CN216192925U - Fiber spinning drafting and winding combination machine for polylactic acid industry - Google Patents

Abstract

The utility model discloses a fiber spinning, drafting and winding combination machine for polylactic acid industry, relates to the technical field of spinning production, and solves the technical problem that a polylactic acid tow has deflection difficulty when entering a drafting and winding device in the related technology. In the combination machine, the spinning device comprises a screw extruder, an extrusion head and a channel component which are sequentially arranged according to the production process, and the drafting and winding device comprises a double-sided oiling mechanism, a shearing and sucking yarn and a winding machine which are sequentially arranged according to the production process; the filament bundle sequentially passes through the double-sided oiling mechanism, the shearing and sucking device and the pre-interlacer from the channel part until being conveyed to the filament separating roller, and the drafting and winding device is configured in parallel with the spinning device, so that the filament bundle between the spinning device and the filament separating roller is arranged along the vertical direction and is tangent to the filament separating roller. The parallel arrangement of the lower tows does not deflect after being led out from the spinning device and entering the drawing and winding device, so that the tows are prevented from being damaged due to friction caused by high deflection, and the parallel arrangement of the lower tows is particularly applied to the production of FDY spinning of fibers for the polylactic acid industry.

Description

Fiber spinning drafting and winding combination machine for polylactic acid industry

Technical Field

The utility model relates to the technical field of spinning production, in particular to a fiber spinning drafting and winding combination machine for polylactic acid industry.

Background

The fiber filament spinning drafting winding equipment for polylactic acid industry is mostly formed by modifying other types of equipment, and the biggest defect is that the product quality and the performance are unstable.

Biobased polylactic acid tows are relatively fragile with respect to petroleum synthetic fibers, and in order to avoid damage due to strong deflection and entanglement and to avoid different physical properties, it is not permissible to exceed certain limit values when the filaments are deflected.

SUMMERY OF THE UTILITY MODEL

The application provides a fiber spinning drafting and winding combination machine for polylactic acid industry, which solves the technical problem that the deviation difficulty exists when polylactic acid tows enter a drafting and winding device in the related technology.

The application provides a fiber spinning, drafting and winding combination machine for polylactic acid industry, which comprises a spinning device and a drafting and winding device, wherein the spinning device comprises a screw extruder, an extrusion head, a melt conveying pipeline, a spinning box, a spinning assembly, a slow cooler, a monomer suction part, a combined cooling mechanism and a channel passage part which are sequentially arranged according to a production process; the tows sequentially pass through the double-sided oiling mechanism, the shearing and sucking device and the pre-interlacer from the channel part until being conveyed to the splitting roller, and the drafting and winding device and the spinning device are configured in parallel, so that the tows between the spinning device and the splitting roller are arranged in the vertical direction and tangent to the splitting roller.

Optionally, the fifth shaping hot roller set comprises a heat-insulating cover box, at least four heat-shaping rollers and a heating source, the heat-insulating cover box is provided with a filament inlet channel and a filament outlet channel for the filament bundle to pass through, the at least four heat-shaping rollers are sequentially arranged according to the production process, the heat-shaping rollers are all arranged in the heat-insulating cover box, and the heating source is used for heating the filament bundle in the heat-insulating cover box at 70-120 ℃.

Optionally, the heating source comprises an inductive heating source, a steam heating source, or a hot air heating source; when the heating source comprises an inductive heating source, the heating source is used for carrying out heat setting on the polylactic acid industrial fiber spinning with the setting temperature within a first preset range, and the heat setting rollers are arranged in the form of inductive heating setting hot rollers; when the heating source comprises a steam heating source, the heating source is used for carrying out heat setting on the polylactic acid industrial fiber spinning with the setting temperature within a second preset range, a steam inlet is formed in the lower part of the side wall of the heat-insulating cover box, a steam outlet is formed in the higher part of the side wall of the heat-insulating cover box, the steam inlet and the steam outlet are formed in the two opposite sides of the heat-insulating cover box, and the steam heating source is used for conveying hot steam into the heat-insulating cover box; when the heating source comprises a hot air heating source, the heating source is used for carrying out heat setting on the polylactic acid industrial fiber spinning with the setting temperature within a third preset range, a plurality of heating plates are arranged in the heat-insulating cover box, the heating plates and the heat-setting rollers are arranged at intervals, and the heating plates are arranged close to the tows in the heat-insulating cover box; the first preset range, the second preset range and the third preset range are sequentially reduced and are respectively greater than or equal to 70 ℃ and less than or equal to 120 ℃.

Optionally, the yarn dividing roller is wound for 1 circle by the yarn bundle, the heating temperature of the yarn dividing roller is zero, and the spinning speed is 550-650 m/min; the first pair of low-temperature hot rollers is wound by tows for 6.5-7.5 circles, the heating temperature of the first pair of low-temperature hot rollers is 65-90 ℃, the spinning speed is 605m/min, and the filament dividing rollers and the first pair of low-temperature hot rollers are kept at a speed of 1: a speed ratio of 1.01; the second pair of high-temperature drawing hot rollers is wound by the filament bundle for 6.5 to 7.5 circles, the heating temperature of the second pair of high-temperature drawing hot rollers is 100-; the third pair of high-temperature drawing hot rollers is wound by the filament bundle for 6.5 to 7.5 circles, the heating temperature of the third pair of high-temperature drawing hot rollers is 110-150 ℃, the spinning speed is 3500m/min, and the drawing times of the second pair of high-temperature drawing hot rollers and the third pair of high-temperature drawing hot rollers are 1.5 to 2 times; the fourth pair of drafting and shaping hot rollers is wound by the filament bundle for 6.5 to 7.5 circles, the heating temperature of the fourth pair of drafting and shaping hot rollers is 110-150 ℃, the spinning speed is 3900m/min, and the drafting multiple of the third pair of high-temperature drafting hot rollers and the fourth pair of drafting and shaping hot rollers is 1.1 to 1.3 times; the heating temperature of the fifth shaping hot roller group is 70-120 ℃, the spinning speed is 4250m/min, and the draft multiple of the fourth pair of drafting shaping hot rollers and the fifth shaping hot roller group is 1.02-1.05 times.

Optionally, the screw extruder comprises a threaded sleeve and a screw penetrating through the threaded sleeve, the screw comprises a feeding section, a compression section and a metering section which are sequentially arranged, the threaded sleeve comprises a gas collecting chamber and an exhaust hole, the gas collecting chamber is formed in the inner wall of the junction of the compression section and the metering section, the exhaust hole is communicated with the gas collecting chamber, and an opening and closing valve for opening and closing the exhaust hole is installed on the threaded sleeve.

Optionally, the spinning box comprises a metering pump, a pump plate, a pump seat, a box pipeline, a melt sealing gasket and an anti-corrosion sealing gasket, the metering pump, the pump plate and the pump seat are sequentially connected, the box pipeline comprises a communicating pump plate and a pump seat, the pump plate, the melt sealing gasket, the anti-corrosion sealing gasket and the pump seat are sequentially stacked, and the melt sealing gasket and the anti-corrosion sealing gasket are provided with through holes for the box pipeline of the communicating pump plate and the pump seat to penetrate through.

Optionally, the spinning assembly comprises an assembly body, a gland, a melt distributor, a plurality of layers of filter screens, a spinneret plate, a ball layer, a filter layer and a distribution plate, wherein the gland, the melt distributor, the plurality of layers of filter screens and the spinneret plate are sequentially arranged in an inner channel of the assembly body along the melt flow direction, the ball layer, the filter layer and the distribution plate are sequentially arranged in the inner channel of the melt distributor layer by layers along the melt flow direction, and the ball layer comprises a plurality of balls arranged on the filter layer.

Optionally, the combined cooling mechanism comprises an outer ring blowing component, a lifting component and a side blowing component which are sequentially arranged, the lifting component comprises a flexible hose and a lifting power component, the top end of the flexible hose is communicated with the outer ring blowing component, the bottom end of the flexible hose is communicated with the side blowing component, and the lifting power component is arranged between the outer ring blowing component and the side blowing component; the combined cooling mechanism and the spinning assembly are arranged in a separable mode, and the lifting power piece is configured to drive the outer ring blowing component to be close to or far away from the spinning assembly.

Optionally, the spinning assembly, the slow cooler and the monomer suction part are fixedly arranged relatively, the outer annular blowing part and the monomer suction part of the combined cooling mechanism are arranged in a separable mode, and the lifting power part of the combined cooling mechanism is used for driving the outer annular blowing part to be close to or far away from the monomer suction part.

Optionally, the double-sided oiling mechanism comprises a plurality of pairs of oil nozzles, each pair of oil nozzles comprises two oil nozzles respectively positioned at two sides of the radial direction of the tows to be oiled, and each pair of oil nozzles are configured to be close to each other in a top view direction to form a spinning state and to be far away from each other in a top view direction to form a spinning state.

The beneficial effect of this application is as follows: the application provides a fibre spinning draft winding combine for polylactic acid industry, including spinning equipment and draft take-up device, the silk bundle gets into the draft take-up device through spinning equipment, this application adopts parallel configuration with draft take-up device on equipment layout, specifically for the silk bundle from spinning equipment in proper order through two-sided oiling mechanism, cut inhale silk and pre-interlacer until conveying to the branch silk roller, so that the silk bundle between spinning equipment and the branch silk roller arranges and tangent with the branch silk roller along the vertical direction, this kind of parallel arrangement down the silk bundle follow the spinning equipment draw back go into the draft take-up device after not taking place to deflect, thereby avoid higher deflection to bring the friction and damage the silk bundle, especially use in the production of polylactic acid industry fibre FDY spinning.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.

