A fiber spinning, drawing and winding combined machine for the polylactic acid industry

Abstract

The present invention discloses a fiber spinning, drawing and winding combined machine for the polylactic acid industry, which relates to the technical field of spinning production and solves the technical problem of deflection difficulties when the polylactic acid tow enters the drawing and winding device in the related art. In the combined machine, the spinning device includes a screw extruder, an extrusion head and a duct component arranged in sequence according to the production process, and the drawing and winding device includes a double-sided oiling mechanism, a suction cutter and a winder arranged in sequence according to the production process; the tow passes through the double-sided oiling mechanism, the suction cutter and the pre-networker in sequence from the duct component until it is conveyed to the splitting roller. The drawing and winding device is arranged in parallel with the spinning device so that the tow between the spinning device and the splitting roller is arranged in the vertical direction and tangent to the splitting roller. Under this parallel arrangement, the tow does not deflect after being led out from the spinning device and entering the drawing and winding device, thereby avoiding friction caused by high deflection and damaging the tow, especially in the production of FDY spinning of fibers for the polylactic acid industry.

Description

Technical Field

[0001] The present invention relates to the technical field of spinning production, and particularly relates to a fiber spinning, drawing and winding combined machine for the polylactic acid industry. Background Art

[0002] Most of the fiber filament spinning, drawing and winding equipment for the polylactic acid industry is modified from other types of equipment, and the biggest drawback is the instability of product quality and performance.

[0003] Compared with petroleum synthetic fibers, the bio-based polylactic acid tow is relatively fragile. In order to avoid damage caused by strong deflection and winding and to avoid different physical properties, it is not allowed to exceed a certain limit value when the silk thread deflects. Summary of the Invention

[0004] The present application provides a fiber spinning, drawing and winding combined machine for the polylactic acid industry, which solves the technical problem of the deflection difficulty when the polylactic acid tow enters the drawing and winding device in the related art.

[0005] The present application provides a fiber spinning, drawing and winding combined machine for the polylactic acid industry, including a spinning device and a drawing and winding device. The spinning device includes a screw extruder, an extrusion head, a melt conveying pipeline, a spinning box, a spinning component, a slow cooler, a monomer suction component, a combined cooling mechanism and a duct component arranged in sequence according to the production process. The drawing and winding device includes a double-sided oiling mechanism, a shear and suction device, a pre-networker, a filament dividing roller, a first pair of low-temperature hot rollers, a second pair of high-temperature drawing hot rollers, a third pair of high-temperature drawing hot rollers, a fourth pair of drawing and setting hot rollers, a fifth setting hot roller group, a sixth relaxation guide disk, a porcelain wire guide hook, a main networker and a winding machine arranged in sequence according to the production process. The tow passes through the double-sided oiling mechanism, the shear and suction device and the pre-networker in sequence from the duct component until it is transmitted to the filament dividing roller. The drawing and winding device and the spinning device are configured to be arranged in parallel, so that the tow between the spinning device and the filament dividing roller is arranged in the vertical direction and is tangent to the filament dividing roller.

[0006] Optionally, the fifth setting hot roller group includes a heat preservation cover box, at least four heat setting rollers and a heating source. The heat preservation cover box is provided with an incoming tow channel and an outgoing tow channel for the tow to pass through. At least four heat setting rollers are arranged in sequence according to the production process, and the heat setting rollers are all arranged inside the heat preservation cover box. The heating source is used to heat the tow in the heat preservation cover box at an environment temperature of 70-120°C.

[0007] Optionally, the heating source includes an inductive heating source, a steam heating source or a hot air heating source; when the heating source includes an inductive heating source, it is used for heat setting the polylactic acid industrial fiber spinning with a setting temperature in the first preset range, and the heat setting rollers are all arranged as inductive heating setting heat rollers; when the heating source includes a steam heating source, it is used for heat setting the polylactic acid industrial fiber spinning with a setting temperature in the second preset range. A steam inlet is opened at a lower position on the side wall of the heat preservation hood box, and a steam outlet is opened at a higher position on the side wall of the heat preservation hood box. The steam inlet and the steam outlet are opened on opposite sides of the heat preservation hood box, and the steam heating source conveys hot steam into the heat preservation hood box; when the heating source includes a hot air heating source, it is used for heat setting the polylactic acid industrial fiber spinning with a setting temperature in the third preset range. A plurality of heating plates are arranged in the heat preservation hood box, the heating plates are arranged at intervals from the heat setting rollers, and the heating plates are arranged close to the filament bundle in the heat preservation hood box; 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.

[0008] Optionally, the thread dividing roller is wound with the filament bundle for 1 circle, the heating temperature of the thread dividing roller is zero, and the spinning speed is 550 - 650 m / min; the first pair of low-temperature heat rollers are wound with the filament bundle for 6.5 - 7.5 circles, the heating temperature of the first pair of low-temperature heat rollers is 65 - 90 °C, the spinning speed is 605 m / min, and the thread dividing roller and the first pair of low-temperature heat rollers maintain a speed ratio of 1:1.01; the second pair of high-temperature drawing heat rollers are wound with the filament bundle for 6.5 - 7.5 circles, the heating temperature of the second pair of high-temperature drawing heat rollers is 100 - 140 °C, the spinning speed is 1950 m / min, and the draw ratio of the first pair of low-temperature heat rollers to the second pair of high-temperature drawing heat rollers is 2.5 - 3.5 times; the third pair of high-temperature drawing heat rollers are wound with the filament bundle for 6.5 - 7.5 circles, the heating temperature of the third pair of high-temperature drawing heat rollers is 110 - 150 °C, the spinning speed is 3500 m / min, and the draw ratio of the second pair of high-temperature drawing heat rollers to the third pair of high-temperature drawing heat rollers is 1.5 - 2 times; the fourth pair of drawing and setting heat rollers are wound with the filament bundle for 6.5 - 7.5 circles, the heating temperature of the fourth pair of drawing and setting heat rollers is 110 - 150 °C, the spinning speed is 3900 m / min, and the draw ratio of the third pair of high-temperature drawing heat rollers to the fourth pair of drawing and setting heat rollers is 1.1 - 1.3 times; the heating temperature of the fifth setting heat roller group is 70 - 120 °C, the spinning speed is 4250 m / min, and the draw ratio of the fourth pair of drawing and setting heat rollers to the fifth setting heat roller group is 1.02 - 1.05 times.

[0009] Optionally, the screw extruder includes a screw sleeve and a screw disposed through the screw sleeve. The screw includes a feeding section, a compression section, and a metering section arranged in sequence. The screw sleeve includes a gas collection chamber opened on the inner wall at the junction of the compression section and the metering section and an exhaust hole communicated with the gas collection chamber. Among them, an opening and closing valve for opening and closing the exhaust hole is installed on the screw sleeve.

[0010] Optionally, the spinning box includes a metering pump, a pump plate, a pump base, a box body pipeline, a melt gasket, and an anti-corrosion gasket. The metering pump, the pump plate, and the pump base are connected in sequence. The box body pipeline includes a connection between the pump plate and the pump base. The pump plate, the melt gasket, the anti-corrosion gasket, and the pump base are stacked in sequence. Both the melt gasket and the anti-corrosion gasket are provided with through holes for the box body pipeline connecting the pump plate and the pump base to pass through.

[0011] Optionally, the spinning component includes a component body, a gland, a melt distributor, a multi-layer filter screen, a spinneret plate, a ball layer, a filter layer, and a distribution plate. The gland, the melt distributor, the multi-layer filter screen, and the spinneret plate are sequentially arranged in the inner channel of the component body along the melt flow direction. The ball layer, the filter layer, and the distribution plate are sequentially arranged in layers in the inner channel of the melt distributor along the melt flow direction. The ball layer includes a plurality of balls placed on the filter layer.

[0012] Optionally, the combined cooling mechanism includes an outer ring blowing component, a lifting component, and a side blowing component arranged in sequence. The lifting component includes a telescopic hose and a lifting power component. The top end of the telescopic hose is connected to the outer ring blowing component, and the bottom end is connected to the side blowing component. The lifting power component is arranged in the middle of the outer ring blowing component and the side blowing component. The combined cooling mechanism is detachably arranged with the spinning component, and the lifting power component is configured to drive the outer ring blowing component to approach or move away from the spinning component.

[0013] Optionally, the spinning component, the slow cooler, and the monomer suction component are relatively fixedly arranged, and the outer ring blowing component of the combined cooling mechanism is detachably arranged with the monomer suction component. The lifting power component of the combined cooling mechanism drives the outer ring blowing component to approach or move away from the monomer suction component.

[0014] Optionally, the double-sided oiling mechanism includes multiple pairs of oil nozzles. Each pair of oil nozzles includes two oil nozzles respectively located on the radial two sides of the to-be-oiled tow. Each pair of oil nozzles is configured to approach each other in the top view direction to form a spinning state, and to move away from each other in the top view direction to form a threading state.

