JPH0680212B2 - Precursor fiber heat treatment equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for heat-treating a precursor fiber obtained by spinning. In particular, like pitch-based carbon fiber precursor,
A device for receiving fibers that have very low strength immediately after spinning, are prone to yarn breakage and fuzzing, on a conveyor that moves in a heat treatment furnace, and leave the heat treatment furnace in that state, and then receive the loaded fibers from the conveyor .

[Conventional technology]

The following methods have been proposed for continuous heat treatment of the brittle precursor long fibers immediately after spinning as described above.
That is, according to Japanese Patent Laid-Open No. 62-90306, the precursor fiber obtained by spinning is immediately loaded on a conveyor attached to a heat treatment furnace continuously in a substantially rectangular wave shape, and a predetermined heat treatment is performed in that state. After leaving the furnace, the heat-treated fibers on the conveyor are continuously and unrolled by a Nelson roller or the like and drawn out, and wound by a winder.

In general, the wound yarn is supplied to a graphitizing furnace by carbonizing and unwinding it in the subsequent carbonizing and graphitizing steps.

[Problems to be Solved by the Invention]

In Japanese Patent Laid-Open No. 62-90306, there is a problem that the loading amount per unit area is small and the heat treatment efficiency is low because the loading is continuously performed in a substantially rectangular wave shape on the conveyor. Further, at the exit of the furnace, the fibers on the conveyor after the heat treatment are unwound, but the unwinding speed must be about the same as the spinning speed. Several 100m / min
In many cases, the yarn is damaged at the time of unwinding, and production damage due to yarn breakage and yarn damage such as fluffing are likely to occur. Further, since the precursor fiber is fragile, a sufficient winding tension cannot be applied, and therefore when wound on a bobbin, it cannot be wound thick and the lot cannot be increased.

An object of the present invention is to provide a precursor fiber heat treatment apparatus capable of dramatically improving the production efficiency as compared with the conventional method.

[Means for Solving the Problems]

The structure of the present invention for achieving the above object is as follows.

(1) Above the conveyor in front of the furnace entrance of the conveyor that moves in the heat treatment furnace, a take-up and supply device is provided, which simultaneously draws fibers while two-dimensionally swinging in the conveyor advancing direction and the width direction and supplies the fibers onto the conveyor. Heat treatment of the precursor fiber, characterized in that a rotary table equipped with a receiver is provided below the end of the conveyor behind the outlet, and the heat-treated precursor fiber is transferred from the conveyor to the receiver and received. apparatus.

(2) A take-up / feeding device is provided above the conveyor in front of the furnace inlet of the conveyor that moves in the heat treatment furnace while simultaneously two-dimensionally swinging in the conveyor advancing direction and the width direction, to take up the fibers and feed them onto the conveyor. A transfer conveyor for transferring heat-treated precursor fibers is installed at the rear conveyor end, and a rotary table equipped with a receiver is installed below the end of this transfer conveyor to receive heat-treated precursor fibers from the transfer conveyor. A precursor fiber heat treatment apparatus, characterized in that it is transferred to a vessel and received.

(3) The precursor fiber heat treatment apparatus according to the above (1) or (2), wherein the rotary table is configured to be vertically movable.

(4) The heat treatment apparatus for a precursor fiber according to the above (1), (2) or (3), wherein the fiber supplied by the take-off supply device onto the conveyor is a precursor fiber immediately after spinning.

〔Example〕

Next, the present invention will be described by way of examples with reference to the drawings.

FIG. 1 is an embodiment of the fiber take-up and supply device according to the present invention.

The precursor fiber 2 continuously spun from the spinning nozzle 1 is
The fiber is taken up by the take-up roll 3 and guided to the fiber take-up and supply device 5 of the present invention. The fiber 2 is wound around a guide roll 14 that simultaneously two-dimensionally swings in the conveyor traveling direction (hereinafter referred to as Y direction) and the conveyor width direction (hereinafter referred to as X direction) and positively rotates, and then integrated with the guide roll 14. Then, the fiber is guided to the fiber take-up device 15 that two-dimensionally swings in the X direction and the Y direction at the same time, and is loaded on the conveyor 7 moving in the heat treatment furnace 6 while being traversed simultaneously in the X and Y directions.

The fibers 2 are loaded on the conveyor 7 in front of the furnace inlet and then continuously introduced into the heat treatment furnace 6 together with the conveyor.

The guide roll 14 and the fiber take-up device 15 draw a locus as indicated by 33 by an X, Y two-dimensional swing mechanism described later.

Next, the two-dimensional swing mechanism and the turning mechanism of the guide roll 14 will be described.