Fig. 1 is a front view of a fiber spinning, drafting and winding combination machine for polylactic acid industry provided in example 1;

FIG. 2 is a side view of the structure shown in FIG. 1;

FIG. 3 is a top view of the screw extruder, extrusion head, melt delivery conduit and manifold of FIG. 1;

FIG. 4 is a side view of the fifth set of shaped heat rolls of FIG. 1;

FIG. 5 is a front view of the fifth patterned thermo roll set of FIG. 1 using an inductive heat source;

FIG. 6 is a front view of the fifth pattern hot roll set of FIG. 1 using a steam heating source;

FIG. 7 is a front view of the fifth fixing hot roll set of FIG. 1 using a hot air heating source;

FIG. 8 is a schematic view showing the overall structure of a screw extruder provided in example 3;

FIG. 9 is a schematic view of a portion of the structure at A in FIG. 8;

FIG. 10 is a schematic cross-sectional comparison of G1-G1, G2-G2, G3-G3 in FIG. 9;

FIG. 11 is an enlarged view of a portion of FIG. 8 at B;

FIG. 12 is a schematic view of another alternative embodiment of FIG. 11;

FIG. 13 is a schematic view of another alternative embodiment of FIG. 11;

FIG. 14 is an enlarged view of a portion of FIG. 8 at C;

FIG. 15 is an enlarged view of a portion of FIG. 8 at D;

FIG. 16 is an enlarged view of a portion of FIG. 8 taken along line E-E;

FIG. 17 is a schematic view of the overall structure of a spinning beam provided in example 4;

FIG. 18 is a horizontal cross-sectional view of the structure shown in FIG. 17;

FIG. 19 is a vertical cross-sectional view of the structure shown in FIG. 17;

FIG. 20 is an enlarged view of a portion of FIG. 19 at F;

FIG. 21 is a schematic cross-sectional view taken at J-J of FIG. 20;

FIG. 22 is a schematic structural view of a spinning pack provided in example 5;

FIG. 23 is a schematic structural view showing a state where an outer ring blowing member is lifted in a combined cooling mechanism according to embodiment 6;

FIG. 24 is a side view of the structure shown in FIG. 23;

FIG. 25 is a schematic structural view illustrating a state in which the outer ring blowing member is dropped in the combined cooling mechanism shown in FIG. 23;

FIG. 26 is a side view of the structure shown in FIG. 25;

FIG. 27 is a front view of the double-sided oiling mechanism provided in example 8 in a spinning state;

FIG. 28 is a front view of the structure of FIG. 27 in the green state;

FIG. 29 is a top view of a plurality of the structures of FIG. 27 in a spun state;

FIG. 30 is a top plan view of the structure of FIG. 29 in the green state;

FIG. 31 is a front view of another double-sided oiling mechanism provided in example 9;

FIG. 32 is a top view of a plurality of the structures of FIG. 31 in a spun state;

FIG. 33 is a top view of the structure of FIG. 32 in a green state;

fig. 34 is another top view of the structure of fig. 32 in a green state.

Detailed Description

The embodiment of the application provides a fiber spinning, drafting and winding combination machine for polylactic acid industry, and solves the technical problem that the polylactic acid tows have deflection difficulty when entering a drafting and winding device in the related technology.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

a fiber spinning drafting and winding combination machine for polylactic acid industry comprises a spinning device and a drafting and winding device, wherein the spinning device comprises a screw extruder, an extrusion head, a melt conveying pipeline, a spinning box, a spinning assembly, a slow cooler, a monomer suction part, a combined cooling mechanism and a channel part which are sequentially arranged according to a production process, and the drafting and winding device comprises a double-sided oiling mechanism, a shearing suction yarn, a pre-interlacer, a yarn dividing roller, a first pair of low-temperature hot rollers, a second pair of high-temperature drafting hot rollers, a third pair of high-temperature drafting hot rollers, a fourth pair of drafting and shaping hot rollers, a fifth shaping hot roller set, a sixth loosening guide disc, a porcelain piece hook, a main network device and a winding machine which are sequentially arranged according to the production process; the tows sequentially pass through the double-sided oiling mechanism, the shearing and sucking device and the pre-interlacer from the channel part until being conveyed to the splitting roller, and the drafting and winding device and the spinning device are configured in parallel, so that the tows between the spinning device and the splitting roller are arranged in the vertical direction and tangent to the splitting roller.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

Example 1

Referring to fig. 1 to fig. 3, the present embodiment provides a fiber spinning, drafting and winding combination machine for polylactic acid industry, including a spinning device 100 and a drafting 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, which are sequentially arranged according to a production process, and the drafting and winding device 200 includes a double-sided oiling mechanism 11, a shearing and suction yarn 12, a pre-networking device 13, a yarn dividing roller 14, a first pair of low-temperature hot rollers 15, a second pair of high-temperature drafting hot rollers 16, a third pair of high-temperature drafting hot rollers 17, a fourth pair of drafting and shaping hot rollers 18, a fifth shaping hot roller set 19, a sixth loosening guide disc 20, a porcelain hook 21, a main networking device 22 and a winding machine 23, which are sequentially arranged according to the production process; the filament bundle passes through the double-sided oiling mechanism 11, the shearing and sucking 13 and the pre-interlacer 13 from the duct part 10 in sequence until being conveyed to the filament separating roller 14, the drafting and winding device 200 and the spinning device 100 are configured in a parallel configuration, so that the filament bundle between the spinning device 100 and the filament separating roller 14 is arranged in a vertical direction, and the filament bundle between the spinning device 100 and the filament separating roller 14 is tangent to the filament separating roller.

The parallel arrangement of the lower tows does not deflect after being led out from the spinning device 100 and then entering the drawing and winding device 200, so that the tows are prevented from being damaged due to friction caused by high deflection, and the parallel arrangement of the lower tows is particularly applied to the production of FDY spinning of fibers for the polylactic acid industry.

The type selection of the dividing roll 14 comprises a tension dividing roll pair or a feeding roll. When the type of the wire separating roller 14 is a tension wire separating roller pair, the space arrangement is facilitated, and the cost is saved. The type of the yarn separating roller 14 is selected to be a feeding roller, and the yarn is held to a certain degree so as to be convenient for yarn separation.

Unlike other spinning methods such as terylene, polylactic acid is heated to a certain temperature, the molecular structure of the fiber is changed, and then the fiber is shaped.

Referring to fig. 5, in the present embodiment, the fifth shaping heat roller set 19 includes a heat-insulating cover box 19-5, a heating source and at least four heat-shaping rollers, the heat-insulating cover box 19-5 is provided with a filament inlet channel 19-6 and a filament outlet channel 19-8 for the filament bundle 19-7 to pass through, the at least four heat-shaping rollers are sequentially disposed according to the production process and are all disposed in the heat-insulating cover box 19-5, and the heating source is used for heating the filament bundle 19-7 in the heat-insulating cover box 19-5 at 70-120 ℃.

In the scheme of replacing the conventional pair of setting rollers with the fifth setting hot roller set 19, the number of the setting rollers is increased, the setting rollers are arranged in the heat-insulating cover box 19-5, the spinning range is increased by increasing paths in a limited space, the strict requirements on the setting length and the setting time during spinning polylactic acid spinning are facilitated, and the setting effect can be more sufficient. The speeds of the heat setting rollers of the fifth heat setting roller group 19 can be separately adjusted, which is beneficial to adjusting and controlling the setting steps. The fifth shaping hot roller group 19 needs to ensure that the tows 19-7 enter the heat-insulating cover box 19-5 in the upward direction and are output downwards, so the number of the heat-shaping rollers in the heat-insulating cover box 19-5 is preferably controlled to be 4, and 6 or 8 schemes can be provided.

Optionally, referring to fig. 4 and 5, the fifth heat setting roller set 19 includes four heat setting rollers, namely a first heat setting roller 19-1, a second heat setting roller 19-2, a third heat setting roller 19-3 and a fourth heat setting roller 19-4, which are sequentially arranged according to the production process, and the filament bundle 19-7 passes through the filament inlet channel 19-6 and sequentially passes through the first heat setting roller 19-1, the second heat setting roller 19-2, the third heat setting roller 19-3 and the fourth heat setting roller 19-4 until passing through the filament outlet channel 19-8. As shown in fig. 5, the first heat setting roller 19-1 is disposed higher than the second heat setting roller 19-2, the third heat setting roller 19-3 is equal in height to the first heat setting roller 19-1, and the fourth heat setting roller 19-4 is equal in height to the second heat setting roller 19-2.

Optionally, the heating source comprises an inductive heating source, a steam heating source, or a hot air heating source. As shown in fig. 5, when the heating source includes an inductive heating source, the heating source is used for heat setting the polylactic acid industrial fiber spinning with the setting temperature in the first preset range, and the heat setting rollers are all arranged as inductive heat setting hot rollers. The induction heating setting is relatively uniformly heated, but the power consumption is high, the cost is high, and the induction heating setting yarn is used for the long yarn for the bio-based polylactic acid industry with high setting temperature and has higher requirements on various indexes.

