Automatic vacuum polyester reaction equipment for chemical industry

Abstract

This invention discloses an automatic vacuum polyester reaction device for chemical applications, comprising a vacuum reactor. A feed pipe is located on one side of the top of the vacuum reactor; a vacuum tube is connected to the other side, and a vacuum pump body is connected to the end of the vacuum tube. A rotating tube is rotatably connected to the top of the vacuum tube, and the rotating tube is connected to the main shaft of a drive motor. A hollow scraper is fitted onto the inner wall of the vacuum tube. In this invention, the vacuum pump, in conjunction with the rotating tube, rotates, causing the hollow scraper inserted inside the vacuum tube to rotate. This facilitates the scraping off of small-molecule oligomers adhering to the inner wall of the vacuum tube. Simultaneously, during the scraping process, an elastic airbag is intermittently compressed, continuously inflating the hollow scraper. Heating is achieved by an electric heating wire, and the air is then ejected from the inclined air holes on the hollow scraper, acting on the inner wall of the vacuum tube. This facilitates the flow of the adhering small-molecule oligomers, enhancing the removal effect and improving cleaning efficiency, all without the need for manual control.

Description

Technical Field

[0001] This invention relates to the field of polyester reaction technology, and more specifically to an automatic vacuum polyester reaction device for chemical applications. Background Technology

[0002] Polyester reactions generally need to be carried out in a vacuum environment, which is created by a vacuum system. The function of the vacuum system is to remove the ethylene glycol produced during the polycondensation reaction, so that the reaction proceeds in the direction of chain growth. In addition, it also needs to remove the small amount of water, aldehydes and other non-condensable gases produced during the reaction, and provide the vacuum conditions required for the reaction to ensure product quality. During the vacuum treatment process, small molecule oligomers will adhere to the walls of the vacuum pipes, which need to be treated.

[0003] Chinese Patent Publication No. CN212442407U, entitled "An Online Thermal Cleaning Device for a Polyester Vacuum System," includes a prepolymerization kettle, a spray condenser, and an ethylene glycol heater. The prepolymerization kettle is connected to the spray condenser via a connecting pipe, and the prepolymerization kettle and the spray condenser are sealed and fixedly connected. The ethylene glycol heater is located on the outside of the spray condenser and is sealed to the spray condenser via a steam pipe. This solution uses high-temperature ethylene glycol steam to periodically thermally clean the vacuum pipeline, preventing oligomers from adhering to the inner wall of the vacuum pipeline and affecting the vacuuming effect.

[0004] The shortcomings of the existing technical solutions are as follows: the solutions rely solely on high-temperature ethylene glycol vapor to remove oligomers adhering to the inner wall of the vacuum pipe, resulting in a generally poor removal effect and low efficiency. Each time ethylene glycol vapor is used for cleaning, the ethylene glycol addition regulating valve and circulation pump need to be manually opened periodically to introduce ethylene glycol into the ethylene glycol heater for heating, and then the ethylene glycol vapor is released into the vacuum pipe through the steam pipe. This makes it impossible to operate synchronously with the vacuum device, requiring manual periodic checks on the accumulation of deposits on the inner wall of the vacuum pipe, resulting in unsatisfactory performance. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic vacuum polyester reaction device for chemical applications, in order to solve the technical problems of low efficiency in removing oligomers adhering to the inner wall of the vacuum pipe in existing polyester reaction devices, and the need for regular manual inspection and operation, which is not convenient.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution:

[0007] An automatic vacuum polyester reaction device for chemical use includes a vacuum reactor. A feed pipe is provided on one side of the top of the vacuum reactor, and a vacuum pipe is connected to the other side. The end of the vacuum pipe is connected to a vacuum pump body, and the vacuum pump body is equipped with a drive motor.

[0008] A sealing valve assembly is provided on the feed pipe; a start button switch electrically connected to the vacuum pump body is provided on the outer wall of the vacuum reactor, and the start button switch cooperates with the sealing valve assembly.

[0009] The top of the vacuum tube is rotatably connected to a rotating tube, which is connected to the main shaft of the drive motor. A hollow scraper is attached to the inner wall of the vacuum tube and communicates with the rotating tube. Multiple oblique air holes are longitudinally and equidistantly opened on the hollow scraper. Both the hollow scraper and the rotating tube are thermally conductive metal bodies, and heating wires are provided on their inner walls. A linkage air intake mechanism is provided at the top of the rotating tube. A baffle mechanism is provided on the hollow scraper, and a discharge mechanism is provided at the bottom of the vacuum tube.

