JPH0129049Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a tire manufacturing device called an autoclave or pot heater used for curing tires for large vehicles such as construction machinery. The above-mentioned tire manufacturing apparatus is manufactured based on the first class pressure vessel structural standard, and FIG. 1 is a sectional view showing the overall structure of the conventional apparatus.

In FIG. 1, an upper dome 1 is detachably connected to a lower dome 2 via a connecting ring 3 to block outside air.
It supports the load (press force F) due to the water pressure or oil pressure P in the cylinder 6 and the load due to the steam pressure q in the lower dome 2. Molds 7 containing green tires 8 to be cured are stacked on a mold table 4 in three to four stages.

The flexible hose 9 is for supplying hot water and cooling water to the green tire 8, and is connected to each mold 7 and the upper dome 1 at points A and B. The nozzles 10a and 10b are for cooling the mold 7, and are attached to the lower dome 2 at 10 locations around the circumference.

FIG. 2 is a sectional view showing the detailed structure of the upper dome 1.

In FIG. 2, the press force F acting on the upper dome 1 is equal to the ram 5 and mold table 6 shown in FIG.
from the mold 7 through the upper dome 1 shown in FIG.
After being transmitted from the ceiling plate 14, radial rib 12, circumferential rib 13 and spherical shell 11 to the body plate 15 of the spherical shell part,
Furthermore, it is transmitted to the lower dome 2 via the connecting ring 3. Moreover, the press force F, the steam pressure q within the dome, and the heat load during mold cooling act on the upper dome 1 at the same time.

FIGS. 3a to 3d are diagrams showing the detailed structure and stress distribution of a conventional upper dome fillet weld (section C in FIG. 2).

When press force F and internal pressure q are applied to the upper dome 1, the stress distribution on the D-D cross section shown in Fig. 3b is a combination of uniform tensile stress 6t and bending stress 6b, but there is no stress concentration. Therefore, the stress is not high and the distribution is linear.

On the other hand, in the fillet welds 14w of the E-E and F-F cross sections, the bending stress 5b increases as the ceiling plate 14 is pushed up by the press force F, and stress concentration occurs because the fillet welds are fillet welds. This results in high stress, resulting in stress distributions as shown in Figures 3c and d, respectively.

The upper dome 1 is heated during tire vulcanization, but when cooling the mold after vulcanization, cooling water from the nozzle 10a is injected to the outside of the mold 7 for several minutes as shown in FIG. Cooling water that has hit the mold 7 scatters on the fillet weld 14w, generating thermal stress. When this thermal stress occurs, the stress in the fillet weld becomes even higher than the stress distribution shown in FIG. 3.

As described above, the upper dome fillet weld 14w is
The thermal stress caused by the cooling water was added to the stress caused by the ceiling panel being pushed up by the pressing force, creating a high stress that became a weak point in terms of strength, so it was necessary to make the upper dome strong.

The present invention has been proposed in view of the above-mentioned points, and its purpose is to provide a tire manufacturing device that eliminates the drawbacks of conventional devices and eliminates weak points in terms of strength.

The present invention provides a tire manufacturing apparatus that connects an upper dome and a lower dome to vulcanize a tire therein, and a ceiling plate is placed inside a spherical shell constituting the upper dome, and the spherical shell is disposed within an extension surface of the ceiling plate. It is characterized in that it is arranged with a gap between it and the inner peripheral surface of the spherical shell, and is connected to the spherical shell through a rib fixed in the spherical shell, and as described above, the ceiling plate and the spherical shell are By creating a gap between them and connecting the ceiling plate to the spherical shell via ribs, there is no direct connection between the ceiling plate and the spherical shell, which eliminates any weak points in terms of strength. can.

The present invention will be described above based on the embodiment shown in FIG.

In Fig. 4, 21 is a spherical shell, 22 is a radial rib,
24 is a ceiling plate, 25 is a body plate, 26 and 27 are welded parts between the radial rib 22, the ceiling plate 24 and the spherical shell 21, and the ceiling plate 24 has a gap with the inner circumference of the opening of the spherical shell 21. The spherical shell 2
Connected to 1. Further, the end portion 22a of the radial rib 22 is rounded to improve the transmission of force. Although the circumferential ribs are not shown, it is assumed that they are provided in the same manner as the circumferential ribs 13 shown in FIG.

In the above configuration, the press force and internal pressure acting on the upper dome are transmitted from the ceiling plate 24 to the radial ribs 22 and the circumferential ribs, and reach the body plate 25 via the spherical shell 21 and the welded portion 21w.

Here, the ceiling plate 24 is connected to the spherical shell 21 via the radial ribs 22 and the circumferential ribs, and since the ceiling plate 24 and the spherical shell 21 are not directly connected but separated, the ceiling plate 24 is pressed. It cannot be bent by force or internal pressure.

Therefore, the high stress that occurs in the E-E cross section and the F-F cross section described in the conventional example is not generated.
Even if thermal stress is applied due to cooling with cooling water, there will be no weak points in terms of strength, so damage accidents can be reliably avoided without increasing the rigidity of the upper dome and keeping the structure simple. I can do it.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the overall structure of the conventional one.
Fig. 2 is a sectional view showing the detailed structure of the upper dome, Figs. are cross sections D-D, E-E, respectively.
FIG. 4, which is a stress distribution diagram along line F-F, is a sectional view of only the main parts showing an embodiment of the present invention. 1... Upper dome, 2... Lower dome, 21... Spherical shell, 2
2... Radiation rib, 24... Ceiling board.

Claims (1)

[Scope of utility model registration request] In a tire manufacturing apparatus that combines an upper dome and a lower dome and vulcanizes the tire therein, a ceiling plate is provided inside a spherical shell constituting the upper dome, and the inner periphery of the spherical shell is disposed within an extension of the ceiling plate. A tire manufacturing device characterized in that the tire manufacturing device is arranged with a gap between the tire manufacturing device and the spherical shell, and is connected to the spherical shell via a rib fixed in the spherical shell.