Extrusion equipment and method for producing anti-static protective clothing fibers from recycled polyester plastic

Abstract

The application relates to the technical field of plastic extrusion, in particular to an extrusion equipment for producing anti-static protective clothing fibers from recycled polyester plastics and an extrusion method thereof, which comprises a machine table, a protective cover plate connected to the machine table, an extrusion cooling assembly arranged in the protective cover plate, a filter box connected to the machine table, a conveying pipe connected to the extrusion cooling assembly and arranged on the filter box, a cleaning box connected to the top of the filter box, a filter switching mechanism arranged on the filter box and connected to the cleaning box, filter screens symmetrically arranged on the filter switching mechanism and slidably connected to the filter box, and a follow-up plugging mechanism arranged in the filter box and connected to the filter switching mechanism. The filter switching mechanism and the follow-up plugging mechanism are matched, so that the filter screens can be cleaned alternately.

Description

Technical Field

[0001] This invention relates to the field of plastic extrusion technology, specifically to an extrusion device and method for recycling polyester plastics to produce antistatic protective clothing fibers. Background Technology

[0002] In the melt extrusion process of recycled polyester plastics, the raw materials are often mixed with non-meltable non-plastic impurities, such as labels, adhesives, metal scraps, and unmelted crystals. If these impurities remain in the melt, they will cause filament breakage, fuzz, or even block the spinneret in the subsequent spinning process, which will seriously affect the quality of the fiber and the production efficiency. Therefore, setting up a filtration device in the extrusion system to remove impurities from the melt is a key step to ensure spinning quality and continuous production.

[0003] In existing technologies, single-mesh filters are typically used. When the melt flows through the filter, impurities are intercepted. However, as the filtration volume increases, the filter becomes clogged and must be replaced, leading to production interruptions. To address this, a dual-station hydraulic screen changer can be used to achieve online switching and cleaning of the filter. However, during the switching process, if the timing control malfunctions, both filters may be in the working position simultaneously or both may be closed, causing obstructed melt flow and a sudden pressure surge; or a momentary unfiltered short-circuit state may occur, allowing unfiltered melt to directly enter the spinning process, resulting in impurity contamination. Summary of the Invention

[0004] The purpose of this invention is to provide an extrusion device and method for recycling polyester plastics to produce antistatic protective clothing fibers, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An extrusion apparatus for recycling polyester plastics to produce antistatic protective clothing fibers includes:

[0007] The machine base and the protective cover plate connected to the machine base, with an extrusion cooling assembly installed inside the protective cover plate;

[0008] Also includes:

[0009] A filter box is connected to the machine base, and a conveying pipe connected to the extrusion cooling assembly is installed on the filter box. A cleaning box is connected to the top of the filter box.

[0010] A filter switching mechanism is provided on the filter box and connected to the cleaning box. The filter switching mechanism is connected to filter screens that are symmetrically distributed and slidably connected to the filter box. The filter switching mechanism can control the two filter screens to be alternately placed in the filter box and the cleaning box.

[0011] A follow-up blocking mechanism is disposed inside the filter box and connected to the filter switching mechanism. The follow-up blocking mechanism can operate when the filter switching mechanism moves to adjust the conduction state of the filter box.

[0012] As a further aspect of the present invention: the extrusion cooling assembly includes a feeding pipe connected inside the protective cover plate, a feeding hopper connected to the feeding pipe, a first motor connected to the machine base, and a screw connected to the output shaft of the first motor rotatably installed inside the feeding pipe.

[0013] As a further embodiment of the present invention: the extrusion cooling assembly further includes a cooling box installed on the machine base and connected to the feed pipe, and conveying pipes connected to the filter box are symmetrically installed on the cooling box.

[0014] As a further embodiment of the present invention: the filter switching mechanism includes a cylinder mounted on the machine base, a push plate connected to the telescopic end of the cylinder, and a follower rod slidably mounted on the push plate.

[0015] As a further embodiment of the present invention: the filter switching mechanism further includes a movable plate connected to the follower rod, the movable plate having symmetrically distributed guide grooves, a movable rod penetrating the filter box installed on the filter screen, and a limiting post connected to the end of the movable rod that slidably engages with the guide groove.