[0010] As a further aspect of the present invention: the linkage air intake mechanism includes an elastic airbag, the elastic airbag is connected to the top end of the rotating tube, one end of the elastic airbag is connected to a one-way air intake valve, the other end is connected to a one-way air outlet valve, and the one-way air outlet valve is connected to the rotating tube, the end of the elastic airbag away from the rotating tube is connected to a movable convex ball, and the vacuum pump body is connected to a fixed convex ball that cooperates with the movable convex ball.

[0011] As a further embodiment of the present invention: the baffle mechanism includes a rotating baffle and a U-shaped scraper. The rotating baffle is connected to the hollow scraper via a spring-loaded hinge. The U-shaped scraper is disposed on the upper side of the rotating baffle and is slidably connected to the hollow scraper. A traction mechanism is connected between the U-shaped scraper and the movable convex ball.

[0012] As a further embodiment of the present invention: the traction mechanism includes a linkage steel wire, one end of which is connected to a movable convex ball and the other end is inserted into a vacuum tube. A first fixed pulley that cooperates with the linkage steel wire is connected to one side of the top of the rotating tube. A second fixed pulley that cooperates with the linkage steel wire is connected to the bottom of the hollow scraper. The U-shaped scraper is connected to the linkage steel wire.

[0013] As a further embodiment of the present invention: the emission mechanism includes a lifting base plate and a second valve plate. The lifting base plate is fitted into the bottom of the vacuum tube, the second valve plate is slidably inserted into one side of the bottom of the vacuum tube, and the second valve plate is connected to the lifting base plate. A support spring is connected between the second valve plate and the outer wall of the vacuum tube. A top rod is slidably connected to the bottom of the hollow scraper, and one end of the linkage steel wire near the U-shaped scraper is connected to the top rod.

[0014] As a further aspect of the present invention: a strip groove is provided on the hollow scraper, the U-shaped scraper is slidably connected to the strip groove, and a limit spring is connected between the U-shaped scraper and the strip groove.

[0015] As a further aspect of the present invention: the sealing valve assembly includes an electric telescopic rod and a first valve plate, the electric telescopic rod is connected to the vacuum reactor, the first valve plate is slidably inserted into the feed pipe, and the first valve plate is connected to the telescopic end of the electric telescopic rod.

[0016] As a further aspect of the present invention: a linkage gear is coaxially connected to the rotating tube, and a reduction gear set is connected to the main shaft end of the drive motor, and the reduction gear set is connected to the linkage gear.

[0017] The beneficial effects of this invention are:

[0018] 1. After the feed pipe of this invention introduces an appropriate amount of polyester reaction material into the vacuum reactor, it is sealed by the sealing valve assembly. The sealing valve assembly then acts on the start button switch, causing the vacuum pump to start automatically. After the vacuum pump starts, its drive motor runs. The drive motor drives the rotating tube to rotate by the combination of the reduction gear set and the linkage gear. The rotating tube drives the hollow scraper inserted in the vacuum tube to rotate, which facilitates the scraping off of small molecule oligomers attached to the inner wall of the vacuum tube. At the same time, during the scraping process, the elastic airbag is intermittently squeezed, continuously inflating the hollow scraper. It is heated by the heating wire and then sprayed out from the inclined air hole on the hollow scraper to act on the inner wall of the vacuum tube, which facilitates the flow of the attached small molecule oligomers, enhances the removal effect, improves the cleaning efficiency, and eliminates the need for manual control.

[0019] 2. The rotating baffles distributed on the hollow scraper of the present invention are used to intercept small molecule oligomers drawn into the vacuum tube, which facilitates the adhesion of small molecule oligomers. Each time the elastic airbag is squeezed, the movable convex ball at the end of the elastic airbag pulls the linkage steel wire. The linkage steel wire pulls the U-shaped scraper above the rotating baffle to slide down along the hollow scraper, so as to scrape off the small molecule oligomers attached to the outer wall of the hollow scraper and the rotating baffle.

[0020] 3. The vacuum tube of the present invention is provided with an openable lifting base plate. Whenever the linkage steel wire pulls the U-shaped scraper down, it simultaneously pulls the top rod down. In this way, the top rod pushes down to open the lifting base plate. At the same time, the lifting base plate drives the connected second valve plate to descend and close the end near the vacuum pump, so that the small molecule oligomers removed can be discharged from the open position of the lifting base plate. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0024] Figure 3 yes Figure 2 Enlarged structural diagram at point B;

[0025] Figure 4 This is a top view cross-sectional structural diagram of the hollow scraper and vacuum tube connection in this invention;

[0026] Figure 5 yes Figure 1 A magnified structural diagram at point C.

