JPS62201206A - Vulcanizing device - Google Patents

Abstract

PURPOSE:To make it possible to uniformly heat and vulcanize a green tire and consequently improve the quality of tire by a method wherein the discharging direction of high temperature liquid from a discharge port is directed upwards to the interior space of a bladder. CONSTITUTION:In the state that hot water 37 under high temperature and pressure is discharged from a discharge port 35 in a bladder 27 so as to circulate, the air or gas in the hot water 37 separated from the water and floats in the form of bubbles in such a manner as to stagnate at the upper portion 39a in the upper part of an interior space 39. Because the discharging direction of the discharge port 35 of a vulcanizing deice 21 is directed to the upper part of the interior space 39, bubble-shaped air or gas intending to stagnate is agitated by the hot water 37 so as to be uniformly distributed and prevented from stagnating. Consequently, the deterioration of the inner surface 27c of the bladder 27 at the early stage due to the high temperature oxygen in the air or gas is prevented from occurring. In addition, because the interior space 39 turns to have uniform temperature distribution by the hot water 37, which circulates from above to below along the inner surface 27c, a green tire contacting with the bladder 27 is heated and vulcanized under uniform temperature and consequently a vulcanized tire with excellent quality is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vulcanizing device, and more particularly, to an improvement in a discharge port for discharging high temperature liquid into a bladder during tire vulcanization.

(Prior Art) Conventionally, as a discharge port of a vulcanizing device, for example,
There is one related to Publication No.-185134.

This is to supply gas such as steam and gas to the inside of the bladder in the tire, and a baffle plate is provided between the upper and lower clamping rings with a slight gap from the clamping ring, and is higher than the steam supply port. Gas is injected through the gap from a gas supply port separately provided at a location, and gas and steam are supplied from two separate supply ports, and the difference in specific gravity between the gas and steam is utilized for vulcanization. This equalizes the temperature difference between the upper and lower parts of the room. Using steam, gas, etc. as a vulcanizing medium is fine for tires that are not very large, such as those for passenger cars, but for large tires for large vehicles such as lotuses and trucks, the heat capacity may be low. Depending on the difference, high temperature liquid (warm water) is often used as the vulcanization medium.

As a vulcanizing apparatus that uses a high-temperature liquid as a vulcanizing medium, there is a conventional vulcanizing apparatus as shown in FIG. 6, for example.

This conventional vulcanizing device 1 includes a bladder 7 that is housed inside a green tire 5 in a curing mold 3, and a pair of bladder rings 9 that respectively hold an upper end 7a and a lower end 7b of the bladder 7. There is.

High-temperature, high-pressure liquid (hot water) 11 is discharged from the center of the vulcanization bag W1 into the bladder 7 through one discharge port 13 with a circular cross section formed by a pair of upper and lower bladder rings 9, and is discharged into the bladder 7 into the annular inner space of the bladder 2. 15 and is discharged from an outlet (not shown) provided on the side substantially opposite to the outlet 13 of the bladder ring 9.

(Problems to be Solved by the Invention) However, when the high-temperature, high-pressure hot water 11 is discharged into the space 15 in the bladder 7, the air or gas in the hot water 11 becomes bubble-like, and the air or gas is separated from the hot water. Alternatively, the gas tends to float up and accumulate in the upper part 15a of the internal space 15 of the bladder 7. For this reason, the upper part 15 of the internal space 15 of the bladder 7
There is a problem in that a temperature difference occurs between a and the lower part 15b, resulting in a difference in the degree of vulcanization between the upper sidewall 17 and the lower sidewall 18 of the green tire 5 that are in contact with this part. In addition, air and gas contain oxygen,
These oxygens are separated, and the inner surface 7 of the bladder 7 is heated under high temperature and high pressure.
There is also the problem that the inner surface 7c of the bladder 7 accelerates deterioration and shortens the lifespan of the bladder 7.

(Means for Solving the Problems) Therefore, in order to solve the above-mentioned problems, the vulcanizing device according to the present invention includes a bladder that is housed inside a green tire in a vulcanization mold, and an upper end of this bladder. A vulcanizing device that vulcanizes the green tire by discharging a high-temperature liquid into the bladder from a discharge port formed between the pair of bladder rings, the vulcanizing device comprising: a pair of bladder rings holding a lower end portion and a lower end portion,
The high-temperature liquid discharge direction of the discharge port is directed upward into the internal space of the bladder.