[0016] As a further embodiment of the present invention: the guide groove includes a first straight groove, a first inclined groove, a second straight groove, and a second inclined groove formed on the movable plate. The two ends of the first inclined groove are respectively connected to the ends of the first straight groove and the second straight groove. One end of the second inclined groove is connected to the end of the second straight groove, and the other end is connected to the first straight groove.

[0017] As a further embodiment of the present invention: the follow-up sealing mechanism includes a partition installed in the filter box and the cleaning box, a sealing plate that penetrates the partition is slidably installed in the filter box, and guide columns that are symmetrically distributed and penetrate the filter box are connected to the side wall of the sealing plate. An elastic component connected to the follow-up rod is provided on the guide column.

[0018] As a further embodiment of the present invention: the elastic component includes a support plate connected to the end of the guide post, an extension rod connected to the support plate, a connecting plate slidably connected to the end of the follower rod, a spring sleeved on the extension rod, and the two ends of the spring abutting against the connecting plate and the support plate respectively.

[0019] An extrusion method for producing antistatic protective clothing fibers from recycled polyester plastics includes the following steps:

[0020] Step 1: The raw material is heated, melted, and cooled by the extrusion cooling assembly, and then conveyed into the filter box;

[0021] Step 2: Under the action of the filter switching mechanism, one filter screen is located in the filter box and the other filter screen is located in the cleaning box;

[0022] Step 3: Under the action of the follow-up sealing mechanism, the side of the cleaning box without a filter screen is sealed, and the raw material is squeezed out after being filtered through the filter screen on one side.

[0023] Step 4: When the filtration efficiency decreases, the filter switching mechanism controls the two filter screens to switch positions and simultaneously adjusts the blocking status of the follow-up blocking mechanism.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This invention precisely controls the movement sequence of the left and right filter screens through the cooperation of the guide groove and the limiting post. In the initial stage of switching, the filter screen to be cleaned on the right side first quickly enters the right filter chamber from the cleaning box, forming a co-position state in which both screens work simultaneously. Then, the follow-up sealing mechanism closes the original working side filter chamber under the drive of the spring force difference. Finally, the original working side filter screen exits and enters the cleaning box. In this way, it is ensured that at least one filter screen is always in an effective working position during the entire switching process, avoiding the short-circuit risk of the melt being discharged directly without effective filtration at the moment of switching, and ensuring the purity of the product and the continuity of filtration.

[0026] When the movable plate moves, the follower rod drives the connecting plate to move synchronously, changing the compression of the springs on both sides. By using the difference in spring force, the timing of the sealing plate's movement is controlled. When the right-side filter is in place and has been put into operation, the right-side spring force exceeds that on the left, and the sealing plate automatically moves to the left to seal the left-side chamber, thus achieving the timing coordination between filter switching and flow channel sealing.

[0027] After the switch is completed, the filter screen to be cleaned in the cleaning box is cleaned by the cleaning wheel and the air supply duct working together. The knocking or scraping of the cleaning wheel causes large pieces of impurities to fall off, and the reverse air blowing blows away the fine dust attached to the filter screen pores. Attached Figure Description

[0028] Figure 1 A schematic diagram of one embodiment of an extrusion equipment for recycling polyester plastics to produce antistatic protective clothing fibers.

[0029] Figure 2 A schematic diagram of the structure of an extrusion equipment for producing antistatic protective clothing fibers from recycled polyester plastics, taken from another angle.

[0030] Figure 3A top view schematic diagram of an extrusion equipment for producing antistatic protective clothing fibers from recycled polyester plastics.

[0031] Figure 4 A schematic cross-sectional view of the filter box and cleaning box in one embodiment of an extrusion equipment for recycling polyester plastic to produce antistatic protective clothing fibers.

[0032] Figure 5 A schematic diagram showing the connection relationship between the follow-up sealing mechanism and the filter switching mechanism in one embodiment of an extrusion equipment for recycling polyester plastic to produce antistatic protective clothing fibers.

[0033] Figure 6 for Figure 5 A magnified schematic diagram of the structure at point A in the middle.

[0034] Figure 7 A schematic diagram of the follow-up sealing mechanism in one embodiment of an extrusion equipment for recycling polyester plastic to produce antistatic protective clothing fibers.

