High-shrinkage polyester fiber and preparation device thereof

Abstract

The invention relates to the technical field of polyester fibers, in particular to a high-shrinkage polyester fiber and a preparation device.The high-shrinkage polyester fiber is prepared from conventional polyester chips with the intrinsic viscosity of 0.6-0.8 dL / g. The preparation device comprises a double-screw extrusion rod and a mounting shell. A first cooling cylinder corresponding to the position of the spinneret plate is arranged in the mounting shell, a preheating assembly is arranged on the side, away from the spinneret plate, of the first cooling cylinder, and the preheating assembly comprises a second cooling cylinder, a third cooling cylinder and a fourth cooling cylinder which are rotationally connected into the mounting shell. The U-shaped wind shield is arranged to guide airflow to form an acceleration effect on the two sides of fibers, the cooling efficiency is remarkably improved, fiber damage caused by direct impact of the airflow is avoided, the product quality and the production stability are ensured, meanwhile, the third cooling cylinder and the fourth cooling cylinder are adopted for graded preheating, the fibers are in the best high-elastic state, and the production efficiency is improved. And the wire breaking risk of the subsequent stretching process is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of polyester fibers, and particularly to a high-shrinkage polyester fiber and a preparation device thereof. Background Art

[0002] High-shrinkage polyester fiber is a polyester (PET) fiber with special modification, and its boiling water shrinkage rate is significantly higher than that of conventional polyester fibers. This kind of fiber will shrink significantly when heated (such as boiling water or hot air), thus endowing the fabric with unique properties, such as fluffiness and softness. The physical modification method mainly realizes high shrinkage by adjusting the processing technology of the fiber (without changing the chemical composition). The high-shrinkage polyester fiber prepared by physical modification has important value in the fields of textile, packaging, etc.

[0003] At present, when cooling polyester fibers in the prior art, the cooling method is single and the distribution of the cooling air flow is unreasonable, and the heat in the middle area of the fiber cannot be quickly and effectively taken away, resulting in slow cooling of the cold fiber and the molecular chain cannot be quickly shaped. At the same time, the air flow of the traditional cooling device directly impacts the fiber, and the wind force is not reasonably controlled and guided. There is a situation where the polyester fiber shakes or breaks due to excessive wind force during cooling, affecting the quality of the fiber and the stability of production. During the cooling process, uneven internal stress is easily generated inside the fiber, making the fiber prone to filament breakage during the subsequent stretching process, thus affecting the continuity of production and the product quality. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem of poor cooling effect of polyester fibers in the prior art resulting in a decline in product quality, and to propose a high-shrinkage polyester fiber and a preparation device thereof.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme: A high-shrinkage polyester fiber, the high-shrinkage polyester fiber is made of conventional polyester chips with an intrinsic viscosity of 0.6 - 0.8 dL / g, and high shrinkage is achieved by the physical modification method. The shrinkage rate of the high-shrinkage polyester fiber under boiling water treatment conditions is 35% - 45%.

[0006] A high-shrinkage polyester fiber preparation device, which is used to produce the above-mentioned high-shrinkage polyester fiber, includes a double-screw extruder and an installation housing. The extrusion end of the double-screw extruder penetrates into the installation housing and is fixedly connected with a spinneret plate. A first cooling cylinder corresponding to the position of the spinneret plate is arranged in the installation housing. A preheating assembly is arranged on the side of the first cooling cylinder away from the spinneret plate. The preheating assembly includes a second cooling cylinder, a third cooling cylinder and a fourth cooling cylinder rotatably connected in the installation housing. Two blow air pipes with opposite inclination directions are fixedly communicated with the outer walls of each cooling cylinder. A wind shielding assembly is arranged in the middle of the first cooling cylinder, the second cooling cylinder and the third cooling cylinder. The windshield assembly is composed of two U-shaped windshield plates symmetrically distributed up and down and two first window screens symmetrically distributed left and right. The U-shaped windshield plates are fixedly connected to the first window screens, and both the U-shaped windshield plates and the first window screens are fixedly connected to the inner wall of the cooling cylinder. A second window screen is fixedly installed on the U-shaped windshield plate, and the two second window screens respectively correspond to the positions of two air blowing pipes in the corresponding cooling cylinders. The mesh densities of the first window screens and the second window screens in the second cooling cylinder are both lower than those of the corresponding first window screens and second window screens in the first cooling cylinder. A stretching mechanism is arranged at one end of the preheating assembly away from the spinneret, and a winding assembly is arranged above the stretching mechanism.

[0007] Preferably, a support plate is fixedly installed inside the installation housing. The first cooling cylinder is rotatably connected to the support plate. The third cooling cylinder is located between the second cooling cylinder and the fourth cooling cylinder. An airtight cavity communicated with the air blowing pipe is arranged on the outer wall of each cooling cylinder. The airtight cavity is composed of a fixed housing and a sliding plate. The fixed housing is fixedly installed on the outer wall of the cooling cylinder. The fixed housing is rotatably connected to the sliding plate. The sliding plate is fixedly connected with an air inlet pipe communicated with the cavity. A first air cooler, a second air cooler, a first hot air blower and a second hot air blower are fixedly installed on the outer wall of the installation housing. The air inlet pipes on the first cooling cylinder, the second cooling cylinder, the third cooling cylinder and the fourth cooling cylinder are respectively fixedly communicated with the first air cooler, the second air cooler, the first hot air blower and the second hot air blower. A third hot air blower, a fourth hot air blower and a fifth hot air blower are fixedly installed on the outer wall of the installation housing. The installation heights of the second hot air blower, the third hot air blower, the fifth hot air blower and the fourth hot air blower increase sequentially in the vertical direction.

[0008] Preferably, an external toothed ring is fixedly installed on the outer wall of each cooling cylinder. Two groups of driving components are arranged inside the installation housing, and the two groups of driving components respectively correspond to the positions of the first cooling cylinder and the preheating assembly. The driving component includes a second motor fixedly installed inside the installation housing. The output end of the second motor is fixedly connected with a rotating shaft. A plurality of gears are fixedly installed on the outer wall of the rotating shaft, and the gears are meshed with the external toothed rings of the corresponding cooling cylinders.

[0009] Preferably, a conveyor belt is fixedly installed inside the installation housing. The conveyor belt penetrates through the second cooling cylinder, the third cooling cylinder and the fourth cooling cylinder. A first clamping device is arranged inside the installation housing. The feeding end of the conveyor belt corresponds to the position of the first cooling cylinder, and the discharging end corresponds to the position of the first clamping device. A limiting roller is rotatably connected to the inner wall of the installation housing, and the limiting roller is located above the discharging end of the conveyor belt.

