A fiber spinning, drawing and winding device for polylactic acid industry

Abstract

The present invention discloses a polylactic acid industrial fiber spinning stretching and winding device, which relates to the field of spinning production technology and solves the technical problem of the difficulty of deflection of polylactic acid tow when entering the stretching and winding device in the related technology. The stretching and winding device includes a double-sided oiling mechanism, a shearing and sucking wire, a pre-network device and a wire separation roller arranged in sequence according to the production process. The stretching and winding device is equipped with a spinning device. The tow passes through the double-sided oiling mechanism, the shearing and sucking wire and the pre-network device in sequence from the spinning device until it is transmitted to the wire separation roller. The stretching and winding device and the spinning device are configured in parallel so that the tow between the spinning device and the wire separation roller is arranged in a vertical direction and tangent to the wire separation roller. Under this parallel arrangement, the tow does not deflect after being drawn out from the spinning device and entering the stretching and winding device, thereby avoiding friction caused by high deflection and damaging the tow. It is particularly used in the production of polylactic acid industrial fiber FDY spinning.

Description

Technical Field

[0001] The invention relates to the technical field of spinning production, and in particular to a fiber spinning, drawing and winding device for polylactic acid industry. Background Art

[0002] Most of the existing polylactic acid industrial fiber filament spinning, drawing and winding equipment are modified from other types of equipment. The biggest disadvantage is that the product quality and performance are unstable.

[0003] Bio-based polylactic acid tow is relatively fragile compared to petroleum synthetic fibers. In order to avoid damage due to strong deflection and entanglement and to avoid different physical properties, the deflection of the thread must not exceed certain limit values. Summary of the invention

[0004] The present application provides a polylactic acid industrial fiber spinning, stretching and winding device, which solves the technical problem in the related art that polylactic acid filament bundles are difficult to deflect when entering the stretching and winding device.

[0005] The present application provides a polylactic acid industrial fiber spinning stretching and winding device, comprising a double-sided oiling mechanism, shearing and sucking wires, a pre-network device and a filament separation roller which are arranged in sequence according to the production process; the stretching and winding device is matched with a spinning device; the filament bundle passes through the double-sided oiling mechanism, the shearing and sucking wires and the pre-network device in sequence from the spinning device until it is transmitted to the filament separation roller; the stretching and winding device and the spinning device are configured in parallel so that the filament bundle between the spinning device and the filament separation roller is arranged in a vertical direction and is tangent to the filament separation roller.

[0006] Optionally, the selection of the wire separation roller includes a tension wire separation roller pair or a feeding roller.

[0007] Optionally, the drafting and winding device includes a double-sided oiling mechanism, a shearing and sucking wire, a pre-network device, a wire separation roller, a first pair of low-temperature hot rollers, a second pair of high-temperature drafting hot rollers, a third pair of high-temperature drafting hot rollers, a fourth pair of drafting and shaping hot rollers, and a fifth shaping hot roller group, which are arranged in sequence according to the production process;

[0008] The fifth hot roller group includes:

[0009] The insulation cover box is provided with an inlet and outlet passage for the yarn tow to pass through.

[0010] At least four heat setting rollers are arranged in sequence according to the production process, and are all arranged inside the heat preservation cover box;

[0011] The heating source is used to heat the filament bundle in the heat preservation box at 70-120°C.

[0012] Optionally, the fifth heat setting roller group includes four heat setting rollers, which are respectively a first heat setting roller, a second heat setting roller, a third heat setting roller and a fourth heat setting roller which are sequentially arranged according to the production process, and the filament bundle passes through the inlet wire path and sequentially winds around the first heat setting roller, the second heat setting roller, the third heat setting roller and the fourth heat setting roller until passing through the outlet wire path;

[0013] The first heat setting roller is arranged higher than the second heat setting roller, the third heat setting roller is at the same height as the first heat setting roller, and the fourth heat setting roller is at the same height as the second heat setting roller.