[0035] Figure 8 A schematic diagram of a partial filtration switching mechanism in one embodiment of an extrusion equipment for recycling polyester plastics to produce antistatic protective clothing fibers.

[0036] Figure 9 An exploded view of part of the filter switching mechanism in one embodiment of an extrusion equipment for recycling polyester plastic to produce antistatic protective clothing fibers.

[0037] In the diagram: 1. Machine base; 2. Protective cover plate; 3. Feeding pipe; 301. Feed hopper; 4. First motor; 5. Screw; 6. Cooling box; 7. Conveying pipe; 8. Filter box; 801. Partition plate; 9. Cleaning box; 901. Air supply pipe; 10. Filter screen; 11. Movable rod; 12. Limiting post; 13. Second motor; 14. Transmission rod; 15. Cleaning wheel; 16. Movable plate; 1601. First straight groove; 1602. First inclined groove; 1603. Second straight groove; 1604. Second inclined groove; 17. Cylinder; 18. Push plate; 19. Follower rod; 20. Connecting plate; 21. Sealing plate; 22. Guide post; 23. Support plate; 24. Spring; 25. Extrusion pipe; 26. Extension rod. Detailed Implementation

[0038] 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.

[0039] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0040] Please see Figures 1-9 In this embodiment of the invention, an extrusion device for recycling polyester plastic to produce antistatic protective clothing fibers includes:

[0041] Machine base 1, and protective cover plate 2 connected to machine base 1, with an extrusion cooling assembly installed inside the protective cover plate 2;

[0042] Also includes:

[0043] A filter box 8 is connected to the machine base 1. A conveying pipe 7 connected to the extrusion cooling assembly is installed on the filter box 8. A cleaning box 9 is connected to the top of the filter box 8.

[0044] A filter switching mechanism is provided on the filter box 8 and connected to the cleaning box 9. The filter switching mechanism is connected to filter screens 10 that are symmetrically distributed and slidably connected to the filter box 8. The filter switching mechanism can control the two filter screens 10 to be alternately placed in the filter box 8 and the cleaning box 9.

[0045] A follow-up blocking mechanism is installed inside the filter box 8 and connected to the filter switching mechanism. The follow-up blocking mechanism can operate when the filter switching mechanism moves to adjust the conduction state of the filter box 8.

[0046] Specifically, during the melt extrusion of plastics, to ensure the quality of antistatic protective clothing, the molten raw material needs to be filtered to remove some non-molten, non-plastic impurities. To this end, when the raw material is added to the extrusion cooling assembly, it is heated, melted, and cooled. Subsequently, it is conveyed to the filter box 8. Under the action of the filter switching mechanism, one filter screen 10 is located in the filter box 8, and the other filter screen 10 is located in the cleaning box 9, meaning the two filter screens 10 are in working and cleaning states respectively. Simultaneously, under the action of the follow-up sealing mechanism, the non-working position of the filter box 8 is sealed to ensure that the raw material can only be extruded after being filtered through the filter screen 10. As filtration proceeds, impurities on the filter screen 10 gradually increase, leading to a decrease in filtration efficiency. Therefore, under the action of the filter switching mechanism, the working state of the two filter screens 10 is switched, and the movement of the follow-up sealing mechanism is controlled to synchronously adjust the sealing position of the filter box 8. In this way, it can be ensured that the raw material is always filtered, and the filter screen 10 can also be cleaned online.

[0047] Please see Figures 1-3 The extrusion cooling assembly includes a feeding pipe 3 connected inside the protective cover plate 2, a feeding hopper 301 connected to the feeding pipe 3, a first motor 4 connected to the machine base 1, and a screw 5 rotatably installed inside the feeding pipe 3 and connected to the output shaft of the first motor 4. The extrusion cooling assembly also includes a cooling box 6 installed on the machine base 1 and communicating with the feeding pipe 3, and conveying pipes 7 symmetrically installed on the cooling box 6 and communicating with the filter box 8.

[0048] In detail, when it is necessary to melt-extrude recycled polyester plastic, the raw material can be added into the feeding pipe 3 through the feed hopper 301. Then, the first motor 4 is started, and the first motor 4 drives the screw 5 to rotate, thereby guiding the raw material to move along the axial direction of the feeding pipe 3 and heating and melting the raw material. The molten material will be separated from the feeding pipe 3 and transported to the cooling box 6. Under the action of the cooling box 6, the raw material is initially cooled. After cooling is completed, the raw material will be transported to the filter box 8 through the conveying pipe 7 for subsequent filtration.

