CN110921418A

CN110921418A - Large-tow carbon fiber precursor winding device

Info

Publication number: CN110921418A
Application number: CN201911405999.7A
Authority: CN
Inventors: 王斐; 周亚明; 史蒂夫·阿莫斯
Original assignee: Lanzhou Lan-Star Fiber Co Ltd
Current assignee: Lanzhou Lan-Star Fiber Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-03-27

Abstract

The invention provides a large-tow carbon fiber precursor filament collecting device, which sequentially comprises the following components in the advancing direction of a tow: the atomizing unit is used for spraying water mist to the tows; a drawing unit for drawing the tow out of the atomizing unit; the tow guide bundling unit is used for guiding and bundling tows at different track positions; the tow cross-linking unit is used for mixing and winding at least two tows to form a 'pseudo' tow; and the yarn collecting unit is used for collecting the 'fake' bundle of tows into the yarn box. According to the invention, every 3 bundles of 50K tows on an upstream production line are woven into 1 'pseudo' 150K large tow, the width of the tows is kept, no twist is generated, the tows are safely and stably laid in the filament box, the automatic boxing and collection of the large tow protofilaments are completed, and the production and operation of a subsequent carbonization process are facilitated.

Description

Large-tow carbon fiber precursor winding device

Technical Field

The invention relates to a carbon fiber winding device, in particular to a large-tow carbon fiber precursor winding device.

Background

The existing protofilament yarn collecting equipment is winding equipment, only 3-24K protofilaments can be collected, and large tows above 50K cannot be collected; the maximum collecting weight of the existing yarn drum is 120 kilograms, if the large yarn bundle with the length of more than 50K is collected, the collected yarn bundle length is about 18000m, the yarn collecting length is short, and the subsequent process production is not facilitated; the existing cross winding and yarn collecting mode is easy to wear a yarn bundle, thereby increasing broken yarns in subsequent procedures and influencing the quality of finished products; the existing cross winding and yarn winding mode causes the width of the tows to shrink and forms a rope twisting state, and the tows are difficult to untwist in the subsequent carbonization process.

Disclosure of Invention

Features and advantages of the invention will be set forth in part in the description which follows, or may be obvious from the description, or may be learned by practice of the invention.

In order to overcome the problems in the prior art, the invention provides a large-tow carbon fiber precursor filament collecting device, which sequentially comprises the following components in the advancing direction of a tow:

the atomizing unit is used for spraying water mist to the tows;

a drawing unit for drawing the tow out of the atomizing unit;

the tow guide bundling unit is used for guiding and bundling tows at different track positions;

the tow cross-linking unit is used for mixing and winding at least two tows to form a 'pseudo' tow;

and the yarn collecting unit is used for collecting the 'fake' bundle of tows into the yarn box.

Optionally, the atomizing unit includes a body, the body is provided with a filament inlet groove for the entry of the upstream tow and a filament outlet groove for the downstream of the tow on two opposite side walls of the body, and a water mist spraying pipe is provided in the inner cavity of the body.

Optionally, the number of the water mist spraying pipelines is two, and the two water mist spraying pipelines are respectively located on the upper side and the lower side of the wire inlet groove.

Optionally, the traction unit comprises a rubber roller and four metal rollers arranged from top to bottom, and the first metal roller and the rubber roller combination work together as a squeezing roller pair.

Optionally, the tow guide bundling unit comprises a base capable of moving in multiple directions and a ceramic arc-shaped bending roller rotatably connected to the base.

Optionally, the tow cross-linking unit comprises, in order according to the advancing direction of the tow: mixing head cluster roller, mixing head, cross-linking head cluster roller and cross-linking head.

Optionally, the tow crosslinking unit further comprises a humidifying water roller and a pair of dropping rollers, the humidifying water roller is arranged in front of the crosslinking head, and the pair of dropping rollers is arranged in front of the humidifying water roller.

Optionally, the humidifying water roller comprises a tray containing desalinated water and a metal roller at least partially immersed in the tray.

Optionally, the wire take-up unit includes:

the filament collecting rail is arranged in the direction vertical to the moving direction of the filament bundles;

the wire box can move back and forth on the wire collecting track;

and the chute is arranged above the filament collecting rail and can move along the direction parallel to the moving direction of the filament bundles.

