A full-automatic gel-removing device for continuous polymerization and final polymerization reaction in spandex production

Abstract

The present application relates to a kind of continuous polymerization final polymerization reaction full-automatic gel removal device for spandex production, including PPS pipe and AMINE pipe;One end of the AMINE pipe is inserted into the PPS pipe;Rotary shaft is rotationally arranged in the AMINE pipe, one end of the rotary shaft is connected with scraper, and the scraper is located at the end face position of PPS pipe and AMINE pipe;Stable component is arranged on the rotary shaft and collides with the AMINE pipe.The professional design is carried out to the previous inlet, and the new uninterrupted full-automatic gel removal device is adopted, the rotating direction and rotating speed of scraper are controlled by frequency conversion motor, the accumulation of gel at the end of inlet can be effectively removed and avoided, so that the effect of stabilizing the gap between reactor and pipeline pressure can be achieved, the stability of final polymerization reaction in production and the stability of product quality can be effectively improved, the replacement cycle of reactor can be greatly prolonged, the discharge amount of raw solution can be reduced, and the production cost can be reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of continuous spandex spinning polymerization process, specifically a fully automatic degelling device for continuous polymerization final polymerization reaction in spandex production. Background Technology

[0002] In continuous spandex spinning production, the quality of the final polymerization reaction plays a decisive role in the production operability of downstream spinning processes and the quality of products. In addition, if the replacement cycle of the final polymerization reactor is too short, it will lead to an increase in the number of shutdowns, which will result in a significant increase in the amount of raw liquid discharged, thus increasing production costs.

[0003] Traditional reactors operate by supplying PPS and AMINE through a fixed inlet via pipeline to the final polymerization reactor. Inside, a high-speed rotating impeller rapidly mixes the PPS and AMINE, initiating a fast reaction. This final polymerization reaction is a vigorous, exothermic process that generates a certain amount of gel. Because the inlet pipeline lacks an automatic cleaning mechanism, this gel easily adheres to the inlet's end (end face and inner wall). When this accumulation reaches a certain level, two consequences occur: first, the pressure inside the pipeline increases; second, the gap between the inlet end and the impeller inside the reactor becomes smaller or uneven. Both of these factors significantly affect the quality and stability of the final polymerization reaction. In actual production, this manifests as follows: the reaction is relatively stable immediately after the reactor is replaced, but after a short period of operation, due to the increased accumulation of gel at the feed inlet, various indicators of the final polymerization reaction begin to change, and the stability of the reaction gradually deteriorates. At this point, in order to ensure the stable progress of the final polymerization reaction, the reactor must be shut down on-site to clean and replace the feed inlet. Frequent shutdowns and restarts will inevitably result in the discharge of a large amount of raw liquid, and will also have a significant impact on the quality of the polymer. In view of this, a fully automated degelling device for the continuous polymerization final polymerization reaction of spandex production is proposed. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] Given the following technical problems in the existing technology: Traditional reactors operate by using a fixed inlet device to transport PPS and AMINE through a pipeline into the final polymerization reactor. Inside the reactor, a high-speed rotating impeller rapidly and thoroughly mixes the PPS and AMINE, initiating a rapid reaction. This final polymerization reaction is a violent, exothermic process, generating a certain amount of gel. Because the inlet pipeline lacks an automatic cleaning function, this gel easily adheres to the inlet's end (end face and inner wall). When the accumulation reaches a certain level, two consequences occur: First, the pressure inside the pipeline increases. Second, the gap between the inlet end and the impeller inside the reactor becomes smaller or uneven. Both of these factors significantly affect the quality and stability of the final polymerization reaction. In actual production, this manifests as follows: the reaction is relatively stable immediately after the reactor is replaced, but after a short period of operation, due to the increased accumulation of gel at the feed inlet, various indicators of the final polymerization reaction begin to change, and the stability of the reaction gradually deteriorates. At this point, in order to ensure the stable progress of the final polymerization reaction, the reactor must be shut down on-site to clean and replace the feed inlet. Frequent shutdowns and restarts will inevitably result in the discharge of a large amount of raw liquid, and will also have a significant impact on the quality of the polymer.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a fully automatic degelling device for continuous polymerization final polymerization reaction in spandex production, comprising a PPS tube and an AMINE tube; One end of the AMINE tube is inserted into the PPS tube; The AMINE tube is equipped with a mechanical seal fixing seat and a mechanical seal at its root. A motor fixing seat is provided on the end face of the mechanical seal fixing seat. A geared motor is provided at the root of the motor fixing seat. A rotating shaft is rotatably arranged in the AMINE tube. A scraper is connected to one end of the rotating shaft. The scraper is located at the end face of the PPS tube and the AMINE tube. The rotating shaft is equipped with a stabilizing component that contacts the inner edge of the AMINE tube.