[0014] Optionally, the heating source includes an induction heating source, a steam heating source or a hot air heating source;

[0015] When the heating source includes an inductive heating source, it is used to heat-set the polylactic acid industrial fiber spinning with a setting temperature in the first preset range, and the heat-setting rollers are all configured as inductive heating setting hot rollers;

[0016] When the heating source includes a steam heating source, it is used to heat-set the polylactic acid industrial fiber spinning with a setting temperature within the second preset range, a steam inlet is opened at a lower part of the side wall of the insulation cover box, a steam outlet is opened at a higher part of the side wall of the insulation cover box, the steam inlet and the steam outlet are opened on opposite sides of the insulation cover box, and the steam heating source is used to transport hot steam into the insulation cover box;

[0017] When the heating source includes a hot air heating source, it is used to heat-set the polylactic acid industrial fiber spinning with a setting temperature in a third preset range, and a plurality of heating plates are arranged in the heat-insulating cover box, the heating plates are arranged at intervals from the heat-setting rollers, and the heating plates are arranged close to the filament bundles in the heat-insulating cover box;

[0018] The first preset range, the second preset range, and the third preset range decrease in sequence, and are all greater than or equal to 70° C. and less than or equal to 120° C.

[0019] Optionally, the first preset range is greater than 110° C. and less than or equal to 120° C.;

[0020] The second preset range is greater than 90°C and less than or equal to 110°C;

[0021] The third preset range is greater than or equal to 70° C. and less than or equal to 90° C.

[0022] Optionally, the stretching and winding device also includes a sixth relaxation guide plate, a porcelain wire guide hook, a main network device and a winding machine which are arranged in sequence according to the production process after the fifth shaping hot roller group.

[0023] Optionally, the filament separation roller is wound with the filament bundle for one turn, the heating temperature of the filament separation roller is zero, and the spinning speed is 550-650 m / min;

[0024] The first pair of low-temperature hot rollers are wound around the filament bundle for 6.5 to 7.5 turns, the heating temperature of the first pair of low-temperature hot rollers is 65-90°C, the spinning speed is 605m / min, and the speed ratio between the filament separator roller and the first pair of low-temperature hot rollers is 1:1.01;

[0025] The second pair of high-temperature drafting hot rollers are wound around the tow for 6.5 to 7.5 turns, the heating temperature of the second pair of high-temperature drafting hot rollers is 100-140°C, the spinning speed is 1950m / min, and the drafting multiple of the first pair of low-temperature hot rollers and the second pair of high-temperature drafting hot rollers is 2.5-3.5 times;

[0026] The third pair of high-temperature drafting hot rollers are wound around the tow for 6.5 to 7.5 turns, the heating temperature of the third pair of high-temperature drafting hot rollers is 110-150°C, the spinning speed is 3500m / min, and the drafting multiples of the second pair of high-temperature drafting hot rollers and the third pair of high-temperature drafting hot rollers are 1.5-2 times;

[0027] The fourth pair of drawing and shaping hot rollers are wound around the tow for 6.5 to 7.5 turns, the heating temperature of the fourth pair of drawing and shaping hot rollers is 110-150°C, the spinning speed is 3900m / min, and the drawing multiples of the third pair of high-temperature drawing hot rollers and the fourth pair of drawing and shaping hot rollers are 1.1-1.3 times;

[0028] The heating temperature of the fifth shaping hot roller group is 70-120° C., the spinning speed is 4250 m / min, and the drafting multiples of the fourth pair of drawing shaping hot rollers and the fifth shaping hot roller group are 1.02-1.05 times.

[0029] Optionally, the heating temperature of the sixth relaxation guide disc is zero, and the roller shell surface of the sixth relaxation guide disc is set to ceramic.

[0030] Optionally, the roller shell surfaces of the filament separation roller, the first pair of low-temperature hot rollers, the second pair of high-temperature drawing hot rollers, the third pair of high-temperature drawing hot rollers, the fourth pair of drawing and shaping hot rollers and the fifth shaping hot roller group are all made of ceramics.

