Polylactic acid tow processing and drying equipment

Abstract

The invention discloses polylactic acid tow processing and drying equipment, and relates to the technical field of polylactic acid tow processing.The polylactic acid tow processing and drying equipment comprises a machine base, a drying box, a swing type hot air mechanism and a shifting mechanism, and the swing type hot air mechanism is arranged at the bottom of the drying box and used for blowing hot air to polylactic acid tows; a negative pressure mechanism for sucking air in the drying box is arranged at the top of the drying box; the shifting mechanism comprises an elastic shifting piece and a transverse reciprocating driving mechanism. In the process that polylactic acid tows penetrate through the drying box, the arranged electric telescopic rods continuously drive the distributed elastic stirring pieces to descend and be inserted between the tows through the transverse frame, and when the transverse frame descends to the position where the limiting baffle is located and stops, the electric telescopic rods continue to extend; the transverse frame drives the distributed elastic shifting pieces to do transverse reciprocating motion through the matching effect of the pin rollers and the arranged wave type sliding grooves, so that the elastic shifting pieces inserted into the gaps of the tows can conveniently shift the polylactic acid tows to be scattered, loosening is achieved, and the drying effect and efficiency are conveniently improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polylactic acid tow processing, in particular to polylactic acid tow processing and drying equipment. Background Art

[0002] Polylactic acid (PLA) fiber is an environmentally friendly material used in cigarette filters. It boasts environmentally friendly, healthy, and efficient properties. PLA fiber is typically manufactured through a melt spinning process, which includes extrusion, cooling, drawing, and winding. During the manufacturing process, the fiber is processed into a continuous tow, which is then drawn to form a fiber structure with a specific orientation and strength.

[0003] In the existing production process of polylactic acid fiber, the raw materials are first pretreated and dried to a certain extent, then processed by melt spinning equipment, and drawn and shaped to form tows, which are then wound by winding equipment. During the winding process, the tows will be dried by drying equipment.

[0004] The shortcomings of the existing polylactic acid tow drying process are: during the drying process, the existing continuous polylactic acid tow relies on the traction effect to continuously pass through the inside of the drying equipment. The existing drying equipment generally adopts a hot air circulation oven, and uses the generated hot air to blow towards the passing tow to take away the moisture in the tow to achieve drying. For looser tows, they can be directly dried by blowing hot air, but for polylactic acid fiber tows that are closely arranged together, the overall thickness and density are high, and it is difficult to blow the tows directly with hot air to the deep layer of the tow, so it is difficult to blow away the moisture, resulting in insufficient drying effect and low efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a polylactic acid filament processing and drying device to solve the technical problem in the prior art that the polylactic acid filaments are not dried well enough and the efficiency is not high enough when they are directly dried by hot air when the density is high and the overall thickness is large.

[0006] The technical problem to be solved by the present invention can be achieved through the following technical solutions:

[0007] A polylactic acid tow processing and drying device comprises a machine base and a drying box, and also comprises:

[0008] A swinging hot air mechanism is provided at the bottom of the drying box for blowing hot air toward the polylactic acid tow, and a negative pressure mechanism is provided at the top of the drying box for sucking the air in the drying box;

[0009] The toggle mechanism includes an elastic paddle and a transverse reciprocating drive mechanism. A plurality of elastic paddles are arranged transversely. The elastic paddles are used to be inserted between the threads of the polylactic acid tow. The transverse reciprocating motion mechanism is used to drive the distributed elastic paddles to reciprocate transversely.

[0010] Preferably, the horizontal reciprocating drive mechanism includes an electric telescopic rod, a reciprocating sliding connection and a horizontal frame. The electric telescopic rod is fixedly installed on the top of the drying box, the telescopic end of the electric telescopic rod is connected to the horizontal frame through a reciprocating sliding connection, the elastic paddle is fixedly connected to the bottom of the horizontal frame, and limit baffles are fixedly provided on the inner walls on both sides of the drying box, and the limit baffles are aligned with the edges of the horizontal frame.

[0011] Preferably, the reciprocating sliding connection includes a connecting side plate and a roller, the connecting side plate is vertically fixedly connected to the horizontal frame, the roller is horizontally rotatably connected to the telescopic end of the electric telescopic rod, a wave-like slide groove is longitudinally opened on the connecting side plate, the end of the roller is slidably fitted and inserted into the wave-like slide groove, and a limiting guide is provided between the two sides of the horizontal frame and the inner wall of the drying box.