Optionally, the filament take-up unit further comprises a squeezing assembly including a squeezing plate for extending into the filament box to exhaust air, the squeezing plate being movable together with the filament box.

The invention provides a large-tow carbon fiber precursor filament collecting device, which solves the problem that the existing filament collecting device is insufficient in filament collecting length of large tow precursors of more than 50K, so that the next procedure is frequently used for making joints; reducing tow friction points and untwisted take-up.

The features and content of these solutions will be better understood by those skilled in the art from reading the present description.

Drawings

The advantages and realisation of the invention will be more apparent from the following detailed description, given by way of example, with reference to the accompanying drawings, which are given for the purpose of illustration only, and which are not to be construed in any way as limiting the invention, and in which:

fig. 1 is a schematic structural diagram of a large-tow carbon fiber precursor take-up device according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of an atomizing unit according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a traction unit according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a tow guide and bundling unit according to an embodiment of the invention.

FIG. 5 is a schematic structural diagram of a tow crosslinking unit according to an embodiment of the present invention.

FIG. 6 is a schematic front view of a guide groove roll in a tow crosslinking unit according to an embodiment of the present invention.

FIG. 7A is a schematic front view of a mixing head in a tow crosslinking unit according to an embodiment of the present invention.

FIG. 7B is a schematic view of the opening of the mixing head in the tow crosslinking unit according to an embodiment of the present invention.

FIG. 7C is a top view of a mixing head in a tow crosslinking unit according to an embodiment of the present invention.

Fig. 8A is a schematic front view of a cross-link head in a tow cross-linking unit according to an embodiment of the present invention.

Fig. 8B is a schematic view of the opening of the cross-linking head in the tow cross-linking unit according to the embodiment of the present invention.

FIG. 8C is a top view of a cross-link head in a tow cross-linking unit according to an embodiment of the present invention.

FIG. 9 is a schematic structural diagram of a humidifying water roller in a tow crosslinking unit according to an embodiment of the invention.

Fig. 10 is a schematic structural view of a yarn winding unit according to an embodiment of the present invention.

Fig. 11 is a schematic structural view of a yarn winding unit according to an embodiment of the present invention.

Detailed Description

As shown in fig. 1, the invention provides a large-tow carbon fiber precursor filament collecting device, which sequentially comprises an atomizing unit 10, a traction unit 20, a tow guiding and bundling unit 30, a tow crosslinking unit 40 and a filament collecting unit 50 according to the advancing direction of a tow. Wherein:

the atomizing unit 10 is used for adding desalted water and compressed air, and forms water mist in an atomized state through a high-pressure nozzle. The function is as follows: firstly, the tows are cooled, so that an operator can process the tows; secondly, the static electricity of the filament bundle is kept at a lower level, and the filament bundle is prevented from flowing away.

Referring to fig. 2, in this embodiment, the atomizing unit 10 includes a body 11, the body 11 is a hollow box, two opposite side walls of the body 11 are respectively provided with a filament inlet slot 17 for the upstream filament bundle to enter, and a filament outlet slot 19 for the downstream filament bundle to go, an inner cavity of the body 11 is provided with water

mist spraying pipes

13 and 15, the water mist spraying pipes can be arranged at the upper and lower sides of the filament inlet slot, DW (desalted water) and CA (compressed air) are added into the water

mist spraying pipes

13 and 15, atomized water mist is formed by a high pressure nozzle, and DW/CA pressure control is performed by adjusting valves V1 and V2. Moisture content test (post draft sampling):

the more the strand is stretched, the more it wants to shrink, while the strand is under relatively high tension in the previous step. In order to avoid the shrinkage and the relaxation of the tows and to obtain good carbon fiber strength characteristics, a very large traction force is required to pull out the tows in the previous process, and the traction unit can provide the traction force so as to obtain good carbon fiber strength characteristics.

Referring to fig. 3, in this embodiment, the drawing unit 20 is an Ω -shaped driving roller set, and is composed of a rubber roller 22 and four metal rollers 21 arranged from top to bottom, and the first metal roller 21 and the rubber roller 22 on the first metal roller are combined to be an extrusion roller pair to work together. The speed of the metal drive roller 21 is: 20-70 m/min. The speed of the metal drive roller is from the last motor encoder of the upstream process, i.e. the traction device is synchronized with the main line speed. The traction device provides the running speed for other processes of the wire collecting device. Furthermore, in order to keep the metal rollers 21 clean, brushes will be mounted on these rollers.

