JPS6235369B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a tire vulcanizer in which a bladder is lowered and retracted into an outer cylinder and stored therein after tire vulcanization is completed.

This type of tire vulcanizer was previously manufactured in
As shown in Publication No. 37518, a fluid pressure cylinder was used to move the center post up and down. This complicates the structure and increases the height of the base, which poses problems in terms of economy and maintainability.Furthermore, the heating medium for vulcanization is placed between the center post and the lower ring for holding the lower end of the bladder. It is necessary to attach a gasket to prevent leakage.
Maintenance of this is troublesome. There were other drawbacks.

The present invention has been proposed in order to address the above-mentioned problems, and includes a tire vulcanizer in which the bladder is lowered and retracted into an outer cylinder after tire vulcanization is completed, and is provided with an upper center portion of the bladder. The center post that holds the bladder is housed in a hole with a sealed pressure-resistant structure that is formed integrally with the lower ring that holds the lower end of the bladder, so that it can move up and down and be lowered by its own weight. The purpose of this invention is to provide a tire vulcanizer with a simple structure that eliminates the problems of the conventional ones described above.

Since the present invention is configured as described above,
When storing the bladder after completion of vulcanization, by opening the interior of the bladder to the atmosphere, the center post can be lowered by its own weight and stored and held within the lower ring.

Therefore, there is no need for a fluid pressure cylinder to lower the center post, and there is also no need for a seal between the center post and the lower ring, which simplifies the structure, making it economical and improving maintainability. can.

Hereinafter, one embodiment of the present invention will be described based on the drawings. The mechanical crank press, which vulcanizes tires using a rubber bag called a bladder, was developed in 1972.
This is publicly known as described in Japanese Patent No. 37518, etc., and in this example, only the main part will be explained.

1 is a beam, 2 is an upper hot plate fixed to the beam 1, 3 is a base, 4 is a lower hot plate fixed to the base, 5 is an upper mold attached to the upper hot plate 2, 6 is a lower hot plate The upper and lower molds 5 and 6 are pressurized to open or close using a mechanical crank mechanism (not shown).

Reference numeral 7 denotes a bladder, the upper center part of which is inserted into the upper recess of the center post 8 and clamped by a presser fitting 9 via a bolt 10, and the lower end is clamped between a lower ring 11 and an inner cylinder 15. has been done.

The lower ring 11 has a threaded hole at its lower end into which a threaded rod 12 is screwed, and the tightening force of the threaded rod 12 causes the lower end of the bladder 7 to be connected to the inner cylinder 15 via the upper flange 13 and tie rod 14. It is possible to hold the

Further, a heat medium is supplied into the bladder 7 from a hole provided in the lower ring 11, and presses the tire 16 to the inner surfaces of the upper and lower molds 5, 6 via the bladder 7, and applies heat to the tire 16. It is vulcanized and molded so that it can be discharged through a hole.

Reference numeral 17 denotes a cylindrical outer cylinder, the upper end of which is held between the lower hot plate 4 and the lower mold 6, and two fluid pressure cylinders 18 are attached to the lower end of the cylinder. The tip of the 18 piston rod 18a is screwed into the lower end of the inner cylinder 15.

Reference numeral 19 is a known tire ejecting chuck, and ram 2
The mechanism has a sector 19a that opens and closes by the vertical movement of 0.

A bearing 22 is fixed to the lower surface of the base 3 by a bolt 23, has a bush 21 on its inner surface, and rotatably supports a box 24 having a square hole at the upper end and a sprocket 24a at the lower end. A corner formed at the lower end of the threaded rod 12 is inserted into the square hole of the box 24.

Further, a flange portion is formed in the center portion of the threaded rod 12, and is loosely fitted between the upper flange 13 and the lower flange 25.
is tightened and held by a tie rod 14 and a nut 26.

The lower end of the center post 8 is housed and held in a vertically sealed pressure-resistant hole 11a provided in the lower ring 11 via a bush 28 so as to be vertically movable. There are holes for pressure balance that communicate with the

27 is a stopper for transmitting the downward pressing force acting on the inner cylinder 15 due to the pressure of the heat medium for vulcanization to the outer cylinder 17, and its outer periphery is loosely engaged with the inner periphery of the outer cylinder 17. The stopper 27 and the inner cylinder 15 are formed to have cross-sectional shapes as shown in FIGS. 2 and 3, respectively, by the rotational force applied to the bar 27a protruding from the lower end. It is fitted and removed by rotation of the stopper 27, and functions as a stopper and to allow the inner cylinder 15 to descend.

Next, the effect will be explained. Assuming that vulcanization is completed in the state shown in Figure 1, after discharging the heat medium through the hole,
The inside of the bladder 7 is opened to the atmosphere and the pressure is made equal to the atmospheric pressure.

After that, if the ram 20 is moved down, the chuck 1
The sector 19a at the lower end of 9 opens to support the tire and pushes down the center post 8 to open the bladder 7.
Peel it off from above the tire 16.

Then, the inner cylinder 15 is opened by the fluid pressure cylinder 18.
The bladder 7 is peeled off from below the tire 16 by slightly raising the cylinder 15, and the stopper 27 is rotated by a necessary angle via the bar 27a by a hydraulic cylinder (not shown), so that the inner cylinder 15 can be lowered. By lowering the inner cylinder 15 using the arrow 18, the bladder 7 can be drawn into and housed in the outer cylinder 17, and at this time, the center post 8 is lowered by its own weight.

When the press is opened and the vulcanized tire is taken out, the next green tire to be vulcanized is brought in, the inner cylinder 15 is raised by the fluid pressure cylinder 18, and the stopper 27 is rotated to the position where it acts as a stopper. After that, the inner cylinder 15 is lowered and is seated on the upper surface of the stopper 27. Subsequently, a heat medium is supplied into the bladder 7, the bladder 7 is inserted into the tire, and the next vulcanization process is started.

The center post 8 is raised by supplying a heat medium into the bladder 7, and when the center post 8 is raised or lowered, the pressure between the inside of the bladder 7 and the inside of the hole 11a of the lower ring 11 is reduced through the holes T and J. A balance is made.

As described above, since the center post 8 is lowered by its own weight, there is no need for a fluid pressure cylinder to lower the center post, and the center post 8 is housed and held in the hole 11a of the lower ring 11. This eliminates the need for sealing gaskets for the heat medium, making the structure simple, economical, and easy to maintain. It is possible to achieve the following effects.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view taken along line E in FIG. 1, and FIG. 3 is a sectional view taken along line II in FIG. 7: Bladder, 8: Center post, 11: Lower ring, 11a: Hole, 17: Outer cylinder, 28: Button.

Claims (1)

[Claims] 1. In a tire vulcanizer in which the bladder is lowered and retracted into the outer cylinder after tire vulcanization is completed, the center post that holds the upper center part of the bladder is replaced with the lower part that holds the lower end of the bladder. A tire vulcanizer is characterized in that the tire vulcanizer is housed and held in a hole of a sealed pressure-resistant structure formed integrally with the inside of a ring so as to be able to move up and down and be lowered by its own weight.