[0012] Preferably, the limiting guide member includes a transverse guide rail, a connecting guide sleeve and a connecting guide rod, the transverse guide rail is fixedly connected to the inner top of the drying box, the connecting guide sleeve is slidably connected to the transverse guide rail, the connecting guide rod is vertically fixedly connected to the edge of the transverse frame, and the connecting guide rod slides through the corresponding connecting guide sleeve.

[0013] Preferably, the swinging hot air mechanism includes an air outlet nozzle, a hot air blower, a rotating connector and a linkage mechanism. The air outlet nozzle is arranged at the inner bottom of the drying box, and the air outlet nozzle is rotatably connected to the inner bottom of the drying box through a rotating connector. The hot air blower is installed under the machine base, and the air outlet nozzle is connected to the air outlet end of the hot air blower through a hose. The horizontal frame that reciprocates laterally drives the air outlet nozzle to swing back and forth through the linkage mechanism.

[0014] Preferably, the rotating connecting member includes an axle frame, which is provided with two pieces and symmetrically distributed on both sides of the bottom of the air outlet. The bottom of the air outlet is fixedly connected with a connecting shaft, and the two ends of the connecting shaft are respectively rotatably connected to the corresponding axle frames, and the connecting shaft is cooperatively connected with the linkage mechanism.

[0015] Preferably, the linkage mechanism includes a linkage baffle, a connecting slide and a rubbing mechanism. A connecting slide is provided on each of the two limit baffles. There are two linkage baffles, which are respectively slidably connected to the corresponding connecting slides. A limiting spring is also connected between the linkage baffle and the corresponding connecting slide. There are two groups of rubbing mechanisms, and each linkage baffle is respectively connected to the connecting shaft through the corresponding rubbing mechanism.

[0016] Preferably, the two groups of the rubbing mechanisms are symmetrically distributed around the center, and each group of the rubbing mechanisms includes a linkage wheel and a rubbing bar. The two ends of the connecting shaft are coaxially fixedly connected to the linkage wheels respectively, and the two linkage baffles are fixedly connected to the rubbing bars respectively, and the rubbing bars cooperate with the linkage wheels.

[0017] Preferably, a transition support frame is provided between the air outlet nozzle and the elastic paddle, and the transition support frame is fixedly connected to the inner wall of the drying box.

[0018] Preferably, the negative pressure mechanism includes a negative pressure pump, which is fixedly installed on the top of the drying box. A suction pipe is installed on the negative pressure end of the negative pressure pump, and the suction pipe is connected to the top of the drying box.

[0019] Beneficial effects of the present invention:

[0020] 1. When the polylactic acid tow of the present invention passes through the drying oven, the electric telescopic rod is continuously driven by the distributed elastic paddles to descend and insert between the tows through the cross frame, and when the cross frame descends to the position where the limit baffle is located and stops, the electric telescopic rod continues to extend, and the cross frame drives the distributed elastic paddles to move back and forth horizontally through the cooperation of the rollers and the provided wave-type slide grooves. In this way, the elastic paddles inserted between the gaps between the tows can spread out the polylactic acid tows, achieve looseness, facilitate hot air blowing to the deep position of the tows, help to discharge water vapor in the tows, and improve the drying effect and efficiency.

[0021] 2. In the process of reciprocating motion of the elastic paddle driven by the horizontal frame of the present invention, the horizontal frame acts on the linkage baffles on both sides in turn, and the corresponding linkage baffles rely on the provided rubbing bars to rub the corresponding linkage wheels to rotate, thereby deflecting the air outlet nozzle, facilitating reciprocating swinging. The swinging causes hot air to blow into the gap between the tows from different angles, breaking the static laminar boundary layer, forcing the airflow to penetrate deep into the fiber, and reducing the "airflow shielding" effect; the non-steady-state airflow generated by the swinging enhances convective heat transfer and accelerates the diffusion of moisture from the fiber surface to the air; it effectively improves the drying efficiency of the polylactic acid tow, and is particularly suitable for the production of high-density and large-fineness tows.