The entire fiber take-up supply device 5 includes a mechanism for simultaneously two-dimensionally swinging the guide roll 14 and the fiber take-up device 15 in the X and Y directions and a mechanism for turning the guide roll 14. That is, the table 11 is placed on the Y-axis rail 10 installed on the pedestal 9, and the table 11 is connected via the joint 27 to the eccentric cam 26.
The motor 22 reciprocates in the Y direction via the belt 23 and the shaft 19.

The table 13 installed on the X-axis rail 12 installed on the table 11 is equipped with a guide roll 14 and a fiber take-up device 15, and one end of the table 13 has a sliding jig in a cam groove 32 cut in a cam shaft 31 ( (Not shown). Camshaft 31
Is rotated in one direction by a motor 28 via a belt 29, and the table 13 reciprocates in the X direction in a region where the cam groove 32 is provided.

The table 13 and the table 11 reciprocate independently and simultaneously, and the guide roll 14 and the fiber take-up device 15 mounted on any of these tables draw a locus as indicated by 33.

Further, the guide roll 14 is rotated in the direction of the arrow by the motor 16 mounted on the table 11 via the belt 20 and the pulleys 17, 18, 21, 24.

The entire guide roll rotating mechanism reciprocates integrally with the guide roll 14 in the Y direction, so that the belt 20
It is possible to drive without bending and without pulling out from the pulleys 17, 18, 21, 24.

The traverse distance in the X direction is determined by the installation length of the cam groove 32. Y
The directional traverse distance is determined by the stroke of the eccentric cam 26, and its stroll is set to be larger than the crossing drop difference of the fibers 2 generated in the rotary table collecting device portion of the present invention described later.

The fiber take-up device 15 can prevent the fibers from being wrapped around the guide roll 14 such as an air sucker, and can be conveyed by the conveyor 7
Any material may be used as long as it has a function of supplying the fibers 2 on top. As the conveyor 7, a metal net conveyor having air permeability is used.

The take-off supply device of the present invention is configured so that simultaneous traverse can be performed in the Y direction in addition to the X direction traverse. Therefore, for example, the spinning speed is 300 m / min and the traverse speed is 5 m / min in the X direction. , 60 m / min in the Y direction, the traverse distance in the X direction is almost the same as the conveyor width, and the Y direction is a distance larger than the connecting drop difference generated in the rotary table collecting device section described later, which is 10 to 60 cm, and the conveyor speed is 0.1 m / min. m
If it is set to in, fibers are deposited with a three-dimensional spread as shown in FIG. 2 (a), so that newly loaded fibers are piled on the slopes already formed and one end is also on the conveyor surface. No need to collapse even after landing and high loading
It is possible to carry out stable loading as shown in FIG. Therefore, the heat treatment efficiency can be dramatically improved as compared with the conventional method.

Next, one embodiment of the apparatus for receiving heat-treated fibers on the conveyor of the present invention is shown in FIG.

At the end of the conveyor 7 behind the outlet of the heat treatment furnace 6, a transfer conveyor 36 for transferring the heat-treated fibers 2 on the conveyor 7 is provided, and the fiber 2 transferred to the transfer conveyor 36 is provided below the end of the transfer conveyor 36. Receiver 39
A rotary table 38 equipped with is installed. The transfer conveyor 36 is rotated in the same direction by the motor 37 at substantially the same speed as the conveyor 7. The transfer conveyor 36 may be omitted, and a rotary table 38 having the receiver 36 may be provided below the end of the conveyor 7.

FIG. 4 shows a detailed implementation example of the rotary table 38. The rotary table 38 equipped with a receiver 39 is a motor 4
0, rotated in the same direction as the conveyor 7 by the reducer 41,
It is equipped with a fluid cylinder 42 that detects the position of each rotation and lowers the position by a predetermined distance. The Y-direction traverse distance of the take-up and supply device 5 is set so as to be larger than the connecting drop difference of the fibers 2 generated in the rotary table collecting device portion, and the take-up and supply is performed. Since the fibers 2 on the conveyor which have been heat-treated are descended along the end rolls 35 and separated from the conveyor surface at their vertical line portions, the transfer conveyor 36
It can be landed on the top and can be transferred without turning the fiber layer upside down and entanglement. Transfer from the transfer conveyor 36 to the rotating receiver 39 is performed in the same manner.

