Melt in-line screen changer low crystallization point filter extrusion screw

Abstract

This utility model discloses a melt online screen-changing low-crystal-point filter extrusion screw, including an extrusion tube with an inspection port at the rear end. The inspection port is equipped with a sealing mechanism and contains a quick-change filter screen mechanism. The sealing mechanism consists of a sealing cover, a first fixing member, a second fixing member, and bolts. The quick-change filter screen mechanism includes a second screen changing frame, a first screen changing frame, a screw, a metal ring, a first semi-circular ring, and a second semi-circular ring. The screw rotates to push the melt to be conveyed, and the cutting blade breaks up blocky impurities. The semi-circular filter screens in the first and second screen changing frames are spliced ​​to form a circular filter cross-section, achieving high-efficiency filtration across the entire cross-section. When screen replacement is required, the entire screen changing frame can be quickly removed and the filter screen replaced without stopping the machine, through a magnetically connected linkage structure. The above structure achieves low-crystal-point filtration of the melt, significantly improves impurity interception efficiency, simplifies the screen changing process, ensures production continuity, and meets the high-quality requirements of polymer material extrusion molding.

Description

Technical Field

[0001] This utility model relates to the field of polymer material processing technology, and in particular to a melt online screen-changing low crystal point filter extrusion screw. Background Technology

[0002] In the field of polymer extrusion molding, with the rapid development of high-precision industries such as electronics, optics, and medical, the requirements for product quality are becoming increasingly stringent. Among these, the purity and uniformity of the melt have become key indicators. During the extrusion production process, impurity particles and polymer agglomerates are inevitably present in the melt. If these impurities are not effectively treated, they will form crystal points in the product, seriously affecting the optical properties, mechanical properties, and appearance quality of the product. Traditional melt-filtering extrusion screws have obvious limitations in dealing with the above problems. On the one hand, their filtration system is difficult to efficiently intercept impurities, resulting in crystal point residue. On the other hand, when the filter screen intercepts too many impurities and needs to be replaced, the machine must be stopped and the equipment disassembled. This not only involves cumbersome operation procedures, but also consumes a lot of time and manpower, and interrupts production, resulting in a significant reduction in production efficiency. In addition, frequent start-ups and shutdowns of the equipment will also affect the stability of process parameters such as melt temperature and pressure, further reducing product quality and increasing production costs. Therefore, how to develop an extrusion screw that can achieve efficient filtration, online screen replacement, ensure low crystal point and high purity of the melt, and maintain continuous production has become a technical problem that urgently needs to be solved in the field of polymer extrusion molding. Utility Model Content

[0003] The purpose of this invention is to solve at least one of the technical problems existing in the prior art by providing a melt online screen-changing low crystal point filter extrusion screw with a unique filter structure design. It employs a design where the first and second screen-changing frames are arranged on the same vertical plane, and both the first and second filter screens are semi-circular structures. These two screens are joined to form a complete circular filter cross-section. This double semi-circular filter area design, while ensuring the filtration area, improves the impurity interception efficiency through the synergistic effect of the two semi-circular filter screens, ensuring the output melt has a low crystal point and high purity. Furthermore, screen changing can be performed without stopping the machine. When the filter screen has intercepted a large amount of impurities and needs replacement, first reduce the screw speed to decrease the melt flow and system pressure. Then, loosen the bolts to open the sealing cover and lift the first screen-changing frame upwards. Since the first and second screen-changing frames are linked by a metal ring, they can be removed as a whole for filter screen replacement. After replacement, reinstall them in their original positions, close the sealing cover, tighten the bolts, and gradually increase the screw speed to resume normal production. This simplifies the screen changing process and significantly improves production continuity.

[0004] This utility model also provides a low crystal point filter extrusion screw with the above-mentioned melt online screen changing function, including an extrusion tube, a maintenance port provided at the rear end of the extrusion tube, a sealing mechanism provided at the upper end of the maintenance port, and a quick screen replacement mechanism provided inside the extrusion tube. The sealing mechanism includes:

[0005] A sealing cover, which is hinged to the left side of the access port;

[0006] The first fixing member, the left end of which is fixedly connected to the sealing cover;

[0007] The second fastener is fixedly connected to the inspection port at its left end.