[0022] 3. The hot air blower of the present invention blows hot air from the bottom to the top of the air outlet to act on the polylactic acid tow, and the negative pressure pump sucks from the top of the drying box, so as to effectively discharge the water vapor generated during the drying process and ensure the drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic structural diagram of the relative position distribution of the air outlet nozzle and the hot air blower in the present invention;

[0025] Figure 3This is a schematic diagram of the relative position distribution structure of the horizontal frame, elastic paddles and air outlet nozzles in the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the cross frame, the limit baffle and the linkage baffle in the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the roller and the wave-shaped chute in the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the linkage baffle, the rubbing bar and the linkage wheel in the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the linkage baffle and the limit baffle in the present invention;

[0030] Figure 8 It is a top view structural diagram of the coordinated arrangement of the linkage baffle, the rubbing bar and the linkage wheel in the present invention.

[0031] Description of reference numerals:

[0032] 1. Machine base; 2. Winding roller; 3. Hot air blower; 4. Feeding mechanism; 5. Drying box; 6. Negative pressure pump; 7. Electric telescopic rod; 8. Air outlet nozzle; 9. Conveyor roller; 10. Transition support frame; 11. Shaft frame; 12. Transverse guide rail; 13. Connecting guide sleeve; 14. Connecting guide rod; 15. Transverse frame; 16. Elastic paddle; 17. Limit baffle; 18. Connecting side panel; 19. Wave-type slide; 20. Card slot; 21. Roller; 22. Linkage baffle; 23. Rubbing bar; 24. Linkage wheel; 25. Connecting slide; 26. Limit spring. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0034] like Figures 1-8As shown, a polylactic acid tow processing and drying device includes a machine base 1 and a drying box 5. A feeding mechanism 4 for conveying polylactic acid tow is provided on one side of the machine base 1, and a winding roller 2 for winding the polylactic acid tow after drying is provided on the other side. The winding roller 2 is driven by a motor and rotates at a set speed. It should be noted that the polylactic acid tow is a continuous filament bundle with a tightly arranged "belt-like" or "bundle-like" structure, similar to a bundle of thin wires; the drying box 5 is provided between the feeding mechanism 4 and the winding roller 2, and is fixed Installed on the machine base 1, the drying box 5 is provided with openings on both sides, and conveying rollers 9 are installed in the openings. The conveying rollers 9 in each opening are in pairs and are driven to rotate by a motor. The drying equipment also includes a swinging hot air mechanism and a toggle mechanism. The swinging hot air mechanism is provided at the bottom of the drying box 5 and is used to blow hot air to the polylactic acid tow for drying. The top of the drying box 5 is provided with a negative pressure mechanism for sucking the air in the drying box 5. The negative pressure mechanism is convenient for sucking away the water vapor blown off the polylactic acid tow.

[0035] The toggle mechanism includes an elastic paddle 16 and a transverse reciprocating drive mechanism. Multiple elastic paddles 16 are arranged transversely. The elastic paddles 16 are used to insert between the silk threads of the polylactic acid bundle. The transverse reciprocating motion mechanism is used to drive the distributed elastic paddles 16 to reciprocate transversely, so that the elastic paddles 16 can push the polylactic acid bundle back and forth to spread it out, thereby improving the effect of hot air drying it.

[0036] In some embodiments, combined Figure 4 and Figure 5 As shown, the transverse reciprocating drive mechanism includes an electric telescopic rod 7, a reciprocating sliding connection and a transverse frame 15. The electric telescopic rod 7 is fixedly mounted on the top of the drying box 5, and the telescopic end of the electric telescopic rod 7 is vertically downward. The telescopic end of the electric telescopic rod 7 is connected to the transverse frame 15 through a reciprocating sliding connection. The elastic paddle 16 is fixedly connected to the bottom of the transverse frame 15. Limit baffles 17 are fixedly provided on the inner walls of both sides of the drying box 5, and the limit baffles 17 are aligned with the edges of the transverse frame 15. When the telescopic end of the electric telescopic rod 7 is extended downward, the transverse frame 15 is lowered accordingly. After falling to a certain position, it abuts against the limit baffle 17 and is blocked and cannot continue to fall. At this time, the telescopic end of the electric telescopic rod 7 continues to extend, which allows the reciprocating sliding connection to drive the transverse frame 15 to slide reciprocally horizontally. At this time, the elastic paddles 16 distributed on the transverse frame 15 are respectively inserted into the gaps between the tows at different positions, and due to the reciprocating motion of the transverse frame 15, the tows are spread out by the elastic paddles 16.