[0010] Preferably, a plurality of transverse movement components are arranged in layers along the vertical direction at one end of the preheating component away from the first cooling cylinder, and a vertical movement component is arranged between adjacent transverse movement components. The plurality of vertical movement components are staggered in the vertical direction. The transverse movement component is composed of two horizontally parallel first lead screws, and the vertical movement component is composed of two vertically arranged second lead screws. Both the first lead screw and the second lead screw are rotatably connected to the installation shell body. Sliding rings are threadedly connected to the outer walls of the first lead screw and the second lead screw, and electromagnets are fixedly installed on the side walls of the sliding rings; The first clamping device corresponds to the position of the lowermost transverse movement component and is located between the two first lead screws. Third motors are respectively arranged at both ends of the first clamping device, and the output ends of the third motors are fixedly connected to the first clamping device. A first magnet is fixedly installed on one side of the third motor away from the first clamping device, and the first magnet is magnetically opposite to the electromagnet on the corresponding side. Two second magnets are fixedly installed on one side of the first clamping device away from the conveyor belt, and the first magnet and the second magnet have the same magnetic property.

[0011] Preferably, the winding component includes a first motor fixedly installed on the outer wall of the installation shell body. The output end of the first motor is fixedly connected to a second clamping device. The second clamping device corresponds to the position of the uppermost transverse movement component. A winding plate is fixedly installed on the second clamping device. An air outlet corresponding to the winding component is opened at the top of the installation shell body.

[0012] Preferably, the stretching mechanism includes a plurality of stretching components. The plurality of stretching components respectively correspond to the positions of the plurality of vertical movement components. An installation frame is fixedly installed on the inner wall of the installation shell body. The stretching component includes a first pressure roller, a second pressure roller, and a stretching roller. The second pressure roller is located above the first pressure roller, and the stretching roller is located above the second pressure roller. Both ends of the first pressure roller are connected to the installation frame through lifting components; The lifting component includes a lead screw motor fixedly installed on the installation frame. The output end of the lead screw motor is fixedly connected to a third lead screw. A sliding block is threadedly connected to the outer wall of the third lead screw. First electric telescopic rods are respectively installed at both ends of the first pressure roller. The two first electric telescopic rods are respectively fixedly connected to the sliding blocks on both sides. The telescopic end of one of the first electric telescopic rods is rotationally connected to the first pressure roller through a first vibration block, and the telescopic end of the other first electric telescopic rod is fixedly connected to a first rotation motor. The output end of the first rotation motor is fixedly connected to the first pressure roller; Two second electric telescopic rods are fixedly installed on the mounting frame. The two second electric telescopic rods are respectively located at both ends of the second pressure roller. One of the telescopic ends of the second electric telescopic rod is rotationally connected to the second pressure roller through a second vibration block, and the telescopic end of the other second electric telescopic rod is fixedly connected to a second rotating motor. The output end of the second rotating motor is fixedly connected to the second pressure roller. A third rotating motor is fixedly installed on the mounting frame, and the output end of the third rotating motor is fixedly connected to the stretching roller.

[0013] Preferably, a plurality of first pressure plates and second pressure plates are arranged on the outer surfaces of the first pressure roller and the second pressure roller in a staggered arrangement. The first pressure plates are fixedly installed on the outer wall of the pressure roller, and the second pressure plates are elastically connected to the outer wall of the pressure roller through conical springs and slide radially along the roller body. The inner diameter of the conical spring gradually decreases along the direction close to the center of the pressure roller. The first pressure plates on the first pressure roller correspond to the second pressure plates on the second pressure roller in position. Grooves and rubber protrusions are arranged on the outer wall of the second pressure plate.

[0014] Preferably, a plurality of coating assemblies are arranged in the installation shell. The plurality of coating assemblies respectively correspond to the plurality of stretching assemblies in position. The coating assembly includes an oil storage tank fixedly installed on the inner wall of the installation shell. A metering pump is fixedly installed on the side wall of the oil storage tank. The metering pump is fixedly communicated with a drip oil pipe. The end of the drip oil pipe far away from the metering pump is fixedly connected to an oil storage cotton, and the oil storage cotton is in contact with the corresponding second pressure roller.

[0015] Compared with the existing technology, the advantages of the present invention are as follows: 1. The present invention realizes the rapid shaping, crystallization optimization, stress relaxation and high elastic state transformation of molecular chains by arranging a plurality of cooling cylinders. The air flow is ejected by two inclined air blowing pipes. Only a small part of the air flow directly blows on the polyester fiber, and most of the air flow is changed in the flow path by the U-shaped wind baffle, forming an acceleration effect on both sides. The increased flow velocity can accelerate the heat exchange speed, more quickly take away the heat in the middle area of the fiber, significantly improve the cooling efficiency, and at the same time avoid most of the air flow directly impacting the polyester fiber, effectively preventing the polyester fiber from shaking or breaking due to excessive wind force, ensuring the quality of the polyester fiber and the stability of production. The air flows ejected by the two air blowing pipes meet, which can increase the degree of air mixing, further promote heat transfer and dissipation, and better realize the cooling effect. The third cooling cylinder is preheated for the first time, and the fourth cooling cylinder is preheated for the second time, which helps to reduce the risk of filament breakage during subsequent stretching, makes the fiber in a high elastic state, and creates favorable conditions for high magnification orientation and formation of shrinkage potential during subsequent stretching. The third cooling cylinder is located between the second and fourth cooling cylinders, which helps to achieve a smooth transition and uniform transfer of heat. The fourth cooling cylinder is not provided with a wind baffle assembly, and the hot air can directly contact the fiber fully, realizing more uniform and rapid preheating.

[0016] 2. The driving assembly on the outer wall of each cooling cylinder in the present invention can drive the blowing pipe to make a circular motion around the fiber, ensuring that the fiber is cooled and preheated by the airflow in all directions, ensuring the consistency of the overall cooling effect during cooling, avoiding insufficient or excessive local cooling, ensuring the consistency of the overall effect, improving the stability of product quality, accelerating heat exchange during preheating, shortening the preheating time, reducing the impact of wind on the fiber, and reducing the defective rate.

[0017] 3. In the present invention, the lateral and vertical moving components cooperate with the electromagnet adsorption switching to accurately control the movement of the first clamping device in different axial directions, guide the polyester fiber to pass through multiple groups of stretching components according to a preset path, ensure the accuracy of the movement trajectory of the tow, and reduce the tow fold angle by rotation when the first clamping device switches the moving direction. Axial stretching is achieved at different rotation speeds of multiple stretching rollers, and radial stretching is achieved by extrusion of the first and second pressure rollers. Alternating stretching allows the polyester fiber to gradually adapt to the tensile stress in different directions, achieve uniform deformation, and improve the overall performance of the fiber.