(Function) Since the discharge port of the vulcanizing device of the present invention is directed upward into the internal space of the bladder in the high temperature liquid discharge direction, the high temperature fluid discharged from the discharge port is directed upward into the internal space of the bladder. It circulates along the inner surface of the bladder, from the upper sidewall of the green tire to the trend and lower sidewalls, and is discharged from the exhaust port, so even if air or gas accumulates in the form of bubbles above the internal space, it will be removed. It is mixed into the discharged high-temperature liquid, stirred, distributed uniformly, and finally discharged. Therefore, a temperature difference does not occur between the upper and lower parts of the internal space, and the inner surface of the upper part of the bladder does not deteriorate prematurely.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 5 are diagrams showing an embodiment of the vulcanization apparatus according to the present invention. The vulcanizing device 21 includes an annular bladder 27 which is housed inside the green tire 25 in a vulcanizing mold 23 and is made of elastic rubber, and an upper end 27a and a lower end 2 of the bladder 27.
It is provided with a pair of upper and lower bladder rings 30 and 31 that respectively hold the bladder rings 7b. An upper protrusion 30a is provided on the lower side of the upper bladder ring 30 and protrudes downward over almost the entire circumference of the upper bladder ring 30, and an upper protrusion 30a that protrudes upward over almost the entire circumference of the lower bladder ring 31 is provided on the upper side of the lower bladder ring 31. A lower protrusion 31a is provided spaced apart from the protrusion 30a to form a gap 33. A gap 33 formed over almost the entire circumference between the pair of upper and lower bladder rings 30 and 31 also forms a discharge port 35, and this discharge port 35
The green tire 25 is heated and vulcanized by discharging high-temperature, high-pressure hot water (high-temperature liquid) 37 into the bladder 27. The discharge port 35 is
The above-mentioned upper protruding part 30a and lower protruding part 31a are formed so that the hot water 37 is directed upward in the internal space 39 of the bladder 27, and the opening cross-sectional area is narrowed as it goes radially outward. has been done. As shown in FIG. 3, the discharge port 40 is defined by a pair of baffle plates 42 in a part of the circumferential direction of the discharge port 35 between the upper and lower bladder rings 30 and 31, and faces in the radial direction. As shown in FIG.
It is formed into a rectangular cross section by cutting deeper than the three sides. The discharge port 40 communicates with a discharge passage 44 in the center of the lower plug ring 31.

Next, the effect will be explained.

When the green tire 25 is vulcanized using the vulcanizing device 21 of the present invention, high-temperature, high-pressure hot water 37 is discharged from the discharge port 35 into the bladder 27 and circulated. At this time, air or gas in the hot water 37 becomes bubble-like, separates from the hot water, floats, and tends to accumulate in the upper part 39a above the internal space 39 in the bladder 27. However, as shown in FIG. 1, the discharge port 35 of the vulcanizing device 21 of the present invention is formed such that the discharge direction of the high temperature liquid (warm water) 37 is directed upward to the internal space 39 of the bladder 27. Bubbly air or gas that tends to accumulate in the upper part 39a of the space 39 is removed from the hot water 3 to be discharged.
7 to uniformly distribute the air or gas, thereby preventing air or gas from accumulating in the upper part 39a. Therefore, the inner surface 27c of the bladder 27 does not deteriorate early due to high-temperature oxygen in the air or gas, and the life of the bladder 27 can be significantly extended.

In addition, the hot water 37 circulates from above to below along the inner surface 27C of the bladder 27, and the hot water 37 circulates from above to below the inner surface 27C of the bladder 27.
Since the temperature distribution is uniform from 9a to the lower part 39b, the raw tire in contact with the bladder 27 is heated and vulcanized at a uniform temperature from the upper part to the lower part, and a vulcanized tire of excellent quality can be obtained.

Further, the hot water 37 in the bladder 27 flows while circulating from the upper part 39a to the lower part 39b of the internal space 39 and repeats stirring and circulation in the circumferential direction, so that the inside of the bladder 27 has a uniform temperature distribution. Therefore, the thermal energy of the hot water 37 is effectively used for heating and vulcanization, shortening the vulcanization time of the green tire 25 and increasing tire production efficiency.

(Effects) As described above, according to the present invention, the temperature distribution is uniform in the upper and lower portions of the internal space within the bladder, allowing uniform heating and vulcanization of the green tire, and improving the quality of the tire. Further, it is possible to prevent early deterioration of the upper part inside the bladder due to oxygen in air or gas.

The hot water in the bladder is stirred and circulated, allowing the tire to be vulcanized at a uniform temperature, reducing vulcanization time and improving tire production efficiency.

[Brief explanation of drawings]

1 to 5 are diagrams showing one embodiment of the vulcanizing device according to the present invention, FIG. 1 is a half sectional view thereof, and FIG. 2 is a discharge port 3 thereof.
3 is an overall cross-sectional view showing both the discharge port 35 and the discharge port 40, FIG. 3 is a mm-m arrow directional view in FIG. Exit 40
FIG. 5 is a perspective view with the upper bladder ring 30 omitted, and FIG. 5 is an enlarged sectional view showing the opening cross section of the discharge port 40. FIG. 6 is a half-sectional view showing a conventional vulcanizing device. 21... Vulcanization device, 23... Vulcanization mold, 25... Green tire, 27... Bladder, 27a... Upper end 27b...Lower end part, 27C...Inner surface, 30...Upper bladder ring, 31...Lower bladder ring, 33...Gap, 35... Discharge port, 37... High temperature liquid, 39... Internal space, 39a... Upper part, 39b... Lower part, 40. ...Discharge port, 42...Baffle plate, 44...Discharge passage.

Claims (1)

[Claims] A bladder that is housed inside a green tire in a vulcanization mold, and a pair of bladder rings that hold the upper and lower ends of the bladder, respectively, and a discharge port formed between the pair of bladder rings. A vulcanizing device that vulcanizes the green tire by discharging high-temperature liquid into a bladder, characterized in that the high-temperature liquid discharge direction of the discharge port is directed upward into an internal space of the bladder.