[0037] In some specific embodiments, the reciprocating sliding connection includes a connecting side plate 18 and a roller 21. The connecting side plate 18 is vertically fixedly connected to the horizontal frame 15 and is centrally arranged. The connecting side plate 18 can be symmetrically arranged in two groups front and back. The roller 21 is horizontally rotatably connected to the telescopic end of the electric telescopic rod 7 and is arranged through. The roller 21 can rotate by itself. A wave-like chute 19 is longitudinally opened on the connecting side plate 18. The wave-like chute 19 can be set to the corresponding number of sections according to actual needs. The end of the roller 21 slides and fits in the wave-like chute 19. The wave-like A central card slot 20 cooperating with a roller 21 is provided at one end of the chute 19 close to the electric telescopic rod 7. Before the horizontal frame 15 descends to the position of the limit baffle 17, the connecting side plate 18 and the horizontal frame 15 are hung on the telescopic end of the electric telescopic rod 7. At this time, the roller 21 is in the central card slot 20. It should be noted that each turning position of the wave-type chute 19 is transitioned through an arc segment. At the same time, in order to ensure that the horizontal frame 15 always maintains a horizontal position and moves up and down and laterally, limited guides are provided between the two sides of the horizontal frame 15 and the inner wall of the drying box 5.

[0038] The position limiting guide comprises a transverse guide rail 12, a connecting guide sleeve 13 and a connecting guide rod 14. The transverse guide rail 12 is fixedly connected to the inner top of the drying box 5 through a bracket. The connecting guide sleeve 13 is slidably connected to the transverse guide rail 12. The connecting guide rod 14 is vertically fixedly connected to the edge of the transverse frame 15 and slides through the corresponding connecting guide sleeve 13.

[0039] When the electric telescopic rod 7 is extended, the suspended cross frame 15 first descends, and the connecting guide rod 14 slides down relative to the connecting guide sleeve 13. When the edge of the cross frame 15 hits the limit baffle 17 and stops, as the telescopic end of the electric telescopic rod 7 continues to extend, it drives the rotatably connected roller 21 to descend. During the descending process of the roller 21, it squeezes the inner wall of the wave-like slide 19 and rolls along the wave-like slide 19. In this process, the inclined section of the wave-like slide 19 is squeezed to generate a lateral component force, thereby facilitating the cross frame 15 to slide laterally along the transverse guide rail 12 by relying on the connecting guide sleeve 13, and because the wave-like slide 19 twists and turns back and forth, it is convenient to realize the reciprocating lateral movement of the cross frame 15, driving the distributed elastic paddles 16 to spread the polylactic acid tow back and forth.

[0040] It should be noted that the elastic pick 16 is provided in a variety of specifications and at different heights. Based on actual usage, the elastic pick 16 of the corresponding height specification is selected and installed on the bottom of the horizontal frame 15 to ensure that when the horizontal frame 15 drops to the position of the limit baffle 17, the depth of the elastic pick 16 inserted into the polylactic acid bundle will not be too deep. At the same time, the elastic pick 16 is an ultra-thin plastic sheet, which is easy to bend, so as to avoid breaking the bundle during lateral movement.

[0041] In some embodiments, combined Figures 2 to 4 As shown, the swinging hot air mechanism includes an air outlet nozzle 8, a hot air blower 3, a rotating connector and a linkage mechanism. The air outlet nozzle 8 is arranged at the inner bottom of the drying box 5, and the port of the air outlet nozzle 8 faces upward. The air outlet nozzle 8 is rotatably connected to the inner bottom of the drying box 5 through a rotating connector. The polylactic acid bundle passes between the air outlet nozzle 8 and the elastic paddle 16. The hot air blower 3 is installed under the machine base 1. The air outlet nozzle 8 is connected to the air outlet end of the hot air blower 3 through a hose. It should be noted that the hot air blower 3 includes a fan part and an electric heating part. The fan part is driven to rotate by an electric motor or a motor to drive external air into the hot air blower 3, and then passes through the electric heating part. The electric heating part can be an electric heating component such as an electric heating wire or an electric heating plate to heat the passing air and then blow it to the polylactic acid bundle through the air outlet nozzle 8 for drying. The horizontal frame 15 that reciprocates laterally drives the air outlet nozzle 8 to swing back and forth through the linkage mechanism.