[0018] 4. In the present invention, the first and second pressure plates are alternately arranged on the outer surfaces of the first and second pressure rollers. The first pressure plate provides a stable reference pressure to maintain the stability of the fiber stretching shape. The second pressure plate is dynamically adjusted by a conical spring to squeeze the fiber multiple times to ensure uniform pressure and avoid fiber damage or poor processing effect caused by excessive or insufficient local pressure. The outer wall of the second pressure plate is provided with grooves and rubber protrusions to effectively break the fiber entanglement and adsorption, ensure the dispersion of the fibers and the smooth processing, and accommodate the fibers to prevent excessive compression damage. For different degrees of entanglement, the pressure roller generates shear force to separate the fibers by moving at a differential speed in the opposite or same direction. It is adjusted according to the specific situation of the fiber, while effectively separating the fibers, protecting the quality of the fibers, and improving the success rate of fiber processing and product quality.

[0019] 5. The present invention arranges a metering pump to drip oil onto the oil storage cotton in a regular and quantitative manner, thereby ensuring product quality while avoiding excessive use of oil. The oil storage cotton transfers the oil to the surface of the second pressure roller, and then applies it to the polyester fiber, so that the oil can be evenly applied to the polyester fiber, ensuring that each polyester fiber can receive relatively consistent oil, avoiding the adverse effects of local uneven application on fiber performance, and multiple presses of the second pressure plate can make the oil penetrate into the polyester fiber more evenly, not only lubricating the surface of the polyester fiber, but also fully protecting the inside, thereby improving product quality and performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a high shrinkage polyester fiber and a preparation device thereof proposed by the present invention; Figure 2 A full cross-sectional side view of a high shrinkage polyester fiber and a preparation device thereof proposed by the present invention; Figure 3 Schematic diagram of the U-shaped wind baffle and the first screen window structure of a high-shrinkage polyester fiber and its preparation device proposed by the present invention; Figure 4 Schematic diagram of the sliding plate and the fixed housing structure of a high-shrinkage polyester fiber and its preparation device proposed by the present invention; Figure 5 Schematic diagram of the first clamping device and the second lead screw structure of a high-shrinkage polyester fiber and its preparation device proposed by the present invention; Figure 6 is Figure 5 Enlarged schematic diagram of the structure at point A; Figure 7 is Figure 5 Enlarged schematic diagram of the structure at point B; Figure 8 Schematic diagram of the structure of the second pressure roller and the stretching roller of a high-shrinkage polyester fiber and its preparation device proposed by the present invention; Figure 9 Schematic diagram of the structure of the first pressure plate and the second pressure plate of a high-shrinkage polyester fiber and its preparation device proposed by the present invention; Figure 10 Schematic diagram of the winding plate structure of a high-shrinkage polyester fiber and its preparation device proposed by the present invention.

[0021] In the figure: 1 double-screw extruder, 2 feed inlet, 3 installation housing, 4 first air cooler, 5 second air cooler, 6 first hot air blower, 7 second hot air blower, 8 third hot air blower, 9 fourth hot air blower, 10 first motor, 11 air outlet, 12 spinneret plate, 13 first cooling cylinder, 14 support plate, 15 conveyor belt, 16 second cooling cylinder, 17 gear, 18 third cooling cylinder, 19 fourth cooling cylinder, 20 second motor, 21 first clamping device, 22 first pressure roller, 23 second pressure roller, 24 stretching roller, 25 first lead screw, 26 second lead screw, 27 oil storage tank, 28 second clamping device, 29 fifth hot air blower, 30 intake pipe, 31 limiting roller, 32 U-shaped wind baffle, 33 first screen window, 34 external toothed ring, 35 air blowing pipe, 36 sliding plate, 37 fixed housing, 38 sliding ring, 39 electromagnet, 40 first magnet, 41 second magnet, 42 third motor, 43 third lead screw, 44 first rotating motor, 441 second rotating motor, 442 third rotating motor, 45 first electric telescopic rod, 451 second electric telescopic rod, 46 oil storage cotton, 47 metering pump, 48 drip pipe, 49 sliding block, 50 first pressure plate, 51 second pressure plate, 52 conical spring, 53 winding plate, 54 second screen window. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0023] A high-shrinkage polyester fiber is made of conventional polyester chips with an intrinsic viscosity of 0.6-0.8 dL / g, and high shrinkage is achieved by a physical modification method. The shrinkage rate of the high-shrinkage polyester fiber under boiling water treatment conditions is 35%-45%.

[0024] Refer to Figures 1 to 10 , a high-shrinkage polyester fiber preparation device, which is applied to prepare the above-mentioned high-shrinkage polyester fiber, includes a double-screw extrusion rod 1 and an installation housing 3. The extrusion end of the double-screw extrusion rod 1 penetrates into the installation housing 3. A feed port 2 is fixedly communicated with the outer wall of the double-screw extrusion rod 1. The extrusion end of the double-screw extrusion rod 1 is fixedly connected with a spinneret plate 12. The polyester chips that have been dried are conveyed into the double-screw extrusion rod 1 through the feed port 2, and the material is fully melted under high-temperature conditions, and finally extruded through the spinneret plate 12 to form continuous and uniform filamentous fibers.