[0049] Please see Figures 4-6 , Figure 8 , Figure 9The filter switching mechanism includes a cylinder 17 mounted on the machine base 1. A push plate 18 is connected to the telescopic end of the cylinder 17. A follower rod 19 is slidably mounted on the push plate 18. The filter switching mechanism also includes a movable plate 16 connected to the follower rod 19. A guide groove is formed on the movable plate 16 in a symmetrically distributed manner. A movable rod 11 that penetrates the filter box 8 is mounted on the filter screen 10. A limiting post 12 that slides into the guide groove is connected to the end of the movable rod 11. The guide groove includes a first straight groove 1601, a first inclined groove 1602, a second straight groove 1603, and a second inclined groove 1604 formed on the movable plate 16. The two ends of the first inclined groove 1602 are respectively connected to the ends of the first straight groove 1601 and the second straight groove 1603. One end of the second inclined groove 1604 is connected to the end of the second straight groove 1603, and the other end is connected to the first straight groove 1601.

[0050] Please see Figure 4 , Figure 5 , Figure 7 The follow-up sealing mechanism includes a partition 801 installed in the filter box 8 and the cleaning box 9. A sealing plate 21 that penetrates the partition 801 is slidably installed in the filter box 8. The side wall of the sealing plate 21 is connected to guide posts 22 that are symmetrically distributed and penetrate the filter box 8. An elastic component connected to the follow-up rod 19 is provided on the guide post 22. The elastic component includes a support plate 23 connected to the end of the guide post 22. An extension rod 26 is connected to the support plate 23. The end of the follow-up rod 19 is connected to a connecting plate 20 that is slidably connected to the extension rod 26. A spring 24 is sleeved on the extension rod 26. The two ends of the spring 24 abut against the connecting plate 20 and the support plate 23, respectively.

[0051] Furthermore, a second motor 13 is installed on the side wall of the cleaning box 9, and a transmission rod 14 connected to the output shaft of the second motor 13 is rotatably installed on the cleaning box 9. A cleaning wheel 15 is connected to the transmission rod 14. An air supply pipe 901 is also connected to the cleaning box 9. The air supply pipe 901 can supply air from the back of the filter screen 10, and under the action of the air force, the impurities attached to the filter screen 10 are blown away. An extrusion pipe 25 is connected to the filter box 8. After the product is filtered, it can be extruded through the extrusion pipe 25.

[0052] Please see Figure 4 ,by Figure 4The filter screen 10 is in the initial state. Under the action of the partition 801, the filter box 8 is divided into two cavities. The cylinder 17 extends to the minimum. Under the action of the cylinder 17, the movable plate 16 is controlled to be at the end of the stroke on the right side by the push plate 18 and the follower rod 19. In this state, one of the limiting posts 12 is located at the end of the stroke on the side of the first straight groove 1601 away from the first inclined groove 1602. Under the action of the first straight groove 1601 and the limiting post 12, the filter screen 10 on the left side is controlled to be in one of the filter chambers of the filter box 8 by the movable rod 11. The filter screen 10 is in the working state.

[0053] Another limiting post 12 is located at the connection position between the first inclined groove 1602 and the second straight groove 1603. Under the action of the first inclined groove 1602 and the limiting post 12, the filter screen 10 on the right side is controlled by the movable rod 11 to be located in the cleaning box 9, and the filter screen 10 is in a state to be cleaned.

[0054] The sealing plate 21 is located on the same side of the movable plate 16 and abuts against the inner wall of the filter box 8. Under the action of the sealing plate 21, the other filter chamber is sealed. In this state, the follower rod 19 controls the distance between the connecting plate 20 on the left and the support plate 23 on the left to be the smallest, so that the compression of the left spring 24 is the largest, while the distance between the connecting plate 20 on the right and the support plate 23 on the right is the largest, so that the compression of the right spring 24 is the smallest. Under the action of the spring 24, the sealing plate 21 is always pushed towards the right.