As shown in fig. 6, when the heating source comprises a steam heating source, the heating source is used for performing heat setting on the polylactic acid industrial fiber spinning with the setting temperature within the second preset range, a steam inlet 19-5a is formed in the lower portion of the side wall of the heat-preserving cover box 19-5, a steam outlet 19-5b is formed in the higher portion of the side wall of the heat-preserving cover box 19-5, the steam inlet 19-5a and the steam outlet 19-5b are formed in the opposite sides of the heat-preserving cover box 19-5, the steam heating source is used for conveying hot steam into the heat-preserving cover box 19-5, the hot steam is specifically input into the heat-preserving cover box 19-5 through the steam inlet 19-5a, and the hot-set filament bundle 19-7 is output from the steam outlet 19-5 b.

As shown in fig. 7, when the heating source comprises a hot air heating source, the heating source is used for heat setting the polylactic acid industrial fiber spinning with the setting temperature in a third preset range, a plurality of heating plates 19-9 are arranged in the heat-preserving cover box 19-5, the heating plates 19-9 and the heat-setting rollers are arranged at intervals, and the heating plates 19-9 are arranged close to the filament bundles 19-7 in the heat-preserving cover box 19-5. The temperature control can be performed by heat setting through the heating plate 19-9.

Because of the nature of the polylactic acid fiber, the setting temperature is generally required to be not more than 120 ℃ and not less than 70 ℃, in one possible embodiment, the first preset range, the second preset range and the third preset range are sequentially reduced, and are respectively more than or equal to 70 ℃ and less than or equal to 120 ℃, and according to the reduction of the setting temperature, an inductive heating source, a steam heating source or a hot air heating source is sequentially selected. Optionally, the first preset range is greater than 110 ℃ and less than or equal to 120 ℃, the second preset range is greater than 90 ℃ and less than or equal to 110 ℃, and the third preset range is greater than or equal to 70 ℃ and less than or equal to 90 ℃. Optionally, the polylactic acid industrial filament with the setting temperature of 110-120 ℃ is subjected to inductive heating setting. Optionally, the filaments for polylactic acid industry with the setting temperature of 95-105 ℃ are subjected to steam heating setting. Optionally, the filaments for polylactic acid industry with the setting temperature of 70-90 ℃ are set by hot air.

Alternatively, as shown in FIG. 7, in the hot air heat setting, the heating plate 19-9 includes a heating plate 19-9 provided at an inlet in the heat-insulating jacket box 19-5 and another type of heating plate 19-9 provided between subsequent heat setting rolls. As the temperature change at the inlet position, namely the area after entering the filament channel 19-6, is larger, the filament bundle 19-7 is arranged by penetrating through the heating plate 19-9 at the inlet, and the section of the corresponding heating plate 19-9 is arranged in a U shape. The subsequent heating plate 19-9 is arranged between the two heat setting rollers, which is beneficial to the spatial arrangement in the heat-insulating cover box 19-5 and the smaller specification arrangement of the heat-insulating cover box 19-5.

Optionally, as shown in fig. 1, the drawing and winding device 200 further includes a sixth slack guide 20, a porcelain godet 21, a main winder 22 and a winder 23, which are sequentially disposed after the fifth set hot roll group 19 according to the production process. The sixth slack guide disc 20 plays a role in loosening and eliminating tension, the tows are wound by the sixth slack guide disc 20, then sent to the main network device 22 through the porcelain wire guide hook 21 to be knotted, and then sequentially sent to the winding machine 23 to be wound after being knotted.

The fiber spinning, drafting and winding combination machine for polylactic acid industry of the embodiment can produce 4-16 different varieties of filaments for bio-based polylactic acid industry.

Example 2

Based on the fiber spinning, drafting and winding combination machine for polylactic acid industry in embodiment 1, the present embodiment sets specific parameters of the splitting roller 14, the first pair of low-temperature heat rollers 15, the second pair of high-temperature drafting heat rollers 16, the third pair of high-temperature drafting heat rollers 17, the fourth pair of drafting and shaping heat rollers 18 and the fifth pair of shaping heat rollers 19. Specifically, the dividing roller 14 winds the filament bundle for 1 circle, the heating temperature of the dividing roller 14 is zero, and the spinning speed is 550-650m/min in a non-heating state. The first pair of low-temperature hot rollers 15 are wound by tows for 6.5-7.5 circles, the heating temperature of the first pair of low-temperature hot rollers 15 is 65-90 ℃, the spinning speed is 605m/min, and the filament separating roller 14 and the first pair of low-temperature hot rollers 15 keep a speed of 1: a speed ratio of 1.01. The second pair of high temperature drawing hot rollers 16 winds 6.5 to 7.5 times through the filament bundle, the heating temperature of the second pair of high temperature drawing hot rollers 16 is 100-. The third pair of high temperature drafting hot rollers 17 is wound by the filament bundle for 6.5 to 7.5 circles, the heating temperature of the third pair of high temperature drafting hot rollers 17 is 110-150 ℃, the spinning speed is 3500m/min, and the drafting multiple of the second pair of high temperature drafting hot rollers 16 and the third pair of high temperature drafting hot rollers 17 is 1.5 to 2 times. The fourth pair of drafting and shaping hot rollers 18 winds 6.5 to 7.5 turns by the tows, the heating temperature of the fourth pair of drafting and shaping hot rollers 18 is 110-150 ℃, the spinning speed is 3900m/min, and the drafting multiple of the third pair of high-temperature drafting hot rollers 17 and the fourth pair of drafting and shaping hot rollers 18 is 1.1 to 1.3 times. The heating temperature of the fifth shaping hot roller group 19 is 70-120 ℃, the spinning speed is 4250m/min, and the draft multiple of the fourth pair of drafting shaping hot rollers 18 and the fifth shaping hot roller group 19 is 1.02-1.05 times.

Alternatively, the heating temperature of the sixth relaxation guide disk 20 is zero, and is in a non-heating state.

Alternatively, the roll shell surfaces of the dividing roll 14, the first pair of low-temperature heat rolls 15, the second pair of high-temperature drafting heat rolls 16, the third pair of high-temperature drafting heat rolls 17, the fourth pair of drafting shaping heat rolls 18, the fifth shaping heat roll group 19 and the sixth relaxation guide disk 20 may all be ceramic arrangements.

Example 3

Referring to fig. 8 and 11, based on the fiber spinning, drawing, winding and combining machine for polylactic acid industry in embodiment 1, the embodiment discloses a screw extruder comprising a screw sleeve 1-a and a screw 1-b penetrating the screw sleeve 1-a, wherein the screw 1-b comprises a feeding section 1-5d, a compression section (as shown in fig. 8, the compression section is represented by a first compression section 1-5c and a second compression section 1-5b, and can be in other forms) and a metering section 1-5a, the screw sleeve 1-a comprises a gas collection chamber 1-3g and a gas vent 1-3d, the gas collection chamber 1-3g is located on the inner wall of the junction of the compression section and the metering section 1-5a, the gas vent 1-3d is communicated with the gas collection chamber 1-3g, wherein, the screw sleeve 1-a is provided with an opening and closing valve 1-3 for opening and closing the exhaust hole 1-3 d.

The screw sleeve 1-a is externally provided with an external heater to provide heat, the screw rod 1-b comprises a feeding section 1-5d, a compression section and a metering section 1-5a which are sequentially arranged, when the polylactic acid raw material enters the feeding section 1-5d, the temperature of the solid gradually rises one step by one step, the polylactic acid raw material is changed into a molten melt under the action of shearing heat among the raw materials, and the solid material is compressed, sheared and fully melted to a liquid phase in the compression section. When the bio-based polylactic acid raw material is heated, a small part of the raw material is unstable in structure and is subjected to chemical change, hydrolysis phenomenon occurs, the generated gas seriously affects subsequent spinning, the gas is collected through a gas collecting chamber 1-3g positioned at the tail end of a compression section and is controlled by an opening and closing valve 1-3, so that the gas generated by hydrolysis is intensively discharged from exhaust holes 1-3d, and the gas is removed in time when a melt enters a metering section 1-5a, so that the serious adverse effect of the hydrolyzed gas on spinning is overcome, the adverse situation of broken ends is improved, and the quality and the spinning efficiency of the subsequent spinning are ensured.

Optionally, as shown in fig. 8 and fig. 11, the thread insert 1-a includes a first thread insert 1-1 and a second thread insert 1-4 which are butted with each other, the screw rod 1-b is inserted into the first thread insert 1-1 and the second thread insert 1-4, the first thread insert 1-1 is provided with an exhaust hole 1-3d and is provided with an open/close valve 1-3, an inner wall of one end of the first thread insert 1-1 close to the second thread insert 1-4 is recessed, a sealing gasket 1-3f is arranged between the first thread insert 1-1 and the second thread insert 1-4, and/or the inner wall of one end of the second threaded sleeve 1-4 close to the first threaded sleeve 1-1 is concavely arranged, and the first threaded sleeve 1-1, the sealing gasket 1-3f, the second threaded sleeve 1-4 and the screw rod 1-b jointly enclose to form a gas collecting chamber 1-3 g.

The gas collection chamber 1-3g is formed by arranging the insert 1-a in the form of a combination of the first insert 1-1 and the second insert 1-4 so as to be assembled. The sealing gasket 1-3f is arranged between the first threaded sleeve 1-1 and the second threaded sleeve 1-4, namely the sealing gasket 1-3f is arranged at the butt joint face of the first threaded sleeve 1-1 and the second threaded sleeve 1-4, the first threaded sleeve 1-1 and the second threaded sleeve 1-4 can be connected through bolts, and the sealing performance of the gas collecting chamber 1-3g is ensured through the sealing gasket 1-3 f.

