JPS6319126Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a shaping height positioning device for unvulcanized tires in a tire vulcanizer. The present invention relates to an improvement in a shaping height positioning device that matches the bladder height to the unvulcanized tire height in order to match the tire and bladder.

As shown in FIG. 1, a conventional tire vulcanizing machine uses a piston sleeve spacer 3 that is loosely inserted into a piston rod 2 to adjust the height of the upper ring 1. configured to set. Therefore, after the completion of vulcanization, pressurized fluid is injected into the lower chamber a of the cylinder 7 to raise the upper ring 1 as shown in FIG. When the tire 5 is removed from the bladder 4, the piston sleeve spacer 3, which sets the height position of the upper ring 1, is movable relative to the piston rod 2, so that when the upper ring 1 is lowered next time. There is a problem in that the bladder 4 is caught between the lower surface of the upper ring 1 and the upper surface of the piston sleeve spacer 3, resulting in damage.

This problem has been solved in order to improve the productivity of tire vulcanization.
As the wall thickness of the bladder is currently being reduced, the rigidity of the bladder has become smaller than that of conventional bladders, and the above-mentioned bladder breakage accidents tend to occur frequently.

This idea was created in view of the above-mentioned current situation.
It is an object of the present invention to provide an extremely effective and suitable device for positioning the shaping height of an unvulcanized tire in a tire vulcanizer, which completely eliminates the above-mentioned problems.

The feature is that a locking means whose position can be directly adjusted is provided in the upper half of the piston rod, and piping is provided for bringing the locking means and the piston sleeve closer to and away from the piston rod and the piston sleeve. By providing the system, the upper ring is prevented from biting the bladder when lowering during the negative pressure inside the bladder.

Hereinafter, the present invention will be explained by way of examples with reference to the drawings.

The device for positioning the shaping height of an unvulcanized tire in a tire vulcanizer according to the present invention, shown in FIGS. In a tire vulcanizer having a bag cylinder mechanism consisting of a piston 9 equipped with a rod 2 and a piston sleeve 8 into which the piston rod 2 is loosely inserted, a locking mechanism is provided in which the position can be directly adjusted in the upper half of the piston rod 2. The locking means 10 is provided on the piston rod 2 and the piston sleeve 8.
It is constructed by providing a piping system A that brings the piston sleeve 8 and the piston sleeve 8 closer to each other and separates them from each other.

The specific structure of the locking means 10 will be explained below using examples thereof.

First, in the first embodiment shown in FIG. 6, several grooves 10a are provided at required positions in the upper half of the piston rod 2 at intervals in the circumferential direction, and the grooves 10a are arranged at intervals corresponding to the desired shaping height. The groove 10a located in
A locking ring 10b is removably fitted to the shaft, and the shaping height can be adjusted by changing the fitting position of the locking ring 10b according to the shaping height. .

In addition, in the second embodiment shown in FIG.
0c, and attach a double nut 1 to this screw 10c.
The shaping height can be adjusted by changing the screwing position of the double nut 10d in accordance with the shaping height.

Further, in the third embodiment shown in FIG. 8, as shown in the figure, the piston rod 2 is provided with a
Loosely insert the locking ring 10e, and
A set screw 10f is screwed into the locking ring 10f, and the shaping height can be adjusted by changing the locking position of the locking ring 10e in accordance with the shaping height.

In this specification, the specific structure of the locking means 10 has been explained using three embodiments as described above, but the locking means 10 may be constructed using a method other than using the spacer 3 as in the conventional one. Of course, as long as it is a locking means, it is not limited to those of the above embodiments.

Note that 6 in the figure is the lower mold.

Next, while comparing the operating states of the conventional device shown in FIGS. 1 and 2 and the device for positioning the height of unvulcanized tire shaping according to the present invention shown in FIGS. 3 and 4, the present invention will be explained. Explain the effects of

In the conventional device shown in FIGS. 1 and 2, when pressurized fluid is pressurized into the chamber b between the piston sleeve 8 and the piston 9 through the piping system A, the piston sleeve 8 rises and the piston 9 descends. In order to
The piston sleeve 8 rises and remains stationary until it comes into contact with the lower surface of the piston sleeve. Therefore, when the upper ring 1 descends when the bladder is under negative pressure, the bladder 4 may be caught between the upper end of the piston sleeve spacer 3 and the lower surface of the upper ring 1, and there is a risk that the bladder 4 will be damaged. be.

On the other hand, in the case of the present invention, when pressurized fluid is pressurized into the chamber b between the piston sleeve 8 and the piston 9 through the piping system A, the piston sleeve 8
The piston rod rises until it comes into contact with the gland 11 and remains stationary. On the other hand, since the piston 9 descends, the piston rod 2 also descends, but the piston rod 2
is provided with the above-mentioned locking means 10,
This locking means 10 abuts against the piston sleeve 8, and the piston rod 8 remains stationary. In this way, in the present invention, when the upper ring 1 is lowered, its lower surface does not hit the spacer 3 etc. as in the conventional case, so even if the upper ring 1 is lowered when the pressure inside the bladder is negative, the bladder 4 will not be bitten. There is no

As mentioned above, in the present invention, since the locking means is provided in the upper half of the piston rod, the position of which can be directly adjusted, it is possible to completely prevent the bladder from being caught when the upper ring is lowered when the bladder is under negative pressure. The effects are extremely large, such as not only the service life of tires can be significantly extended, but also the bladder wall thickness can be made thinner, and the productivity of tire vulcanization can be significantly improved.

[Brief explanation of the drawing]

Figures 1 and 2 respectively show a device for positioning the shaping height of an unvulcanized tire in a conventional tire vulcanizing machine. Figure 1 is a cross-sectional view of the piston rod being lowered, and Figure 2 is FIG. 3 is a sectional view of the piston rod raised; Moreover, FIGS. 3 to 8 show embodiments of the present invention.
The figure is a sectional view of the piston rod being lowered, and Figure 4 is a sectional view of the piston rod being raised.
FIG. 5 is an enlarged sectional view of the main part of the piston rod with the piston rod lowered, and FIGS. 6 to 8 are explanatory views of each embodiment showing the locking means. 1... Upper ring, 2... Piston rod, 7
...Cylinder, 8...Piston sleeve, 9...
Piston, 10...Locking means, A...Piping system.

Claims (1)

[Scope of utility model registration request] a cylinder; a piston having a rod within the cylinder and having an upper ring at its upper end;
In a tire vulcanizer having a bag cylinder mechanism consisting of a piston sleeve into which the piston rod is loosely inserted, a locking means whose position can be directly adjusted is provided in the upper half of the piston rod, and the piston rod and the piston sleeve are provided with a locking means that allows direct position adjustment. A shaping height positioning device for an unvulcanized tire in a tire vulcanizer, characterized in that a piping system is provided for bringing a locking means and a piston sleeve closer to each other and separating them from each other.