JPS59106520A - Furnace for making yarn flame resistant - Google Patents

Abstract

PURPOSE:To heat-treating furnace for easy yarn guide having a structure wherein a furnace for heat treatment is set between a large number of rollers arranged in two lines of the top and bottom, chain wheels are equipped at both the end parts of rollers, a pair of chains are hung on the wheels in a zigazg way, and a yarn guide bar is suspended between the chains. CONSTITUTION:A large number of the rollers 5 and 6 are arranged in two lines of the top and bottom in a zigzag way, and the furnace body 1 for making yarn flame retardant is set between the lines of the rollers. The chain whees 6L and 6R are equipped at both the end parts of the rollers, a pair of chains 19L and 19R and hung on the chain wheels at both end parts in a zigzag way. The yarn guide bar 28 is suspended between a pair of the chains, a large number of the end parts of the yarn 2 are attached to it, and guided in a zigzag way through the rollers 5 and 6. A chain wheel in the outer range of the furnace body 1 is provided with the rotating drive means, and the chain dancer means 23 are set between the chain wheels 22 and 24.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides flameproofing treatment (sometimes referred to as oxidation treatment) of raw fibers when producing carbon fibers from organic polymer II fibers (particularly preferably acrylic fibers). This invention relates to a flame-proofing furnace for yarn for producing the flame-resistant yarn, in which the flame-resistant yarn is made into a flame-resistant yarn, which is then carbonized to make carbon fiber.

Generally, carbon fibers are manufactured by heat-treating acrylic fibers, pitch fibers, polyvinyl alcohol fibers, etc. under temperature and atmospheric conditions suitable for each fiber. For example, first, acrylic I&Ii fibers are exposed to an oxidizing gas (e.g., air).
The fibers are heated and fired at 200 to 280°C to produce so-called flame-resistant fibers. Next, this flame-retardant fiber is heated using an inert gas (
For example, carbon fibers can be obtained by heat treatment at 800 to 2800° C. in nitrogen gas). It is known in Japanese Patent Publication No. 51-27778 and Japanese Unexamined Patent Application Publication No. 52/1988 that this first-stage flameproofing step can be carried out using a flameproofing furnace having a multistage roller group.
It is known from the publication No.-74026. This multi-stage roller system can form a relatively long yarn treatment area in a relatively small furnace, so it has been used for the first time as a flameproofing treatment furnace for acrylic fiber yarns that require a relatively long treatment time. There is.

However, threading to this multi-roller type flameproofing furnace is difficult.
This is done by winding the yarn around a large number of rollers, but conventionally this was done by hand in a flameproofing furnace at room temperature, which required extremely complicated work that continued for a long time. Furthermore, there are inherent factors that seriously impede production efficiency, such as the fact that it takes a long time to raise the temperature of the atmosphere in the furnace until normal operation is achieved.

However, in contrast to this, a means was proposed in Japanese Patent Publication No. 1811/1983 that allows threading even at a firing temperature of about 180 DEG C. without lowering the furnace atmosphere temperature to room temperature. This involves installing a pair of endless chains on both sides of the yarn transfer roller, passing a yarn tying bar between the pair of chains, and tying the yarn to this yarn tying bar. This serves as a thread hook for the transfer roller.

However, this Cheno threading method is relatively easy to implement when the number of yarn transfer rollers is small, or when the number of yarn transfer rollers is 15 or more, or even 20 or more. In the case of furnaces, the endless chain repeats many meandering bends in the four sections, resulting in extremely large resistance to movement of the chino, which necessitates the use of a chino with a considerably thick structure. It has been found that the use of a die with a thick structure causes the following serious problems for flame-retardant furnaces.

In other words, the endless chains installed in a meandering manner along both sides of the yarn transfer port C1 are installed in the C1 furnace body between the yarn transfer rollers provided on the outside of the furnace body. It is introduced into the furnace body through the slit section, and after passing through the furnace body, it is led out of the furnace body through the slit section provided in the furnace body. However, as the chino structure becomes thicker, the slit width of the slit section must be increased. If the width of the slit is widened, a large amount of the heated atmospheric gas inside the flameproofing furnace will leak out of the furnace. In addition to causing a significant decrease in thermal efficiency, the gas generated by the decomposition of the yarn during firing and the decomposition of the oil adhering to the yarn may cause the gas generated to leak out of the furnace body. A problem unique to the production of flame-resistant yarns occurred in that the beating was significantly increased and the working environment was significantly deteriorated.