[0025] Inside the installation housing 3, the inclined first cooling cylinder 13 is rotatably connected through the support plate 14, and the first cooling cylinder 13 corresponds to the spinneret plate 12 in position. On the side of the first cooling cylinder 13 away from the spinneret plate 12, a preheating assembly is provided. The preheating assembly includes a second cooling cylinder 16, a third cooling cylinder 18, and a fourth cooling cylinder 19 that are rotatably connected inside the installation housing 3. The third cooling cylinder 18 is located between the second cooling cylinder 16 and the fourth cooling cylinder 19, and the second cooling cylinder 16 is located on the side of the third cooling cylinder 18 close to the first cooling cylinder 13. Fixed shells 37 are fixedly installed on the outer walls of each cooling cylinder. A sliding plate 36 is rotatably connected to the fixed shell 37. The fixed shell 37 and the sliding plate 36 form a sealed cavity. The sliding plate 36 is fixedly connected to an air inlet pipe 30 communicating with the cavity. And two air blowing pipes 35 communicating with the cavity are fixedly connected to the outer walls of each cooling cylinder. The first cold air blower 4, the second cold air blower 5, the first hot air blower 6, and the second hot air blower 7 are fixedly installed on the outer wall of the installation housing 3. The air inlet pipes 30 of the first cooling cylinder 13, the second cooling cylinder 16, the third cooling cylinder 18, and the fourth cooling cylinder 19 are fixedly communicated with the first cold air blower 4, the second cold air blower 5, the first hot air blower 6, and the second hot air blower 7 respectively. A conveyor belt 15 is fixedly installed inside the installation housing 3. The conveyor belt 15 passes through the second cooling cylinder 16, the third cooling cylinder 18, and the fourth cooling cylinder 19. The feeding end of the conveyor belt 15 corresponds to the position of the first cooling cylinder 13. The filamentous fibers extruded from the spinneret plate 12 enter the first cooling cylinder 13 for cooling and then fall onto the conveyor belt 15. The conveyor belt 15 conveys the fibers through the second cooling cylinder 16, the third cooling cylinder 18, and the fourth cooling cylinder 19 in sequence. The second cooling cylinder 16 performs secondary cooling, the third cooling cylinder 18 is passed through with hot air for primary preheating, and the fourth cooling cylinder 19 performs secondary preheating. The polyester fibers just extruded from the spinneret plate 12 are in a high-temperature molten state, and the molecular chains are active and disordered. The rapid cooling of the first cooling cylinder 13 can enable the fibers to quickly cool down, allowing the molecular chains to be quickly fixed, forming a relatively stable initial structure. The secondary cooling of the second cooling cylinder 16 further reduces the temperature of the fibers, further optimizing the crystallinity and orientation degree of the fibers. The increase in crystallinity can enhance the strength and hardness of the fibers, while the optimization of the orientation degree can improve the tensile properties and elastic modulus of the fibers. During the cooling process, some uneven internal stresses will inevitably be formed inside the fibers. The primary preheating and secondary preheating can enable the fiber molecular chains to obtain a certain amount of energy, thereby undergoing a certain degree of movement and rearrangement, relaxing these internal stresses, helping to reduce the risk of filament breakage during the subsequent stretching process of the fibers, and improving the production stability and product quality. Preheating can enable the fibers to be in a highly elastic state, weakening the intermolecular forces, making it easier to slip and orient under the action of external forces, enabling the fibers to achieve high magnification orientation during the subsequent stretching process and forming a shrinkage potential.

[0026] Inside the first cooling cylinder 13, the second cooling cylinder 16, and the third cooling cylinder 18, there is a windshield assembly arranged in the center. The windshield assembly is composed of two U-shaped windshields 32 symmetrically distributed up and down and two first window screens 33 symmetrically distributed left and right. The U-shaped windshields 32 are fixedly connected to the first window screens 33. Both the U-shaped windshields 32 and the first window screens 33 are fixedly installed in the corresponding cooling cylinders. A second window screen 54 is fixedly installed on the U-shaped windshields 32. The two second window screens 54 correspond to two air blowing pipes 35 with opposite inclination directions respectively. When the fibers enter the first cooling cylinder 13, the air blowing pipes 35 start to spray cold air. The inclined air blowing pipes 35 cause only a small part of the air flow to directly blow towards the polyester fibers through the second window screen 54, while most of the air flow will have its flow path changed by the U-shaped windshields 32. This design makes the air flow form an acceleration effect on both sides of the U-shaped windshields 32. According to Bernoulli's principle, when the air flow passes through a narrow channel or bypasses an obstacle, that is, the U-shaped windshields 32, the flow rate will increase, thus accelerating the heat exchange speed and being able to take away the heat in the middle area more quickly, significantly improving the cooling efficiency. The cooperation between the air blowing pipes 35 and the second window screens 54 ensures that most of the air flow does not directly impact the polyester fibers, effectively avoiding the problems of the polyester fibers shaking or breaking due to excessive wind force, and guaranteeing the quality of the polyester fibers and the stability of production. When the two air flows sprayed by the two air blowing pipes 35 meet, the stronger air flow will dominate. Part of the air flow continues to flow, and the other part undergoes a head-on collision, increasing the degree of air mixing and further promoting the transfer and dissipation of heat, which helps to better achieve the cooling effect. The fibers enter the second cooling cylinder 16. The mesh densities of the first window screens 33 and the second window screens 54 in the second cooling cylinder 16 are lower than those of the corresponding window screens in the first cooling cylinder 13, enabling the wind force to penetrate deep into the polyester fibers and cool the fibers more comprehensively and efficiently. Subsequently, the fibers enter the third cooling cylinder 18 for preliminary preheating, and finally enter the fourth cooling cylinder 19. There is no windshield assembly in the fourth cooling cylinder 19, and the hot air can directly contact the fibers fully, thereby realizing more uniform and rapid preheating of the fibers, which is beneficial to improving the performance of the fibers and the quality of subsequent processing.

[0027] An external toothed ring 34 is fixedly installed on the outer wall of each cooling cylinder. Two driving components are arranged inside the installation housing 3. The two driving components correspond to the positions of the first cooling cylinder 13 and the preheating component respectively. The driving component includes a second motor 20 fixedly installed in the installation housing 3. The output end of the second motor 20 is fixedly connected to a rotating shaft. A plurality of gears 17 are fixedly installed on the outer wall of the rotating shaft, and the gears 17 are meshed with the corresponding external toothed rings 34. During the cooling and preheating processes, the second motor 20 is started, and the blowing air pipe 35 is driven to move in a circular motion around the fiber through the gears 17 and the external toothed rings 34, and air is blown on the fiber to ensure that the fiber receives air cooling and preheating in all directions. During the cooling stage, the situation of insufficient local cooling or excessive cooling is avoided, the overall cooling effect of the fiber is ensured to be consistent, and the quality stability of the product is improved. During the preheating stage, it helps the hot air to contact the fiber more quickly and perform heat exchange, enabling the fiber to reach the ideal preheating temperature in a shorter time, which helps to improve production efficiency. At the same time, compared with the blowing in a fixed direction and concentrated wind force, it can effectively reduce the impact force of the wind on the fiber, ensure the integrity of the fiber during the processing process, and reduce the defective product rate.

[0028] The inner wall of the installation housing 3 is rotatably connected with a limiting roller 31, and the limiting roller 31 is located above the discharge end of the conveyor belt 15. The end of the preheating assembly away from the first cooling cylinder 13 is provided with multiple groups of lateral movement assemblies arranged in layers in the vertical direction. A vertical movement assembly is arranged between adjacent lateral movement assemblies, and multiple groups of vertical movement assemblies are staggered in the vertical direction. The lateral movement assembly consists of two horizontally parallel first lead screws 25, and the vertical movement assembly consists of two vertically arranged second lead screws 26. The first lead screw 25 and the second lead screw 26 are both rotatably connected in the installation housing 3, and a plurality of motors for driving the first lead screw 25 and the second lead screw 26 to rotate are fixedly installed in the installation housing 3. The first lead screw 25 and the second lead screw 26 are respectively fixedly connected to the output ends of the corresponding motors. The outer walls of the first lead screw 25 and the second lead screw 26 are both threadedly connected with sliding rings 38, and an electromagnet 39 is fixedly installed on the side wall of the sliding ring 38. A first clamping device 21 (this is prior art and will not be elaborated here) is arranged inside the installation housing 3. The first clamping device 21 corresponds to the position of the lowermost lateral movement assembly and is located between the two first lead screws 25. The discharge end of the conveyor belt 15 corresponds to the position of the first clamping device 21. Third motors 42 are respectively arranged at both ends of the first clamping device 21. The output ends of the third motors 42 are fixedly connected to the first clamping device 21. A first magnet 40 is fixedly installed on the side of the third motor 42 away from the first clamping device 21, and the first magnet 40 attracts the electromagnet 39 on the corresponding side. Two second magnets 41 are fixedly installed on the side of the first clamping device 21 away from the conveyor belt 15. The first magnet 40 and the second magnet 41 have the same magnetic property. A winding assembly is arranged in the installation housing 3. The winding assembly includes a first motor 10 and a second clamping device 28 (this is prior art and will not be elaborated here). The first motor 10 is fixedly installed on the outer wall of the installation housing 3. The second clamping device 28 corresponds to the position of the uppermost lateral movement assembly. The output end of the first motor 10 is fixedly connected to the second clamping device 28. A winding plate 53 is fixedly installed on the second clamping device 28.