[0027] In the diagram: 1. Vacuum reactor; 2. Feed pipe; 3. First valve plate; 4. Start button switch; 5. Electric telescopic rod; 6. Vacuum pump body; 7. Drive motor; 8. Vacuum tube; 9. Elastic air bladder; 10. Sliding guide rod; 11. Movable convex ball; 12. One-way air inlet valve; 13. One-way air outlet valve; 14. Linkage gear; 15. Reduction gear set; 16. Hollow scraper; 17. Inclined air hole; 18. U-shaped scraper; 19. Rotating baffle; 20. Linkage steel wire; 21. Rotary pipe; 22. Fixed convex ball; 23. Strip groove; 24. Second fixed pulley; 25. First fixed pulley; 26. Top rod; 27. Lifting base plate; 28. Second valve plate; 29. ​​Support spring; 30. Heating wire; 31. Connecting plate. Detailed Implementation

[0028] 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. 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.

[0029] like Figures 1-5 As shown, an automatic vacuum polyester reaction device for chemical use includes a vacuum reactor 1. A feed pipe 2 is provided on one side of the top of the vacuum reactor 1. The feed pipe 2 is used to introduce the materials required for the polyester reaction into the vacuum reactor 1. The top of the vacuum reactor 1 is equipped with a cover for easy opening and removal of the reacted materials. A sealing valve assembly is provided on the feed pipe 2. The sealing valve assembly includes an electric telescopic rod 5 and a first valve plate 3. The electric telescopic rod 5 is fixedly connected to the vacuum reactor 1 through a frame. The first valve plate 3 slides through the feed pipe 2 and is connected to the telescopic end of the electric telescopic rod 5. When an appropriate amount of material is introduced into the vacuum reactor 1, the electric telescopic rod 5 is controlled to extend, causing the first valve plate 3 to descend and block the feed pipe 2, thereby sealing the feed position.

[0030] A vacuum tube 8 is vertically connected to the other side of the top of the vacuum reactor 1, and a vacuum pump body 6 is connected to the end of the vacuum tube 8. The vacuum pump body 6 is a rotary vane vacuum pump and is equipped with a drive motor 7. The drive motor 7 drives the internal vanes to rotate, and then generates negative pressure, so as to create a vacuum environment inside the vacuum reactor 1 through the vacuum tube 8. A start button switch 4 electrically connected to the vacuum pump body 6 is installed on the outer wall of the vacuum reactor 1. The start button switch 4 cooperates with the sealing valve assembly. The extension end of the electric telescopic rod 5 in the sealing valve assembly is above the start button switch 4. When the electric telescopic rod 5 extends and drives the first valve plate 3 to descend and close the feed pipe 2, the extension end of the electric telescopic rod 5 touches the start button switch 4. The start button switch 4 then starts the vacuum pump body 6, realizing automatic start of vacuuming operation.

[0031] A rotating tube 21 is rotatably connected to the top of the vacuum tube 8. The rotating tube 21 passes through the top of the vacuum tube 8 and is connected to the main shaft of the drive motor 7. Specifically, a linkage gear 14 is coaxially connected to the rotating tube 21, and a reduction gear set 15 is connected to the main shaft of the drive motor 7. The reduction gear set 15 is connected to the linkage gear 14. When the vacuum pump body 6 is started, the drive motor 7 is started, and its main shaft drives the reduction gear set 15 to run. The reduction gear set 15 transmits the power to the linkage gear 14, causing the linkage gear 14 to drive the rotating tube 21 to rotate. A hollow scraper 16 is attached to the inner wall of the vacuum tube 8 and is connected to the rotating tube 21. Multiple inclined air holes 17 are longitudinally and equidistantly opened on the hollow scraper 16. The inclined air holes 17 are tilted towards the inner wall of the vacuum tube 8. Both the hollow scraper 16 and the rotating tube 21 are heat-conducting metal bodies, and heating wires 30 are embedded in the inner walls of both. A linkage air intake mechanism is provided at the top of the rotating tube 21.

