JP3285384B2 - Continuous conveying hot air vulcanizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for vulcanizing an unvulcanized rubber product, and more particularly to an improvement in an apparatus for vulcanizing a long rubber product by blowing hot air while continuously transporting the same.

[0002]

2. Description of the Related Art In general, a continuous conveying hot air vulcanizing apparatus is used for vulcanizing long rubber products. Particularly, the cross-sectional shape is complicated and dimensional accuracy is required, for example, sponge rubber products and the like. For vulcanization, a continuous transport hot air vulcanizing apparatus that combines roller transport and hot air circulation is often used.

A conventional continuous conveying hot air vulcanizing apparatus is shown in FIGS.
The upper air duct 8a and the lower air duct 8b, which are continuously conveyed and are vertically symmetrical about a long rubber product (hereinafter referred to as a work) A to be vulcanized,
Are provided. Note that the NN line is a line indicating the transport direction of the work A.

The air ducts 8a and 8b have a work A
A plurality of nozzle bodies 9 are vertically symmetrically provided toward the work A at a pitch of P in the transport direction of the nozzle. A slit nozzle 10 for jetting hot air is provided at the tip of the nozzle body 9, and the slit nozzle 10 is attached to the air ducts 8 a and 8 b so as to form an angle of 90 ° with the NN line. The width W1 of the slit nozzle 10 is about 3 to 5 mm,
The length L is slightly shorter than the width W2 of the air ducts 8a and 8b.

Next, the operation of the above conventional apparatus will be described. The hot air heated by the heater (not shown) is sent into the air sending ducts 8a and 8b by an air sending fan (not shown), and blows out from each slit nozzle 10. The hot air is blown out over the entire length of the slit nozzle 10, and while slightly spreading in the direction of the NN line, as indicated by arrows in FIG.
Work A is reached.

FIG. 9 is a view for explaining the flow of hot air in a horizontal plane equidistant from the upper and lower slit nozzles 10, and 10c indicates the center line of the hot air ejected from the upper and lower slit nozzles 10. , W3 indicate the width of the work A.

A portion of the hot air from above and below collides with the work A at the collision portion D, and the top and bottom surfaces of the work A are heated. The hot air that does not collide with the work A collides with the hot air from above and below, and is diffused to the diffusing portion E. Then, after that, it moves to the recirculation portion F which is located in the middle of the adjacent nozzle body 9, and further circulates toward the blower fan by the suction negative pressure of the blower fan. The hot air thus flowing surrounds the work A as an atmosphere, and the heat heats the peripheral surface (particularly, the side surface) of the work A.

[0008]

In the conventional continuous conveying hot air vulcanizing apparatus as described above, the hot air directly collides with the upper surface and the bottom surface of the work A at the collision portion D, so that the work is relatively easily heated. The hot air diffused into the diffusion portion E by the collision of the hot air from the air blower is pulled in the direction away from the work A by the suction negative pressure of the blower fan, so that the side surface of the work A is hardly heated. In addition, the flow of the hot air in the recirculation portion F is too smooth, and the hot air flows out quickly, so that the ambient temperature surrounding the work A is unlikely to rise, resulting in insufficient heating of the side surface of the work A. Had become. When the thickness of the work A is large, wide, and when the cross-sectional shape is complicated,
Underheating to the side was more pronounced.

Further, in the conventional apparatus, the ambient temperature is unlikely to rise as described above, and the temperature is particularly low immediately after the start of operation, so that it takes about one hour from when the heater or the blowing fan is started to when the vulcanization work is actually started. There is also a problem that a warm-up operation of up to 2 hours is required, which results in a loss of time and an increase in operation cost. Although it is conceivable to provide a partition weir or the like for blocking the reflux portion F, it is not practical because the effect of increasing the ambient temperature is insufficient and adverse effects such as a decrease in operability occur. Absent.

The present invention has been made in view of the above-described problems, and provides uniform heating over the entire surface of a thick work, a wide work, or a work having a complicated cross-sectional shape. It is an object of the present invention to provide a continuous conveying hot air vulcanizing apparatus which can be performed and does not require a long-time warm-up operation as in the conventional apparatus.