[0029] There are multiple stretching components arranged inside the installation housing 3, and the multiple stretching components correspond to the multiple vertical movement components in position. An installation frame is fixedly installed on the inner wall of the installation housing 3. The stretching component includes a first pressure roller 22, a second pressure roller 23, and a stretching roller 24. The second pressure roller 23 is located above the first pressure roller 22, and the stretching roller 24 is located above the second pressure roller 23. Lifting components are arranged at both ends of the first pressure roller 22. The lifting component includes a lead screw motor fixedly installed on the installation frame. The output end of the lead screw motor is fixedly connected with a third lead screw 43. A sliding block 49 is threadedly connected to the outer wall of the third lead screw 43. First electric telescopic rods 45 are respectively installed at both ends of the first pressure roller 22. The two first electric telescopic rods 45 are respectively fixedly connected with the sliding blocks 49 on both sides. The telescopic end of the first electric telescopic rod 45 on one side is rotationally connected to the first pressure roller 22 through a first vibration block. The telescopic end of the first electric telescopic rod 45 on the other side is fixedly connected with a first rotating motor 44. The output end of the first rotating motor 44 is fixedly connected with the first pressure roller 22. Two second electric telescopic rods 451 are fixedly installed on the installation frame. The two second electric telescopic rods 451 are respectively located at both ends of the second pressure roller 23. The telescopic end of one of the second electric telescopic rods 451 is rotationally connected to the second pressure roller 23 through a second vibration block. The telescopic end of the other second electric telescopic rod 451 is fixedly connected with a second rotating motor 441. The output end of the second rotating motor 441 is fixedly connected with the second pressure roller 23. A third rotating motor 442 is fixedly installed on the installation frame. The output end of the third rotating motor 442 is fixedly connected with the stretching roller 24.

[0030] After the polyester fiber is output from the fourth cooling cylinder 19, it is clamped by the first clamping device 21. The first lead screw 25 drives the sliding ring 38 to drive the first clamping device 21 to move rightward. The third lead screw 43 drives the sliding block 49 to drive the first pressure roller 22 to move downward, so that the first clamping device 21 smoothly passes between the first pressure roller 22 and the second pressure roller 23. The first clamping device 21 moves to the corresponding vertical movement assembly, and the electromagnet 39 of the second lead screw 26 adsorbs the second magnet 41 on the first clamping device 21. The rotation of the second lead screw 26 causes the first clamping device 21 to move upward to the next set of horizontal movement assemblies. Switch back to the first lead screw 25 to drive the first clamping device 21 to move leftward. The first clamping device 21 drives the polyester fiber to move horizontally and upward continuously, so that the polyester fiber passes through multiple stretching assemblies and contacts the outer walls of the first pressure roller 22, the second pressure roller 23 and the stretching roller 24. The polyester fiber finally reaches the second clamping device 28. The entire process realizes the movement control in different axial directions through the adsorption and switching of the electromagnet 39 to ensure the smooth transfer of the filament bundle. After the winding plate 53 takes over the filament bundle, the first clamping device 21 moves to the adjacent vertical movement assembly to avoid hindering the winding work of the second clamping device 28. The first motor 10 is started, and the second clamping device 28 rotates for winding. Through the driving of different lead screws and the adsorption and switching of the electromagnet 39 and the magnet, the precise movement control of the first clamping device 21 in different axial directions such as horizontal and vertical can be realized, so that the polyester fiber can accurately pass through multiple stretching assemblies according to the preset path, ensuring the accuracy of the movement trajectory of the filament bundle during the production process. When the first clamping device 21 moves upward and switches to horizontal movement, the third motor 42 drives it to rotate 180 degrees, effectively reducing the filament bundle fold angle. Excessive filament bundle fold angle will affect the quality of the filament and subsequent processing. By reducing the fold angle, the physical properties and appearance quality of the filament bundle can be guaranteed, improving the product quality. When the polyester fiber is wound, multiple stretching rollers 24 axially stretch the polyester fiber at different speeds. At the same time, the first pressure roller 22 and the second pressure roller 23 extrude the polyester fiber to realize the radial stretching of the polyester fiber. Alternate radial and axial stretching can enable the polyester fiber to gradually adapt to the tensile stress in different directions, which helps the polyester fiber to achieve more uniform deformation in the axial and radial directions, thereby improving the overall performance of the fiber. An air outlet 11 is opened at the top of the installation housing 3, and the air outlet 11 corresponds to the winding assembly position, which can reduce the temperature near the second clamping device 28, so that the residual stress can be reduced or eliminated during winding.

