JPH0235825Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat treatment apparatus for synthetic fiber yarn. Conventionally, a heating roller is one of the heating devices for preheating or heat-treating yarn. Such a heating roller has an electric heater built into the rotating roller, or directly heats the roller to a high temperature by induction heating to heat the yarn running on the outer circumferential surface of the roller, so it is different from conventional contact plate heaters, etc. Unlike the conventional heater, it has many advantages such as no damage to the yarn due to frictional resistance on the outer circumferential surface of the heater and a long contact length considering the space available, and has been widely used in recent years. In particular, it is no exaggeration to say that it is an essential yarn heating means in the so-called direct spinning and drawing process in which spinning and drawing are directly connected.

However, on the other hand, it also has the disadvantage that heat dissipation from the surface of the roller, which rotates at high temperatures and high speeds, is extremely large compared to conventional fixed plate heaters. In particular, in direct spinning and drawing processes where the yarn running speed is 2000 m/min or more, heat dissipation from the roller surface is approximately 80 m/min, depending on the denier of the heated yarn.
% and the effective heat utilization for heating the yarn is extremely low. This does not only mean that electricity costs are relatively high in the production cost of yarn, but also that the indoor temperature rises due to the large amount of heat dissipated, and the amount of cold water increases as the temperature control load increases. etc., the impact on the overall utility is extremely large. In addition, yarns such as synthetic fiber yarns can be used.
It is well known that when the yarn is heated to about 150 to 230℃, the oil adhering to the yarn separates and becomes oil smoke. This will significantly worsen the working environment.

Therefore, in order to prevent heat dissipation from the roller surface, eliminate oil smoke, and maintain uniform roller surface temperature,
Although various heating devices have been proposed in the past, there is still no device that can be considered sufficient.

For example, as shown in FIGS. 1 and 2, if a pair of heating rollers 1 and 2 are covered with a box 3 in which yarn path slits 4 and 4' are formed, external influences can be prevented, and the temperature gradient on the roller surface can be prevented. This makes it possible to maintain a uniform heat treatment temperature for the yarn Y, and at the same time, by covering with the box 3, heat loss is reduced, which is very economically advantageous.

However, in such a conventional device, the heating rollers 1 and 2 and the side plates 3b and 3 of the box 3 are
Regardless of whether the space between c was widened or narrowed, major problems were caused.

That is, from the viewpoint of thread threading workability, in order to perform these operations as easily and safely as possible, the size of the box 3 should be made as wide as possible, and the distance between the heating rollers 1, 2 and the side plates 3b, 3c of the box should be made as large as possible. While it is preferable to widen the space between the two boxes, from the viewpoint of heating efficiency, it is preferable that the size of the box 3 be smaller, and in order to achieve these objectives, there are contradictory constraints. In particular, when the heating roller rotates at high speed, the air inside the box becomes a high-speed accompanying rotating airflow that spreads turbulently inside the box, and the high-temperature airflow near the roller surface is also instantly diffused.In other words, the roller surface is always The heater is cooled by fresh air (air located away from the rollers), which increases the power consumption of the heater.

In other words, among the factors that induce heat loss, such as heat transfer, radiation, and convection, convection loss has dramatically increased.

At this time, as shown in Japanese Patent Publication No. 53-23407, in order to prevent smoke-emitting substances such as oil smoke from dispersing indoors, if the box is provided with an exhaust port that communicates with forced exhaust means such as a decompression exhaust device, Particularly high-temperature air is quickly discharged outside the box through the exhaust pipe, and cold air from outside enters the box to replace this high-temperature air. For this reason, there was a major problem in that not only the temperature of the roller was not stable, but also the power consumption of the heater was significantly increased.

The present invention was devised in view of this problem, and includes a box surrounding the heating roller that heat-processes the yarn, and a box placed in the box close to the heating roller to prevent the diffusion of the accompanying flow. This is a yarn heat treatment apparatus characterized in that the box surrounds the cover of the box, and an exhaust port communicating with a forced exhaust means is provided in the box.

Hereinafter, the present invention will be explained based on the drawings. Third
The figure is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 4 is a sectional view taken along the line A--A in FIG. 3. In the figure, reference numerals 11 and 12 denote a pair of actively rotating heating rollers provided on a machine base (not shown), and a box 13 surrounding the pair of rollers 11, 12 is fixed to the machine base (not shown). This box 1
3 has hinges 1 at the front ends of the side plates 13a and 13b, respectively.
Front doors 15, 16 that can be opened and closed via 4, 14'
is attached and a fixing clasp (not shown) is provided. 17 and 18 are the upper plate 13
c, a slit for the thread guide provided in the lower plate 13d. 19 is a pair of heating rollers 1 in the box 13.
1 and 12 to prevent diffusion of the accompanying flow, the cover is formed into a hollow body with an oval cross section, and the front surface is sealed by the front plate 19a and the rear surface is an open surface. 20, 20' is cover 19
It is a tubular suspension body that supports the box 13 and is inserted into shafts 21, 21' fixed to the box 13 so as to be freely removable. A magnetic plate is provided on the rear plate 13e of the box 13 located at the rear end attachment portion of the shafts 21, 21'.
Although the cover 19 is fixed by magnetic force when it is pushed in along 21', the fixation of the cover 19 is not limited to the above example and may be done by any other means. The cover 19 may also have a rectangular or polyhedral cross section. Furthermore, 22,
22' is a slit for the thread guide.

