drives all driven gears 435, with good transmission synchronization. All mixing mechanisms 43 rotate at the same speed, resulting in higher mixing uniformity.The mixing mechanism 43 includes a long shaft 431, a top mixing impeller 432, a middle mixing impeller 433, and a bottom mixing impeller 434. The long shaft 431 is rotatably mounted in the top tank shell 42, and its head extends into the oil seal shell 421. A driven gear 435 that meshes with the drive gear 443 is sleeved and fixed to the head of the long shaft 431. The top mixing impeller 432 is positioned above the bottom mixing impeller 434, and both the top mixing impeller 432 and the bottom mixing impeller 434 are sleeved and fixed to the long shaft. At the lower end of rod 431, several sets of synchronous connecting rods 437 are provided between the mixing top impeller 432 and the mixing bottom impeller 434. The mixing middle impeller 433 is located between the mixing top impeller 432 and the mixing bottom impeller 434. The upper and lower ends of the mixing middle impeller 433 are provided with buffer springs 436 that are respectively connected to the mixing top impeller 432 and the mixing bottom impeller 434. The mixing middle impeller 433 is sleeved and installed on the long shaft rod 431, and the mixing middle impeller 433 is slidably connected to the long shaft rod 431. The long shaft 431 drives the multi-stage impellers to rotate. The top mixing impeller 432, the middle mixing impeller 433, and the bottom mixing impeller 434 simultaneously stir the materials in the upper, middle, and lower layers of the tank, respectively, achieving blind-spot-free stirring across the entire tank height range and preventing material stratification. The meshing transmission of the drive gear 443 and the driven gear 435 results in high transmission efficiency and low noise. The synchronous connecting rod 437 connects the top mixing impeller 432 and the bottom mixing impeller 434, improving the overall stability of the impeller structure and preventing deformation and detachment of the impeller under heavy load stirring. The middle mixing impeller 433 is slidably mounted on the long shaft 431. With the help of the upper and lower buffer springs 436, the middle mixing impeller 433 can float up and down along the long shaft 431 during rotation, disturbing material layers of different densities, further improving the mixing uniformity, preventing solid raw materials from depositing at the bottom of the tank, and effectively improving the mixing effect of PTA and EG.

[0040] Reference Figure 1 , Figure 2 and Figure 3The first storage assembly 5 includes an EG storage tank 51 and a metering pump 52. The EG storage tank 51 is fixedly mounted on the outer support plate 22, and the metering pump 52 is fixedly mounted on the upper end face of the EG storage tank 51. The outlet of the metering pump 52 is provided with a supply pipe 521 connected to the inlet pipe 424. The first storage assembly 5 is specifically for storing liquid raw material EG. The metering pump 52 can accurately control the EG supply amount, with high supply accuracy, ensuring that the raw material ratio meets the production process requirements and avoiding the impact of ratio errors on product quality. The supply pipe 521 is directly connected to the inlet pipe 424, ensuring continuous and stable supply and meeting the continuous supply needs of continuous production. The second storage assembly 6 includes a PTA storage silo 61, a sealing cover 62, and a drying assembly. The PTA storage silo 61 is vertically fixed on the outer support plate 22, and a discharge pipe 611 is provided on the lower end face of the PTA storage silo 61. A control valve is installed in the discharge pipe 611. The sealing cover 62 is sealed and fixed on the upper end face of the PTA storage silo 61, and the drying assembly is fixedly installed on the inner side of the top surface of the sealing cover 62. The second storage assembly 6 is specifically for storing solid-phase raw material PTA. The sealing cover 62 seals the storage silo to prevent external moisture from entering. The drying assembly continuously dries the PTA in the storage silo in situ to prevent PTA from absorbing moisture and clumping, ensuring smooth discharge. The control valve precisely controls the discharge rate of PTA to ensure accurate proportioning.