[0031] The outer surfaces of the first pressure roller 22 and the second pressure roller 23 are both provided with a plurality of first pressure plates 50 and second pressure plates 51 in a staggered arrangement. The first pressure plates 50 are fixedly installed on the outer walls of the corresponding pressure rollers, and the second pressure plates 51 are elastically connected to the outer walls of the pressure rollers through conical springs 52 and slide radially along the roller body. The inner diameter of the conical spring 52 gradually decreases along the direction close to the center of the pressure roller. The first pressure plates 50 on the first pressure roller 22 correspond to the second pressure plates 51 on the second pressure roller 23. The outer walls of the second pressure plates 51 are provided with protrusions and grooves, and the protrusion parts are made of rubber. The first pressure plates 50 are mainly responsible for radially stretching the polyester fibers. The second pressure plates 51 have the function of improving the fiber distribution. The protrusions can effectively break the entanglement and electrostatic adsorption between the fibers, and the recessed areas provide a space for the fibers to be accommodated to prevent over-compression damage. The rubber has good elasticity and flexibility, so that the protrusion parts can adapt to the thickness change of the polyester fibers to ensure uniform extrusion without damaging the fibers. The first pressure plates 50 of the first pressure roller 22 correspond to the second pressure plates 51 of the second pressure roller 23, and the second pressure plates 51 of the first pressure roller 22 correspond to the first pressure plates 50 of the second pressure roller 23. The first pressure plates 50 provide a stable reference pressure, which helps the polyester fibers to maintain a stable shape during the stretching process. The second pressure plates 51 achieve dynamic adjustment through the built-in conical springs 52, so that the second pressure plates 51 can move back and forth during the process of contacting the polyester fibers, thereby squeezing the polyester fibers multiple times to ensure that each polyester fiber can receive uniform and sufficient pressure. The conical springs 52 can also absorb the vibration and impact during the processing. The conical springs 52 have a progressive stiffness characteristic. In the initial stage, the flexible contact can gently disperse the fiber bundles, and in the subsequent stage, a continuous and stable pressing force is provided. When the first pressure roller 22 and the second pressure roller 23 are pressed, they will also vibrate slightly under the action of the vibration blocks, thereby improving the effect of forked polyester fibers. When the polyester fibers are severely entangled, the first electric telescopic rod 45 and the second electric telescopic rod 451 are started to drive the first pressure roller 22 and the second pressure roller 23 to move a small range in opposite directions, generating a relative shear force on the polyester fibers to separate the polyester fibers and prevent them from entangling with each other. When they are slightly entangled, a differential movement in the same direction is adopted to achieve fiber splitting through a gentle shearing action to avoid over-stretching damage to the fibers.

[0032] There are multiple sets of coating components arranged inside the installation housing 3, and the multiple sets of coating components correspond to the positions of multiple sets of stretching components respectively. The coating component includes an oil storage tank 27 fixedly installed on the inner wall of the installation housing 3. A metering pump 47 is fixedly installed on the side wall of the oil storage tank 27. The metering pump 47 is fixedly connected to a drip oil pipe 48. The end of the drip oil pipe 48 away from the metering pump 47 is fixedly connected to an oil storage cotton 46. The oil storage cotton 46 is in contact with the corresponding second pressure roller 23. The metering pump 47 can regularly and quantitatively drip the oil agent in the oil storage tank 27 onto the oil storage cotton 46 through the drip oil pipe 48, realizing the precise control of the oil agent supply. It can accurately provide an appropriate amount of oil agent according to the production requirements of polyester fibers, avoiding the waste or insufficient supply of the oil agent. The oil agent is first transferred to the oil storage cotton 46, and then the oil storage cotton 46 transfers the oil agent to the surface of the second pressure roller 23, and then the polyester fiber is coated, so that the oil agent can be more evenly distributed on the surface of the second pressure roller 23, and then evenly coated on the polyester fiber. Moreover, through the multiple presses of the second pressure plate 51, the oil agent can more evenly penetrate into the interior of the polyester fiber, enabling the polyester fiber to be fully and evenly lubricated and protected, improving the quality and performance of the product. The oil agent smeared on the surface of the polyester fiber and penetrated into the interior can play a lubricating role, reducing the friction between the polyester fiber and other components during the production process and reducing the degree of wear, thereby improving the strength and toughness of the polyester fiber.

[0033] The outer wall of the installation housing 3 is fixedly installed with a third hot air blower 8, a fourth hot air blower 9 and a fifth hot air blower 29. The second hot air blower 7, the third hot air blower 8, the fifth hot air blower 29 and the fourth hot air blower 9 are arranged in a stepped manner with different heights. By adjusting the temperatures of the multiple stretching rollers 24 to gradually increase from bottom to top (this is prior art and will not be elaborated here), the polyester fiber can gradually adapt to higher temperatures during the stretching process, which helps the orientation and arrangement of the polyester fiber molecular chains, improves the stretching strength and performance. The hot air in the fourth cooling cylinder 19, the third hot air blower 8, the fifth hot air blower 29 and the fourth hot air blower 9 can maintain the temperature at each height to match the temperature of the stretching rollers 24, ensuring that the polyester fiber is in the optimal temperature state during the stretching process, thus guaranteeing the stretching quality. Utilizing the property of hot air rising, the temperature of the upper layer is higher than that of the lower layer, which helps to maintain the relative stability and uniformity of the temperature in the stretching area. This natural temperature distribution cooperates with the temperature gradient of the stretching rollers 24 to form a relatively ideal temperature field, providing a uniform thermal environment for the polyester fiber, which is beneficial to improving the product quality and reducing the product performance differences caused by temperature differences. As the temperature rises, the softening degree of the polyester fiber increases and the stretchability improves. The distance between the first pressure rollers 22 and the second pressure rollers 23 in multiple stretching assemblies gradually increases from bottom to top. Therefore, the pressure of the multiple first pressure rollers 22 on the polyester fiber gradually decreases, which can avoid overstretching or causing surface damage. The diameters of the multiple stretching rollers 24 gradually increase from bottom to top, increasing the contact area with the polyester fiber. The larger contact area enables the stretching force to be more evenly distributed on the polyester fiber, avoiding the situation of excessive or insufficient local stress, thereby improving the uniformity and stability of stretching.

[0034] The present invention uses conventional polyester chips as raw materials and prepares high-shrinkage polyester by physical modification. Before preparation, the dried polyester chips are first put into the double-screw extruder 1 through the feed port 2, melted by high-temperature heating, and then extruded into continuous filaments under the action of the spinneret 12, and finally enter the first cooling cylinder 13 for cooling. When using the first cooling cylinder 13 for cooling, the first air cooler 4 is started, and cold air is input into the first cooling cylinder 13 through the air inlet pipe 30 and finally sprayed out from the air blowing pipe 35. The two air blowing pipes 35 are inclined at a certain angle, so that a small part of the air flow blows onto the polyester fiber from the second screen window 54, and the remaining most of the air flow will change the flow path of the air flow due to the U-shaped wind baffle 32, so that an acceleration effect is formed on both sides of the shielding object, accelerating the heat in the middle area to be carried away by the fluid. When using the first cooling cylinder 13 for cooling, a higher wind speed and a lower air temperature can be adopted to quickly take away the heat on the surface of the polyester fiber. After being cooled on the outer layer, the polyester fiber falls onto the conveyor belt 15 and starts to enter the second cooling cylinder 16. The density of the first screen window 33 and the second screen window 54 in the second cooling cylinder 16 decreases, and the polyester fiber can be affected by more wind force. Then it starts to enter the third cooling cylinder 18, the wind speed is reduced, and the air temperature is increased to start preliminary preheating of the polyester fiber to prepare for subsequent stretching. Finally, the polyester fiber enters the fourth cooling cylinder 19. The first screen window 33 and the second screen window 54 are not installed in the fourth cooling cylinder 19, so that the preheating is further uniform. During the cooling and preheating process, the second motor 20 can be started, and the air blowing pipe 35 is driven by the gear 17 and the external tooth ring 34 to blow annular air on the polyester fiber to improve the uniformity of cooling or heating of the polyester fiber.