Different spinning positions require the tow guide bundling unit 40 to conduct guide bundling, the tow guide bundling unit 40 comprises a base and a ceramic arc-shaped bending roller 32 which is rotatably connected to the base and is shown in fig. 4, the cross section of the ceramic arc-shaped bending roller 32 is circular, and the diameter of the ceramic arc-shaped bending roller increases from the center to two ends. The base can move up and down, left and right by 20 mm. The ceramic arc-shaped bending roller is used for guiding and bundling tows in different spinning positions, the height and the left and the right are adjusted by using the base, three 50K tows are bundled together, the edge distance of the tows is 0mm, and the width of the tows is kept unchanged.

At least two tows can be bundled together through the tow guide bundling unit, and the width and the thickness of the tows are kept as consistent as possible. The tow may be 24K or more filaments, for example 50K filaments.

The tow cross-linking unit 40 is used to mix and wind at least two tows into a 'pseudo' tow, for example, three 50K tows into a 'pseudo' 150K tow. Referring to fig. 5 and fig. 6, the tow cross-linking unit 40 sequentially includes, according to the advancing direction of the tow: a guide groove roller 41, a first guide roller 42, a mixing head bundling roller 43, a mixing head 44, a cross-linking head bundling roller 45, a cross-linking head 46, a second guide roller 47, a humidifying water roller 48, a third guide roller 49 and a filament dropping pair roller 65.

In this embodiment, the tow passes through the guide groove roller and the guide roller and then enters the hybrid crosslinking unit. The hybrid crosslinking subunit includes a first guide roller 42, a mixing head cluster roller 43, a mixing head 44, a crosslinking head cluster roller 45, and a crosslinking head 46.

The mixing head cluster roller 43 can be selected as a ceramic cluster roller, and the mixing head cluster roller 43 can be adjusted in height and left and right to adjust the distance between the three strands of filaments again. The compressed air used by the mixing head is controlled to be switched on and off by an electromagnetic valve, and is normally opened in the operation process, and the pressure is 2-5 bar. The front view, the open schematic view and the top view of the mixing head 44 are respectively shown in fig. 7A to 7C, and it can be seen that the mixing head 44 comprises an upper mixing head 81 and a lower mixing head 83 which can be connected in an openable and closable manner, a mixing gap block 85 is arranged between the upper mixing head 81 and the lower mixing head 83, and a plurality of air holes 87 are densely arranged at the top of the mixing head.

The cross-linking head bundling roller 45 can be selected as a ceramic bundling roller, and the cross-linking head bundling roller 45 can be adjusted in height, left and right again to adjust the space between the three strands of filaments again. The compressed air used by the cross-linking head is regulated by an electromagnetic valve, and the pulse can be regulated according to the speed of the production line and the length of the tows is regulated according to 0.1-1.5 m. As shown in fig. 8A to 8C, it can be seen that the cross-linking head 46 includes an upper cross-linking head 82 and a lower cross-linking head 84 that can be connected in an openable and closable manner, a cross-linking gap block 86 is disposed between the upper cross-linking head 82 and the lower cross-linking head 84, and a plurality of groups of air holes 88 are disposed at the top of the cross-linking head, where each group of air holes is, for example, 3.

The tow is blown through air holes in the mixing head and the cross-linking head by pulse air to allow a portion of the tow to be entangled and joined together but not permanently joined, which can be separated by the gravity of the tow.

After the subunits are cross-linked by the tows, the tows become a compact, coherent bundle of fibers. The mixed-strand cross-linking subunit gently blows the monofilament into the other strand by compressed air (cross-mixing) and causes the monofilament to be lapped on both sides of the adjacent strand (interlocking wrap). The 3 strands taken into the box were lightly cross-linked and could be easily separated in subsequent processing steps without damaging the strands.