[0041] The biodegradable polyester continuous production system in this embodiment includes a base frame, a horizontal movable frame, an esterification reactor, a mixing tank group, a first storage assembly, and a second storage assembly. The entire system uses a Siemens S7-200SMART series PLC as the main control unit to perform logic control on all electrical components, resulting in high control precision, stable operation, and suitability for continuous chemical production scenarios. The preferred electromagnet is the Shanghai An brand P100 / 50 / 38 model, with a rated voltage of 24V and an attraction force of not less than 5kN. When energized, it can stably attract and lock the middle plate and the vertical baffle; when de-energized, it can unlock and slide. The outer support plate is welded and fixed to the other end of the bent support frame, providing an installation foundation for the mixing and storage assemblies. The outer support plate is made of Q235 steel plate with a rust-proof surface treatment, ensuring a long service life. The reactor body is made of 316L stainless steel with a polished inner wall to resist organic acid corrosion during esterification and prevent scaling. Both ends are welded with fixed bending seats, and nylon auxiliary wheels are rotatably installed inside the bending seats. These wheels have a rated load capacity of 1 ton and low rolling resistance, allowing a single person to move the esterification reactor. A connecting through hole is provided at the outer end of the bending seat, corresponding to the positioning screw holes on the bottom frame; bolts are then inserted for fixation. The reaction agitator is a Changzhou Oude vertical stirring motor, model OML-5.5, with a rated power of 5.5kW, meeting the esterification stirring requirements. The feed pipe is welded obliquely to the upper part of the reactor body to prevent material splashing. The top motor of the drive unit is a Siemens 1LE0001 series vertical geared motor with a rated power of 2.2kW and an output speed of 200r / min. The drive rod is rotatably installed inside the oil seal housing, with its upper end connected to the top motor output shaft and its lower end fitted with a fixed drive gear, ensuring reliable transmission sealing and preventing material corrosion. The buffer spring is made of 304 stainless steel with a stiffness coefficient of 2N / mm. During rotation, the impeller can float up and down along the long shaft to disturb the material, preventing PTA deposition and resulting in higher mixing uniformity. The EG storage tank is a 304 stainless steel sealed tank, fixed on the outer support plate. The metering pump is a Milton Roy GB series mechanical diaphragm metering pump, model GB1000, with a metering accuracy better than ±1% and a rated flow rate of 3m³ / h. The outlet is connected to the inlet pipe of the mixing tank assembly through a supply pipe for precise material supply. The second storage assembly includes a PTA storage silo, a sealing cover, and a drying assembly. The PTA storage silo is a vertical silo made of 304 stainless steel, fixed to an outer support plate, with a discharge pipe welded to the lower end. A pneumatic ball valve is installed on the discharge pipe for control. The sealing cover is sealed and fixed to the upper end of the storage silo. The drying assembly uses an HR-PTC100 series ceramic PTC heater dryer with a rated power of 1.5kW. The temperature inside the storage silo is controlled by a PLC to maintain at 65-75℃, ensuring that the PTA moisture content is below 0.1% and preventing moisture absorption and clumping.

[0042] Example 2 Reference Figure 1 , Figure 2 and Figure 3A biodegradable polyester continuous production system includes a base frame 1, a transverse movable frame 2 installed on the upper surface of the base frame 1, the transverse movable frame 2 being slidably connected to the base frame 1, an esterification reactor 3 vertically installed in the base frame 1, the esterification reactor 3 being slidably connected to the base frame 1, and positioning screw holes 10 for fixing the esterification reactor 3 provided at both ends of the base frame 1, a mixing tank group 4 fixedly installed on the upper surface of the transverse movable frame 2, and a first storage component 5 and a second storage component 6 for feeding the mixing tank group 4 are also provided on the transverse movable frame 2, and a feeding component 7 for conveying the material of the second storage component 6 to the mixing tank group 4 is also provided at the lower end of the transverse movable frame 2.