[0032] The linkage air intake mechanism includes an elastic airbag 9, which is connected to the top of the rotating tube 21 via a connecting plate 31. The elastic airbag 9 can be compressed laterally. One end of the elastic airbag 9 is connected to a one-way air intake valve 12, and the other end is connected to a one-way air outlet valve 13. The one-way air outlet valve 13 is connected to the rotating tube 21. The one-way air intake valve 12 allows the elastic airbag 9 to draw air from the external environment. When the elastic airbag 9 is compressed, the one-way air outlet valve 13 facilitates the introduction of the compressed gas into the rotating tube 21. The end of the elastic airbag 9 away from the rotating tube 21 is connected to a movable convex ball 11. A sliding guide rod 10 is fixedly connected to the movable convex ball 11, and the sliding guide rod 10 slides through the connecting plate 31. A fixed convex ball 22 that cooperates with the movable convex ball 11 is connected to the vacuum pump body 6.

[0033] When the vacuum pump body 6 starts running, the main shaft of the drive motor 7 rotates, causing the rotating tube 21 to rotate in conjunction. The hollow scraper 16 at the bottom of the rotating tube 21 scrapes along the inner wall of the vacuum tube 8, removing the attached small molecule oligomers. At the same time, whenever the elastic air bladder 9 on the rotating tube 21 rotates and approaches the fixed convex ball 22, a lateral compression occurs between the fixed convex ball 22 and the movable convex ball 11. In this way, the movable convex ball 11 compresses the elastic air bladder 9, causing the air inside it to be discharged into the rotating tube 21 through the one-way exhaust valve 13. The air flows into the hollow scraper 16 through the rotating tube 21. At the same time, the heating wire 30 inside the rotating tube 21 and the hollow scraper 16 is energized and heated. Then, the hot air is ejected from the oblique air holes 17 distributed on the hollow scraper 16 and acts on the inner wall of the vacuum tube 8, which facilitates the flow of the attached small molecule oligomers and enhances the removal effect. At the same time, since the hollow scraper 16 is a heat-conducting metal body, its outer wall is also heated, which facilitates the flow of the oligomers attached to the hollow scraper 16 down to the inner bottom of the vacuum tube 8.

[0034] A baffle mechanism is provided on the hollow scraper 16. The baffle mechanism includes a rotating baffle 19 and a U-shaped scraper 18. The rotating baffle 19 is connected to the hollow scraper 16 via a spring-loaded hinge, and multiple rotating baffles 19 are provided, evenly distributed along the hollow scraper 16. The rotating baffle 19 is also a heat-conducting metal body and has an embedded heating wire 30. Multiple U-shaped scrapers 18 are provided, correspondingly distributed on the upper side of the rotating baffles 19, and the U-shaped scrapers 18 are slidably connected to the hollow scraper 16. Specifically, the hollow scraper 16 has a strip groove 23, and the U-shaped scrapers 18 are attached to the outer wall of the hollow scraper 16 and slidably connected to the strip groove 23. A limit spring (not shown in the figure) is connected between plate 18 and strip groove 23. A traction mechanism is connected between U-shaped scraper 18 and movable convex ball 11. The traction mechanism includes linkage steel wire 20. One end of linkage steel wire 20 is connected to movable convex ball 11, and the other end passes through vacuum tube 8. Linkage steel wire 20 passes along rotating tube 21. A first fixed pulley 25 that cooperates with linkage steel wire 20 is connected to one side of the top of rotating tube 21. A second fixed pulley 24 that cooperates with linkage steel wire 20 is connected to the bottom of hollow scraper 16. The first fixed pulley 25 and the second fixed pulley 24 cause linkage steel wire 20 to turn. U-shaped scraper 18 is connected to linkage steel wire 20.

[0035] The rotating baffle 19 on the hollow scraper 16 is used to obstruct the small molecule oligomers drawn into the vacuum tube 8, so that the small molecule oligomers can adhere to the rotating baffle 19. Whenever the movable convex ball 11 compresses the elastic airbag 9, the movable convex ball 11 pulls the linkage steel wire 20. The linkage steel wire 20 is pulled downward by the steering action of the first fixed pulley 25 and the second fixed pulley 24, so that the connected U-shaped scraper 18 can slide down. When each U-shaped scraper 18 slides down, it scrapes the outer wall of the hollow scraper 16 and also squeezes and scrapes the corresponding rotating baffle 19, so that the oligomers attached to the surface of the rotating baffle 19 and the hollow scraper 16 are detached. When the movable convex ball 11 and the elastic airbag 9 are reset, the linkage steel wire 20 is relaxed, and all the U-shaped scrapers 18 slide back to their reset positions. The rotating baffle 19 also rotates back to its reset position. This action can be repeated.