[0055] When it is necessary to filter the molten product, the product in the cooling box 6 is conveyed to the filter box 8 through the conveying pipe 7. Since the left filter chamber is in a conductive state and the right filter chamber is in a blocked state, the product is filtered through the left filter screen 10 and then extruded through the extrusion pipe 25 to complete the filtration operation.

[0056] As the filtration process continues, the impurities attached to the left filter screen 10 gradually increase, leading to a decrease in filtration efficiency. The filter screen 10 needs to be cleaned. At this time, the cylinder 17 operates, pushing the follower rod 19 to the left via the push plate 18, thereby causing the movable plate 16 to move synchronously. Under the action of the movable plate 16, the left limiting post 12 slides relative to the movable plate 16 along the first straight groove 1601, and the right limiting post 12 slides relative to the movable plate 16 along the second straight groove 1603. Since the length of the second straight groove 1603 is much smaller than the first straight groove 1601, the right limiting post 12 quickly disengages from the second straight groove 1603 and enters the second inclined groove 1604. Under the combined action of the right limiting post 12 and the second inclined groove 1604, the movable rod 11 drives the right filter screen 10 located in the cleaning box 9 to move downwards and enter the right filter chamber. Simultaneously, the follower rod 19 drives the connecting plate 20 to move to the left, causing the left spring 24 to release its elastic potential energy, and the right spring 24 to be compressed.

[0057] When the right limiting post 12 disengages from the second inclined groove 1604 and enters the first straight groove 1601, the left limiting post 12 still slides in the first straight groove 1601, and the position of the left filter screen 10 remains unchanged. At this time, both filter screens 10 are in the working position and are in the left and right filter chambers respectively. In this state, the elastic potential energy of the right spring 24 exceeds the elastic potential energy of the left spring 24, and pushes the sealing plate 21 to move to the left through the support plate 23 and the guide post 22. When the sealing plate 21 moves to abut against the inner wall of the left filter box 8, the left filter chamber is completely blocked, and the product can no longer pass through the left channel. At this time, the left limiting post 12 just moves to the connection position between the first straight groove 1601 and the first inclined groove 1602.

[0058] The movable plate 16 continues to move, further compressing the right spring 24 through the connecting plate 20, while the left spring 24 continues to release elastic potential energy. At the same time, the left limiting post 12 enters the first inclined groove 1602, and controls the left filter screen 10 to move towards the cleaning box 9 through the movable rod 11. When the left limiting post 12 moves to the position where the first inclined groove 1602 and the second straight groove 1603 are connected, the left filter screen 10 completely detaches from the filter box 8 and enters the cleaning box 9. The right limiting post 12 is located at the end of the stroke of the first straight groove 1601 on the side away from the first inclined groove 1602, and the right filter screen 10 remains in the working position to continuously filter the product.

[0059] In this way, it can be ensured that during the state switching process, both filters 10 are in the working position first, so as to prevent the product from being filtered and discharged when the blocking plate 21 moves. Only when the blocking plate 21 moves to the corresponding blocking position will the filter 10 that needs to be cleaned leave the filter box 8 and enter the cleaning box 9, thereby further ensuring that the product is fully filtered.

[0060] After the switching is completed, the second motor 13 starts working and controls the cleaning wheel 15 to rotate through the transmission rod 14. The cleaning wheel 15 knocks or scrapes the left filter screen 10 in the cleaning box 9, causing the impurities attached to the surface of the filter screen 10 to separate from the filter screen 10. At the same time, the air duct 901 blows air towards the back of the filter screen 10. Under the action of the reverse airflow, the impurities are further blown away from the filter screen 10. The cleaned impurities fall into the bottom of the cleaning box 9 and can be cleaned periodically.

[0061] An extrusion method for producing antistatic protective clothing fibers from recycled polyester plastics includes the following steps:

[0062] Step 1: The raw material is heated, melted, and cooled by the extrusion cooling assembly, and then conveyed into the filter box 8;

[0063] Step 2: Under the action of the filter switching mechanism, one filter screen 10 is located in the filter box 8, and the other filter screen 10 is located in the cleaning box 9;

[0064] Step 3: Under the action of the follow-up sealing mechanism, the side of the cleaning box without filter screen 10 is sealed, and the raw material is squeezed out after being filtered by filter screen 10 on one side.