Wherein, the inner wall of one end of the second screw sleeve 1-4 close to the first screw sleeve 1-1 is concavely arranged, which means that on the basis that the inner wall of one end of the first screw sleeve 1-1 close to the second screw sleeve 1-4 is concavely arranged, the inner wall of one end of the second screw sleeve 1-4 close to the first screw sleeve 1-1 can be concavely arranged to form a part of a gas collecting chamber 1-3g in a matching way; the inner wall of the end of the first screw sleeve 1-1 close to the second screw sleeve 1-4 can be separately recessed, or the inner wall of the end of the second screw sleeve 1-4 close to the first screw sleeve 1-1 can be separately recessed in other possible embodiments.

Optionally, the feeding sections 1-5d are arranged in single-thread screws 1-b to complete the feeding; the compression section is arranged in a double-thread screw 1-b mode to reduce the shearing heat of the compression section and further reduce the over-temperature phenomenon of the compression section.

Optionally, referring to fig. 8, 14 and 15, the compression section includes a first compression section 1-5c and a second compression section 1-5b, the first compression section 1-5c and the second compression section 1-5b are arranged as a double-thread screw 1-b, and the screw 1-b includes a feeding section 1-5d, a first compression section 1-5c, a second compression section 1-5b and a metering section 1-5a which are 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 are gradually reduced, and the groove depth change degree of the second compression section 1-5b is smaller than that of the first compression section 1-5 c.

The groove depths of the first compression sections 1-5c are gradually reduced, and the groove depths have larger change degrees, so that solid-phase materials are fully fused to liquid phases by compression and shearing; and then the solid-phase material passes through the second compression section 1-5b, the groove depth of the second compression section 1-5b is gradually reduced, and the change degree of the groove depth is small, so that the solid-phase material is further fully melted into liquid, and gas generated after hydrolysis is stored in a relative space. Wherein, the groove depth variation degree refers to the groove depth variation amount corresponding to the unit length of the material conveying direction in the screw extruder. The greater and lesser degree of variation in groove depth means that the two are relative.

Optionally, as shown in FIG. 8, the screw sleeve 1-a comprises an electro-contact pressure gauge 1-2, and the measuring end of the electro-contact pressure gauge 1-2 is communicated with the gas collecting chamber 1-3 g. The gas collecting chamber 1-3g is used for collecting gas generated by hydrolysis of the materials, the gas pressure generated when the gas reaches a certain volume is reacted in an electric contact pressure gauge 1-2, and the action of opening and closing the valve 1-3 is assisted by the electric contact pressure gauge 1-2.

Alternatively, as shown in fig. 8 and 11, the screw sleeve 1-a includes a base 1-c disposed at an outer edge, the exhaust hole 1-3d is disposed in the base 1-c in an L shape, two ends of the exhaust hole 1-3d are respectively communicated with the gas collecting chamber 1-3g and the external atmosphere, and the opening and closing valve 1-3 is installed at the base 1-c. The opening and closing valve 1-3 comprises a valve body 1-3b, a packing seal 1-3c, a valve rod 1-3a and a bushing 1-3e, wherein the valve body 1-3b is partially arranged in the base 1-c, and the other part of the valve body protrudes out of the base 1-c (as shown in fig. 11, the valve body 1-3b is partially arranged in the base 1-c, and the other part of the valve body is exposed out of the base 1-c), the valve rod 1-3a is movably arranged in the valve body 1-3b, and the valve body 1-3b is partially arranged in the base 1-c, so that the valve rod 1-3a is also movably arranged in the base 1-c. The packing seal 1-3c is arranged in the base 1-c and between the base 1-c and the valve rod 1-3a to seal the clearance area between the base 1-c and the valve rod 1-3a, so that the gas is exhausted from the exhaust hole 1-3 d. The end part of the valve rod 1-3a is arranged in a cambered surface to seal or conduct the L-shaped bent part of the exhaust hole 1-3 d. The bush 1-3e is arranged at the bent part of the exhaust hole 1-3dL of the base 1-c, and the bush 1-3e is configured to be abutted against the end part arc surface of the valve rod 1-3a so as to ensure good sealing property when the valve rod 1-3a closes the exhaust hole 1-3 d.

The exhaust holes 1-3d are plugged or communicated by operating the positions of the valve rods 1-3 a. Further, the gas in the gas collection chamber 1-3g is discharged by opening the vent hole 1-3d under the indication of the electric contact pressure gauge 1-2.

In an alternative embodiment, as shown in FIG. 12, the opening and closing valves 1 to 3 may be provided by using manual needle type valves 1 to 3 i. In an alternative embodiment, as shown in FIG. 13, the opening/closing valve 1-3 may be provided by an electric needle valve 1-3j, wherein the electric needle valve 1-3j is controlled to open in a fixed value in conjunction with the electro-contact pressure gauge 1-2. In one possible embodiment, as shown in FIG. 11, one end of the exhaust holes 1-3d is directly connected to the outside atmosphere. In one possible embodiment, as shown in fig. 12 and 13, an electric vacuum pump 1-3h may be added to the end of the exhaust hole 1-3d to rapidly exhaust the 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 and exhaust under the preset gas pressure.

Alternatively, as shown in fig. 9 and 10, the metering section 1-5a sequentially comprises a first double-thread structure 1-5a3, a diamond-shaped separation structure 1-5a2 and a second double-thread structure 1-5a1 along the material conveying direction in the screw extruder, and the diamond-shaped separation structure 1-5a2 is in an integrated milling diamond or diamond-shaped pin machining arrangement. Wherein the upper row of the graph in fig. 10 shows the structure of an integrally milled diamond and the lower row of the graph in fig. 10 shows the structure of a diamond split 1-5a2 machined from diamond pins. The mixing and homogenization of the melt is further facilitated by the diamond split configuration 1-5a2 arrangement.

Optionally, as shown in fig. 16, a plurality of grooved V-shaped grooves 1-5a 3-1-4 are distributed and paved on the screw rods 1-b of the first double-thread structure 1-5a3 part along a spiral ring shape, and the groove length is set to the whole first double-thread structure 1-5a3, so as to achieve the beneficial effect of reducing the unevenness of the temperature and the intrinsic viscosity of the melt.

Alternatively, as shown in FIGS. 9 and 10, the diamond-shaped separation structures 1-5a2 have a gradually decreasing diameter and a gradually decreasing density of diamond-shaped arrangements in the material conveying direction in the screw extruder. Wherein the diameter of the diamond-shaped separation structure 1-5a2 is gradually reduced by the horizontal dotted line in fig. 10, ensuring no material backflow and gradually reducing the shear heat; comparing the numbers of diamonds in one circle in sequence through the screenshots G3-G3, G2-G2 and G1-G1 in FIG. 10 shows that the arrangement of diamonds has gradually reduced density, the higher density at the beginning is favorable for stirring, and the lower density at the subsequent is favorable for reducing shear heat. Through the design, no circulation dead angle exists, no raw material is retained, the phenomenon of material carbonization is avoided, and the continuous operation of the spinning process is facilitated.

In one embodiment, the length of the feed section 1-5D of the single flight is set to 9D to 11D, the length of the compression section of the double flight is controlled to 10D to 11D, and the length of the metering section 1-5a is set to 9D to 15D. In one possible embodiment, the first double thread structure 1-5a3 is provided in a length range of 4D to 10D, the diamond split structure 1-5a2 is provided in a length of 3D, and the second double thread structure 1-5a1 is provided in a length of 2D. In one possible embodiment, the length to diameter ratio of screw 1-b is controlled to (28-34): 1. In one possible embodiment, the temperature of the screw extruder is zoned at 160 ℃ to 240 ℃ and the pressure of the screw extruder after filtration is controlled at 80-120kg/cm 2. In one possible embodiment, the screw edges of the feeding section 1-5d are in the same diameter and single screw pitch, the screw edges of the second double-thread structure 1-5a1 are in the same distance and the same height, and are fully melted to enable the output melt to be uniform, stabilize the pressure of the melt extrusion outlet, and facilitate the subsequent spinning to realize quantitative, constant-pressure and constant-temperature extrusion from a machine head in the mixing extrusion section.

Example 4

Referring to fig. 17 to 21, based on the fiber spinning, drafting and winding combination machine for polylactic acid industry of embodiment 1, the embodiment discloses a spinning box 4, which includes a metering pump 4-13, a pump plate 4-14, a pump base 4-16, a box pipe 4-18, a melt seal 4-15a and an anti-corrosion seal 4-15b, the metering pump 4-13, the pump plate 4-14 and the pump base 4-16 are sequentially connected, the box pipe 4-18 includes a communicating pump plate 4-14 and a pump base 4-16, the pump plate 4-14, the melt seal 4-15a, the anti-corrosion seal 4-15b and the pump base 4-16 are sequentially stacked, the melt sealing gasket 4-15a and the anti-corrosion sealing gasket 4-15b are both provided with through holes for the tank pipelines 4-18 communicated with the pump plates 4-14 and the pump bases 4-16 to penetrate through.

Referring to fig. 1, the molten raw material enters the spinning box 4 through the melt conveying pipeline 3, specifically, the molten raw material advances along the box pipelines 4-18 in the spinning box 4, and the molten raw material sequentially passes through the pump bases 4-16, the pump plates 4-14, the metering pumps 4-13, then passes through the pump plates 4-14 and the pump bases 4-16 again, and is conveyed to the spinning assembly 6 of the lower box 4-1 to form tows, and then the tows enter the subsequent process. The raw material melt is conveyed between the pump plate 4-14 and the pump base 4-16, specifically along a part of the tank pipeline 4-18 communicating the pump plate 4-14 and the pump base 4-16, and correspondingly, corresponding through holes are arranged in the pump plate 4-14 and the pump base 4-16 for the raw material melt to flow through.