[0035] The polyester fiber coming out of the fourth cooling cylinder 19 is clamped by the first clamping device 21. The electromagnets 39 on both sides of the first clamping device 21 are activated to adsorb the first magnet 40. Subsequently, the first lead screw 25 is activated, and the first clamping device 21 is driven forward continuously through the sliding ring 38. The third lead screw 43 drives the first pressure roller 22 to move downward through the sliding block 49. The first clamping device 21 will pass through between the first pressure roller 22 and the second pressure roller 23. Subsequently, the electromagnet 39 on the first lead screw 25 is disconnected, and the electromagnet 39 on the second lead screw 26 is activated to adsorb the second magnet 41 on the first clamping device 21. Subsequently, the second lead screw 26 is activated to drive the first clamping device 21 to move upward. When the first clamping device 21 rises above the stretching roller 24, the electromagnet 39 on the second lead screw 26 is disconnected, and the electromagnet 39 on the first lead screw 25 is activated to start driving the first clamping device 21 to move leftward, making the polyester fiber fit the stretching roller 24. At the same time, the third motor 42 is activated to make the first clamping device 21 rotate counterclockwise by 180°, reducing the folding angle between the polyester fiber and the first clamping device 21 to prevent the polyester fiber from being pulled off. Subsequently, the above process is repeated. Finally, the first clamping device 21 moves to the second clamping device 28, and the polyester fiber is clamped by the winding plate 53. At this time, the first clamping device 21 retracts to the middle of the second lead screw 26. Subsequently, the first motor 10 is activated, and the second clamping device 28 starts to drive the winding plate 53 to wind the polyester fiber.

[0036] When the polyester fiber is being wound, multiple stretching rollers 24 perform axial stretching on the polyester fiber at different rotation speeds. The first pressure roller 22 and the second pressure roller 23 perform radial stretching on the polyester fiber through extrusion. When the second pressure plate 51 is subjected to uneven resistance from the polyester fiber, the internal conical spring 52 will deform, enabling the second pressure plate 51 to move back and forth during the process of contacting the polyester fiber to ensure that each polyester fiber can receive uniform and sufficient pressure. When the bundling and doubling of the polyester fiber are relatively serious, the first pressure roller 22 and the second pressure roller 23 move in opposite directions in a small range to separate the polyester fiber. When the winding situation is relatively mild, the first pressure roller 22 and the second pressure roller 23 move in the same direction at different speeds. This differential movement will generate a relatively gentle shear force on the polyester fiber to separate the polyester fiber.

[0037] When stretching, the sizing agent in the oil storage tank 27 can be dropped onto the oil storage cotton 46 at regular intervals and in a fixed quantity through the metering pump 47 and the drip oil pipe 48. When the oil storage cotton 46 comes into contact with the second pressure roller 23, the sizing agent is transferred to the surface of the second pressure roller 23, and then the polyester fiber is coated with the sizing agent attached to the surface. The sizing agent can also penetrate more evenly into the interior of the polyester fiber through multiple presses of the second pressure plate 51. The temperature of the stretching roller 24 gradually increases from bottom to top, enabling the polyester fiber to gradually adapt to a higher temperature during the stretching process. The hot air in the fourth cooling cylinder 19, the third hot air blower 8, the fifth hot air blower 29, and the fourth hot air blower 9 can maintain the temperature at each height consistent with the temperature of the stretching roller 24.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high shrinkage polyester fiber, characterized in that: The high shrinkage polyester fiber is made of conventional polyester chips with a characteristic viscosity of 0.6-0.8 dL / g, and a physical modification method is used to achieve high shrinkage. The shrinkage rate of the high shrinkage polyester fiber under boiling water treatment is 35%-45%.

2. A high shrinkage polyester fiber preparation device, the device is used to produce the high shrinkage polyester fiber according to claim 1, comprising a double-screw extrusion rod (1) and a mounting shell (3), wherein the extrusion end of the double-screw extrusion rod (1) extends through the mounting shell (3) and is fixedly connected to a spinneret (12), characterized in that: A first cooling cylinder (13) corresponding to the position of the spinneret (12) is arranged in the installation shell (3); a preheating assembly is arranged on a side of the first cooling cylinder (13) away from the spinneret (12); the preheating assembly comprises a second cooling cylinder (16), a third cooling cylinder (18) and a fourth cooling cylinder (19) rotatably connected in the installation shell (3); two blowing pipes (35) with opposite inclination directions are fixedly connected to the outer wall of each cooling cylinder; and a wind shield assembly arranged in the center is arranged inside the first cooling cylinder (13), the second cooling cylinder (16) and the third cooling cylinder (18); The windshield assembly is composed of two U-shaped windshields (32) symmetrically distributed in the upper and lower parts and two first screens (33) symmetrically distributed in the left and right parts, and the U-shaped windshield (32) is fixedly connected to the first screens (33), and the U-shaped windshield (32) and the first screens (33) are both fixedly connected to the inner wall of the cooling cylinder, and a second screen (54) is fixedly installed on the U-shaped windshield (32), and the two second screens (54) respectively correspond to the positions of two blowing pipes (35) in the cooling cylinder, and the mesh density of the first screen (33) and the second screen (54) in the second cooling cylinder (16) is lower than the mesh density of the corresponding first screen (33) and the second screen (54) in the first cooling cylinder (13), and a stretching mechanism is arranged at one end of the preheating assembly away from the spinneret (12), and a winding assembly is arranged above the stretching mechanism.

3. The high shrinkage polyester fiber preparation device according to claim 2, characterized in that: A support plate (14) is fixedly installed in the installation shell (3), the first cooling cylinder (13) is rotatably connected to the support plate (14), the third cooling cylinder (18) is located between the second cooling cylinder (16) and the fourth cooling cylinder (19), the outer wall of each cooling cylinder is provided with a closed cavity connected to the blowing pipe (35), the closed cavity is composed of a fixed shell (37) and a sliding plate (36), the fixed shell (37) is fixedly installed on the outer wall of the cooling cylinder, the fixed shell (37) is rotatably connected to the sliding plate (36), and the sliding plate (36) is fixedly connected to an air inlet pipe (30) connected to the cavity; The outer wall of the installation shell (3) is fixedly mounted with a first cold air machine (4), a second cold air machine (5), a first hot air machine (6) and a second hot air machine (7); the air inlet pipes (30) on the first cooling tube (13), the second cooling tube (16), the third cooling tube (18) and the fourth cooling tube (19) are respectively fixedly connected to the first cold air machine (4), the second cold air machine (5), the first hot air machine (6) and the second hot air machine (7); the outer wall of the installation shell (3) is fixedly mounted with a third hot air machine (8), a fourth hot air machine (9) and a fifth hot air machine (29); the installation heights of the second hot air machine (7), the third hot air machine (8), the fifth hot air machine (29) and the fourth hot air machine (9) are successively increased in the vertical direction.