As shown in fig. 9, the humidifying water roller 48 includes a tray 62 containing desalted water and a metal roller 61 at least partially immersed in the tray, and the tow is humidified by the desalted water adhered to the metal roller 61, and the moisture content of the tow is controlled by the number of revolutions of the metal roller. In this embodiment, the tray 62 is divided into two parts by a baffle, one part is a wetting area for wetting the metal roller, the other part is a circulating area for circulation, and the height of the baffle is smaller than that of the tray 62. The bottom of the circulation area is connected with a circulation tank 63, Desalted Water (DW) is filled in the circulation tank 63, the circulation tank 63 is connected with a circulation pump 64, and the circulation pump 64 is connected with the wetting area and used for conveying the desalted water in the circulation tank 63 into the wetting area. The desalinated water is circulated to the wetting zone via a circulation tank 63 and excess desalinated water in the tray overflows to the circulation zone and is returned to the circulation tank. The circulating tank is provided with 2 circulating pumps and a liquid level controller. The circulating pump is on one side and on the other side. A100-200 mu filter is arranged in front of the circulating pump, and a liquid level controller controls the liquid level of the desalting water tank.

The wire dropping pair roller 65 is composed of a metal roller and a rubber extrusion roller. The surface roughness of the metal roll is 0.2 to 0.3. mu.m. The speed of the metal drive roll is synchronized with the production line speed. The pressure of the rubber roller can be adjusted by a pneumatic unit, so that a certain tension is given to the tows, and the tows are kept to pass through the cross-linking device in a straight line. Rubber roller: 200 mm in diameter and 200 mm in width. Hardness: 90 shore. Linear pressure: 100-150N/cm. The drop pair roller can give a certain tension to the tows and keep the tows to pass through the cross-linking device in a straight line.

Referring to fig. 10 and 11, the filament collecting unit 50 is composed of a chute 51, two

pressing assemblies

53 and 54, and a box-type driving and transferring subunit.

The box type driving and transferring subunit comprises a wire collecting track 55, a transferring track 75,

wire boxes

71, 72 and 73 and a transferring trolley 76, wherein the chute 51 is arranged right above the wire boxes 52(72) through a swing arm and can swing back and forth, and the chute 51 can also be connected with a motor through a connecting rod and used for controlling the swinging amplitude of the chute. The chute was stainless steel with an upper mouth dimension of about 120 x 90 mm and a lower mouth dimension of about 80 x 10 mm and a height of about 500 mm. The moving direction of the silk box is vertical to the moving direction of the silk bundles and moves left and right. Preferably, the distance between the lower end of the chute and the top of the tow is: constantly maintained at about 14cm to 23cm, for example 20 cm.

The

pressing units

53 and 54 include a pressing plate, a connecting rod and a servo motor, the pressing plate is fixed on one end of the connecting rod, and the other end of the connecting rod is swingably fixed on the servo motor through a rotating shaft. The servo motor drives the extrusion plate to move up and down, so that the extrusion plate can extend into the filament box 52, the filament bundles should be tightly pressed in the filament collecting process, the pressing plate is in a long strip shape, the air exhaust is facilitated, and the surface is smooth; and because the connecting rod can swing, the pressing plate can move together with the wire box in the pressing process. In this embodiment, the extrusion subassembly is two, sets up respectively in the silk case two tip departments of controlling of receiving silk in-process, and whenever the silk case removes the tip, just change the clamp plate.

The filament collecting unit 50 flatly lays the filament bundles into the filament box by means of the swinging of the chute and the movement of the filament box, and the two extrusion devices extrude the filament bundle layer in turn. In this embodiment, the take-up unit is provided with 2 extrusion assemblies. When the box is at the opposite end, one of the squeeze assemblies will be activated and vice versa. Typically at this time, the box moving device is stopped for a few seconds, at which time the compression device compresses the tow. During this period, the wire laying action and the chute are not stopped.

In this example, the dimensions of the wire box are 1250 × 900 × 1000 mm. Changing the box is an automated process. When the filament spreading length reaches a set value, the filament spreading system automatically pops the filled filament boxes to the conveying track, and meanwhile, pushes the empty filament boxes to the position below the chute. The length of the laid filament can be measured and counted (the length is about 22000-30000 meters).

The wire box is automatically replaced, and the replacement time is set according to the wire collection length. On the take-up track 55 there must be placed 3 boxes, 1 empty box 71, one box 72 being laid, and one box 73 already filled. The filled boxes 73 can be transported via a transfer trolley to a weighing station 74 for weighing the tow, after which the boxes can be forked away by a fork lift. When the automatic silk box weighing device is specifically implemented, after the silk box is replaced, an operator marks the tail of the silk bundle in the silk box, then presses a weighing button to start the conveying device, an automatic system pushes the silk box to a weighing position to weigh the silk bundle, and then the PLC prints a label.