It will be appreciated that gaskets 4-15 are provided between the pump plates 4-14 and the pump mounts 4-16 to enhance the sealing of the melt flow between the pump plates 4-14 and the pump mounts 4-16. The seal 4-15 is typically a melt seal 4-15a, and as shown in particular in fig. 19 and 20, the melt seal 4-15a is compressed to perform a sealing function when the pump plate 4-14 is fixedly connected to the pump mount 4-16, for example, by screwing. On the basis of selecting the melt sealing gasket 4-15a, the scheme is additionally provided with a sealing gasket 4-15, specifically, a layer of anti-corrosion sealing gasket 4-15b is arranged between the melt sealing gasket 4-15a and the pump seat 4-16 to form a pump plate 4-14, the melt sealing gasket 4-15a, the anti-corrosion sealing gasket 4-15b and the pump seat 4-16 which are sequentially stacked, and a box pipeline 4-18 correspondingly communicating the pump plate 4-14 and the pump seat 4-16 penetrates through the melt sealing gasket 4-15a and the anti-corrosion sealing gasket 4-15 b.

The corrosion-proof sealing gaskets 4-15b improve the corrosion of the liquid weak acid of the raw materials to the surfaces of the pump bases 4-16, protect the smoothness of the surfaces of the pump bases 4-16 and ensure the good sealing performance of the melt sealing gaskets 4-15a, so that the disadvantages of sealing defects, material leakage, end breakage caused by insufficient supply of the raw material melt and the like caused by the corrosion of the pump bases 4-16 are improved, and the production of the spinning of the material with weak acid of the raw material melt, such as the fiber spinning for the polylactic acid industry, is facilitated.

As shown in fig. 21, a middle large pipe is shown for the raw material melt to flow through the pump plates 4-14 from the pump bases 4-16, and after being acted by the metering pumps 4-13, the raw material melt is divided into a plurality of pipes, as shown by the four small pipes at the periphery in fig. 21, the raw material melt penetrates through the pump plates 4-14 and the pump bases 4-16 until entering the spinning assemblies 6 corresponding to the small pipes one by one, a plurality of spinning assemblies 6 are distributed on the bottom side of the assembly connecting plates 4-17 along the length direction, and each spinning assembly 6 is provided with an inlet.

As shown in fig. 18, the spinning manifold 4 disclosed in this embodiment includes two pump bases 4-16, and the pump bases 4-16 correspond to the pump plates 4-14, the metering pumps 4-13, the spinning assembly 6, and the corresponding pipe arrangement. Because the metering pump 4-13 is used for continuously and accurately supplying melt to the spinning assembly 6 by utilizing high pressure, the requirement of high-precision metering accuracy is met, and the metering pump transmission component 5 related to the metering pump 4-13 is driven by a permanent magnet synchronous motor direct-connection cycloid pin gear speed reducer and subjected to variable frequency speed regulation as shown in figure 1, each pump is respectively and independently driven, a transmission shaft can be stretched and contracted, and the transmission shaft is provided with a universal coupling and a safety pin protection device.

Optionally, as shown in fig. 19, the spinning box 4 comprises a heat distribution block 4-12, the heat distribution block 4-12 is arranged between the metering pump 4-13 and the housing of the spinning box 4, and the heat distribution block 4-12 surrounds the metering pump 4-13, so that the heat preservation effect on the metering pump 4-13 is improved.

Alternatively, the corrosion protection gasket 4-15b is made of a corrosion-resistant flexible material comprising copper or aluminum, the corrosion protection gasket 4-15b being provided in the form of a copper pad, an aluminum pad, respectively. Optionally, the pump plates 4-14 and the pump bases 4-16 are connected through high temperature resistant standard parts, the high temperature resistant standard parts comprise screws made of 35CrMoA materials, and the high temperature resistant standard parts are adopted to enable disassembly, assembly and replacement to be convenient.

Optionally, as shown in FIG. 19, the manifold 4 further comprises a module connecting plate 4-17, the module connecting plate 4-17 is arranged in the lower manifold 4-1, and the module connecting plate 4-17 is used for connecting with the spinning module 6. The manifold channels 4-18 comprise melt distribution outlet channels 4-18a communicating the pump block 4-16 with the module connecting plate 4-17, the melt distribution outlet channels 4-18a being optionally arranged in the form of tubes in the spinning manifold 4. The melt distribution output channel 4-18a comprises a first melt distribution output channel 4-18a1 and a second melt distribution output channel 4-18a2, one end of the first melt distribution output channel 4-18a1 is communicated with the pump seat 4-16, one end of the second melt distribution output channel 4-18a2 is communicated with the assembly connecting plate 4-17, and the other end of the first melt distribution output channel 4-18a1 is hermetically connected with the other end of the second melt distribution output channel 4-18a2 through a detachable connecting piece.

Compared with the prior art that the pump seat 4-16 and the component connecting plate 4-17 are communicated through a plurality of steel pipes serving as melt distribution pipelines in a welding mode, the pump seat 4-16, the component seat and the steel pipes are connected into an inseparable whole, the spinning box 4 is single in function and free of interchangeability, and the pump seat 4-16, the component connecting plate 4-17 and the steel pipes are connected into a whole, so that the steel pipes are bent more, pipelines are easy to block and not easy to clean, and even a cleaning tool is adopted, the cleaning tool is difficult to clean.

Through the detachable connection arrangement of the two sections of the melt distribution output channels 4-18a of the embodiment, the first section of the melt distribution output channel 4-18a1 and the second section of the melt distribution output channel 4-18a2 can be detached in an optional situation, so that the requirement of interchangeability is met, and the application range is expanded; the two sections are detachably arranged, so that the two sections can be separated and cleaned when being blocked, and the melt distribution output channels 4-18a can be cleaned conveniently. It will be appreciated that the two sections of the melt distribution outlet channel 4-18a are removably connected and it is also necessary to ensure the tightness of the two sections.

Optionally, as shown in fig. 1, 17 and 19, the spinning box 4 comprises an upper box body 4-2 and a lower box body 4-1, the upper box body 4-2 is mounted 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 mounted in the upper box body 4-2 along the vertical direction, the spinning box 4 is matched with the melt conveying pipeline 3, and the box body pipeline 4-18 further comprises a melt conveying pipeline 3 and a pump seat 4-16 communicated with each other. The spinning box 4 is combined by the upper box body 4-2 and the lower box body 4-1, which is beneficial to reasonably arranging elements, reducing the volume of the box body and being beneficial to the assembly process.

Alternatively, as shown in fig. 17, the upper box 4-2 is heated by a heater, the upper box 4-2 is internally provided with a metal filler 4-9, and the metal filler 4-9 is used for replacing the conventional biphenyl steam to transfer heat to achieve the effect of uniform temperature. The heater comprises an upper box body basic heater 4-4, an upper box body auxiliary heater 4-5 and an upper box body adjusting heater 4-6, so that one or more groups of different heating modes can be specifically adopted, and the beneficial effects of quick heating, heat preservation, temperature adjustment and the like can be realized.

As shown in FIG. 17, the lower box 4-1 is provided with a heat transfer oil inlet 4-7 and a heat transfer oil outlet 4-8, the heat transfer oil inlet 4-7 and the heat transfer oil outlet 4-8 are communicated with a container type heat transfer oil boiler, and a pump is correspondingly configured. The heating and temperature control of the upper box body 4-2 and the lower box body 4-1 are independently controlled and mutually related by arranging the upper box body 4-2 and the lower box body 4-1 and matching respective heating modes.

Optionally, as shown in fig. 19, the upper tank 4-2 includes an upper tank temperature measuring element 4-10, and the lower tank 4-1 includes a lower tank temperature measuring element 4-11, which respectively detect the metal filler 4-9 in the upper tank 4-2 and the heat conducting oil in the lower tank 4-1. And then can adopt intelligent temperature control system, can reduce the energy consumption, be favorable to the environmental protection, in time feed back data, adjust heating power, realize intelligent accuse temperature, and then controllable temperature precision 1 ℃.

Optionally, the manifold 4 includes a manifold melt pressure measuring element 4-3, the manifold melt pressure measuring element 4-3 being mounted to the upper manifold 4-2. If the initial pressure of the spinning assembly 6 is more than 9Mpa in normal spinning, data support is provided for normal spinning through the spinning box melt pressure measuring element 4-3.

Optionally, when the spinning box 4 is in a use state, the temperature in the upper box body 4-2 is controlled to be 210-225 ℃, the temperature in the upper box body 4-2 is relatively lower, the melt is mainly protected to be in a low-temperature dormant state in the conveying process, and the degradation and hydrolysis of materials are reduced; when the spinning assembly is in use, the temperature of the box body 4-1 is controlled to be 225-245 ℃, so that the melt is enabled to increase the fluidity in the spinning assembly 6 after passing through the assembly connecting plates 4-17 and to be mixed more fully, the effect of more uniform pressure rise of the assembly is achieved, and various unevenness of tows are reduced.

Example 5

Referring to fig. 22, the present embodiment discloses a spinning assembly 6 based on the fiber spinning, drafting and winding combination machine for polylactic acid industry of embodiment 1, which includes an assembly 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, wherein the gland 6-2, the melt distributor 6-3, the multi-layer filter screen 6-10 and the spinneret 6-4 are sequentially disposed in an inner channel of the assembly body 6-5 along a 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 distribution body 6-3 in layers along the flow direction of the melt, and the ball layer 6-8 comprises a plurality of balls arranged on the filter layer 6-9.