[0015] The beneficial effects of this application are as follows: This application provides a fiber spinning, drawing and winding combined machine for the polylactic acid industry, including a spinning device and a drawing and winding device. The tow enters the drawing and winding device through the spinning device. In this application, the spinning device and the drawing and winding device are arranged in parallel in terms of equipment layout. Specifically, the tow sequentially passes through the double-sided oiling mechanism, the shear suction wire, and the pre-networker from the spinning device until it is transmitted to the filament splitting roller, so that the tow between the spinning device and the filament splitting roller is arranged in the vertical direction and tangent to the filament splitting roller. Under this parallel arrangement, the tow does not deflect after being led out from the spinning device and entering the drawing and winding device, thereby avoiding friction caused by high deflection and damaging the tow, especially in the production of polylactic acid industry fiber FDY spinning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0017] Figure 1 The front view of the fiber spinning, drawing and winding combined machine for the polylactic acid industry provided in Embodiment 1;

[0018] Figure 2 For Figure 1 The side view of the structure shown;

[0019] Figure 3 For Figure 1 The top view of the screw extruder, extrusion head, melt conveying pipeline and spinning box in ;

[0020] Figure 4 For Figure 1 The side view of the fifth shaping hot roll group in ;

[0021] Figure 5 For Figure 1 The front view of the fifth shaping hot roll group using an inductive heating source in ;

[0022] Figure 6 For Figure 1 The front view of the fifth shaping hot roll group using a steam heating source in ;

[0023] Figure 7 For Figure 1 The front view of the fifth shaping hot roll group using a hot air heating source in ;

[0024] Figure 8 The overall structural schematic diagram of a screw extruder provided in Embodiment 3;

[0025] Figure 9 For Figure 8 The partial structural schematic diagram at A in ;

[0026] Figure 10 For Figure 9 The cross-section comparison schematic diagram of G1-G1, G2-G2, G3-G3 in ;

[0027] Figure 11 For Figure 8 The partial enlarged view at B in ;

[0028] Figure 12 For Figure 11 The schematic diagram of another feasible implementation manner of ;

[0029] Figure 13 For Figure 11 The schematic diagram of another feasible implementation manner of ;

[0030] Figure 14 is Figure 8 a partial enlarged view at position C in

[0031] Figure 15 is Figure 8 a partial enlarged view at position D in

[0032] Figure 16 is Figure 8 a partial enlarged view at the E - E position in

[0033] Figure 17 is a schematic diagram of the overall structure of a spinning box provided in Example 4;

[0034] Figure 18 is Figure 17 a horizontal cross - sectional view of the structure shown;

[0035] Figure 19 is Figure 17 a vertical cross - sectional view of the structure shown;

[0036] Figure 20 is Figure 19 a partial enlarged view at position F in

[0037] Figure 21 is Figure 20 a cross - sectional view at the J - J position in

[0038] Figure 22 is a schematic diagram of the structure of a spinning component provided in Example 5;

[0039] Figure 23 is a schematic diagram of the structure of the outer - ring blowing component in the raised state in a combined cooling mechanism provided in Example 6;

[0040] Figure 24 is Figure 23 a side view of the structure shown;

[0041] Figure 25 is Figure 23 a schematic diagram of the structure of the outer - ring blowing component in the lowered state in the combined cooling mechanism shown;

[0042] Figure 26 is Figure 25 a side view of the structure shown;

[0043] Figure 27 is a front view of a double - sided oiling mechanism in the spinning state provided in Example 8;

[0044] Figure 28 is Figure 27 a front view of the structure shown in the head - feeding state;

[0045] Figure 29For multiple Figure 27 Top view when the structure shown is in the spinning state;

[0046] Figure 30 Is Figure 29 Top view when the structure shown is in the threading state;

[0047] Figure 31 Front view of another double-sided oiling mechanism provided in Example 9;

[0048] Figure 32 For multiple Figure 31 Top view when the structure shown is in the spinning state;

[0049] Figure 33 Is Figure 32 A top view when the structure shown is in the threading state;

[0050] Figure 34 Is Figure 32 Another top view when the structure shown is in the threading state. Detailed implementation mode

[0051] By providing a fiber spinning, drawing and winding combined machine for the polylactic acid industry in the embodiment of the present application, the technical problem that the polylactic acid tow is deflected when entering the drawing and winding device in the related art is solved.

[0052] The technical solution in the embodiment of the present application is to solve the above technical problem, and the general idea is as follows:

[0053] A fiber spinning, drawing and winding combined machine for the polylactic acid industry includes a spinning device and a drawing and winding device. The spinning device includes a screw extruder, an extrusion head, a melt conveying pipeline, a spinning box, a spinning component, a slow cooler, a monomer suction component, a combined cooling mechanism and a duct component arranged in sequence according to the production process. The drawing and winding device includes a double-sided oiling mechanism, a shear and suction device, a pre-networker, a filament splitting roller, a first pair of low-temperature hot rollers, a second pair of high-temperature drawing hot rollers, a third pair of high-temperature drawing hot rollers, a fourth pair of drawing and setting hot rollers, a fifth setting hot roller group, a sixth relaxation guide disk, a porcelain wire guide hook, a main networker and a winding machine; the tow passes through the double-sided oiling mechanism, the shear and suction device and the pre-networker in sequence from the duct component until it is conveyed to the filament splitting roller. The drawing and winding device and the spinning device are configured to be arranged in parallel so that the tow between the spinning device and the filament splitting roller is arranged in the vertical direction and tangent to the filament splitting roller.

[0054] In order to better understand the above technical solution, the above technical solution will be described in detail below in combination with the specification drawings and specific implementation modes.

[0055] Example 1

[0056] Please refer to Figures 1 to 3, this embodiment provides a fiber spinning, drawing and winding combined machine for the polylactic acid industry, which includes a spinning device 100 and a drawing and winding device 200. The spinning device includes a screw extruder 1, an extrusion head 2, a melt conveying pipeline 3, a spinning box 4, a spinning assembly 6, a slow cooler 7, a monomer suction component 8, a combined cooling mechanism 9 and a duct component 10 arranged in sequence according to the production process. The drawing and winding device 200 includes a double-sided oiling mechanism 11, a suction cutter 12, a pre-networker 13, a filament splitting roller 14, a first pair of low-temperature hot rollers 15, a second pair of high-temperature drawing hot rollers 16, a third pair of high-temperature drawing hot rollers 17, a fourth pair of drawing and setting hot rollers 18, a fifth setting hot roller group 19, a sixth relaxation guide disk 20, a porcelain wire guide hook 21, a main networker 22 and a winding machine 23 arranged in sequence according to the production process; the filament bundle passes through the double-sided oiling mechanism 11, the suction cutter 13 and the pre-networker 13 in sequence from the duct component 10 until it is conveyed to the filament splitting roller 14. The drawing and winding device 200 and the spinning device 100 are configured to be arranged in parallel, so that the filament bundle between the spinning device 100 and the filament splitting roller 14 is arranged in the vertical direction, and the filament bundle between the spinning device 100 and the filament splitting roller 14 is tangent to the filament splitting roller.

[0057] Under this parallel arrangement, the filament bundle does not deflect after being led out from the spinning device 100 and entering the drawing and winding device 200, thus avoiding the friction caused by higher deflection and damaging the filament bundle, especially in the production of FDY spinning of fibers for the polylactic acid industry.

[0058] The selection of the filament splitting roller 14 includes a tension filament splitting pair of rollers or a feeding roller. When the filament splitting roller 14 is selected as a tension filament splitting pair of rollers, it is beneficial for spatial arrangement and cost saving. When the filament splitting roller 14 is selected as a feeding roller, it has a certain grip on the filament and is convenient for filament splitting.

[0059] Different from other types of spinning such as polyester, polylactic acid is heated to a certain temperature, and the molecular structure of the fiber changes, and then it is set. Due to the characteristics of polylactic acid fibers, the setting of fibers for the polylactic acid industry is not yet perfect, which lies in the requirements for longer setting length and setting time.

[0060] Please combine Figure 5 , in this embodiment, the fifth setting hot roller group 19 includes a heat preservation cover box 19-5, a heating source and at least four heat setting rollers. The heat preservation cover box 19-5 is provided with an incoming filament channel 19-6 and an outgoing filament channel 19-8 for the filament bundle 19-7 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 19-5. The heating source is used to heat the filament bundle 19-7 in the heat preservation cover box 19-5 in an environment of 70-120°C.

[0061] In the above solution of replacing the traditional pair of sizing rollers with the fifth sizing hot roller set 19, by increasing the number of hot sizing rollers and arranging all the hot sizing rollers in the heat preservation hood box 19-5, the path is increased within a limited space, and the spinning process is extended, which is beneficial to meeting the strict requirements for the sizing length and sizing time during the spinning of polylactic acid filaments, and can make the sizing effect more sufficient. Among them, the speeds of the respective hot sizing rollers of the fifth sizing hot roller set 19 can be adjusted separately, which is beneficial to the control of the sizing step. Among them, the fifth sizing hot roller set 19 needs to ensure that the filament bundle 19-7 enters the heat preservation hood box 19-5 in an upward direction and is output downward. Therefore, it is preferably to control the number of hot sizing rollers in the heat preservation hood box 19-5 to 4, and 6, 8, etc. can also be set.

[0062] Optionally, please refer to Figure 4 and Figure 5 , the fifth sizing hot roller set 19 includes four hot sizing rollers, namely the first hot sizing roller 19-1, the second hot sizing roller 19-2, the third hot sizing roller 19-3, and the fourth hot sizing roller 19-4 arranged in sequence according to the production process. The filament bundle 19-7 passes through the inlet filament channel 19-6 and successively winds around the first hot sizing roller 19-1, the second hot sizing roller 19-2, the third hot sizing roller 19-3, and the fourth hot sizing roller 19-4 until it passes through the outlet filament channel 19-8. As Figure 5 shown, the first hot sizing roller 19-1 is arranged higher than the second hot sizing roller 19-2, the third hot sizing roller 19-3 has the same height as the first hot sizing roller 19-1, and the fourth hot sizing roller 19-4 has the same height as the second hot sizing roller 19-2.

[0063] Optionally, the heating source includes an inductive heating source, a steam heating source, or a hot air heating source. As Figure 5 shown, when the heating source includes an inductive heating source, it is used for hot sizing of polylactic acid industrial fiber filaments with a sizing temperature in the first preset range, and all the hot sizing rollers are arranged as inductive heating sizing hot rollers. Inductive heating sizing is relatively uniform in heat absorption, but consumes a large amount of electricity and has a high cost. It is used for bio-based polylactic acid industrial long filaments with a relatively high sizing temperature, and has relatively high requirements for various indicators.