[0031] The beneficial effects of the present application are as follows: The present application provides a polylactic acid industrial fiber spinning stretching and winding device, in which the filament bundle enters the stretching and winding device through the spinning device. The present application adopts a parallel configuration in the equipment layout of the spinning device and the stretching and winding device. Specifically, the filament bundle passes through the double-sided oiling mechanism, the shearing and suction wires and the pre-network device in sequence from the spinning device until it is transmitted to the filament separation roller, so that the filament bundle between the spinning device and the filament separation roller is arranged in a vertical direction and tangent to the filament separation roller. Under this parallel arrangement, the filament bundle does not deflect after being drawn out from the spinning device and entering the stretching and winding device, thereby avoiding friction caused by high deflection and damaging the filament bundle. It is particularly used in the production of polylactic acid industrial fiber FDY spinning. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0033] Figure 1 A front view of a polylactic acid industrial fiber spinning, stretching and winding device and a spinning device provided in this application;

[0034] Figure 2 for Figure 1 a side view of the structure shown;

[0035] Figure 3 for Figure 1 Schematic diagram of the partial structure of the middle draft winding device;

[0036] Figure 4 for Figure 3 a side view of the structure shown;

[0037] Figure 5 for Figure 1 A side view of the fifth hot roller group for setting the shape;

[0038] Figure 6 for Figure 1 The front view of the fifth setting hot roller group using induction heating source;

[0039] Figure 7 for Figure 1 The front view of the fifth setting hot roller group using steam heating source;

[0040] Figure 8 for Figure 1 The front view of the fifth shaping hot roller group using hot air heating source.

[0041] The accompanying drawings are marked with: 100-spinning device, 200-drawing and winding device, 11-double-sided oiling mechanism, 12-cutting and sucking wire, 13-pre-network device, 14-wire separation roller, 15-first pair of low-temperature hot rollers, 16-second pair of high-temperature drawing hot rollers, 17-third pair of high-temperature drawing hot rollers, 18-fourth pair of drawing and shaping hot rollers, 19-fifth shaping hot roller group, 19-1-first heat setting roller, 19-2-second heat setting roller, 19-3-third heat setting roller, 19-4-fourth heat setting roller, 19-5-insulation cover box, 19-5a-steam inlet, 19-5b-steam outlet, 19-6-wire inlet channel, 19-7-filament bundle, 19-8-wire outlet channel, 19-9-heating plate, 20-sixth relaxation guide disk, 21-ceramic wire guide hook, 22-main network device, 23-winding machine. DETAILED DESCRIPTION

[0042] The embodiment of the present application solves the technical problem in the related art that polylactic acid filament bundles are difficult to deflect when entering the stretching and winding device by providing a polylactic acid industrial fiber spinning stretching and winding device.

[0043] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0044] A polylactic acid industrial fiber spinning stretching and winding device comprises a double-sided oiling mechanism, a shearing and sucking wire, a pre-network device and a filament separation roller which are arranged in sequence according to the production process; the stretching and winding device is matched with a spinning device; the filament bundle passes through the double-sided oiling mechanism, the shearing and sucking wire and the pre-network device in sequence from the spinning device until it is transmitted to the filament separation roller; the stretching and winding device and the spinning device are arranged in parallel so that the filament bundle between the spinning device and the filament separation roller is arranged in a vertical direction and is tangent to the filament separation roller.

[0045] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] Example 1

[0047] Please refer to Figures 1 to 3 This embodiment discloses a polylactic acid industrial fiber spinning stretching and winding device 200, comprising a double-sided oiling mechanism 11, a shearing and sucking filament 12, a pre-network device 13 and a separation roller 14 arranged in sequence according to the production process. The stretching and winding device 200 is matched with the spinning device 100 to form a combined machine. The filament bundle passes through the double-sided oiling mechanism 11, the shearing and sucking filament 12 and the pre-network device 13 from the spinning device 100 in sequence until it is transmitted to the separation roller 14. The stretching and winding device 200 and the spinning device 100 are configured in parallel, that is, the spinning device 100 and the stretching and winding device 200 are arranged in parallel in the equipment layout, so that the filament bundle between the spinning device 100 and the separation roller 14 is arranged in a vertical direction and tangent to the separation roller 14. In this parallel arrangement, the filament bundle is not deflected after being drawn out from the spinning device 100 and entering the drafting and winding device 200, thereby avoiding friction caused by high deflection and damaging the filament bundle, which is particularly used in the production of polylactic acid industrial fiber FDY spinning.