Specifically, the assembly body 6-5 is used as a main shell of the spinning assembly 6, the assembly body 6-5 is provided with an inner channel, a gland 6-2, a melt distributing body 6-3, a multi-layer filter screen 6-10 and a spinneret plate 6-4 are sequentially arranged in the inner channel of the assembly body 6-5, and the gland 6-2 is used for installing the rest parts in the assembly body 6-5. The melt distributor 6-3 is also provided with an inner channel, and the melt distributor 6-3 is sequentially provided with a ball layer 6-8, a filter layer 6-9 and a distribution plate 6-11 in the inner channel. As shown in FIG. 22, the melt distributor 6-3 and distributor plate 6-11 may be integrally provided.

When the spinning assembly is in a working state, the melt passes through the gland 6-2, sequentially passes through the ball layer 6-8, the filter layer 6-9, the distribution plate 6-11, the multi-layer filter screen 6-10 and the spinneret plate 6-4, and is output in the spinneret plate 6-4 in a filament bundle mode, the spinning assembly 6 adopts balls of the ball layer 6-8 to replace well-known sea sand, and adopts ball filtration to improve the unfavorable phenomenon of raw material and sea sand agglomeration, prolong the service life, facilitate the more sufficient mixing of materials in the melt distributor 6-3 and improve the uniformity of the melt.

Optionally, the filter layers 6-9 are arranged in a sintered metal plate and made of sintered materials, the ball layers 6-8 are matched with the sintered metal plate to replace the well-known sea sand and the multilayer filter screens 6-10, the filter area and the volume of the sintered metal plate are about 50% more than those of the multilayer filter screens 6-10, the spinning assembly 6 of the embodiment adopts ball filtration to prevent the raw materials and the sea sand from quickly agglomerating, so that the materials are more fully mixed in the melt distribution body 6-3 cavity, the service life is prolonged, the heat transfer uniformity of the filter assembly is improved, and the uniformity of the melt is improved. The ball of the present embodiment can be made of stainless steel material to form a stainless steel ball. The balls can also be made of other metal materials.

Optionally, as shown in fig. 22, the spin pack assembly 6 further includes a lock nut 6-1, an outer peripheral edge of the lock nut 6-1 is threadedly coupled to an inner side of the assembly body 6-5, and an inner peripheral edge of the lock nut 6-1 abuts against the bottom side and an outer peripheral edge of the cover 6-2. When the locking nut 6-1 is screwed, the locking nut 6-1 is tightly connected with the assembly body 6-5, the gland 6-2 is tightly pressed in the inner channel of the assembly body 6-5, and then when the spinneret plate 6-4 at the other end is blocked in the inner channel of the assembly body 6-5, a state that 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 can be formed, and the multi-layer filter screen is stably installed in the assembly body 6-5.

Optionally, as shown in fig. 22, a limiting part is arranged on one side of the inner side of the assembly body 6-5 away from the locking nut 6-1, and the limiting part is in concave-convex fit with the spinneret plate 6-4 to limit the spinneret plate 6-4 in the assembly body 6-5. One side of the assembly body 6-5, which is far away from the locking nut 6-1, is in concave-convex fit with the spinneret plate 6-4, specifically, a limiting part is arranged on the inner edge of the assembly body 6-5 in an inward protruding mode, the limiting part can be arranged in an annular mode, the periphery of the spinneret plate 6-4 is correspondingly arranged in a step shape, and the spinneret plate 6-4 is limited in an inner channel of the assembly body 6-5 through the limiting part. Particularly, the limiting part is tightly connected with the spinneret plate 6-4 in the state of installing the locking nut 6-1.

Alternatively, as shown in FIG. 22, the gland 6-2 is provided with internal threads configured to couple with the module connecting plate 4-17 within the manifold to fixedly couple the spin module 6 to the manifold.

Alternatively, as shown in FIG. 22, the spin pack assembly 6 includes a first seal 6-6, the first seal 6-6 being disposed between the gland 6-2 and the assembly web 4-17. It will be appreciated that, on the basis of the gland 6-2 being provided with a path channel for the melt to pass through, the first seal 6-6 may be annular, arranged around the path channel and arranged between the gland 6-2 and the component web 4-17, serving to seal the gap between the gland 6-2 and the component web 4-17. Alternatively, as shown in FIG. 22, the spin pack assembly 6 includes a second seal 6-7, the second seal 6-7 being disposed at the junction of the gland 6-2 and the melt distributor 6-3. The second sealing element 6-7 can be embedded to seal the interface between the gland 6-2 and the melt distributor 6-3.

In one possible embodiment, the gland 6-2, the melt distributor 6-3, the multi-layer filter screen 6-10 and the spinneret 6-4 are arranged in vertical sequence, the ball layer 6-8, the filter layer 6-9 and the distributor plate 6-11 are arranged in vertical sequence, and the entire spinning pack 6 is arranged in the spinning device in vertical sequence.

Example 6

Referring to fig. 23 to 26, based on the fiber spinning, drafting and winding combination machine for polylactic acid industry in embodiment 1, the present embodiment provides a combined cooling mechanism 9, which includes an outer circular blowing component 9-1, a lifting component 9-2 and a side blowing component 9-3, which are sequentially arranged, the lifting component 9-2 includes a flexible hose 9-2a and a lifting power component 9-2b, the top end of the flexible hose 9-2a is communicated with the outer circular blowing component 9-1, the bottom end of the combined cooling mechanism is communicated with a side blowing component 9-3, a lifting power component 9-2b is arranged between an outer ring blowing component 9-1 and the side blowing component 9-3, the combined cooling mechanism 9 and the spinning assembly 6 are arranged in a separable mode, and the lifting power component 9-2b is configured to drive the outer ring blowing component 9-1 to be close to or far away from the spinning assembly 6.

Specifically, the polylactic acid material tows from the spinning assembly 6 pass through the combined cooling mechanism 9, sequentially pass through the outer ring blowing component 9-1, the flexible hose 9-2a of the lifting component 9-2 and the side blowing component 9-3 until entering the next step, in 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 are accumulated on the spinneret surface during the production of the polylactic acid fiber spinning for a period of time, the lifting power component 9-2b acts to move down the outer ring blowing component 9-1, and referring to fig. 23 and 25, and fig. 24 and 26 in particular, the outer ring blowing component 9-1 is relatively separated from the spinning assembly 6, so that the original tight spinning channel is opened by one opening, leaving operating space for the clear board to use, being convenient for regularly clear up the spinneret face, be favorable to the quality and the normal clear-up of spinning, be favorable to improving holistic spinning efficiency.

Alternatively, as shown in fig. 24, the elevating means 9-2 further comprises a vertical moving guide 9-2c, and the vertical moving guide 9-2c is provided between the outer ring blowing means 9-1 and the side blowing means 9-3. The arrangement of the guide rails is beneficial to the motion stability of the outer ring blowing component 9-1 and the telescopic hose 9-2 a. Alternatively, as shown in fig. 24 and 26, the vertical movement guide 9-2c includes a guide rod vertically installed on the side blowing part 9-3 and a guide block fixed to the outer ring blowing part 9-1, the guide rod being penetrated through the guide block. The guide block limits the guide rod, so that the motion stability of the outer ring blowing component 9-1 and the telescopic hose 9-2a is facilitated.

Alternatively, as shown in fig. 24 and 26, the lifting power member 9-2b comprises an air cylinder, a cylinder seat of the air cylinder is fixed on the side blowing part 9-3, and a piston rod of the air cylinder abuts against the bottom side of the outer ring blowing part 9-1. In other embodiments, the lifting power member 9-2b may also be in the form of an oil cylinder, a motor, etc.

Alternatively, as shown in fig. 23 and 24, the outer ring blowing part 9-1 includes an outer ring blowing upper wind box 9-1a, an outer ring blowing lower wind box 9-1b, an outer ring blowing cylinder 9-1c, an outer ring blowing wind guide 9-1d, and an outer ring blowing wind channel 9-1e, the outer ring blowing upper wind box 9-1a is stacked on the outer ring blowing lower wind box 9-1b, the outer ring blowing cylinder 9-1c is provided in the outer ring blowing upper wind box 9-1a, the outer ring blowing wind guide 9-1d is provided in the outer ring blowing lower wind box 9-1b, the outer ring blowing cylinder 9-1c is provided on the outer ring blowing wind guide 9-1d, an inner passage through which the filament bundles pass is provided in the outer ring blowing wind guide 9-1d, the filament bundles ejected from the spinning block 6 are arranged to pass through the inner cavity of the outer ring blowing cylinder 9-1c in sequence, An inner channel of the outer ring blowing wind guide member 9-1d, a flexible hose 9-2a and a side blowing component 9-3. One end of the outer ring blowing air duct 9-1e is arranged as an air inlet, the other end is communicated with the air guide surface of the outer ring blowing air guide member 9-1d, so that the inlet air is guided into the middle of the outer ring blowing upper air box 9-1a and the outer ring blowing cylinder 9-1c, and the cylinder surface of the outer ring blowing cylinder 9-1c is provided with air holes.

Specifically, stable and clean hot air can be provided for the outer ring blowing component 9-1 by the air supply system, specifically, the hot air is blown into an air inlet of the air channel 9-1e through the outer ring, and is guided to the air guide surface of the outer ring blowing air guide component 9-1d along the outer ring blowing air channel 9-1e, the air guide surface of the outer ring blowing air guide component 9-1d can further guide the inlet air into the outer ring blowing upper air box 9-1a and out of the outer ring blowing cylinder 9-1c, and further the inlet air enters the cylinder through air holes in the cylinder surface of the outer ring blowing cylinder 9-1c, and the tows passing through the cylinder are slowly cooled under the surrounding of the hot air. It is to be noted that the outer ring blowing cylinder 9-1c may be selected to have different heights according to actual needs.