[0064] As Figure 6 shown, when the heating source includes a steam heating source, it is used for hot sizing of polylactic acid industrial fiber filaments with a sizing temperature in the second preset range. A steam inlet 19-5a is opened at a lower position on the side wall of the heat preservation hood box 19-5, and a steam outlet 19-5b is opened at a higher position on the side wall of the heat preservation hood box 19-5. The steam inlet 19-5a and the steam outlet 19-5b are opened on opposite sides of the heat preservation hood box 19-5. The steam heating source conveys hot steam into the heat preservation hood box 19-5, specifically inputting into the heat preservation hood box 19-5 through the steam inlet 19-5a, and outputting from the steam outlet 19-5b after hot sizing the filament bundle 19-7.

[0065] As Figure 7 shown, when the heating source includes a hot air heating source, it is used for heat setting the polylactic acid industrial fiber spinning with a setting temperature in the third preset range. A plurality of heating plates 19-9 are provided in the heat preservation hood 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 tow 19-7 in the heat preservation hood box 19-5. Heat setting can be performed by the heating plates 19-9, and temperature control can be carried out.

[0066] Due to the properties of polylactic acid fibers, their setting generally requires not exceeding 120°C and not being lower than 70°C. In an implementable embodiment, 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. According to the decrease of the setting temperature, an inductive heating source, a steam heating source, or a hot air heating source is selected and set in sequence. 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. Optionally, for the polylactic acid industrial filament with a setting temperature of 110°C to 120°C, inductive heat setting is adopted. Optionally, for the polylactic acid industrial filament with a setting temperature of 95°C to 105°C, steam heat setting is adopted. Optionally, hot air setting is adopted for the polylactic acid industrial filament with a setting temperature of 70°C to 90°C.

[0067] Optionally, as Figure 7 shown, in the hot air heat setting, the heating plates 19-9 include the heating plates 19-9 provided at the inlet of the heat preservation hood box 19-5, and another type of heating plates 19-9 provided between the subsequent heat setting rollers. Since the temperature change is relatively large at the inlet position, that is, the area after the inlet silk path 19-6, the tow 19-7 passes through the heating plates 19-9 at this inlet, and the cross-section of the corresponding heating plates 19-9 is arranged in a U shape. The subsequent heating plates 19-9 are arranged between two heat setting rollers, which is beneficial to the space layout in the heat preservation hood box 19-5 and beneficial to the smaller specification setting of the heat preservation hood box 19-5.

[0068] Optionally, as Figure 1 shown, the drafting and winding device 200 further includes a sixth slack guide disk 20, a porcelain wire guide hook 21, a main networker 22, and a winder 23, which are sequentially arranged according to the production process after the fifth heat setting roller group 19. The sixth slack guide disk 20 plays a role in slackening and eliminating tension. After the tow winds around the sixth slack guide disk 20, it passes through the porcelain wire guide hook 21 and is sent to the main networker 22 for knotting. After the tow is knotted, it is sequentially transmitted to the winder 23 to complete winding.

[0069] The fiber spinning, drawing and winding combined machine for polylactic acid industry in this embodiment can produce multifilaments for biobased polylactic acid industry with 4 - 16 heads of different varieties.

[0070] Example 2

[0071] Based on the fiber spinning, drawing and winding combined machine for polylactic acid industry in Example 1, in this embodiment, specific parameters of the filament splitting 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 setting hot rollers 18, and the fifth setting hot roller group 19 are set. Specifically, the filament splitting roller 14 is wound with the filament bundle for 1 turn, the heating temperature of the filament splitting roller 14 is zero, in a non - heating state, and the spinning speed is 550 - 650 m / min. The first pair of low - temperature hot rollers 15 is wound with the filament bundle for 6.5 - 7.5 turns, the heating temperature of the first pair of low - temperature hot rollers 15 is 65 - 90 °C, the spinning speed is 605 m / min, and the speed ratio between the filament splitting roller 14 and the first pair of low - temperature hot rollers 15 is 1:1.01. The second pair of high - temperature drawing hot rollers 16 is wound with the filament bundle for 6.5 - 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 1950 m / min, and the drawing ratio between the first pair of low - temperature hot rollers 15 and the second pair of high - temperature drawing hot rollers 16 is 2.5 - 3.5 times. The third pair of high - temperature drawing hot rollers 17 is wound with the filament bundle for 6.5 - 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 3500 m / min, and the drawing ratio between the second pair of high - temperature drawing hot rollers 16 and the third pair of high - temperature drawing hot rollers 17 is 1.5 - 2 times. The fourth pair of drawing and setting hot rollers 18 is wound with the filament bundle for 6.5 - 7.5 turns, the heating temperature of the fourth pair of drawing and setting hot rollers 18 is 110 - 150 °C, the spinning speed is 3900 m / min, and the drawing ratio between the third pair of high - temperature drawing hot rollers 17 and the fourth pair of drawing and setting hot rollers 18 is 1.1 - 1.3 times. The heating temperature of the fifth setting hot roller group 19 is 70 - 120 °C, the spinning speed is 4250 m / min, and the drawing ratio between the fourth pair of drawing and setting hot rollers 18 and the fifth setting hot roller group 19 is 1.02 - 1.05 times.

[0072] Optionally, the heating temperature of the sixth relaxation guide disk 20 is zero, in a non - heating state.

[0073] Optionally, the surfaces of the roller shells of the filament splitting 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 setting hot rollers 18, the fifth setting hot roller group 19, and the sixth relaxation guide disk 20 can all be set with ceramics.

[0074] Example 3

[0075] Please refer to Figure 8 and Figure 11, based on the fiber spinning, drawing and winding combined machine for the polylactic acid industry in Embodiment 1, this embodiment discloses a screw extruder, which includes a screw sleeve 1-a and a screw 1-b disposed through the screw sleeve 1-a. The screw 1-b includes a feeding section 1-5d, a compression section (such as Figure 8 in which the compression section is presented as a first compression section 1-5c and a second compression section 1-5b, and can also be in other forms), and a metering section 1-5a. The screw sleeve 1-a includes a gas collection chamber 1-3g and an exhaust hole 1-3d. The gas collection chamber 1-3g is on the inner wall at the junction of the compression section and the metering section 1-5a, and the exhaust hole 1-3d communicates with the gas collection chamber 1-3g. Among them, an opening and closing valve 1-3 for opening and closing the exhaust hole 1-3d is installed on the screw sleeve 1-a.

[0076] An external heater is configured outside the screw sleeve 1-a to provide heat. The screw 1-b includes a feeding section 1-5d, a compression section, and a metering section 1-5a in sequence. When the polylactic acid raw material enters the feeding section 1-5d, it gradually changes from a solid state to a molten melt as the temperature rises step by step, and at the same time, it becomes a molten state under the shearing heat between the raw materials. In the compression section, the solid material is compressed and sheared to be fully melted into a liquid phase. When the bio-based polylactic acid raw material is heated, a small part of the raw material structure is unstable and undergoes chemical changes, resulting in hydrolysis. The generated gas has a serious impact on the subsequent spinning. The gas is collected by the gas collection chamber 1-3g located at the end of the compression section and is controlled by the opening and closing valve 1-3 to discharge the gas generated by hydrolysis from the exhaust hole 1-3d in a concentrated manner. When the melt enters the metering section 1-5a, the gas is removed in time, thereby overcoming the serious adverse effects of hydrolysis gas on spinning, improving the adverse situation of broken ends, and ensuring the subsequent spinning quality and spinning efficiency.

[0077] Optionally, as Figure 8 and Figure 11 shown, the screw sleeve 1-a includes a butt-jointed first screw sleeve 1-1 and a second screw sleeve 1-4. The screw 1-b is disposed through the first screw sleeve 1-1 and the second screw sleeve 1-4. The first screw sleeve 1-1 is provided with an exhaust hole 1-3d and is installed with an opening and closing valve 1-3. The inner wall of one end of the first screw sleeve 1-1 close to the second screw sleeve 1-4 is recessed. A sealing gasket 1-3f is provided between the first screw sleeve 1-1 and the second screw sleeve 1-4, and / or the inner wall of one end of the second screw sleeve 1-4 close to the first screw sleeve 1-1 is recessed. The first screw sleeve 1-1, the sealing gasket 1-3f, the second screw sleeve 1-4 and the screw 1-b jointly enclose to form a gas collection chamber 1-3g.

[0078] The screw sleeve 1-a is arranged in the form of a combination of a first screw sleeve 1-1 and a second screw sleeve 1-4 so as to assemble and form a gas collection chamber 1-3g. A sealing gasket 1-3f is arranged between the first screw sleeve 1-1 and the second screw sleeve 1-4, which means that the sealing gasket 1-3f is arranged at the butt joint surface of the first screw sleeve 1-1 and the second screw sleeve 1-4, and the first screw sleeve 1-1 and the second screw sleeve 1-4 can be connected by bolts, and the sealing gasket 1-3f is used to ensure the sealing of the gas collection chamber 1-3g.

[0079] Among them, the above-mentioned and / or the inner wall of one end of the second screw sleeve 1-4 close to the first screw sleeve 1-1 is recessed, which means that, on the basis of the inner wall of one end of the first screw sleeve 1-1 close to the second screw sleeve 1-4 being recessed, the inner wall of one end of the second screw sleeve 1-4 close to the first screw sleeve 1-1 can be recessed to cooperate to form a part of the gas collection chamber 1-3g; it can also be recessed separately from the inner wall of one end of the first screw sleeve 1-1 close to the second screw sleeve 1-4, or other possible implementation methods in which it is recessed separately from the inner wall of one end of the second screw sleeve 1-4 close to the first screw sleeve 1-1.

[0080] Optionally, the feeding section 1-5d is configured as a single-thread screw 1-b to complete the feeding; the compression section is configured as a double-thread screw 1-b to reduce the shear heat of the compression section, thereby reducing the overheating phenomenon of the compression section.