[0042] In other specific embodiments, the rotating connector includes a shaft frame 11, which is provided with two pieces and symmetrically distributed on both sides of the bottom of the air outlet nozzle 8. The shaft frame 11 is fixedly connected to the bottom of the drying box 5, and the bottom of the air outlet nozzle 8 is fixedly connected to a connecting shaft, and the two ends of the connecting shaft are respectively rotatably connected to the corresponding shaft frame 11. In order to ensure the initial position of the air outlet nozzle 8, a coil spring can be installed between the shaft frame 11 and the connecting shaft, and the connecting shaft is connected in cooperation with the linkage mechanism.

[0043] In some embodiments, combined Figure 4 and Figure 6 As shown, the linkage mechanism includes a linkage baffle 22, a connecting slide 25 and a rubbing mechanism. A connecting slide 25 is provided on the two limit baffles 17. There are two linkage baffles 22, which are respectively slidably connected to the corresponding connecting slides 25. A compressible limit spring 26 is also connected between the linkage baffle 22 and the corresponding connecting slide 25, and there is a certain distance between the side edge of the limit baffle 17 close to the horizontal frame 15 and the linkage baffle 22 to ensure that the horizontal frame 15 first contacts the surface of the limit baffle 17 after it descends; there are two groups of rubbing mechanisms, and each linkage baffle 22 is connected to the connecting shaft through the corresponding rubbing mechanism.

[0044] Among them, the two groups of rubbing mechanisms are symmetrically distributed around the center, and each group of rubbing mechanisms includes a linkage wheel 24 and a rubbing bar 23. The two ends of the connecting shaft are coaxially fixedly connected to the linkage wheel 24 respectively, and the two linkage baffles 22 are fixedly connected to the rubbing bar 23 respectively through the connecting frame. The rubbing bar 23 and the linkage wheel 24 cooperate with each other. Specifically, the initial position of the rubbing bar 23 is obliquely below the corresponding linkage wheel 24, and they do not contact each other, and the rubbing bar 23 is tangent to the bottom of the corresponding linkage wheel 24. Here, the surface of the rubbing bar 23 and the surface of the linkage wheel 24 are distributed with anti-slip grooves, and the rubbing bar 23 and the linkage wheel 24 can also be replaced with gears and racks.

[0045] When the horizontal frame 15 drops to the limit baffle 17 and cannot continue to drop and slides back and forth horizontally, the horizontal frame 15 will push the linkage baffles 22 on both sides in turn. When the horizontal frame 15 slides to one side, the corresponding linkage baffle 22 slides along the corresponding connecting groove 25 and compresses the corresponding limit spring 26. In this process, the linkage baffle 22 drives the corresponding rubbing bar 23 to move horizontally through the bottom of the corresponding linkage wheel 24 through the connecting frame. The linkage wheel 24 rotates under the action of friction, so that the connecting shaft drives the air outlet nozzle 8 to deflect to one side. When the horizontal frame 15 slides to the other side, When it contacts the corresponding linkage baffle 22 on the other side, the rubbing bar 23 on the other side acts on the corresponding linkage wheel 24, so that the air outlet nozzle 8 is deflected to the other side, and this is repeated to achieve reciprocating swing of the air outlet nozzle 8 at a certain angle. The swinging causes the hot air to blow into the gap between the tows from different angles, breaking the static laminar boundary layer, forcing the airflow to penetrate deep into the fiber, and reducing the "airflow shielding" effect; the non-steady-state airflow generated by the swinging enhances convective heat transfer and accelerates the diffusion of moisture from the fiber surface to the air; it effectively improves the drying efficiency of the polylactic acid tow, and is especially suitable for the production of high-density and large-fineness tows.

[0046] In some specific embodiments, in order to facilitate the passage of the polylactic acid filament bundle between the elastic paddle 16 and the air outlet nozzle 8, a transition support frame 10 is provided between the air outlet nozzle 8 and the elastic paddle 16. The transition support frame 10 is fixedly connected to the inner wall of the drying box 5. The polylactic acid filament bundle does not need to be straightened and tightened during the traction and transmission process, and a certain degree of slack can be maintained so that it can pass through the transition support frame 10. At the same time, it is also beneficial for the elastic paddle 16 to spread the filament bundle apart.