The present invention was made for the purpose of solving the problems of the prior art, and its structure is as follows.

(a) A first roller row consisting of a plurality of rotating rollers for transporting the raw yarn for flame-resistant yarn, and a second roller row consisting of a plurality of rotating rollers arranged at intervals with respect to the second roller row. a second roller row; (b) a heating treatment area provided surrounding a yarn that meanders and moves sequentially through the rollers of the second roller row and the second roller row, and for making the yarn flame-resistant; (c) a roller driving means for actively rotating a roller provided at one end of the roller at °C as necessary; (d) a rotatable roller at both ends of each of the rollers; A pair of endless chains installed in a meandering manner in the chain; a pair of endless chains installed in the chain; a pair of endless chains installed in the chain;
(g) A first chain for moving the chain installed on the outer slope of the section from the exit of zone 9 of the endless chain to the entrance of zone 9 in the direction of movement of the chain; (h) a means for a chenodancer provided on the outer sloped path; a second chain drive means engaged with at least one chain wheel and for actively rotating the chain wheel.

Next, the present invention will be explained using one embodiment with reference to the drawings.
I will explain further.

FIG. 1 is a schematic side cross-sectional view of an apparatus for implementing the present invention, and FIG. 2 is a partial cross-sectional view taken along line A--A of the apparatus shown in FIG. In these figures, the flame-retardant furnace 1 is a rectangular parallelepiped-shaped furnace that has a width that corresponds to the number of yarns 2 that are flame-retardant Itokawa fibers to be treated, and a length that corresponds to the treatment temperature, time, and speed. The flameproofing furnace 1 is provided with a gas supply duct 3 for supplying heated gas (usually air) and a gas discharge duct 4 for discharging the gas from which the yarn 2 has been treated. There is.

The gas supply duct 3 communicates with the inside of the furnace 1 at the lower part of the furnace 1 through a number of openings 3' provided in the side wall of the furnace 1, and the gas exhaust duct 4 communicates with the inside of the furnace 1 at the upper part of the furnace 1. The interior of the CC furnace is communicated through a number of openings 4' provided in the side wall.If the width of the furnace 1 is large, a duct is extended into the furnace 1 from the openings 3' and 4', and the upper surface of the duct is It is preferable to supply and discharge gas from a large number of ventilation holes drilled in the J-shaft and the lower surface, respectively, and to uniformly supply and discharge gas to the furnace 1 in the width direction of the furnace. A plurality of rotating rollers 5 (1
) to 5(n) is arranged, and the furnace 1
A plurality of rotating rollers 6 (1) to 6 (
A second roller row consisting of n −1> is provided.

The structure of each of these rollers will be explained using the roller 6(2) shown in FIG. 2 as an example. The roller 6 (2) has bearings 7R17 attached to the furnace body of the furnace 1 at both ends thereof.
The L&trowel is rotatably supported, and a roller drive motor 8 is attached to one end of the roller 6 (2).
is fixedly installed in the furnace body of the furnace 1. A thread groove 9 around which the thread 2 is wound is carved in the center of the roller 6 (2). Preferably, the yarn grooves 9 are of a type in which a plurality of groups of a certain number and a constant pitch of grooves are arranged with an annular protrusion 10 interposed therebetween. This has the effect of not damaging the thread groove 9 when it comes into contact with the roller 6 (2) and rotates. In addition, roller 5 (1)
・Among ~5(n) and 6(1) to 6(n-1), it is not necessarily necessary to actively drive the rotation,
The drive motor 8 can be omitted if it is sufficient to follow the movement of the wound yarn 2.