[0048] Optionally, the wire separation roller 14 can be selected as a tension wire separation roller or a feeding roller. When the wire separation roller 14 is selected as a tension wire separation roller, it is beneficial to space arrangement and cost saving. When the wire separation roller 14 is selected as a feeding roller, it has a certain grip on the wire, which is convenient for wire separation.

[0049] Optionally, see Figure 3 and Figure 4The stretching and winding device 200 includes a double-sided oiling mechanism 11, a shearing and sucking wire 12, a pre-network device 13, a wire separation roller 14, a first pair of low-temperature hot rollers 15, a second pair of high-temperature stretching hot rollers 16, a third pair of high-temperature stretching hot rollers 17, a fourth pair of stretching and shaping hot rollers 18 and a fifth shaping hot roller group 19 which are arranged in sequence according to the production process.

[0050] Unlike other types of spinning such as polyester, polylactic acid is heated to a certain temperature, the molecular structure of the fiber changes, and then it is shaped. Due to the characteristics of polylactic acid fiber, the shaping of polylactic acid industrial fiber spinning is still imperfect, and requires higher shaping length and shaping time.

[0051] Please combine Figure 6 In this embodiment, the fifth hot setting roller group 19 includes a heat preservation box 19-5, a heating source and at least four heat setting rollers. The heat preservation box 19-5 is provided with an inlet wire path 19-6 and an outlet wire path 19-8 for the yarn bundle 19-7 to pass through. At least four heat setting rollers are arranged in sequence according to the production process and are all installed in the heat preservation box 19-5. The heating source is used to heat the yarn bundle 19-7 in the heat preservation box 19-5 at 70-120°C.

[0052] The above-mentioned specific method of replacing a traditional pair of setting rollers with the fifth setting hot roller group 19, by increasing the number of heat setting rollers and arranging the heat setting rollers in the heat preservation cover box 19-5, by increasing the path in a limited space and increasing the spinning distance, is beneficial to the strict requirements on the setting length and setting time when spinning polylactic acid, and can make the setting effect more sufficient.

[0053] The speeds of the various heat setting rollers of the fifth setting hot roller group 19 can be adjusted separately, which is beneficial for regulating the setting step.

[0054] Among them, the fifth shaping hot roller group 19 needs to ensure that the filament bundle 19-7 enters the insulation box 19-5 in an upward direction and is output downward. Therefore, the number of heat shaping rollers in the insulation box 19-5 is preferably controlled at 4, and 6, 8, etc. can also be set.

[0055] Optionally, see Figure 5 and Figure 6 The fifth heat setting roller group 19 includes four heat setting rollers, namely the first heat setting roller 19-1, the second heat setting roller 19-2, the third heat setting roller 19-3 and the fourth heat setting roller 19-4 which are arranged in sequence according to the production process. The filament bundle 19-7 passes through the inlet wire path 19-6 and passes through the first heat setting roller 19-1, the second heat setting roller 19-2, the third heat setting roller 19-3 and the fourth heat setting roller 19-4 in sequence until it passes through the outlet wire path 19-8. Figure 6As shown, the first heat setting roller 19-1 is arranged higher than the second heat setting roller 19-2, the third heat setting roller 19-3 is at the same height as the first heat setting roller 19-1, and the fourth heat setting roller 19-4 is at the same height as the second heat setting roller 19-2.

[0056] Optionally, the heating source includes an induction heating source, a steam heating source or a hot air heating source.

[0057] like Figure 6 As shown, when the heating source includes an inductive heating source, it is used to heat-set the polylactic acid industrial fiber spinning with a setting temperature in the first preset range, and the heat setting rollers are all set as inductive heating setting hot rollers. Inductive heating setting is relatively uniform in heating, but it consumes more electricity and has a higher cost. It is used for bio-based polylactic acid industrial filaments with higher setting temperatures, which have relatively high requirements for various indicators.