Alternatively, the surface of the outer ring blowing cylinder 9-1c may be made of sintered metal mesh, and the surface may be covered with a non-woven fabric. The sintered metal mesh is made of materials, so that gaps can be formed, and hot air can pass through the gaps. In another embodiment, the surface of the outer-ring blowing cylinder 9-1c includes a porous plate and a non-woven fabric is covered on the surface. The arrangement of the porous plate is that a plurality of air holes are directly arranged on the outer ring air blowing cylinder 9-1 c. The porous plate or the sintered metal mesh is made to play a damping role, so that the uniform wind speed and the stable wind pressure are favorably ensured, and the tows are slowly cooled under the surrounding of hot air.

Optionally, the wind temperature provided by the outer ring blowing component 9-1 and the wind temperature provided by the side blowing component 9-3 form a gradient relation from high to bottom with each other along the filament bundle trend; the wind speed provided by the outer annular blowing part 9-1 and the wind speed provided by the lateral blowing part 9-3 form a gradient relationship from slow to fast along the filament bundle. The gradient refers to that the wind temperature changes in a gradually decreasing section by section along the trend, and the wind speed changes in a gradually increasing section by section. Through setting the wind temperature and the wind speed, the tows are well cooled.

Example 7

Based on the fiber spinning, drafting and winding combination machine for polylactic acid industry in embodiment 1 and the combined cooling mechanism 9 provided in embodiment 6, please refer to fig. 23 to fig. 26, which includes a spinning assembly 6, a slow cooler 7, a single suction component 8 and the combined cooling mechanism 9 of embodiment 1 sequentially arranged along the direction of the filament bundle, the spinning assembly 6, the slow cooler 7 and the single suction component 8 are relatively fixedly arranged, an outer circular blowing component 9-1 and the single suction component 8 of the combined cooling mechanism 9 are detachably arranged, and a lifting power component 9-2b of the combined cooling mechanism 9 drives the outer circular blowing component 9-1 to approach or depart from the single suction component 8.

When the biomass polylactic acid is spun, monomers, oligomers and the like contained in the sprayed melt volatilize, and if the bio-based polylactic acid filament bundle is immediately cooled, the fluidity and the tensile property of the filament bundle are poor, and the filament breakage is easy. In addition, as the structure of the nascent fiber requires uniform inside and outside, and simultaneously, in order to prevent the sudden cooling of the biomass polylactic acid melt from causing the entanglement of macromolecular bonds and influencing the strength of finished yarn, the slow cooling and heat preservation treatment is added before the yarn from the spinneret plate enters the blowing cooling process to ensure the spinning quality, a slow cooler 7 is arranged in the combination machine, a heater is arranged in the slow cooler 7 to preserve the heat of the yarn, and monomers, oligomers and the like are sucked and treated by a monomer suction part 8 in the follow-up process to ensure the quality of the yarn bundle.

Optionally, the slow cooler 7 provides a hot air environment at the temperature of 180 ℃ and 210 ℃ so that the biomass polylactic acid melt is temporarily kept in the hot air at the temperature of 180 ℃ and 210 ℃ for a period of time without being rapidly cooled. The outer circular blowing part 9-1 in the combined cooling mechanism 9 adopts hot air with the temperature of 25-35 ℃. The cross-blowing air can be selected to provide stable and clean cooling air by an air conditioning system. When spinning the long-thread fiber for polylactic acid industry, the cross air blowing part 9-3 in the cooling mechanism 9 is combined to provide cooling air with the air temperature (19-22 ℃) plus or minus 1 ℃, the air duct pressure of 800pa, the wind speed irregularity rate of less than or equal to plus or minus 5%, the relative humidity of 85 plus or minus 5% and the wind speed of 0.5-0.8 m/s.

It is understood that when the cross-air cooling is not ideal, the physical index of the tows is greatly influenced. If the temperature of the cross air blow is too low, the outer layer of the fiber is rapidly solidified but the inner core of the fiber is still in a melt state due to the rapid cooling of the fiber, so that the fiber forms a sheath-core fiber, and the subsequent draft multiple is obviously reduced and the strength is reduced due to the stiff and stiff sheath-core fiber; on the contrary, if the temperature of the side-blowing cooling device is too high, broken filaments are increased in the production process due to incomplete fiber cooling, and even the phenomenon that single fibers are adhered to each other easily occurs in the spinning and winding process. This combine can ensure the tow fiber quality through providing the above-mentioned suitable cross air temperature that sets up.

Example 8

Based on the fiber spinning drafting and winding combination machine for polylactic acid industry in embodiment 1, referring to fig. 27 to 30, the embodiment provides a double-sided oiling mechanism, which includes a plurality of pairs of oil nozzles 11-3, each pair of oil nozzles 11-3 includes two oil nozzles 11-3 respectively located at two radial sides of a to-be-oiled filament bundle 11-4, each pair of oil nozzles 11-3 are configured to be close to each other in a top view direction to form a spinning state, and to be far away from each other in the top view direction to form a spinning state.

Specifically, a tow 11-4 to be oiled is oiled through a plurality of pairs of oil nozzles 11-3, each pair of oil nozzles 11-3 is oiled for one tow 11-4, each pair of oil nozzles 11-3 comprises two oil nozzles 11-3, the two oil nozzles 11-3 are respectively positioned on two sides of the tow 11-4, and the oil nozzles 11-3 are arranged to be movable, so that a spinning state for oiling the tow 11-4 and a spinning state for spinning and hanging the tow 11-4 can be formed by the oil nozzles 11-3 being positioned at different positions, and the practical operation is facilitated.

The two sides of the filament bundle 11-4 to be oiled are respectively treated by the oil nozzles 11-3, so that the purpose of oiling two sides of the filament bundle 11-4 is achieved, the bundling property and the antistatic property of the polylactic acid fiber can be increased, the resistance of fiber stretching is reduced, the cohesion between single filaments in the filament bundle 11-4 can be increased by the function of uniformly spraying oil to the filament bundle 11-4, the stretching is improved, the broken filaments are reduced, the full-winding rate of finished products is improved, and the filament yarn drafting and winding device is particularly suitable for filament fiber drafting and winding for the polylactic acid industry.

Alternatively, as shown in fig. 27 and 28, two oil nozzles 11-3 of each of the plurality of pairs of oil nozzles 11-3 are staggered in the height direction, so that the spinning state shown in fig. 29 can be formed, and the two oil nozzles 11-3 have an overlapping area in the top view direction, so that the spinning is suspended and the oil nozzle 11-3 is oiled sufficiently on both sides.

Alternatively, as shown in fig. 27 and 28, the double-sided oiling mechanism further comprises a first mounting plate 11-5a, an air cylinder 11-1, a bottom plate 11-8 and a first guide wire 11-6a, the first mounting plate 11-5a is fixedly connected with the oil nozzle 11-3, one end of an air cylinder push rod 11-2 of the air cylinder 11-1 is fixedly connected with the first mounting plate 11-5a, the air cylinder 11-1 is fixedly mounted on the bottom plate 11-8, the bottom end of the first mounting plate 11-5a abuts against the bottom plate 11-8, the first guide wire 11-6a is fixedly mounted on the first mounting plate 11-5a, and the first guide wire 11-6a is arranged at the bottom side of the oil nozzle 11-3. The cylinder rod 11-2 is extended to form the spinning state shown in fig. 27; the cylinder push rod 11-2 retracts to drive the first mounting plate 11-5a and the first thread guide hook 11-6a fixedly connected with the first mounting plate 11-5a to retract, and each pair of oil nozzles 11-3 are separated to form a middle threading channel. Wherein, the cylinder 11-1 is provided with an electric control system for electrically controlling the cylinder push rod 11-2 to extend, retract or maintain the immovable state. In other embodiments, the cylinder 11-1 can be replaced by a power unit such as a motor or a cylinder. The cylinder 11-1 is used, which has the advantage of cleaning the medium.

Optionally, as shown in fig. 27 and 28, the double-sided oiling mechanism further comprises a first oil receiving box 11-7a, the first oil receiving box 11-7a is fixedly mounted on the first mounting plate 11-5a, and the first oil receiving box 11-7a is arranged at the bottom side of the oil nozzle 11-3. The top of the first oil receiving box 11-7a is arranged in an opening manner so as to recover oil falling from the oil nozzle 11-3 during spinning. The first oil receiving box 11-7a is additionally provided with a recovery pipeline for uniformly recovering oil.

Alternatively, as shown in fig. 29 and 30, all the nipples 11-3 located on the same radial side of the tow to be oiled 11-4 are fixedly mounted on the same first mounting plate 11-5a, so that the movement of the nipples 11-3 on the same radial side of all the tows 11-4 can be controlled uniformly.

The double-sided oiling mechanism provided by the embodiment has the advantages of uniform oil injection, clean oil return, no chain transmission, noise pollution elimination, noise elimination transmission, compact structure and convenience in maintenance due to the fact that the oil nozzles 11-3 are more delicate than oil wheels.