A3 in the furnace 1, the yarn 2 passes through the roller 5(1) to the furnace 1.
Inlet 1 consisting of slit 30 (1) provided on the lower surface of
1 into the furnace 1, each roller 6 (1), 5 (2)
, 6(2), 5(3), ...... 6(n-1), the thread is threaded in a meandering manner, and the outlet consists of a slit 30 (2n-1>) provided on the lower surface of the furnace 1. 12 to the outside of Class 1, and is threaded through the roller 5(n) to the next process. ) ~ 30 (2n -2),
31. Pass through (1) to 31 (2n-1). Both ends of each roller 5(1) to 5(n), 6(1) to 6(n-1) are provided with Cheno foils 5(1)R, 5(1)L, 6(1)R.
,6(1)L,...6(n-1)R16(n-
1) L, 5(n)R15(n)L are rollers 5(1) to
5(n), 6(1) to 6(n-1), it is rotatably arranged. This state is shown in FIG. 2, taking D-Ra 6(2) as an example. Chenovoile 6 (2) R is attached to roller 6 (2) via bearing 13R,
The chain wheel 6 (2) L is mounted on the roller 6 (2) via a bearing 13m. On the other hand, as a synchronization mechanism for synchronizing the rotation of both Chenovoils 6(2)R and 6(21L), a large gear 15R is attached to the roller 6(2) via a bearing 14R114.
115L, and a bearing 1 that engages with the large gears 15R and 15m and rotatably supports the small gears 17R and 117L, J3 and the tuning shaft 16 fixed to the tuning shaft 16 at both ends thereof.
8R, 18L are provided, chain wheel 6 (2)R
and large gear 15R are integrated with a fixed pin (not shown),
In addition, by integrating the Cheno Wheel 6 (2) L and the large gear 15L with a fixed pin (not shown), the Cheno Wheel 6 (2JR Toro (21L) and the Toha small S wheel 17R
, 17L are tuned via the Oyohi tuning shaft 16.

Note that this tuning iWJ is not necessary between the left and right chess boilers of the ° rib, but may be provided between the left and right chess boils. Jin1 wheel on the right side 5(1)R, 6(1)R15(2JR,・
----6 (n = 1) R, 5 (n), the endless right chain 19R is meanderingly engaged with C, and the left chain wheel 511) L, 6 (+) L.

5 (2) L,...-6(n -1) L, 5(
n) An endless left chain 191 is engaged with L in a meandering manner. Right chain 19R1 and left chain 1
9L further contains Chenovoil 5(n)R.

5 (n) L to Chenofoil 5 (1) R, 5 (1
) A communication shaft 20.21.22.23.24 rotatably supported by a bearing (not shown) in the 9 external path leading to L.
．． 25. Dien foil 2OR fixed on both ends of 26.
...26R1 and 2OL...26L are connected to form left and right endless chain rows. A motor 27, which is a first driving means for rotating the communication shaft 21, is installed at one end of the communication shaft 21.
is supported by a chenodancer mechanism (not shown) that moves up and down in order to adjust the expansion and contraction when the die row expands and contracts mainly depending on the temperature of the furnace 1.

Also Chenofoil 5(1)R, 5(1)L, 6(1)
R, 6 (1) ci, ... - 6 (n -1) R16 (
n-1) L.

Some pairs of left and right Cheno boilers of 5(n)R, 5(n)L are driven by motors 32(1) to 32(m>, which are second Cheno drive means) to the inlet 1 of the furnace 1.
In order to actively drive the left and right chain rows 19R119L located in the inner sloped road between exit 1 and exit 12,
Forced to rotate actively. The details of this structure will be briefly explained using FIG. 3, taking the case of Chenofoil 5 (3) R15 (3) L as an example. FIG. 3 is a view taken along arrow B-[3 in FIG. 1. Chenofoil 5 (3) R
is attached to the roller 5(3) via a bearing 13R, and the Cheno wheel 5(3)L is attached to the roller 5(3) via a bearing 13L. On the other hand, in order to actively rotate both Chenovoils 5[3]R and 5(31L), a bearing 14R,
Large gear 15°R115L attached via 14L
and small gears 17R, 17L that engage with the large gear 15R115m and are fixed to the rotation transmission shaft 33, and the rotation transmission shaft 3.
Bearing 18R1 rotatably supports 3 at both ends thereof.
18L is provided, and the Cheno wheel 5 (3) R and the large gear 15R are integrated with a fixed bin (not shown), and the Cheno wheel 5 (3) L and the large gear 15L are integrated with a fixed bin (not shown). r, and a Cheno wheel 34 is fixed approximately in the center of the rotation transmission shaft 33,
An endless chain wheel 35 is wound around the chain wheel 34, and the endless chain wheel 35 is connected to a chain wheel 36 on the other side.
The chain wheel 36 has a structure fixed to the drive shaft 37 of the second engine drive motor 32(1).
There's a lot of yelling.