[0011]

Means for Solving the Problems In order to solve the above-mentioned object, a continuous conveying hot air vulcanizing apparatus according to the present invention comprises a plurality of continuous conveying hot air vulcanizers provided on a top and a bottom of a continuously conveyed work in a conveying direction of the work. In a continuous conveying hot air vulcanizing apparatus provided with a slit nozzle and jetting hot air from the slit nozzle to vulcanize a work, hot air from one slit nozzle on one side is transmitted from two or more slit nozzles on the other side. An upper slit nozzle and a lower slit nozzle are provided in oblique directions opposite to each other with respect to the workpiece transfer direction so as to intersect with hot air.

[0012]

[Action] Therefore, the hot air from each of the upper and lower slit nozzles directly collides with and heats the work, and at the intersection where the hot air from above and below intersects, the hot air collides with each other and diffuses. In, because the hot air from one side hinders the recirculation of the hot air on the other side and stays, the temperature of the entire atmosphere surrounding the work is raised to near the temperature of the hot air ejected from the slit nozzle,
The entire peripheral surface of the work including the side surface is uniformly heated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 6. Reference numeral 1 denotes a box-shaped main body, and an inlet 2 and an outlet 3 for a work A are provided before and after the main body 1. The inside of the main body 1 is vertically divided by a partition plate 4 except for a part, and a heater 5 and a blower fan 6 are provided above the partition plate 4.

A plurality of rollers 7 for transporting the work A from the inlet 2 to the outlet 3 are rotatably mounted below the partition plate 4, and are vertically symmetrical about the work A transported by the rollers 7. Are provided with an upper air duct 8a and a lower air duct 8b. Ventilation duct 8
One end of a is connected to the blower fan 6, and one end of the blower duct 8b is also connected to the blower fan 6 via the relay duct 8c. Note that the NN line is a line indicating the transport direction of the work A.

Further, the ventilation ducts 8a and 8b include:
A plurality of nozzle bodies 9 are arranged at a pitch of P
Are provided vertically symmetrically toward the work A. The nozzle body 9 is formed by sheet metal processing from a thin plate, and has a slit nozzle 10 at a tip thereof for blowing hot air, and the nozzle body 9 is formed so that the slit nozzle 10 forms an angle θ with the NN line. It is attached to the ventilation ducts 8a and 8b with screws in an oblique direction. Although the upper slit nozzle 10 provided in the air duct 8a and the lower slit nozzle 10 provided in the air duct 8b have the same angle θ,
As can be seen from FIG. 3, the oblique direction is reversed. Reference numeral 11 denotes an exhaust fan provided on the ceiling of the main body 1.

The operation of the embodiment configured as described above will be described. The hot air heated by the heater 5 is sent into the blowing ducts 8a and 8b by the blowing fan 6,
It is ejected from each slit nozzle 10. After the heated hot air heats the work A, it flows toward the inlet 2 through the gap B between the side surfaces of the air ducts 8 a and 8 b and the side wall of the main body 1, and from the opening C of the partition plate 4 to the upper side of the partition plate 4. Go out and
Part of it is exhausted to the outside by the exhaust fan 11,
Mostly, a hot air circulation path is formed to reach the blower fan 6 again via the heater 5.

FIG. 5 shows that the angle θ is 45 °, the pitch P of the slit nozzle 10 is 110 mm, the width W2 of the air ducts 8a and 8b is 240 mm, and the width W3 of the work A is 40 mm.
FIG. 3 is a diagram for explaining the flow of hot air in a horizontal plane equidistant from each of the upper and lower slit nozzles 10 when mm is set, 10a is the center line of the hot air from the upper slit nozzle 10, and 10b is the lower slit. The center line of the hot air from the nozzle 10 is shown.

The hot air jetting from the upper slit nozzle 10 and the hot air jetting from the lower slit nozzle 10 intersect at a plurality of intersections G. Then, when the work A is conveyed, the hot air from above and below collides with the work A in the collision portion D, and heats the upper surface and the bottom surface of the work A.

At the intersection G, which does not reach the work A, the hot air from above and below collides and diffuses to the diffusion portion E.
Further, in a portion where hot air does not collide with each other, hot air from one side is blown to a portion corresponding to the middle of the adjacent nozzle body 9 on the other side (a portion corresponding to the recirculation portion F in the conventional device), and this portion is blocked in an air curtain shape. Forming the interruption part H.