[0058] like Figure 7 As shown, when the heating source includes a steam heating source, it is used to heat-set the polylactic acid industrial fiber spinning with a setting temperature within a second preset range. A steam inlet 19-5a is opened at a lower part of the side wall of the insulation box 19-5, and a steam outlet 19-5b is opened at a higher part of the side wall of the insulation box 19-5. The steam inlet 19-5a and the steam outlet 19-5b are opened on opposite sides of the insulation box 19-5. The steam heating source is used to transport hot steam into the insulation box 19-5, specifically, it is input into the insulation box 19-5 through the steam inlet 19-5a, and output from the steam outlet 19-5b after the filament bundle 19-7 is heat-set.

[0059] like Figure 8 As shown, when the heating source includes a hot air heating source, it is used to heat-set the polylactic acid industrial fiber spinning with a setting temperature in the third preset range, and a plurality of heating plates 19-9 are arranged in the heat-insulating cover box 19-5. The heating plates 19-9 are arranged at intervals from the heat-setting rollers, and the heating plates 19-9 are arranged close to the filament bundle 19-7 in the heat-insulating cover box 19-5. The temperature can be controlled by heating and setting with the heating plates 19-9.

[0060] Due to the properties of polylactic acid fiber, its shaping temperature is generally required to be no more than 120°C and no less than 70°C. In one feasible implementation plan, the first preset range, the second preset range, and the third preset range are reduced in sequence, and are all greater than or equal to 70°C and less than or equal to 120°C. As the shaping temperature decreases, the induction heating source, steam heating source, or hot air heating source are selected in sequence.

[0061] Optionally, the first preset range is greater than 110° C. and less than or equal to 120° C., the second preset range is greater than 90° C. and less than or equal to 110° C., and the third preset range is greater than or equal to 70° C. and less than or equal to 90° C.

[0062] Optionally, the polylactic acid industrial filaments with a setting temperature of 110° C. to 120° C. are set by induction heating.

[0063] Optionally, the polylactic acid industrial filaments having a setting temperature of 95° C. to 105° C. are set by steam heating.

[0064] Optionally, hot air setting is used for the polylactic acid industrial filaments with a setting temperature of 70°C to 90°C.

[0065] Alternatively, if Figure 8 As shown, in the hot air heating setting, the heating plate 19-9 includes a type arranged at the entrance of the heat preservation cover box 19-5, and another type arranged between the subsequent heat setting rollers. Since the temperature change at the entrance position, that is, the area after the wire path 19-6, is relatively large, the wire bundle 19-7 is arranged through the heating plate 19-9 at the entrance, and the cross section of the corresponding heating plate 19-9 is arranged in a U shape. The subsequent heating plate 19-9 is arranged between the two heat setting rollers, which is conducive to the spatial arrangement in the heat preservation cover box 19-5 and the smaller specification of the heat preservation cover box 19-5.

[0066] Alternatively, if Figure 1 and Figure 3 As shown, the drafting and winding device 200 also includes a sixth slackening guide disc 20, a ceramic wire guide hook 21, a main network device 22 and a winding machine 23 which are sequentially arranged after the fifth setting hot roller group 19 according to the production process. The sixth slackening guide disc 20 plays the role of slackening and eliminating tension. After the tow is wound on the sixth slackening guide disc 20, it is sent to the main network device 22 for knotting through the ceramic wire guide hook 21. After the tow is knotted, it is sequentially sent to the winding machine 23 to complete winding.

[0067] The polylactic acid industrial fiber spinning, drawing and winding device 200 of this embodiment can produce 4 to 16 different varieties of bio-based polylactic acid industrial filaments.

[0068] Example 2

[0069] Based on a polylactic acid industrial fiber spinning, stretching and winding device 200 according to Example 1, this embodiment sets specific parameters of the filament separation roller 14, the first pair of low-temperature hot rollers 15, the second pair of high-temperature stretching hot rollers 16, the third pair of high-temperature stretching hot rollers 17, the fourth pair of stretching and shaping hot rollers 18 and the fifth shaping hot roller group 19.

[0070] Specifically, the filament separation roller 14 is wound with the filament bundle for one circle, the heating temperature of the filament separation roller 14 is zero, and the spinning speed is 550-650 m / min in the non-heating state.