[0008] The quick-change filter mechanism includes:

[0009] The second screen replacement frame is located inside the extrusion tube;

[0010] The first screen replacement frame is located inside the extrusion tube;

[0011] The screw is located at the center of the extrusion tube;

[0012] A metal ring, the inner wall of which is rotatably connected to a screw via an annular groove.

[0013] According to the melt online screen changing low crystal point filter extrusion screw, the inner wall of the second fixing member is threadedly connected to the bolt, and the left end of the bolt passes through the first fixing member and extends into the interior of the second fixing member.

[0014] By adopting the above technical solution, the first and second fixing parts are connected by bolts, so that the sealing cover can tightly seal the inspection port, prevent melt leakage, ensure the sealing performance inside the extrusion tube, and facilitate the opening and closing of the sealing cover when it is necessary to change the screen.

[0015] According to the melt online screen changing low crystal point filter extrusion screw, the bottom inner wall of the extrusion tube is provided with a second slot, the inner wall of the second slot is engaged with the second screen changing frame, and the inner wall of the second screen changing frame is fixedly connected with a second filter screen.

[0016] By adopting the above technical solution, the second screen replacement frame is engaged with the second slot on the inner wall of the extrusion tube, which ensures that the position of the second screen replacement frame inside the extrusion tube is fixed.

[0017] According to the melt online screen changing low crystal point filter extrusion screw, a second semi-circular ring is fixedly connected to the upper center of the second screen changing frame, a second magnet is fixedly connected to the inner wall of the second semi-circular ring, the inner wall of the second magnet is magnetically connected to the outer surface of the metal ring, and a first filter screen is provided inside the second screen changing frame.

[0018] By adopting the above technical solution, the position of the second replacement frame is ensured to be stable, and full-section filtration is achieved in conjunction with the first filter screen.

[0019] According to the melt online screen changing low crystal point filter extrusion screw, the outer surface of the upper end of the metal ring is magnetically connected to the first magnet, the outer surface of the first magnet is fixedly connected to the first semi-circular ring, and the upper end of the first semi-circular ring is fixedly connected to the first screen changing frame.

[0020] By adopting the above technical solution, the first screen changing frame can be linked with the metal ring, which facilitates the screen changing operation. At the same time, it ensures that the position of the first screen changing frame is fixed during the filtration process, and together with the second filter screen, it completes the filtration of the melt.

[0021] According to the melt online screen changing low crystal point filter extrusion screw, the outer surface of the screw is fixedly connected with a cutting blade, and the number of cutting blades is multiple and horizontally distributed.

[0022] By adopting the above technical solution, the cutting blade can break up blocky impurities in the melt, making the impurities smaller.

[0023] According to the melt online screen changing low crystal point filter extrusion screw, the top inner wall of the sealing cover is provided with a first slot, and the inner wall of the first slot is engaged with the first screen changing frame.

[0024] By adopting the above technical solution, when closing the sealing cover after screen replacement, the position of the first screen replacement frame can be further fixed to prevent it from shaking inside the extrusion tube.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0027] Figure 1 This is an overall structural diagram of the melt online screen-changing low crystal point filter extrusion screw of this utility model;

[0028] Figure 2 This is a structural diagram of the inspection port of the melt online screen-changing low crystal point filter extrusion screw of this utility model;

[0029] Figure 3 This is a structural diagram of the filter screen position of the melt online screen-changing low crystal point filter extrusion screw of this utility model;

[0030] Figure 4 This is a diagram of the quick-release structure of the filter screen of the melt online screen-changing low crystal point filter extrusion screw of this utility model.