Reference numeral 30 denotes an exhaust port provided at the upper center of the rear plate 13e of the box 13, and the exhaust port 30 is connected to the exhaust pipe 31.
It is connected to a forced exhaust means such as a fan or blower via a. Normally the exhaust port 30 is box 1
Although it is preferable to provide it at the center of the rear part of 3, it is not limited to this position.

In such a device, heating rollers 11,1
2, open the front doors 15, 16 of the box 13, and remove the suspension bodies 20, 20' of the cover 19 for preventing the spread of the accompanying flow from the shafts 21, 21' for holding them. Heating roller 11,
Secure threading space for 12 turns. After that, the heated roller 1 is wound several times around the rollers 11 and 12 using a special thread hook such as a suction gun (not shown).
Complete threading to 1 and 12. At this point, the air within the box 13 becomes a rotating airflow accompanying the heating roller rotating at high speed, and is turbulently diffused within the box. Here, the removed cover 19 is inserted and fixed along the shafts 21, 21' and closely surrounds the heating rollers 11, 12. Thereafter, the box front doors 15 and 16 are closed.

In this case, a cover 19 that surrounds the heating rollers 11 and 12 is movably disposed in a box 13 that surrounds the heating rollers 11 and 12 that transfer and heat-treat the yarn. For,
Preventing the accompanying rotating airflow throughout the box induced by the heating rollers 11 and 12 rotating at high speed,
It is possible to prevent the surface of the heating roller from being constantly cooled by fresh air (air located at a distance from the roller), and the power consumption of the heater can be significantly reduced. Furthermore, since a large space can be secured around the roller when threading, threading work can now be done easily and safely. In particular, if oil smoke generated by yarn processing is discharged from the box 13 to the outside (atmosphere) by a blower or the like through a duct to prevent it from filling the room, However, by providing the plate 19 as in the present invention, the air inside the cover 19 can be effectively prevented from escaping. Extremely effective.

Even if the exhaust suction power is increased and the gas inside the box 13 is strongly exhausted, the fresh air from the thread guide slits etc. is mainly sucked in, and the cover 19 acts as a resistor to absorb the high temperature air inside the cover 19. Therefore, exchange of high-temperature air inside the cover 19 is extremely small, resulting in extremely low heat loss.

In this case, the oil and the like continuously emit smoke inside the cover 19, but the exhaust fumes leaking from the cover 19 due to the accompanying flow of the heating rollers 11 and 12 are removed from the exhaust port 3.
Adjusting the exhaust suction force so that it is discharged from zero along with the fresh air will be even more effective in terms of energy saving.

Next, to explain the effects of this invention in more detail,
Using the device shown in Figures 3 and 4, nylon 6 was heated at a heating roller temperature of 190°C and a speed of 2950 m/min.
The yarn was drawn and heat treated to obtain a drawn yarn of 1260 de/204 fil. In this case, the total heater load on the heating roller was 3.07KW, which was 4.60KW in the conventional device shown in Figures 1 and 2 (with forced exhaust).
and decreased. Furthermore, when the heating roller temperature was set to 220°C, the power consumption significantly decreased from 8.02KW to 3.44KW.

In this embodiment, a case has been described in which the cover for preventing the spread of the accompanying flow is made removable by a suspension method, but it may be made by any other means, for example, by a method in which it can be moved in and out in a telescopic manner. For example, a division method can be used as shown in FIGS. 5 and 6. That is, 23 is a cover divided into two parts, front and rear, and the rear cover 24 is the rear plate 13 of the box.
e, and the front cover 25 is further divided into left and right covers 26 and 27, which are attached to the front doors 15 and 16, respectively.
The front left and right covers 26 and 27 are also opened and closed at the same time when the front doors 15 and 16 are opened and closed. That is, the front doors 15, 16
When closed, the left and right covers are in contact with or close to the rear cover 24 (they may overlap). Therefore, in this case, when the front doors 15 and 16 are opened, a space for threading is secured at the tip of the roller as shown in FIG. 6, and when this is closed, a cover is automatically formed to prevent the diffusion of the accompanying flow. becomes.

In the above explanation, the box has a structure that can be opened and closed by the front door, but it may also be opened and closed by a sliding type or other method, or the box may have a double structure with a heat insulating material in the middle. It goes without saying that it can be used in combination with various other means.

As explained above, according to the present invention, the accompanying rotating airflow inside the box caused by the heating roller that rotates at high speed is prevented, the escape of high-temperature air near the heating roller is reduced, and the leakage of fumes such as oil into the room is prevented. This greatly improves the heating effect and significantly reduces power consumption, which is extremely effective in terms of energy consumption and environmental hygiene or conservation.

[Brief explanation of drawings]

1 and 2 are a front sectional view and a side sectional view showing a conventional embodiment, FIG. 3 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 4 is a cross section taken along the line A-A in FIG. 5 and 6 are explanatory diagrams showing other embodiments. 11, 12... Heating roller, 13... Box, 15, 16... Front door, 19... Cover, 2
0, 20'... Suspension body, 21, 21'... Shaft, 30... Exhaust port, 31... Exhaust pipe.

Claims (1)

[Claims for Utility Model Registration] 1. A box surrounding the heating roller that heat-treats the yarn is provided, and a cover for preventing the diffusion of accompanying flow is enclosed in the box in close proximity to the heating roller. A yarn heat treatment apparatus characterized in that the box is provided with an exhaust port communicating with forced exhaust means. 2. The yarn heat treatment apparatus according to claim 1, wherein the heating roller is a pair of actively rotating heating rollers. 3. The yarn heat treatment apparatus according to claim 1 or 2, wherein a part or all of the cover is attached to the heating roller so that it can be moved to another location or detached from the heating roller.