[0007] As a preferred technical solution for a fully automatic degelling device for continuous polymerization final polymerization reaction in spandex production, the scraper is located at the outlet of the PPS tube and the AMINE tube; the scraper is divided into a connecting part, a fixing part, an inner scraping part, and an outer scraping part. The inner scraping part is located between the PPS tube and the AMINE tube, the fixing part is located at the center of the AMINE tube, the connecting part is located at the end face of the AMINE tube, and the outer scraping part is close to the end face of the PPS tube.

[0008] As a preferred technical solution for a fully automated degelling device for continuous polymerization final polymerization reaction in spandex production, the AMINE tube and the mechanical seal are connected and installed through a mechanical seal fixing seat.

[0009] As a preferred technical solution for a fully automated degelling device for continuous polymerization final polymerization reaction in spandex production, the motor mounting base and the geared motor are connected and installed via a motor mounting plate.

[0010] As a preferred technical solution for a fully automated degelling device for continuous polymerization final polymerization reaction in spandex production, the stabilizing component is a rotating shaft support sleeve. The outer contour of the rotating shaft support sleeve is in the shape of a cross, the outer fork of the rotating shaft support sleeve touches the inner edge of the AMINE tube, a gap is left between the two outer fork parts of the rotating shaft support sleeve, and the inner circle of the rotating shaft support sleeve fits with the outer circle of the rotating shaft.

[0011] As a preferred technical solution for a fully automatic degelling device for continuous polymerization final polymerization reaction in spandex production, the output end of the geared motor is provided with a coupling, the coupling is located in the motor mounting base, and one end of the rotating shaft extending into the motor mounting base is connected to the coupling.

[0012] As a preferred technical solution for a fully automatic degelling device for continuous polymerization final polymerization reaction in spandex production, an AMINE feed pipe is provided at the root of the AMINE tube, the AMINE feed pipe and the AMINE tube are connected internally, and an AMINE feed flange is provided on the AMINE feed pipe.

[0013] As a preferred technical solution for a fully automatic degelling device for continuous polymerization final polymerization reaction in spandex production, a PPS feed pipe is provided on one side of the bottom of the PPS pipe, the PPS feed pipe and the interior of the PPS pipe are connected, a PPS feed flange is provided on the PPS feed pipe, and a feed port connection flange is provided on the outer contour of the PPS pipe.

[0014] As a preferred technical solution for a fully automated degelling device for continuous polymerization final polymerization reaction in spandex production, the rotating shaft and the scraper are connected by scraper fixing screws and scraper fixing positioning pins.

[0015] The beneficial effects of this invention are: The previous feed inlet has been professionally designed and a brand-new uninterrupted fully automatic degelling device has been adopted. This device controls the rotation direction and speed of the scraper through a variable frequency motor, which can effectively remove and prevent the accumulation of gel at the end of the feed inlet. This achieves the effect of stabilizing the reactor gap and pipeline pressure, effectively improving the stability of the final polymerization reaction and the stability of product quality during production, and can greatly extend the reactor replacement cycle, reduce the discharge of raw liquid, and reduce production costs.

[0016] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the left side of the present invention.

[0019] Figure 3 This is a schematic diagram of the rotating shaft support sleeve of the present invention.

[0020] Figure 4 This invention is based on Figure 1 Enlarged diagram showing the positions of the scraper, PPS tube, and AMINE tube.

[0021] Figure 5 This is a schematic diagram of the type A scraper of the present invention.

[0022] Figure 6 This is a schematic diagram of the B-type scraper of the present invention.

[0023] Figure 7 This is a schematic diagram of the C-type scraper of the present invention.

[0024] Figure 8 This is a schematic diagram of the D-type scraper of the present invention.