[0081] Optionally, see Figure 8 , Figure 14 and Figure 15 The compression section includes a first compression section 1-5c and a second compression section 1-5b, and the first compression section 1-5c and the second compression section 1-5b are arranged in a double-thread screw 1-b. The screw 1-b includes a feed section 1-5d, a first compression section 1-5c, a second compression section 1-5b and a metering section 1-5a arranged in sequence; along the material conveying direction in the screw extruder, the groove depths of the first compression section 1-5c and the second compression section 1-5b gradually decrease, and the degree of change of the groove depth of the second compression section 1-5b is less than that of the first compression section 1-5c.

[0082] The groove depth of the first compression section 1-5c gradually decreases, and the groove depth changes to a large extent, so that the solid phase material is fully melted into the liquid phase by compression and shearing; and then after the second compression section 1-5b, the groove depth of the second compression section 1-5b gradually decreases, and the groove depth changes to a small extent, on the one hand, further allowing the solid phase material to be fully melted into liquid, and on the other hand, providing a relative space for the gas generated after hydrolysis. Among them, the above-mentioned groove depth change degree refers to the amount of groove depth change corresponding to the unit length along the material conveying direction in the screw extruder. The above-mentioned groove depth change degree is large and small refers to the relative relationship between the two.

[0083] Alternatively, if Figure 8As shown, the screw sleeve 1-a includes an electric contact pressure gauge 1-2, and the measuring end of the electric contact pressure gauge 1-2 is communicated with the gas collection chamber 1-3g. The gas collection chamber 1-3g collects the gas generated by the hydrolysis of the material, and when the gas reaches a certain volume, the gas pressure is reflected on the electric contact pressure gauge 1-2, and the action of the opening and closing valve 1-3 is assisted through the electric contact pressure gauge 1-2.

[0084] Optionally, as Figure 8 and Figure 11 shown, the screw sleeve 1-a includes a base 1-c provided on the outer edge, the exhaust hole 1-3d is arranged in an L shape inside the base 1-c, and both ends of the exhaust hole 1-3d are communicated with the gas collection chamber 1-3g and the outside atmosphere respectively, and the opening and closing valve 1-3 is installed on the base 1-c. The opening and closing valve 1-3 includes a valve body 1-3b, a packing seal 1-3c, a valve stem 1-3a and a bushing 1-3e. Part of the valve body 1-3b is arranged inside the base 1-c and the other part protrudes from the base 1-c (as Figure 11 shown, part of the valve body 1-3b is arranged inside the base 1-c and the other part is exposed outside the base 1-c), the valve stem 1-3a movably penetrates through the valve body 1-3b, and in the part where the valve body 1-3b is arranged inside the base 1-c, so that the valve stem 1-3a also movably penetrates through the base 1-c. The packing seal 1-3c is arranged inside the base 1-c and between the base 1-c and the valve stem 1-3a to seal the gap area between the base 1-c and the valve stem 1-3a, so that when the gas is discharged, it is all discharged from the exhaust hole 1-3d. The end of the valve stem 1-3a is arranged in an arc shape to close or conduct the L-shaped bend of the exhaust hole 1-3d. The bushing 1-3e is arranged at the L-shaped bend of the exhaust hole 1-3d of the base 1-c, and the bushing 1-3e is configured to abut against the arc surface at the end of the valve stem 1-3a to ensure good sealing when the valve stem 1-3a closes the exhaust hole 1-3d.

[0085] The above realizes the blocking or conduction of the exhaust hole 1-3d by operating the position of the valve stem 1-3a. Further, under the indication of the reading of the electric contact pressure gauge 1-2, the gas in the gas collection chamber 1-3g is discharged by opening the exhaust hole 1-3d.

[0086] In an implementable embodiment, as Figure 12 shown, the opening and closing valve 1-3 can be set as a manual needle valve 1-3i. In an implementable embodiment, as Figure 13 shown, the opening and closing valve 1-3 can be set as an electric needle valve 1-3j. At this time, the electric needle valve 1-3j can be controlled to open at a fixed value in combination with the electric contact pressure gauge 1-2. In an implementable embodiment, as Figure 11 shown, one end of the exhaust hole 1-3d is directly communicated with the outside atmosphere. In an implementable embodiment, as Figure 12 and Figure 13As shown, an electric vacuum pump 1-3h can be added to the end of the exhaust hole 1-3d to quickly discharge gas by pumping. The electric vacuum pump 1-3h can also be combined with an electric contact pressure gauge 1-2 to control the electric vacuum pump 1-3h to automatically start exhausting at a preset gas pressure.

[0087] Optionally, as Figure 9 and Figure 10 shown, along the material conveying direction in the screw extruder, the metering section 1-5a successively includes a first double-thread structure 1-5a3, a diamond-shaped separating structure 1-5a2, and a second double-thread structure 1-5a1. The diamond-shaped separating structure 1-5a2 is provided in an integrally milled diamond shape or a diamond-shaped pin-processed setting. Among them Figure 10 the upper row of figures in shows the structure of the integrally milled diamond shape, Figure 10 and the lower row of figures in shows the diamond-shaped separating structure 1-5a2 processed by diamond-shaped pins. Through the setting of the diamond-shaped separating structure 1-5a2, the mixing and homogenization of the melt are further promoted.

[0088] Optionally, as Figure 16 shown, for the screw 1-b in the first double-thread structure 1-5a3 part, a plurality of grooved V-shaped grooves 1-5a3-1 to 4 are laid along the spiral ring distribution, and the groove length is set for the entire first double-thread structure 1-5a3 to achieve the beneficial effect of reducing the non-uniformity rate of the melt temperature and intrinsic viscosity.

[0089] Optionally, as Figure 9 and Figure 10 shown, along the material conveying direction in the screw extruder, the diameter of the diamond-shaped separating structure 1-5a2 gradually decreases and the diamond arrangement density gradually decreases. Among them, through Figure 10 the horizontal dotted line in, it is shown that the diameter of the diamond-shaped separating structure 1-5a2 gradually decreases, ensuring that the material does not flow back and gradually reducing the shear heat; through Figure 10 the screenshots of G3-G3, G2-G2, and G1-G1 in are successively compared with the number of diamonds in one circle, showing that the diamond arrangement density gradually decreases. The larger density at the beginning is beneficial for stirring, and the smaller density later is beneficial for reducing the shear heat. Through this design, there is no dead circulation, no raw material retention, no material carbonization phenomenon, which is beneficial to the continuous operation of the spinning process.

[0090] In an implementable embodiment, the length of the single-threaded feeding section 1-5d is set to 9D to 11D, the length of the double-threaded compression section is controlled to be 10D to 11D, and the length of the metering section 1-5a is set to 9D to 15D. In an implementable embodiment, the length of the first double-threaded structure 1-5a3 is set to 4D to 10D, the length of the diamond-shaped separation structure 1-5a2 is 3D, and the length of the second double-threaded structure 1-5a1 is 2D. In an implementable embodiment, the length-diameter ratio of the screw 1-b is controlled to be (28-34):1. In an implementable embodiment, the temperature zone of the screw extruder is controlled to be 160°C to 240°C, and the pressure after filtration of the screw extruder is controlled to be 80-120 kg / cm2. In an implementable embodiment, the thread edge of the feeding section 1-5d is an equal-diameter single pitch, and the thread edge of the second double-threaded structure 1-5a1 is equidistant and equal in height, so as to be fully melted to make the output melt uniform, stabilize the pressure at the melt extrusion outlet, and facilitate the subsequent spinning to achieve quantitative, constant pressure, and constant temperature extrusion from the head in the mixing and extrusion section.

[0091] Example 4

[0092] Please refer to Figures 17 to 21 , based on the polylactic acid industrial fiber spinning, drawing and winding combined machine of Example 1, this example discloses a spinning box 4, which includes a metering pump 4-13, a pump plate 4-14, a pump seat 4-16, a box body pipeline 4-18, a melt gasket 4-15a and an anti-corrosion gasket 4-15b. The metering pump 4-13, the pump plate 4-14 and the pump seat 4-16 are connected in sequence. The box body pipeline 4-18 includes a connection between the pump plate 4-14 and the pump seat 4-16. The pump plate 4-14, the melt gasket 4-15a, the anti-corrosion gasket 4-15b and the pump seat 4-16 are stacked in sequence. Both the melt gasket 4-15a and the anti-corrosion gasket 4-15b are provided with through holes for the box body pipeline 4-18 connecting the pump plate 4-14 and the pump seat 4-16 to pass through.

[0093] Combined with Figure 1 , the molten raw material enters the spinning box 4 through the melt conveying pipeline 3, and specifically advances along the box body pipeline 4-18 in the spinning box 4, including passing through the pump seat 4-16, the pump plate 4-14, the metering pump 4-13 in sequence and then passing through the pump plate 4-14 and the pump seat 4-16 again, and is conveyed to the spinning component 6 of the lower box body 4-1 to form a filament bundle and enter the subsequent process. Among them, the raw material melt is conveyed between the pump plate 4-14 and the pump seat 4-16, specifically along a part of the box body pipeline 4-18 connecting the pump plate 4-14 and the pump seat 4-16. Correspondingly, through holes are provided in the pump plate 4-14 and the pump seat 4-16 for the raw material melt to flow through.

[0094] It is understandable that a gasket 4-15 is provided between the pump plate 4-14 and the pump base 4-16 to enhance the tightness of the melt flow between the pump plate 4-14 and the pump base 4-16. The gasket 4-15 is generally a melt gasket 4-15a, specifically as Figure 19 and Figure 20 shown. The pump plate 4-14 and the pump base 4-16 are fixedly connected, for example, by screws, so that the melt gasket 4-15a is squeezed to play a sealing role. Based on the selection of the melt gasket 4-15a, this solution also adds a setting of the gasket 4-15. Specifically, a layer of anti-corrosion gasket 4-15b is further provided between the melt gasket 4-15a and the pump base 4-16, forming a stacked arrangement of the pump plate 4-14, the melt gasket 4-15a, the anti-corrosion gasket 4-15b, and the pump base 4-16 in sequence. Correspondingly, the box body pipeline 4-18 connecting the pump plate 4-14 and the pump base 4-16 passes through the melt gasket 4-15a and the anti-corrosion gasket 4-15b.

