An energy-saving and emission-reducing system and method for a polypropylene filament spinning process

Abstract

The application discloses a kind of energy-saving and emission-reducing systems for polypropylene spinning process in the technical field of chemical fiber manufacturing, including machine body and the exhaust pipe of hot air discharge of spinning blow cooling link in machine body, and filter cloth is arranged at exhaust pipe by clamping mechanism, the filter cloth is used to filter hot air, further including collection mechanism, for collecting hot air after filter cloth filtering;The filter cloth is cylindrical, and winding mechanism is further provided at the exhaust pipe, and the winding mechanism is used to wind filter cloth;The clamping mechanism can release filter cloth to the direction of winding mechanism, and the winding mechanism can cooperate with clamping mechanism to switch the filter surface of filter cloth;Equipment can complete the on-line switching of filter surface, so that system always maintains low pressure drop, high filtering efficiency operation, without shutdown to replace filter cloth, ensure that spinning cooling air pressure is stable, while continuously recycling hot air waste heat, reduce subsequent setting oven energy consumption.

Description

Technical Field

[0001] This invention relates to the field of chemical fiber manufacturing technology, specifically to an energy-saving and emission-reduction system and method for polypropylene spinning process. Background Technology

[0002] In the polypropylene spinning process, there are two stages: the spinning air cooling stage and the setting oven stage. The former uses low-temperature air to quickly solidify and set the molten fine stream, forming a stable filament; the latter uses high-temperature hot air to heat-treat the filament, eliminating internal stress and improving the mechanical properties of the fiber.

[0003] The spinning cooling process generates a large amount of medium-temperature waste heat air. Traditional processes often use filtration and direct exhaust, resulting in a significant waste of heat energy and increasing thermal pollution and air conditioning load in the factory area. If this portion of the hot air is recovered and used as a preheating air source for the shaping oven, the steam / electricity consumption of the oven's heating section can be significantly reduced, achieving energy cascade utilization. However, in actual use, the collection of hot air will increase the wind resistance when filtering hot air in the cooling process. In order to maintain a low pressure drop during the filtration process and avoid excessive pressure drop that causes excessive wind pressure fluctuations in the spinning process, the equipment needs to increase the frequency of filter component replacement to reduce the wind resistance generated by the filter component and the hot air collection component as a whole. This leads to an increase in the frequency of filter component replacement and affects the normal working efficiency of the equipment. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving and emission-reduction system and method for polypropylene spinning process, 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: an energy-saving and emission-reduction system for polypropylene spinning process, comprising a machine body and an exhaust pipe for discharging hot air from the spinning blowing and cooling stage in the machine body, and a filter cloth disposed at the exhaust pipe by a clamping mechanism, wherein the filter cloth is used to filter hot air, and further comprising a collection mechanism for collecting the hot air filtered by the filter cloth; The filter cloth is cylindrical, and a winding mechanism is also provided at the exhaust pipe. The winding mechanism is used to wind up the filter cloth. The clamping mechanism can release the filter cloth towards the winding mechanism, and the winding mechanism can cooperate with the clamping mechanism to switch the filter surface of the filter cloth.

[0006] Preferably, the clamping mechanism includes a receiving shell, which is sleeved on the outer wall of the exhaust pipe. The exhaust pipe opening is fixedly connected to an expansion tube. The circumferential length of the outer wall of the expansion tube is equal to the circumferential length of the inner wall of the filter cloth. The filter cloth is folded and fitted into the receiving shell. A first clamping assembly is provided on the outer wall of the expansion tube, and a second clamping assembly is provided in the direction of the winding mechanism. The first clamping assembly is used to fix the filter cloth to the outer wall of the expansion tube, and the second clamping assembly is used to tighten the filter cloth. The filter cloth forms a bag-shaped effective filtration surface between the first clamping assembly and the second clamping assembly.

[0007] Preferably, the winding mechanism includes an adjustment component capable of elastically feeding along the axial direction of the expansion tube. The first clamping component and the second clamping component are both connected to the adjustment component. A winding machine is provided on the side of the adjustment component away from the expansion tube. The winding machine is used to wind up the filter cloth tightened by the second clamping component when the first clamping component and the second clamping component are fed towards the winding machine along with the adjustment component.

