JPH0250848B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bag (bladder) adjustment device in a tire vulcanizer, and in particular, by eliminating a spacer for adjusting the height of the bag, the life of the bag is extended and As a secondary measure, the piston sleeve was also abolished in an attempt to improve sealing performance.

First, a conventional tire vulcanizer will be outlined with reference to FIGS. 1 to 3 and FIG. 7.

1 is a piston 2 that moves up and down inside the bug cylinder 6
a piston rod, the piston rod 1
An upper ring 4 that engages one end of a bag (bladder for vulcanization) 8 is attached to the holder. The other end of the bag 8 is secured to the lower ring 5, and high-temperature, high-pressure air is supplied to the inside of the bag 8 through a passage 16. 7 is a lower mold, 12 is an upper mold, 9 is a tire charging device, 11 is a piston spacer, and 10 is a green tire.

FIG. 1 shows an initial state in which the upper ring 4 is raised and the green tire 10 is loaded into the vulcanizer, and at this time, the bugs 8 are attracted to the piston spacer side by the internal negative pressure. Then, in order to adjust the height of the bug 8 from this state, the upper ring 4
However, as the piston 2 descends, it descends to a state where it contacts the piston spacer 11. This is the state shown in FIG. At this time, in the worst case, a situation occurs in which the bug 8 is bitten between the upper ring 4 and the piston spacer 11. In order to solve this problem, conventionally, for example,
As disclosed in Publication No. 53-41378, support rods are installed on both sides of the vulcanizing device, and a slidable light emitting tube and a light receiving tube are attached to the support rods in accordance with the height dimension of the green tire. A positioning device that controls the installation and operation of a hydraulic cylinder, and
As disclosed in Publication No. 48-44191, there is a tire curing press in which expansion and contraction of the plug is controlled by opening and closing the fluid control valve of the cylinder using a proximity switch arranged vertically adjustable on the outside of the cylinder. A central mechanism is proposed.

However, with such conventional devices, it is necessary to adjust the height positions of the light emitting tube and light receiving tube each time the tire height changes (changes in size), and the position of the proximity switch. In addition to poor workability, this process requires a lot of effort and time, making it difficult to increase productivity. One of the purposes of the present invention is to eliminate such drawbacks of the conventional device, and in particular, in response to tire height changes (size changes), a detection device installed in a tire loading device for green tires is used to detect the height of the upper ring. By detecting the height and making bug adjustments, there is no need to position the detection device every time the tire height changes.

Note that FIG. 3 shows the state from the start of vulcanization to the end of vulcanization, and at this time, the upper ring 4 is pushed up from below by the piston spacer 11, so it will not fall any further.

Also, the lid 14 of the bag cylinder 6 comes into contact with the piston spacer 11 during vulcanization (in the state shown in Figure 3) (see Figure 7), and from this point the steam or hot water inside the bag 8 leakage is likely to occur. Therefore, as a countermeasure for conventional equipment,
Although the piston sleeve 3 was provided with a sealing material 15, the present invention also aims to improve this sealing device.

Next, embodiments of the present invention will be described with reference to FIGS. 4 to 6 and FIG. 8. Furthermore, Fig. 4 corresponds to Fig. 1 showing the conventional example, Fig. 5 corresponds to Fig. 2, Fig. 6 corresponds to Fig. 3, and Fig. 8 corresponds to Fig. 7. The same reference numerals are given to the common parts to clarify the correlation.

Now, in FIGS. 4 to 6, reference numeral 13 is a limit switch, which is provided in the green tire charging device 9. In the state shown in FIG. teeth
It is in the OFF state. When the state shown in FIG. 5 is achieved by lowering the piston 2 and lowering the upper ring 4 to adjust the bag height, the operating arm 13 of the limit switch 13 rotates and the contact point is turned on. The valve of the operating pressure water acting on the piston 2 is closed by this signal, and the lowering of the upper ring 4 is stopped at this height. Therefore, a piston spacer (indicated by the symbol "1" in FIGS. 1 to 3) is used to stop the lowering of the upper ring 4.
1) is no longer necessary.

There is no difference from the conventional example in that the process then shifts to the vulcanized state shown in FIG. Note that FIG. 6 shows a state in which the upper ring 4 is further lowered from the state shown in FIG. 3 in order to separate the bag from the tire after vulcanization.

Although the same members as the piston sleeve 3 in the conventional device are shown in FIGS. 4 to 6,
As is clear from a comparison of FIGS. 4 to 6, member 3 has not been displaced at all. In other words, the piston sleeve 3 is not necessary in the device of the present invention (therefore, the piston sleeve 3 should naturally be omitted from FIGS. 4 to 6, but is shown for convenience of explanation).
The sealing material 15 provided on the piston sleeve 3 in the conventional device can be attached to both sides of the lid 14 as indicated by 15a and 15b, as shown in FIG. 8, to seal the bag cylinder 6 and the piston rod 1. can be retained.

It is clear that a proximity switch may be used as the limit switch 13.

As described above, in the present invention, the lowering of the upper ring is stopped by operating the operating pressure water valve for lowering the upper ring based on the signal from the upper ring height detection device attached to the green tire loading device. Since the height of the upper ring can be set by adjusting the height of the upper ring, the piston spacer previously required for back adjustment can be eliminated, and as a result, the life of the bag can be significantly increased. In addition, the positions of phototubes, proximity switches, etc. can be adjusted as before.
There is no need to make adjustments for changes in tire height (size), which improves work efficiency.
This has the effect of improving productivity. Furthermore, since the seal between the bag cylinder and the piston rod can be achieved by a fixed sealing material, it is possible to achieve effects such as being able to improve the sealing performance at this location.

[Brief explanation of drawings]

1 to 3 are side sectional views showing the operating state of a conventional tire vulcanizer, and FIGS. 4 to 6 are side sectional views showing the operating state of the tire vulcanizer according to the present invention. FIG. 7 is a side sectional view of a sealing portion of a conventional tire vulcanizer, and FIG. 8 is a side sectional view of a sealing portion of a tire vulcanizing machine according to the present invention. 1... Piston rod, 2... Piston, 3...
...Piston sleeve, 4...Upper ring, 5...
Upper ring, 6... Bag cylinder, 8... Bag (vulcanizing bladder), 9... Charging device, 10... Green tire, 11... Piston spacer, 12
... Upper mold, 13 ... Limit switch, 14
...Lid, 15, 15a...Sealing material.

Claims (1)

[Claims] 1 A detection device for detecting the height of the upper ring attached to the piston rod of the tire vulcanizer is installed in a tire loading device that loads green tires into a tire vulcanizer, and a detection signal from the detection device is provided. 1. A bug adjustment device for a tire vulcanizer, characterized in that the bug adjustment device for a tire vulcanizer is configured to control the operation of a bug cylinder to maintain a height position of an upper ring attached to the piston rod at a predetermined position.