Example 9

A double-sided oiling mechanism according to embodiment 8 comprises a plurality of pairs of oil nipples 11-3, each pair of oil nipples 11-3 includes two oil nipples 11-3 respectively located on both sides in the radial direction of a tow to be oiled 11-4, each pair of oil nipples 11-3 is arranged close to each other in a plan view direction to form a spinning state, and is arranged apart from each other in a plan view direction to form a threading state. This embodiment provides another possible implementation of a double-sided oiling mechanism. Specifically, as shown in fig. 31 and 32, 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 is moved by rotation to form a spinning state as shown in FIG. 32 and a spinning-in state as shown in FIG. 33 or FIG. 34, respectively.

Optionally, as shown in fig. 31, the double-sided oiling mechanism further includes a second mounting plate 11-5b, a second oil receiving box 11-7b and a second guide wire 11-6b, the second mounting plate 11-5b is fixedly connected with the oil nozzle 11-3, the second oil receiving box 11-7b is fixedly connected with the second mounting plate 11-5b, the second oil receiving box 11-7b is disposed at the bottom side of the oil nozzle 11-3, and the second guide wire 11-6b is fixedly connected with the second mounting plate 11-5 b. The oil is collected through the second oil receiving box 11-7b, the mounting positions of the second oil receiving box 11-7b and the second yarn guide hook 11-6b are provided through the second mounting plate 11-5b, and the second mounting plate 11-5b, the second oil receiving box 11-7b, the second yarn guide hook 11-6b and the oil nozzle 11-3 move along with the rotating shaft 11-9 when the rotating shaft 11-9 moves.

Optionally, the rotating shaft 11-9 comprises a damping rotating shaft 11-9, and the damping rotating shaft 11-9 is arranged, so that the spinning-in state is manually operated during spinning-in, and the spinning state is returned during spinning.

In an applicable spinning-in mode, as shown in fig. 33, the left row of oil nozzles 11-3 may be stationary during spinning-in, and the right row of oil nozzles 11-3 are all rotated by a certain angle, for example, 15 ° to 30 °, at this time, each tow 11-4 is hung on the left row of oil nozzles 11-3, and then the lower row of oil nozzles 11-3 is turned back to the original position, that is, as shown in fig. 32, the tow 11-4 is hung on the right row of oil nozzles 11-3, and spinning-in is completed. In one practical way of spinning, as shown in fig. 34, during spinning, the left and right rows of the oil nozzles 11-3 are rotated by a certain angle, for example, 15 ° to 30 °, and then each tow 11-4 is hung on the left and right rows of the oil nozzles 11-3, and then the left and right rows of the oil nozzles 11-3 are rotated back to the original position, thereby completing spinning.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The fiber spinning, drafting and winding combination machine for the polylactic acid industry is characterized by comprising a spinning device and a drafting and winding device, wherein the spinning device comprises a screw extruder, an extrusion head, a melt conveying pipeline, a spinning box, a spinning assembly, a slow cooler, a monomer suction part, a combined cooling mechanism and a channel passage part which are sequentially arranged according to a production process;

the tows sequentially pass through the double-sided oiling mechanism, the shearing and sucking yarn and the pre-interlacer from the channel part until being conveyed to the yarn dividing roller, and the drafting and winding device and the spinning device are configured in a parallel configuration, so that the tows between the spinning device and the yarn dividing roller are arranged in a vertical direction and are tangent to the yarn dividing roller.

2. The fiber spinning, drafting and winding combination machine for polylactic acid industry according to claim 1, wherein the fifth set of shaping heat rollers comprises:

the heat-insulating cover box is provided with a filament inlet channel and a filament outlet channel for the filament bundle to pass through,

at least four heat setting rollers are sequentially arranged according to the production process and are all arranged in the heat-insulating cover box; and

and the heating source is used for heating the tows in the heat-preserving cover box at the temperature of 70-120 ℃.

3. The fiber spinning, drawing and winding combination machine for polylactic acid industry according to claim 2, wherein said heating source comprises an inductive heating source, a steam heating source or a hot air heating source;

when the heating source comprises the inductive heating source, the heating source is used for carrying out heat setting on the polylactic acid industrial fiber spinning with the setting temperature within a first preset range, and the heat setting rollers are arranged in the form of inductive heat setting hot rollers;

when the heating source comprises the steam heating source, the heating source is used for carrying out heat setting on the polylactic acid industrial fiber spinning with the setting temperature within a second preset range, a steam inlet is formed in the lower part of the side wall of the heat-insulating cover box, a steam outlet is formed in the higher part of the side wall of the heat-insulating cover box, the steam inlet and the steam outlet are formed in the two opposite sides of the heat-insulating cover box, and the steam heating source is used for conveying hot steam into the heat-insulating cover box;

when the heating source comprises the hot air heating source, the heating source is used for carrying out heat setting on the polylactic acid industrial fiber spinning with the setting temperature within a third preset range, a plurality of heating plates are arranged in the heat-insulating cover box, the heating plates and the heat-setting rollers are arranged at intervals, and the heating plates are arranged close to tows in the heat-insulating cover box;

the first preset range, the second preset range and the third preset range are sequentially reduced and are respectively greater than or equal to 70 ℃ and less than or equal to 120 ℃.

4. The fiber spinning, drafting and winding combination machine for polylactic acid industry as claimed in claim 2, wherein the dividing roller winds the filament bundle for 1 turn, the heating temperature of the dividing roller is zero, and the spinning speed is 550-650 m/min;

the first pair of low-temperature hot rollers winds the tows for 6.5 to 7.5 circles, the heating temperature of the first pair of low-temperature hot rollers is 65 to 90 ℃, the spinning speed is 605m/min, and the filament dividing rollers and the first pair of low-temperature hot rollers are kept in a ratio of 1: a speed ratio of 1.01;

the second pair of high-temperature drawing hot rollers winds the filament bundle for 6.5 to 7.5 circles, the heating temperature of the second pair of high-temperature drawing hot rollers is 100-;

the third pair of high-temperature drawing hot rollers is wound by the filament bundle for 6.5 to 7.5 circles, the heating temperature of the third pair of high-temperature drawing hot rollers is 110-150 ℃, the spinning speed is 3500m/min, and the drawing times of the second pair of high-temperature drawing hot rollers and the third pair of high-temperature drawing hot rollers are 1.5 to 2 times;

the fourth pair of drafting and shaping hot rollers is wound by the filament bundle for 6.5 to 7.5 circles, the heating temperature of the fourth pair of drafting and shaping hot rollers is 110-150 ℃, the spinning speed is 3900m/min, and the drafting multiple of the third pair of high-temperature drafting hot rollers and the fourth pair of drafting and shaping hot rollers is 1.1 to 1.3 times;

the heating temperature of the fifth shaping hot roller set is 70-120 ℃, the spinning speed is 4250m/min, and the draft multiple of the fourth pair of drafting shaping hot rollers and the fifth shaping hot roller set is 1.02-1.05 times.

5. The fiber spinning, drafting and winding combination machine for polylactic acid industry according to claim 1, wherein the screw extruder comprises a screw sleeve and a screw penetrating the screw sleeve, the screw comprises a feeding section, a compression section and a metering section which are arranged in sequence, and the screw sleeve comprises:

the gas collecting chamber is arranged on the inner wall of the junction of the compression section and the metering section; and

a vent in communication with the gas collection chamber;

wherein the threaded sleeve is provided with an opening and closing valve for opening and closing the exhaust hole.

6. The fiber spinning, drafting and winding combination machine for polylactic acid industry according to claim 1, wherein the spinning box comprises:

the metering pump, the pump plate and the pump seat are connected in sequence;

the tank pipeline comprises a pipeline body which is communicated with the pump plate and the pump seat; and

the pump plate, the melt sealing gasket, the anti-corrosion sealing gasket and the pump seat are sequentially stacked, and the melt sealing gasket and the anti-corrosion sealing gasket are provided with through holes for communicating the pump plate and the pump seat, wherein the box body pipeline penetrates through the through holes.

7. The fiber spinning, drafting and winding combination machine for polylactic acid industry according to claim 1, wherein the spinning assembly comprises:

an assembly body;

the gland bush, 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 flow direction of the melt; and

the ball layer, the filtering layer and the distributing plate are sequentially arranged in the inner channel of the melt distributing body layer by layer along the flow direction of the melt, and the ball layer comprises a plurality of balls arranged on the filtering layer.

8. The fiber spinning, drafting and winding combination machine for polylactic acid industry according to claim 1, wherein the combined cooling mechanism comprises an outer annular blowing component, a lifting component and a side blowing component which are arranged in sequence, the lifting component comprises a flexible hose and a lifting power component, the top end of the flexible hose is communicated with the outer annular blowing component, the bottom end of the flexible hose is communicated with the side blowing component, and the lifting power component is arranged between the outer annular blowing component and the side blowing component;

the combined cooling mechanism is arranged separately from the spinning assembly, and the lifting power piece is configured to drive the outer annular blowing component to be close to or far away from the spinning assembly.

9. The fiber spinning, drawing and winding combination machine for polylactic acid industry according to claim 8, wherein said spinning assembly, said slow cooler and said single suction unit are fixedly disposed relative to each other, said outer circular blowing unit and said single suction unit of said combined cooling mechanism are detachably disposed, and said lifting power unit of said combined cooling mechanism drives said outer circular blowing unit to move closer to or away from said single suction unit.

10. The fiber spinning drafting and winding combination machine for polylactic acid industry as claimed in claim 1, wherein said double-sided oiling mechanism comprises a plurality of pairs of oil nipples, each pair of said oil nipples comprising two oil nipples respectively located at two radial sides of the tow to be oiled, each pair of said oil nipples being disposed close to each other in a plan view to form a spinning state and distant from each other in a plan view to form a threading state.

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