[0071] The first pair of low-temperature hot rollers 15 are wound around the filament bundle for 6.5 to 7.5 turns, the heating temperature of the first pair of low-temperature hot rollers 15 is 65-90°C, the spinning speed is 605m / min, and the filament separation roller 14 and the first pair of low-temperature hot rollers 15 maintain a speed ratio of 1:1.01.

[0072] The second pair of high temperature drawing hot rollers 16 are wrapped around the filament bundle for 6.5 to 7.5 turns, the heating temperature of the second pair of high temperature drawing hot rollers 16 is 100-140°C, the spinning speed is 1950m / min, and the drawing multiples of the first pair of low temperature hot rollers 15 and the second pair of high temperature drawing hot rollers 16 are 2.5-3.5 times.

[0073] The third pair of high-temperature drawing hot rollers 17 are wound around the filament bundle for 6.5 to 7.5 turns, the heating temperature of the third pair of high-temperature drawing hot rollers 17 is 110-150°C, the spinning speed is 3500m / min, and the drawing multiples of the second pair of high-temperature drawing hot rollers 16 and the third pair of high-temperature drawing hot rollers 17 are 1.5-2 times.

[0074] The fourth pair of drawing and shaping hot rollers 18 are wrapped around the filament bundle for 6.5 to 7.5 turns, the heating temperature of the fourth pair of drawing and shaping hot rollers 18 is 110-150°C, the spinning speed is 3900m / min, and the drawing multiples of the third pair of high-temperature drawing and shaping hot rollers 17 and the fourth pair of drawing and shaping hot rollers 18 are 1.1-1.3 times.

[0075] The heating temperature of the fifth shaping hot roller group 19 is 70-120° C., the spinning speed is 4250 m / min, and the drafting multiples of the fourth pair of drawing shaping hot rollers 18 and the fifth shaping hot roller group 19 are 1.02-1.05 times.

[0076] Optionally, the heating temperature of the sixth relaxation guide plate 20 is zero, which is a non-heating state.

[0077] Optionally, the roller shell surfaces of the filament separation roller 14, the first pair of low-temperature hot rollers 15, the second pair of high-temperature drawing hot rollers 16, the third pair of high-temperature drawing hot rollers 17, the fourth pair of drawing and shaping hot rollers 18, the fifth shaping hot roller group 19 and the sixth relaxation guide plate 20 can all be made of ceramic.

[0078] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0079] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A polylactic acid industrial fiber spinning, drawing and winding device, characterized in that: The drafting and winding device comprises a double-sided oiling mechanism, a shearing and sucking wire, a pre-network device, a wire-separating roller, a first pair of low-temperature hot rollers, a second pair of high-temperature drafting hot rollers, a third pair of high-temperature drafting hot rollers, a fourth pair of drafting and shaping hot rollers, and a fifth shaping hot roller group, which are arranged in sequence according to the production process. The drafting and winding device is equipped with a spinning device. The filament bundle passes through the double-sided oiling mechanism, the shearing and sucking wire, and the pre-network device in sequence from the spinning device until it is transmitted to the wire-separating roller. The filament bundle is a bio-based polylactic acid filament bundle. The selection of the wire-separating roller includes a tension wire-separating roller pair or a feeding roller. The drafting and winding device and the spinning device are arranged in parallel so that the filament bundle between the spinning device and the filament separation roller is arranged in a vertical direction and tangential to the filament separation roller, so that the filament bundle led from the spinning device to the filament separation roller is not deflected; The fourth pair of drawing and shaping hot rollers and the fifth shaping hot roller group are used together to shape the filament bundle; The fifth hot roller group comprises: The heat-insulating cover box is provided with a wire inlet and a wire outlet for the wire bundle to pass through. At least four heat setting rollers are arranged in sequence according to the production process, and are all arranged inside the heat preservation cover box; A heating source, used to heat the filament bundle in the heat preservation box at 70-120°C; The heating source includes an induction heating source, a steam heating source or a hot air heating source; When the heating source includes the induction heating source, it is used to heat-set the polylactic acid industrial fiber spinning with a setting temperature within the first preset range, and the heat-setting rollers are all induction heating setting hot rollers; When the heating source includes the steam heating source, it is used to heat-set the polylactic acid industrial fiber spinning with a setting temperature within the second preset range, a steam inlet is opened at a lower part of the side wall of the insulation cover box, and a steam outlet is opened at a higher part of the side wall of the insulation cover box, the steam inlet and the steam outlet are opened on opposite sides of the insulation cover box, and the steam heating source is used to transport hot steam into the insulation cover box; When the heating source includes the hot air heating source, it is used to heat-set the polylactic acid industrial fiber spinning with a setting temperature in a third preset range, and a plurality of heating plates are arranged in the heat-insulating cover box, the heating plates are arranged at intervals from the heat-setting rollers, and the heating plates are arranged close to the filament bundles in the heat-insulating cover box; The first preset range is greater than 110° C. and less than or equal to 120° C., the second preset range is greater than 90° C. and less than or equal to 110° C., and the third preset range is greater than or equal to 70° C. and less than or equal to 90° C.