[0047] In some specific embodiments, the negative pressure mechanism includes a negative pressure pump 6, which is fixedly installed on the top of the drying box 5. A suction pipe is installed at the negative pressure end of the negative pressure pump 6, and the suction pipe is connected to the top of the drying box 5. The output end of the negative pressure pump 6 can be connected to other containers for water vapor treatment through a pipeline or discharged to the external space. The water vapor blown down from the polylactic acid filament bundle is sucked away by the suction of the negative pressure pump 6.

[0048] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution is briefly described in conjunction with specific application scenarios:

[0049] The conveyor rollers 9 on both sides of the drying box 5 rotate to convey the continuous polylactic acid tow through the entire drying box 5. During the passage, the hot air blower 3 generates hot air and blows it upwards through the air outlet 8, so that the hot air passes through the tow to achieve drying. The negative pressure pump 6 draws suction from the top of the drying box 5 to absorb the blown water vapor for treatment;

[0050] In addition, during the process of the polylactic acid tow passing through the drying oven 5, the electric telescopic rod 7 is continuously extended and retracted. When the electric telescopic rod 7 is extended, the suspended horizontal frame 15 first drops. During this process, the connecting guide rod 14 slides down relative to the connecting guide sleeve 13. When the edge of the horizontal frame 15 hits the limit baffle 17 and stops, the distributed elastic paddles 16 are inserted between the tows. Then, as the telescopic end of the electric telescopic rod 7 continues to extend, it drives the rotating connected roller 21 to drop. During the descending process of the roller 21, its squeezing action acts on the inner wall of the wave-type chute 19. , and rolls along the wavy chute 19. During this process, the inclined section of the wavy chute 19 is squeezed to generate a lateral component of force, which makes it easy to drive the transverse frame 15 to slide laterally along the transverse guide rail 12 by relying on the connecting guide sleeve 13, and because the wavy chute 19 twists and turns back and forth, it is easy to realize the reciprocating lateral movement of the transverse frame 15, driving the distributed elastic paddles 16 to spread out the polylactic acid tow back and forth, so that the hot air blown out by the air outlet nozzle 8 can effectively pass through the spread out tow, which is convenient for effectively drying the deep position of the tow and improving the drying efficiency.

[0051] When the horizontal frame 15 slides horizontally, the horizontal frame 15 will push the linkage baffles 22 on both sides in turn. When the horizontal frame 15 slides to one side, the corresponding linkage baffle 22 slides along the corresponding connecting groove 25 and compresses the corresponding limit spring 26. In this process, the linkage baffle 22 drives the corresponding rubbing bar 23 to move horizontally through the bottom of the corresponding linkage wheel 24 through the connecting frame. The linkage wheel 24 rotates under the action of friction, so that the connecting shaft drives the air outlet nozzle 8 to deflect to one side. When the horizontal frame 15 slides to the other side, it contacts the corresponding When the baffle 22 is linked, the rubbing bar 23 on the other side acts on the corresponding linkage wheel 24, so that the air outlet nozzle 8 is deflected to the other side, and this is repeated to achieve the reciprocating swing of the air outlet nozzle 8 at a certain angle. The swinging causes hot air to blow into the gap between the tows from different angles, breaking the static laminar boundary layer, forcing the airflow to penetrate deep into the fiber, and reducing the "airflow shielding" effect; the non-steady-state airflow generated by the swing enhances convective heat transfer and accelerates the diffusion of moisture from the fiber surface to the air; it effectively improves the drying efficiency of the polylactic acid tow, and is especially suitable for the production of high-density and large-fineness tows.

[0052] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A polylactic acid tow processing and drying device, comprising a machine base (1) and a drying box (5), characterized in that: Also includes: A swinging hot air mechanism is provided at the bottom of the drying box (5) for blowing hot air toward the polylactic acid filament bundle, and a negative pressure mechanism is provided at the top of the drying box (5) for sucking air from the drying box (5); A toggle mechanism comprises an elastic paddle (16) and a transverse reciprocating drive mechanism, wherein a plurality of elastic paddles (16) are arranged transversely, the elastic paddles (16) are used to be inserted between the threads of the polylactic acid tow, and the transverse reciprocating motion mechanism is used to drive the distributed elastic paddles (16) to perform transverse reciprocating motion.