[0095] Through the above anti-corrosion gasket 4-15b, the corrosion of the surface of the pump base 4-16 caused by the weak acidity of the raw material liquid state is improved, the flatness of the surface of the pump base 4-16 is protected, and the good tightness of the melt gasket 4-15a is ensured. Thus, adverse situations such as sealing defects, material leakage, and insufficient supply of raw material melt leading to broken heads caused by the corrosion of the pump base 4-16 are improved, which is beneficial to the production of spinning of materials with weakly acidic raw material melt, such as fiber spinning for the polylactic acid industry.

[0096] As Figure 21 shown, there is a large middle pipeline for the raw material melt to flow through the pump base 4-16 and the pump plate 4-14. After the action of the metering pump 4-13, it will be divided into multiple pipelines, such as Figure 21 the four small pipelines around shown. The raw material melt penetrates into the pump plate 4-14 and the pump base 4-16 until it enters the spinning components 6 corresponding to the small pipelines one by one. A plurality of spinning components 6 are distributed along the length direction of the bottom side of the component connecting plate 4-17, and each spinning component 6 has an inlet.

[0097] As Figure 18 shown, the spinning box 4 disclosed in this embodiment includes two pump bases 4-16, and the pump bases 4-16 are respectively provided with corresponding pump plates 4-14, metering pumps 4-13, spinning components 6 and corresponding pipelines. Because the function of the metering pump 4-13 is to continuously and accurately supply the melt to the spinning components 6 under high pressure, there are requirements for high-precision metering accuracy. Regarding the metering pump drive components 5 of the metering pump 4-13, as Figure 1 shown, it is driven by a permanent magnet synchronous motor directly connected to a cycloidal pinwheel reducer and frequency conversion speed regulation. Each pump is independently driven, the transmission shaft can be telescopic, and the transmission shaft is provided with a universal coupling and a safety pin protection device.

[0098] Optionally, asFigure 19 As shown, the spinning box 4 includes a heat distribution block 4-12. The heat distribution block 4-12 is arranged between the metering pump 4-13 and the outer shell of the spinning box 4. The heat distribution block 4-12 surrounds the metering pump 4-13, improving the heat preservation effect on the metering pump 4-13.

[0099] Optionally, the corrosion-resistant gasket 4-15b is made of corrosion-resistant flexible material. The corrosion-resistant flexible material includes copper or aluminum, and the corrosion-resistant gasket 4-15b is correspondingly arranged in the form of a copper gasket or an aluminum gasket. Optionally, the pump plate 4-14 and the pump seat 4-16 are connected by high-temperature-resistant standard parts. The high-temperature-resistant standard parts include screws made of 35CrMoA material. Using high-temperature-resistant standard parts makes disassembly, assembly and replacement convenient.

[0100] Optionally, as Figure 19 shown, the spinning box 4 further includes a component connection plate 4-17. The component connection plate 4-17 is arranged inside the lower box body 4-1. The component connection plate 4-17 is used to connect with the spinning component 6. The box body pipeline 4-18 includes a melt distribution output channel 4-18a that communicates the pump seat 4-16 and the component connection plate 4-17. The melt distribution output channel 4-18a can be optionally arranged in the form of pipe fittings inside the spinning box 4. The melt distribution output channel 4-18a includes a first-section melt distribution output channel 4-18a1 and a second-section melt distribution output channel 4-18a2. One end of the first-section melt distribution output channel 4-18a1 communicates with the pump seat 4-16, and one end of the second-section melt distribution output channel 4-18a2 communicates with the component connection plate 4-17. Among them, the other end of the first-section melt distribution output channel 4-18a1 and the other end of the second-section melt distribution output channel 4-18a2 are hermetically connected through a detachable connector.

[0101] Compared with the related art, in the spinning box 4, the pump seat 4-16 and the component connection plate 4-17 are welded and communicated through a plurality of steel pipes serving as melt distribution pipelines, making the pump seat 4-16, the component seat and the steel pipes form an inseparable whole. Such a spinning box 4 has a single function and no interchangeability. Also, since the pump seat 4-16, the component connection plate 4-17 and the steel pipes are integrated, there are many bends in the steel pipes. Therefore, it is easy to cause pipeline blockage and not easy to clean. Even with cleaning tools, it is difficult to clean thoroughly.

[0102] However, through the detachable connection arrangement of the two sections of the melt distribution output channel 4-18a in this embodiment, in an optional case, the first-section melt distribution output channel 4-18a1 and the second-section melt distribution output channel 4-18a2 can be disassembled, meeting the requirement of interchangeability and expanding the application range; the detachable arrangement of the two sections is also beneficial for separate cleaning when blocked, facilitating thorough cleaning of the melt distribution output channel 4-18a. It can be understood that for the detachable connection of the two sections of the melt distribution output channel 4-18a, the sealing performance of the connection between the two sections also needs to be ensured.

[0103] Optionally, as Figure 1 , Figure 17 and Figure 19 shown, the spinning box 4 includes an upper box body 4-2 and a lower box body 4-1. The upper box body 4-2 is installed on the lower box body 4-1. The metering pump 4-13, the pump plate 4-14, and the pump seat 4-16 are sequentially installed vertically in the upper box body 4-2. The spinning box 4 is matched with the melt conveying pipeline 3. The box body pipeline 4-18 also includes a connection between the melt conveying pipeline 3 and the pump seat 4-16. Setting the spinning box 4 as a combination of the upper box body 4-2 and the lower box body 4-1 is beneficial for reasonably arranging components, reducing the volume of the box body, and facilitating the assembly process.

[0104] Optionally, as Figure 17 shown, the upper box body 4-2 is heated by a heater. There is a metal filler 4-9 in the upper box body 4-2. The metal filler 4-9 is used to replace the conventional diphenyl vapor to transfer heat to achieve the effect of uniform temperature. The heater includes an upper box body basic heater 4-4, an upper box body auxiliary heater 4-5, and an upper box body regulating heater 4-6. Thus, one or more different heating modes can be specifically adopted, and beneficial effects such as rapid heating, heat preservation, and temperature adjustment can be achieved.

[0105] As Figure 17 shown, the lower box body 4-1 is provided with a heat-conducting oil inlet 4-7 and a heat-conducting oil outlet 4-8. The heat-conducting oil inlet 4-7 and the heat-conducting oil outlet 4-8 are connected to the configured containerized heat-conducting oil boiler and are correspondingly equipped with pumping. Through the settings of the upper box body 4-2 and the lower box body 4-1, combined with their respective heating methods, the heating and temperature control of the upper box body 4-2 and the lower box body 4-1 are separately controlled and mutually related.

[0106] Optionally, as Figure 19 shown, the upper box body 4-2 includes an upper box body temperature measuring element 4-10, and the lower box body 4-1 includes a lower box body temperature measuring element 4-11, which respectively detect the metal filler 4-9 in the upper box body 4-2 and the heat-conducting oil in the lower box body 4-1. Furthermore, an intelligent temperature control system can be adopted, which can reduce energy consumption, is beneficial to environmental protection, timely feedbacks data, adjusts the heating power, realizes intelligent temperature control, and the temperature control accuracy can reach ±1°C.

[0107] Optionally, the spinning box 4 includes a spinning box melt pressure measuring element 4-3, and the spinning box melt pressure measuring element 4-3 is installed on the upper box body 4-2. When normal spinning, the starting pressure of the spinning component 6 should be greater than 9 Mpa. The spinning box melt pressure measuring element 4-3 provides data support for normal spinning.

[0108] Optionally, when the spinning box 4 is in use, the temperature in the upper box body 4-2 is controlled at 210°C to 225°C. The temperature in the upper box body 4-2 is relatively lower, mainly to protect the melt in a low-temperature dormant state during transportation, reducing the degradation and hydrolysis of the material. When in use, the temperature of the lower box body 4-1 is controlled at 225°C to 245°C, enabling the melt to increase its fluidity in the spinning component 6 after passing through the component connecting plate 4-17, mixing more fully, achieving a more uniform pressure in the component, and reducing various unevenness rates of the tow.

[0109] Example 5

[0110] Please refer to Figure 22 , based on the polylactic acid industrial fiber spinning, drawing and winding combined machine of Example 1, this example discloses a spinning component 6, including a component body 6-5, a gland 6-2, a melt distributor 6-3, a multi-layer filter screen 6-10, a spinneret 6-4, a ball layer 6-8, a filter layer 6-9 and a distribution plate 6-11. The gland 6-2, the melt distributor 6-3, the multi-layer filter screen 6-10 and the spinneret 6-4 are sequentially arranged in the inner channel of the component body 6-5 along the melt flow direction. The ball layer 6-8, the filter layer 6-9 and the distribution plate 6-11 are sequentially arranged in the inner channel of the melt distributor 6-3 layer by layer along the melt flow direction. The ball layer 6-8 includes a plurality of balls placed on the filter layer 6-9.

[0111] Specifically, the component body 6-5 serves as the main housing of the spinning component 6. The component body 6-5 is provided with an inner channel, and the gland 6-2, the melt distributor 6-3, the multi-layer filter screen 6-10 and the spinneret 6-4 are sequentially arranged in the inner channel of the component body 6-5. The gland 6-2 mounts the remaining components in the component body 6-5. The melt distributor 6-3 is also provided with an inner channel, and the ball layer 6-8, the filter layer 6-9 and the distribution plate 6-11 are sequentially arranged in the inner channel of the melt distributor 6-3. As Figure 22 shown, the melt distributor 6-3 and the distribution plate 6-11 can be integrally provided.

[0112] When in the working state, the melt passes through the gland 6-2, sequentially passes through the ball layer 6-8, the filter layer 6-9 and the distribution plate 6-11, the multi-layer filter screen 6-10 and the spinneret 6-4, and is output in the form of a tow from the spinneret 6-4. This spinning component 6 uses the balls of the ball layer 6-8 to replace the well-known sea sand, adopts ball filtration, improves the adverse phenomenon of raw material caking with sea sand, extends the service time, and is beneficial to more fully mixing the material in the melt distributor 6-3, improving the uniformity of the melt.