4. The high shrinkage polyester fiber preparation device according to claim 3, characterized in that: An outer toothed ring (34) is fixedly mounted on the outer wall of each cooling cylinder. Two sets of drive components are arranged inside the mounting shell (3), and the two sets of drive components correspond to the positions of the first cooling cylinder (13) and the preheating component respectively. The drive components include a second motor (20) fixedly mounted in the mounting shell (3), an output end of the second motor (20) is fixedly connected to a rotating shaft, a plurality of gears (17) are fixedly mounted on the outer wall of the rotating shaft, and the gears (17) are meshed with the outer toothed rings (34) of the corresponding cooling cylinders.

5. The high shrinkage polyester fiber preparation device according to claim 2, characterized in that: A conveyor belt (15) is fixedly installed inside the installation shell (3), and the conveyor belt (15) passes through the second cooling cylinder (16), the third cooling cylinder (18) and the fourth cooling cylinder (19). A first clamping device (21) is arranged inside the installation shell (3), and the feed end of the conveyor belt (15) corresponds to the position of the first cooling cylinder (13), and the discharge end corresponds to the position of the first clamping device (21). The inner wall of the installation shell (3) is rotatably connected to a limiting roller (31), and the limiting roller (31) is located above the discharge end of the conveyor belt (15).

6. The high shrinkage polyester fiber preparation device according to claim 5, characterized in that: A plurality of groups of lateral moving components are arranged in layers along the vertical direction at one end of the preheating component away from the first cooling cylinder (13), and a vertical moving component is arranged between adjacent lateral moving components, and the plurality of groups of vertical moving components are staggered in the vertical direction, the lateral moving component is composed of two first screw rods (25) arranged horizontally and in parallel, and the vertical moving component is composed of two second screw rods (26) arranged vertically, the first screw rod (25) and the second screw rod (26) are both rotatably connected in the mounting shell (3), the outer walls of the first screw rod (25) and the second screw rod (26) are both threadedly connected with a sliding ring (38), and the side wall of the sliding ring (38) is fixedly installed with an electromagnet (39); The first clamping device (21) corresponds to the position of the lowest lateral moving component and is located between the two first screw rods (25). A third motor (42) is provided at each end of the first clamping device (21). The output end of the third motor (42) is fixedly connected to the first clamping device (21). A first magnet (40) is fixedly mounted on a side of the third motor (42) away from the first clamping device (21), and the first magnet (40) has opposite magnetic properties to the electromagnet (39) on the corresponding side. Two second magnets 41 are fixedly mounted on a side of the first clamping device (21) away from the conveyor belt (15), and the first magnet 40 and the second magnet 41 have the same magnetic properties.

7. The high shrinkage polyester fiber preparation device according to claim 6, characterized in that: The winding assembly comprises a first motor (10) fixedly mounted on the outer wall of the mounting shell (3); an output end of the first motor (10) is fixedly connected to a second clamping device (28); the second clamping device (28) corresponds to the position of the uppermost lateral moving assembly; a winding plate (53) is fixedly mounted on the second clamping device (28); and an air outlet (11) corresponding to the position of the winding assembly is provided at the top of the mounting shell (3).

8. The high shrinkage polyester fiber preparation device according to claim 2, characterized in that: The stretching mechanism comprises a plurality of stretching components, the plurality of stretching components respectively corresponding to the positions of the plurality of vertical moving components, a mounting frame is fixedly mounted on the inner wall of the mounting shell (3), the stretching components comprise a first pressure roller (22), a second pressure roller (23) and a stretching roller (24), the second pressure roller (23) being located above the first pressure roller (22), the stretching roller (24) being located above the second pressure roller (23), and the two ends of the first pressure roller (22) being respectively connected to the mounting frame via lifting components; The lifting assembly comprises a screw motor fixedly mounted on a mounting frame, the output end of the screw motor being fixedly connected to a third screw (43), the outer wall of the third screw (43) being threadedly connected to a sliding block (49), first electric telescopic rods (45) being respectively mounted at both ends of the first pressure roller (22), two first electric telescopic rods (45) being respectively fixedly connected to the sliding blocks (49) on both sides, and the telescopic end of one of the first electric telescopic rods (45) being rotationally connected to the first pressure roller (22) via a first vibration block, the telescopic end of the other first electric telescopic rod (45) being fixedly connected to a first rotating motor (44), and the output end of the first rotating motor (44) being fixedly connected to the first pressure roller (22); Two second electric telescopic rods (451) are fixedly mounted on the mounting frame. The two second electric telescopic rods (451) are respectively located at two ends of the second pressure roller (23). The telescopic end of one of the second electric telescopic rods (451) is rotationally connected to the second pressure roller (23) via a second vibration block. The telescopic end of the other second electric telescopic rod (451) is fixedly connected to a second rotating motor (441). The output end of the second rotating motor (441) is fixedly connected to the second pressure roller (23). A third rotating motor (442) is fixedly mounted on the mounting frame. The output end of the third rotating motor (442) is fixedly connected to the stretching roller (24).

9. The high shrinkage polyester fiber preparation device according to claim 8, characterized in that: The outer surfaces of the first pressure roller (22) and the second pressure roller (23) are provided with a plurality of first pressure plates (50) and second pressure plates (51) in a staggered manner, the first pressure plates (50) being fixedly mounted on the outer wall of the pressure roller, the second pressure plates (51) being elastically connected to the outer wall of the pressure roller via a conical spring (52) and sliding radially along the roller body, the inner diameter of the conical spring (52) gradually decreasing in a direction approaching the center of the pressure roller, the first pressure plate (50) on the first pressure roller (22) and the second pressure plate (51) on the second pressure roller (23) being positioned correspondingly, and the outer wall of the second pressure plate (51) being provided with grooves and protrusions made of rubber material.

10. The high shrinkage polyester fiber preparation device according to claim 8, characterized in that: A plurality of groups of coating components are arranged in the installation shell (3), and the plurality of groups of coating components correspond to the positions of the plurality of groups of stretching components respectively. The coating components include an oil storage tank (27) fixedly mounted on the inner wall of the installation shell (3), a metering pump (47) fixedly mounted on the side wall of the oil storage tank (27), the metering pump (47) is fixedly connected to an oil dripping pipe (48), and an end of the oil dripping pipe (48) away from the metering pump (47) is fixedly connected to an oil storage cotton (46), and the oil storage cotton (46) is in contact with the corresponding second pressure roller (23).

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