[0008] Preferably, the adjusting assembly includes a mounting rod that is elastically slidably disposed within the collecting mechanism along the axial direction of the expansion tube, and both the first clamping assembly and the second clamping assembly are fixedly disposed on the mounting rod.

[0009] Preferably, the first clamping assembly includes an mounting cylinder, which is coaxially arranged with the expansion tube and fixedly connected to the mounting rod. At least one set of pressing components is arranged axially on the inner wall of the expansion tube. The pressing components can clamp the filter cloth to the outer wall of the expansion tube by squeezing, so as to control the relative sliding between the filter cloth and the outer wall of the expansion tube.

[0010] Preferably, the pressing assembly includes a wheel frame, which is fixedly connected to the inner wall of the mounting cylinder. A friction wheel is rotatably connected to the wheel frame. The friction wheel presses against the outer wall of the expansion tube at intervals between the filter cloth and the wheel frame. The friction between the friction wheel and the filter cloth prevents the filter cloth from sliding relative to the friction wheel. The surface of the expansion tube is smooth, allowing the filter cloth in its free state to slide relative to the expansion tube. A mounting plate is slidably disposed on one side of the wheel frame along the axial direction of the expansion tube. The mounting plate has a groove. A roller is coaxially fixedly connected to the end of the friction wheel's axle. A limit block is fixedly connected to the end of the roller. The roller is slidably connected to the groove. A limit groove is formed in the depth surface of the groove. Composed of a straight groove and a circular groove, the circular groove is located at the end of the straight groove away from the winding machine and communicates with the straight groove. The limiting block can be slidably connected to the limiting groove and restricts its own rotation around the roller axis through the limiting groove. The circular groove does not restrict the rotation of the limiting block. The mounting plate is rotatably connected to a gear, and the gear is coaxially fixedly connected to a limiting wheel. One side of the limiting wheel is embedded in the sliding groove away from the winding machine and can abut against the roller. A rack is provided on the side of the mounting plate, and the rack is fixed relative to the expansion tube. The gear meshes with the rack. A cylinder is fixedly connected to the wheel frame, and the output shaft of the cylinder is drivenly connected to the mounting plate. The cylinder is used to control the displacement of the mounting plate relative to the wheel frame.

[0011] Preferably, the second clamping assembly includes a mounting platform, which is fixedly connected to the mounting rod. The upper end of the mounting platform has two symmetrically arranged clamping blocks, each of which is connected to a power component. The power component is used to drive the two clamping blocks to move towards each other, so that the two clamping blocks clamp each other tightly.

[0012] Preferably, the expansion tube is located inside the collection mechanism, and the rack is fixedly connected to the collection mechanism.

[0013] An energy-saving and emission-reduction method for polypropylene spinning process, the method is as follows: S1. The hot air generated during the polypropylene spinning and cooling process is discharged from the exhaust pipe and flows through the filter cloth on the clamping mechanism for filtration. S2. After the filter cloth has been used for a period of time, dust, oil mist and other impurities will adhere to its filter surface, which will cause the wind resistance to increase and the cooling air pressure to fluctuate. S3. At this time, the clamping mechanism releases the clogged filter cloth section towards the winding mechanism, and the winding mechanism operates synchronously to automatically send the clean cylindrical filter cloth section into the filtration station, completing the online switching of the filter surface. S4. The filtered hot air enters the collection mechanism for recycling, realizing waste heat recovery and energy conservation and emission reduction.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The clamping mechanism releases the clogged filter cloth section 3 towards the winding mechanism. The winding mechanism operates synchronously, automatically feeding the clean cylindrical filter cloth section 3 into the filtration station, completing the online switching of the filter surface. This ensures that the system always maintains low pressure drop and high filtration efficiency, eliminating the need to stop the machine to replace the filter cloth, ensuring stable spinning cooling air pressure, and continuously recovering residual heat from the hot air to reduce the energy consumption of the subsequent setting oven. As the filter cloth 3 gradually becomes clogged, the hot air pressure on the bag-shaped filter surface increases, pushing the mounting rod 8 to slide elastically along the expansion tube 5 within the collection mechanism 7, and causing the first clamping assembly and the second clamping assembly to move synchronously towards the winding machine 6. During this process, the clean filter cloth 3 inside the receiving shell 4 is automatically pulled out, forming a new filter surface, so that the system air resistance automatically returns to the normal range. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a half-sectional schematic diagram of the overall structure of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure after removing the filter cloth; Figure 4 This is a schematic diagram of the filter cloth path of the present invention; Figure 5 A schematic diagram of the structure of the adjustment component in conjunction with the expansion tube; Figure 6 Schematic diagram of the pressing assembly; Figure 7 A half-section diagram of the mounting plate of the pressing assembly; Figure 8 Schematic diagram of the mounting plate; Figure 9 A schematic diagram illustrating the operating principle of the pressing assembly in conjunction with the filter cloth of this invention; Figure 10 This is a schematic diagram of the method flow of the present invention.