[0043] Reference Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10The feeding assembly 7 includes a feeding tank 71, a rotary feeding component 72, a feeding pipe assembly 73, and a gas compressor 74. The feeding tank 71 includes an annular shell 711, an arc-shaped cover plate 712, and a conical shell 713. The arc-shaped cover plate 712 and the conical shell 713 are respectively fixed to the upper and lower ends of the annular shell 711. A guide vertical pipe 714 connected to the discharge pipe 611 is vertically fixed at the center of the upper end face of the arc-shaped cover plate 712. An auxiliary bearing 715 is sleeved on the outer side of the lower end of the guide vertical pipe 714. A lower discharge pipe 716 is sealed and fixed at the lower end of the conical shell 713. The rotary feeding component 72 includes an annular seat 721, a pneumatic blade 722, a V-shaped frame 723, and a conveying rod 724. The annular seat 721 is connected to the guide vertical pipe 611 via the auxiliary bearing 715. The vertical flow pipe 714 is rotatably connected, the pneumatic blades 722 are evenly fixed on the outer surface of the annular seat 721 along the circumferential direction, the V-shaped frame 723 is fixedly installed on the lower end face of the annular seat 721, the conveying rod 724 is coaxially arranged with the annular seat 721, the head of the conveying rod 724 is fixedly connected to the V-shaped frame 723, and the lower end of the conveying rod 724 extends into the lower discharge pipe 716. The outer surface of the conveying rod 724 is also fixed with a spiral discharge blade 725. The gas compressor 74 is fixed on the outer support plate 22, and the gas compressor 74 outlet pipe is sealed and connected to the arc-shaped cover plate 712 of the sending tank 71. One end of the feeding pipe assembly 73 is sealed and connected to the lower discharge pipe 716, and the other end of the feeding pipe assembly 73 is connected to the feeding bin 423. The integrated structure of the pneumatically driven rotary feeder 72 eliminates the need for an additional drive motor inside the feeding tank 71. This simplifies the equipment structure, reduces space requirements, and facilitates a fully sealed feeding tank 71, effectively isolating it from external moisture and preventing the biodegradable polyester raw materials / prepolymer products from absorbing moisture, oxidizing, and deteriorating, thus ensuring product quality stability. It combines the advantages of pneumatic conveying and mechanical screw feeding: compressed air serves as both the power source and the conveying medium for the rotary feeder 72, working in conjunction with the mechanical pushing of the screw discharge blades 725. This solves the problems of uneven feeding and easy material breakage associated with pneumatic conveying alone, and the problems of clogging and poor sealing associated with mechanical feeding alone, meeting the needs of long-cycle continuous production of biodegradable polyester. The feeding tank 71 employs a combined structure of an arc-shaped cover plate 712, an annular shell 711, and a conical shell 713. There are no dead zones in the airflow inside the tank, preventing raw materials from accumulating on the tank walls. This reduces material waste and prevents residual raw materials from degrading and contaminating subsequent batches, ensuring batch stability in production. The rotating feeder 72 is coaxially sleeved on the outside of the guide vertical pipe 714 via the auxiliary bearing 715. It has a compact structure, high coaxiality, low vibration and low wear during rotation, which can extend the service life of the equipment. The V-shaped frame 723 connects to the conveying rod 724 with high structural support strength, which can withstand the load of large flow feeding and is suitable for the needs of large-scale continuous production.

[0044] The working process of this biodegradable polyester continuous production system is as follows: Pre-production positioning and installation: First, fix the equipment base frame 1 on the production workshop floor. Adjust the position of the transverse movable frame 2 according to the production process layout. After the transverse movable frame 2 slides along the horizontal guide rail 122 of the equipment base frame 1 to the set position, the PLC controls the electromagnet 23 to be energized. The electromagnet 23 attracts the middle plate 121 and the vertical baffle 123 to complete the quick locking and fixing of the transverse movable frame 2. Then, push the esterification reactor 3 to slide along the bottom frame 11. After adjusting to the set position, screw the fixing bolt through the connecting through hole 313 of the bending seat 311 into the positioning screw hole 10 to complete the fixing of the esterification reactor 3.

[0045] Raw material pretreatment and storage: Solid PTA is put into the PTA storage silo 61 of the second storage component 6, the silo cover 62 is closed and the PLC starts the drying component. The drying component continuously heats the inside of the PTA storage silo 61, controls the temperature inside the silo at about 70°C, and stabilizes the moisture content of PTA below 0.1% to prevent PTA from absorbing moisture and clumping. Liquid EG is injected into the EG storage tank 51 of the first storage component 5 and sealed for later use.