[0065] Step 4: When the filtration efficiency decreases, the filter switching mechanism controls the two filter screens 10 to switch positions and simultaneously adjusts the blocking status of the follow-up blocking mechanism.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0067] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An extrusion apparatus for recycling polyester plastics to produce antistatic protective clothing fibers, comprising: The machine base and the protective cover plate connected to the machine base, with an extrusion cooling assembly installed inside the protective cover plate; Its characteristic is that it further includes: A filter box is connected to the machine base, and a conveying pipe connected to the extrusion cooling assembly is installed on the filter box. A cleaning box is connected to the top of the filter box. A filter switching mechanism is provided on the filter box and connected to the cleaning box. The filter switching mechanism is connected to filter screens that are symmetrically distributed and slidably connected to the filter box. The filter switching mechanism can control the two filter screens to be alternately placed in the filter box and the cleaning box. A follow-up blocking mechanism is disposed inside the filter box and connected to the filter switching mechanism. The follow-up blocking mechanism can operate when the filter switching mechanism moves to adjust the conduction state of the filter box.

2. The extrusion equipment for recycling polyester plastics to produce antistatic protective clothing fibers according to claim 1, characterized in that, The extrusion cooling assembly includes a feeding pipe connected inside the protective cover plate, a feeding hopper connected to the feeding pipe, a first motor connected to the machine base, and a screw connected to the output shaft of the first motor rotatably installed inside the feeding pipe.

3. The extrusion equipment for recycling polyester plastics to produce antistatic protective clothing fibers according to claim 2, characterized in that, The extrusion cooling assembly also includes a cooling box installed on the machine base and connected to the feed pipe, and conveying pipes connected to the filter box are symmetrically installed on the cooling box.

4. The extrusion equipment for recycling polyester plastics to produce antistatic protective clothing fibers according to claim 1, characterized in that, The filter switching mechanism includes a cylinder mounted on the machine base, a push plate connected to the telescopic end of the cylinder, and a follower rod slidably mounted on the push plate.

5. An extrusion apparatus for recycling polyester plastics to produce antistatic protective clothing fibers according to claim 4, characterized in that, The filter switching mechanism also includes a movable plate connected to the follower rod. The movable plate has symmetrically distributed guide grooves. A movable rod that passes through the filter box is installed on the filter screen. The end of the movable rod is connected to a limiting post that slides and engages with the guide groove.

6. The extrusion equipment for producing antistatic protective clothing fibers from recycled polyester plastics according to claim 5, characterized in that, The guide groove includes a first straight groove, a first inclined groove, a second straight groove, and a second inclined groove formed on the movable plate. The two ends of the first inclined groove are respectively connected to the ends of the first straight groove and the second straight groove. One end of the second inclined groove is connected to the end of the second straight groove, and the other end is connected to the first straight groove.

7. The extrusion equipment for recycling polyester plastics to produce antistatic protective clothing fibers according to claim 4, characterized in that, The follow-up sealing mechanism includes a partition installed in the filter box and the cleaning box. A sealing plate that penetrates the partition is slidably installed in the filter box. The side wall of the sealing plate is connected to guide columns that are symmetrically distributed and penetrate the filter box. An elastic component connected to the follow-up rod is provided on the guide column.

8. An extrusion apparatus for recycling polyester plastics to produce antistatic protective clothing fibers according to claim 7, characterized in that, The elastic component includes a support plate connected to the end of the guide post, an extension rod connected to the support plate, a connecting plate slidably connected to the end of the follower rod, and a spring sleeved on the extension rod, with both ends of the spring abutting against the connecting plate and the support plate respectively.

9. An extrusion method for producing antistatic protective clothing fibers from recycled polyester plastics, using the extrusion equipment for producing antistatic protective clothing fibers from recycled polyester plastics as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: The raw material is heated, melted, and cooled by the extrusion cooling assembly, and then conveyed into the filter box; Step 2: Under the action of the filter switching mechanism, one filter screen is located in the filter box and the other filter screen is located in the cleaning box; Step 3: Under the action of the follow-up sealing mechanism, the side of the cleaning box without a filter screen is sealed, and the raw material is squeezed out after being filtered through the filter screen on one side. Step 4: When the filtration efficiency decreases, the filter switching mechanism controls the two filter screens to switch positions and simultaneously adjusts the blocking status of the follow-up blocking mechanism.

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