[0016] The attached diagram lists the components represented by each number as follows: 1. Body; 2. Exhaust pipe; 3. Filter cloth; 4. Housing; 5. Expansion tube; 6. Winding machine; 7. Collection mechanism; 8. Mounting rod; 9. Mounting cylinder; 10. Wheel frame; 11. Friction wheel; 12. Mounting plate; 13. Slide groove; 14. Roller; 15. Limiting block; 16. Limiting groove; 161. Straight groove; 162. Circular groove; 17. Gear; 18. Limiting wheel; 19. Rack; 20. Cylinder; 21. Mounting platform; 22. Clamping block; 23. Power component. Detailed Implementation

[0017] Please see Figure 1-9The present invention provides a technical solution: an energy-saving and emission-reduction system for polypropylene spinning process, including a machine body 1 and an exhaust pipe 2 for discharging hot air in the spinning blowing and cooling stage of the machine body 1, and a filter cloth 3 set at the exhaust pipe 2 by a clamping mechanism, the filter cloth 3 being used to filter hot air, and also including a collection mechanism 7 for collecting the hot air filtered by the filter cloth 3. The filter cloth 3 is cylindrical, and a winding mechanism is also provided at the exhaust pipe 2. The winding mechanism is used to wind up the filter cloth 3. The clamping mechanism can release the filter cloth 3 towards the winding mechanism, and the winding mechanism can cooperate with the clamping mechanism to switch the filtering surface of the filter cloth 3.

[0018] The hot air generated during the polypropylene spinning and cooling process is discharged from the exhaust pipe 2, flows through the filter cloth 3 on the clamping mechanism for filtration, and the filtered hot air enters the collection mechanism 7 for recycling, realizing waste heat recovery and energy saving and emission reduction. After a period of use, dust, oil mist and other impurities will adhere to the filter cloth 3, causing the wind resistance to increase and the cooling air pressure to fluctuate. At this time, the clamping mechanism releases the blocked part of the filter cloth 3 towards the winding mechanism. The winding mechanism moves synchronously to automatically send the clean cylindrical filter cloth 3 section into the filtration station, completing the online switching of the filter surface. This ensures that the system always maintains low pressure drop and high filtration efficiency, without the need to stop the machine to replace the filter cloth, ensuring stable spinning cooling air pressure, and continuously recovering the waste heat of hot air to reduce the energy consumption of the subsequent setting oven.

[0019] Preferably, the clamping mechanism includes a receiving shell 4, which is sleeved on the outer wall of the exhaust pipe 2. The exhaust pipe 2 is fixedly connected to an expansion pipe 5. The circumferential length of the outer wall of the expansion pipe 5 is equal to the circumferential length of the inner wall of the filter cloth 3. The filter cloth 3 is folded and fitted inside the receiving shell 4. A first clamping assembly is provided on the outer wall of the expansion pipe 5, and a second clamping assembly is provided in the direction of the winding mechanism. The first clamping assembly is used to fix the filter cloth 3 to the outer wall of the expansion pipe 5, and the second clamping assembly is used to tighten the filter cloth 3. The filter cloth 3 forms a bag-shaped effective filtration surface between the first clamping assembly and the second clamping assembly.