[0046] Continuous feeding and mixing: After formal production starts, the PLC opens the pneumatic control valve of the discharge pipe 611 at the lower end of the PTA storage silo 61. The material is fed into the internal cavity of the sending tank 71 through the guide vertical pipe 714 at the center of the arc-shaped cover plate 712 of the sending tank 71 via the discharge pipe 611. The gas compressor 74 is started to seal and introduce dry compressed air / inert gas into the interior of the sending tank 71. After the compressed air enters the cavity, it blows the pneumatic blades 722 that are evenly distributed around the annular seat 721. The pneumatic blades 722 are driven by the force to rotate the annular seat 721 coaxially along the guide vertical pipe 714 via the auxiliary bearing 715, which in turn drives the V-shaped frame 723 and the conveying rod 724 to rotate synchronously. Material entering the feeding tank 71, under the combined action of its own gravity, the pushing force of the compressed airflow, and the mechanical pushing force of the spiral discharge blades 725, gathers downward along the conical surface of the conical shell 713 and enters the lower discharge pipe 716 at the lower end of the conical shell 713. It is then fed into the feeding pipe assembly 73 via the lower discharge pipe 716, and finally, the feeding pipe assembly 73 continuously and stably transports the material to the feed hopper 423 of the next production section, completing the feeding process. If a small amount of material adheres to the inner wall of the feeding tank 71, it will be continuously washed away by the compressed airflow. Combined with the airflow disturbance caused by the rotation of the spiral blades, the adhered material will fall off and be sent into the lower discharge pipe 716, preventing residue accumulation and blockage problems, thus ensuring long-term continuous and stable operation.

[0047] Simultaneously, the metering pump 52 of the first storage component 5 is started, and EG is precisely delivered into the mixing tank group 4 according to the process ratio, completing the feeding. Then, the PLC starts the top motor 441 of the mixing tank group 4. The top motor 441 drives the drive rod 442 and drive gear 443 to rotate. The drive gear 443 meshes and drives the driven gears 435 of all mixing mechanisms 43 to rotate synchronously, which in turn drives the long shaft 431 to rotate. The mixing top impeller 432 and mixing bottom impeller 434 on the long shaft 431 rotate synchronously, stirring the upper and lower layers of materials in the tank respectively. During mixing, the impeller 433 floats up and down along the long shaft 431 under the action of material resistance and buffer spring 436, constantly disturbing the middle layer of materials, avoiding PTA deposition, and achieving uniform mixing throughout the tank without blind spots.

[0048] Continuous esterification reaction: After the mixing is completed, open the valve of the external discharge pipe 413 of the mixing tank group 4, and discharge the uniformly mixed material into the reactor body 31 of the esterification reactor 3. Start the reaction stirrer 32, control the reaction temperature and pressure to carry out the esterification reaction, and continuously produce esterification products to achieve continuous production.

[0049] Maintenance operations: When it is necessary to maintain the mixing tank group 4 or clean the esterification reactor 3, simply control the electromagnet 23 to de-energize it, and the horizontal movable frame 2 can be pushed out along the guide rail to disassemble and clean the mixing tank group 4; unscrew the fixing bolts of the esterification reactor 3, and the esterification reactor 3 can be pushed out along the bottom frame 11. No hoisting equipment is required to complete the scale removal, parts replacement and other maintenance operations, which greatly reduces the difficulty of maintenance.

[0050] The above are preferred embodiments of the present invention. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. A biodegradable polyester continuous production system, including an equipment base frame (1), characterized in that: A transverse movable frame (2) is installed on the upper end face of the equipment base frame (1). The transverse movable frame (2) is slidably connected to the equipment base frame (1). An esterification reactor (3) is vertically installed in the equipment base frame (1). The esterification reactor (3) is slidably connected to the equipment base frame (1). Positioning screw holes (10) for fixing the esterification reactor (3) are provided at both ends of the equipment base frame (1). A mixing tank group (4) is fixedly installed on the upper end face of the transverse movable frame (2). A first storage component (5) and a second storage component (6) for supplying material to the mixing tank group (4) are also provided on the transverse movable frame (2). A feeding component (7) for conveying the material of the second storage component (6) to the mixing tank group (4) is also provided at the lower end of the transverse movable frame (2).