In this way, the fibers 2 on the conveyor 7 can be continuously transferred to the receiver 39 as described above.
The fibers 2 on the 39 are received in a donut shape with a width substantially the same as the loading width on the conveyor. The rotary table 38 detects the rotational position of each rotation by a detector (not shown) and the fiber 1
The fluid can be lowered by the fluid cylinder 42 by a distance corresponding to the layer height, and the fibers of the first layer can be successively and continuously collected.
Generally, the surface of the nozzle 1 is cleaned almost regularly during the spinning in the upper step, and at this time, the supply of the fiber 2 to the conveyor 7 is stopped for a short time, so that the tail of the conveyor-loaded yarn naturally appears. Therefore, it is desirable to determine the size of the receiver 39 so that the amount of spinning can be received as a unit every 1 to 10 hours which is this cycle. The collected fibers move to the next step of each receiver, and after arranging a plurality of receivers filled with fibers, the fibers are moved at a relatively low speed of 0.5 to 10 m / min from the tail end of each uppermost layer. While unwinding, supply into the heat treatment furnace for carbonization, graphitization, etc.

In this way, the collecting device using the rotary table after the heat treatment furnace 6 can omit high-speed unwinding and winding of the heat-treated fragile precursor fibers on the conveyor, so that production failure due to yarn breakage, fluffing, etc. Can prevent fiber damage. Further, since the fibers on the conveyor 7 can be continuously collected by stacking one or more layers in a donut shape on the receiver 39 loaded on the rotary table, as compared with the conventional unwinding and winding method. It is possible to make a dramatically large lot and supply it to the carbonization, graphitization furnace, etc. in the next step.

In this example, the heat treatment process from spinning to a continuous process was described.After spinning, the fibers collected in the can or the fibers wound up by spinning were loaded on a conveyor and unheated. It is effective in any case.

〔The invention's effect〕

As described above, in the step of receiving the heat-treated fibers on the conveyor at the furnace exit conveyor end after heat-treating the fibers loaded on the conveyor moving in the heat treatment furnace in that state, the fiber take-off supply of the present invention The receiving device using the device and the rotary table has the effect of dramatically improving the production efficiency and producing high quality fibers.

[Brief description of drawings]

FIG. 1 is a bird's eye view showing an embodiment of the fiber take-up and supply apparatus of the present invention. FIG. 2 is a diagram showing a characteristic two-dimensional traverse loading shape of the present invention when fibers are loaded by the apparatus of FIG. FIG. 3 is a view showing a fiber connecting state until heat-treated fibers on a conveyor are received by a receiver. FIG. 4 is a diagram showing a rotary table equipped with the receiver of the present invention. 1 ... Spinning nozzle, 2 ... Fiber, 3 ... Take-up roll, 4,16,22,28,37,40 ... Motor, 5 ... Take-up supply device, 6 ... Furnace, 7 ... Conveyor, 8 ... Support, 9 ... Stand, 10 ... Y-axis rail, 11, 13 ... Table, 12 ... X-axis rail, 14 ... Guide roll, 14 ... Fiber take-up device, 17, 18, 21, 25,24,30 …… Pulley, 19 …… Shaft, 20,23,29 …… Belt, 26 …… Eccentric cam, 27 …… Coupling, 31 …… Cam shaft, 32 …… Cam groove, 33 …… Fiber take-up device locus, 34 …… Fiber loading shape, 35 …… Conveyor end roll, 36 …… Transfer conveyor, 38 …… Rotary table, 39 …… Receiver, 41 …… Reducer, 42 …… Fluid cylinder.

Claims (4)

[Claims] 1. A take-up and feeding device is provided above a conveyor in front of a furnace entrance of a conveyor that moves in a heat treatment furnace, and takes up fibers while simultaneously two-dimensionally swinging in a conveyor traveling direction and a width direction and supplies the fibers onto the conveyor. , A precursor table characterized in that a rotary table equipped with a receiver is provided below the end of the conveyor behind the furnace outlet so that the heat-treated precursor fiber is transferred from the conveyor to the receiver and received. Heat treatment equipment. 2. A take-up and feeding device is provided above the conveyor in front of the furnace entrance of the conveyor that moves in the heat treatment furnace, and takes up the fibers while simultaneously two-dimensionally swinging in the conveyor advancing direction and the width direction, and feeds the fibers onto the conveyor. A transfer conveyor for transferring heat-treated precursor fibers is provided at the end of the conveyor behind the furnace outlet, and a rotary table equipped with a receiver is provided below the end of the transfer conveyor to provide a transfer conveyor for heat-treated precursor fibers. A heat treatment device for precursor fibers, characterized in that the heat is transferred from the receiver to a receiver and received. 3. The precursor fiber heat treatment apparatus according to claim 1, wherein the rotary table is configured to be movable up and down. 4. The heat treatment apparatus for a precursor fiber according to claim 1, 2 or 3, wherein the fiber supplied by the take-off supply device onto the conveyor is a precursor fiber immediately after spinning.