2. The polylactic acid industrial fiber spinning, drawing and winding device according to claim 1, characterized in that: The fifth heat setting roller group includes four heat setting rollers, which are respectively a first heat setting roller, a second heat setting roller, a third heat setting roller and a fourth heat setting roller which are sequentially arranged according to the production process. The filament bundle passes through the inlet wire path and sequentially winds around the first heat setting roller, the second heat setting roller, the third heat setting roller and the fourth heat setting roller until passing through the outlet wire path. The first heat setting roller is arranged higher than the second heat setting roller, the third heat setting roller is at the same height as the first heat setting roller, and the fourth heat setting roller is at the same height as the second heat setting roller.

3. The polylactic acid industrial fiber spinning, drawing and winding device according to claim 1, characterized in that: The drafting and winding device also includes a sixth relaxation guide plate, a porcelain wire guide hook, a main network device and a winding machine which are arranged in sequence according to the production process after the fifth shaping hot roller group.

4. The polylactic acid industrial fiber spinning, drawing and winding device according to claim 1, characterized in that: The filament separation roller is wound around the filament bundle for one turn, the heating temperature of the filament separation roller is zero, and the spinning speed is 550-650 m / min; The first pair of low-temperature hot rollers are wound around the filament bundle for 6.5 to 7.5 turns, the heating temperature of the first pair of low-temperature hot rollers is 65-90° C., and the spinning speed is 605 m / min; The second pair of high-temperature drafting hot rollers are wound around the filament bundle for 6.5 to 7.5 turns, the heating temperature of the second pair of high-temperature drafting hot rollers is 100-140°C, the spinning speed is 1950m / min, and the drafting multiple of the first pair of low-temperature hot rollers and the second pair of high-temperature drafting hot rollers is 2.5-3.5 times; The third pair of high-temperature drafting hot rollers are wound around the filament bundle for 6.5 to 7.5 turns, the heating temperature of the third pair of high-temperature drafting hot rollers is 110-150°C, the spinning speed is 3500m / min, and the drafting multiple of the second pair of high-temperature drafting hot rollers and the third pair of high-temperature drafting hot rollers is 1.5-2 times; The fourth pair of hot drafting rollers are wound around the filament bundle for 6.5 to 7.5 turns, the heating temperature of the fourth pair of hot drafting rollers is 110-150°C, the spinning speed is 3900 m / min, and the drafting multiples of the third pair of high-temperature hot drafting rollers and the fourth pair of hot drafting rollers are 1.1-1.3 times; The heating temperature of the fifth hot shaping roller group is 70-120° C., the spinning speed is 4250 m / min, and the drafting multiple of the fourth pair of hot drawing shaping rollers and the fifth hot drawing roller group is 1.02-1.05 times.

5. The polylactic acid industrial fiber spinning, drawing and winding device according to claim 3, characterized in that: The heating temperature of the sixth relaxation guide disc is zero, and the roller shell surface of the sixth relaxation guide disc is ceramic.

6. The polylactic acid industrial fiber spinning, drawing and winding device according to claim 4, characterized in that: The roller shell surfaces of the filament separation roller, the first pair of low-temperature hot rollers, the second pair of high-temperature drawing hot rollers, the third pair of high-temperature drawing hot rollers, the fourth pair of drawing and shaping hot rollers and the fifth shaping hot roller group are all made of ceramics.

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