[0020] During operation, the folded cylindrical filter cloth 3 inside the housing 4 is fixed to the outer wall of the expansion tube 5 by the first clamping assembly. The second clamping assembly tightens the filter cloth 3 towards the winding mechanism, so that the filter cloth between the two forms a bag-shaped effective filtration surface f under the action of hot air. The hot air discharged from the exhaust pipe 2 diffuses through the expansion tube 5 and evenly passes through the bag-shaped filtration surface of the filter cloth 3. Impurities are trapped on the outer surface of the filter cloth, and the filtered hot air enters the collection mechanism 7 for recycling. When the filtration surface needs to be switched, the first clamping assembly loosens the fixing of the filter cloth 3 to the expansion tube 5, while the second clamping assembly remains tightened. The clean filter cloth inside the housing 4 is released in the winding direction, and at the same time, the new filter cloth section extends along the outer wall of the expansion tube 5. After the new clean section is in place, the first clamping assembly re-fixes the filter cloth, and the second clamping assembly tightens again to form a new bag-shaped effective filtration surface, completing the filtration surface switching and ensuring the continuity of hot air filtration and recycling throughout the process.

[0021] Preferably, the winding mechanism includes an adjustment component capable of elastically feeding along the axial direction of the expansion tube 5. The first clamping component and the second clamping component are both connected to the adjustment component. A winding machine 6 is provided on the side of the adjustment component away from the expansion tube 5. The winding machine 6 is used to wind up the filter cloth 3 tightened by the second clamping component when the first clamping component and the second clamping component are fed towards the winding machine 6 along with the adjustment component.

[0022] During normal filtration, the adjusting component is in its initial elastic reset state. The first clamping component fixes the filter cloth 3 to the outer wall of the expansion tube 5, and the second clamping component tightens the filter cloth to form a bag-shaped filter surface. After the hot air is filtered stably, it enters the collection mechanism 7. When the filter cloth 3 needs to be switched, the adjusting component is elastically fed along the axis of the expansion tube 5 towards the winding machine 6, driving the first clamping component and the second clamping component to move synchronously. At this time, the first clamping component and the second clamping component maintain the clamping state of the filter cloth, and the winding machine 6 starts synchronously to wind up the blocked filter cloth section. At the same time, the clean filter cloth folded in the housing 4 is smoothly released and extends along the outer wall of the expansion tube 5 to form a new filter section. When the adjusting component is fed to the set stroke, the winding machine 6 stops winding, the first clamping component re-fixes the filter cloth, and the adjusting component is elastically reset, completing one filter surface switch. The entire process realizes stable traction, precise winding and continuous filtration of the filter cloth, ensuring stable system air resistance and uninterrupted waste heat recovery.

[0023] Preferably, the adjustment assembly includes a mounting rod 8 that is elastically slidably disposed within the collection mechanism 7 along the axial direction of the expansion tube 5, and both the first clamping assembly and the second clamping assembly are fixedly disposed on the mounting rod 8.

[0024] During operation, as the filter cloth 3 gradually becomes clogged, the hot air pressure on the bag-shaped filter surface increases, pushing the mounting rod 8 to slide elastically along the expansion tube 5 within the collection mechanism 7, and simultaneously causing the first clamping assembly and the second clamping assembly to move towards the winding machine 6. During this process, the clean filter cloth 3 inside the receiving shell 4 is automatically pulled out, forming a new filter surface, allowing the system's air resistance to automatically return to the normal range.

[0025] Preferably, the first clamping assembly includes a mounting cylinder 9, which is coaxially arranged with the expansion tube 5 and fixedly connected to the mounting rod 8. At least one set of pressing components is arranged axially on the inner wall of the expansion tube 5. The pressing components can clamp the filter cloth 3 to the outer wall of the expansion tube 5 by squeezing, so as to control the relative sliding between the filter cloth 3 and the outer wall of the expansion tube 5.