[0113] Optionally, the filter layers 6-9 are provided as sintered metal plates, made of sintered materials. The ball layers 6-8 are used in combination with the sintered metal plates to replace the well-known sea sand and the multi-layer filter screens 6-10. The filter area and volume of the sintered metal plates are about 50% more than those of the multi-layer filter screens 6-10. The spinning component 6 of this embodiment uses ball filtration to prevent the raw materials from quickly caking with the sea sand, enabling the materials to be more fully mixed in the cavity of the melt distributor 6-3, extending the service life, improving the heat transfer uniformity of the filter component, and enhancing the uniformity of the melt. The balls of this embodiment can be made of stainless steel material to form stainless steel balls. The balls can also be made of other metal materials.

[0114] Optionally, as Figure 22 shown, the spinning component 6 further includes a lock nut 6-1. The outer peripheral edge of the lock nut 6-1 is threadedly connected to the inner side of the component body 6-5, and the inner peripheral edge of the lock nut 6-1 abuts against the outer peripheral edge of the bottom side and the gland 6-2. When the lock nut 6-1 is tightened, the lock nut 6-1 is tightly connected to the component body 6-5 and presses the gland 6-2 tightly in the inner channel of the component body 6-5. Thus, when the spinneret plate 6-4 at the other end is blocked in the inner channel of the component body 6-5, a state where the gland 6-2, the melt distributor 6-3, the multi-layer filter screen 6-10, and the spinneret plate 6-4 are sequentially pressed tightly can be formed, and they are stably installed in the component body 6-5.

[0115] Optionally, as Figure 22 shown, a limiting portion is provided on the inner side of the component body 6-5 away from the lock nut 6-1. The limiting portion is in concave-convex fit with the spinneret plate 6-4 to limit the spinneret plate 6-4 within the component body 6-5. Through the concave-convex fit between the side of the component body 6-5 away from the lock nut 6-1 and the spinneret plate 6-4, specifically, a limiting portion is inwardly protruded on the inner edge of the component body 6-5, and the limiting portion can be arranged in a ring form. The peripheral edge of the spinneret plate 6-4 is correspondingly arranged in a stepped shape, and the spinneret plate 6-4 is limited in the inner channel of the component body 6-5 through the limiting portion. Especially in the state of installing the lock nut 6-1, the limiting portion is in close contact with the spinneret plate 6-4.

[0116] Optionally, as Figure 22 shown, the gland 6-2 is provided with an internal thread, which is configured to be connected to the component connecting plate 4-17 in the spinning box, thereby realizing the fixed connection of the spinning component 6 to the spinning box.

[0117] Optionally, as Figure 22As shown, the spinning assembly 6 includes a first seal 6-6 disposed between the gland 6-2 and the assembly connection plate 4-17. It can be understood that based on the gland 6-2 being provided with a path channel for the melt to pass through, the first seal 6-6 can be annular and arranged around the path channel, and is arranged between the gland 6-2 and the assembly connection plate 4-17 to seal the gap between the gland 6-2 and the assembly connection plate 4-17. Optionally, as Figure 22 shown, the spinning assembly 6 includes a second seal 6-7 disposed at the junction of the gland 6-2 and the melt distributor 6-3. The second seal 6-7 can be embedded to seal the joint surface between the gland 6-2 and the melt distributor 6-3.

[0118] In an implementable embodiment, the gland 6-2, the melt distributor 6-3, the multi-layer filter screen 6-10, and the spinneret plate 6-4 are sequentially arranged vertically, and the ball layer 6-8, the filter layer 6-9, and the distribution plate 6-11 are sequentially arranged vertically. The entire spinning assembly 6 is arranged vertically in the spinning device.

[0119] Example 6

[0120] Please refer to Figures 23 to 26 , based on the polylactic acid industrial fiber spinning, drawing and winding combined machine of Example 1, this embodiment provides a combined cooling mechanism 9, including an outer ring blowing component 9-1, a lifting component 9-2, and a side blowing component 9-3 arranged in sequence. The lifting component 9-2 includes a telescopic hose 9-2a and a lifting power component 9-2b. The top of the telescopic hose 9-2a is communicated with the outer ring blowing component 9-1, and the bottom is communicated with the side blowing component 9-3. The lifting power component 9-2b is arranged in the middle of the outer ring blowing component 9-1 and the side blowing component 9-3. The combined cooling mechanism 9 and the spinning assembly 6 are detachably arranged, and the lifting power component 9-2b is configured to drive the outer ring blowing component 9-1 to approach or move away from the spinning assembly 6.

[0121] Specifically, the polylactic acid material filament bundle coming down from the spinning assembly 6 passes through the combined cooling mechanism 9 in sequence, passes through the outer ring blowing component 9-1, the telescopic hose 9-2a of the lifting component 9-2, and the side blowing component 9-3 and then enters the next step. During the normal spinning process, the lifting power component 9-2b jacks up the outer ring blowing component 9-1 to form a tight spinning channel with the middle of the spinning assembly 6. When melt residues accumulate on the spinneret plate surface during the production of polylactic acid fiber spinning for a period of time, the lifting power component 9-2b acts to move the outer ring blowing component 9-1 downward. Specifically, for comparison, refer to Figure 23 and Figure 25 、and Figure 24 and Figure 26, the outer ring blowing component 9-1 is relatively separated from the spinning assembly 6, so that the originally tight spinning channel is opened to leave an operating space for the plate cleaning, which is convenient for the regular cleaning of the spinneret plate, beneficial to the quality and normal progress of spinning, and conducive to improving the overall spinning efficiency.

[0122] Optionally, as Figure 24 shown, the lifting component 9-2 further includes a vertical movement guide rail 9-2c, and the vertical movement guide rail 9-2c is arranged between the outer ring blowing component 9-1 and the side blowing component 9-3. By setting the guide rail, it is beneficial to the movement stability of the outer ring blowing component 9-1 and the telescopic hose 9-2a. Optionally, as Figure 24 and Figure 26 shown, the vertical movement guide rail 9-2c includes a guide rod vertically installed on the side blowing component 9-3 and a guide block fixed to the outer ring blowing component 9-1, and the guide rod passes through the guide block. By the limit of the guide block to the guide rod, it is beneficial to the movement stability of the outer ring blowing component 9-1 and the telescopic hose 9-2a.

[0123] Optionally, as Figure 24 and Figure 26 shown, the lifting power component 9-2b includes a cylinder, the cylinder block of the cylinder is fixed on the side blowing component 9-3, and the piston rod of the cylinder abuts against the bottom side of the outer ring blowing component 9-1. In other implementable ways, the lifting power component 9-2b can also adopt forms such as an oil cylinder and a motor.

[0124] Optionally, as Figure 23 and Figure 24 shown, the outer ring blowing component 9-1 includes an outer ring blowing upper air box 9-1a, an outer ring blowing lower air box 9-1b, an outer ring blowing air cylinder 9-1c, an outer ring blowing air guiding member 9-1d and an outer ring blowing air inlet duct 9-1e. The outer ring blowing upper air box 9-1a is stacked on the outer ring blowing lower air box 9-1b, the outer ring blowing air cylinder 9-1c is internally arranged in the outer ring blowing upper air box 9-1a, the outer ring blowing air guiding member 9-1d is internally arranged in the outer ring blowing lower air box 9-1b, the outer ring blowing air cylinder 9-1c is arranged on the outer ring blowing air guiding member 9-1d, and an inner channel for the filament bundle to pass through is arranged in the outer ring blowing air guiding member 9-1d. The filament bundle ejected from the spinning assembly 6 is configured to sequentially pass through the inner cavity of the outer ring blowing air cylinder 9-1c, the inner channel of the outer ring blowing air guiding member 9-1d, the telescopic hose 9-2a and the side blowing component 9-3. One end of the outer ring blowing air inlet duct 9-1e is set as an air inlet, and the other end is communicated with the air guiding surface of the outer ring blowing air guiding member 9-1d to introduce the incoming air between the outer ring blowing upper air box 9-1a and the outer ring blowing air cylinder 9-1c, and air holes are arranged on the cylinder surface of the outer ring blowing air cylinder 9-1c.

[0125] Specifically, the air supply system can provide stable and clean hot air to the outer ring blowing component 9-1. Specifically, it enters through the air inlet of the outer ring blowing inlet air duct 9-1e, is guided along the outer ring blowing inlet air duct 9-1e to the air guiding surface of the outer ring blowing air guiding member 9-1d. The air guiding surface of the outer ring blowing air guiding member 9-1d can further guide the incoming air into the upper air box 9-1a of the outer ring blowing and outside the outer ring blowing cylinder 9-1c. Further, the incoming air passes through the air holes on the cylinder surface of the outer ring blowing cylinder 9-1c and enters the cylinder. The tow inside the cylinder is slowly cooled under the surrounding of hot air. It should be noted that the height of the outer ring blowing cylinder 9-1c can be selected according to actual needs.

[0126] Optionally, the cylinder surface of the outer ring blowing cylinder 9-1c is made of sintered metal mesh, and non-woven fabric is covered on the cylinder surface. Made of sintered metal mesh as the material, it can form voids for hot air to pass through. In another implementable manner, the cylinder surface of the outer ring blowing cylinder 9-1c is arranged as a perforated plate, and non-woven fabric is covered on the cylinder surface. The arrangement of the perforated plate is to directly open several air holes on the outer ring blowing cylinder 9-1c. The above-mentioned perforated plate or sintered metal mesh made plays a damping role, which is beneficial to ensuring uniform wind speed and stable wind pressure, so that the tow is slowly cooled under the surrounding of hot air.