2. The biodegradable polyester continuous production system according to claim 1, characterized in that: The equipment base frame (1) includes a base frame (11) and a top frame (12) for sliding installation of the horizontal movable frame (2). The top frame (12) is arranged parallel above the base frame (11). The top frame (12) includes a middle plate (121), a horizontal guide rail (122) and a vertical baffle (123). The horizontal guide rail (122) is fixed parallel to both ends of the middle plate (121). The vertical baffle (123) is fixed vertically to one end of the horizontal guide rail (122). The base frame (11) is also provided with a vertical support rod (111) and an inclined support rod (112) to support the horizontal guide rail (122). The four corners of the lower end face of the base frame (11) are fixed with a stable base plate (113).

3. The biodegradable polyester continuous production system according to claim 2, characterized in that: The transverse movable frame (2) includes a bent support frame (21) and an outer support plate (22) for the mixing tank assembly (4) to be installed. The bent support frame (21) is slidably installed on the upper surface of the horizontal guide rail (122), and a limiting side plate (211) is provided at one end of the bent support frame (21). The limiting side plate (211) is fixedly connected to the bent support frame (21), and an electromagnet (23) that can be attracted to the middle plate (121) and the vertical baffle (123) is embedded and fixed in the limiting side plate (211). The electromagnet (23) passes through both ends of the limiting side plate (211). The outer support plate (22) is provided at the head of the other end of the bent support frame (21), and the outer support plate (22) is fixedly connected to the bent support frame (21).

4. The biodegradable polyester continuous production system according to claim 3, characterized in that: The esterification reactor (3) includes a reactor body (31), a reaction stirrer (32), and a feed pipe (33). Both ends of the reactor body (31) are provided with bending seats (311) that cooperate with the bottom frame (11). The bending seats (311) are fixedly connected to the reactor body (31), and an auxiliary wheel (312) is rotatably installed in the bending seat (311). The auxiliary wheel (312) is supported on the upper end face of the bottom frame (11). The outer end of the bending seat (311) is provided with a connecting through hole (313) corresponding to the positioning screw hole (10). The reaction stirrer (32) is vertically fixed at the center of the upper end face of the reactor body (31), and the feed pipe (33) is inclinedly fixed on the upper end face of the reactor body (31).

5. The biodegradable polyester continuous production system according to claim 4, characterized in that: The mixing tank group (4) includes a bottom tank shell (41), a top tank shell (42), and several mixing mechanisms (43). The top tank shell (42) is sleeved on the bottom tank shell (41), and the top tank shell (42) and the bottom tank shell (41) are sealed and fixedly connected. An oil seal shell (421) is fixed at the center of the upper end face of the top tank shell (42). Gear boxes (422) are integrally formed on both sides of the lower end of the oil seal shell (421). The mixing mechanisms (43) are evenly installed in the top tank shell (42) along the circumferential direction, and the mixing mechanisms (43) are rotatably connected to the top tank shell (42). A driving component (44) for driving all mixing mechanisms (43) to rotate is fixedly installed on the upper end face of the oil seal shell (421).

6. The biodegradable polyester continuous production system according to claim 5, characterized in that: The bottom tank shell (41) includes an outer base (411) and an inner arc shell (412). The inner arc shell (412) is fixedly installed on the upper end face of the outer base (411), and an external drain pipe (413) is set at the center of the lower end face of the outer base (411). The upper end face of the top tank shell (42) is fixed with a feed hopper (423) and a liquid inlet pipe (424). The driving component (44) includes a top motor (441) and a driving inner rod (442). The top motor (441) is fixedly installed on the upper end face of the oil seal shell (421). The driving inner rod (442) is rotatably installed in the oil seal shell (421), and the head of the driving inner rod (442) is fixed to the output shaft of the top motor (441). A driving gear (443) is sleeved and fixed on the driving inner rod (442).