[0026] Preferably, the pressing assembly includes a wheel frame 10, which is fixedly connected to the inner wall of the mounting cylinder 9. A friction wheel 11 is rotatably connected to the wheel frame 10. The friction wheel 11 presses against the outer wall of the expansion tube 5 at intervals between the filter cloth 3 and the friction between the friction wheel 11 and the filter cloth 3, preventing the filter cloth 3 from sliding relative to the friction wheel 11. The surface of the expansion tube 5 is smooth, allowing the filter cloth 3 to slide relative to the expansion tube 5 in a free state. A mounting plate 12 is slidably disposed on one side of the wheel frame 10 along the axial direction of the expansion tube 5. The mounting plate 12 has a sliding groove 13. A roller 14 is coaxially fixedly connected to the end of the axle of the friction wheel 11. A limiting block 15 is fixedly connected to the end of the roller 14. The roller 14 is slidably connected to the sliding groove 13. A limiting groove 16 is formed in the depth surface of the sliding groove 13. The limiting groove 16 consists of a straight groove 161 and a circular groove 162. The assembly consists of 62 components. The circular groove 162 is located at the end of the straight groove 161 away from the winding machine 6 and communicates with the straight groove 161. The limiting block 15 can be slidably connected to the limiting groove 16 and is restricted from rotating axially around the roller 14 by the limiting groove 16. The circular groove 162 does not restrict the rotation of the limiting block 15. The mounting plate 12 is rotatably connected to a gear 17. The gear 17 is coaxially fixedly connected to a limiting wheel 18. One side of the limiting wheel 18 is embedded in the sliding groove 13 away from the winding machine 6 and can abut against the roller 14. A rack 19 is provided on the side of the mounting plate 12. The rack 19 is fixed relative to the expansion tube 5. The gear 17 meshes with the rack 19. The wheel frame 10 is fixedly connected to a cylinder 20. The output shaft of the cylinder 20 is drivenly connected to the mounting plate 12. The cylinder 20 is used to control the displacement of the mounting plate 12 relative to the wheel frame 10.

[0027] a. Normal filtration stage: The output shaft of cylinder 20 extends, at which time roller 14 is located in the straight groove 161 section of slide groove 13, and limit block 15 is embedded in straight groove 161, restricting friction wheel 11 from rotating around its own wheel shaft; friction wheel 11 presses against filter cloth 3, and due to the static friction between friction wheel 11 and filter cloth 3, filter cloth 3 is locked to the outer wall of expansion tube 5 and cannot slide relative to it; b. Filter cloth switching stage: When the filter cloth 3 is blocked, causing the wind resistance to increase, the mounting rod 8 drives the wheel frame 10 to move elastically towards the winding machine 6, and the output shaft of the cylinder 20 retracts freely; under the action of wind, the filter cloth 3 drives the friction wheel 11 to slide along the smooth outer wall of the expansion tube 5, and the clean filter cloth in the housing 4 is released simultaneously, and a new filter surface is gradually formed. Until the mounting rod 8 moves to its displacement limit; c. Mounting plate 12 switches to the reset state: After the mounting rod 8 moves to the displacement limit, the cylinder 20 starts and drives the mounting plate 12 to move towards the winding machine 6, so that the limiting block 15 enters the circular groove 162 from the straight groove 161, releasing the restriction on the rotation of the friction wheel 11. At this time, the roller 14 abuts against the limiting wheel 18, and the friction between the two prevents relative sliding between their surfaces. Thus, the limiting wheel 18 restricts the rotation of the friction wheel 11, causing the friction wheel 11 to rotate in the opposite direction and with the same amplitude as the limiting wheel 18. Since the gear 17, which is coaxially fixedly connected to the limiting wheel 18, meshes with the rack 19, the rotation amplitude of the friction wheel 11 is related to the gear. The travel distance of gear 17 on rack 19 is related to the transmission ratio of the transmission path from friction wheel 11 to rack 19. This makes the travel speed of gear 17 on rack 19 the same as the rotational linear velocity of friction wheel 11. That is, the travel distance of gear 17 on rack 19 is the same as the rolling distance of friction wheel 11. This ensures that when friction wheel 11 rolls on expansion tube 5, it will not slide relative to the surface of expansion tube 5. As a result, during the rolling process of friction wheel 11, filter cloth 3 will not slide relative to the surface of expansion tube 5, and friction wheel 11 can still limit the filter cloth 3 relative to the surface of expansion tube 5 during the rolling process. d. Friction wheel 11 reset: Further, under the elastic action of the mounting rod 8, the friction wheel 11 rolls away from the winding machine 6 to reset; e. Switch to normal filtration state: After the friction wheel 11 is reset in position on the expansion tube 5, the cylinder 20 is started again to move the mounting plate 12 away from the winding machine 6, so that the limiting block 15 enters the straight groove 161 from the circular groove 162 again, and the friction wheel 11 is restricted from rotating again by the limiting block 15; in this way, the system returns to normal filtration state.

[0028] Preferably, the second clamping assembly includes a mounting platform 21, which is fixedly connected to the mounting rod 8. The upper end of the mounting platform 21 has two symmetrically arranged clamping blocks 22. Each clamping block 22 is connected to a power component 23, which drives the two clamping blocks 22 to move towards each other, so that the two clamping blocks 22 clamp each other tightly.