[0127] Optionally, along the tow running direction, the air temperature provided by the outer ring blowing component 9-1 and the air temperature provided by the side blowing component 9-3 form a gradient relationship from high to low; along the tow running direction, the wind speed provided by the outer ring blowing component 9-1 and the wind speed provided by the side blowing component 9-3 form a gradient relationship from slow to fast in batches. The above "gradient" refers to the relationship change that the air temperature gradually decreases in sections along the running direction, and the wind speed gradually increases in sections along the running direction. By setting the air temperature and wind speed, the tow can be cooled well.

[0128] Embodiment 7

[0129] Based on the polylactic acid industrial fiber spinning, drawing and winding combined machine of Embodiment 1 and the combined cooling mechanism 9 provided in Embodiment 6, please refer to Figures 23 to 26 , along the running direction of the tow, there are successively arranged a spinning component 6, a slow cooler 7, a monomer suction component 8 and the combined cooling mechanism 9 of Embodiment 1. The spinning component 6, the slow cooler 7 and the monomer suction component 8 are relatively fixedly arranged. The outer ring blowing component 9-1 of the combined cooling mechanism 9 is detachably arranged with the monomer suction component 8. The lifting power component 9-2b of the combined cooling mechanism 9 drives the outer ring blowing component 9-1 to approach or move away from the monomer suction component 8.

[0130] When spinning biomass polylactic acid, the ejected melt contains monomers, oligomers, etc. that will volatilize. If the biobased polylactic acid tow is immediately cooled, the fluidity and drawability of the tow will deteriorate, and it is easy to break the filaments. In addition, due to the requirement of the structure of the nascent fiber to be uniform inside and outside, and at the same time to prevent the sudden cooling of the biomass polylactic acid melt, resulting in the entanglement of macromolecular chains and affecting the strength of the finished filament, in order to ensure the spinning quality, it is necessary to add a slow cooling and heat preservation treatment to the filaments coming down from the spinneret before entering the blowing cooling. Therefore, a slow cooler 7 is provided in the tandem machine, and a heater is provided in the slow cooler 7 to keep the filaments warm, and the monomers, oligomers, etc. are sucked and processed through the monomer suction component 8 subsequently to ensure the quality of the tow.

[0131] Optionally, the slow cooler 7 provides a hot air environment of 180 - 210 °C, so that the biomass polylactic acid melt can be temporarily retained in the hot air of 180 - 210 °C for a period of time without rapid cooling. The outer ring blowing component 9-1 in the combined cooling mechanism 9 uses hot air of 25 - 35 °C. The side blowing can be provided with stable and clean cooling air by an air conditioning system. When spinning polylactic acid industrial filament fibers, the side blowing component 9-3 in the combined cooling mechanism 9 provides cooling air with an air temperature of (19 - 22 °C) ±1 °C, a duct pressure of 800 Pa, a wind speed unevenness rate of ≤±5%, a relative humidity of 85 ± 5%, and a wind speed of 0.5 - 0.8 m / s.

[0132] It should be understood that when the side blowing cooling is not ideal, it will have a greater impact on the physical indexes of the tow. If the temperature of the side blowing is too low, due to the rapid cooling of the fiber, a situation will occur where the outer layer of the fiber solidifies rapidly while the inner core of the fiber is still in the melt state, making the fiber form a skin-core fiber. The skin-core fiber is stiff and hard, and the draw ratio in the subsequent process will be significantly reduced and the strength will decrease; on the contrary, if the temperature of the side blowing cooling device is too high, due to incomplete cooling of the fiber, there will be more hairiness during the production process, and even mutual adhesion between single fibers is likely to occur during the spinning and winding process. This tandem machine can ensure the quality of the tow fibers by providing the above-mentioned appropriate side blowing temperature.

[0133] Example 8

[0134] Based on the polylactic acid industrial fiber spinning, drawing and winding tandem machine of Example 1, please refer to Figures 27 to 30 , this example provides a double-sided oiling mechanism, including multiple pairs of oil nozzles 11-3. Each pair of oil nozzles 11-3 includes two oil nozzles 11-3 located on the radial two sides of the to-be-oiled tow 11-4 respectively. Each pair of oil nozzles 11-3 is configured to be close to each other in the top view direction to form a spinning state, and to be far away from each other in the top view direction to form a threading state.

[0135] Specifically, a plurality of pairs of oil nozzles 11-3 are used to oil the to-be-oiled tow 11-4. Each pair of oil nozzles 11-3 oils one tow 11-4. Each pair of oil nozzles 11-3 includes two oil nozzles 11-3, and the two oil nozzles 11-3 are respectively located on both sides of the tow 11-4. The oil nozzles 11-3 are set to be movable, so that different positions of the oil nozzles 11-3 can form a spinning state for oiling the tow 11-4 and a threading state for threading the tow 11-4, which is convenient for actual operation.

[0136] By using the oil nozzles 11-3 to respectively oil both sides of the to-be-oiled tow 11-4, the purpose of oiling both sides of the tow 11-4 is achieved, which can increase the bundling property and antistatic property of the polylactic acid fiber, reduce the resistance of fiber stretching, and the function of uniformly spraying oil on the tow 11-4 can increase the cohesion between monofilaments in the tow 11-4, improve stretching and thus reduce hairiness, and improve the full bobbin rate of the finished product. It is especially suitable for the drawing and winding of polylactic acid industrial filament fibers.

[0137] Optionally, as Figure 27 and Figure 28 shown, the two oil nozzles 11-3 belonging to each pair of oil nozzles 11-3 among the plurality of pairs of oil nozzles 11-3 are staggeredly arranged in the height direction, and then a spinning state as Figure 29 shown can be formed. In the top view direction, there is an overlapping area between the two oil nozzles 11-3 to hold the spun yarn and fully oil both sides of the oil nozzles 11-3.

[0138] Optionally, as Figure 27 and Figure 28 shown, the double-sided oiling mechanism further includes a first mounting plate 11-5a, a cylinder 11-1, a bottom plate 11-8, and a first wire guide hook 11-6a. The first mounting plate 11-5a is fixedly connected to the oil nozzle 11-3. One end of the cylinder push rod 11-2 of the cylinder 11-1 is fixedly connected to the first mounting plate 11-5a. The cylinder 11-1 is fixedly installed on the bottom plate 11-8. The bottom end of the first mounting plate 11-5a is placed against the bottom plate 11-8. The first wire guide hook 11-6a is fixedly installed on the first mounting plate 11-5a, and the first wire guide hook 11-6a is arranged on the bottom side of the oil nozzle 11-3. When the cylinder push rod 11-2 extends, a spinning state as Figure 27 shown is formed; when the cylinder push rod 11-2 retracts, it drives the first mounting plate 11-5a and the first wire guide hook 11-6a fixedly connected to the first mounting plate 11-5a to retract, separating each pair of oil nozzles 11-3 to form a threading channel in the middle. Among them, the cylinder 11-1 is configured with an electrical control system to electrically control the extension, retraction, or maintaining the stationary state of the cylinder push rod 11-2. In other implementable ways, the cylinder 11-1 can be replaced with power components such as a motor or an oil cylinder. By using the cylinder 11-1, it has the advantage of a clean medium.

[0139] Optionally, as shown in Figure 27 and Figure 28 shown, the double-sided oiling mechanism further includes a first oil collecting box 11-7a. The first oil collecting box 11-7a is fixedly installed on the first mounting plate 11-5a, and the first oil collecting box 11-7a is arranged on the bottom side of the oil nozzle 11-3. The top of the first oil collecting box 11-7a is open to collect the oil liquid falling from the oil nozzle 11-3 during spinning. The first oil collecting box 11-7a is further provided with a recovery pipeline to uniformly recover the oil liquid.

[0140] Optionally, as shown in Figure 29 and Figure 30 shown, all the oil nozzles 11-3 on the same radial side of the to-be-oiled tow 11-4 are fixedly installed on the same first mounting plate 11-5a, so as to facilitate the unified control of the movement of the oil nozzles 11-3 on the same side of all the tows 11-4.

[0141] The double-sided oiling mechanism provided in this embodiment has the advantages of uniform oil spraying, clean oil return, no chain drive to eliminate noise pollution, silent drive, compact structure, and the oil nozzle 11-3 is more delicate and easier to maintain than the oil wheel.

[0142] Embodiment 9

[0143] Based on the double-sided oiling mechanism of Embodiment 8, it includes multiple pairs of oil nozzles 11-3. Each pair of oil nozzles 11-3 includes two oil nozzles 11-3 respectively located on both radial sides of the to-be-oiled tow 11-4. Each pair of oil nozzles 11-3 is configured to approach each other in the top view direction to form a spinning state, and to move away from each other in the top view direction to form a threading state. Another feasible implementation manner of the double-sided oiling mechanism is provided in this embodiment. Specifically, as shown in Figure 31 and Figure 32 shown, the double-sided oiling mechanism further includes a rotating shaft 11-9. The rotating shaft 11-9 is fixedly connected to the oil nozzle 11-3, and the rotating shaft 11-9 is configured to drive the oil nozzle 11-3 to rotate. In this embodiment, the oil nozzle 11-3 moves by rotating to respectively form a spinning state as shown in Figure 32 shown, and a threading state as shown in Figure 33 or Figure 34 shown.

[0144] Optionally, as shown in Figure 31As shown, the double-sided oiling mechanism further includes a second mounting plate 11-5b, a second oil collecting box 11-7b, and a second wire guiding hook 11-6b. The second mounting plate 11-5b is fixedly connected to the nozzle 11-3. The second oil collecting box 11-7b is fixedly connected to the second mounting plate 11-5b, and the second oil collecting box 11-7b is arranged on the bottom side of the nozzle 11-3. The second wire guiding hook 11-6b is fixedly connected to the second mounting plate 11-5b. The second oil collecting box 11-7b is used to collect the oil liquid. The second mounting plate 11-5b provides the mounting positions for the second oil collecting box 11-7b and the second wire guiding hook 11-6b. When the rotating shaft 11-9 moves, the second mounting plate 11-5b, the second oil collecting box 11-7b, the second wire guiding hook 11-6b, and the nozzle 11-3 all move along with the rotating shaft 11-9.