As described above, in the present invention, since the diffusion portion E and the blocking portion H are combined in a mesh shape,
The hot air diffused to the diffusing section E is not pulled away from the work A unlike the conventional apparatus. Further, in the conventional apparatus, the flow of hot air in the recirculation section F is smooth, and therefore the temperature rise in this section is slow. However, in the present invention, since the section corresponding to the recirculation section F is blocked by the blocking section H, the hot air stays. , The temperature rises quickly.

Therefore, the entire atmosphere surrounding the work A is maintained at a temperature close to the temperature of the hot air blown from the slit nozzle 10, so that the entire peripheral surface of the work A including the side surfaces is uniformly heated. . Further, since the temperature rises quickly, the warm-up operation is not required or can be completed in a very short time.

FIG. 6 shows that the angle θ is 64 °, the pitch P of the slit nozzle 10 is 50 mm, and the air ducts 8a and 8b
FIG. 4 is a diagram illustrating the flow of hot air in a horizontal plane equidistant from the upper and lower slit nozzles 10 when the width W2 of the workpiece A is 230 mm and the width W3 of the work A is 70 mm.

As described above, according to the present invention, uniform heating can be performed on any work A by selecting the angle θ and the pitch P according to the dimensions (width and thickness) and cross-sectional shape of the work A. It becomes possible. Generally, the angle θ is 3
The pitch P may be selected within the range of 0 to 80 ° and within the range of 30 to 200 mm.

In a horizontal plane equidistant from each of the upper and lower slit nozzles 10, the number of hot air from one slit nozzle 10 on one side intersects with the hot air from another slit nozzle 10 on the other side. If the width W2 of the air ducts 8a and 8b is the same, the width varies depending on the selection of the angle θ and the pitch P. However, in the present invention, since it is necessary to form the diffusion portion E and the blocking portion H, one slit on one side is required. It is desirable that the hot air from the nozzles 10 cross the hot air from two or more, preferably three or more, slit nozzles 10 on the other side.

The "horizontal plane equidistant from the upper and lower slit nozzles 10" in the embodiment should theoretically coincide with the "horizontal plane including the center line in the thickness direction of the work A". Unless the height of the roller 7 is adjusted according to the thickness of the work A, it is considered that the two often do not match. However, it may be considered that there is no problem in practice if there is a slight deviation.

[0026]

According to the present invention, a work having a large thickness,
Even for wide workpieces or workpieces with complex cross-sectional shapes, uniform heating can be performed on the entire peripheral surface, and warm-up operation after the start of operation is unnecessary or extremely short, and operating costs are low. Can also save money.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a continuous conveying hot air vulcanizing apparatus according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a cross-sectional view showing a mounting state of a slit nozzle in the embodiment of the present invention, cut along a center line in a work conveyance direction.

FIG. 4 is a plan view showing an attached state of a slit nozzle in the embodiment of the present invention.

FIG. 5 is a diagram illustrating a flow of hot air in a horizontal plane equidistant from each of upper and lower slit nozzles in the embodiment of the present invention.

FIG. 6 is a diagram illustrating a flow of hot air in a horizontal plane equidistant from each of upper and lower slit nozzles in another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a state of attachment of a slit nozzle in a conventional continuous transport hot air vulcanizing apparatus, cut along a center line in a workpiece transport direction.

FIG. 8 is a plan view showing an attached state of a slit nozzle in a conventional continuous conveyance hot air vulcanizing apparatus.

FIG. 9 is a view for explaining a flow of hot air in a horizontal plane equidistant from upper and lower slit nozzles in a conventional continuous conveyance hot air vulcanizing apparatus.

[Explanation of symbols]

 10 Slit nozzle A Work G Intersection NN Line indicating the work transfer direction θ Angle between the slit nozzle and the work transfer direction

Claims (1)

(57) [Claims] 1. A plurality of slit nozzles are provided in an upper and lower side of a continuously conveyed work in a conveying direction of the work, and continuous conveyance is performed by blowing hot air from the slit nozzles to vulcanize the work. In the hot air vulcanizing device, the upper slit nozzle and the lower slit nozzle are moved in the direction of the workpiece transfer so that the hot air from one slit nozzle on one side crosses the hot air from two or more slit nozzles on the other side. A continuous conveying hot air vulcanizing device, which is provided in oblique directions opposite to each other.