7. The biodegradable polyester continuous production system according to claim 6, characterized in that: The mixing mechanism (43) includes a long shaft (431), a mixing top impeller (432), a mixing middle impeller (433), and a mixing bottom impeller (434). The long shaft (431) is rotatably mounted in the top tank shell (42), and the head of the long shaft (431) extends into the oil seal shell (421). A driven gear (435) meshing with the drive gear (443) is sleeved and fixed on the head of the long shaft (431). The mixing top impeller (432) is located above the mixing bottom impeller (434), and both the mixing top impeller (432) and the mixing bottom impeller (434) are sleeved and fixed on the top impeller (431). At the lower end of the long shaft (431), several sets of synchronous connecting rods (437) are provided between the mixing top impeller (432) and the mixing bottom impeller (434). The mixing middle impeller (433) is located between the mixing top impeller (432) and the mixing bottom impeller (434). The upper and lower ends of the mixing middle impeller (433) are provided with buffer springs (436) that are respectively connected to the mixing top impeller (432) and the mixing bottom impeller (434). The mixing middle impeller (433) is sleeved and installed on the long shaft (431), and the mixing middle impeller (433) is slidably connected to the long shaft (431).

8. The biodegradable polyester continuous production system according to claim 7, characterized in that: The first storage component (5) includes an EG storage tank (51) and a metering pump (52). The EG storage tank (51) is fixedly installed on the outer support plate (22), and the metering pump (52) is fixedly installed on the upper end face of the EG storage tank (51). The outlet of the metering pump (52) is provided with a supply pipe (521) connected to the inlet pipe (424).

9. The biodegradable polyester continuous production system according to claim 8, characterized in that: The second storage assembly (6) includes a PTA storage silo (61), a sealing cover (62), and a drying assembly. The PTA storage silo (61) is vertically fixed on the outer support plate (22), and a discharge pipe (611) is provided on the lower end face of the PTA storage silo (61). A control valve is installed in the discharge pipe (611). The sealing cover (62) is sealed and fixed on the upper end face of the PTA storage silo (61). The drying assembly is fixedly installed on the inner side of the top surface of the sealing cover (62).

10. The biodegradable polyester continuous production system according to claim 9, characterized in that: The feeding assembly (7) includes a feeding tank (71), a rotary feeding component (72), a feeding pipe assembly (73), and a gas compressor (74). The feeding tank (71) includes an annular shell (711), an arc-shaped cover plate (712), and a conical shell (713). The arc-shaped cover plate (712) and the conical shell (713) are respectively fixed at the upper and lower ends of the annular shell (711). A vertically fixed part is located at the center of the upper surface of the arc-shaped cover plate (712). A guide vertical pipe (714) connected to the discharge pipe (611) is provided with an auxiliary bearing (715) on the outer side of the lower end of the guide vertical pipe (714). The lower end of the conical shell (713) is sealed and fixed with a lower discharge pipe (716). The rotating feeding component (72) includes an annular seat (721), pneumatic blades (722), a V-shaped frame (723), and a conveying rod (724). The annular seat (721) is connected to the auxiliary bearing (715) via the auxiliary bearing (716). 5) Rotatably connected to the guide vertical pipe (714), the pneumatic blades (722) are evenly fixed on the outer surface of the annular seat (721) along the circumferential direction, the V-shaped frame (723) is fixedly installed on the lower end face of the annular seat (721), the conveying rod (724) is coaxially arranged with the annular seat (721), the head of the conveying rod (724) is fixedly connected to the V-shaped frame (723), and the lower end of the conveying rod (724) extends into the lower row. In the pipe (716), a spiral discharge blade (725) is fixed on the outer side of the conveying rod (724). The gas compressor (74) is fixed on the outer support plate (22), and the gas compressor (74) outlet pipe is sealed to the arc cover plate (712) of the sending tank (71). One end of the feeding pipe group (73) is sealed to the lower pipe (716), and the other end of the feeding pipe group (73) is connected to the feeding bin (423).

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