[0031] Legend:

[0032] 1. Extrusion tube; 2. Sealing cap; 3. Screw; 4. First fixing component; 5. Second fixing component; 6. Bolt; 7. First screen replacement frame; 8. First filter screen; 9. First slot; 10. Second filter screen; 11. Second screen replacement frame; 12. Second slot; 13. Cutting blade; 14. Annular groove; 15. Metal ring; 16. First semi-circular ring; 17. First magnet; 18. Second semi-circular ring; 19. Second magnet; 20. Inspection port. Detailed Implementation

[0033] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0034] Reference Figure 1-4 This utility model embodiment includes a melt online screen-changing low crystal point filter extrusion screw, which includes an extrusion tube 1. An inspection port 20 is provided at the rear end of the extrusion tube 1, and a sealing mechanism is provided at the upper end of the inspection port 20. A quick-change filter screen mechanism is provided inside the extrusion tube 1. The sealing mechanism includes:

[0035] Sealing cover 2, which is hinged to the left side of inspection port 20;

[0036] The first fixing member 4, the left end of the first fixing member 4 is fixedly connected to the sealing cover 2;

[0037] The second fixing member 5, the left end of the second fixing member 5 is fixedly connected to the inspection port 20;

[0038] The inner wall of the second fastener 5 is threadedly connected to the bolt 6. The left end of the bolt 6 passes through the first fastener 4 and extends into the interior of the second fastener 5.

[0039] The quick-change filter mechanism includes:

[0040] The second screen frame 11 is located inside the extrusion tube 1;

[0041] The first screen replacement frame 7 is located inside the extrusion tube 1;

[0042] Screw 3, located at the center of extrusion tube 1;

[0043] The inner wall of the metal ring 15 is rotatably connected to the screw 3 through the annular groove 14.

[0044] The inner wall of the extrusion tube 1 is provided with a second slot 12. The inner wall of the second slot 12 is engaged with the second screen changing frame 11. The inner wall of the second screen changing frame 11 is fixedly connected with a second filter screen 10. The upper center of the second screen changing frame 11 is fixedly connected with a second semi-circular ring 18. The inner wall of the second semi-circular ring 18 is fixedly connected with a second magnet 19. The inner wall of the second magnet 19 is magnetically connected with the outer surface of the metal ring 15. The inside of the second screen changing frame 11 is provided with a first filter screen 8. The outer surface of the upper end of the metal ring 15 is magnetically connected with a first magnet 17. The outer surface of the first magnet 17 is fixedly connected with a first semi-circular ring 16. The upper end of the first semi-circular ring 16 is fixedly connected with the first screen changing frame 7. The outer surface of the screw 3 is fixedly connected with a cutting blade 13. There are multiple cutting blades 13 and they are horizontally distributed. The inner wall of the top of the sealing cover 2 is provided with a first slot 9. The inner wall of the first slot 9 is engaged with the first screen changing frame 7.

[0045] Working principle: The melt online screen changing low crystal point filtration extrusion screw 3 achieves melt filtration and reduces crystal point impurities through a filtration system and online screen changing structure. At the same time, the screen can be replaced without stopping the machine. It is suitable for polymer material extrusion molding process. The screw 3 device adopts a filtration structure, with the first screen changing frame 7 and the second screen changing frame 11 arranged on the same vertical plane. Through the unique semi-circular filtration area design, continuous melt filtration and online screen changing are achieved, meeting the low crystal point filtration requirements of polymer material extrusion molding process.

[0046] The screw 3 rotates, generating axial thrust to push the melt forward from the rear end of the extrusion tube 1. During the forward movement of the melt, the cutting blade 13 on the outer surface of the screw 3 breaks up blocky impurities in the melt. The metal ring 15 is rotatably connected to the screw 3 through the annular groove 14 and rotates synchronously with the screw 3. The first screen changing frame 7 and the second screen changing frame 11, which are on the same vertical plane, are connected to the metal ring 15 through magnetic structures. The bottom of the first screen changing frame 7 is magnetically connected to the metal ring 15 through the first semi-circular ring 16 and the first magnet 17. The bottom of the second screen changing frame 11 is engaged with the second slot 12 of the extrusion tube 1. The upper end is magnetically connected to the metal ring 15 via the second semicircular ring 18 and the second magnet 19. Both the first filter screen 8 and the second filter screen 10 are semicircular structures, and the two are spliced ​​together to form a complete circular filter cross section. At the same time, the upper semicircular area covered by the first filter screen 8 and the lower semicircular area covered by the second filter screen 10 achieve full cross-section coverage filtration of the melt. This design ensures the filtration area while improving the impurity interception efficiency through the synergistic effect of the double semicircular filter screens, ensuring that the output melt has a low crystal point and high purity. When the filter screen intercepts a lot of impurities and needs to be replaced, the screen replacement operation can be carried out without stopping the machine.