[0025] Reference numerals: 1. Scraper; 1-2. Fixing part; 1-1. Connecting part; 1-3. Inner scraping part; 1-4. Outer scraping part; 2. Rotating shaft; 3. Scraper fixing screw; 4. Scraper fixing positioning pin; 5. Rotating shaft support sleeve; 6. PPS tube; 7. AMINE tube; 8. Feed port connecting flange; 9. PPS feed pipe; 10. PPS feed flange; 11. AMINE feed pipe; 12. AMINE feed flange; 13. Mechanical seal fixing seat; 14. Mechanical seal; 15. Motor fixing seat; 16. Motor mounting plate; 17. Coupling; 18. Gear motor. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0028] Example, refer to Figures 1 to 8 A fully automated degelling device for continuous polymerization final polymerization reaction in spandex production, comprising a PPS tube 6 and an AMINE tube 7; One end of AMINE tube 7 is inserted into PPS tube 6; The back of the AMINE tube 7 is equipped with a mechanical seal 14. The AMINE tube 7 and the mechanical seal 14 are connected and installed through a mechanical seal mounting bracket 13. The back of the mechanical seal 14 is equipped with a motor mounting bracket 15. The back of the motor mounting bracket 15 is equipped with a geared motor 18. The motor mounting bracket 15 and the geared motor 18 are connected and installed through a motor mounting plate 16. The AMINE tube 7 is equipped with a rotating shaft 2, one end of which is connected to a scraper 1. The scraper 1 is located at the outlet of the PPS tube 6 and the AMINE tube 7. The scraper 1 is divided into a connecting part 1-1, a fixing part 1-2, an inner scraping part 1-3, and an outer scraping part 1-4. The inner scraping part 1-3 is located between the PPS tube 6 and the AMINE tube 7, the fixing part 1-2 is located at the center of the AMINE tube 7, the connecting part 1-1 is located at the end face of the AMINE tube 7, and the outer scraping part 1-4 is close to the end face of the PPS tube 6. The rotating shaft 2 and the scraper 1 are connected by a scraper fixing screw 3 and a scraper fixing positioning pin 4. The output end of the geared motor 18 is provided with a coupling 17, which is located in the motor mounting base 15. The end of the rotating shaft 2 that extends into the motor mounting base 15 is connected to the coupling 17. The rotating shaft 2 is equipped with a stabilizing component that contacts the inner edge of the AMINE tube 7. The stabilizing component is a rotating shaft support sleeve 5. The outer contour of the rotating shaft support sleeve 5 is in the shape of a cross. The outer fork part of the rotating shaft support sleeve 5 contacts the inner edge of the AMINE tube 7. There is a gap between the two outer fork parts of the rotating shaft support sleeve 5. The inner circle of the rotating shaft support sleeve 5 fits with the outer circle of the rotating shaft 2. AMINE tube 7 has an AMINE feed pipe 11 at its edge, which is connected to AMINE tube 7 internally. AMINE feed pipe 11 is equipped with an AMINE feed flange 12. PPS tube 6 has a PPS feed pipe 9 at its bottom side, which is connected to PPS tube 6 internally. PPS feed pipe 9 is equipped with a PPS feed flange 10. The outer contour of PPS tube 6 is equipped with a feed port connection flange 8.

[0029] This implementation will achieve the following: The geared motor 18 drives the rotating shaft 2 to rotate through the coupling 17. The rotating shaft 2 drives the scraper 1 to move on the inner wall and end face of the PPS tube 6 and the inner and outer walls and end of the AMINE tube 7. This can effectively remove and prevent the accumulation of gel at the end of the inlet. At the same time, during the movement of the rotating shaft 2, the rotating shaft support sleeve 5 can bear the load for the long rotating shaft 2, thereby ensuring the smooth movement of the scraper 1. This patented device employs a novel, uninterrupted, fully automatic degelling design. It abandons the limitations of traditional designs where eccentric or concentric channels fail to physically remove gel from the channels and pipe walls. By simulating different material flow rates and calculating the cross-sectional area of ​​different material channels, the device optimizes the degelling scraper design. After repeated testing, the optimal scraper design was selected. A variable frequency motor controls the device's rotation cycle and speed, effectively removing and preventing gel accumulation at the inlet end, thus completely solving the previous problem of increasing gel accumulation at the outlet end. Through the application of this device, the stability of the final polymerization reaction and the quality of the polymer are greatly improved, and the replacement cycle of the final polymerization reactor can be effectively extended. Ultimately, this achieves the effects of improving product quality, enhancing downstream spinning timing and production operability, and reducing production costs. In actual production, taking a polymerization production line with a capacity of 38 tons as an example, the stable production cycle after replacing the final polymerization reactor at the feed inlet device was generally around 7 days, and the reactor replacement cycle was generally around 30 days. The amount of waste discharged during each start-up and shutdown was about 2.0 tons. With this improvement, the cycle can be extended to about 60 days, and production can remain stable throughout the entire online cycle. Overall, the amount of waste generated during start-up and shutdown can be reduced by about 50%. On the other hand, the reduction in the number of start-ups and shutdowns also greatly reduces the fluctuations in the quality of the raw solution, which significantly improves the operability of the downstream spinning process and the stability of product quality.