[0036] The bottom of the vacuum tube 8 is provided with a discharge mechanism, which includes a lifting base plate 27 and a second valve plate 28. The lifting base plate 27 is horizontally fitted into the bottom of the vacuum tube 8, and the second valve plate 28 is vertically slidably inserted into one side of the bottom of the vacuum tube 8. The second valve plate 28 and the lifting base plate 27 are connected by a rod. A support spring 29 is connected between the second valve plate 28 and the outer wall of the vacuum tube 8. The bottom of the hollow scraper 16 is slidably connected with a top rod 26, that is, the top rod 26 is slidably connected to the strip groove 23 on the hollow scraper 16, and the end of the linkage steel wire 20 near the U-shaped scraper 18 is connected to the top rod 26.

[0037] Whenever the linkage wire 20 pulls the U-shaped scraper 18 down, the linkage wire 20 also drives the top rod 26 down. In this way, the top rod 26 pushes the lifting base plate 27 down, and the lifting base plate 27 descends, opening the bottom of the vacuum tube 8 to facilitate the discharge of the oligomers processed inside. At the same time, the lifting base plate 27 drives the second valve plate 28 down, sealing the side of the vacuum tube 8 connected to the vacuum pump body 6, facilitating the discharge of the collected oligomers.

[0038] The working principle of this invention is as follows: The materials required for the polyester reaction are introduced into the vacuum reactor 1 through the feed pipe 2. When an appropriate amount of material is introduced into the vacuum reactor 1, the electric telescopic rod 5 is extended, causing the first valve plate 3 to descend and block the feed pipe 2, thus sealing the feed position. When the electric telescopic rod 5 extends, the telescopic end of the electric telescopic rod 5 touches the start button switch 4. Starting the start button switch 4 causes the vacuum pump body 6 to start and perform vacuuming operations.

[0039] When the vacuum pump body 6 starts running, the main shaft of its drive motor 7 rotates, driving the reduction gear set 15. The reduction gear set 15 transmits power to the linkage gear 14, causing the linkage gear 14 to rotate the rotating tube 21. The hollow scraper 16 at the bottom of the rotating tube 21 scrapes along the inner wall of the vacuum tube 8, removing the attached small molecule oligomers. Simultaneously, whenever the elastic air bladder 9 on the rotating tube 21 rotates and approaches the fixed convex ball 22, a lateral compression occurs between the fixed convex ball 22 and the movable convex ball 11. This causes the movable convex ball 11 to compress the elastic air bladder 9, causing its internal... Air from the vacuum tube 8 is discharged into the rotating tube 21 through the one-way exhaust valve 13 and flows into the hollow scraper 16 along the rotating tube 21. At the same time, the rotating tube 21 and the hollow scraper 16 are heated by the electric heating wire 30. Then the hot air is sprayed out from the oblique air holes 17 distributed on the hollow scraper 16 and acts on the inner wall of the vacuum tube 8, which facilitates the flow of the attached small molecule oligomers and enhances the removal effect. At the same time, since the hollow scraper 16 is a heat-conducting metal body, its outer wall is also heated, which facilitates the flow of the oligomers attached to the hollow scraper 16 down to the inner bottom of the vacuum tube 8.

[0040] The rotating baffle 19 on the hollow scraper 16 is used to obstruct the small molecule oligomers drawn into the vacuum tube 8, so that the small molecule oligomers can adhere to the rotating baffle 19. Whenever the movable convex ball 11 compresses the elastic airbag 9, the movable convex ball 11 pulls the linkage steel wire 20. The linkage steel wire 20 is pulled downward by the steering action of the first fixed pulley 25 and the second fixed pulley 24, so that the connected U-shaped scraper 18 can slide down. When each U-shaped scraper 18 slides down, it scrapes the outer wall of the hollow scraper 16 and also squeezes and scrapes the corresponding rotating baffle 19, so that the oligomers attached to the surface of the rotating baffle 19 and the hollow scraper 16 are detached. When the movable convex ball 11 and the elastic airbag 9 are reset, the linkage steel wire 20 is relaxed, and all the U-shaped scrapers 18 slide back to their reset positions. The rotating baffle 19 also rotates back to its reset position. This action can be repeated.

[0041] Whenever the linkage wire 20 pulls the U-shaped scraper 18 down, the linkage wire 20 also drives the top rod 26 down. In this way, the top rod 26 pushes the lifting base plate 27 down, and the lifting base plate 27 descends, opening the bottom of the vacuum tube 8 to facilitate the discharge of the oligomers processed inside. At the same time, the lifting base plate 27 drives the second valve plate 28 down, sealing the side of the vacuum tube 8 connected to the vacuum pump body 6, facilitating the discharge of the collected oligomers.