The yarn collecting unit avoids fiber overlapping by enabling the box, the chute and the pressing plate to move synchronously, and also avoids forming layered tows with different quantities from the central part at the two ends. The tows are laid in the box in a flat and smooth surface state, and the tows cannot be scattered, so that the 150K tows can be safely and stably laid in the box.

In specific implementation, the large-tow carbon fiber precursor filament collecting device provided by the invention can be arranged on two floors in two layers. The tows produced in the upstream process are cooled by the atomizing unit, the tension of the tows is maintained by the traction unit, the tows are bundled by the tow guide unit, and then the tows are mixed and wound by the crosslinking unit to form the lightly crosslinked 150K tows, and the lightly crosslinked 150K tows fall into the next layer of filament collecting box by the dead weight of the tows. The main part of the upper floor is a cross-linking function, 1 strand of 150K is woven by every 3 strands of 50K tows on a production line, and the main part of the lower floor is a filament collecting function, and 150K tows are safely and stably laid in a filament box.

The invention can realize the following effects:

the number of crosslinking points can be controlled by the length of the tow.

The fibers did not curl.

The tows in the box are not twisted and the adjacent tows are not overlapped.

The invention provides a large-tow carbon fiber precursor filament collecting device, which solves the problem that the existing filament collecting device is insufficient in filament collecting length of large tow precursors of more than 50K, so that the next procedure is frequently used for making joints; reducing tow friction points and untwisted take-up. According to the invention, every 3 bundles of 50K tows on an upstream production line are woven into 1 'pseudo' 150K large tow, the width of the tows is kept, no twist is generated, the tows are safely and stably laid in the filament box, the automatic boxing and collection of the large tow protofilaments are completed, and the production and operation of a subsequent carbonization process are facilitated.

While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, those skilled in the art will appreciate that various modifications can be made to the present invention without departing from the scope and spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.

Claims

1. The utility model provides a big silk bundle carbon fiber precursor receipts silk device which characterized in that includes in proper order according to the advancing direction of silk bundle:

the atomizing unit is used for spraying water mist to the tows;

a drawing unit for drawing the tow out of the atomizing unit;

the tow cross-linking unit is used for mixing and winding at least two tows into a 'pseudo' tow;

2. The large-tow carbon fiber precursor filament winding device according to claim 1, wherein the atomizing unit comprises a body, two opposite side walls of the body are respectively provided with a filament inlet groove for an upstream tow to enter and a filament outlet groove for a downstream tow, and an inner cavity of the body is provided with a water mist spraying pipeline.

3. The large-tow carbon fiber precursor take-up device according to claim 2, wherein two water mist spraying pipes are arranged on the upper side and the lower side of the filament inlet groove respectively.

4. The large-tow carbon fiber precursor filament collecting device as claimed in claim 1, wherein the drawing unit is composed of a rubber roller and four metal rollers arranged from top to bottom, and the first metal roller and the rubber roller are combined to work together with an extrusion pair roller.

5. The large-tow carbon fiber precursor filament winding device according to claim 1, wherein the tow guide and bundling unit comprises a base capable of moving in multiple directions and a ceramic arc-shaped bending roller rotatably connected to the base.

6. The large-tow carbon fiber precursor filament take-up device according to claim 1, wherein the tow cross-linking unit comprises, in order according to the advancing direction of the tow: mixing head cluster roller, mixing head, cross-linking head cluster roller and cross-linking head.

7. The large-tow carbon fiber precursor filament winding device according to claim 6, wherein the tow crosslinking unit further comprises a humidifying water roller and a pair of drop rollers, the humidifying water roller is arranged in front of the crosslinking head, and the pair of drop rollers is arranged in front of the humidifying water roller.

8. The large-tow carbon fiber precursor take-up device according to claim 7, wherein the humidifying water roller comprises a tray containing desalted water and a metal roller at least partially immersed in the tray.

9. The large-tow carbon fiber precursor take-up device according to claim 1, wherein the take-up unit comprises:

the wire box can move back and forth on the wire collecting track;

10. The large tow carbon fiber precursor take-up device according to claim 9, wherein the take-up unit further comprises a pressing assembly including a pressing plate for extending into the filament box to be exhausted, the pressing plate being movable together with the filament box.