[0030] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A fully automated degelling device for continuous polymerization final polymerization reaction in spandex production, characterized in that: Including PPS tube (6) and AMINE tube (7); One end of the AMINE tube (7) is inserted into the PPS tube (6); The AMINE tube (7) is equipped with an organic seal (14) at its root. A motor mounting base (15) is provided on the back of the mechanical seal (14). A geared motor (18) is provided on the back of the motor mounting base (15). A rotating shaft (2) is rotatably arranged in the AMINE tube (7). A scraper (1) is connected to one end of the rotating shaft (2). The scraper (1) is located at the end face of the PPS tube (6) and the AMINE tube (7). The rotating shaft (2) is equipped with a stabilizing component that contacts the inner edge of the AMINE tube (7).

2. The fully automated degelling device for continuous polymerization final polymerization reaction in spandex production according to claim 1, characterized in that: The scraper (1) is located at the outlet of the PPS tube (6) and the AMINE tube (7); the scraper (1) is divided into a connecting part (1-1), a fixing part (1-2), an inner scraping part (1-3), and an outer scraping part (1-4). The inner scraping part (1-3) is located between the PPS tube (6) and the AMINE tube (7). The fixing part (1-2) is located at the center of the AMINE tube (7). The connecting part (1-1) is located at the end face of the AMINE tube (7). The outer scraping part (1-4) is close to the end face of the PPS tube (6).

3. The fully automated degelling device for continuous polymerization final polymerization reaction in spandex production according to claim 1, characterized in that: The AMINE tube (7) and the mechanical seal (14) are connected and installed through the mechanical seal mounting bracket (13).

4. The fully automated degelling device for continuous polymerization final polymerization reaction in spandex production according to claim 1, characterized in that: The motor mounting base (15) and the geared motor (18) are connected and installed through the motor mounting plate (16).

5. The fully automated degelling device for continuous polymerization final polymerization reaction in spandex production according to claim 1, characterized in that: The stabilizing component is a rotating shaft support sleeve (5). The outer contour of the rotating shaft support sleeve (5) is in the shape of a cross. The outer fork of the rotating shaft support sleeve (5) touches the inner edge of the AMINE tube (7). There is a gap between the two outer fork parts of the rotating shaft support sleeve (5). The inner circle of the rotating shaft support sleeve (5) fits against the outer circle of the rotating shaft (2).

6. The fully automated degelling device for continuous polymerization final polymerization reaction in spandex production according to claim 1, characterized in that: The output end of the geared motor (18) is provided with a coupling (17), which is located in the motor mounting base (15). The rotating shaft (2) extends into one end of the motor mounting base (15) and is connected to the coupling (17).

7. The fully automated degelling device for continuous polymerization final polymerization reaction in spandex production according to claim 1, characterized in that: An AMINE feed pipe (11) is provided at the root of the AMINE tube (7). The AMINE feed pipe (11) and the AMINE tube (7) are internally connected. An AMINE feed flange (12) is provided on the AMINE feed pipe (11).

8. The fully automated degelling device for continuous polymerization final polymerization reaction in spandex production according to claim 1, characterized in that: A PPS feed pipe (9) is provided on one side of the root of the PPS pipe (6). The PPS feed pipe (9) and the PPS pipe (6) are connected internally. A PPS feed flange (10) is provided on the PPS feed pipe (9). An inlet connection flange (8) is provided on the outer contour of the PPS pipe (6).

9. The fully automated degelling device for continuous polymerization final polymerization reaction in spandex production according to claim 1, characterized in that: The rotating shaft (2) and the scraper (1) are connected by scraper fixing screws (3) and scraper fixing positioning pins (4).

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