[0042] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A chemical-grade automatic vacuum polyester reaction equipment, comprising a vacuum reactor (1), wherein a feed pipe (2) is provided on one side of the top of the vacuum reactor (1); a vacuum pipe (8) is connected to the other side, and a vacuum pump body (6) is connected to the end of the vacuum pipe (8), wherein the vacuum pump body (6) is equipped with a drive motor (7); characterized in that: A sealing valve assembly is provided on the feed pipe (2); a start button switch (4) electrically connected to the vacuum pump body (6) is provided on the outer wall of the vacuum reactor (1), and the start button switch (4) cooperates with the sealing valve assembly; The top of the vacuum tube (8) is rotatably connected to a rotating tube (21), which is connected to the main shaft end of the drive motor (7). A hollow scraper (16) is attached to the inner wall of the vacuum tube (8), and the hollow scraper (16) is connected to the rotating tube (21). Multiple oblique air holes (17) are opened longitudinally and equidistantly on the hollow scraper (16). Both the hollow scraper (16) and the rotating tube (21) are heat-conducting metal bodies, and both are provided with heating wires (30) on their inner walls. A linkage air intake mechanism is provided at the top of the rotating tube (21). A baffle mechanism is provided on the hollow scraper (16), and a discharge mechanism is provided at the bottom of the vacuum tube (8). The linkage air intake mechanism includes an elastic airbag (9), which is connected to the top of the rotating tube (21). One end of the elastic airbag (9) is connected to a one-way air intake valve (12), and the other end is connected to a one-way air outlet valve (13). The one-way air outlet valve (13) is connected to the rotating tube (21). The end of the elastic airbag (9) away from the rotating tube (21) is connected to a movable convex ball (11). The vacuum pump body (6) is connected to a fixed convex ball (22) that cooperates with the movable convex ball (11). The baffle mechanism includes a rotating baffle (19) and a U-shaped scraper (18). The rotating baffle (19) is connected to the hollow scraper (16) by a spring-loaded hinge. The U-shaped scraper (18) is disposed on the upper side of the rotating baffle (19) and is slidably connected to the hollow scraper (16). A traction mechanism is connected between the U-shaped scraper (18) and the movable convex ball (11). The hollow scraper (16) is provided with a strip groove (23), the U-shaped scraper (18) is slidably connected to the strip groove (23), and a limit spring is connected between the U-shaped scraper (18) and the strip groove (23).

2. The automatic vacuum polyester reaction equipment for chemical applications according to claim 1, characterized in that, The traction mechanism includes a linkage steel wire (20), one end of which is connected to a movable convex ball (11) and the other end is inserted into a vacuum tube (8). A first fixed pulley (25) that cooperates with the linkage steel wire (20) is connected to one side of the top of the rotating tube (21). A second fixed pulley (24) that cooperates with the linkage steel wire (20) is connected to the bottom of the hollow scraper (16). The U-shaped scraper (18) is connected to the linkage steel wire (20).

3. The automatic vacuum polyester reaction equipment for chemical applications according to claim 2, characterized in that, The emission mechanism includes a lifting base plate (27) and a second valve plate (28). The lifting base plate (27) is fitted into the bottom of the vacuum tube (8). The second valve plate (28) slides through one side of the bottom of the vacuum tube (8) and is connected to the lifting base plate (27). A support spring (29) is connected between the second valve plate (28) and the outer wall of the vacuum tube (8). A top rod (26) is slidably connected to the bottom of the hollow scraper (16), and the end of the linkage wire (20) near the U-shaped scraper (18) is connected to the top rod (26).

4. The automatic vacuum polyester reaction equipment for chemical applications according to claim 1, characterized in that, The closed valve assembly includes an electric telescopic rod (5) and a first valve plate (3). The electric telescopic rod (5) is connected to the vacuum reactor (1), and the first valve plate (3) slides through the feed pipe (2). The first valve plate (3) is connected to the telescopic end of the electric telescopic rod (5).

5. The automatic vacuum polyester reaction equipment for chemical applications according to claim 1, characterized in that, A linkage gear (14) is coaxially connected to the rotating tube (21), and a reduction gear set (15) is connected to the main shaft end of the drive motor (7), and the reduction gear set (15) is connected to the linkage gear (14).

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