[0029] During operation, the second clamping assembly drives the two clamping blocks 22 to clamp each other, thereby clamping and fixing the end of the filter cloth 3, so that the filter cloth 3 forms a stable bag-shaped effective filtration surface between the first clamping assembly and the second clamping assembly. When the system enters the filter cloth switching stage, the second clamping assembly maintains the clamping state of the filter cloth 3 and moves synchronously towards the winding machine 6 with the mounting rod 8, cooperating with the winding machine 6 to smoothly wind up the blocked filter cloth section. When the system enters the reset stage, the power component 23 drives the two clamping blocks 22 to slightly loosen, releasing the clamping of the filter cloth 3, so that the filter cloth 3 can slide from the two clamping blocks 22 relative to the clamping blocks 22 towards the winding machine 6.

[0030] Preferably, the expansion tube 5 is located inside the collection mechanism 7, and the rack 19 is fixedly connected to the collection mechanism 7.

[0031] An energy-saving and emission-reduction method for polypropylene spinning process, the method is as follows: S1. The hot air generated in the polypropylene spinning blowing and cooling process is discharged from the exhaust pipe 2 and flows through the filter cloth 3 on the clamping mechanism for filtration. S2. After the filter cloth 3 has been used for a period of time, dust, oil mist and other impurities will adhere to its filter surface, which will cause the wind resistance to increase and the cooling air pressure to fluctuate. S3. At this time, the clamping mechanism releases the clogged filter cloth 3 section towards the winding mechanism, and the winding mechanism operates synchronously to automatically send the clean cylindrical filter cloth 3 section into the filtration station, completing the online switching of the filter surface. S4. The filtered hot air enters the collection mechanism 7 and is recycled, realizing waste heat recovery and energy conservation and emission reduction.

Claims

1. An energy-saving and emission-reduction system for polypropylene spinning process, comprising a machine body (1) and an exhaust pipe (2) for discharging hot air from the spinning blowing and cooling stage in the machine body (1), and a filter cloth (3) disposed at the exhaust pipe (2) by a clamping mechanism, the filter cloth (3) being used to filter hot air, characterized in that: Includes a collection mechanism (7) for collecting the hot air filtered by the filter cloth (3); The filter cloth (3) is cylindrical, and a winding mechanism is also provided at the exhaust pipe (2). The winding mechanism is used to wind up the filter cloth (3). The clamping mechanism can release the filter cloth (3) towards the winding mechanism, and the winding mechanism can cooperate with the clamping mechanism to switch the filter surface of the filter cloth (3).

2. The energy-saving and emission-reduction system for polypropylene spinning process according to claim 1, characterized in that: The clamping mechanism includes a receiving shell (4), which is sleeved on the outer wall of the exhaust pipe (2). The exhaust pipe (2) is fixedly connected to an expansion pipe (5). The circumferential length of the outer wall of the expansion pipe (5) is equal to the circumferential length of the inner wall of the filter cloth (3). The filter cloth (3) is folded and fitted inside the receiving shell (4). A first clamping assembly is provided on the outer wall of the expansion pipe (5). A second clamping assembly is provided in the direction of the winding mechanism. The first clamping assembly is used to fix the filter cloth (3) to the outer wall of the expansion pipe (5). The second clamping assembly is used to tighten the filter cloth (3). The filter cloth (3) forms a bag-shaped effective filter surface between the first clamping assembly and the second clamping assembly.

3. The energy-saving and emission-reduction system for polypropylene spinning process according to claim 2, characterized in that: The winding mechanism includes an adjustment component capable of elastically feeding along the axial direction of the expansion tube (5). The first clamping component and the second clamping component are both connected to the adjustment component. A winding machine (6) is provided on the side of the adjustment component away from the expansion tube (5). The winding machine (6) is used to wind up the filter cloth (3) tightened by the second clamping component when the first clamping component and the second clamping component are fed towards the winding machine (6) along with the adjustment component.

4. The energy-saving and emission-reduction system for polypropylene spinning process according to claim 3, characterized in that: The adjustment assembly includes an installation rod (8) that is elastically slidably disposed in the collection mechanism (7) along the axial direction of the expansion tube (5), and the first clamping assembly and the second clamping assembly are both fixedly disposed on the installation rod (8).