[0145] Optionally, the rotating shaft 11-9 includes a damping rotating shaft 11-9. With the damping rotating shaft 11-9 arranged, during threading, manually operate it to the threading state, and then turn it back to the spinning state during spinning.

[0146] The double-sided oiling mechanism provided in this embodiment has the advantages of uniform oil spraying, clean oil return, no chain drive to eliminate noise pollution, noise reduction drive, compact structure, and the nozzle 11-3 is more delicate and easier to maintain than the oil wheel.

[0147] In an implementable threading method, as Figure 33 shown, during threading, the nozzles 11-3 in the left column can remain stationary, and the nozzles 11-3 in the right column all rotate by a certain angle, such as 15° to 30°. At this time, each filament bundle 11-4 is first hung on the nozzles 11-3 in the left column respectively, and then the nozzles 11-3 in the lower row are turned back to their original positions, that is, as Figure 32 shown, the filament bundles 11-4 are hung on the nozzles 11-3 in the right column respectively, and the threading of the filaments is completed. In an implementable threading method, as Figure 34 shown, during threading, the nozzles 11-3 in both the left column and the right column rotate by a certain angle, such as 15° to 30°. At this time, each filament bundle 11-4 is hung on the nozzles 11-3 in the left column and the right column respectively, and then the nozzles 11-3 in the left column and the right column are turned back to their original positions, and the threading of the filaments is completed.

[0148] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0149] 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 equivalent technologies, the present invention also intends to include these modifications and variations therein.

Claims

1. A fiber spinning, drawing and winding combined machine for the polylactic acid industry, characterized in that, the fiber spinning, drawing and winding combined machine for the polylactic acid industry includes a spinning device and a drawing and winding device. The spinning device includes a screw extruder, an extrusion head, a melt conveying pipeline, a spinning box, a spinning component, a slow cooler, a monomer suction component, a combined cooling mechanism and a duct component arranged in sequence according to the production process. The drawing and winding device includes a double-sided oiling mechanism, a cutting and suction device, a pre-networker, a filament splitting roller, a first pair of low-temperature hot rollers, a second pair of high-temperature drawing hot rollers, a third pair of high-temperature drawing hot rollers, a fourth pair of drawing and setting hot rollers, a fifth setting hot roller group, a sixth relaxation guide disk, a porcelain wire guide hook, a main networker and a winding machine arranged in sequence according to the production process; The filament bundle passes through the double-sided oiling mechanism, the cutting and suction device and the pre-networker in sequence from the duct component until it is conveyed to the filament splitting roller. The drawing and winding device and the spinning device are configured to be arranged in parallel, so that the filament bundle between the spinning device and the filament splitting roller is arranged in the vertical direction and is tangent to the filament splitting roller; The screw extruder includes a screw sleeve and a screw passing through the screw sleeve. The screw includes a feeding section, a compression section and a metering section arranged in sequence. The screw sleeve includes: a gas collection chamber on the inner wall at the junction of the compression section and the metering section; and an exhaust hole communicated with the gas collection chamber; wherein, an opening and closing valve for opening and closing the exhaust hole is installed on the screw sleeve. The screw sleeve includes a butt-jointed first screw sleeve and a second screw sleeve. A sealing gasket is arranged between the first screw sleeve and the second screw sleeve. The first screw sleeve, the sealing gasket, the second screw sleeve and the screw jointly enclose the gas collection chamber; Along the material conveying direction in the screw extruder, the metering section is sequentially provided with a first double-thread structure, a diamond-shaped separating structure and a second double-thread structure. The diamond-shaped separating structure is integrally milled into a diamond shape or processed with diamond pins; Along the material conveying direction in the screw extruder, the diameter of the diamond-shaped separating structure gradually decreases and the diamond arrangement density gradually decreases; A plurality of grooved V-shaped grooves are laid along the spiral ring distribution on the screw of the first double-thread structure part; The screw edges of the second double-thread structure are equidistant and of equal height.

2. The fiber spinning, drawing and winding combined machine for the polylactic acid industry according to claim 1, characterized in that, the fifth setting hot roller group includes: a heat preservation cover box, which is provided with an incoming filament channel and an outgoing filament channel for the filament bundle to pass through, at least four heat setting rollers, which are arranged in sequence according to the production process and are all arranged inside the heat preservation cover box; and a heating source for heating the filament bundle in the heat preservation cover box in an environment of 70-120°C.

3. The fiber spinning, drawing and winding combined machine for the polylactic acid industry according to claim 2, characterized in that, the heating source includes an inductive heating source, a steam heating source or a hot air heating source; when the heating source includes the inductive heating source, it is used for heat setting the fiber spinning for the polylactic acid industry with the setting temperature in the first preset range, and the heat setting rollers are all arranged as inductive heating and setting hot rollers; When the heating source includes the steam heating source, it is used for heat setting the polylactic acid industrial fiber spinning with a setting temperature in the second preset range. A steam inlet is provided at a lower position on the side wall of the heat preservation hood box, and a steam outlet is provided at a higher position on the side wall of the heat preservation hood box. The steam inlet and the steam outlet are provided on opposite sides of the heat preservation hood box, and the steam heating source conveys hot steam into the heat preservation hood box; When the heating source includes the hot air heating source, it is used for heat setting the polylactic acid industrial fiber spinning with a setting temperature in the third preset range. A plurality of heating plates are arranged in the heat preservation hood box, the heating plates are arranged at intervals from the heat setting rollers, and the heating plates are arranged close to the tow in the heat preservation hood box; 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.

4. The polylactic acid industrial fiber spinning drawing and winding combined machine according to claim 2, characterized in that The splitting roller is wound around by the tow for 1 circle, the heating temperature of the splitting roller is zero, and the spinning speed is 550 - 650 m / min; The first pair of low-temperature heat rollers is wound around by the tow for 6.5 - 7.5 circles, the heating temperature of the first pair of low-temperature heat rollers is 65 - 90 °C, and the spinning speed is 605 m / min; The second pair of high-temperature drawing heat rollers is wound around by the tow for 6.5 - 7.5 circles, the heating temperature of the second pair of high-temperature drawing heat rollers is 100 - 140 °C, and the spinning speed is 1950 m / min. The drawing ratio of the first pair of low-temperature heat rollers to the second pair of high-temperature drawing heat rollers is 2.5 - 3.5 times; The third pair of high-temperature drawing heat rollers is wound around by the tow for 6.5 - 7.5 circles, the heating temperature of the third pair of high-temperature drawing heat rollers is 110 - 150 °C, and the spinning speed is 3500 m / min. The drawing ratio of the second pair of high-temperature drawing heat rollers to the third pair of high-temperature drawing heat rollers is 1.5 - 2 times; The fourth pair of drawing and setting heat rollers is wound around by the tow for 6.5 - 7.5 circles, the heating temperature of the fourth pair of drawing and setting heat rollers is 110 - 150 °C, and the spinning speed is 3900 m / min. The drawing ratio of the third pair of high-temperature drawing heat rollers to the fourth pair of drawing and setting heat rollers is 1.1 - 1.3 times; The heating temperature of the fifth setting heat roller group is 70 - 120 °C, and the spinning speed is 4250 m / min. The drawing ratio of the fourth pair of drawing and setting heat rollers to the fifth setting heat roller group is 1.02 - 1.05 times.

5. The polylactic acid industrial fiber spinning drawing and winding combined machine according to claim 1, characterized in that The spinning box includes: A metering pump, a pump plate, and a pump seat that are connected in sequence; A box body pipeline that communicates the pump plate and the pump seat; and A melt sealing gasket and an anti-corrosion sealing gasket. The pump plate, the melt sealing gasket, the anti-corrosion sealing gasket, and the pump seat are stacked in sequence. The melt sealing gasket and the anti-corrosion sealing gasket are both provided with through holes for the box body pipeline communicating the pump plate and the pump seat to pass through.

6. The fiber spinning, drawing and winding combined machine for polylactic acid industry as described in claim 1, characterized in that, the spinning component includes: a component body; a gland, a melt distributor, a multi-layer filter screen and a spinneret plate, which are sequentially arranged in the inner channel of the component body along the melt flow direction; and a ball layer, a filter layer and a distribution plate, which are sequentially arranged in layers in the inner channel of the melt distributor along the melt flow direction, and the ball layer includes a plurality of balls placed on the filter layer.

7. The fiber spinning, drawing and winding combined machine for polylactic acid industry as described in claim 1, characterized in that, the combined cooling mechanism includes an outer ring blowing component, a lifting component and a side blowing component arranged in sequence. The lifting component includes a telescopic hose and a lifting power component. The top end of the telescopic hose is communicated with the outer ring blowing component, and the bottom end is communicated with the side blowing component. The lifting power component is arranged between the outer ring blowing component and the side blowing component; the combined cooling mechanism and the spinning component are detachably arranged, and the lifting power component is configured to drive the outer ring blowing component to approach or move away from the spinning component.

8. The fiber spinning, drawing and winding combined machine for polylactic acid industry as described in claim 7, characterized in that, the spinning component, the slow cooler and the monomer suction component are relatively fixedly arranged, the outer ring blowing component of the combined cooling mechanism and the monomer suction component are detachably arranged, and the lifting power component of the combined cooling mechanism is used to drive the outer ring blowing component to approach or move away from the monomer suction component.

9. The fiber spinning, drawing and winding combined machine for polylactic acid industry as described in claim 1, characterized in that, the double-sided oiling mechanism includes multiple pairs of oil nozzles. Each pair of oil nozzles includes two oil nozzles respectively located on the radial two sides of the to-be-oiled tow. Each pair of oil nozzles is configured to approach each other in the top view direction to form a spinning state, and move away from each other in the top view direction to form a threading state.

Images