[0047] First, reduce the screw speed of screw 3 to decrease melt flow and system pressure. Then, loosen bolt 6 and open sealing cover 2. Since the first screen replacement frame 7 and the second screen replacement frame 11 are on the same vertical plane and linked by metal ring 15, when the first screen replacement frame 7 is pulled upward, the magnetic connection between its bottom first semi-circular ring 16 and metal ring 15 separates. At the same time, the second screen replacement frame 11 is synchronously driven due to its magnetic connection with metal ring 15, and its bottom disengages from the second slot 12 of extrusion tube 1. At this point, the two screen replacement frames can be removed as a whole, and the first filter screen 8 and the second filter screen 10 can be replaced respectively. After replacement... After completion, the two screen replacement frames are reinstalled in their original positions. The first screen replacement frame 7 is magnetically attached to the metal ring 15 via the first semi-circular ring 16 and the first magnet 17. The bottom of the second screen replacement frame 11 is re-inserted into the second slot 12 and magnetically connected to the metal ring 15 via the second semi-circular ring 18 and the second magnet 19. Finally, the sealing cover 2 is closed and the bolts 6 are tightened. The screw speed 3 is gradually increased to resume normal production. This screen replacement frame layout on the same vertical plane and the structure design of the double semi-circular filter not only simplifies the screen replacement process but also significantly improves filtration efficiency and production continuity through full-section coverage filtration.

[0048] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A melt online screen-changing low crystal point filter extrusion screw, characterized in that, include: A compression tube (1) is provided with an inspection port (20) at its rear end. A sealing mechanism is provided at the upper end of the inspection port (20). A quick-replacement filter mechanism is provided inside the compression tube (1). The sealing mechanism includes: A sealing cover (2) is hinged to the left side of the inspection port (20); The first fixing member (4) is fixedly connected to the sealing cover (2) at its left end; The second fastener (5) is fixedly connected to the inspection port (20) at its left end. The quick-change filter mechanism includes: The second screen replacement frame (11) is located inside the extrusion tube (1); The first screen replacement frame (7) is located inside the extrusion tube (1); Screw (3), the screw (3) is located at the center of the extrusion tube (1); The inner wall of the metal ring (15) is rotatably connected to the screw (3) through the annular groove (14).

2. The melt online screen-changing low crystal point filter extrusion screw according to claim 1, characterized in that, The inner wall of the second fastener (5) is threadedly connected to the bolt (6), and the left end of the bolt (6) passes through the first fastener (4) and extends into the interior of the second fastener (5).

3. The melt online screen-changing low crystal point filter extrusion screw according to claim 1, characterized in that, The inner wall of the extrusion tube (1) is provided with a second slot (12), the inner wall of the second slot (12) is engaged with the second screen changing frame (11), and the inner wall of the second screen changing frame (11) is fixedly connected with a second filter screen (10).

4. The melt online screen-changing low crystal point filter extrusion screw according to claim 1, characterized in that, The upper center of the second screen changing frame (11) is fixedly connected to a second semi-circular ring (18), and the inner wall of the second semi-circular ring (18) is fixedly connected to a second magnet (19). The inner wall of the second magnet (19) is magnetically connected to the outer surface of the metal ring (15). The interior of the second screen changing frame (11) is provided with a first filter screen (8).

5. The melt online screen-changing low crystal point filter extrusion screw according to claim 1, characterized in that, The outer surface of the upper end of the metal ring (15) is magnetically connected to the first magnet (17), and the outer surface of the first magnet (17) is fixedly connected to the first semi-circular ring (16), and the upper end of the first semi-circular ring (16) is fixedly connected to the first mesh frame (7).

6. The melt online screen-changing low crystal point filter extrusion screw according to claim 1, characterized in that, The outer surface of the screw (3) is fixedly connected with a cutting blade (13), and the number of cutting blades (13) is multiple and horizontally distributed.

7. The melt online screen-changing low crystal point filter extrusion screw according to claim 1, characterized in that, The top inner wall of the sealing cover (2) is provided with a first slot (9), and the inner wall of the first slot (9) is engaged with the first mesh replacement frame (7).

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