Additionally, in the structure shown in FIG. 3, the synchronization shaft 16 shown in FIG. The structure is exactly the same as when the drive shaft 37 and the second chino drive motor 32(1) are attached.

The left and right die rows 19R and 19m have a large number of slits 30(1) to 30(2) provided on the lower and upper surfaces of the furnace 1.
n −1>, enters Class 1 through 31(1) to 31(2n-1), and exits from Class 1.

Moreover, at least one thread attachment bar 28 is spanned between the left and right chain rows, and both ends of the bar 28 are detachably attached to the left and right chain rows 19R119L. The thread attachment bar 28 has rollers 5 (1) to 5 (
n), 6(1) to 6(n-1) are provided with thread attachment holes 29 protruding corresponding to the holes of the thread hooking grooves 9.
The tip of the yarn is fixed to the bar 28 through this hole 29.

Next, the operation of threading the furnace 1 using the apparatus having the structure described above will be explained.

The tips of the predetermined number of yarns 2 to be fired are connected to the predetermined yarn attachment holes 2.
The thread attachment bar 28 passed through and fixed to the thread attachment bar 28 extends over the stationary left and right chain rows 19R, 19L and is fixed at a position slightly past the chain wheels 26R, 26L.

After the fixation is completed, the switches of the first chain drive motor 27 and the second chain drive motor 32 (11 to 32 (m>) are turned on, and the left and right chain rows 19R and 19L rotate endlessly at the same speed. As the chain moves, the thread attachment bar 28 takes the thread 2 and attaches it to the chain wheel 5.
(1)R, 51)L.

Chenofoil 6(1)R, 6[1)L, Chenofoil 5
(2JR, 5(2)L, ---・Che > foil 6
(n -1)R,6(n-1)L,chenofoil5(n
)R.

5(n)L, and the thread attachment bar 28 connects each roller 5(1), 6(1), 5(zl...6(n)
-1), 5(n), each time the yarn attachment bar 2 is wound.
The yarn that is being moved by the rollers 8 is moved by each roller 5 (1
), 6(1), 5(al...6(n-1), 5
The thread is wound into a predetermined thread thread groove 9 provided in (n). At this time, each [''-ra 5 (1), 6 (1), 5 (2)
,...6 (n-1) and 5 (n) are rotated at a predetermined yarn feeding speed, and between each roller,
In addition, the rotational speed of each roller and the moving speed of the yarn attachment bar 28 are adjusted so that abnormal slack or abnormal tension does not occur in the yarn between the rollers and the yarn attachment bar 28. FIG. 4 is a view taken along the line C-C in FIG. 2, and taking the roller 6 (2) as an example, the thread attachment bar 28 is attached to the protrusion 10 of the roller 6 (21). This shows a state in which the yarn 2 is wound while being in contact with each other, and the yarn 2 is gradually wound into the yarn groove 9 as the yarn 2 is wound.

Thread attachment bar 2 up to the front of Cheno foil 2OR12OL
8 has been derived, chain rows 19R, 19L
The rotation of the thread attachment bar 28 is removed from the left and right chain rows 19R1''191, and the next process is started.The furnace 1, which has been threaded, is moved to a predetermined position if necessary. and, if necessary, each roller 5(1), 6(1), 5(1), 5
The rotational speeds of (2, . . . 6(n-1), 5(n) are increased to their respective predetermined values, and the normal flameproofing process is started.