2. The polylactic acid tow processing and drying equipment according to claim 1, characterized in that: The horizontal reciprocating drive mechanism comprises an electric telescopic rod (7), a reciprocating sliding connection and a transverse frame (15); the electric telescopic rod (7) is fixedly mounted on the top of the drying box (5); the telescopic end of the electric telescopic rod (7) is connected to the transverse frame (15) via the reciprocating sliding connection; the elastic paddle (16) is fixedly connected to the bottom of the transverse frame (15); and limit baffles (17) are fixedly provided on the inner walls of both sides of the drying box (5), and the limit baffles (17) are aligned with the edges of the transverse frame (15).

3. The polylactic acid tow processing and drying equipment according to claim 2, characterized in that: The reciprocating sliding connection comprises a connecting side plate (18) and a roller (21), wherein the connecting side plate (18) is vertically fixedly connected to the transverse frame (15), and the roller (21) is horizontally rotatably connected to the telescopic end of the electric telescopic rod (7). A wave-shaped chute (19) is longitudinally provided on the connecting side plate (18), and the end of the roller (21) is slidably fitted and inserted into the wave-shaped chute (19). Limiting guides are provided between both sides of the transverse frame (15) and the inner wall of the drying box (5).

4. The polylactic acid tow processing and drying equipment according to claim 3, characterized in that: The position limiting guide comprises a transverse guide rail (12), a connecting guide sleeve (13) and a connecting guide rod (14); the transverse guide rail (12) is fixedly connected to the inner top of the drying box (5); the connecting guide sleeve (13) is slidably connected to the transverse guide rail (12); the connecting guide rod (14) is vertically fixedly connected to the edge of the transverse frame (15), and the connecting guide rod (14) slides through the corresponding connecting guide sleeve (13).

5. The polylactic acid tow processing and drying equipment according to claim 2, characterized in that: The swing-type hot air mechanism comprises an air outlet nozzle (8), a hot air blower (3), a rotating connector and a linkage mechanism. The air outlet nozzle (8) is arranged at the inner bottom of the drying box (5). The air outlet nozzle (8) is rotatably connected to the inner bottom of the drying box (5) through the rotating connector. The hot air blower (3) is installed below the machine base (1). The air outlet nozzle (8) is connected to the air outlet end of the hot air blower (3) through a hose. The horizontal frame (15) that reciprocates laterally drives the air outlet nozzle (8) to swing back and forth through the linkage mechanism.

6. The polylactic acid tow processing and drying equipment according to claim 5, characterized in that: The rotating connecting member includes an axis frame (11), and the axis frame (11) is provided with two pieces and symmetrically distributed on both sides of the bottom of the air outlet nozzle (8). The bottom of the air outlet nozzle (8) is fixedly connected with a connecting shaft, and the two ends of the connecting shaft are respectively rotatably connected to the corresponding axis frame (11), and the connecting shaft is cooperatively connected with the linkage mechanism.

7. The polylactic acid tow processing and drying equipment according to claim 6, characterized in that: The linkage mechanism comprises a linkage baffle (22), a connecting slide (25) and a rubbing mechanism. The two limit baffles (17) are both provided with a connecting slide (25). There are two linkage baffles (22) and they are respectively slidably connected to the corresponding connecting slides (25). A limiting spring (26) is further connected between the linkage baffle (22) and the corresponding connecting slide (25). There are two groups of rubbing mechanisms. Each linkage baffle (22) is respectively connected to the connecting shaft through the corresponding rubbing mechanism.

8. The polylactic acid tow processing and drying equipment according to claim 7, characterized in that: The two groups of rubbing mechanisms are centrally symmetrically distributed. Each group of rubbing mechanisms comprises a linkage wheel (24) and a rubbing bar (23). The two ends of the connecting shaft are coaxially fixedly connected to the linkage wheel (24). The two linkage baffles (22) are fixedly connected to the rubbing bar (23). The rubbing bar (23) and the linkage wheel (24) are matched with each other.

9. The polylactic acid tow processing and drying equipment according to claim 5, characterized in that: A transition support frame (10) is provided between the air outlet nozzle (8) and the elastic paddle (16), and the transition support frame (10) is fixedly connected to the inner wall of the drying box (5).

10. The polylactic acid tow processing and drying equipment according to claim 1, characterized in that: The negative pressure mechanism comprises a negative pressure pump (6), which is fixedly mounted on the top of the drying box (5); a suction pipe is mounted on the negative pressure end of the negative pressure pump (6), and the suction pipe is connected to the top of the drying box (5).

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