5. The energy-saving and emission-reduction system for polypropylene spinning process according to claim 4, characterized in that: The first clamping assembly includes an mounting cylinder (9), which is coaxially arranged with the expansion tube (5) and fixedly connected to the mounting rod (8). The inner wall of the expansion tube (5) is provided with at least one set of pressing components along the axial direction. The pressing components can clamp the filter cloth (3) to the outer wall of the expansion tube (5) by squeezing, so as to control the relative sliding between the filter cloth (3) and the outer wall of the expansion tube (5).

6. The energy-saving and emission-reduction system for polypropylene spinning process according to claim 5, characterized in that: The pressing assembly includes a wheel frame (10), which is fixedly connected to the inner wall of the mounting cylinder (9). A friction wheel (11) is rotatably connected to the wheel frame (10). The friction wheel (11) presses against the outer wall of the expansion tube (5) at intervals between the filter cloth (3). The friction between the friction wheel (11) and the filter cloth (3) prevents the filter cloth (3) from sliding relative to the friction wheel (11). The expansion tube (5) has a smooth surface, allowing the filter cloth (3) to slide relative to the expansion tube (5) in a free state. A mounting plate (12) is slidably disposed on one side of the frame (10) along the axial direction of the expansion tube (5). The mounting plate (12) has a sliding groove (13). A roller (14) is coaxially fixedly connected to the end of the axle of the friction wheel (11). A limit block (15) is fixedly connected to the end of the roller (14). The roller (14) is slidably connected to the sliding groove (13). A limit groove (16) is formed on the groove depth surface of the sliding groove (13). The limit groove (16) consists of a straight groove (161) and a circular groove (162). The components are as follows: the circular groove (162) is located at the end of the straight groove (161) away from the winding machine (6) and communicates with the straight groove (161); the limiting block (15) can be slidably connected to the limiting groove (16) and restricts its own axial rotation around the roller (14) through the limiting groove (16); the circular groove (162) does not restrict the rotation of the limiting block (15); the mounting plate (12) is rotatably connected to a gear (17); the gear (17) is coaxially fixedly connected to a limiting wheel (18); the limiting wheel (18) The mounting plate (12) is embedded in a groove (13) on one side, away from the winding machine (6) and able to abut against the roller (14). A rack (19) is provided on the side of the mounting plate (12). The rack (19) is fixed relative to the expansion tube (5). The gear (17) meshes with the rack (19). A cylinder (20) is fixedly connected to the wheel frame (10). The output shaft of the cylinder (20) is connected to the mounting plate (12) for transmission. The cylinder (20) is used to control the displacement of the mounting plate (12) relative to the wheel frame (10).

7. The energy-saving and emission-reduction system for polypropylene spinning process according to claim 6, characterized in that: The second clamping assembly includes a mounting platform (21), which is fixedly connected to the mounting rod (8). The upper end of the mounting platform (21) has two symmetrically arranged clamping blocks (22). Each clamping block (22) is connected to a power component (23). The power component (23) is used to drive the two clamping blocks (22) to move towards each other, so that the two clamping blocks (22) hug each other tightly.

8. The energy-saving and emission-reduction system for polypropylene spinning process according to claim 6, characterized in that: The expansion tube (5) is located inside the collection mechanism (7), and the rack (19) is fixedly connected to the collection mechanism (7).

9. An energy-saving and emission-reduction method for polypropylene spinning process, applicable to any of the energy-saving and emission-reduction systems for polypropylene spinning process described in claims 1-8, characterized in that: The method is as follows: S1. The hot air generated in the polypropylene spinning blowing and cooling process is discharged from the exhaust pipe (2) and flows through the filter cloth (3) on the clamping mechanism for filtration; S2. After the filter cloth (3) has been used for a period of time, dust, oil mist and other impurities will adhere to its filter surface, resulting in increased wind resistance and fluctuations in cooling air pressure. S3. At this time, the clamping mechanism releases the blocked filter cloth (3) part towards the winding mechanism, and the winding mechanism moves synchronously to automatically send the clean cylindrical filter cloth (3) section into the filtration station to complete the online switching of the filter surface. S4. The filtered hot air enters the collection mechanism (7) and is recycled to realize waste heat recovery and energy saving and emission reduction.

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