In addition, when stopping the chain trains 19R and 19L, the first chain drive motor 27 is stopped, then the second chain drive motor 32 (m>) is stopped, and the chain is sequentially moved from the downstream side to the upstream side. By stopping the second chain drive motor, all of the chain wheels 5(1)...5(n) provided on the bottom side of the furnace 1, or the vicinity of some of these In this way, when the temperature of the flameproofing furnace 1 is suddenly lowered due to an accident or the like, it is possible to prevent the destruction of the chino and the destruction of the chino foil due to contraction of the chino. Check the state of Cheno sag using Cheno foil 5 (3) R, 5
(3) L is shown in FIG. 5 as an example. FIG. 5 is a view taken along the line DD in FIG. 3. In FIG. 5, after the movement of the chain rows 19R and 119L is stopped, a chain slack 38 is formed near the chain boiler 5 (3) R15 (3) L. If this slack 38 is large, the chain chains 19R and 19L are Chenofoil 5(3)R,5(3
) Since there is a possibility that the 111 may come off from the Cheno foil, the detachment prevention guide 39 should be provided with enough space on part or all of the lower half of the Cheno foil 5 (3) R15 (3) L to guide the Cheno along the Cheno foil. It is set aside.

As explained above, the yarn flameproofing furnace according to the present invention
Since the chain row for threading is driven by a chain drive motor installed in the 4th area outer path and a chain drive motor installed in the 4th area inner path, a thinner chain is used for threading. This makes it possible to minimize the width of the numerous slits that are provided to allow chain rows to enter and exit the flame-retardant furnace body multiple times for threading, and to meet extremely strict flame-retardant requirements. It has the effect of preventing fluctuations in the temperature inside the furnace and energy loss, and has the effect of producing uniform flame-resistant yarn with less energy, as well as reducing the dissipation of gas generated in the furnace into the working environment. Qin has the effect of being able to do very little.

[Brief explanation of the drawing]

FIG. 1 is a schematic side cross-sectional view of one embodiment of the flameproofing furnace for yarn according to the present invention, FIG. 2 is a partial cross-sectional view taken along the line A-A shown in FIG. 1, and FIG. , B-B arrow view shown in Fig. 1, No. 4
The figure is a cross-sectional view taken along the line CC shown in FIG. 2, and FIG. 5 is a cross-sectional view taken along the line D-D shown in FIG. 3. 1: Flameproofing furnace 2: Yarn 3: Gas supply duct 4: Gas discharge duct 5: First roller row 6: Second roller row 7: Bearing 8: Roller drive motor 9: Yarn groove 10: Annular Projection 11: Inlet 12: Outlet 5mR...5(n)R: Right side chenofoil 5m
L...5(n)L: Left side Cheno foil 6 fl
) R...6 (n-1) R: Right side chenohoil 6 (1) L...6(n-1) L: Left side chenohoil 13: Bearing 14: Bearing Bearing 15: Large Gear 16 2 Tuning shaft 17: Small gear 18: @Receiver 19R: Right end 19L: Left end 20...26: Communication shaft 2OR...26R: Cheno wheel 2OL...
......26L: Cheno wheel 2F: First engine drive motor 28: Yarn take-up eq bar 29: Yarn attachment hole 30 Nis slit 31 Nis slit 32 (1) --- 32 (+n ): Second chain drive motor 33: Rotation transmission shaft 34: Chain boil 35: Chain 36: Chain boil 37: Drive shaft 38: Chain sag 39: Release 1] 52 Prevention guide Patent applicant Toshi Co., Ltd. No. 4 Zutomi 5 Figure 116-

Claims (1)

[Scope of Claims] (a) A first roller row consisting of a plurality of rotating rollers for transporting the flame-resistant Itokawa yarn, and a plurality of similarly arranged roller rows arranged at intervals with respect to the second roller row. A second roller row consisting of rotating rollers (mortar) is provided surrounding the yarn that moves in a meandering manner sequentially through the rollers of the first roller row and the second roller row, and is used to make the yarn flame resistant. (c) a roller drive means provided at one end of the roller as necessary for actively rotating the roller; (b) A pair of endless chains arranged in a meandering manner in sequence on the chain foil; (f) A thread attachment thread passed between the pair of chains and attached at both ends to the chain. (g) a first chino drive means for moving the chino provided in the furnace area outside path in the section from the furnace area exit of the endless chino to the area 4 entrance in the direction of movement of chi 1; (g) A means for a chenodancer installed in the outer path of the furnace zone; and a second chain drive means for actively rotating the chain boiler.